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Method for recycling cadmium metal from dust of lead-smelting bottom-blowing furnace

A bottom-blowing furnace and lead smelting technology is applied in the field of soot and cadmium metal recovery of lead smelting bottom-blowing furnaces, which can solve problems such as affecting the normal production of oxygen bottom-blowing furnaces, and achieve the effects of feasible process, simple process and high leaching rate.

Inactive Publication Date: 2018-11-30
河南金利金铅集团有限公司
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Problems solved by technology

[0002] my country is a big country that produces lead. With the development of lead smelting technology and the continuous improvement of people's requirements for environmental protection and energy saving, in the existing oxygen bottom blowing furnace-reduction furnace lead smelting production process, the bottom blowing furnace soot has been in the system Medium cycle, so that impurities continue to accumulate, so that the content of Cd in the soot of the bottom blowing furnace often reaches more than 30%, which affects the normal production of the oxygen bottom blowing furnace

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  • Method for recycling cadmium metal from dust of lead-smelting bottom-blowing furnace
  • Method for recycling cadmium metal from dust of lead-smelting bottom-blowing furnace
  • Method for recycling cadmium metal from dust of lead-smelting bottom-blowing furnace

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[0019] A method for recovering cadmium metal from lead smelting bottom-blown furnace soot, comprising the following steps, (1) leaching process: take lead smelting bottom-blown furnace soot and carry out water leaching, so that Cd compounds enter the liquid phase, and compounds such as Pb and As are insoluble in The water is enriched in the leaching slag; then separated to obtain the leaching liquid and leaching slag; the leaching slag can be sent to the lead smelting furnace.

[0020] (2) Replacement process: Take the leaching solution, adjust the pH to 2.0-2.5 with a mixture of sulfuric acid and hydrochloric acid, heat to 103-105°C, and replace it with aluminum powder with a particle size of 140-200 mesh to obtain high-cadmium slag and replaced liquid; pH adjustment can be adjusted with industrial grade hydrochloric acid and sulfuric acid. High cadmium slag can be pressed into sponge cadmium through a compactor, and then enter the production of refined cadmium.

[0021] The...

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Abstract

The invention provides a method for recycling cadmium metal from dust of a lead-smelting bottom-blowing furnace, which can be used for treating the ash of the bottom-blowing furnace and displacing with aluminum powder to recycle cadmium. The method for recycling the cadmium metal from the dust of the lead-smelting bottom-blowing furnace comprises the following steps: (1) a leaching procedure: carrying out water immersion on the ash of the lead-smelting bottom-blowing furnace and enabling a Cd compound to enter a liquid phase; enriching compounds including Pb, As and the like which are not dissolved in water in leaching residues; then separating to obtain a leaching solution and the leaching residues; (2) a displacement procedure: taking out the leaching solution and regulating the pH (Potential of Hydrogen) of a mixed solution of sulfuric acid and hydrochloric acid to 2.0 to 2.5; heating to 103 to 105 DEG C; displacing with the aluminum powder with the granularity of 140 to 200 meshes,so as to obtain high-cadmium residues and a displaced solution.

Description

technical field [0001] The invention relates to a method for recovering cadmium metal from bottom-blown furnace soot in lead smelting. Background technique [0002] my country is a big country that produces lead. With the development of lead smelting technology and the continuous improvement of people's requirements for environmental protection and energy saving, in the existing oxygen bottom blowing furnace-reduction furnace lead smelting production process, the bottom blowing furnace soot has been in the system The medium circulation makes the impurities continue to accumulate, so that the Cd content in the soot of the bottom-blown furnace often reaches more than 30%, which affects the normal production of the bottom-blown oxygen furnace. Bottom-blown furnace soot is not only stored for sale, but it is necessary to find an open circuit in time to discharge it from the system. Contents of the invention [0003] In order to solve the above problems, the present invention p...

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Application Information

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IPC IPC(8): C22B7/02C22B17/00C22B13/00
CPCC22B7/006C22B7/02C22B13/045C22B17/04Y02P10/20
Inventor 张艳军仝其建杨华锋姬宏图宋德阳石涛成清理
Owner 河南金利金铅集团有限公司
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