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A method for extracting and recovering potassium chloride left in salt lake tail salt and waste carnallite

A carnallite and potassium chloride technology, applied in the purification of alkali metal halides, etc., can solve the problems of long process time, difficulty in application, waste of resources, etc., achieve simple process flow, solve solution loss, and prolong flow time Effect

Active Publication Date: 2016-11-09
陈杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method increases the mining range of potassium ore and prolongs the service life of the salt lake, it has the defects of large water consumption, long process time, and failure to combine with the reverse flotation process in the actual production process of the salt lake. Therefore, , it is difficult to apply to the actual production
[0005] The existing method for recycling potassium chloride has problems such as high cost and low efficiency for the recovery of low-potassium waste materials. At present, there is no economical and applicable production device and production process for its processing and recycling, so it is discarded and unused, which not only causes a serious waste of resources, Long-term stacking affects normal production and pollutes the environment

Method used

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  • A method for extracting and recovering potassium chloride left in salt lake tail salt and waste carnallite
  • A method for extracting and recovering potassium chloride left in salt lake tail salt and waste carnallite
  • A method for extracting and recovering potassium chloride left in salt lake tail salt and waste carnallite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 10 tons of waste materials with a potassium content of 3.7% are conveyed to the mixing tank by a belt, and saturated old brine and fresh water are added to the mixing tank in the ratio of waste: saturated old brine: fresh water is 1: 0.5: 1.4, wherein the saturated old brine 5 tons of brine and 14 tons of fresh water. After being stirred by a stirrer, a solution of waste material is obtained. The waste solution flows into the decomposition tank through the connecting pipe, and then the potassium chloride in the waste solution is fully dissolved in water after being stirred by the agitator. Detect gained solution Baume degree in the decomposition tank, determine to add the total amount of saturated old brine in the first adjustment tank and the second adjustment tank to be 11.8 tons, after the first adjustment tank and the second adjustment tank are allocated, the solution Baume degree is 29°Be~31.5°Be. There is no specific limit to the addition amount of the saturated...

Embodiment 2

[0065] 20 tons of waste materials with a potassium content of 3.7% are transported to the mixing tank by a belt, and saturated old brine and fresh water are added to the mixing tank in a ratio of waste: saturated old brine: fresh water of 1: 0.5: 0.5, wherein the saturated old brine 10 tons of brine and 10 tons of fresh water. After being stirred by a stirrer, a solution of waste material is obtained. The waste solution flows into the decomposition tank through the connecting pipe, and then the potassium chloride in the waste solution is fully dissolved in water after being stirred by the agitator. Detect gained solution Baume degree in the decomposition tank, determine to add the total amount of saturated old brine in the first adjustment tank and the second adjustment tank to be 23.5 tons, after the first adjustment tank and the second adjustment tank are allocated, the solution Baume degree is 29°Be~31.5°Be. The solution obtained in the second adjustment tank flows into t...

Embodiment 3

[0068] 15 tons of waste materials with a potassium content of 3.7% are transported to the mixing tank by a belt, and saturated old brine and fresh water are added to the mixing tank in the ratio of waste: saturated old brine: fresh water is 1: 0.5: 1.3, wherein the saturated old brine 7.5 tons of brine and 19 tons of fresh water. After being stirred by a stirrer, a solution of waste material is obtained. The waste solution flows into the decomposition tank through the connecting pipe, and then the potassium chloride in the waste solution is fully dissolved in water after being stirred by the agitator. Detect gained solution Baume degree in the decomposition tank, determine to add the total amount of saturated old brine in the first adjustment tank and the second adjustment tank to be 17.5 tons, after the first adjustment tank and the second adjustment tank are allocated, the solution Baume degree is 29°Be~31.5°Be. The solution obtained in the second adjustment tank flows int...

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Abstract

The invention relates to a method for extracting and recycling residual potassium chloride from salt-lake tail salt and waste carnallite. The method comprises the following steps: mixing to-be-recycled waste, aged saturated brine and fresh water to obtain a waste-dissolved solution, adding aged saturated brine at least once to adjust the baume degree of the waste-dissolved solution, and keeping the baume degree of the waste-dissolved solution within a preset range in such a way that the waste-dissolved solution is introduced into a salt pond and then crystallized to form carnallite. According to the method, high-quality carnallite with the potassium content great than or equal to 15% can be obtained through the technical processes such as batching, decomposing, allocating, mixing, clarifying and crystallizing. The method for extracting and recycling residual potassium chloride from salt-lake tail salt and waste carnallite can be used for effectively recycling residual potassium from the waste and has the advantages of low cost, high efficiency, reduction of resource waste and the like; and a great amount of potassium chloride can be refined from the high-quality carnallite by a flotation technology.

Description

technical field [0001] The invention relates to a method for extracting and recovering potassium chloride, in particular to a method for extracting and recovering potassium chloride left in salt lake tail salt and waste carnallite. Background technique [0002] Potassium chloride is mainly used in the inorganic industry and is the basic raw material for the manufacture of various potassium salts or alkalis, such as potassium hydroxide, potassium sulfate, potassium nitrate, potassium chlorate and potassium red alum. Potassium chloride is used as a diuretic and a drug for preventing and treating potassium deficiency in the pharmaceutical industry; it is used in the dye industry to produce G salt, reactive dyes, etc.; it is a kind of potassium fertilizer in agriculture. Increase the moisture in the lower layer of the soil and have the effect of drought resistance. [0003] At this stage, there are mainly the following technologies for producing potassium chloride products usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14
Inventor 陈杰
Owner 陈杰
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