Process for preparing potash magnesium sulphate fertilizer with kalium containing sulfate

A technology of potassium magnesium sulfate fertilizer and sulfate mine, applied in the direction of magnesium fertilizer, potash fertilizer, application, etc., can solve the problem of no major breakthrough in the separation and extraction of potassium magnesium sulfate fertilizer, and achieve the goals of wide application range, reduced dosage, and guaranteed quality Effect

Inactive Publication Date: 2008-12-10
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

Until the end of the 20th century, there has been no major breakthrough in the technology of separating and extracting potas

Method used

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  • Process for preparing potash magnesium sulphate fertilizer with kalium containing sulfate

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Embodiment Construction

[0041] Below, the brine system points fall into Jinzuomei K, Mg, Na, Cl, SO 4 2- h 2 O five-element metastable system normal temperature phase diagram soft potassium magnesium vanadium phase zone sulfate-type salt lake potassium-containing brine salt field solar evaporation obtained potassium-containing sulfate ore as raw material, illustrating the process of the present invention to produce potassium magnesium sulfate fertilizer.

[0042] ①Preparation of potassium sulfate ore

[0043] Sulfate-type salt lakes, potassium-containing brines, and salt fields are evaporated in the sun to obtain a mixed ore containing soft potassium magnesium vanadium, potassium salt magnesium vanadium, potassium rock salt, and magnesium sulfate—potassium-containing sulfate ore (called sulfur mixed salt mine): the potassium-containing The sulfate-type salt lake brine is evaporated in the sun, and after sodium chloride is precipitated, the potassium-saturated brine is poured into the potassium-cont...

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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...

Claims

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Application Information

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IPC IPC(8): C05D1/02C05D5/00
Inventor 李海民陈育刚孟瑞英张全有杨海云
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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