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Chlorination residue pulping wastewater comprehensive treatment method

A comprehensive treatment and chlorinated slag technology, applied in the direction of multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of consumption, low economic value, high treatment cost, etc.

Inactive Publication Date: 2018-10-19
LOMON BILLIONS GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concentration and crystallization process requires a large amount of energy, high processing costs, and low economic value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] temperature ℃

[0021] The impurity Al contained in it is removed by sodium dihydrogen phosphate, and Fe and Ni are removed by sodium sulfide. Phosphate and sulfide are not allowed to remain in chlor-alkali production, so they are carried out simultaneously with the main reaction, and the residual reaction can be taken away during solid-liquid separation. Phosphates and sulfides. In the crude brine after solid-liquid separation, Mg and Ca still exceed the standard, and further treatment is required. Use FeCl3 to remove excess Mg, Na2CO3 to remove excess Ca, and reuse it after reaching the standard.

[0022] The required reagent dosage and the obtained saline index are as follows:

[0023] Reagent name

[0024] Element

[0025] The main component of white gypsum is calcium sulfate, followed by sodium chloride. It contains less impurities and can be recycled.

[0026] The required reagent dosage and the obtained saline index are as follows: ...

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Abstract

The invention relates to a chlorination residue pulping wastewater comprehensive treatment method, which comprises the following steps that 1, excessive sodium sulfate is added into calcium chloride wastewater generated during the titanium dioxide preparation by a chlorination process; after the reaction, filtering is performed; white gypsum and crude brine water are obtained; 2, BaCl2 is added into the crude brine water; the SO4<2-> content in the crude brine is regulated to be 3 to 5g / L; according to the contents of Ca<2+>, Ba<2+> and Sr<2+> in the crude brine, the corresponding quantity ofBaCl2 and Na2CO3 is added for reaction; then, precipitates are separated out; finished product brine is obtained; 3, the finished product brine is used as primary brine in chlorine-alkali chemical engineering. The calcium chloride wastewater and the chlorine-alkali plant by-product of mirabilite are comprehensively treated; the environment pollution and the environment protection pressure can be reduced; the treatment cost is low; great economic benefits can be produced.

Description

technical field [0001] The invention specifically relates to a method for comprehensive treatment of chlorinated slag beating wastewater, and belongs to the technical field of wastewater recovery and treatment. Background technique [0002] With the development of industry and the increasingly severe environmental problems, the trend of the titanium dioxide industry in the world today is that the titanium dioxide produced by the chloride process continues to develop, and the titanium dioxide produced by the sulfuric acid process is gradually shrinking and eliminated. [0003] Compared with sulfuric acid titanium dioxide production, the chlorination method has the advantages of short process flow, easy operation to realize continuous automation, less discharge of "three wastes", and easier access to high-quality rutile titanium dioxide, thus gradually occupying the global titanium dioxide industry. leading position. Due to the increasingly strengthening of environmental prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46C02F101/12
CPCC01F11/46C02F1/001C02F1/58C02F9/00C02F2101/12C02F2301/08
Inventor 刘红星陈建立豆君牛萌王松波王嘉雍贺高峰李永海
Owner LOMON BILLIONS GRP CO LTD
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