Comprehensive recycling process for potassium-containing tailings after extraction of potassium sulfate from salt lake brine

A technology of salt lake brine and potassium sulfate, applied in the field of salt chemical industry, can solve the problems of low added value, waste of resources, etc., and achieve the effects of reducing the amount brought in, saving production costs, and high product yield

Active Publication Date: 2020-12-22
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The added value of this product is low, and the potassium ions and sulfate ions in the tailings are not fully recycled, resulting in a waste of resources to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, the potassium-containing tailings after extracting potassium sulfate from salt lake brine are selected from a domestic Xinjiang salt lake potassium sulfate factory, and the composition of potassium chloride flotation tailings is: K + 3.883%, Mg 2+ 5.015%, Cl - 27.40%, SO 4 2- 21.55%, Na + 16.30%, H 2 O25.85%; langbeinite flotation tailings composition is: K + 4.673%, Mg 2+ 2.520%, Cl - 45.77%, SO 4 2- 11.10%, Na + 27.48%, H 2 O8.455%.

[0041] (1) Separating the potassium chloride flotation tailings through a vibrating screen (controlling the sieve particle size to -20 mesh), the sieve material accounts for 44.02% of the potassium chloride flotation tailings mass, and the underscreen material accounts for 44.02% of the potassium chloride flotation tailings mass. 55.98% of the quality of flotation tailings, the composition of the sieve is: K + 1.962%, Mg 2+ 6.932%, Cl - 21.67%, SO 4 2- 25.84%, Na + 12.13%, H 2 O31.47%, the undersiev...

Embodiment 2

[0048] In this embodiment, the potassium-containing tailings after extracting potassium sulfate from salt lake brine are selected from a domestic Qinghai salt lake potassium sulfate factory, and the composition of potassium chloride flotation tailings is: K + 3.195%, Mg 2+ 3.824%, Cl - 35.85%, SO 4 2- 13.01%, Na + 24.34%, H 2 O20.47%; langbeinite flotation tailings composition is: K + 2.690%, Mg 2+ 1.520%, Cl - 46.06%, SO 4 2- 7.550%, Na + 28.88%, H 2 O13.30%.

[0049] (1) Separating the potassium chloride flotation tailings through a vibrating screen (controlling the sieve particle size to -40 mesh), the sieve material accounts for 21.37% of the potassium chloride flotation tailings mass, and the underscreen material accounts for 21.37% of the potassium chloride flotation tailings mass. 78.63% of the quality of the flotation tailings, the composition of the sieve is: K + 0.863%, Mg 2+ 4.174%, Cl - 45.33%, SO 4 2- 15.25%, Na + 28.09%, H 2 O6.30%, the undersi...

Embodiment 3

[0057] In this embodiment, the potassium-containing tailings after extracting potassium sulfate from salt lake brine are selected from a domestic Qinghai salt lake potassium sulfate factory, and the composition of potassium chloride flotation tailings is: K + 2.166%, Mg 2+ 4.903%, Cl - 28.00%, SO 4 2- 17.18%, Na + 15.661%, H 2 O32.09%; langbeinite flotation tailings composition is: K + 2.467%, Mg 2+ 2.322%, Cl - 40.96%, SO 4 2- 8.138%, Na + 24.46%, H 2 O21.65%.

[0058] (1) Separating the potassium chloride flotation tailings through a vibrating screen (controlling the sieve size to -20 mesh), the sieve material accounts for 27.78% of the potassium chloride flotation tailings mass, and the underscreen material accounts for 27.78% of the potassium chloride flotation tailings mass. 72.22% of the quality of flotation tailings, the composition of the sieve is: K + 0.954%, Mg 2+ 3.243%, Cl - 44.33%, SO 4 2- 15.25%, Na + 29.16%, H 2 O7.060%, the undersieve composi...

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Abstract

The invention discloses a comprehensive recycling process for potassium-containing tailings after extraction of potassium sulfate from salt lake brine. The comprehensive recycling process comprises the following steps: (1) separating potassium chloride flotation tailings and picromerite flotation tailings through a vibrating screen; (2) mixing the potassium chloride flotation tailings obtained inthe step (1) and the picromerite flotation tailings screen underflow, adding water or brackish water or picromerite conversion mother liquor, then adding a reverse flotation reagent, and carrying outflotation-solid-liquid separation to obtain industrial salt; (3) adding fresh water or brackish water or potassium sulfate high-potassium mother liquor into the sodium chloride flotation tailings obtained in the step (2) to be mixed, and conducting conversion-solid-liquid separation; and (4) mixing potassium chloride with the picromerite concentrate obtained in the step (3) and water or brackish water, conducting converting to generate potassium sulfate and potassium sulfate high-potassium mother liquor, and after solid-liquid separation, washing and drying solid potassium sulfate to obtain apotassium sulfate product. The method does not need an ore grinding process, is low in energy consumption, mainly prepares potassium sulfate and industrial salt, and is good in product purity, high inyield and low in cost.

Description

technical field [0001] The invention relates to a process for comprehensive recovery and utilization of potassium-containing tailings after potassium sulfate is extracted from salt lake brine, and belongs to the technical field of salt chemical industry. Background technique [0002] There are not many salt lakes in the world, but the number of salt lakes that can be exploited and have development and utilization value is decreasing. From the perspective of resource utilization, salt lake resources with development and utilization value have become as important limited resources as petroleum, rare earth and other resources. Making full use of the increasingly scarce salt lake resources is of great significance to the development of salt chemical industry. [0003] The production process of potassium sulfate from salt lake brine is mainly to dry out the corresponding potassium mixed salt ore and carnallite ore in the corresponding salt fields, produce potassium chloride and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/10C01D5/12B07B1/28B03D1/00
CPCC01D5/10C01D5/12B07B1/28B03D1/00
Inventor 夏适谢超冯文平孙成高高文远汤建良
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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