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Method for separating and purifying high-antimony crude tin

A crude tin, control and grading technology, applied in the direction of improving process efficiency, can solve the problems of antimony open circuit rate of only 50%, complex anode slime composition, and difficult comprehensive treatment, etc., to achieve friendly working environment, high metal recovery efficiency, The effect of easy operation

Active Publication Date: 2021-12-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of anode slime is complex, and it is difficult to comprehensively treat valuable metals such as antimony and tin. At the same time, the electrolytic waste liquid contains a large amount of arsenic, which is extremely harmful to the environment.
(3) High temperature-low temperature two-stage continuous vacuum distillation method: high-antimony crude tin is subjected to high-temperature vacuum distillation to produce crude tin and tin-lead-antimony alloy Ⅰ (Sn25~30%, Pb30%, Sb25%), tin-lead-antimony alloy Ⅰ Tin-antimony alloy (Sb15.45%) and lead-antimony alloy (Sb40%) are produced by low-temperature vacuum distillation. This method realizes the separate recovery of tin, lead and antimony, and realizes the open circuit of part of antimony, but the open circuit rate of antimony is only 50%.
This method recovers tin in a more economical way, but the antimony content in the obtained vacuum crude tin is still high (Sb<3wt.%), and in the process of electrolytic refining, a large amount of antimony enters the anode slime, which is difficult for subsequent treatment

Method used

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  • Method for separating and purifying high-antimony crude tin
  • Method for separating and purifying high-antimony crude tin
  • Method for separating and purifying high-antimony crude tin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown, the method for the separation and purification of this high antimony thick tin, it comprises the following steps:

[0021] Step 1. Carry out vacuum gasification treatment to 1 kg of high-antimony crude tin (its composition is as shown in Table 1), so that the volatile impurity elements in the crude tin are gasified to the maximum extent, and the mixed metal vapor formed by gasification and volatilization; The temperature in the vacuum gasification treatment is 1400°C, the system pressure is 100Pa, and the gasification time is 200min;

[0022] Table 1

[0023] element sn Pb Sb As Content (wt%) 71.65 8.46 16.72 3.17

[0024] Step 2. The mixed metal vapor obtained in step 1 is introduced into the graded condenser connected with the vacuum gasification furnace, and the temperature of the condensation area of ​​the graded condenser is controlled to be 550~700°C, 300~450°C and 100~250°C, respectively, to obtain Crude l...

Embodiment 2

[0029] Such as figure 1 Shown, the method for the separation and purification of this high antimony thick tin, it comprises the following steps:

[0030] Step 1. Carry out vacuum gasification treatment to 1 kg of high-antimony crude tin (its composition is as shown in Table 3), so that the volatile impurity elements in the crude tin are gasified to the maximum extent, and the mixed metal vapor formed by gasification volatilization; The temperature in the vacuum gasification treatment is 900°C, the system pressure is 1Pa, and the gasification time is 30min;

[0031] table 3

[0032]

[0033] Step 2. The mixed metal vapor obtained in step 1 is introduced into the graded condenser connected with the vacuum gasification furnace, and the temperature of the condensation area of ​​the graded condenser is controlled to be 550~700°C, 300~450°C and 100~250°C, respectively, to obtain Crude lead, crude antimony and crude arsenic products, and refined tin products left by gasification...

Embodiment 3

[0038] Such as figure 1 Shown, the method for the separation and purification of this high antimony thick tin, it comprises the following steps:

[0039] Step 1. Carry out vacuum gasification treatment to 1kg of high-antimony crude tin (its composition is as shown in Table 5), so that the volatile impurity elements in the crude tin are gasified to the maximum extent, and the mixed metal vapor formed by gasification volatilization; The temperature in the vacuum gasification treatment is 1200°C, the system pressure is 10Pa, and the gasification time is 30min;

[0040] table 5

[0041] element sn Pb Sb As Content (wt%) 94.29 1.27 3.49 0.95

[0042] Step 2. The mixed metal vapor obtained in step 1 is introduced into the graded condenser connected with the vacuum gasification furnace, and the temperature of the condensation area of ​​the graded condenser is controlled to be 550~700°C, 300~450°C and 100~250°C, respectively, to obtain Crude lead, cru...

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PUM

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Abstract

The invention relates to a method for separating and purifying high-antimony crude tin, and belongs to the technical field of non-ferrous metal pyrometallurgy. Vacuum gasification treatment is carried out on the high-antimony crude tin, volatile impurity elements in the crude tin are gasified to the maximum extent, and mixed metal vapor is formed through gasification and volatilization; and the obtained mixed metal steam is guided into a grading condenser connected with a vacuum gasification furnace, the temperatures of condensing areas of the grading condenser are controlled to be 550-700 DEG C, 300-450 DEG C and 100-250 DEG C respectively, and crude lead, crude antimony and crude arsenic products, and refined tin products left by gasification and volatilization are obtained respectively. The method solves the problem of circulation of the antimony element in a tin refining system, has the advantages of short flow, no generation of three wastes, maximum recovery of valuable metals, low treatment cost, high metal recovery rate, direct recovery rate, good operation environment and safe and controllable process.

Description

technical field [0001] The invention relates to a method for separating and purifying high-antimony crude tin, which belongs to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] Most tin smelting enterprises at home and abroad adopt pyro-refining process to gradually remove impurities in crude tin. The main processes are condensate to remove iron and arsenic, add sulfur to remove copper (sulfur slag), add aluminum to remove arsenic and antimony (aluminum slag), and crystallize and separate In addition to lead, bismuth, vacuum distillation treatment of solder. Among them, aluminum slag generally contains 6%~12% aluminum, 10%~15% antimony, 1%~3% arsenic, and 55%~70% tin. people die. [0003] Most of the aluminum slag is smelted in an electric furnace to produce tin, antimony, and arsenic dust (containing 30-35% tin, 0.5-1% arsenic, and 2-4% antimony), electric furnace slag, and high-antimony crude tin (containing 80-85% tin, Antimony 3~12...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B13/00C22B25/00C22B30/02C22B30/04
CPCC22B9/02C22B25/00C22B30/02C22B30/04C22B13/00Y02P10/20C22B25/02C22B13/02C22B5/16C22B9/04
Inventor 李一夫张环杨斌刘大春徐宝强田阳陈秀敏徐俊杰周生安
Owner KUNMING UNIV OF SCI & TECH
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