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Resourceful treatment method for chrome tanning waste liquid

A processing method and a resource-recycling technology, applied in the field of light industry and environmental protection, can solve the problems of low recovery efficiency of hexavalent chromium, and achieve the effect of improving recovery efficiency

Active Publication Date: 2022-06-24
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The main purpose of the present invention is to provide a recycling treatment method for chrome tanning waste liquid, which is used to solve the technical problem of low recovery efficiency of hexavalent chromium in the existing chrome tanning waste liquid, so as to improve the recovery efficiency of hexavalent chromium in chrome tanning waste liquid technical effect

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) After the chrome tanning waste liquor is pretreated by plate and frame filtration to remove solid impurities, the Cr in the chrome tanning waste liquor is determined by the sodium chromate colorimetric method. 2 O 3 The content is 1.1g / L, the content of neutral salt sodium chloride is 53.8g / L, pH=4.1.

[0060] (2) Send 500L of the chrome tanning waste liquid to a volume of 1m 3 In the oxidation treatment device, add 7.15kg to 8.8kg of potassium persulfate to the oxidation treatment device, stir and dissolve evenly.

[0061] (3) Continuously feed high-temperature steam into the oxidation treatment device under stirring conditions, until the temperature of the reaction solution reaches 40-43 o C, the reaction solution is allowed to flow and mix back and forth in the oxidation treatment device under stirring; the oxidation treatment device has a sealed and waterproof UVA type ultraviolet lamp array, with a temperature of 200 μW / cm 2 The intensity of ultraviolet ligh...

Embodiment 2

[0066] (1) After the chrome tanning waste liquor is pretreated by plate and frame filtration to remove solid impurities, the Cr in the chrome tanning waste liquor is determined by the sodium chromate colorimetric method. 2 O 3 The content is 2.8g / L, the content of neutral salt sodium chloride is 58.4g / L, pH=3.9.

[0067] (2) Send 500L of the chrome tanning waste liquid to a volume of 1m 3 In the oxidation treatment device, add 9.4 kg to 11.2 kg of potassium persulfate to the oxidation treatment device, stir and dissolve evenly.

[0068] (3) Continuously feed high-temperature steam into the oxidation treatment device under stirring conditions, until the temperature of the reaction solution reaches 40-43 o C, the reaction solution is allowed to flow and mix back and forth in the oxidation treatment device under stirring; the oxidation treatment device has a sealed and waterproof UVA type ultraviolet lamp array, with a temperature of 200 μW / cm 2 The intensity of ultraviolet li...

Embodiment 3

[0073] (1) After the chrome tanning waste liquor is pretreated by plate and frame filtration to remove solid impurities, the Cr in the chrome tanning waste liquor is determined by the sodium chromate colorimetric method. 2 O 3 The content is 6.5g / L, the content of neutral salt sodium chloride is 76g / L, pH=4.2.

[0074] (2) Send 500L of the chrome tanning waste liquid to a volume of 1m 3 In the oxidation treatment device, add 21.1 kg to 26 kg of potassium persulfate to the oxidation treatment device, stir and dissolve evenly.

[0075] (3) Continuously feed high-temperature steam into the oxidation treatment device under stirring conditions, until the temperature of the reaction solution reaches 40-43 o C, the reaction solution is allowed to flow and mix back and forth in the oxidation treatment device under stirring; the oxidation treatment device has a sealed and waterproof UVA type ultraviolet lamp array, with a temperature of 200 μW / cm 2 The intensity of ultraviolet light...

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Abstract

The invention discloses a chrome tanning waste liquid resourceful treatment method, and relates to the technical field of light industry environmental protection. According to the chrome tanning waste liquid resourceful treatment method, the chrome tanning waste liquid is creatively oxidized into dichromate under the acidic condition, trivalent chromium ions in the chrome tanning waste liquid can be efficiently and rapidly oxidized into hexavalent chromium ions, and the hexavalent chromium ions are applied to fur chrome mordant dyeing after excessive oxidizing agent removal, component detection and component adjustment; therefore, chromium, sodium chloride neutral salt and water in the chrome tanning waste liquid are efficiently recycled, and meanwhile, the recovery efficiency of hexavalent chromium in the chrome tanning waste liquid is improved.

Description

technical field [0001] The invention relates to the technical field of light industry environmental protection, in particular to a method for recycling chrome tanning waste liquor. Background technique [0002] Chrome tanning is one of the important processes in fur processing. The fur tanned with chrome salts has a plump, soft and elastic feel, and has high shrinkage temperature and good mechanical properties, which can ensure that the fur skin can be dyed and finished at high temperatures. Non-returning tanning, non-shrinking board, its comprehensive performance still can not be replaced by other tanning agent tanning leather. [0003] However, in the process of fur tanning, the liquid ratio is large and the absorption rate of chromium is low, generally only 60% to 70%, and the remaining 30% to 40% of chromium remains in the waste liquid, which makes the content of chromium in the discharged waste liquid as high as 2000~ 5000mg / L (in Cr 2 O 3 Such a high content of chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/32C02F101/22C02F103/22
CPCC02F1/722C02F1/32C02F2101/22C02F2103/22Y02W30/50
Inventor 陈晟鸿王亚平王佳君张广源赵金腾楼启帆李平轩吴沈菲
Owner JIAXING UNIV
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