Process for preparing potash magnesium sulphate fertilizer with kalium containing sulfate

Abstract

The invention provides a method for preparing a potash magnesium sulphate fertilizer by utilizing potassium-bearing sulfate mineral, which takes the potassium-bearing sulfate mineral obtained by solarization of sulphate type salt lake potassium-containing brine water as a raw material to prepare potash magnesium sulphate fertilizer products in accordance with national potash magnesium sulphate fertilizer product standard, through processes such as crushing, grinding ore, decomposing and converting, floatation and separation, secondary pulp washing and so on. The method utilizes decomposing mother liquor and secondary pulp washing liquid to decompose raw material ores, the circulating utilization ratio of the decomposing mother liquor is more than or equal to 80 percent, and the circulating utilization ratio of the secondary pulp washing liquid reaches 100 percent, thereby improving yield of potassium, reducing water amount for decomposition and reducing the water consumption of ton-product by 30 to 70 percent compared with other methods for producing the potash magnesium sulphate fertilizer. The whole production process is carried out at normal temperature and pressure, which reduces energy consumption; and the quality of the potash magnesium sulphate fertilizer products meets or exceeds national standard (GB / T20937-2007) for potash magnesium sulphate fertilizer qualified products.

Description

technical field [0001] The invention belongs to the technical field of brine chemical industry, and relates to a preparation method of potassium magnesium sulfate fertilizer, in particular to a kind of potassium-containing sulfate ore obtained by solar evaporation of sulfate-type salt lake potassium-containing brine and salt field as raw material, through crushing, grinding, A method for producing potassium magnesium sulfate fertilizer through processes such as decomposition conversion, flotation, repulp washing and the like. Background technique [0002] The chemical formula of potassium magnesium sulfate fertilizer: K 2 SO 4 · MgSO 4 ·6H 2 O is an inorganic green fertilizer rich in K, Mg, and S. The ratio between the three is very stable. Its important character is good solubility (100% water-soluble). When the soil nutrients are lacking, it can provide Part of potassium and all of sulfur and magnesium nutrients; another important feature of potassium and magnesium sul...

AI Technical Summary

Problems solved by technology

Until the end of the 20th century, there has been no major breakthrough in the technology of separating and extracting potassium sulfate and magnesium fertilizer from the potassium sulfate mixed salt minerals obtained by evaporation of salt fields.

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