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Method for recycling nickel and chromium in stainless steel

A technology of stainless steel and ph value, applied in the direction of improving process efficiency, etc., can solve environmental pollution and other problems, achieve the effect of simple operation, low production cost, and realization of economic value

Inactive Publication Date: 2017-03-15
张圆圆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, these wastewaters are discharged directly, seriously polluting the environment

Method used

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Embodiment Construction

[0015] The principles and features of the present invention are described below in combination, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0016] A method for recycling nickel and chromium in stainless steel, comprising the following steps:

[0017] A beating process: the stainless steel pickling wastewater is treated, and the sludge containing heavy metal chromium and nickel is sent to the slurry tank, and water is added for beating. The mass ratio of sludge to water is 1:3, and the beating time is 1.5 hours;

[0018] B Acid leaching process: pump the rough raw material slurry after beating into the acid-dissolving tank, add concentrated HCl to adjust the pH value to 1.8-2.2, and soak for 3 hours;

[0019] C Separation process: add distilled water to the crude raw material slurry soaked in acid, inject the obtained waste water into the solid-liquid separation device for solid-liquid se...

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Abstract

The invention relates to a method for recycling nickel and chromium in stainless steel. The method comprises the following steps: treating nickel and chromium in stainless steel to generate sludge containing heavy metal chromium and nickel, feeding the sludge into a slurry pool, adding water, and pulping for 1.5 hours; pumping coarse raw material pulp obtained after pulping into an acid soluble pool, and adding concentrated HCl to adjust the pH value; adding distilled water in the coarse raw material pulp soaked in acid, injecting obtained waste water into a solid-liquid separation device for solid-liquid separation, and forming sediments by iron ions and chromium ions in the waste water in the solid-liquid separation device; pouring liquid out, and adjusting the pH value to obtain reaction liquid; filtering the sediments in the reaction liquid, taking the liquid and then injecting the liquid into an ion exchange unit for ion exchange to extract the nickel; and returning liquid outputted through ion exchange to a storage tank. Compared with the prior art, the method realizes resource recycling of precious metal in sludge and has comprehensive benefits including economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention relates to a method for recycling nickel and chromium in stainless steel. Background technique [0002] Stainless steel is known as a fine steel product. With its superior corrosion resistance, unique surface and excellent processing performance, it has developed very rapidly and its application fields have become wider and wider. The pickling of stainless steel strip is a key process in the production of cold-rolled stainless steel, which plays a decisive role in ensuring the surface quality of the product. The pickling process has also developed from pure chemical pickling in the 1960s and 1970s to the current combination of chemical pickling and electrolytic pickling. Wastewater containing heavy metals nickel and chromium will be produced in stainless steel pickling. Traditionally, these wastewaters are discharged directly, seriously polluting the environment. [0003] According to the treatment status of the heavy metal-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B34/32
CPCC22B7/007C22B23/0415C22B23/0453C22B23/0461C22B34/32Y02P10/20
Inventor 张圆圆
Owner 张圆圆
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