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Process for recovering cadmium from cadmium-contained incineration slag

A technology of incineration slag and process, which is applied in the field of heavy metal recovery process, can solve the problems of high cost, leakage of heavy metal ions, secondary pollution, etc., and achieve the effect of low production cost, no secondary pollution, and low investment

Inactive Publication Date: 2017-04-19
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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Problems solved by technology

The current landfill cost of solid waste is about 200 yuan / ton, which is high cost; cadmium in incineration slag and ash mainly exists in oxidized form and is easily soluble in acid. secondary pollution

Method used

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  • Process for recovering cadmium from cadmium-contained incineration slag

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] Embodiment 1 of the present invention, such as figure 1 Shown, a kind of process of recovering cadmium from cadmium-containing incineration slag, its process step is:

[0024] The first is water immersion, leaching cadmium-containing incineration slag with water, the ratio of water to cadmium-containing incineration slag is 3:1, so that the soluble salts in cadmium-containing incineration slag are dissolved in water, and the water immersion solution is obtained, in which the soluble salts Mainly sodium and potassium salts, separated from cadmium oxides;

[0025] The second is heap leaching...

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Abstract

The invention relates to a process for recovering cadmium from cadmium-contained incineration slag. The process comprises the following steps: water leaching: the cadmium-contained incineration slag is leached by water, so that soluble salt in the cadmium-contained incineration slag is dissolved in the water; and water leaching liquid is obtained, and is separated from the cadmium-contained incineration slag; heap leaching: according to the properties of cadmium in the cadmium-contained incineration slag, sulfuric acid, hydrochloric acid or nitric acid is selected for segmented heap leaching, so that cadmium enters heap leaching liquid, and the content of cadmium in the cadmium-contained incineration slag reaches the discharge standard; enrichment: according to the properties of cadmium in the heap leaching liquid, resins are adopted to absorb low-concentration cadmium in the heap leaching liquid; cadmium is enriched in the resins; and absorption post liquid is obtained, and is returned for secondary heap leaching; desorption: the selected cadmium is used for absorbing the resins; and the sulfuric acid is adopted to desorb the absorbed resins at normal temperature to obtain cadmium liquid; and electrolysis: the cadmium liquid is electrolyzed; cadmium ions in solution are separated out on a cathode plate in a cadmium ingot form; and electrolysis post liquid is obtained.

Description

technical field [0001] The invention belongs to the technical field of heavy metal recovery technology, and relates to a technology for recovering cadmium from cadmium-containing incineration slag. Background technique [0002] As an important part of phytoremediation, the disposal of heavy metal-enriched plant biomass is considered to be one of the important factors restricting the commercial application of phytoremediation. Based on the principles of reduction, harmlessness, and resource utilization, many researchers have devoted themselves to disposal in recent years using technologies such as incineration, ashing, composting, compressed landfill, pyrolysis, liquid phase extraction, and plant metallurgy. Heavy metals enrich plant biomass, and a series of important research results have been obtained. From phytoremediation to remediation phytodisposal, there is no more advanced technology. Currently, heavy metal smelting and recovery technology is more widely used. Howev...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B17/00C25C1/16C05G1/00
CPCC05G1/00C22B7/006C22B7/007C22B7/04C22B17/04C25C1/16Y02P10/20
Inventor 谢巧玲陈福明帅和平王丹丹吴思国卢伟李越张淑然张祖江
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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