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Magnesium sulfate heptahydrate production method utilizing waste sulfuric acid from production of cation exchange resin

A technology of cation exchange and waste sulfuric acid, applied in magnesium sulfate and other directions, can solve the problems of black color such as ink, increase the production cost of enterprises, difficult to find users, etc., to solve the problem of waste sulfuric acid treatment, no secondary pollution, and increase efficiency. Effect

Active Publication Date: 2013-06-05
宜宾市叙州区天源树脂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, almost all ion exchange resin enterprises in China are faced with the problem of how to deal with the waste sulfuric acid in the production of cation exchange resins. Many enterprises have used various means to increase the concentration of waste sulfuric acid as much as possible, so as to achieve the sales volume. purpose, but because the waste sulfuric acid after sulfonation reaction contains a large amount of carbides, the color is as black as ink, basically no customers are willing to accept it, even if it is given away, it is difficult to find users (except for local calcium magnesium phosphate fertilizer enterprises, such Enterprises can accept part to reduce fertilizer cost)
However, the cation exchange resin production enterprises adopting the current technology can recover less than 30% of the waste sulfuric acid that can be directly used no matter what means are adopted, and more than 70% of the dilute waste sulfuric acid needs to be neutralized with lye to meet emission standards
Because enterprises spend a lot of money on the treatment of waste sulfuric acid, which increases the production cost of enterprises, resin production is basically no profit after the waste acid is completely disposed of, so sneaking is the only choice for many enterprises, and many enterprises are Under the pressure of local environmental protection, enterprises were shut down
At the same time, the current cation exchange resin production enterprises do not produce sulfate by themselves with recycled waste sulfuric acid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0008] Embodiment: get concentration and be 50% waste sulfuric acid 1400kg to reaction tank, add 350kg magnesia and carry out mixed reaction, reaction time is 80 minutes, and after reaction, pH value is 6.5, and Baume concentration is 41.

[0009] Then add 5 kg of flocculant (polyacrylamide), stir, wait for the tiny carbides to flocculate into agglomerates and sink, then take the clear liquid to the crystallization tank, adjust the acid, make the whole solution crystallize under the condition of pH value 4, and then Send the crystallized magnesium sulfate heptahydrate into a centrifugal dehydrator to complete.

[0010] The applicant found in the initial exploration that the waste sulfuric acid produced in the production of cation exchange resins is very different from the waste sulfuric acid produced in other productions: except for carbides, it does not contain other metal ions and substances, which is very important. It is the premise that it can be used for magnesium sulfat...

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PUM

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Abstract

The invention relates to a magnesium sulfate heptahydrate production method utilizing waste sulfuric acid from production of a cation exchange resin. The method is characterized by comprising steps of: mixing magnesium oxide and waste sulfuric acid until a PH reaching 6-7 at a reaction terminal point; adding a flocculating agent into a mixed solution, stirring and standing; removing a supernatant liquid after flocculation, conglobating and sinking of minimal carbides; adding acid; crystallizing and removing free water to obtain a qualified magnesium sulfate product. The invention has beneficial effects that pioneering thinking is utilized to creatively select the waste sulfuric acid from production of the cation exchange resin to produce the magnesium sulfate product, and specific feasible operations and parameters are figured out through tests. On the one hand, a problem of waste sulfuric acid processing in the resin industry is solved; on the other hand, enterprise benefits are increased as well. In addition, the whole production process generates no secondary pollution or waste water.

Description

technical field [0001] The invention relates to a method for producing magnesium sulfate heptahydrate by using waste sulfuric acid, which is especially suitable for waste utilization in the resin industry. Background technique [0002] In the production process of cation exchange resin, the concentration of waste sulfuric acid produced after sulfonation reaction is between 45% and 75%, and its main component contains a large amount of carbides in addition to sulfuric acid, which are very small and cannot be separated by physical methods. . [0003] At present, almost all ion exchange resin enterprises in China are faced with the problem of how to deal with the waste sulfuric acid in the production of cation exchange resins. Many enterprises have used various means to increase the concentration of waste sulfuric acid as much as possible, so as to achieve the sales volume. purpose, but because the waste sulfuric acid after sulfonation reaction contains a large amount of ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
Inventor 邓江张巍
Owner 宜宾市叙州区天源树脂厂
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