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A method for preferentially removing arsenic from lead-antimony dust

A smoke and dust removal technology, applied in the field of non-ferrous metallurgy, can solve the problems of reducing the removal rate of arsenic, and achieve the effect of good working environment, simple operation and selective removal

Active Publication Date: 2017-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the conventional wet alkaline leaching process is used to treat lead and antimony fumes, a considerable part of lead, antimony, zinc and other elements will inevitably be leached together with arsenic, resulting in the loss of valuable metals and reducing the removal rate of arsenic

Method used

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  • A method for preferentially removing arsenic from lead-antimony dust
  • A method for preferentially removing arsenic from lead-antimony dust
  • A method for preferentially removing arsenic from lead-antimony dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The lead-antimony smoke dust that present embodiment adopts is the lead-antimony smoke dust that certain lead-zinc smelter produces, and its XRD figure is as follows figure 2 As shown, the main components are: As 6.86%, Sb 9.55%, Pb 49.13%, Zn 2.4%.

[0030] The lead-antimony smoke dust of the present embodiment preferentially removes the method for arsenic, and its technological process is as follows figure 1 shown, including the following steps:

[0031]1) Weigh 40g of lead-antimony dust and 2g of sulfur (the mass ratio of sulfur to lead-antimony dust is 0.05:1), mix well, then add the mixture to 300mL sodium hydroxide solution (concentration is 3.0mol / L) and stir, and Heat to 90°C for 2 hours.

[0032] 2) Filter the leached solution in step 1) while it is hot to obtain the leaching solution and leaching residue I, wash the leaching residue I with hot water for 2 to 3 times, return the washed leaching residue II to the lead factory for processing, mix the washing s...

Embodiment 2

[0035] The lead-antimony fume used in this example is the lead-antimony fume produced by a lead-zinc smelter, and its main components are: As 6.86%, Sb 9.55%, Pb 49.13%, Zn 2.4%.

[0036] The lead-antimony smoke dust of the present embodiment preferentially removes the method for arsenic, and its technological process is as follows figure 1 shown, including the following steps:

[0037] 1) Weigh 50g of lead-antimony soot and 17.5g of sulfur (the mass ratio of sulfur to lead-antimony soot is 0.35:1), mix well, then add the mixture to 300mL of sodium hydroxide solution (concentration is 4.0mol / L) and stir, And heated to 80 ℃ leaching for 5 hours.

[0038] 2) Filter the leached solution in step 1) while it is hot to obtain the leaching liquid and leaching residue I, wash the leaching residue I with hot water for 2 to 3 times, return the washed leaching residue II to the lead factory for processing, mix the washing liquid and the leaching liquid Cool to room temperature and filt...

Embodiment 3

[0041] The lead-antimony smoke dust that present embodiment adopts is the lead-antimony smoke dust that certain lead-zinc smelter produces, and its technological process is as follows figure 1 As shown, its main components are: As 2.74%, Sb 9.10%, Pb 56.16%, Zn 3.48%.

[0042] The method for the priority removal of arsenic by the lead-antimony fumes of the present embodiment comprises the following steps:

[0043] 1) Weigh 30g of lead-antimony smoke and 3g of sulfur (the mass ratio of sulfur to lead-antimony smoke is 0.10:1), mix well, then add the mixture to 300mL sodium hydroxide solution (concentration is 2.0mol / L) and stir, and Heating to 50°C for 10 hours.

[0044] 2) Filter the leached solution in step 1) while it is hot to obtain the leaching solution and leaching residue I, wash the leaching residue I with hot water for 2 to 3 times, return the washed leaching residue II to the lead factory for processing, mix the washing solution and the leaching solution, and then c...

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Abstract

The invention discloses a method for preferably removing arsenic in lead and antimony smoke. The method comprises the following steps that firstly, sulphur and the lead and antimony smoke are mixed according to the mass ratio of 0.01-0.5:1, then the mixture is added into a sodium hydroxide solution to be leached, and meanwhile the temperature of the solution is kept within the range from 50 DEG C to 100 DEG C; secondly, liquid and solid separation is carried out on the solution leached in the first step, and a leaching agent and leaching residues are obtained; the leaching residues are washed, washing water obtained after washing is completed and the leaching agent are mixed and cooled to the room temperature, and filtering is carried out to obtain sodium arsenate crystal and crystalline liquid; and the crystalline liquid is used for leaching of the lead and antimony smoke in the first step. According to the technology method, the loss of valuable metal such as lead, antimony and zinc in the arsenic leaching and removing process is reduced through the adding of sulphur, meanwhile, the arsenic removing rate is increased, and selective removing of arsenic is achieved. The leaching rate of arsenic can reach 99% or more, and the content of arsenic in the leached residues can be reduced to 0.1% or lower.

Description

technical field [0001] The present invention relates to a method for preferentially removing arsenic from lead-antimony fumes, in particular to a method for preferentially removing arsenic from smelting fumes containing arsenic, lead, antimony, zinc and other elements produced in the process of lead-zinc pyrometallurgy, belonging to non-ferrous metals metallurgical field. Background technique [0002] In the process of lead-zinc pyrometallurgy, such as brittle sulfur-lead-antimony ore, a large amount of smelting dust with high arsenic content will be produced. The dust contains valuable metals such as lead, antimony, zinc, indium, etc., and has high economic value. At present, there are two ways to deal with such high-arsenic fumes: one is to return to the metallurgical furnace for smelting, and the other is to stockpile and suspend processing. Using the former method will increase the amount of returned intermediate materials, reduce the smelting capacity of the metallurg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B30/04C22B30/02C22B13/00C22B19/30
CPCY02P10/20
Inventor 郭学益易宇李栋石靖田庆华
Owner CENT SOUTH UNIV
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