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Method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic

A harmless treatment, low-concentration technology, applied in chemical instruments and methods, inorganic chemistry, arsenic compounds, etc., can solve the problems of low-concentration arsenic-containing waste residues that are difficult to handle, dispose and recycle, and achieve the effect of alleviating hoarding and storage

Active Publication Date: 2016-10-12
TONGJI UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention provides a method for harmless treatment of low-concentration arsenic-containing waste slag and recovery of arsenic in view of the problem that low-concentration arsenic-containing waste slag is difficult to dispose of and resource utilization at the present stage

Method used

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  • Method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic

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Effect test

Embodiment 1

[0035] The object of treatment is the gold extraction tailings produced by a gold mine. It is gray-green fine-grained decemented matter with a moisture content of 13.90-16.14%. X-ray fluorescence spectroscopy (XRF) detection shows that the tailings mainly contain Si, Al, Fe, Ca, K and other elements, the content of arsenic is 0.263%. X-ray diffractometer detection shows that the arsenic in the tailings is mainly As 2 o 3 Exists in the form of As 2 S 3 , FeAsS and other forms exist.

[0036] The harmless treatment of the tailings and the arsenic recovery process are as follows: figure 1 as shown, figure 1 middle * The dotted line at the top indicates whether sulfuric acid is added according to the demand, and the rest of the dotted lines indicate the cycle. The specific process is as follows:

[0037](1) Mix the sodium hydroxide solution with a concentration of 1.2mol / L and the tailings slag at a ratio of 3L / kg, heat the solution to 60°C, stir it mechanically for 12 hours...

Embodiment 2

[0041] The processing object is the same as that in Embodiment 1.

[0042] Harmless and arsenic recovery processes such as figure 1 as shown, figure 1 middle * The dotted line at the top indicates whether sulfuric acid is added according to the demand, and the rest of the dotted lines indicate the cycle. The specific process is as follows:

[0043] (1) Mix the sodium hydroxide solution with a concentration of 1.2mol / L and the tailings slag at a ratio of 3L / kg, heat the solution to 60°C, stir it mechanically for 12 hours, and separate the solid and liquid through natural sedimentation to obtain the first-grade alkali leaching residue and the first-grade 1 time Alkaline leaching solution, the first-level alkaline leaching solution is supplemented with NaOH solution and then continued to be used for leaching of arsenic-containing waste residues to obtain first-level 2 times of alkaline leaching solutions, and the first-level alkaline leaching solution is repeatedly used for lea...

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Abstract

The invention relates to a method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic. Aiming at low-concentration arsenic-containing waste residue, according to the invention, a multistage alkaline leaching method is adopted, wherein mechanical stirring is performed for 10-12h in the environment of 60-80 DEG C, three-stage successive leaching is adopted, the arsenic leaching rate reaches more than 80%, the arsenic content of waste residue after treatment is less than 0.05%, which is lower than the hazardous waste identification limiting value, and therefore, the waste residue can be used as making material of building materials. As2O3 in an arsenic-containing alkaline leaching solution can be recovered by acid neutralization and sedimentation, and ferric sulfate is added to a leaching solution after filtering and sedimentation so as to produce FeAsO4.2H2O sedimentation, the comprehensive arsenic removing rate of the arsenic-containing alkaline leaching solution can reach 99%, and filter liquor can be recycled. Compared with the prior art, according to the invention, no wastewater discharge is caused in the whole process, the technology is simple, and the material is easily available, and the method can be widely popularized and applied to treatment and resource utilization of low-concentration arsenic-containing solid waste.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and resource utilization, and in particular relates to a method for harmless treatment of low-concentration arsenic-containing waste residue and arsenic recovery. Background technique [0002] Arsenic is often associated with non-ferrous metals such as tungsten, tin, copper, lead, zinc, antimony, mercury, and gold. With the massive mining and smelting of these metals, a large amount of arsenic enters the arsenic-containing waste residue with an annual output of over one million tons in smelters However, these arsenic-containing waste residues are usually handled in the form of hoarding and storage. As a result, serious arsenic poisoning incidents have occurred in many areas of the country, resulting in serious environmental problems. Therefore, how to deal with these arsenic-containing waste residues has become an unavoidable problem. [0003] At present, a series of solidifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/04C01G28/00C01G49/00
CPCC01G28/005C01G49/00C22B7/008C22B30/04Y02P10/20
Inventor 何品晶韩文昊于思源章骅邵立明
Owner TONGJI UNIV
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