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Method for preparing potassium mixed salt mine by using nitrate contained magnesium sulphate subtype bittern and potassium nitrate production

A technology of magnesium sulfate subtype and potassium mixed salt ore, which is applied in the field of producing potassium mixed salt ore and producing potassium nitrate by using magnesium sulfate subtype brine containing nitrate, which can solve the problems of high content and achieve high energy consumption and high process efficiency. The effect of shortened process and severe equipment corrosion

Inactive Publication Date: 2015-03-11
XINJIANG ANHUA MINING INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of magnesium sulfate subtype intergranular brine that can effectively solve the six-component system containing nitrate, conventional natural evaporation, Mg 2+ , SO 4 2- For the problem of too high content, Mg-containing 2+ , SO 4 2- The semi-finished product with lower content - the method of potassium mixed salt, and then use the potassium mixed salt to produce industrial grade potassium nitrate and by-product magnesium sulfate

Method used

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  • Method for preparing potassium mixed salt mine by using nitrate contained magnesium sulphate subtype bittern and potassium nitrate production
  • Method for preparing potassium mixed salt mine by using nitrate contained magnesium sulphate subtype bittern and potassium nitrate production
  • Method for preparing potassium mixed salt mine by using nitrate contained magnesium sulphate subtype bittern and potassium nitrate production

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Experimental program
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Effect test

Embodiment 1

[0036] ① Preparation of potassium mixed salt:

[0037] First-level desalination: Take 1000Kg of intercrystalline brine from Uzunbulak Salt Lake, put it in multiple plastic basins with a diameter of 50cm and a depth of 20cm, and naturally evaporate and concentrate in the laboratory until the liquid phase contains 1.27% potassium. The drum is separated by a 40cm three-legged centrifuge. The separated solid phase is called sodium chloride here, and the sodium chloride content reaches more than 95%, which fully meets the requirements for the use of industrial salt. The separated liquid phase is called sulfuric acid here. Sodium saturated brine, which continues to undergo natural evaporation concentration desalination.

[0038] Secondary desalination: put sodium sulfate saturated brine in multiple plastic basins with a diameter of 50cm and a depth of 20cm, and concentrate it by natural evaporation until the liquid phase contains 2.05% potassium, using a three-legged centrifuge with...

Embodiment 2

[0079] Embodiment 2: The difference with Embodiment 1 is only that in the process of Embodiment 1, the brine is mixed in the middle, the high-sulfur brine: the mass ratio of potassium-analyzed brine is 1:0.8, and this ratio is based on the high-sulfur brine in the present embodiment. The situation after analyzing the mass ratio of potassium bittern is that the ratio of 1:1.6 is carried out is as follows:

[0080] Brine blending: according to the mass ratio of high-sulfur brine: potassium analysis brine is 1:1.6, blending and mixing evenly, and at the same time, a small amount of sodium chloride and magnesium sulfate are precipitated instantly. The blending solution is called brine blending solution here, and then The bittern solution is placed in multiple plastic basins with a diameter of 50 cm and a depth of 20 cm. It is naturally evaporated and concentrated in the laboratory until the liquid phase contains 3.36% potassium. It is separated by a three-legged centrifuge with a d...

Embodiment 3

[0084]Embodiment three: the difference with embodiment one is only that, in the middle operation of embodiment one, the brine used in the preparation process of potassium analysis mother liquor is 2% potassium-containing 2%, and the bittern used in the preparation process of potassium analysis mother liquor is used in the present embodiment Potassium-containing situation after being 2.38% is as follows:

[0085] Preparation of bittern with potassium analysis brine: take the brine that evaporates naturally from the salt fields in the Uzunbulak Salt Lake area until the liquid phase contains 2.38% potassium, and put it in multiple plastic basins with a diameter of 47cm*35cm and a depth of 40cm. In the domestic Haier freezer, freeze at -8°C for 48 hours, and then use a three-legged centrifuge with a drum size of 40cm to separate. The separated solid phase is called ice nitric acid, which is mainly sulfuric acid decahydrate containing a small amount of sodium chloride. Sodium, the ...

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Abstract

The invention relates to a method for sun-curing of potassium mixed salt mine with a higher potassium nitrate content and for producing of potassium nitrate through processes of natural evaporation, brine removing and the like by using six-element system intercrystalline bittern containing ions such as Na<+>, K<+>, Mg<2+> / Cl<->, SO4<2-> and NO3<->. The method comprises the following steps: 1, allowing magnesium sulfate subtype intercrystalline bittern to be subjected to evaporation and concentration, separating effluent salt to obtain high-sulfur bittern; 2, doping the high-sulfur bittern and potassium separating bittern at the mass ratio of 1:(0.8-1.6) to obtain a brine removing mixed solution, evaporating to separate sodium chloride from magnesium sulphate so as to obtain potassium saturated bittern; 3, evaporating the potassium saturated bittern to separate out potassium mixed salt; adopting a flotation manner to purify the potassium mixed salt to remove impurities so as to obtain flotation foam which is subjected to thermal solution to obtain a hot solution A; cooling the hot solution A, performing solid-liquid separation to obtain potassium mixed salt mine with the content of potassium nitrate being 95 percent. The method requires no magnesium removing agent, adopts the flotation technology, and has the advantages of low energy consumption, low equipment investment, less equipment corrosion, high product quality, low cost and the like.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry, in particular to a + 、K + , Mg 2+ / Cl - , SO 4 2- , NO 3 - Plasma six-component system intercrystalline brine (that is, magnesium sulfate subtype salt lake intercrystalline brine containing nitrate, also known as nitrate-containing magnesium sulfate subtype brine or six-component system magnesium sulfate subtype intercrystalline brine containing nitrate) The method for producing potassium nitrate by sun-drying potassium mixed salt ore with high content of potassium nitrate through processes such as natural evaporation and brine mixing. Background technique [0002] Xinjiang is the only region in my country that has solid and liquid mineral resources containing potassium nitrate. The use of this resource to produce potassium nitrate is of great significance both from the perspective of local and national development. Potassium saltpeter ore and salt lake intercrystalline bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/02
Inventor 张晓飞张仲轩刘传福张占良杨顺隆朱青川金伟黄艳玲付晓燕省小英吴付英
Owner XINJIANG ANHUA MINING INVESTMENT
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