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Method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite

A carnallite and high-grade technology, which is applied in the fields of alkali metal halide purification, potassium fertilizer, application, etc., can solve the problems of low grade potassium chloride and achieve the goal of improving the grade of potassium chloride without changing the residence time and ensuring balance Effect

Pending Publication Date: 2022-01-21
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite for the problem that the grade of potassium chloride produced by fine-grained high-sodium carnallite is low in the prior art

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  • Method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite
  • Method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite

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Embodiment 1

[0033] In the present embodiment, sodium-containing carnallite is composed of KCl: 18.95%, NaCl: 19.44%, MgCl 2 : 26.59%, wherein the sodium chloride whose particle size is less than 0.25mm accounts for 77.48% of the total sodium chloride, and prepares MgCl in advance 2 The concentration is 50L of 21% decomposition solution;

[0034] A method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite, comprising the following steps:

[0035] Put the fine-grained high-sodium carnallite into the crystallizer decomposition area of ​​the crystallizer at 11.38Kg / h, and add the MgCl prepared in advance in the first 30 minutes 2 The concentration is 21% decomposition liquid. After the system is stable, use a peristaltic pump to extract 18L / h of mother liquor from the crystallizer overflow area of ​​the crystallizer to the mixer, and mix it with fresh water in the mixer to form MgCl 2 Concentration is 21% specific concentration decomposition li...

Embodiment 2

[0037] Sodium-containing carnallite composition in the present embodiment: KCl: 18.95%, NaCl: 19.44%, MgCl 2 : 26.59%, wherein the sodium chloride whose particle size is less than 0.25mm accounts for 77.48% of the total sodium chloride, and prepares MgCl in advance 2 The concentration is 50L of 23% decomposition solution;

[0038] A method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite, comprising the following steps:

[0039] Put the fine-grained high-sodium carnallite into the crystallizer decomposition area of ​​the crystallizer at 11.38Kg / h, and add the MgCl prepared in advance in the first 30 minutes 2 The concentration is 23% decomposition liquid. After the system is stable, use a peristaltic pump to extract 30L / h of mother liquor from the crystallizer overflow area of ​​the crystallizer to the mixer, and mix it with fresh water in the mixer to form MgCl 2Concentration is 23% specific concentration decomposition liquid...

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Abstract

The invention discloses a method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite, which comprises the steps of putting the fine-grained high-sodium carnallite into a crystallizer decomposition area, adding a prepared decomposition solution with a specific concentration into the crystallizer decomposition area in the early stage, after the system is stable, extracting mother liquor from a crystallizer overflow area of the crystallizer to a mixer, mixing the mother liquor with fresh water or decomposition liquid with lower concentration than the mother liquor in the mixer to form decomposition liquid with specific concentration, and conveying the decomposition liquid with specific concentration to the crystallizer decomposition area of the crystallizer to participate in a decomposition and crystallization process. The method provided by the invention can solve the problem of low grade of potassium chloride prepared from fine-grained high-sodium carnallite, and the grade of potassium chloride is improved by further increasing the concentration of the decomposition liquid.

Description

technical field [0001] The invention relates to the technical field of potassium chloride production, in particular to a method for producing high-grade agricultural potassium chloride from fine-grained high-sodium carnallite. Background technique [0002] Potassium chloride, as an important chemical product, has important applications in the fields of agriculture, food and medicine, especially as a potassium fertilizer, it has a very important position in the agricultural field. Carnallite (KCl MgCl 2 ·6H 2 O) As the main raw material for the production of potassium chloride, it is mainly stored in salt lakes in Qinghai, Tibet and other places in my country. In Qinghai area, carnallite is used as raw material, and reverse flotation-cold crystallization and cold crystallization-positive flotation processes have been realized. The annual production capacity is about 6 million tons. During the formation of carnallite in Yantian, sodium chloride will be precipitated in solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D1/02C01D3/14
CPCC05D1/02C01D3/14C01P2006/80
Inventor 张世春付振海唐海英贾国安李成宝李顺利唐永全李志伟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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