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Method for recovering valuable metal from electroplating sludge

A technology of electroplating sludge and valuable metals, applied in the direction of improving process efficiency, etc., can solve problems such as poor economic benefits, environmental pollution, loss of metal resources, etc., achieve significant economic and social benefits, easy control of process conditions, The effect of high purity of recycled products

Inactive Publication Date: 2012-04-18
朱小红
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Sintering method: Mix electroplating sludge and clay at a ratio of 1:20 or more, and burn it to 1000 degrees or more to make red bricks or gray bricks. However, due to the small sales volume and economic losses, it is difficult to form a production scale. The brick process still pollutes the environment and at the same time causes a large amount of precious metal resources to be lost;
[0004] 2. Acid-soluble-sulfurization method: It is a process of recovering nickel and copper by sulfide precipitation step by step. The nickel and copper products recovered by this process are only primary products, and the product purity and added value are not high, and further processing is required Disposal, resulting in poor economic benefits;
[0005] 3. Ammonia leaching method: ammonia complex group leaching-ammonia distillation-hydrolyzed slag sulfuric acid leaching-solvent extraction-metal salt crystallization recovery process, because ammonia has a pungent smell, recovery is difficult and affects the operating environment, and the sealing of the leaching device is high. , it is not easy to achieve industrialization, so it is difficult to popularize and apply;

Method used

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  • Method for recovering valuable metal from electroplating sludge
  • Method for recovering valuable metal from electroplating sludge

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Experimental program
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Effect test

Embodiment 1

[0035] see figure 1 , the present embodiment production method is as follows:

[0036] Step 1: Put 500 grams of electroplating sludge raw materials (Ni5.6%, Cu7.8%, Cr3.88%, Zn3.12%, Fe1.29%) in a 3000ml beaker, with a 2:1 liquid-solid Then, slowly add concentrated sulfuric acid while stirring, and stop adding acid when the pH is stable at 1.5; then turn on the electric furnace to raise the temperature to 75°C, and under the condition of about 75°C, properly replenish acid to maintain pH = 1.5 remains the same, continue to decompose for 60 minutes; then carry out pressure filtration, the pressure filtration filtrate enters the next process to continue processing, the pressure filtration filter residue is washed, the washing water is returned to the previous process for pulping water, and the residue after washing is solidified.

[0037] Step 2: Put 1600ml of the solution prepared in step 1 into a 3000ml beaker, start stirring, and heat to 85°C. 2+ : NaClO 3 = Add sodium chl...

Embodiment 2

[0044] see figure 1 , the present embodiment production method is as follows:

[0045] Step 1: Put 500 grams of electroplating sludge raw materials (Ni3.5%, Cu1.2%, Cr6.43%, Zn1.12%, Fe2.01%) in a 3000ml beaker, with 3:1 liquid-solid Then, slowly add concentrated sulfuric acid while stirring. When the pH is stable at 1.5, stop adding acid; turn on the electric furnace and raise the temperature to 80°C. Change, continue to decompose for 1 hour; press filtration, the filtrate enters the next process to continue processing, the filter residue is washed, the washing water is returned to the previous process for pulping water, and the washed residue is solidified;

[0046] Step 2: Put 1600ml of the solution prepared in step 1 into a 3000ml beaker, start stirring, and heat to 90°C. 2+ : NaClO 3 = Add 10ml of sodium chlorate at a ratio of 6:0.5. After reacting for 20 minutes, slowly add 30% sodium carbonate solution while stirring. When the pH=4 or so, stop adding sodium carbonate...

Embodiment 3

[0053] see figure 1 , the present embodiment production method is as follows:

[0054] Step 1: Put 500 grams of electroplating sludge raw materials (Ni 3.45%, Cu 8.7%, Cr 5.69%, Zn 1.5%, Fe 2.31%) into a 3000ml beaker, and make a slurry with a liquid-solid ratio of 4:1 Then, slowly add concentrated sulfuric acid while stirring, when the pH is stable at 1.5, stop adding acid; turn on the electric furnace and heat up to 80°C, and under the condition of 80°C, add acid appropriately to keep pH = 1.5, and continue to decompose 80 minutes; then carry out pressure filtration, the pressure filtration filtrate enters the next process to continue processing, the pressure filtration filter residue is washed, and the washing water is returned as slurry mixing water, and the residue after washing is solidified;

[0055] Step 2: Put 1600ml of the solution prepared in step 1 into a 3000ml beaker, start stirring, and heat to 95°C. 2+ : NaClO 3 Add sodium chlorate in the ratio of =6:0.6 to ...

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Abstract

The invention relates to a method for recovering valuable metals from electroplating sludge. Electroplating sludge is used as a raw material; advanced theories and scientific means of leaching principle, redox principle, extraction principle, iron filing displacement principle and evaporation crystallization principle in a wet method metallurgy are integrally utilized; and a technology of ''acid decomposition of electroplating sludge-leachate purification to remove ferrochrome-P204 impurity removal-P507 enrichment-condensation crystallization'' is employed. Meanwhile, calcium and magnesium are removed by an extraction method, which substitutes a traditional sodium fluoride method for removing calcium and magnesium. A recovery rate of nickel reaches 95%, and copper content of recovered copper sponge is larger than 80%. Besides, acid dissolved slag and purifying slag can be solidified to reach requirements of environmental protection and will not cause secondary pollution; waste water can be recycled and has a strong technological versatility. The method is suitable for treating various routine electroplating sludge, has easily controllable technical conditions and low operating cost and is easy for realizing large scale production; therefore, the method is a practical novel technology for treating electroplating sludge in a way of quantitative reduction, harmlessness and resource.

Description

technical field [0001] The invention relates to a method for recovering valuable metals from electroplating sludge, and belongs to the technical field of resource recovery and utilization. technical background [0002] It is well known that there are many studies on the recovery of valuable metals from electroplating sludge, and there are many various process methods. [0003] 1. Sintering method: Mix electroplating sludge and clay at a ratio of 1:20 or more, and burn it to 1000 degrees or more to make red bricks or gray bricks. However, due to the small sales volume and economic losses, it is difficult to form a production scale. The brick process still pollutes the environment and at the same time causes a large amount of precious metal resources to be lost; [0004] 2. Acid-soluble-sulfurization method: It is a process of recovering nickel and copper by sulfide precipitation step by step. The nickel and copper products recovered by this process are only primary products,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B23/00
CPCY02P10/20
Inventor 朱小红
Owner 朱小红
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