Experimental Flotation Liu Changmiao Gansu Luo et Gap apatite type low-grade phosphate rock, the results showed that oxidized paraffin collector soap, sodium carbonate, sodium silicate, and agents for the adjustment, can be effectively enriched ore phosphorus Gray stone. When the mineral mass fraction of the ore fluoroapatite is 7.02%, the direct flotation process using a coarse two-sweeping four-precision and medium-mine sequence return can yield a yield of 7.78%, containing P2O5 of 29.04%, and containing MgO. 1.89%, a recovery rate of 76.56% of apatite concentrate. After the magnesium is reduced by sodium humate, qualified apatite concentrate can be obtained. The ore deposit of a certain phosphate rock in Yunnan contains P2O525.41%, Zhang Xu, Wang Yajing, etc. The flotation test was carried out on the mine. Using a rough flotation and a fine positive flotation process, a flotation index of 30.62% of the P2O5 grade of the phosphate concentrate and a recovery rate of 83.87% was obtained. The high siliceous phosphate rock in this study is symbiotic with gangue minerals or is surrounded by gangue minerals, making flotation difficult. Recycling useful elements in low-grade ores has far-reaching implications for resource use. Li Ruolan et al. studied the siliceous phosphate rock in a certain area of ​​Australia. According to the characteristics of siliceous phosphate rock, after the ore property analysis, the preliminary flotation process was used for the rough selection process. . The results show that the fineness of grinding is -0.038 mm, the mass fraction is 95.18%, the amount of sodium carbonate is 2.0 kg/t, the amount of water glass is 2.5 kg/t, the amount of pulp dispersant L3 is 1.6 kg/t, and the dosage of collector is 3.0kg. Under the condition of /t, the addition method of sodium carbonate and water glass is added to the ball mill at the same time. After the closed-circuit test process, the grade P2O5 of concentrate is 30.06%, the mass fraction of SiO2 is I6.47%, and the recovery rate is 85.08%. Phosphate concentrate. (2) Single reverse flotation process Jiang Zhensheng and others carried out a joint process test of “reverse flotation-middle mine re-grinding†for a phosphate mine in Guizhou. The P2O5 grade of raw ore was 23.52%, and the mass fraction of MgO was 7.14%. One rough selection and one sweeping reverse flotation process were adopted respectively. A closed-circuit comparison test was carried out with a rough selection and a sweeping ore re-floating process. The results show that the concentrate regrind process increases the concentrate yield by 59.32% when the P2O5 grade and the MgO mass fraction of the concentrate are close. By 61.22%, the concentrate recovery rate increased from 90.19% to 93.61%, and the tailings P2O5 grade decreased from 5.27% to 3.65%. It can be seen that under the premise of ensuring the quality of concentrate products, the medium-mine re-grinding process can effectively improve the recovery rate of concentrates and has better economic benefits. According to the ore properties of Yunnan weathered colloidal phosphate rock, Zhong Jin used the SLR sweeping test procedure and adopted the self-developed ZP series of chemicals (cation collector). The dosage of this agent is small, which can greatly reduce the general phosphate rock. Flotation of the cost of the agent and achieved a good effect of the concentrate grade P2O5>31%, achieving effective separation of useful minerals and gangue, and obtaining qualified phosphate concentrate products. Li Ruolan et al. carried out a flotation process on a low-grade (P2O5 grade l5.44%) carbonate-type collophanite in the Yunyunsi area of ​​Yunnan. The test results showed that the appropriate grinding fineness and correct chemical addition method were selected. And using the new medicament WP, using a rough selection and a selective reverse flotation process, a phosphate concentrate with an average P2O5 grade of 30.73% and a recovery rate of 68.65% can be obtained. Zhang Lingyan and others are aiming at the Yichang fine-grained easy-to-mud, low-grade and difficult-to-select colloidal phosphate ore, using a single reverse flotation process of slurry flotation, adjusting the pH value with sulfur-phosphorus mixed acid, inhibiting the phosphate rock, and adopting modified fatty acid to collect. The agent HS captures carbonate, and obtains the excellent index of the final phosphorus concentrate P2O5 grade of 29.45%, MgO mass fraction of 1.28%, and recovery rate of 75.38%, and realizes the normal temperature flotation of dolomite, calcite and collophanite. Separation. Li et flag grade phosphate was added to the self ZHIJIN collector (WF-02) were studied reverse flotation, the use of collector added stagewise manner investigated collector dosage, the amount of inhibitors, fine grinding The effect of degree, slurry concentration and flotation time on P2O5 grade and recovery. The test results show that the amount of WF-02 is 1.0 kg/t ore, the amount of phosphoric acid is 10 kg/t ore, the mass fraction of pulp is 35%, the fineness of grinding-0.074 mm is 89%, and the flotation time is 9 min. Under the conditions, the P2O5 grade of phosphate concentrate can be increased from 21.90% to 33.19% of the original ore, and the recovery rate reaches 89.89%, and a good flotation effect is obtained. In order to reduce the mass fraction of magnesium oxide in the low-grade phosphate rock of Huize high-magnesium in Yunnan and improve the grade of P2O5, Zhou Jun used a single reverse flotation process with full sulfuric acid and one sweep to treat low-grade phosphorus in high-magnesium in Yunnan Huize. The mine was tested. In the condition that the ore P2O5 grade is 23.71%, the best grinding fineness is -0.074 mm, and the mass fraction is 88.2%, sulfuric acid is used as the pH adjuster and inhibitor (no need to add other inhibitors such as phosphoric acid) to modify The cottonseed oil fatty acid soap is a collector and is subjected to a flotation test. The results showed that: the amount of sulfuric acid used in the rough selection was 10 kg/t, the amount of sulfuric acid used in the sweeping was 6 kg/t, the collector TSM-2 was used in several stages, and the first section was added 1.2 kg/t. At 0.3 kg/t, the P2O5 grade of the concentrate is 3O.O9%, the recovery rate is 86.53%, the magnesium oxide is reduced from 4.55% of the ore to 0.78% of the concentrate, and the magnesium removal rate is 88.13%. It opened up a new way for the utilization of Yunnan Huize Phosphate Mine. ( 3) Positive and negative (anyway) flotation process In view of a low-grade refractory silicon-calcium phosphate rock mine in Hubei, Yu Jun et al. conducted a pilot study on the positive and negative flotation process. The positive flotation preferential drug system is: Na2CO3 dosage 4.2 kg/t, Na2SiO3 dosage 1.0 kg/t, DK-1 dosage is 1.0 kg/t, DC-1 dosage is 0.3 kg/t; reverse flotation preferential drug system is: sulfuric acid dosage 25.0 kg/t, DC-2 dosage 0.5 kg/t, when raw ore P2O5 grade is 11.11%, The mass fraction of MgO is 7.11%, and the P2O5 grade of phosphorus concentrate is 29.10%, the mass fraction of MgO is 1.15%, and the recovery rate of P2O5 of concentrate is 83.08%. The goal of comprehensive utilization of low-grade colloidal phosphate is achieved. Gao Huimin et al. determined the positive and negative flotation process of low-grade colloidal phosphate rock in Yuan'an. Through positive and negative flotation, when the P2O5 grade of raw ore is 17.96% and the mass fraction of MgO is 2.31%, the concentrate P2O5 31.21% and MgO 0.84% ​​can be obtained. Good indicators have achieved effective separation of colloidal phosphate and other impurity minerals such as quartz and dolomite. The use of sodium dodecyl sulfate (SDS) as a synergist can greatly improve the collection performance and selectivity of the collector, and improve the P2O5 grade and recovery rate. Baizhong can use the positive and negative flotation process and high-efficiency flotation reagents to carry out small-scale test, expansion test and industrial test three stages of flotation experiment development for Haikou medium-grade silicic calcium phosphate rock, and achieved satisfactory economy. Technical and environmental indicators. The success of this industrialization development provides engineering construction basis and technical parameters for the construction of low-grade phosphate rock flotation plant in Haikou Phosphorus Mine. A phosphate mine in Yunnan contains 23.97% P2O5, 23.64% SiO2, and CaO 31.78%. Mao Surong passed the positive and negative flotation tests, and obtained the phosphorus concentrate grade of 31.74%, the recovery rate of 81.47%, and the concentrate containing 11.32% of SiO2. In order to rationally develop and utilize the low-grade phosphate rock resources of Dongsheng Temple in Inner Mongolia, Li Yan et al. conducted a systematic beneficiation test on the refractory phosphate rock for its ore nature and occurrence. Through the positive and negative flotation process, the final closed-circuit test indicators are: grinding fineness -0.074mm mass fraction accounted for 89.50%, raw ore grade P2O5 7.30%, MgO 5.42%, concentrate grade P2O5 32.37%, MgO 1.10%, The recovery rate is 84.73%. S711 is one of the commonly used inhibitors of colloidal phosphate flotation. Li Fang et al. introduced the test results of the positive and negative flotation process of the Fangmashan phosphate mine without S711. The results show that the positive and negative flotation can achieve the same concentrate quality and concentrate as the S711 without using the inhibitor S711. Recovery rate, and economic indicators are better than the flotation results when using S711. Fu Kewen et al. used the direct flotation method to select the Dajiakou gel-collected phosphate rock. There is a problem that the concentrate foam has high viscosity, the foam is not easy to be broken, the concentrate is difficult to settle, and the MgO mass fraction in the concentrate is high, and the concentrate slurry cannot meet the requirements. Production of superior grade diammonium phosphate (DAP) requirements. Therefore, on the basis of laboratory tests, the new SP agent was selected as the phosphorus mineral inhibitor, and the new direct flotation process was carried out by the new process of “priority desiliconization-coarse concentrate demagnesizationâ€. Transformation and industrialization experiments. The results show that when the P2O5 grade of raw ore is 17.9O% and the mass fraction of MgO is 4.28%, the index of concentrate P2O5 31.62%, MgO 0.74% and recovery rate 81.35% can be obtained. Deng Wei and others are aiming at the characteristics of Qingping Phosphate ore. According to local conditions, “no need to warm the slurryâ€, “no need to add carbonate inhibitors for positive flotationâ€, “no need to add phosphoric acid for reverse flotationâ€, “no need to add carbonic acid for reverse flotation†The "four no" positive and negative flotation process of the salt collector. Under the condition of 22.22% P2O5 grade, 2.91% of MgO mass fraction and 93% of milled fineness -300 mesh, the 1 t/d expansion continuity test of continuous operation for 72 h can obtain P3O5 30.37% and MgO 0.53%. The process index of concentrate yield 60.71% and recovery rate 82.99%. Huang Qimao and so on, for the ore properties of a medium-low grade siliceous calcium phosphate rock in Hubei, using the normal temperature flotation process, through the optimization of the flotation process of the pharmaceutical system, obtained a good selection index: the original P2O5 grade 17.09%, MgO The mass fraction is 5.29%, the P2O5 grade of phosphate concentrate is 29.03%, the recovery rate is 78.22%, and the mass fraction of MgO is 0.71%, which provides a reference for the development and utilization of the medium and low grade siliceous calcium phosphate rock. ( 4 ) Double reverse flotation process Liu Xingqiang et al. conducted a pilot study on a medium-low grade siliceous calcium phosphate rock using a double reverse flotation process. For phosphorus minerals, both carbonate and silicate are impurity minerals. Salt (magnesium selection) or silicate (selected silicon) was first tested in two processes. The results show that the separation process after the first selection of silicon is not as good as the first selection of magnesium, and silicon is selected. Part of the foam is more viscous, and the amount of float on the magnesium part is obviously reduced. Even if the amount of the collector PA-64 is increased, the amount of floating is still insufficient, and even the latter is not mined. Therefore, the double reverse process of selecting the silicon after the first selection of magnesium is finally determined. The optimal closed-circuit test results show that the double-reverse of the silicate is selected after the first carbonate is selected, the P2O5 grade is 23.14%, the MgO mass fraction is 3.72%, and the grinding fineness is -200 mesh 76.55%. In the flotation process, a high-quality phosphate concentrate with a P2O5 grade of 30.60% and a MgO mass fraction of 0.68% can be obtained, and the recovery rate of the concentrate P2O5 is 81.05%. Cheng Renju et al. aimed at the ore properties of a medium and low grade phosphate rock in Guizhou. Under the condition of grinding fineness -74 μm mass fraction accounted for 80%, EM-LS-01 was used as anti-float magnesium collector, modified amine. The collector EM-FM-01 was used as the anti-float collector, and the double reverse flotation process was used. Finally, the P2O5 grade was 31.26%, the recovery rate was 81.15%, and the phosphorus concentrate containing MgO 0.86% was realized. Effective separation of phosphorus minerals from gangue minerals. Xie Chunmei et al. used the double-reverse flotation process to study the main factors affecting the sorting index, and used the double-reverse flotation process as the research object. The results show that under the condition of grinding fineness -0.074 mm mass fraction accounted for 80.80%, the silicate calcareous phosphate rock with P2O5 grade of 25.05% is selected by "one rough selection and one sweep twice selection" flotation process. After that, a comprehensive concentrate with a P2O5 grade of 31.82%, a MgO mass fraction of 0.92%, and a SiO2 mass fraction of 12.63% can be obtained, and the total recovery is 80.24%. ( 5 ) Comparative study of flotation process Shen Jing et al. conducted a single reverse flotation, double reverse flotation and normal temperature positive and negative flotation process research and drug cost comparison for a medium-low grade calcium siliceous phosphate rock in Hubei. The results show that: using a single reverse flotation, we can get Phosphate concentrate P2O530.37%, MgO 0.36%, the recovery rate of 88.38% is a good indicator, and the most economical, the cost per ton of raw ore is only 15.28 yuan; if the quality of the concentrate is better, the recovery rate is higher, it is recommended Using double reverse flotation, a good index of phosphorus concentrate P2O531.60%, MgO 0.43%, and recovery rate of 90.63% can be obtained, and the cost per ton of raw ore is 23.40 yuan; the quality of concentrate is relatively high in positive and negative flotation. The rate is lower, the cost of chemicals is higher, and the fineness of grinding is fine. The indexes are P2O530.54% for phosphorus concentrate, 0.70% for MgO, and the recovery rate is 84.62%. The cost of raw ore for each ton is 26.98 yuan. According to the nature of the ore, Fang Shixiang and others used the three processes of single reverse flotation, double reverse flotation and positive and negative flotation to select Yunnan Huize Phosphate Mine. The results show that all the three processes can achieve better beneficiation index, which opens up a new way for the development of Yunnan Huize Phosphate Mine. Luo Huihua and Bai Zhongneng believe that a single reverse flotation process can obtain better beneficiation index, but it is limited to the treatment of phosphate rock with higher carbonate minerals; the double reverse flotation process requires that the mass fraction of SiO2 in phosphate rock cannot be Too high; single re-election process concentrate recovery rate is low, and the impurity MgO mass fraction is high, the concentrate grade does not meet the requirements of acid phosphate rock. Based on the analysis of the occurrence and embedding characteristics of Haikou Phosphorite, it is proposed to use the positive and negative flotation process to treat the high-magnesium and high-magnesium phosphate rock in Haikou, and to treat the low silicon high in Haikou by single or double reverse flotation process. The beneficiation process plan of magnesium phosphate rock. ( 6 ) Other flotation process research Li Gen et al. studied the effect of particle size and its distribution on the flotation of Jinning phosphate rock, and proposed and tested a method to solve the interaction between coarse and fine particles—graded flotation. Tests have shown that grading flotation can reduce the consumption of flotation reagents, increase the flotation index, and reduce the fineness of grinding. Liu Lifen pointed out that the high-silicon low-grade sandy phosphate rock fine-grained ore has a low mass fraction of useful minerals and a high mass fraction of sesquioxide. The direct flotation slurry is sticky, and the useful minerals and impurities are difficult to separate. The flotation process avoids the interference of fine-grained grade ore on flotation operation and obtains ideal technical indicators. Qian Bulin and others have developed a branch flotation process for silicic calcium phosphate rock. The post-grinding silicic calcium phosphate rock is first subjected to reverse flotation demagnesium, and the reverse flotation coarse concentrate is classified. The stage part is subjected to reverse flotation desiliconization, the fine fraction is subjected to positive flotation desiliconization, and the desiliconized concentrate is combined into a final concentrate. The process fully takes into account the characteristics of the silicic calcium phosphate rock and the sorting characteristics of the coarse and fine grain grades, and has the advantages of high sorting efficiency, excellent process index, and low overall cost of the final concentrate. Cao Xiaoquan et al. introduced a flotation process for siliceous calcium phosphate rock: firstly, the ore after grinding is subjected to positive flotation to eliminate siliceous minerals, carbonate minerals, mud and other minerals with poor floatability. The crude concentrate is subjected to reverse flotation of carbonate minerals to float carbonate minerals. Finally, the products in the tank are desilted and floated to further remove impurity minerals such as silicon, iron and aluminum . The flotation process results in a higher grade phosphate concentrate. Qian Bolin and others have developed a floatable sorting process such as silicic calcium phosphate rock. The silicic calcium phosphate rock after grinding is first floated and floated, and the foam product is subjected to reverse flotation to remove magnesium. The inner product undergoes positive flotation desiliconization, and the magnesium concentrate and desiliconized concentrate are combined into a final concentrate. The process makes full use of the difference of the natural floatability of each mineral, and has the advantages of small flotation agent dosage, high sorting efficiency, high final concentrate quality and low comprehensive cost. A low-grade colloidal phosphate rock in Yichang, Hubei Province, the apatite particles are finer, the carbonaceous and carbonate mass fractions are higher, and the apatite and gangue minerals are embedded or inclusions. Yu Song Han nature of the ore and the like employed for anti anyway flotation, reverse flotation oil to coal desliming other carbonaceous, and then mixed acid of sulfuric and phosphoric acids as an anti-floating agent and the inhibitor other adjustment carbonate, The modified fatty acid HQ is a collector anti-floating carbonate, and finally the water-glass inhibits the silicate, the carboxymethyl cellulose-based inhibitor S-2 inhibits the carbonate, and the fatty acid soap S-1 floats and collects the phosphorus. Gray stone, the final phosphorus concentrate contains P2O531.36%, MgO 0.95%. ( 7 ) Research on other flotation technologies Yunnan phosphate rock resources are abundant. According to the nature of the ore, it is possible to adopt alkali or alkali-free process during positive flotation. Liu Lifen studied the adaptability of alkali and alkali-free processes to different types of phosphate rock in flotation, and summarized the advantages and disadvantages of alkali and alkali-free processes. The study found that: silicic calcium phosphate rock is more suitable to use alkali-free process, calcium siliceous phosphate rock is suitable for both processes, but adding a small amount of sodium carbonate as a pH adjuster, the effect is more ideal. The siliceous phosphate rock is preferably used in an alkali process. Determination of alkali or alkali-free processes based on the nature of the ore is of great significance for achieving better production targets, saving chemicals, and simplifying process flows. The addition point of the drug also has an impact on the production index. A siliceous calcium phosphate ore in the Haikou mining area in Yunnan contains 522.56% P2O. In the reverse flotation, the production index is not ideal when the concentrated sulfuric acid and the collector YP-3 are added at the same time. Yang Wenquan et al. studied the effect of concentrated sulfuric acid addition point on the reverse flotation of phosphate rock. When the concentrated sulfuric acid and the collector were not added, the F2O5 grade of reverse flotation concentrate was 31.65%, and the recovery rate was 93.86%. Compared with the simultaneous addition, the grade is 0.98 percentage points higher and the recovery rate is 11.43 percentage points higher. When the phosphate rock is reversely floated under different dosing time, the index does not change much. The study indicated that concentrated sulfuric acid and collector should be added separately. Bai Zhongneng, etc., for the problem of large consumption and poor harvesting effect of a certain phosphorus plant, the plant's collector was optimized and adjusted, and the current use quality of the collector was adjusted from 10% to 5%. The sexual administration is adjusted to multi-point dosing, and the dosage of the drug is reduced, thereby achieving the purpose of cost saving. Yang Wenquan, Luo Lianming, etc. often have the problem of “short circuit†in the production process of two 2 million t/a flotation plants in Haikou and Anning, Yunnan, and analyzed the process characteristics of the original only water glass as inhibitors and modifiers. The main reason for the occurrence of "short circuit" is that the water glass acts as an inhibitor and the regulator is weak, resulting in insufficient flotation time in the process. In the study, it was found that sodium carbonate as an inorganic regulator can reduce the inevitable ions such as Ca2+ and Mg2+ in the slurry, activate the phosphate rock, accelerate the flotation speed and shorten the flotation time. They analyzed the mechanism of action of water glass, water glass and sodium carbonate and carried out a comparative test with and without sodium carbonate. The results showed that the concentrate yield and recovery of the sodium carbonate flotation process were the same during the same foaming time. The rate is 11.45% and 16.69%, indicating that the activation of sodium carbonate in the positive flotation of the phosphate rock is very obvious. The test results have been used in the production practice of Haikou Flotation Plant and have achieved good economic benefits. On the basis of the double reverse flotation process, Li Songqing conducted a grinding fineness condition test on a sedimentary silicic calcium phosphate rock with de-magnesium and silicon-reducing, and the acidity and grinding fineness was -0.074 mm. Under the condition of %, BK422 is the reverse flotation demagnetization collector, and BK430 is the reverse flotation desiliconization collector. The MgO grade is 1.08%, the SiO2 grade is 12.79%, the P2O5 grade is 30.39%, and the P2O5 recovery rate is 92.70. % of the phosphate concentrate has achieved good test results. Zhou Ying et al. conducted experiments on flotation and enrichment of phosphorus by using steel balls and steel rods as grinding medium and “one coarse and one fine†reverse flotation process for the medium and low grade phosphate rock in Guizhou Zhijin. The results show that: When the fineness of grinding -0.074 mm is 75.00%, the obtained phosphate concentrate contains 33.45% P2O5, 1.28% MgO, and the recovery rate of concentrate P2O5 is 89.26%. The P2O5 grade of the phosphate concentrate obtained by the rod grinding method is 1.15 percentage points higher than the P2O5 grade obtained by the ball milling method, and the MgO grade is 0.76 percentage points lower. Mulu studied the influence of the three-phase foam stability of the phosphate rock concentrate on the three-phase foam system of the phosphate rock ore concentrate. Studies have shown that the three-phase foam produced by sodium oleate as a collector is the most stable compared with oxidized paraffin soap and tar oil; -0.01 mm granules of solid phosphate granules significantly improve the stability of three-phase foam, and The 0.01~0.038 mm particle size has little effect on the stability of the three-phase foam, and the 0.038-0.076 mm particle size reduces the stability of the three-phase foam. Yang Wenquan et al. calculated the theoretical maximum recovery of phosphate rock by measuring the monomer dissociation degree of colloidal phosphate in different grinding fineness, and then judged the advantages and disadvantages of flotation index by comparing the actual recovery rate with the theoretical maximum recovery rate. . Using polarized light microscopy, using the ruler line method, the useful minerals (phosphorus phosphate) in the phosphate rock were determined under the conditions of 80.23%, 88.71%, 92.74% and 95.16% of the grinding fineness -0.074 mm, respectively. Monolithic dissociation of minerals and gangue minerals (dolomite, quartz). Based on this calculation, the theoretical maximum recovery rates of the corresponding fineness of the colloidal phosphate rock were obtained, which were 95.11%, 95.71%, 96.70% and 96.72%, respectively. The preliminary flotation test showed that the grinding fineness was suitable at -0.074 mm, accounting for 88.71%. The flotation rate was 88.76%, and the actual recovery rate of phosphate concentrate was 87.54%. Under this fineness of grinding, the actual recovery rate of flotation phosphorus concentrate can reach 91.24% by optimizing flotation process and chemical system, and the recovery rate of phosphate mineral in concentrate can reach 95.33%, indicating that the determination of colloidal phosphorus It is feasible to optimize the index by the monomer dissociation of the ore. Kang Tuoxin et al. summarized the production practice of the phosphorus selection process of the Fenenggou iron-phosphorus ore flotation process in Fengning, Hebei Province for 7 years. The properties of the original ore, flotation granularity, concentration, flotation foam layer dynamics, flotation machine aeration, float Factors such as temperature selection and flotation water quality were discussed and studied separately to find out the factors affecting the flotation process and provide basis for the production of the concentrator. The pH of the slurry solution is one of the important factors affecting the flotation index. Wang Canxia studied the effect of pH on the desiliconization of a medium-low grade siliceous phosphate rock in Yunnan under the condition of a certain amount of amine collector. The test results show that the pH range of the amine-based anti-flotation desiliconization is 7.0-8.5.
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　　 ( 1 ) Direct flotation process