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Method for separating tin, antimony, bismuth, arsenic and copper from tin electrolytic anode mud

A technology of anode slime and sodium stannate, applied in the direction of improving process efficiency, can solve the problems of low leaching rate, high overall energy consumption and high processing temperature, and achieve the effects of saving industrial heat energy, short process flow and high leaching rate

Inactive Publication Date: 2012-04-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if tin anode slime is leached with alkali under normal pressure and normal temperature conditions, the leaching environment is not good due to lack of sufficient thermodynamic conditions and kinetic conditions, and the leaching rate of one of tin, antimony, arsenic, and copper is very low, and cannot achieve mutual separation
The disadvantages of the above process are: complex process, long process, waste liquid pollution, high processing temperature, and high overall energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of the treated tin electrolytic anode slime is shown in the table below:

[0029] sn Pb Cu Sb As SiO 2 Fe Bi Ag Al 2 o 3 50.91 1.96 10.25 11.23 8.27 4.81 1.47 4.84 0.56 0.04

[0030] A. Grind tin electrolytic anode slime to 100 mesh, and mix tin electrolytic anode slime with oxidant NaNO 3 The mass ratio of the tin electrolytic anode slime is 10:7, and the tin electrolytic anode slime is mixed with the oxidant, and then a NaOH solution with a concentration of 170g / L is added until the liquid-solid ratio is 4.7:1 to obtain a slurry;

[0031] B. Put the slurry obtained in step A under pressure and be 24kg / cm 2 , temperature is under 210 ℃, with stirring speed as 200 rev / min, constant temperature reaction obtains stripping slurry after 2 hours; Its purpose is to make the tin, antimony, arsenic, bismuth, copper in the tin electrolysis anode slime obtain sufficient oxidation, It is beneficial for the tin ele...

Embodiment 2

[0035] The composition of the treated tin electrolytic anode slime is shown in the table below:

[0036] sn Pb Cu Sb As SiO 2 Fe Bi Ag Al 2 o 3 44.31 1.70 6.82 15.96 5.78 4.81 1.47 9.05 1.26 0.06

[0037]A. Grind tin electrolytic anode slime to 160 mesh, mix tin electrolytic anode slime with oxidant according to the mass ratio of tin electrolytic anode slime and oxidant NaClO as 15:3, and then add NaOH solution with a concentration of 200g / L until liquid-solid The ratio is 3:1 to obtain slurry;

[0038] B. Put the slurry obtained in step A under pressure and be 35kg / cm 2 , temperature is under 270 ℃, with stirring speed as 100 rev / min, obtain stripping slurry after 1.5 hours of constant temperature reaction; Its purpose is to make tin, antimony, arsenic, bismuth, copper in tin electrolysis anode slime obtain sufficient oxidation, It is beneficial for the tin element to dissolve in the lye;

[0039] C. Filter the stripping s...

Embodiment 3

[0042] The composition of the treated tin electrolytic anode slime is shown in the table below:

[0043] sn Pb Cu Sb As SiO 2 Fe Bi Ag Al 2 o 3 46.45 1.86 8.21 11.56 7.90 4.98 1.29 8.33 1.17 0.05

[0044] A. Grind tin electrolytic anode slime to 260 mesh, and mix tin electrolytic anode slime with oxidant NaClO 3 The mass ratio of the tin electrolytic anode slime is 20:10, and the tin electrolytic anode slime is mixed with the oxidant, and then a NaOH solution with a concentration of 300g / L is added until the liquid-solid ratio is 2.5:1 to obtain a slurry;

[0045] B. Place the slurry obtained in step A at a temperature of 300°C, with a stirring speed of 350 rpm, and react at a constant temperature for 3.5 hours to obtain a solution slurry; the purpose is to make the tin, antimony, arsenic, bismuth , Copper is sufficiently oxidized, which is conducive to the dissolution of tin in the lye;

[0046] C. Filter the stripping slur...

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Abstract

The invention provides a method for separating tin, antimony, bismuth, arsenic and copper from tin electrolytic anode mud. The method comprises the following steps of: grinding the tin electrolytic anode mud finely, mixing the tin electrolytic anode mud with an oxidizing agent, adding a NaOH solution, stirring the mixture at a certain temperature under certain pressure, and thus obtaining dissolved serous fluid; and filtering to obtain a sodium stannate solution, cooling naturally to room temperature, filtering, decomposing the obtained filtrate by introducing carbon dioxide or adding NaHCO3, filtering, and thus obtaining an alkali solution and stannic oxide. By the method, the problem of difficulty in separation of the tin and the antimony in the tin anode mud is solved, and other valuable metals in the tin anode mud can be subsequently recovered smoothly; compared with a method for processing the anode mud by an acid method, the method has the obvious advantage that: the discharging of waste liquid and waste gas is avoided in the process of utilizing the anode mud comprehensively; and the method has a short process, makes simple equipment used, is energy-saving and environment-friendly and is worthy of being applied and popularized.

Description

technical field [0001] The invention relates to an autoclave alkali leaching method, in particular to a method for separating tin from antimony, bismuth, arsenic and copper from tin electrolytic anode slime, and belongs to the fields of heavy nonferrous metal metallurgy and precious metal metallurgy. Background technique [0002] Tin anode slime is a variety of substances that sink to the bottom of the tank during the electrolytic refining process of crude tin. The coarse tin electrolytic anode slime has a high content of tin, antimony, arsenic, copper, and bismuth, and its composition range fluctuates greatly, generally tin 20 ~50%, antimony 7~18%, arsenic 4~8%, copper 8~10%, bismuth 10~20%. [0003] Currently, tin concentrates used for tin smelting have complex components, and tin products can be obtained through processes such as smelting, pyro-refining, and electrolytic purification. For a smelter that smelts complex tin concentrates, if it produces 15,000 to 20,000 ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/12C22B3/44C22B25/00
CPCY02P10/20
Inventor 朱云施哲张彬
Owner KUNMING UNIV OF SCI & TECH
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