Method for integrated production of magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite

A magnesium hydroxide and joint production technology, applied in the direction of magnesium hydroxide, magnesium carbonate, magnesium sulfate, etc., can solve the problems of unfavorable environmental protection requirements, high production costs, and inability to fully utilize by-products, so as to achieve environmental protection and reduce production cost effect

Inactive Publication Date: 2003-03-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the processes for producing high-quality magnesium salts from magnesite in the prior art are also limited to a single product, and the by-p

Method used

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  • Method for integrated production of magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite
  • Method for integrated production of magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Use a meter to measure 1500 liters of 2.0mol / L ammonium sulfate solution and add it to a 2 cubic meter reaction kettle. Add 270 kg of -120 mesh light-burned magnesium oxide powder under stirring conditions. After sealing the system, start stirring and slowly add 98% Industrial concentrated sulfuric acid, ensure that the temperature reaches above 90°C within 20 minutes, so that the ammonia gas is evaporated, and the ammonia gas evaporated within the first 30 minutes is condensed by the condenser to obtain ammonia water with a higher concentration (the concentration is 18%). into the storage tank as the raw material for the next step of magnesium hydroxide precipitation. After 30 minutes, the concentration of ammonia water is low, and concentrated sulfuric acid is added for neutralization to prepare ammonium sulfate by-product.

[0032] Reduce the acidity of the reaction system to pH 5.5-6.5 within 2 hours, discharge the material into the transition tank, pump it into the...

Embodiment 2

[0041] Add 1500 liters of ammonium sulfate solution that 2.0mol / L magnesium hydroxide and magnesium carbonate precipitation process obtains with meter to add in the reactor of 2 cubic meters, add 300 kilograms of -120 order light-burned magnesium oxide powder under stirring condition, will After the system is sealed, start stirring and slowly add 98% industrial concentrated sulfuric acid to ensure that the temperature reaches above 90°C within 20 minutes to evaporate the ammonia gas. The ammonia gas evaporated within the first 25 minutes is condensed by the condenser to obtain a higher concentration The ammoniacal liquor (its concentration is 20%) is put into storage tank as the raw material of next step magnesium hydroxide precipitation. After 25 minutes, the concentration of ammonia water is low, and concentrated sulfuric acid is added to neutralize the by-product of ammonium sulfate.

[0042] Reduce the acidity of the reaction system to pH 6.0-6.5 within 1.5 hours, discharg...

Embodiment 3

[0046] Use a meter to measure 1500 liters of ammonium sulfate solution produced by magnesium carbonate and magnesium hydroxide precipitation and add it to a 2 cubic meter reaction kettle. Add 400 kilograms of -120 mesh light-burned magnesium oxide powder under stirring conditions. After sealing the system, start Stir and slowly add 98% industrial concentrated sulfuric acid to ensure that the temperature reaches above 90°C within 20 minutes to evaporate the ammonia gas. The ammonia gas evaporated within the first 20 minutes is condensed by the condenser to obtain ammonia water with a higher concentration (the concentration 21%) is put into storage tank as the raw material of next step magnesium hydroxide precipitation. After 20 minutes, the concentration of ammonia water is low, and concentrated sulfuric acid is added to neutralize the by-product of ammonium sulfate.

[0047] Reduce the acidity of the reaction system to pH 6.0-6.5 within 1.5 hours, discharge the material into t...

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Abstract

A process for preparing magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite includes reaction of light-burned magnesium oxide powder obtained by calcining magnesite, the solution of ammonium sulfate as the by-product obtained by reaction with magnesium carbonate and magnesium hydroxide precipitate and industrial concentrated sulfuric acid, evaporating ammonia gas, dissolving in water, depositing to obtain magnesium hydroxide, controlling acidity and temp. filtering to remove impurities, cooling crystallizing to obtain magnesium sulfate heptahydrate, diluting the mother liquid, preparing alkaline magnetic carbonate by ammonium hydrogen carbonate method, and sulfuric acid absorption to residual ammonia water to obtain ammonium sulfate as by-product. Its advantage is no generation of gas and liquid pollutants.

Description

technical field [0001] The invention relates to a process method for producing high-quality magnesium salt series products from magnesite, in particular to a method for jointly producing magnesium sulfate, magnesium carbonate and magnesium hydroxide series products, and belongs to the technical field of inorganic chemical industry. Background technique [0002] my country's magnesite resources are very rich, its reserves are about 2 billion tons, ranking first in the world, of which the exploitable reserves are 1 billion tons, mainly distributed in Haicheng, Dashiqiao, Fengcheng, Liaoning, Laizhou, Hebei, etc. Xingtai and other regions. At present, the magnesium products produced by magnesite are mainly light-burned magnesia powder and various refractory materials, and there is a lack of high value-added magnesium products. Especially with the advancement of metallurgical industry technology, the amount of refractory materials is decreasing day by day. The economic benefits ...

Claims

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Application Information

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IPC IPC(8): C01F5/00C01F5/14C01F5/24C01F5/40C04B2/10
Inventor 朱国才孟广洲原绍刚
Owner TSINGHUA UNIV
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