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A method for treating naphthoquinone production waste liquid containing hexavalent chromium and vitamin K3 production waste water and co-producing chromium oxide green

A technology for the production of wastewater and chromium oxide green, which is applied in chromium oxide/hydrate, chemical instruments and methods, multi-stage water/sewage treatment, etc., and can solve problems such as high treatment costs, water pollution, and high chemical oxygen demand

Active Publication Date: 2015-09-02
绵阳市安剑皮革化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to organic matter and SO in wastewater 3 2- The high content makes the chemical oxygen demand (COD) of the wastewater higher, and its value is generally 20-200g / L, so it cannot meet the direct discharge requirements of industrial wastewater
With the continuous generation of production wastewater and the difficulty and high cost of high-salt organic wastewater treatment, if effective disposal measures are not taken, water pollution will be seriously brought about, which will restrict the normal development of the industry

Method used

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  • A method for treating naphthoquinone production waste liquid containing hexavalent chromium and vitamin K3 production waste water and co-producing chromium oxide green

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The hexavalent chromium content is expressed as Na 2 Cr 2 o 7 Be counted as 104g / L and sulfuric acid content is 1000ml naphthoquinone production waste liquid and COD is 25g / L and pH is 3.5 500ml vitamin K3 production waste water is added in the pressure reactor, under stirring, the gained reaction mixture is heated at 150 ℃ and 0.3MPa for 0.5h to carry out the redox reaction.

[0048] After the reaction, 39 g of sodium metabisulfite was added to the feed liquid by lowering the temperature and pressure to convert all unreduced hexavalent chromium in the feed liquid into trivalent chromium. Then, adjust feed liquid pH to 7.0 with sodium hydroxide, obtain intermediate product Cr(OH) 3 Precipitate, then carry out suction filtration, obtain filter cake and filtrate. The COD of the filtrate was 80 mg / L, and the hexavalent chromium content was 4.9 mg / L.

[0049] Put the separated filter cake into a high-temperature furnace and calcinate at 900°C for 2 hours, then quickly ...

Embodiment 2

[0051] The hexavalent chromium content is expressed as Na 2 Cr 2 o 7 Be counted as 87g / L and sulfuric acid content is 1000ml naphthoquinone production waste liquid and COD is 20g / L and pH is 1.0 500ml vitamin K3 production waste water is added in the pressure reactor, under stirring, the gained reaction mixture is heated at 180 ℃ and 0.5MPa for 2h to carry out the redox reaction.

[0052] After the reaction, 35.3 g of sodium metabisulfite was added to the feed liquid at lower temperature and pressure, to convert all unreduced hexavalent chromium in the feed liquid into trivalent chromium. Then, adjust feed liquid pH to 6.5 with sodium hydroxide, obtain intermediate product Cr(OH) 3 Precipitate, then carry out suction filtration, obtain filter cake and filtrate. The COD of this filtrate is 50 mg / L, and the hexavalent chromium content is 3.1 mg / L.

[0053] Put the separated filter cake into a high-temperature furnace and calcinate at 950°C for 1 hour, then quickly place it ...

Embodiment 3

[0055] The hexavalent chromium content is expressed as Na 2 Cr 2 o 7 Be counted as 118g / L and sulfuric acid content is 5000ml naphthoquinone production waste liquid and COD is 180g / L and pH is 0.6 500ml vitamin K3 production waste water is added in the pressure reactor, under stirring, the gained reaction mixture is heated at 100 Keep at ℃ and 3MPa for 3.5h to carry out redox reaction.

[0056] After the reaction, 108 g of sodium metabisulfite was added to the feed liquid by lowering the temperature and pressure to convert all unreduced hexavalent chromium in the feed liquid into trivalent chromium. Then, adjust feed liquid pH to 6.0 with sodium hydroxide, obtain intermediate product Cr(OH) 3 Precipitate, then carry out suction filtration, obtain filter cake and filtrate. The COD of this filtrate is 125 mg / L, and the hexavalent chromium content is 4.2 mg / L.

[0057] Put the separated filter cake into a high-temperature furnace and calcinate at 450°C for 4 hours, then quic...

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Abstract

The invention relates to a method for treating naphthoquinone production liquid waste containing hexavalent chromium and vitamin K3 production wastewater and co-producing chromium oxide green. The method comprises the following steps: a) carrying out liquid phase reaction between the naphthoquinone production liquid waste and the vitamin K3 production wastewater at 80-260 DEG C, wherein the naphthoquinone production liquid waste is excessively used relative to a necessary dosage of complete reduction; b) adding a reducing agent into the obtained reaction mixture to reduce the residual hexavalent chromium; c) regulating the pH of the obtained reaction mixture to 5.5-8.5 to separate out chromium hydroxide, and separating to obtain the chromium hydroxide and filtrate; and d) transforming the chromium hydroxide obtained in the step c) into chromium oxide green. The method can be used for effectively treating the naphthoquinone production liquid waste and the vitamin K3 production wastewater generated in a vitamin K3 production chain and recycling effective components in the liquid waste to turn waste into wealth and improve the economic and environmental protection benefits at the same time.

Description

technical field [0001] The invention relates to a method for treating naphthoquinone production waste liquid containing hexavalent chromium and vitamin K3 production waste water and co-producing chromium oxide green. Background technique [0002] The production process of chromium oxide and chromium hydroxide is introduced in detail in the book "Production and Application of Chromium Compounds". Among them, there are many production processes of chromium trioxide, and the thermal decomposition of sodium dichromate and ammonium sulfate is used for large-scale production. method, chromium hydroxide method, chromic anhydride thermal decomposition method; smaller-scale methods include potassium dichromate sulfur reduction method, ammonium dichromate thermal decomposition method, sodium dichromate carbon reduction method, chromium chloride oxidation method, etc. [0003] In the production process of feed additive vitamin K3, the intermediate 2-methyl-1,4-naphthoquinone is usually...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/02C02F9/10
Inventor 李先荣陈宁董明甫谢友才黄玉西
Owner 绵阳市安剑皮革化工有限公司