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Method and device of refining separating zinc by bismuth method

A technology of fire refining and refining pot, which is applied in the direction of improving process efficiency, etc., can solve the problems of loss of metal zinc, pollution of the environment, etc., and achieve the effects of stable operation, uniform speed, and stable air pressure

Inactive Publication Date: 2006-11-29
汪立果
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bismuth liquid after silver removal still contains 2-3.5% zinc, which needs to be dezincified. The traditional dezincification process used at home and abroad is to use chlorination or alkaline oxidation to make zinc form compound scum and dezincify. Separated from the bismuth liquid, this part of the zinc scum and the silver-zinc slag produced by adding zinc to remove silver are all used as waste slag for further metallurgical treatment, which not only pollutes the environment but also loses metal zinc

Method used

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  • Method and device of refining separating zinc by bismuth method

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Embodiment 1

[0023] A method for separating zinc from bismuth liquid after adding zinc and removing silver by pyro-refining, the production steps are:

[0024] Step 1: Put the bismuth liquid in a closed vacuum container, and control its temperature at about 650°C, and stir it with a stirring device, so that the lower layer of bismuth liquid is continuously lifted to the liquid surface, and the zinc from the bismuth liquid Evaporate to get zinc vapor;

[0025] Step 2: Vacuumize the zinc vapor to rise to the condensing equipment, and the vacuum residual pressure is controlled at about 50Pa. On the condensing equipment, the zinc vapor solidifies into a solid after being cooled, and attaches to the condensing equipment to obtain solid metal zinc;

[0026] Step 3: Introduce the tail gas after condensing and recovering zinc into the sedimentation purification equipment for purification treatment and discharge.

[0027] A method for extracting zinc from silver-zinc slag after adding zinc and rem...

Embodiment 2

[0034] With embodiment 1, difference is: in the method for separating zinc from the bismuth liquid after pyro-refining adds zinc and removes silver:

[0035] The vacuum distillation temperature of the bismuth liquid in step 1 is controlled at about 450°C,

[0036] The vacuum residual pressure in step 2 is controlled at about 1Pa,

[0037] In the method for extracting zinc from the silver-zinc slag after adding zinc and removing silver by pyro-refining:

[0038] The temperature at which the silver-zinc slag in step 1 melts into a liquid is about 750°C;

[0039] The vacuum distillation temperature of the melt in step 2 is controlled at about 650°C;

[0040]The vacuum residual pressure in step 3 is controlled at about 1Pa;

[0041] For the device implementing the above method, the water temperature in the cooling water jacket 3 is controlled at 40° C., and the rotating speed of the circulating screw pump 4 is controlled at 1000 rpm.

[0042] It is proved by inspection that th...

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Abstract

The invention relates to separate zinc from bismuth liquid and distill zinc from silver zinc dregs after taking refining zincification desilverization process. It puts the bismuth liquid into vacuum container and whisking, making zinc vaporize from bismuth liquid to gain zinc vapor. Vacuuming to make the vapor rise to condensing apparatus to condense to solid and adhere at condensing apparatus and gathering. Inducing the tail gas into purification device to take purifying and discharge. The method to distill zinc from silver zinc dregs is almost the same, and adds the process of melting silver zinc dregs. The device includes bismuth fine furnace, vacuum container, condensing device, whisking device, subsidence purifying device and vacuum pump. The invention could lower zinc consumption, and good economic benefit and avoid pollution of toxic gas and chlorine alkali dregs.

Description

technical field [0001] The invention relates to a nonferrous metal purification process and equipment, in particular to a process and equipment for separating zinc from bismuth liquid and extracting zinc from silver-zinc slag after bismuth fire refining, adding zinc and removing silver. Background technique [0002] At present, in the fire refining process of bismuth at home and abroad, the impurity silver in bismuth is usually removed by adding zinc to remove silver, so that silver and zinc form solid silver-zinc dross and separate from bismuth liquid. However, the bismuth liquid after silver removal still contains 2-3.5% zinc, which needs to be dezincified. The traditional dezincification process used at home and abroad is to use chlorination or alkaline oxidation to make zinc form compound scum and dezincify. Separated from the bismuth liquid, this part of the zinc scum and the silver-zinc slag produced by adding zinc to remove silver are all used as waste residues for fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/18C22B7/00
CPCY02P10/20
Inventor 汪立果
Owner 汪立果
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