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Method for recovering valuable metal from waste chemical reagent

A technology of valuable metals and chemical reagents, applied in the field of hazardous waste resource utilization, can solve problems such as waste of resources, and achieve the effects of convenient operation, high extraction rate and stable quality

Pending Publication Date: 2021-06-11
云南大地丰源环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waste chemical reagents are of high purity, with a content of more than 99.5%. Traditional disposal methods have caused a great waste of resources, and recycling has great value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The valuable metal recovered this time is metallic silver, and the raw materials are waste chemical reagents, mainly including silver nitrate, silver oxide, silver iodide, silver bromide, silver sulfate, and silver chloride.

[0020] Utilize the method of the present invention to recycle this waste chemical reagent:

[0021] The waste chemical reagents were removed from the outer packaging, ground, passed through an 80-mesh sieve, and 10% (wt%) ammonia solution was added according to the liquid-solid ratio of 10:1, and stirred and reacted at 80°C for 4 hours to obtain a silver-ammonia solution, and Vc ( Waste medicine) reduction, recovery of metal Ag, the supernatant is ammonia solution, recycling.

Embodiment 2

[0023] The valuable metal recovered this time is metal palladium, and the raw materials are waste chemical reagents, mainly including palladium chloride, sodium tetrachloropalladate, dichlorotetraammine palladium, and palladium acetate.

[0024] Utilize the method of the present invention to recycle this waste chemical reagent:

[0025] The waste chemical reagents are removed from the outer package, ground, passed through a 120-mesh sieve, and added with aqua regia at a liquid-to-solid ratio of 8:1, dissolved at room temperature and then reduced by hydrogen gas to obtain palladium powder.

Embodiment 3

[0027] The valuable metal recovered this time is metallic nickel, and the raw materials are waste chemical reagents, mainly including nickel oxide, nickel hydroxide, nickel sulfate, nickel chloride, and nickel nitrate.

[0028] Utilize the method of the present invention to recycle this waste chemical reagent:

[0029] The waste chemical reagents were removed from the outer packaging, ground, passed through a 60-mesh sieve, and 15% (wt%) sulfuric acid solution was added according to the liquid-solid ratio of 5:1, stirred and reacted at 65°C for 2 hours to obtain a nickel sulfate solution, filtered, and washed with distilled water. Nickel sulfate is produced.

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PUM

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Abstract

The invention belongs to the technical field of hazardous waste resource utilization, and particularly relates to a method for recovering valuable metal from a waste chemical reagent. The method comprises the following steps of (1) classifying and storing the waste chemical reagent, and classifying same metal simple substances and compounds thereof into one class; (2) removing waste chemical reagent packaging materials through mechanical crushing or other pretreatment manners; (3) leaching the valuable metal by using an acid or alkali solution wet method at normal temperature or in a heating state, and adjusting the concentration of a leaching agent according to the pH value of the precipitation of the valuable metal to be extracted; and (4) precipitating, separating and drying to obtain a valuable metal compound, and then carrying out subsequent processing treatment according to the value or utilization way. Equipment used in the method is existing simple chemical reaction equipment, operation is convenient, no special process requirement exists, the content of the valuable metal in the raw materials is high, the extraction rate is high, the quality is stable, generated wastewater and waste residues enter a disposal workshop of the unit to be safely disposed, and the method is economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of hazardous waste, and in particular relates to a method for recovering valuable metals from waste chemical reagents. Background technique [0002] The laboratories of schools, hospitals, scientific research institutes, monitoring institutions and other units will produce hazardous waste during operation, and must be managed in accordance with the special regulations on the prevention and control of environmental pollution by hazardous waste in the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste". According to the "National Hazardous Waste List", the hazardous waste produced in the laboratory mainly involves other wastes of HW49 (waste code 900-999-49): discarded or abandoned by the owner without use; obsolete, fake, expired, and invalid; Hazardous chemicals collected by the department and received by the public according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B11/00C22B23/00
CPCC22B7/007C22B7/008C22B1/005C22B11/042C22B23/043Y02P10/20
Inventor 任雪娇李文豪邱金成罗劲松李行德
Owner 云南大地丰源环保有限公司
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