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Method for realizing waste acid resourceful treatment through resin adsorption

A resin adsorption and recycling technology, applied in chemical instruments and methods, adsorption water/sewage treatment, special treatment targets, etc., can solve the problems of acid recycling, low investment, secondary pollution, etc., and reduce equipment investment costs. , the effect of reducing facilities, reducing construction period and workload

Inactive Publication Date: 2020-05-22
苏州博睿特环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, neutralization method is mostly used for on-site waste acid treatment. The process is simple and the investment is low, but the effective acid in the waste acid cannot be recycled, and a large amount of metal sludge is produced at the same time, causing secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Pack 20ml of acid retarding resin into an adsorption column (￠35×250mm) with insulation jacket. Take waste acid with an acidity of 15%, filter it as the upper column liquid, and pass it through the resin column at a flow rate of 15BV / h at a temperature of 20°C. When the acid content in the effluent is below 5%, the treatment capacity is 0.65BV. After the resin is adsorbed and saturated, it is desorbed with soft water at a temperature of 20°C and a flow rate of 15BV / h. The effective acid content of the desorption solution reaches 18%, and it can be returned to the pickling line to be used with new acid.

Embodiment 2

[0026] Pack 20ml of acid retardation resin into an adsorption column (￠35×250mm) with insulation jacket. Take waste sulfuric acid with an acidity of 20%, filter it as the upper column liquid, and pass it through the resin column at a flow rate of 12BV / h at a temperature of 20°C. When the acid content in the effluent is below 5%, the treatment capacity is 0.45BV. After the resin is adsorbed and saturated, it is desorbed with soft water at a temperature of 20°C and a flow rate of 15BV / h. The effective acid content of the desorption liquid reaches 20%, which can be returned to the production line for use.

Embodiment 3

[0028] Pack 20ml of acid retardation resin into an adsorption column (￠35×250mm) with insulation jacket. Take the mixed waste acid of hydrofluoric acid and nitric acid with an acidity of 18%, filter it as the upper column liquid, pass it through the resin column at a flow rate of 12BV / h at a temperature of 20°C, and when the acid content in the effluent is below 5% The processing volume is 0.55BV. After the resin is adsorbed and saturated, it is desorbed with soft water at a temperature of 20°C and a flow rate of 12BV / h. The effective acid content of the desorption liquid reaches 16%, and the recovered acid can be returned to the production line for use.

[0029] Using the invention to treat waste acid, the acid content in the waste acid is reduced from 15% to 20% before treatment to less than 5% after treatment; after adsorption, the resin is desorbed and regenerated with soft water, and the effective acid content of the desorption liquid reaches 16% to 20%.

[0030] By usi...

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PUM

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Abstract

The invention provides a method for realizing waste acid resourceful treatment through resin adsorption. The method comprises the following steps: carrying out filtering pretreatment on waste acid; and under the conditions that the temperature is 10-40 DEG C and the flow rate is 10-15 V / h, carrying out forward flow adsorption through a device filled with an adsorption resin or ion exchange resin,wherein the content of the acid in the adsorbed effluent is reduced to be lower than 5% from 20%, the resin can be completely regenerated by soft water after adsorption, and the effective acid in theregenerated liquid can be recycled. By adopting the method to treat waste acid, more than 80% of the effective acid in the waste acid is separated and recycled, a guarantee is provided for subsequentdeep standard treatment of the wastewater, and waste recycling is realized while the waste acid is treated.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for recycling waste acid by resin adsorption. Background technique [0002] Inorganic acid is widely used as cleaning agent, corrosive agent or catalyst in metallurgy, machinery, chemical industry and other industries. When pickling steel and metal surfaces, the steel is generally immersed in a pickling tank with a concentration of 20% for cleaning. As the pickling progresses, the acid concentration gradually decreases, and the ferrous ion concentration in the pickling solution continues to increase. H in pickling tank 2 SO 4 The concentration is reduced to 6% ~ 8%, or FeSO 4 When the concentration of the acid exceeds 200~250g / L, the pickling speed decreases, and the pickling solution must be replaced, resulting in waste acid. [0003] According to the "National Hazardous Waste List", waste acid produced during the production, sale and use of refined petroleum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/42
CPCC02F1/28C02F1/42C02F2303/16
Inventor 蔡建国石洪雁王冰
Owner 苏州博睿特环保科技有限公司
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