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A method for recovering cadmium from cadmium-containing high arsenic soot

A technology of soot and arsenic elements, applied in chemical instruments and methods, improvement of process efficiency, iron compounds, etc., to achieve the effect of avoiding arsine gas and efficient recovery

Active Publication Date: 2022-07-12
CENT SOUTH UNIV
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  • Summary
  • 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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  • A method for recovering cadmium from cadmium-containing high arsenic soot
  • A method for recovering cadmium from cadmium-containing high arsenic soot
  • A method for recovering cadmium from cadmium-containing high arsenic soot

Examples

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Effect test

Embodiment 1

[0035] Take 60ml of 30% hydrogen peroxide (H 2 O 2 The molar concentration is 9.8mol / L) and 340ml of water is added to form a leaching solution, 80 g of the above-mentioned raw materials are added, and the leaching solution containing cadmium and arsenic and the leaching slag containing valuable metals are obtained by stirring for 4h and filtering, and the obtained leaching slag is sent to recycle lead, wherein cadmium The leaching rate of arsenic was 88.2%, and the leaching rate of arsenic was 97.3%. After adjusting the pH of the leaching solution containing cadmium and arsenic elements to 2.7 with sodium hydroxide solution, use P204 (P204: sec-octanol: sulfonated kerosene = 6: 1: 13, water phase: oil phase = 1: 1) to carry out Four-stage countercurrent extraction of cadmium, pH was adjusted to 2.7 with sodium hydroxide solution after each stage of extraction, and then the next stage of extraction was carried out. The extraction time was 15 minutes, and the extraction rate o...

Embodiment 2

[0037] Take 72ml of 30% hydrogen peroxide (H 2 O 2 The molar concentration is 9.8mol / L) and 408ml of water is added to form a leaching solution, 80 g of the above-mentioned raw materials are added, and the leaching solution containing cadmium and arsenic elements and the leaching residue containing valuable metals are obtained by stirring for 4h and filtering, and the gained leaching residue is sent to reclaim lead, wherein cadmium and arsenic are filtered. The leaching rate of arsenic was 90.9%, and the leaching rate of arsenic was 94.8%. After adjusting the pH of the leaching solution containing cadmium and arsenic elements to 2.7 with sodium hydroxide solution, use P204 (P204: sec-octanol: sulfonated kerosene = 15: 1: 34, water phase: oil phase = 1: 1) to carry out Four-stage countercurrent extraction of cadmium, pH was adjusted to 2.7 with sodium hydroxide solution after each stage of extraction, and then the next stage of extraction was carried out. The back-extraction tim...

Embodiment 3

[0039] Take 80ml of 30% hydrogen peroxide (H 2 O 2 The molar concentration is 9.8mol / L) and 320ml of water is added to form a leaching solution, 80 g of the above-mentioned raw materials are added, and the leaching solution containing cadmium and arsenic and the leaching slag containing valuable metals are obtained by stirring and filtering for 3h. The leaching rate of arsenic was 86.2%, and the leaching rate of arsenic was 99.2%. After adjusting the pH of the leaching solution containing cadmium and arsenic elements to 2.7 with sodium hydroxide solution, use P204 (P204: sec-octanol: sulfonated kerosene = 6: 1: 13, water phase: oil phase = 1: 1) to carry out Four-stage countercurrent extraction of cadmium, pH was adjusted to 2.7 with sodium hydroxide solution after each stage of extraction, and then the next stage of extraction was carried out. The extraction time was 15 minutes, and the extraction rate of cadmium was 98.8%. The obtained cadmium-containing organic phase was ...

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Abstract

The invention discloses a method for recovering cadmium from soot containing cadmium and high arsenic. leaching residue of valence metals; (2) extraction: the leaching solution containing cadmium and arsenic elements is adjusted to pH 2.5-3.0 and then extracted to obtain cadmium-containing organic phase and arsenic-containing raffinate; (3) back extraction: cadmium-containing organic phase (4) Precipitation of cadmium: the cadmium sulfate solution is subjected to precipitation reaction with sodium sulfide to obtain cadmium sulfide; (5) arsenic solidification: soluble ferrous salt is added to the arsenic-containing raffinate, and the Enter the gaseous oxidant to react to obtain scorodite crystals. The invention first effectively extracts cadmium in the cadmium-containing high-arsenic soot through the extraction method, so that cadmium is separated from lead, iron, bismuth, etc., and at the same time, the safe disposal of arsenic is realized, and the highly toxic arsenic hydrogen gas is avoided in the process. production, economical and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of valuable metal recycling and utilization of 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 the organism and difficult to excrete, thus causing fatal harm to the organism. 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. In the process of pyrometallurgical metallurgy, volatile elements, such as As, Cd, Zn, and Pb, are usually volatilized into the flue for enric...

Claims

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Application Information

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Patent Type & Authority Patents(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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