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Polishing waste acid regeneration method

A waste acid and sulfuric acid technology, applied in chemical instruments and methods, ion exchange column/bed methods, special treatment targets, etc., can solve problems such as troublesome post-processing, and achieve the effects of easy operation, improved removal rate, and high economic benefits.

Active Publication Date: 2020-08-14
宁波三达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cryolite produced by this method is gelatinous, and the post-processing is very troublesome.

Method used

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  • Polishing waste acid regeneration method

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Experimental program
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Effect test

Embodiment 1

[0028] The regeneration method of the polishing waste acid of the present embodiment comprises the following steps:

[0029] (1) Filled resin column

[0030] 800gYK-20 color-changing resin a, 1200gD001-CC type cation exchange resin b, 1000g001×4 gel-type strongly acidic styrene-based cation exchange resin c are filled in the glass column 1 successively from bottom to top; The liquid end and the lower end are the liquid outlet;

[0031] (2) Waste acid passes through resin column

[0032] 100g of waste acid with a mass fraction of aluminum ions of 1.5% is input from the liquid inlet and outlet of the glass column 1, and the acid solution flowing out from the resin column has a mass fraction of aluminum ions of 0.06%, and the removal rate of aluminum ions is 96%;

[0033] (3) Compounding of polishing acid

[0034] Add nitric acid and sulfuric acid to the acid solution after the resin column treatment, the total addition of nitric acid and sulfuric acid is 5g (sulfuric acid: ni...

Embodiment 2

[0042] The regeneration method of the polishing waste acid of the present embodiment comprises the following steps:

[0043] (1) Filled resin column

[0044] In the glass column 1, 700gYK-20 color-changing resin a, 2000gD001-CC type cation exchange resin b, 1000g001×4 gel type strongly acidic styrene-based cation exchange resin c are filled successively from bottom to top; The liquid end and the lower end are the liquid outlet;

[0045] (2) Waste acid passes through resin column

[0046] 80g of waste acid with a mass fraction of aluminum ions of 3% is input from the liquid inlet and output of the glass column 1; the mass fraction of aluminum ions flowing out from the resin column is 0.03%, and the removal rate of aluminum ions is 98%;

[0047] (3) Compounding of polishing acid

[0048] Add nitric acid and sulfuric acid to the acid solution after the resin column treatment, the total addition of nitric acid and sulfuric acid is 7g (sulfuric acid: nitric acid=2:1) ​​to obtain...

Embodiment 3

[0052] The regeneration method of the polishing waste acid of the present embodiment comprises the following steps:

[0053] (1) Filled resin column

[0054] In the glass column 1, 500gYK-20 color-changing resin a, 1300gD001-CC type cation exchange resin b, 1000g001×4 gel-type strongly acidic styrene-based cation exchange resin c are filled successively from bottom to top; The liquid end and the lower end are the liquid outlet;

[0055] (2) Waste acid passes through resin column

[0056] 80g of waste acid with a mass fraction of aluminum ions of 0.5% is input from the liquid inlet and outlet of the glass column 1, and the acid solution flowing out from the resin column has a mass fraction of aluminum ions of 0.02%, and the removal rate of aluminum ions is 98%;

[0057] (3) Compounding of polishing acid

[0058] Add nitric acid and sulfuric acid in the acid solution after resin column treatment, the total addition of nitric acid and sulfuric acid is 2g (sulfuric acid: nitric...

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Abstract

The invention relates to a polishing waste acid regeneration method which comprises the following steps: 1, filling a resin column, and sequentially filling a glass column with YK-20 color-changing resin, D001-CC type cation exchange resin, and 001*4 gel type strong-acid styrene series cation exchange resin from bottom up, wherein the upper end of the glass column is a liquid inlet end, and the lower end of the glass column is a liquid outlet end; 2, enabling waste acid to pass through the resin column; 3, compounding polishing acid; and 4, eluting the resin column. The YK-20 color-changing resin has higher adsorption limit and lower adsorption capacity; the 001*4 gel type strong-acid styrene series cation exchange resin has lower adsorption limit and higher adsorption capacity; the adsorption limit and the adsorption capacity of the D001-CC type cation exchange resin are between those of the YK-20 color-changing resin and the 001*4 gel type strong-acid styrene series cation exchange resin; and through top-bottom gradient adsorption, the aluminium ion removal rate can be increased to 95% or above, resin can be recycled through simple elution, operation is convenient, and the economic benefit is high.

Description

technical field [0001] The invention relates to the technical field of waste acid regeneration, in particular to a regeneration method of polishing waste acid. Background technique [0002] At present, for the polishing of aluminum and aluminum alloy products, it mainly relies on tri-acid polishing acid for processing. Tri-acid polishing acid is based on phosphoric acid, and sulfuric acid and nitric acid are added in a certain proportion. After the polishing acid is used many times, the content of aluminum ions in the acid will become higher and higher, which will seriously affect the polishing effect. If the waste acid is directly treated as the three wastes, it will bring great pressure to environmental protection. Therefore, for the removal of aluminum ions in the polishing waste acid, recycling has become a new research topic. [0003] There are documents (Hydrometallurgy of China, Vol.29No.3 (Sum.115).2009) report that add a certain proportion of sodium hydroxide and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F3/03C02F1/42B01J47/02B01J49/60
CPCC23F3/03C02F1/42B01J47/02B01J49/60C02F2001/425C02F2303/16
Inventor 陈亚刚周国权
Owner 宁波三达化工有限公司
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