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Apparatus and method for producing potassium chloride and co-producing magnesium sulfate by mixing brine

A magnesium sulfate and potassium chloride technology, applied in the direction of magnesium sulfate, alkali metal chloride, etc., can solve the problem of no comprehensive utilization of mother liquor, and achieve the effects of reducing steam consumption, optimizing production process, and reducing steam consumption

Inactive Publication Date: 2015-04-22
李树生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, most of the mother liquor of domestic seawater salt production has not been comprehensively utilized, the market needs to be developed urgently, and it is imminent to seek a production process with higher technology and economy

Method used

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  • Apparatus and method for producing potassium chloride and co-producing magnesium sulfate by mixing brine

Examples

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Effect test

example 1

[0047] Get 1000 kilograms of concentration and be the refining salt four-effect bittern of 31.3 degrees Baume, it is composed of: magnesium sulfate: 91.5g / l magnesium chloride: 161.0g / l potassium chloride: 32.0g / l sodium chloride: 105.0g / l , add 70 kilograms of high-temperature salt filter cakes, the initial mixed bittern solution is turbid, and the temperature is 43 degrees. Stirring continued for 95 minutes, and the solution bittern was transparent, indicating that the magnesium sulfate monohydrate was completely dissolved. The temperature of bittern is 28 degrees, and the concentration is 32.6 Baume degrees. Take the clarified liquid for analysis, magnesium sulfate: 115.0g / l magnesium chloride: 161.8g / l potassium chloride: 34.5g / l sodium chloride: 88.0g / l. After vacuum filtration, 42 kg of solid-phase sodium chloride was separated, and the bittern potassium, magnesium, and sulfate radicals after dissolving high-temperature salt all had a large increase. In addition to the...

example 2

[0049] Get 1000 kilograms of concentrations and be 29.1 Baume degrees normal temperature salt-making bittern, it consists of: magnesium sulfate: 73.9g / l magnesium chloride: 133.2g / l potassium chloride: 27.5g / l sodium chloride: 120.5g / l. Add 80 kg of high-temperature salt, and continue to stir for 110 minutes. The magnesium sulfate monohydrate is completely dissolved, and the solution concentration is 32.2 degrees Baume. Take the clarified liquid for analysis, magnesium sulfate: 109.0g / l magnesium chloride: 142.5g / l potassium chloride: 29.7g / l sodium chloride: 86.5g / l. 23.5 kilograms of solid-phase sodium chloride were separated out. Mother liquor composition after freezing is identical with example 1. The effect of bittern in dissolving high-temperature salt is obvious.

example 3

[0051] Get 1000 kilograms of concentration and be the normal temperature salt bittern of 28.3 degrees Baume, it is composed of: magnesium sulfate: 62.1g / l; Magnesium chloride: 110.2g / l; Repone K: 20.2g / l; Sodium chloride: 155g / l l. Add 95 kg of high-temperature salt, and continue to stir for 115 minutes until the magnesium sulfate monohydrate is completely dissolved, and the solution concentration is 31.2 degrees Baume. Take the clarified liquid for analysis, magnesium sulfate: 99.6g / l; magnesium chloride: 131.8g / l; potassium chloride: 23.8g / l; sodium chloride: 128.5g / l. 31 kilograms of sodium chloride were precipitated in solid phase. Magnesium sulfate composition is identical with example 1 in the mother liquor component after freezing. The concentration of bittern increases, and the effect of salting out is obvious.

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Abstract

The invention relates to an apparatus and a method for producing potassium chloride and co-producing magnesium sulfate by mixing brine; high-temperature salt filter cake or magnesium sulfate monohydrate suspending in mother liquid recovered from the production of a magnesium sulfate monohydrate product is dissolved by virtue of salt-producing brine; by dissolving magnesium sulfate in solid phase and by separating and recovering sodium chloride in solid phase, bittern concentration is improved to 29.5-33.0 Baume degrees from 28.0-31.5 Baume degrees, which is to say, by adding the mixed salt slurry of high-temperature salt, the initial Baume degree of salt-producing bittern is improved by 1.5-2.5 Baume degrees, so that the output of frozen magnesium sulfate is doubled on the premise of same energy consumption. Crystallization water is directly evaporated from magnesium sulfate crystal, so that the magnesium sulfate monohydrate is produced. In the bittern, the concentrations of potassium, bromine and magnesium chloride are improved while the concentration of sodium chloride is remarkably reduced. Entering into a potassium chloride system, the bittern can be used for reducing steam consumption in an evaporating process. The blending amount of old brine in the potassium chloride evaporating process can be gradually reduced until the old brine is not blended. Production process of the potassium chloride is optimized.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of seawater desalination concentrated seawater, seawater, and underground brine salt production mother liquor, and is especially suitable for salinization enterprises that produce potassium chloride and magnesium sulfate by evaporating and concentrating bittern above 28 degrees Baume. Background technique [0002] The production of potassium chloride by adding brine to salt mother liquor or salt lake brine is a comprehensive utilization technology of bittern adopted by the former Soviet Union in the 1950s. Seawater salt production enterprises in northern my country have been using this technology and have made great improvements. The process tends to be perfect, and the energy consumption is gradually reduced. It can be regarded as the optimal process for the comprehensive utilization of concentrated seawater salt production mother liquor and the realization of zero discharge of concentra...

Claims

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Application Information

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IPC IPC(8): C01D3/06C01F5/40
Inventor 李树生
Owner 李树生
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