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Method for preparing potash magnesium sulphate fertilizer from potassium-containing solid mine by separation and extraction

A technology of potassium magnesium sulfate fertilizer and magnesium sulfate, which is applied in the field of salt chemical industry, can solve the problem of no major breakthrough in the separation and extraction of potassium magnesium sulfate fertilizer, and achieve the effects of low cost, high yield and saving salt lake resources

Inactive Publication Date: 2009-04-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 potassium sulfate and magnesium fertilizer from the potassium sulfate mixed salt minerals obtained by evaporation of salt fields.

Method used

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  • Method for preparing potash magnesium sulphate fertilizer from potassium-containing solid mine by separation and extraction

Examples

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Effect test

Embodiment 1

[0022] ①Set the chemical composition system as Jinzuomei Na, K, Mg∥Cl, SO4-H2O 15°C or 25°C Metastable Phase Diagram Magnesium Sulfate Phase Zone The potassium-containing sulfate-type salt lake brine evaporates in the sun until the brine is saturated with potassium, solid-liquid Separation: After separation, the potassium-saturated brine is evaporated until it is saturated with magnesium chloride, and the solid and liquid are separated to obtain raw material solid ore (potassium-sulfur mixed salt ore) and magnesium chloride just-saturated brine. The K of the obtained potassium-sulfur mixed salt ore is more than 5%; the concentration of the magnesium chloride brine is 7.5-8.5%.

[0023] ②The sulfate-containing carnallite ore (K≥5%), magnesium chloride just saturated brine (brine obtained in an unsaturated state after dilution by rainwater), water according to (1~5):(5~1):(0.1~ 2) Mixed ore in the weight ratio; stir and leach the mixed ore at 10-50°C for 20-90 minutes, separate ...

Embodiment 2

[0029] ① The system point of chemical composition is Jinzuomei Na, K, Mg∥Cl, SO4-H2O 15°C or 25°C metastable phase diagram, the potassium-containing sulfate type salt lake brine in the soft potassium-magnesium-vanadium phase region evaporates in the sun until the brine is saturated with potassium, solid Liquid separation; after separation, the potassium-saturated brine is evaporated to be saturated with magnesium chloride, and the solid-liquid separation is carried out to obtain raw material solid ore (potassium-sulfur mixed salt ore) and magnesium chloride just-saturated brine. The K of the obtained potassium-sulfur mixed salt ore is more than 5%; the concentration of the magnesium chloride brine is 7.5-8.5%.

[0030] ②The obtained potassium-containing sulfate minerals, magnesium chloride saturated brine (or unsaturated brine after rainwater dilution), and water are prepared according to the weight ratio of (1~5):(5~1):(0.1~2) Mix the ore, and then stir the mixed ore at 10-50...

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Abstract

The invention provides a method for utilizing potassic solid ore to separate and extract potash magnesium sulphate fertilizer. The method comprises the following steps: potassic sulphate ore and magnesium chloride saturated brine which are obtained through solarizing and evaporating a brine saltern in a potassic sulphate type saline are used as raw materials; potassium in the potassic sulphate ore is salted out and leached through the magnesium chloride saturated brine to obtain a saturated potassium solution; the saturated potassium solution is added with the brine saltern and is evaporated to prepare low-sodium magnesium sulfate and carnallite mixed ore; and the low-sodium magnesium sulfate and the carnallite mixed ore are decomposed and transformed to obtain the potash magnesium sulphate fertilizer. The potash magnesium sulphate fertilizer prepared through the method meets the national GB / T20937-2002 standard for a qualified product; and the yield of potassium is more than or equal to 60 percent. The method is suitable for processing the potassic sulphate type saline brine or the chloride type brine saltern ore with low yield of carnallite prepared through the addition of halogen, as the concentration of the potassic saturated brine potassium obtained through evaporating the brine saltern of the potassic sulphate type saline can not be ensured by the influence of rainfall amount, and magnesium chloride is unsaturated or has unhigh concentration due to that ,the magnesium chloride saturated brine is influenced by the factor of rainfall .

Description

technical field [0001] The invention belongs to the technical field of salt chemical industry and relates to an inorganic salt phase chemical separation technology, in particular to a potassium-containing sulfate mineral mixed ore, just saturated or low-concentration magnesium chloride brine obtained by sun-drying and evaporating the potassium-containing brine of a magnesium sulfate subtype salt lake It is a method of preparing potassium and magnesium sulfate fertilizer by salting out, leaching, filtering, separating, decomposing and transforming as raw material. 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 ...

Claims

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Application Information

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IPC IPC(8): C05D1/02
Inventor 李海民杨海云陈育刚张全有孟瑞英
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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