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Method for reclaiming nickel and chromium from stainless steel sludge

A recycling method, stainless steel technology, applied in the field of resource recycling in the environmental protection industry, can solve problems such as inability to treat environmental problems, secondary pollution, huge economic costs, etc., and achieve the effects of solving pollution problems, simple process methods, and universal industrial raw materials

Active Publication Date: 2008-08-06
SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional environmental protection treatment process, even if the pollutants produced by the wastewater plant can be treated cleanly, at the same time it will pay a huge economic price or produce secondary pollution, and ultimately the environmental problems cannot be effectively treated

Method used

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  • Method for reclaiming nickel and chromium from stainless steel sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 100g of stainless steel waste water sludge, place it in the first reaction tank, add 400g of clear water, and then add 12g of concentrated sulfuric acid to obtain a pH value of 2.0, filter after full reaction, remove the filter cake, and send 401g of the clear liquid to the second In two reaction tanks, add caustic soda 23g in the second reaction tank, the available pH value is 6.1, fully reacts. The reactants are then filtered, and the resulting filter cake is sent to the first reaction tank for recycling with the newly added sludge. Clear liquid is sent to ion exchange device again, carry out ion exchange, can obtain the solution 14g that contains nickel sulfate and the liquid 3g that contains chromium sulfate, through measuring: wherein the concentration of the solution that contains nickel sulfate is 60g / L, and the solution that contains chromium sulfate The concentration of the solution is 80g / L. The filtered solids in the accompanying drawings are the filter...

Embodiment 2

[0028] Operate in the manner of Example 1, place 100g of stainless steel wastewater sludge of different batches in the first reaction tank, add 400g of clear water, and then add 13g of concentrated sulfuric acid to obtain a pH value of 1.9, and filter after fully reacting , Remove the filter cake, send clear liquid 400g in the second reaction pool, add caustic soda 21g in the second reaction pool, the available pH value is 5.2, carry out sufficient reaction. The reactants are then filtered, and the resulting filter cake is sent to the first reaction tank for recycling with the newly added sludge. Clear liquid is sent to ion exchange device again, carries out ion exchange, can obtain the solution 16g that contains nickel sulfate and the liquid 4g that contains chromium sulfate, through measuring: wherein the concentration of the solution that contains nickel sulfate is 61g / L, and the solution that contains chromium sulfate The concentration of the solution was 82g / L.

Embodiment 3

[0030] Operate in the manner of Example 1, place 100g of stainless steel wastewater sludge of different batches in the first reaction tank, add 400g of clear water, and then add 11g of concentrated sulfuric acid to obtain a pH value of 2.7, and filter after fully reacting , Remove the filter cake, send clear liquid 403g in the second reaction tank, add caustic soda 20g in the second reaction tank, the available pH value is 4.8, fully react. The reactants are then filtered, and the resulting filter cake is sent to the first reaction tank for recycling with the newly added sludge. Clear liquid is sent to ion exchange device again, carry out ion exchange, can obtain the solution 18g that contains nickel sulfate and the liquid 5g that contains chromium sulfate, through measuring: wherein the concentration of the solution that contains nickel sulfate is 56g / L, and the solution that contains chromium sulfate The concentration of the solution was 74g / L.

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Abstract

The invention discloses a technique for reclaiming and utilizing resources in the environmental protection industry and in particular relates to a method for reclaiming and utilizing nickel and chrome in sludge which is produced in the process for treating stainless steel waste water. The method comprises: effectively separating the nickel and the chrome in the sludge from other different ions such as calcium, iron and the like through a salt mode, controlling the pH value through arranging a plurality of reaction pools and adding a certain amount of acid and alkali in each reaction pool, effectively separating each substance according to different solubility of inorganic compound, recycling and utilizing the filter cake which is produced from a second reaction pool for protecting the environment better and increasing the availability ratio of the heavy metal. The method has the advantages that the pollution problem of stainless steel production enterprises can be effectively solved, the cost which is spent for controlling pollution can be completely reclaimed due to the market value of the nickel and chromate salt through reclaiming the nickel and the chromate salt, and finally is available. The technique method is simple and the industrial raw material is common, which is suitable for widely extending and using.

Description

technical field [0001] The invention relates to a resource recycling technology belonging to the environmental protection industry, in particular to a method for recycling nickel and chromium in sludge generated in the stainless steel wastewater treatment process. technical background [0002] Heavy metals such as nickel and chromium are seriously harmful to nature and are seriously poisonous to humans and organisms. Under the action of the external environment, they may be transformed into more toxic compounds. Through the food chain and other methods, such heavy metals will enter the human body. Cause different degrees of poisoning, and ultimately endanger human health. Heavy metals cannot be degraded in water bodies, and tend to form sediments and accumulate in the sediment near the outfall, becoming a long-term secondary pollution source near the factory area and endangering future generations. Therefore, reducing the total discharge of harmful heavy metal elements in w...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/22C22B3/42C22B23/00C22B34/32
CPCY02P10/20
Inventor 陈启松
Owner SONGYANG COUNTY ZHONGQI ENVIRONMENTAL ENGCO
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