Method for preparing magnesium salt from boric sludge

A technology of boron mud and magnesium salt, applied in the direction of magnesium sulfate, etc., can solve the problems of complex experimental equipment, low magnesium leaching rate, low acid utilization rate, etc., to avoid overflowing the reactor, reduce process risk, and increase magnesium content Effect

Pending Publication Date: 2021-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the magnesium content in boron mud is high, it is difficult to extract, because Mg in boron mud is based on Mg 2 SiO 4 , MgCO 3 Existing techniques for extracting magnesium from boron mud and a small number of complex mineral phases include acid method and carbonization method; among them, the acid method is divided into fire method and wet method, and the fire method is to combine boron mud and acid salt Calcination, then washing with water, filtration, and crystallization to obtain magnesium salt, the magnesium leaching rate of this method is low, while the wet method is to react boron mud and acid solution to prepare magnesium salt, this method requires an excessive amount of acid solution, the acid utilization rate is low, and carbonization The method is to mix MgCO in boron mud 3 Converted to Mg(OH) 2 Then in the carbonization unit with CO 2 A carbonization reaction occurs to produce light magnesium carbonate. The experimental equipment of this method is complicated, and the extraction rate of magnesium is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of method that adopts boron mud to prepare anhydrous magnesium sulfate of the present embodiment, comprises the steps:

[0028] First, take 10kg of boron mud and wash it with hot water at 80°C to remove B 2 o 3 , after drying, activated and calcined at 600°C for 120min, after grinding and pulverizing, magnetic separation treatment to remove iron, to obtain pretreated boron mud, in the pretreated boron mud, the mass percentage of magnesium oxide is 52.8%, which is called Add 30L of sulfuric acid solution with a mass concentration of 50% into the reactor, that is, the mass ratio of boron mud to pure sulfuric acid is 1:2.09. The reaction temperature was 90° C., and the reaction was carried out for 2 hours under the condition that the stirring speed was 400 r / min. The reaction produced an acidified slurry containing 30.72 kg of magnesium sulfate hydrate.

[0029] The acidified slurry of the hydrate of magnesium sulfate is suction-filtered under reduced pressure, a...

Embodiment 2

[0032] A kind of method adopting boron mud to prepare anhydrous magnesium sulfate, comprises the steps:

[0033] Take 10kg of boron mud and wash it with hot water at 80°C to remove B 2 o 3 , after drying, activated and calcined at 600° C. for 90 minutes, ground and pulverized, and magnetically separated to remove iron to obtain pretreated boron slime. In the pretreated boron slime, the mass percentage of magnesium oxide was 52.8%. Add the pretreated boron mud and 40L sulfuric acid solution with a mass concentration of 40% into the reactor, that is, the pure mass ratio of boron mud to sulfuric acid is 1:2.08. The reaction temperature was 80° C., and the reaction was carried out for 2 hours under the condition that the stirring speed was 300 r / min. The reaction produced an acidified slurry containing 30.13 kg of magnesium sulfate hydrate.

[0034] The acidified slurry of the hydrate of magnesium sulfate is suction-filtered under reduced pressure, and the obtained acid leachin...

Embodiment 3

[0037] A kind of method adopting boron mud to prepare anhydrous magnesium sulfate, comprises the steps:

[0038] Take 10kg of boron mud and wash it with hot water at 80°C to remove B 2 o 3 , after drying, activated and calcined at 600°C for 120min, after grinding and pulverizing, magnetic separation treatment to remove iron to obtain pretreated boron slime, in the pretreated boron slime, the mass percentage of magnesium oxide was 52.8%. The pretreated boron mud and 40L of sulfuric acid solution with a mass concentration of 50% are added to the reactor, that is, the pure mass ratio of boron mud to sulfuric acid is 1:2.78. The reaction temperature was 90° C., and the reaction was carried out for 1.5 hours at a stirring speed of 300 r / min. The reaction produced an acidified slurry containing 30.91 kg of magnesium sulfate hydrate.

[0039] The acidified slurry of the hydrate of magnesium sulfate is suction-filtered under reduced pressure, and the obtained acid leaching filtrate...

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Abstract

The invention discloses a method for preparing magnesium salt from boric sludge, and belongs to the technical field of inorganic chemical waste treatment and comprehensive utilization. The method comprises the following steps: cleaning the boric sludge to remove boron, drying, activating, grinding and crushing, and carrying out magnetic separation treatment to remove iron, so as to obtain pretreated boric sludge; and leaching by using strong acid to obtain a solution formed by sulfide/chloride, and cooling, crystallizing and filtering to obtain magnesium salt crystals, so that the purity of the product is higher. According to the present invention, the boric sludge is converted from the industrial waste material into the high value-added magnesium salt, the magnesium element in the boric sludge is extracted, the technology is the treatment and utilization of the boric sludge waste material, the anhydrous magnesium sulfate/magnesium chloride hexahydrate is prepared, the chemical solids are treated, the environmental requirements are met, and the economic benefits are increased for enterprises. Compared with an existing method for extracting magnesium in the boric sludge, activation and magnetic separation are matched, and the acid utilization rate and the magnesium leaching rate can be increased.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical waste management and comprehensive utilization, in particular to a method for preparing magnesium salt by using boron mud. Background technique [0002] Borax mud is solid waste produced in the process of producing boric acid and borax. Domestic raw materials are mostly taken from low-grade metamorphic sedimentary boron deposits, and borax is produced by carbon-soda method (Na 2 B 4 o 7 10H 2 (2), after washing, crystallization process extracts borax, a large amount of solid waste---boror mud will remain. The production of 1 ton of borax can produce 3 to 4 tons of boron mud. Boron mud is alkaline. Due to the large discharge of boron mud, stockpiling and disposal will occupy a large amount of land, and will pollute land and water resources. cause damage to the ecological environment. At present, a variety of comprehensive utilization methods are adopted in China. In addition to bein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
CPCC01F5/40C01P2006/80
Inventor 宁志强王立杰刘家辉谢宏伟宋秋实尹华意
Owner NORTHEASTERN UNIV
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