Method of recovering cadmium from cadmium-containing high-arsenic soot

A technology of soot and arsenic, which is applied in chemical instruments and methods, improvement of process efficiency, iron compounds, etc., to avoid the effect of highly toxic arsenic hydrogen gas

Active Publication Date: 2020-04-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems existing in the existing cadmium-containing and high-arsenic soot, the purpose of the present invention is to provide a method for recovering cadmium from cadmium-containing and high-arsenic soot and for harmlessly treating arsenic. The cadmium in the arsenic soot is effectively extracted, so that the cadmium is efficiently separated from valuable metals such as lead, iron, and bismuth, and at the same time, the safe disposal of arsenic is realized, and the generation of highly toxic arsine gas is avoided during the process, which is safe Economic and environmental protection

Method used

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  • Method of recovering cadmium from cadmium-containing high-arsenic soot
  • Method of recovering cadmium from cadmium-containing high-arsenic soot
  • Method of recovering cadmium from cadmium-containing high-arsenic soot

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Get 60ml mass fraction 30% hydrogen peroxide (H 2 o 2 The molar concentration is 9.8mol / L) and 340ml of water are added to make a leachate, add 80g of the above-mentioned raw materials, stir for 4 hours and filter to obtain a leachate containing cadmium and arsenic elements and a leach residue containing valuable metals, and the obtained leach residue is sent to recover lead, of which cadmium The leaching rate of arsenic is 88.2%, and the leaching rate of arsenic is 97.3%. Use sodium hydroxide solution to adjust the pH of the leaching solution containing cadmium and arsenic to 2.7, and then use P204 (P204: 2-octanol: sulfonated kerosene = 6:1:13, water phase: oil phase = 1:1) Four stages of countercurrent extraction of cadmium, after each stage of extraction, use sodium hydroxide solution to adjust the pH to 2.7 before proceeding to the next stage of extraction, the extraction time is 15min, and the extraction rate of cadmium is 98.6%. Gained cadmium-containing organi...

Embodiment 2

[0037] Get 72ml mass fraction 30% hydrogen peroxide (H 2 o 2 The molar concentration is 9.8mol / L) and 408ml of water are added to make a leachate, add 80g of the above-mentioned raw materials, stir for 4 hours and filter to obtain a leachate containing cadmium and arsenic elements and a leach residue containing valuable metals, and the obtained leach residue is sent to recover lead, of which cadmium The leaching rate of arsenic is 90.9%, and the leaching rate of arsenic is 94.8%. Use sodium hydroxide solution to adjust the pH of the leaching solution containing cadmium and arsenic to 2.7, and then use P204 (P204: 2-octanol: sulfonated kerosene = 15:1:34, water phase: oil phase = 1:1) Four stages of countercurrent extraction of cadmium, after each stage of extraction, use sodium hydroxide solution to adjust the pH to 2.7 before proceeding to the next stage of extraction. The back extraction time is 15 minutes, and the extraction rate of cadmium is 98.7%. The obtained cadmium-co...

Embodiment 3

[0039] Get 80ml mass fraction 30% hydrogen peroxide (H 2 o 2 The molar concentration is 9.8mol / L) and 320ml of water are added to make a leachate, add 80g of the above-mentioned raw materials, stir for 3 hours and filter to obtain a leachate containing cadmium and arsenic elements and a leach residue containing valuable metals, and the obtained leach residue is sent to recover lead, of which cadmium The leaching rate of arsenic is 86.2%, and the leaching rate of arsenic is 99.2%. Use sodium hydroxide solution to adjust the pH of the leaching solution containing cadmium and arsenic to 2.7, and then use P204 (P204: 2-octanol: sulfonated kerosene = 6:1:13, water phase: oil phase = 1:1) Four stages of countercurrent extraction of cadmium, after each stage of extraction, use sodium hydroxide solution to adjust the pH to 2.7 before proceeding to the next stage of extraction, the extraction time is 15 minutes, and the extraction rate of cadmium is 98.8%. Gained cadmium-containing o...

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Abstract

The invention discloses a method of recovering cadmium from cadmium-containing high-arsenic soot. The method includes the following steps of firstly, oxidizing leaching, wherein oxidizing leaching isperformed on the cadmium-containing high-arsenic soot, and filtering is performed to obtain a leachate containing cadmium and arsenic and leach residues containing valuable metals; secondly, extracting, wherein extracting is performed on the leachate containing cadmium and arsenic after the pH is adjusted to be 2.5-3.0, and a cadmium-containing organic phase and a arsenic-containing extraction solution are obtained; thirdly, reverse extracting, wherein a cadmium sulfate solution is obtained after reverse extracting is performed on the cadmium-containing organic phase through a sulfuric acid solution; fourthly, cadmium precipitation, wherein precipitation reaction is performed on the cadmium sulfate solution through sodium sulphide to obtain cadmium sulfide; and fifthly, arsenic curing, wherein soluble ferrite is added to the arsenic-containing extraction solution, a gaseous oxidant is introduced for reaction, and scorodite crystals are obtained. According to the method, cadmium in thecadmium-containing high-arsenic soot is effectively extracted through an extracting method, cadmium is separated from lead, iron, bismuth and the like, meanwhile the safe disposal of arsenic is realized, highly toxic arsine gas is prevented from being generated in the technological process, and the method is economical and friendly to the environment.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of valuable metals from arsenic-containing soot, and relates to a method for recovering cadmium from cadmium-containing high-arsenic soot. Background technique [0002] As an important non-ferrous metal, cadmium is widely used in nickel-cadmium batteries, coatings, electroplating, non-ferrous metal alloys and semiconductors. At the same time, cadmium is also a common toxic element, which is easy to accumulate in organisms and difficult to excrete, thus causing fatal harm to organisms. Improper disposal of cadmium-containing waste is an important cause of cadmium pollution. Therefore, comprehensive recovery of cadmium from cadmium-containing waste can not only increase economic value but also reduce pollution to the ecological environment. During the process of pyrometallurgy, volatile elements, such as As, Cd, Zn and Pb, usually volatilize into the flue for enrichment. The soot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B30/04C22B17/00C01G49/00
CPCC22B7/02C22B7/006C22B17/04C22B30/04C01G49/00Y02P10/20
Inventor 唐新村陈熙荣志昊汪洋
Owner CENT SOUTH UNIV
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