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Preparing method for potassium chloride with low calcium sulfate content

A potassium chloride and product technology, applied in the field of potassium chloride production, can solve problems such as calcium sulfate removal

Inactive Publication Date: 2005-02-23
QINGHAI SALT LAKE IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem that the present invention needs is: solve the problem that calcium sulfate removes in the potassium chloride production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw materials of bittern and carnallite are taken from Qinghai Chaerhan Salt Lake.

[0026] Get 1000 grams of coarse carnallite and sieve it in saturated brine with a 200-mesh sieve to obtain about 770 grams of carnallite ore on the sieve and about 205 grams of ore on the sieve.

[0027] Take 500 grams of the above-mentioned upper layer of carnallite ore, add it to 2000 grams of saturated brine, stir for about 1 minute, add 0.016 grams of composite flotation agent, stir and mix for 15 minutes, start bubbling flotation for 20 minutes, and then scrape for 15 minutes. After 1 minute, stop the flotation. Filter and weigh the resulting foam layer ore and brine to obtain about 370 grams of lower-layer low-sodium carnallite, with a calcium sulfate content of 0.38%. After the low-sodium carnallite is subjected to a cold crystallization process, potassium chloride products, chlorine Calcium sulfate in potassium chloride is 0.45%.

[0028] The flotation agent is prepared as...

Embodiment 2

[0034] The raw materials of bittern and carnallite are taken from Chaerhan Salt Lake in Qinghai.

[0035] Get 1000 grams of coarse carnallite and sieve it with a 200-mesh sieve in saturated brine to obtain about 770 grams of carnallite ore on the sieve and about 205 grams of ore on the sieve.

[0036] Take 500 grams of the above-mentioned carnallite ore larger than 200 meshes, mix and separate rapidly with 2000 grams of fresh water to obtain about 200 grams of solid particles mainly composed of sodium chloride, potassium chloride and calcium sulfate; mix the resulting mixture with saturated brine Mix evenly at a ratio of 30%, add 500 g of flotation agent per ton of brine, stir for 0.5 hours to obtain about 60 g of potassium chloride particles by flotation, and then further wash, filter, and dry to obtain potassium chloride products, potassium chloride The content of calcium sulfate in the medium is 0.18%.

[0037] The flotation agent is prepared as follows:

[0038] 10wt%C...

Embodiment 3

[0042] The raw materials of bittern and carnallite are taken from Chaerhan Salt Lake in Qinghai.

[0043] Get 1000 grams of coarse carnallite and sieve it with a 200-mesh sieve in saturated brine to obtain about 770 grams of carnallite ore on the sieve and about 205 grams of ore on the sieve.

[0044] Take 500 grams of the above-mentioned upper layer of carnallite ore, add it to 2000 grams of saturated brine, stir for about 1 minute, add 0.016 grams of composite flotation agent, stir and mix for 15 minutes, start bubbling flotation for 20 minutes, and then scrape for 15 minutes. After 1 minute, stop the flotation. Filter and weigh the resulting foam layer ore and brine to obtain about 370 grams of lower-layer low-sodium carnallite, with a calcium sulfate content of 0.38%. After the low-sodium carnallite is subjected to a cold crystallization process, potassium chloride products, chlorine Calcium sulfate in potassium chloride is 0.45%.

[0045] The flotation agent is prepared...

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Abstract

A process for preparing the potassium chloride product with low content of calcium sulfate features that its technological route includes classifying, cold decomposing and forward floatation, or classifying, reverse floatation, and cold crystallizing. Its raw material is carnallite.

Description

technical field [0001] The invention relates to a method for producing potassium chloride, in particular to a method for preparing potassium chloride by using carnallite as a raw material and adopting a forward flotation or reverse flotation-cold crystallization process. Background technique [0002] my country's salt lakes are rich in resources, among which Chaerhan Salt Lake is rich in potassium chloride resources (which exist in the form of carnallite), with a reserve of 145 million tons, accounting for 97% of the country's proven salt lake reserves. [0003] In the process of preparing potassium chloride from carnallite, forward flotation or reverse flotation-cold crystallization is the most advanced process widely used at home and abroad. The main steps of the reverse flotation-cold crystallization method are: after the carnallite ore is mixed with brine, it is sent to the flotation equipment, and the alkylmorpholine is used as the flotation agent for flotation to obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01D3/14
Inventor 王相田张婉萍宋兴福汪瑾于建国李小松李辉林
Owner QINGHAI SALT LAKE IND GROUP
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