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Method for producing large particles of heptahydrate magnesium sulfate and monohydrate magnesium sulfate from magnesium sulfate solution

A technology of magnesium sulfate heptahydrate and magnesium sulfate, applied in the direction of magnesium sulfate, etc., can solve the problems of inability to produce large particle products and low product quality

Inactive Publication Date: 2008-07-09
张荣阳 +2
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  • Application Information

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Problems solved by technology

To solve the problems of low product quality and inability to produce large particle products in existing methods

Method used

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  • Method for producing large particles of heptahydrate magnesium sulfate and monohydrate magnesium sulfate from magnesium sulfate solution

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Embodiment Construction

[0019] The production method of magnesium sulfate monohydrate

[0020] Get 1000Kg of magnesium sulfate circulation mother liquor, 200Kg of magnesium sulfite solid raw material. Put the above two materials into the mixing reaction tank for dispersion and oxidation treatment. Dispersion and oxidation are carried out using compressed hot air. The air temperature is 140°C, and the feed liquid temperature in the aeration tank is 110°C. Then pump the feed liquid into the adjusting kettle to adjust the pH value. The adjustment method adopts the method of adding sulfuric acid. When the pH value of the feed liquid reaches 6, stop adding acid. Then the solution with a neutral pH value is pumped into a plate and frame filter press for pressure filtration treatment, thereby obtaining a high-temperature saturated magnesium sulfate solution. Then pump this high temperature saturated magnesium sulfate solution into the negative pressure evaporator. Evaporate under negative pressure. The...

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Abstract

The invention discloses a method for producing magnesium sulfate, which is a method for producing macroaggregated magnesium sulfate heptahydrate and magnesium sulfate mono-hydrate from magnesium sulfate solution, in particular to a method for producing macroaggregated magnesium sulfate heptahydrate and magnesium sulfate mono-hydrate by employing solid containing magnesium sulfite (the chemical name is MgSO3) to obtain solution containing magnesium sulfate after oxidation treatment. The method of the invention comprises high temperature oxidizing magnesium sulfite, adding acid to adjust pH value, filtering solution, negative pressure evaporating and high temperature heating or seeding cooling for producing magnesium sulfate heptahydrate. The invention is simple in method and easy in operation. The product of magnesium sulfate produced by the method is high in product quality, and the selling price is increased. The method sufficiently employs byproduct of desulphurization process with magnesium as raw material, thereby decreasing the investment of environmental equipment in the desulphurization process with magnesium and operation cost, also decreasing the production cost of magnesium sulfate industry and achieving the win-win purpose of social benefit and economic benefit. The problems that in the existing method the product quality is low and macroaggregated magnesium sulfate heptahydrate can not be produced are resolved.

Description

technical field [0001] What the present invention announces is the production method of magnesium sulfate, specifically refers to utilizing magnesium sulfite solid (chemical name MgSO 3 ) containing magnesium sulfate solution obtained after oxidation treatment, and the method for producing large particle magnesium sulfate heptahydrate and magnesium sulfate monohydrate. Background technique [0002] Most of the current industrial enterprises use the magnesium oxide flue gas desulfurization process to control the smoke and dust, and the by-product produced after desulfurization is solid magnesium sulfite. However, the operating cost of this desulfurization process is high. In order to reduce the cost of environmental protection operation, enterprises use this by-product to produce magnesium sulfate as compensation. And traditional magnesium sulfate production method is after this solid magnesium sulfate is carried out oxidation treatment, has just obtained magnesium sulfate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
Inventor 张荣阳车太龙孙钧儒
Owner 张荣阳
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