System and method for treating cadmium-bearing solution

A solution and pipeline technology, applied in chemical instruments and methods, improvement of process efficiency, chemical/physical process, etc., can solve problems such as limited stirring intensity of stirring tank, low utilization rate of zinc powder, remelting of metal cadmium, etc., to achieve Improve replacement efficiency, ensure continuity, and improve reaction efficiency

Inactive Publication Date: 2016-09-21
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the solution and the solid zinc powder particles can fully contact in this way, the agitation intensity of the stirring tank is limited, resulting in relatively slow ion diffusion around the solid zinc powder particles, slow reaction speed, and low utilization rate of zinc powder.
At the same time, the longer reaction time leads to a large amount of metal cadmium resolvation
[0003] Therefore, the existing process for processing cadmium-containing solutions needs to be further improved

Method used

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  • System and method for treating cadmium-bearing solution

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specific Embodiment

[0050] In a second aspect of the invention, the invention proposes a method of treating a solution containing cadmium. According to an embodiment of the present invention, the method is carried out by using the above-mentioned system for processing cadmium-containing solution. According to a specific embodiment of the present invention, the method includes: supplying the cadmium-containing solution in the cadmium-containing solution storage device to the pipeline reactor sequentially through the first delivery pipeline, the feed pump and the second delivery pipeline; The zinc powder in the feed is supplied to at least one of the first delivery pipeline, the second delivery pipeline and the pipeline reactor, so that the zinc powder and cadmium ions in the cadmium-containing solution undergo a reduction reaction to obtain cadmium slag and cadmium-removed liquid. The inventors found that by using a pipeline reactor instead of a stirring tank for the reaction, during the reaction ...

Embodiment 1

[0058] will be 1m 3 The cadmium-containing solution obtained after removing nickel and cobalt in the second stage is supplied to the pipeline reactor sequentially through the first delivery pipeline, the feed pump and the second delivery pipeline, and is supplied to the first delivery pipeline, the second delivery pipeline and the second delivery pipeline through the zinc powder supply device at the same time. Zinc powder is supplied in the pipeline reactor, so that the zinc powder and cadmium ions in the cadmium-containing solution undergo a reduction reaction in the pipeline reactor. The reaction temperature is 80°C, the reaction time is 5min, the zinc powder dosage coefficient is 0.9, and the reaction The slurry is subjected to pressure filtration treatment, and the cadmium content in the obtained liquid after cadmium removal is lower than 1 mg / L.

Embodiment 2

[0060] will be 1m 3 The cadmium-containing solution obtained after removing nickel and cobalt in the second stage is supplied to the pipeline reactor sequentially through the first delivery pipeline, the feed pump and the second delivery pipeline, and is supplied to the first delivery pipeline, the second delivery pipeline and the second delivery pipeline through the zinc powder supply device at the same time. Zinc powder is supplied to the pipeline reactor so that the zinc powder and cadmium ions in the cadmium-containing solution undergo a reduction reaction in the pipeline reactor. The slurry is subjected to pressure filtration treatment, and the cadmium content in the obtained liquid after cadmium removal is lower than 10.2 mg / L.

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Abstract

The invention discloses a system and method for treating a cadmium-bearing solution. The system for treating the cadmium-bearing solution comprises a cadmium-bearing solution storage device, a first delivery pipeline, a feeding pump, a second delivery pipeline, a pipeline reactor and a zinc powder supply device, wherein the first delivery pipeline is connected with the cadmium-bearing solution storage device; the feeding pump is connected with the first delivery pipeline; the second delivery pipeline is connected with the feeding pump; the pipeline reactor is connected with the second delivery pipeline; and the zinc powder supply device is connected with at least one of the first delivery pipeline, the second delivery pipeline and the pipeline reactor. By the adoption of the system, the technological parameters in the replacement procedure can be optimized to a great extent, the continuity of original operation is guaranteed, and electric energy consumption and equipment investment caused by extra stirring are omitted.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular, the invention relates to a system and method for processing cadmium-containing solution. Background technique [0002] In the traditional zinc hydrometallurgy liquid purification process, zinc powder is used to remove cadmium and other impurities from the cadmium-containing leaching supernatant. In the design, a stirring tank is generally used as a reaction vessel and a strong stirring method is used to promote the reaction. Although the solution and the solid zinc powder particles can fully contact in this way, the agitation intensity of the stirring tank is limited, resulting in relatively slow ion diffusion around the solid zinc powder particles, slow reaction speed, and low utilization rate of the zinc powder. At the same time, the longer reaction time resulted in a large amount of metal cadmium returning to dissolution. [0003] Therefore, the existing process for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/00C22B3/02C22B3/46
CPCC22B3/02C22B3/46C22B19/00B01J4/00Y02P10/20
Inventor 陆业大戴江洪王鸿振赵爱君傅建国申美玲聂颖
Owner CHINA ENFI ENGINEERING CORPORATION
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