Reverse floatation-cold crystallization process for producing potassium chloride

A production method and technology of potassium chloride, applied in the direction of alkali metal chloride, alkali metal halide purification, etc., can solve the problems of poor product quality, low utilization rate of potassium chloride, etc., achieve high product quality, prevent high-concentration excessive The formation of saturated solution, the effect of large grain size

Inactive Publication Date: 2007-11-07
陈颖
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The purpose of the present invention is to make a major improvement on the defects of poor product quality and low utilization rate of potassium chloride in the existing reverse flotation-cold crystallization process. The recovered nanofiltration membrane permeate with high sodium chloride content is used to recover the fine crystals of potassium chloride through the microfiltration membrane when the carnallite concentrate is coldly decomposed into magnesium chloride and crystallized to produce potassium chloride. The crystallization mother liquor is

Method used

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  • Reverse floatation-cold crystallization process for producing potassium chloride
  • Reverse floatation-cold crystallization process for producing potassium chloride
  • Reverse floatation-cold crystallization process for producing potassium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take by weighing 300 kilograms of carnallite raw materials (carnallite contains potassium chloride 21.7%, magnesium chloride 27.7%, sodium chloride 18%) through screening, add in the saturated solution of 1 ton of carnallite for slurrying, then add 30 grams of carnallite Fatty amide sodium chloride flotation agent reverse flotation twice, then carry out sedimentation and concentration (thickness one), filter and separate and remove most of sodium chloride to prepare carnallite containing sodium chloride less than 6% (carnallite essence Material) 260 kg (carnallite contains potassium chloride 25.7%, magnesium chloride 32.2%, sodium chloride 5.8%). 260 kilograms of carnallite are decomposed and crystallized with 195 kilograms of fresh water, then sedimentation and concentration (thickness two), filtration and separation to obtain 49 kilograms of potassium chloride semi-finished products and 406 kilograms of slurry, and 45.2 kilograms of potassium chloride finished products...

Embodiment 2

[0045] Take by weighing 300 kilograms of carnallite raw materials (carnallite contains potassium chloride 21.7%, magnesium chloride 27.7%, sodium chloride 18%) through weighing, add the saturated solution of 1 ton of carnallite (this saturated solution uses the chlorine of recovery Potassium chloride dialysate is prepared by adding carnallite), then add 120 grams of fatty amide sodium chloride flotation agent for reverse flotation twice, then carry out sedimentation and concentration (thick one), filter and separate to remove most of the sodium chloride Prepared 279 kg of refined carnallite (carnallite concentrate) containing less than 6% sodium chloride (purified carnallite contains potassium chloride 26.2%, magnesium chloride 32.2%, sodium chloride 5.6%). 279 kilograms of carnallite are decomposed and crystallized with 200 kilograms of fresh water, then sedimentation and concentration (dense two), filter and separate to obtain 57 kilograms of potassium chloride semi-finished ...

Embodiment 3

[0049] Take by weighing 300 kilograms of carnallite raw materials (carnallite contains potassium chloride 21.7%, magnesium chloride 27.7%, sodium chloride 18%) through screening, add the saturated solution of 750 kilograms of carnallite (this saturated solution uses the chlorine of recovery Potassium chloride dialysate is prepared by adding carnallite), then add 90 grams of fatty amide sodium chloride flotation agent for reverse flotation twice, then carry out sedimentation and concentration (thick one), filter and separate to remove most of the sodium chloride Prepared 282 kg of refined carnallite (carnallite concentrate) containing less than 6% sodium chloride (purified carnallite contains potassium chloride 26.5%, magnesium chloride 32.1%, sodium chloride 5.7%). 282 kilograms of carnallite are decomposed and crystallized with 200 kilograms of fresh water, then sedimentation and concentration (thickness two), filtration and separation to obtain 58 kilograms of potassium chlor...

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Abstract

The reverse floatation and cold crystallization process for producing potassium chloride includes the following four steps: 1. reverse floatation to prepare low sodium carnallite; 2. decomposing low sodium carnallite in fresh water, crystallizing, centrifugally filtering and drying to prepare potassium chloride product; 3. microporous membrane filtering to recover fine potassium chloride crystal, dissolving, returning to potassium chloride crystallizer for secondary crystallization to prepare potassium chloride; and 4. returning the bittern for reuse. The process has potassium chloride yield up to 80 %, great potassium chloride crystal granularity and high product quality, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a production method of potassium chloride, in particular to a reverse flotation-cold crystallization potassium chloride production method combining fine grain elimination and membrane coupling, and belongs to the field of inorganic chemical industry. Background technique [0002] Potassium chloride production process has experienced decades of development and continuous technological progress, during which many production methods for the production of potassium chloride have emerged, such as: salt field recrystallization method, re-election method, etc., all due to the environment, conditions, For reasons of climate, technology, etc., some of them were just given up after experiments or pilot tests, but did not realize industrialized production. The four production methods of cold decomposition forward flotation, reverse flotation cold crystallization, thermal dissolution and brine mixing have not only realized industrial produ...

Claims

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Application Information

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IPC IPC(8): C01D3/08C01D3/14
Inventor 陈颖
Owner 陈颖
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