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Method for comprehensively utilizing waste acid and waste alkali for producing high-purity magnesium sulfate

A technology of comprehensive utilization and waste sulfuric acid, applied in magnesium sulfate and other directions, to achieve the effects of less equipment investment, good application and promotion prospects, and simple process

Inactive Publication Date: 2012-05-30
四川金岸环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the filter residue is dried, it is sent to the cement plant to be used as a doping material

Method used

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  • Method for comprehensively utilizing waste acid and waste alkali for producing high-purity magnesium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Adjust the concentration of waste sulfuric acid to 20% and add it into the mixed slurry of serpentine powder and water, stir and react for a period of time, and pump it into a plate and frame filter press for filtration. After the filter residue is dried, it is sent to the cement plant to be used as a doping material. The filtrate is neutralized with 8%-15% waste caustic soda solution to pH=7.5-8, and then the suspension is pumped into a plate and frame filter press for filtration. A part of the filtrate is used to prepare the mixed slurry of serpentine powder and water, a part is used to prepare caustic soda or sodium carbonate solution, and the rest is sent to the evaporator to be evaporated and concentrated for the by-product sodium sulfate. The filter residue is sent to the rotary calciner, and the residual organic matter in it is completely decomposed at a certain temperature. The decomposed material is cooled and sent to the acidolysis tank, and a certain amount ...

Embodiment 2

[0014] The waste sulfuric acid is adjusted to 20% and added to the mixed slurry of serpentine powder and water, stirred and reacted for a period of time, and then pumped into a plate and frame filter press for filtration. After the filter residue is dried, it is sent to the cement plant to be used as a doping material. The filtrate is neutralized to pH=7.5-8 with 10%-20% waste soda ash solution, and then the suspension is pumped into a plate and frame filter press for filtration. A part of the filtrate is used to prepare the mixed slurry of serpentine powder and water, a part is used to prepare caustic soda or sodium carbonate solution, and the rest is sent to the evaporator to be evaporated and concentrated for the by-product sodium sulfate. The filter residue is sent to the rotary calciner, and the residual organic matter in it is completely decomposed at a certain temperature. The decomposed material is cooled and sent to the acidolysis tank, and a certain amount of pure w...

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Abstract

The invention belongs to a comprehensive utilization and treating method of recovered industrial wastes. Specifically, the method comprises technologies that: serpentine powder is dissolved by using waste sulfuric acid; a precipitate is neutralized by using waste alkali; and the material is subject to other processes such as high-temperature decomposition, such that high-purity magnesium sulfate is obtained. When the method provided by the invention is implemented, a large quantity of waste sulfuric acid and waste alkali (liquid) produced by enterprises of pesticides, medicines and hydrazine hydrates can be consumed. Organics brought by the waste can be completely decomposed and removed in a rotary decomposing furnace. Heavy metals in the waste acid and alkali can be precipitated with a pH regulation method; the precipitate is filtered, and is used as a doping material in cement factories; residual SO4<2-> in the technology is combined with Na<+>, and a by product sodium sulfate can be produced through evaporative concentration. With the method, the content of produced magnesium sulfate product is higher than 99.5%. With the method, environmental pollution of related pollutant-discharging enterprises can be solved, and wastes can be effectively utilized. The method belongs to green and environment-friendly technologies, and is suitable for large-scale productions. The method has a good application and popularization prospect.

Description

technical field [0001] The invention belongs to an industrial comprehensive utilization and disposal method, and specifically relates to unit operations such as dissolving serpentine with waste acid, neutralizing and precipitating magnesium ions with waste alkali, and calcining and decomposing organic impurities substituted by waste acid and waste alkali to produce medicine, food and feed, etc. Process for high-purity magnesium sulfate used in industry. Background technique [0002] At present, my country's ethylene production enterprises, pesticide synthesis enterprises, and hydrazine hydrate manufacturers produce a large amount of waste sulfuric acid and waste alkali (liquid) every day. This kind of waste acid and alkali contains a certain amount of metal ions and soda ash in addition to sulfuric acid, caustic soda or soda ash. For the residual organic matter, these enterprises basically discharge it to the environment after neutralization and dilution. Such a disposal met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
Inventor 熊益均廖辉伟
Owner 四川金岸环保科技有限公司
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