A kind of regeneration method of polishing waste acid

A waste acid and sulfuric acid technology, applied in chemical instruments and methods, ion exchange column/bed methods, ion exchange water/sewage treatment, etc., can solve problems such as post-processing troubles, and achieve easy operation, high economic benefits, and improved removal rate effect

Active Publication Date: 2022-02-22
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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  • A kind of regeneration method of polishing waste acid
  • A kind of regeneration method of polishing waste acid

Examples

Experimental program
Comparison scheme
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 regeneration method of polishing waste acid, comprising the following steps: (1) filling a resin column, filling the glass column with YK-20 discoloration resin, D001-CC type cation exchange resin, 001×4 Gel-type strongly acidic styrene-based cation exchange resin, the upper end of the glass column is the liquid inlet end, and the lower end is the liquid outlet end; (2) waste acid passes through the resin column; (3) polishing acid compounding; (4) resin Column elution. YK‑20 color-changing resin of the present invention has higher adsorption limit and lower adsorption capacity, 001×4 gel-type strongly acidic styrene-based cation exchange resin has lower adsorption limit and higher adsorption capacity, and D001 ‑CC type cation exchange resin’s adsorption capacity and adsorption limit are between the two. After the gradient adsorption from top to bottom, it can effectively improve the removal rate of aluminum ions, so that the removal rate of aluminum ions can reach more than 95%. Simple elution can be recycled, easy to operate and high economic benefit.

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 Patents(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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