Method for recovering potassium chloride from abandon mine of salt lake

A recovery method and technology of potassium chloride, applied in the direction of alkali metal chlorides, etc., can solve the problems of digging the farm and harming oneself, discarding it, and the potassium fertilizer products are not up to the standard, and achieve the effect of extending the service life.

Inactive Publication Date: 2007-07-25
陈天强 +1
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Problems solved by technology

Among them, for carnallite or potassium mixed salt ore with a potassium chloride content of less than 10%, the potassium fertilizer products produced by flotation cannot reach the GB6549-1996 national standard; especially for carnallite with a potassium chloride content of less than 7%. All production enterprises discard rock or potash mixed salt mines; the former is reluctant to produce, the products do not meet the national standard, the output value is low, and the farmers are harming themselves; the latter is an irresponsible behavior of extravagantly discarding non-renewable resources

Method used

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  • Method for recovering potassium chloride from abandon mine of salt lake

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example 1

[0021] Example 1: Take by weighing 20T potassium chloride content of 5.3%, calcium sulfate content of 3%, sodium chloride content of 69.6%, magnesium chloride content of 8%, and water insoluble matter of 13% salt lake abandoned ore, and 26T of fresh water, stirring Fully stir in the tank to completely dissolve the potassium chloride in the abandoned mine into the solution; send the stirred suspension solution together with the salt sand to the sedimentation tank to obtain 22.1 tons of clarified solution; Stir and mix the saturated magnesium chloride solution with a concentration of 35Be in a stirring tank, send it to a sedimentation tank for overnight precipitation, and pump 56 tons of clear solution to the drying tank for natural drying. When the concentration of the solution is 35Be at 20°C , and the mother liquor was filtered to obtain 3.69 tons of carnallite with a potassium chloride content of 18.2%, a calcium sulfate content of 0.94%, a sodium chloride content of 13.2%, a...

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Abstract

This invention discloses a method for recovering KCl from waste ore of salt lake. The method comprises: utilizing waste ore of salt lake as the raw material, dissolving in solvent, removing the solid phase, adjusting Mg content, clarifying the precipitate, and solarizing to obtain high-purity carnallite. The method expands the exploitation range of potassium ore, and extends the service life of salt lake.

Description

technical field [0001] The invention relates to the technical field of production of alkali metal halides, in particular to a method for recovering potassium chloride from abandoned mines in salt lakes. Background technique [0002] At present, in the Hercynian region of Qinghai Province, the main producing area of ​​potassium chloride in my country, four fifths of the production enterprises are produced by carnallite flotation process. The main process is: raw material carnallite or potassium mixed salt ore and decomposition The solution is decomposed in the decomposition unit, so that the magnesium chloride in the carnallite is converted into a liquid phase. At the same time, during the decomposition process, a medicament that can separate potassium chloride and other impurities is added, and then the potassium chloride pulp is obtained by flotation by the flotation unit. Finally, remove the mother liquor from the potassium chloride pulp to obtain the product. Among them, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 陈天强高健淋
Owner 陈天强
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