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Wang Xiaojing used a potassium mixed salt ore to carry out a rough flotation coarse KC1. Through multiple sets of test data analysis, the selected crude KC1 quality and potassium yield data were obtained, which provided a theoretical basis for the high quality required crude KC1 production.
Zhang Zhihong et al. used the different adsorption capacities of carnallite and sodium chloride on special collectors to separate the carnallite and sodium chloride by flotation. The obtained low-sodium carnallite is hydrolyzed to obtain a solid phase potassium chloride and a decomposition mother liquid. The process is characterized by high product purity, high yield, good physical properties, strong adaptability to raw ore, and high grade of potassium chloride product.
Xie Bingjun et al. carried out potassium extraction research on salt field carnallite in a mining area of ​​Dalangtan by cold decomposition-positive flotation process, and investigated the potassium content of decomposition water, flotation time, collector amount, mother liquor reuse and concentrate washing. The effect of salt recovery and concentrate quality. The results show that the decomposition of water to mass of magnesium chloride, carnallite required to completely dissolve 110% of theory is appropriate. The amount of collector can be selected as (70+20) g/t, and the reuse of medium and mother liquor can make the recovery rate of potassium chloride reach 95.42%. After the concentrate washing treatment, the mass fraction of KC1 in the obtained product reached 93.56%, which meets the requirements of GB 6549-2011 agricultural potassium chloride superior product index. The optimized positive flotation process has a better target for the enrichment of the Dalangtan potash.
Xie Yulong et al discussed the factors affecting the crystal size of carnallite decomposition and potassium chloride crystallizing in the 1 million t/a potash production line, and gave the optimal process control conditions so that the product size of 70% potassium chloride is >0.2 mm. The design requirements are met, the moisture content of the wet product is reduced, and the drying cost is reduced.
Guo Suhong et al. used flotation method to recover potassium chloride products from a potash mine, and studied the flotation effect under different grinding particle size conditions. The test results showed that the dissociation particle size of KC1 in the potash mine was about 1.0 mm. A good flotation index was obtained under the condition of grinding fineness D95=1.0 mm. The test procedure was rough open circuit test and one rough selection of two open circuit tests. The final grade was 95.5% and the recovery rate was 88.12%. Selected concentrates. The product quality can reach the national high-quality potash product standard. It provides a reliable technical guarantee for the large-scale development and utilization of the potash mine.
Tan Xin and others used the new process of pretreatment-reverse flotation (one rough selection and one selection) to improve the purity of potassium chloride products of Qinghai Salt Lake Industry Group Co., Ltd. The results show that the new process can effectively remove the gypsum impurities in the potassium chloride product and significantly improve the grade of the potassium chloride product. The obtained high-quality potassium chloride product has a KCI of 98.25%, a recovery rate of 96.70%, a CaSO4 content of 0.40%, and a calcium sulfate removal rate of 83.24%.
Niu Guiran et al. studied the method of flotation decalcification in the process of producing potassium chloride from the Chaerhan Salt Lake water-harvesting brine in Qinghai. The experimental results show that the average calcium removal rate of the grading flotation method is 88.16%, which is close to the theory of ore. The calcium ion removal amount is 91.58%.
In order to remove the clay slime in the potassium mixed salt, Chen Xiaoqing et al. conducted a preliminary exploration on the reverse flotation desliming process, and investigated the effects of flotation agents and scrubbing on the desliming effect. The results show that the ore is washed twice, using 10 g / t of polymer X2 and 2.5 g / t of ethoxylated fatty amine C2, the removal rate of slime can reach 68.56%.
The flotation quality of the ore slurry has a certain influence on the flotation index. Cheng Huaide et al. studied the effect of different pulp mass fractions on the separation of sodium and potassium salts by single factor conditional experiments. The results showed that: pulp The change of mass fraction changes the grade of concentrate and tailings, thus affecting the potassium yield and sodium removal rate; the best flotation pulp quality fraction in the rough selection stage is 23%~25%, and the best flotation in the selection stage The pulp quality score is about 15%.
The traditional method for recovering potassium salt is mainly recovered by ion exchange method and crystallization-grinding-flotation process, but this method produces a large amount of fine-grain concentrate in the process of extracting potassium salt, the product is not easy to dry, and the production cost is high, which limits the salt lake potassium. The use of salt. Huang Liya and others use the coarse flotation method to recover the salt lake salt. The crystal potassium salt directly enters the flotation process without the need of grinding process to avoid the production of fine grain potassium salt products. During the study, a new potassium salt flotation inhibitor HY was used for the test. The optimal experimental conditions are: flotation slurry mass fraction of 50%, hexadecylamine dosage of 90 g/t, starch dosage of 300 g/t, and HY dosage of 15 g/t, which gives a grade of 32.97% and a recovery rate of 84.23%. Potassium chloride concentrate.
In order to solve the problem that the tailings salt and potassium water in the plain area can be treated by the dry mining method to produce potassium chloride in the plain area. Zhao Genqing proposed a new process for producing potassium chloride by cyclic evaporation-hot solution crystallization. Through theoretical analysis and practical experiments, the process route, control index and main equipment selection of potassium chloride produced by this method were studied, and the process equipment conditions for producing high-quality potassium chloride in the engineering stage were obtained. After field tests, high quality products have been produced. The law has now become the latest technology for the production of high quality potassium chloride at home and abroad.
Guo Tingfeng et al. found through the study on the beneficiation and processing technology of the new salt-bearing potassium deposit in the northern part of Lenghu Town, Qinghai Province. The low-grade sand-bearing carnallite ore deposits in the salt field are divided into the original brine in the sodium salt pond. Re-evaporation in the pool - several steps in the carnallite pool. The low-grade sand-containing carnallite process for preparing potassium chloride mainly includes cold decomposition-flotation method and 4# process method. The combination of the 4# process and the flotation process can effectively reduce the precipitation of Yantian Mine and reduce the cost.
Soft potassium magnesium strontium is a key intermediate in the production of potassium or potassium magnesium fertilizer. Cheng Huaide et al. used a sulphate-type salt lake brine in Xinjiang to pass the indoor multi-temperature dynamic evaporation test, using the brine summer mineral-potassium-sulfur mixed salt mine as raw material, adding water to decompose and transform to obtain coarse soft potassium magnesium strontium ore, and finally using reverse flotation The mixed salt mine was refined by sodium removal technology to obtain a high-grade soft potassium magnesium strontium ore concentrate containing 1.78% NaC1, and the total yield of potassium in the whole conversion and flotation was 64.75%.
Tan Xia et al. used the low-potassium and high-sulfur halistone mixed salt mine in the old brine pool of Yantai Salt Lake in Xitai, and the mother liquor and the salt crystal bischofite discharged from the potassium sulfate and magnesium fertilizer production workshop, using the halogen process—positive float Selecting the process of extracting potassium chloride-reverse flotation to extract low-sodium carnallite mixed salt, and conducting the conditional experiment on the main factors such as the size of the carnallite mixed salt mine, the amount of mother liquor, the decomposition time, and the interaction between the positive and negative flotation reagents. To verify the feasibility of the process and obtain the best experimental conditions; at the same time, the process of extracting potassium chloride by positive flotation was extracted by reverse flotation, and the feasibility of the process was verified.
Mao Hanyun introduced several domestic production methods of potassium nitrate. Through the comparison of process technology schemes, it is concluded that the multi-effect evaporation-vacuum crystallization process should be used to produce potassium nitrate in Xinjiang, and the process is introduced.
The carbonate-type salt lakes in the salt lakes of Tibet are widely distributed. The potassium-bearing minerals formed during the evaporation process are mainly potassium mirabilite and potassium chloride. Hu Zhaojun and others used alkaline carbonate-type salt lakes as research objects to develop new collectors. The flotation process is used to float high-grade potassium thenardite and potassium chloride from different potassium-containing ores. Based on the study of the conditions of the degree of separation, the amount of collector added, the ratio of solid to liquid, flotation time, rotation speed, aeration volume, and selected experiments, the optimal closed loop process conditions were established. The circulating material amount is calculated by a closed loop experiment to obtain parameters such as product grade and potassium ion yield. Experiments show that the flotation process is used to process the mineral system of potassium mirabilite, and the product with potassium mass fraction of 91% or more can be obtained. The yield of potassium can be as high as 98%.
The Laos Potash Mine is a subterranean buried type soluble solid potash deposit, the main components of which are carnallite and rock salt. Wang Guodong et al. used potassium salt mine decomposition-positive flotation process to prepare potassium chloride, and investigated the effects of dosage, flotation slurry mass fraction, flotation temperature on potassium recovery rate and potassium chloride grade. The optimum process conditions were as follows: the flotation slurry mass fraction was 30%, the dosage of the agent was 80 g/t, and the flotation temperature was normal temperature. The closed-circuit test was carried out at 40 °C. The potassium yield of the potassium salt ore flotation process was 88.39%, and the potassium chloride mass fraction after the repulp washing was greater than 96%. The potassium chloride grade reached the national standard.
Cai Ming et al. introduced a decomposition and classification technique for soluble soluble potassium salt mines in Laos. The “stirring-decomposing†process of potash ore commonly used at home and abroad is not applicable to the Laos potash mine. The “rotational decomposition grading†process has been developed through experiments, which solves the problem of the decomposition of the coarse-grained potassium salt mine and is successfully applied to production. .
Zhu Pengcheng studied the particle size distribution of the decomposed minerals in the potash mines in Laos, and proposed the process of “rotational decomposition-selective grading-column flotation†of potash mines. Through the pilot test and 72 h continuous assessment, the stability and feasibility of the rotary decomposition grading-flotation process of the potassium salt mine were proved.
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