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Novel method for separating antimony from lead-antimony crude alloy

A technology of coarse alloy and new method, applied in the direction of improving process efficiency, can solve the problems of long cooling time, high cost, and difficulty in achieving theoretical composition, and achieve the effect of simple process and low cost

Inactive Publication Date: 2018-06-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method takes a long time to cool down, the operation is interrupted, and the crystal grains and the composition of the lead-rich liquid fluctuate greatly, so it is difficult to achieve the theoretical composition.
There is also a document "Research on Vacuum Distillation and Separation of Lead-antimony Alloys" that proposes to use multi-stage continuous vacuum distillation to separate lead-antimony alloys. The antimony binary alloy system is a negative deviation system, and it is impossible to achieve effective separation of lead-antimony alloys only by vacuum distillation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 5g of lead-antimony crude alloy containing 42% antimony in a corundum boat, and then heat it in a vacuum resistance furnace. When the vacuum degree is controlled at 14kPa, the air volume entering the system is 3L / min, and the reaction temperature is 660°C , the reaction time is 180min, after the reaction is over, the distillate Sb is obtained 2 o 3 The content of PbO in the distillate is 0.051%, and the content of antimony in the crude lead of the distillate is 6.88%.

Embodiment 2

[0012] Take 5g of lead-antimony crude alloy containing 42% antimony in a corundum boat, and then place it in a vacuum resistance furnace for heating. When the vacuum degree is controlled to be 14kPa, the air volume entering the system is 3L / min, and the reaction temperature is 680°C , the reaction time is 180min, after the reaction is over, the distillate Sb is obtained 2 o 3 The content of PbO in the distillate is 0.082%, and the content of antimony in the crude lead of the distillate is 2.02%.

Embodiment 3

[0014] Take 5g of lead-antimony crude alloy containing 42% antimony in a corundum boat, and then place it in a vacuum resistance furnace for heating. When the vacuum degree is controlled to be 14kPa, the air volume entering the system is 3L / min, and the reaction temperature is 680°C , the reaction time is 210min, after the reaction is over, the distillate Sb is obtained 2 o 3 The content of PbO in the medium is 0.12%, and the content of antimony in the crude lead of the distillate is 0.30%.

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Abstract

The invention discloses a novel method for separating antimony from lead-antimony crude alloy. According to the method, air is used as an oxidizing agent, concentration of oxygen is controlled by adjusting the vacuum degree of a system, lead-antimony separation is carried out on the lead-antimony crude alloy containing 42% of antimony in a dynamic oxidation process; the vacuum degree is controlledto be 14 kPa, the vacuum reaction temperature is 660-680 DEG C, the vacuum reaction time is 180-240 minutes, the content of PbO in obtained Sb2O3 is lower than 1% and can be used for producing antimony white, and meanwhile, the crude lead of distillation residues is lower than 1% of antimony so that refined lead can be produced by refining. Compared with a conventional lead-antimony coarse alloynormal-pressure oxidation method, the method has advantages of being low in energy consumption, thorough in separation, simple in process and free of pollution.

Description

technical field [0001] The invention relates to a new method for separating antimony from a lead-antimony crude alloy, which belongs to the technical field of vacuum nonferrous metallurgy. Background technique [0002] brittle pyrobenite (Pb 4 FeSb 6 S 14 ) is a complex sulfide mineral rich in important metal elements such as Pb, Sb and Ag. Since lead and antimony exist in the form of solid solution in brittle pyroside-antimonite, they cannot be separated by existing beneficiation methods, so they must be separated through metallurgical processes. At present, the traditional pyrometallurgical process for dealing with brittle pyrotechnic ore is mainly divided into the following steps: first put the brittle pyroantimony ore into a fluidized furnace for roasting and desulfurization, and then reduce and smelt it in a blast furnace to obtain a lead-antimony alloy with an antimony content of about 45%. In the enterprise, this alloy is called lead-antimony crude alloy. At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/02C22B13/02
CPCC22B13/02C22B30/02Y02P10/20
Inventor 丘克强付帮帮严伟健
Owner CENT SOUTH UNIV
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