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Recycling method for treating stainless steel pickling acid pickle and wastewater

A technology for pickling waste acid and waste water treatment, which is applied in the field of industrial waste acid and waste water treatment in the iron and steel and metallurgical industries. It can solve the problems of waste of environmental protection resources, water treatment and operation costs, etc., and achieve the improvement of relative abundance, significant economic and social benefits, and good effect

Active Publication Date: 2015-01-28
上海博士高环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The object of the present invention is to provide a resource utilization method for stainless steel pickling waste liquid and wastewater treatment, which solves the environmental protection problems, resource waste and water treatment operation cost problems existing in the existing stainless steel pickling process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Take nitric acid hydrofluoric acid mixed acid waste pickling waste liquid 1m 3 After testing, the concentration of nitric acid is 150g / L, hydrofluoric acid is 45g / L, and iron ion concentration is 45g / L. Add 100L of 98% concentrated sulfuric acid for vacuum distillation, and use graphite evaporator and condenser impregnated with polytetrafluoroethylene. , control waste acid evaporation boiling point temperature at 50-70 ℃, after condensation reclaims acid, after testing, nitric acid is 204Kg, and total nitric acid recovery rate is 92.3%, and hydrofluoric acid is 62Kg, and total hydrofluoric acid recovery rate is 93.9%.

Embodiment 2

[0071] Take sulfuric acid pickling waste 1m 3 After testing, the concentration of sulfuric acid is 180g / L, and the concentration of iron ions is 61g / L. The sulfuric acid of waste sulfuric acid liquid is reclaimed by resin exchange method. After measurement, 152Kg of sulfuric acid is reclaimed, the recovery rate of sulfuric acid is 84.4%, and the content of iron ions in the reclaimed sulfuric acid is 12Kg , The removal rate of metal ions is 80.3%. Raffinate 1.1m 3 , the iron ion concentration is 45.5g / L, and the sulfuric acid concentration is 25.5g / L.

Embodiment 3

[0073] Take stainless steel pickling waste sulfuric acid solution 1m 3 After testing, the sulfuric acid concentration was 180g / L, the iron ion concentration was 61.8g / L, the total chromium was 16.0g / L, the nickel ion was 6.7g / L, and the manganese ion was 0.72g / L. The concentration of lime emulsion used for water treatment is 10-15%, and the concentration of calcium nitrate is 20%.

[0074] Add the above-mentioned lime emulsion to pH=3.0±0.2 under stirring in the primary reaction tank, then quantitatively add 1400Kg of calcium nitrate solution with a concentration of 20%, and after one hour of reaction, dry the water with a filter press. The sludge volume is 962Kg, and the water content rate 50%. The concentration of each metal ion in the filtrate is: iron ion concentration 10.3g / L, total chromium 2.67g / L, nickel ion 1.12g / L, manganese ion 0.12g / L. Wash water 4m with sulfuric acid and nitric acid with pH=3.0±0.2 3 After washing once, press filter until the sludge contains 50...

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Abstract

The invention relates to a recycling method for treating stainless steel pickling acid pickle and wastewater, belonging to the field of treatment of industrial acid pickle and wastewater in iron and steel and metallurgy industries. The acid pickle and wash wastewater generated during stainless steel pickling are collected according to quality and category and the acid pickle is subjected to acid recycling. The acid pickle and wash wastewater are treated through fractional precipitation by adopting lime as a neutralizing agent. Calcium sulfate or calcium fluoride or a mixture of calcium sulfate and calcium fluoride is obtained through precipitation under the acidic condition (the pH value is equal to 3.0+ / -0.5) and can serve as a cement filler or a material for brickmaking or a building material after heavy metal polluted calcium salt is removed. A metal hydroxide is obtained through precipitation under the alkaline condition (the pH value is not more than 9.0) and can serve as a stainless steel smelting raw material as the quality of the product is better than that of the imported laterite-nickel ores in China. The calcium nitrate containing wastewater obtained after the acid pickle is treated is not needed to be discharged or treated and can be recycled. After being treated, the wash wastewater can be reused as production line wash water.

Description

technical field [0001] The present invention relates to a treatment method for metal surface treatment waste acid and waste water, more specifically to a resource utilization method for stainless steel pickling waste acid and waste water treatment, which belongs to the treatment of industrial waste acid and waste water in the iron and steel and metallurgical industries field. Background technique [0002] Stainless steel can be roughly classified according to its use, chemical composition and metallographic structure. Austenitic stainless steels are basically composed of 18% chromium-8% nickel, and the addition of each element changes differently to develop stainless steels for various purposes. [0003] Stainless steel is widely used in petroleum, chemical industry, power, nuclear engineering, aerospace, medical machinery, light industrial products, personal residential decoration, and high-end hotels because of its many advantages such as acid corrosion resistance, good h...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/52C02F1/66C02F9/00C02F2103/16C02F2103/26C02F2301/08C02F2305/023C02F2305/04
Inventor 徐超群陈云华
Owner 上海博士高环保科技有限公司
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