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Method for producing potassium chloride, sodium chloride and magnesium sheet from bittern extracted from carnallite mine

A carnallite, potassium chloride technology, applied in the directions of magnesium chloride, magnesium halide, alkali metal chloride, etc., can solve problems such as increasing costs, and achieve the effects of reducing consumption, high potassium yield, and reducing dosage

Active Publication Date: 2013-08-14
CHANGSHA DESIGN & RES INST OF CHEM IND MIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If solution mining with normal temperature and fresh water is used, since the solubility difference between potassium chloride and sodium chloride is not large at low temperature, a large amount of waste salt will also accumulate in the subsequent stage of potassium chloride production, and in order not to cause geological hazards, the waste salt needs to be backfill, adding substantial cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Decomposition of carnallite

[0032] After preheating the carnallite mine brine to 70°C, add the carnallite from step (3) into the carnallite stirring tank at a mass ratio of brine:carnallite of 1:0.2, in which the initial production Carnallite is the carnallite obtained by directly evaporating and concentrating brine from the well. After stirring for 25 minutes, it is sent to the thickener, and the upper part of the thickener material overflows to the decomposition mother liquor storage tank; the quality of the dense underflow solid material accounts for 40% of the total mass of the material , filter and separate, decompose the mother liquor, that is, the filtrate is sent to the evaporation and concentration process; the obtained potassium halite filter cake is carried out with the mother liquor of potassium chloride crystallization from step (4) according to the ratio of mother liquor: potassium halite filter cake mass ratio of 1:2 Washing, fresh water washing is ...

Embodiment 2

[0049] (1) Decomposition of carnallite

[0050] After preheating the carnallite mine brine to 72°C, add the carnallite from step (3) into the carnallite stirring tank at the ratio of brine:carnallite mass ratio of 1:0.25, wherein the initial production Carnallite is carnallite obtained by direct evaporation and concentration of well-mined brine. After stirring for 36 minutes, it is sent to the thickener, and the upper part of the thickener material overflows to the decomposition mother liquor storage tank; the quality of the dense underflow solid material accounts for 38% of the total material mass. , filter and separate, decompose the mother liquor, that is, the filtrate is sent to the evaporation and concentration process; the potassium chloride crystallization mother liquor from step (4) is used for the obtained potassium halite filter cake according to the ratio of mother liquor: potassium halite filter cake mass ratio of 1: 2.5. Washing, wherein fresh water washing is use...

Embodiment 3

[0067] (1) Decomposition of carnallite

[0068] After preheating the carnallite mine brine to 70°C, add the carnallite from step (3) into the carnallite stirring tank at a mass ratio of brine:carnallite of 1:0.28. Carnallite is obtained by directly evaporating and concentrating brine from the well. After stirring for 40 minutes, it is sent to the thickener, and the upper part of the thickener material overflows to the decomposition mother liquor storage tank; the quality of the dense underflow solid material accounts for 35% of the total mass of the material. Filtration and separation, decomposing the mother liquor, that is, the filtrate is sent to the evaporation and concentration process; the obtained potassium halite filter cake is washed with the potassium chloride crystallization mother liquor from step (4) according to the ratio of mother liquor:potassium halite filter cake mass ratio of 1:2.2 , wherein fresh water washing is used for initial production; after washing, i...

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Abstract

Disclosed is a method for producing potassium chloride, sodium chloride and magnesium sheets by brine mining in a carnallite mine. The method comprises the following steps: (1) decomposing the carnallite; (2) concentrating by evaporation; (3) separating the carnallite; (4) formulating an injection agent for the mining; (5) hot dissolving and crystallisation to obtain potassium chloride; (6) salt-leaching and drying to obtain sodium chloride; and (7) processing magnesium sheets. By using a hot injection agent to dissolve the ore, where the solubility of potassium chloride is much higher than that of sodium chloride and magnesium chloride at high temperatures, the present invention can thereby greatly decrease the exploitation rate of sodium chloride and magnesium chloride when a manufacturer produces potassium chloride, has a reduced amount of waste salts in the subsequent process discharging, has a significantly reduced amount of backfill, saves on costs, and comprehensively utilises the potassium and magnesium resources in the carnallite, which has a considerable economic benefit.

Description

technical field [0001] The invention relates to a method for producing potassium chloride, sodium chloride and magnesium flakes by utilizing carnallite mine mining brine, in particular, relates to a method for producing potassium chloride, chlorine Sodium and magnesium flakes. Background technique [0002] my country is a country with a serious shortage of potassium resources. Potassium deficiency is common in cultivated land, and the contradiction between supply and demand of potassium fertilizer is very prominent. The satisfaction rate of domestic potash fertilizers only accounts for about 30%, and the annual import of potash fertilizers reaches 4000kt (K 2 O) above. With the development and structural adjustment of agriculture, China's potash fertilizer consumption will also have a relatively high annual growth rate. It is estimated that by 2020, China's potash fertilizer consumption will reach 10,000kt (K 2 O), the market space is vast. [0003] The vast majority of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08C01F5/30
CPCC01D3/08C01F5/30C22B26/22
Inventor 冯跃华陈伟来刘小力杨晓烽周作其孙成高
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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