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Technology for preparating boric acid, magnesium carbonate and sodium sulphate by combined method

A technology of magnesium carbonate and boric acid, which is applied in the direction of magnesium carbonate, alkali metal sulfite/sulfite, boron oxide, etc., can solve problems such as poor efficiency, polluting the environment, and product quality not up to product standards, etc., to achieve benefits Effects of investment, energy saving, and expansion of processing range

Inactive Publication Date: 2007-02-14
沙文斌
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Problems solved by technology

There are two ways to treat mother liquor, one is to discharge, which seriously pollutes the environment; the other is to recycle magnesium sulfate, but magnesium sulfate contains boric acid, the product quality cannot meet the product standard, and the benefit is poor

Method used

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Embodiment Construction

[0015] The first step reaction: 2.00 tons of fine powder boron-magnesium ore and 0.75 tons of 85% sulfuric acid are added to the reaction tank, water is added, and the reaction is continuously stirred at 95°C. When the reaction is complete, filter while hot, and the filtrate enters the cooling crystallizer, and cools and crystallizes under stirring. Use a centrifuge to separate wet boric acid, wash and dry it to obtain a finished product. The filtrate enters the second step reaction pool. The second step reaction: add dissolved sodium carbonate solution in the filtrate obtained after the first step reaction process, the amount of added sodium carbonate is 0.83 tons, control the temperature at about 55 ° C, and react under constant stirring. After the reaction is complete, filter to obtain magnesium carbonate, which is washed and dried to obtain the finished product. The filtrate after filtering magnesium carbonate is concentrated in a direct-fired evaporator, and filtered wh...

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Abstract

The process of co-producing boric acid, magnesium carbonate and sodium sulfate includes the first reaction step of reacting ascharite with 85 % concentration sulfuric acid to obtain wet boric acid and filtering to obtain filtrate; and the second reaction step of reacting the filtrate and sodium carbonate solution inside a reaction pond, filtering to obtain magnesium carbonate, concentrating the filtrate in a directly burning evaporator and hot filtering to obtain anhydrous sodium sulfate.

Description

Technical field: [0001] The invention relates to the technical field of boron ore processing. Background technique [0002] At present, the method for producing boric acid from boron-magnesium ore in China is mainly to use sulfuric acid to decompose boron-magnesium ore. After boric acid is produced, boric acid and magnesium sulfate in the mother liquor reach a co-saturation point. There are two ways to treat the mother liquor, one is to discharge, which seriously pollutes the environment; the other is to recycle magnesium sulfate, but magnesium sulfate contains boric acid, the product quality cannot meet the product standard, and the benefit is poor. This process seeks a processing method of boron-magnesium ore, which can not only solve the problem of mother liquor treatment in the process, but also enable comprehensive utilization of active components in boron-magnesium ore. The final product of the present invention obtains boric acid, magnesium carbonate and sodium sulfa...

Claims

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Application Information

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IPC IPC(8): C01B35/10C01F5/24C01D5/00
Inventor 沙文斌
Owner 沙文斌
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