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Method for extracting potassium chloride from carbonate type salt lake

A technology of carbonate type and potassium chloride, applied in the direction of alkali metal chloride, etc., can solve the problems of long production time, large equipment investment, unfriendly environment, etc., and achieve short production time, low quality requirements and simple process Effect

Inactive Publication Date: 2012-04-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flotation of KCl by flotation method has the disadvantages that the tailings and flotation agents are not friendly to the environment, the particle size of the raw ore is high, the equipment investment is large, and the production time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 A kind of method of extracting potassium chloride from carbonate type salt lake, this method is at first with salt field potash mixed salt ore as raw material, ore composition is K + : 5.54%, Cl - : 49.73%, SO 4 2- : 3.17%, CO 3 2- : 0.89%, HCO 3 - : 0.66%, B 2 o 3 : 0.89%, Na + : 27.95%, H 2 O: 6.92%; then take 2kg of raw ore, add 1.42kg of water, stir fully (stirring time is 45.0min) to make it completely dissolved, then heat to 60°C, and carry out solid-liquid separation at this temperature to obtain 1227.0g tailings (K + Content is 3.50%) and 2027.5g mother liquor (K + content is 8.00%); finally the mother liquor is cooled to 2.0 ℃ and solid-liquid separation is carried out to obtain 1826.5g recycled mother liquor (K + Content is 5.09%) and 163.0g KCl product (K + The content is 44.67%). The KCl product has a purity of 85.9%.

Embodiment 2

[0014] Embodiment 2 A kind of method of extracting potassium chloride from carbonate type salt lake, this method at first takes salt field potassium mixed salt ore as raw material, and former ore is composed of K + : 13.07%, Cl - : 49.65%, SO 4 2- : 5.24%, CO 3 2- : 1.87%, HCO 3 - : 0.11%, B 2 o 3 : 0.86%, Na + : 28.14%, H 2 O: 1.78%; then take 2kg of raw ore, add 1.43kg of water, stir fully (stirring time is 35.0min) to make it completely dissolved, then heat to 70°C, and carry out solid-liquid separation at this temperature to obtain 711.5g of tailings (K + Content is 3.53%) and 1586.6g mother liquor (K + content is 8.59%); finally the mother liquor is cooled to 14.5 ℃ and solid-liquid separation is carried out to obtain 1240.0g recycled mother liquor (K + Content is 5.09%) and 140.0g KCl product (K + The content is 45.38%). The KCl product has a purity of 87.3%.

[0015] Add 890g ore amount, 338.0g water yield in the mother liquor of recycling, repeat aforeme...

Embodiment 3

[0016] Embodiment 3 A kind of method of extracting potassium chloride from carbonate type salt lake, this method is at first with salt field potash mixed salt ore as raw material, ore composition is K + : 6.37%, Cl - : 49.73%, SO 4 2- : 3.22%, CO 3 2- : 0.90%, HCO 3 - : 0.12%, B 2 o 3 : 0.87%, Na + : 28.11%, H 2 O: 7.10%; then take 2kg of raw ore, add 1.44kg of water, stir fully (stirring time is 35.0min) to completely dissolve it, heat to 82°C, and carry out solid-liquid separation at this temperature to obtain 786.5g of tailings (K + Content is 3.57%) and 1943.0g mother liquor (K + Content is 8.35%); Carry out solid-liquid separation after the mother liquor is cooled to 0.0 ℃ at last, can obtain the mother liquor of 1300.0g recycling and 187.5g KCl product (K + Content is 46.92%), and this KCl product purity is 90.2%.

[0017] Add 1688.0g ore quantity, 452.0g water yield in the mother liquor of recycle, repeat aforesaid process, obtain 1717.0g secondary circulat...

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PUM

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Abstract

The invention relates to a method for extracting potassium chloride from a carbonate type salt lake. The method comprises the following steps: based on brine pan potassium mixed ore as a raw material, adding water to the raw material, fully stirring so that the raw material is completely dissolved and then heating to 60-90 DEG C; carrying out solid-liquid separation at the temperature of 60-90 DEG C so as to obtain tailings and a mother liquid; and finally, cooling the mother liquid to 0.0-15 DEG C and then carrying out solid-liquid separation so as to obtain the mother liquid which can be circularly used and a KCl product. According to the invention, KCl is prepared by using a hot melting method, process is simple, production time is short, and the obtained KCl product has high purity.

Description

technical field [0001] The invention relates to a method for extracting KCl from a potash mixed salt mine in a salt field in the technical field of inorganic salt chemical industry, in particular to a method for extracting potassium chloride from a carbonate-type salt lake. Background technique [0002] Potassium resources in Zabuye, Tibet mainly exist in liquid brine, and potassium ions are mainly converted into KCl, Na 2 SO 4 3K 2 SO 4 form exists. Flotation of KCl by flotation has the disadvantages that the tailings and flotation reagents are not friendly to the environment, the particle size of the raw ore is high, the investment in equipment is large, and the production time is long. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for extracting potassium chloride from carbonate type salt lakes with simple process and high product purity. [0004] For solving the above problem, a kind of method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/08
Inventor 张志宏马艳芳董生发朱建荣程怀德
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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