Method for recycling stainless steel neutral salt electrolysis waste solution

A technology of electrolyzing waste liquid and neutral salt, which is applied in the field of environmental technology and resource recovery, and can solve the problems of unrecoverable nickel ions and low sludge utilization value, and achieve the effect of low resources and simple process

Active Publication Date: 2011-06-15
SHANGHAI LIGHT IND RES INST
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Problems solved by technology

Although this method can recycle the electrolyte, it will produce sludge containing a mixture of three metal hydroxides, which results in additiona

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  • Method for recycling stainless steel neutral salt electrolysis waste solution
  • Method for recycling stainless steel neutral salt electrolysis waste solution
  • Method for recycling stainless steel neutral salt electrolysis waste solution

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Embodiment Construction

[0021] The invention provides a recycling method for stainless steel neutral salt electrolysis waste liquid. One aspect of the method is to extract nickel ions from the waste liquid to achieve the purpose of recycling. To achieve this, it is necessary to first remove the waste liquid Interference from other metal ions. On the other hand, since waste liquid (mainly refers to the solution containing electrolyte) needs to be reused, it is necessary to ensure that no new impurities are introduced into the process of the method.

[0022] The analysis and detection results of the stainless steel neutral salt electrolysis waste liquid show that the main metal ion in the stainless steel neutral salt electrolysis waste liquid is Fe 2+ , Fe 3+ , Ni 2+ , Cr 3+ , and the rest are electrolytes (Na 2 SO 4 ). The pH value of the electrolytic waste solution varies greatly, generally in the range of 2-6. Because of the difference in pH value, the content of metal ions is also very diffe...

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Abstract

The invention relates to a method for recycling stainless steel neutral salt electrolysis waste solution. The electrolysis waste solution contains partial or all of nickel ions, ferrous ions, ferric ions and chromium ions, and sodium sulfate. In the method, an oxidation step is performed on the electrolysis waste solution, so that the ferrous ions in the waste solution are oxidized into ferric ions, wherein the oxidation step does not introduce new ions into the waste solution. After the pH value of the waste solution is regulated to a preset value of between 4.8 and 5.2, the waste solution is fed into a solid-liquid separation device, and the ferric ions and the chromium ions in the waste solution form sediments in the solid-liquid separation device. The supernate in the solid-liquid separation device is delivered to an ion exchange device for ion exchange, nickel therein is extracted, and finally, the liquid discharged after the ion exchange is returned to an electrolyte storage tank. The method can simultaneously reclaim the nickel metal and the electrolysis waste solution in a simple mode.

Description

technical field [0001] The invention relates to the fields of environmental technology and resource recovery, in particular to a recycling method for stainless steel neutral salt electrolysis waste liquid. 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 pollut...

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Application Information

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IPC IPC(8): C02F1/72C02F9/04C02F1/42
Inventor 傅坚亮
Owner SHANGHAI LIGHT IND RES INST
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