Method for producing high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt

A potassium chloride solution, potassium chloride technology, applied in the direction of alkali metal chloride, alkali metal halide purification, etc., can solve the problem of uneconomical production cost, uneven mixing of solid and solid phase, affecting product quality and uniform stability And other issues

Active Publication Date: 2014-02-12
ZHEJIANG DAYANG BIOTECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that pure sodium chloride and potassium chloride must be obtained separately, and then mixed to obtain a solid mixture, which is obviously uneconomical for production costs, and the mixing of solid and solid phases is also uneven, which will inevitably affect Product quality and uniformity

Method used

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  • Method for producing high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt
  • Method for producing high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Embodiment 1, a kind of method for producing high-purity potassium chloride solution and co-production of low-sodium salt required for the preparation of potassium carbonate, using agricultural grade potassium chloride (potassium chloride with a purity of 95.1%) as raw material, the following steps are carried out successively :

[0075] 1), Potassium chloride dissolved rinse:

[0076] Put 3000Kg of agricultural grade potassium chloride with a content (purity) of 95.1% into 2400L of washing liquid, stir and rinse at room temperature for 60min at a speed of 600 rpm.

[0077] The washing solution is a saturated solution of potassium chloride with a purity of ≥90% or the potassium chloride rinsing solution obtained in the following step 2) (recycled and reused).

[0078] Remarks: Initially, use the above-mentioned saturated solution of potassium chloride with a purity ≥ 90%; then, use the potassium chloride rinse solution obtained by centrifugation in the following step 2...

Embodiment 2

[0116] Embodiment 2, a kind of method for producing high-purity potassium chloride solution and co-production low-sodium salt required for the preparation of potassium carbonate, using agricultural grade potassium chloride (potassium chloride with a purity of 95.1%) as raw material, the following steps are carried out successively :

[0117] Step 1) to step 3) are the same as in Example 1.

[0118] 4), impurity removal, heat preservation and precipitation, clear liquid filtration:

[0119] Add 5Kg calcium oxide to potassium chloride solution I, stir for 10 minutes, then add 80L potassium dihydrogen phosphate mother liquor (concentration: 300g / L) and 8Kg ammonium chloride, stir for 10 minutes, then add potassium hydroxide to adjust the pH of the solution, control Solution pH=12±0.2, finally add 100Kg sawdust, stir for 30 minutes; keep warm and naturally sink for 2 hours at around 45-50°C;

[0120] The rest are the same as step 4 of embodiment 1).

[0121] The dried potassium...

Embodiment 3

[0126] Embodiment 3, a kind of method for producing high-purity potassium chloride solution and co-production low-sodium salt required for the preparation of potassium carbonate, using agricultural grade potassium chloride (potassium chloride with a purity of 95.1%) as raw material, the following steps are carried out successively :

[0127] Step 1) to step 3) are the same as in Example 1.

[0128] 4), impurity removal, heat preservation and precipitation, clear liquid filtration:

[0129] Add 5Kg calcium oxide to potassium chloride solution I, stir for 10 minutes, then add 120L potassium dihydrogen phosphate mother liquor (concentration: 300g / L) and 12Kg ammonium chloride, stir for 10 minutes, then add potassium hydroxide to adjust the pH of the solution, control Solution pH=12±0.2, finally add 100Kg sawdust, stir for 30 minutes; keep warm and naturally settle for 2 hours at around 45-50°C.

[0130] The rest are the same as step 4 of embodiment 1).

[0131] The dried potas...

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Abstract

The invention discloses a method for producing a high-purity potassium chloride solution for preparation of potassium carbonate and co-producing low sodium salt. The high-purity potassium chloride solution for producing potassium carbonate is prepared from agricultural grade potassium chloride serving as a raw material by the steps of rinsing, dissolving, removing impurities, settling, filtering and the like, wherein the Ca<2+> content is less than or equal to 0.0001%, the Mg<2+> content is less than or equal to 0.0001%, the Fe content is less than or equal to 0.0001%, the content of suspended solids (SS) is less than or equal to 0.1 mg/L, pH is 12+/-0.2, and the potassium chloride content is more than or equal to 99.0%, so the quality standard of an ion exchange method for producing the potassium carbonate is complete met. Potassium chloride rinsing liquid and leachate is recycled, evaporated and concentrated, and subjected to crystallization separation according to the dissolution characteristics of the potassium chloride and sodium chloride, the potassium chloride obtained by recycling can serve as the raw materials to be reused, and the mixture containing the potassium chloride and the sodium chloride meets the quality requirement of low sodium salt.

Description

technical field [0001] The invention relates to the field of inorganic chemical industry, in particular to a method for producing high-purity potassium chloride required for the production of potassium carbonate and co-producing low-sodium salt. Background technique [0002] Potassium carbonate is an important chemical raw material. It is widely used in chemical industry, light industry, picture tube glass bulb, pharmaceutical, food, welding rod and non-ferrous metallurgy and other industries. The main method of potassium. The ionic membrane electrolysis method is to electrolyze potassium chloride, firstly obtain potassium hydroxide and by-product chlorine gas, and then obtain potassium carbonate through carbonation of potassium hydroxide. This process has the advantages of stable product quality and less pollution of three wastes, but in the production process The quality requirements for the raw material potassium chloride are very high, and it needs to be imported from a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/04
Inventor 王国平徐旭辉关卫军汪贤玉涂永福钱雪明孔庆颐
Owner ZHEJIANG DAYANG BIOTECH GROUP
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