Method for extracting indium and recovering valuable metals from flue dust of tin

A valuable metal, smoke and dust technology, applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of tin system production hazards, many impurity elements, low grades, etc., to improve the comprehensive recycling rate of resources, advanced technology , the effect of short process

Active Publication Date: 2010-02-10
YUNNAN TIN GROUP HLDG
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Tin fume contains high tin, many impurity elements, complex components, and relatively low grade. The tin fume from most manufacturers is recycled as returned products. The content of impurity elements in the dust is getting higher and higher. If it is not treated, not only The production of tin system is potentially harmful, and causes waste of secondary resources and long-term environmental pollution

Method used

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  • Method for extracting indium and recovering valuable metals from flue dust of tin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition is (%) Sn53.25, Pb4.25, As6.25, Fe1.05, Cu0.019, Zn5.61, In0.137, Cd5.16, Bi0.232, S0.598 Ausmelt refining A total of 18.55 tons of materials were put into the trial production of tin fumes, and 18.77kg of sponge indium products were produced, which contained 92.70% of indium, and the direct yield of indium was 68.46%.

[0023] (1) Intermediate leaching: Use the raffinate containing indium-tin fume to adjust the initial acid pH to 1, the liquid-solid ratio (V / W) = 4:1, and the normal temperature and leaching temperature to be 50°C to 60°C. Under stirring and leaching for 4 hours, control the final acid pH = 2-2.5. As, Cd, Zn and other impurity elements enter the leaching solution, with P 507 The zinc in the leaching solution is extracted, and the zinc recovery rate is 98%. Sn, Pb, In into leaching slag, indium-rich slag secondary acid leaching.

[0024] (2) Acid leaching: The indium-rich slag leached from (1) is stirred and leached for the second time...

Embodiment 2

[0030] The composition is (%) Sn26.27, Pb5.55, As5.34, Fe1.35, Cu0.069, Zn15.75, In0.415, Cd1.13, Bi0.191, S1.33 electric furnace tin smelting smoke, test A total of 19.60kg of material was input, and 65.36g of sponge indium product was produced, which contained 92.40% of indium, and the direct yield of indium was 74.24%.

[0031] (1) Intermediate leaching: the indium-containing tin fume is leached for 40 minutes at room temperature with the raffinate after extraction of indium to adjust the initial acid pH=2.5, the liquid-solid ratio (V / W)=7:1, and control the final acid pH= 3~4. Zn, As, Cd, Fe and other impurity elements enter the leaching solution, the leaching rate of Zn is more than 80%, and the leaching rate of As, Cd, Fe is more than 90%. with P 507 The zinc in the leaching solution is extracted, and the zinc recovery rate is 98%. Sn, Pb, In into leaching slag, indium-rich slag secondary acid leaching.

[0032] (2) Acid leaching: The indium-rich slag leached from (1...

Embodiment 3

[0038] The composition is (%) Sn51.63, Pb4.6, As5.62, Fe0.755, Cu0.0394, Zn5.82, In0.291, Cd4.98, Bi0.231, S0.935 tin fume, the test total 48.0kg of material was input, and 115.78g of sponge indium product was produced. The product contained 90.15% of indium, and the direct yield of indium was 74.72%.

[0039] (1) Intermediate leaching: use the indium-containing tin fume to adjust the initial acid pH to 1.5 with the raffinate after indium extraction, the liquid-solid ratio (V / W) = 5:1, and stir at the leaching temperature of 50°C to 60°C Leach for 3 hours, and control the final acid pH=2.5. The leaching rates of As, Cd and Zn are all greater than 85%. 507 The zinc in the leaching solution is extracted, and the zinc recovery rate is 98%. Sn, Pb, In into leaching slag, indium-rich slag secondary acid leaching.

[0040] (2) Acid leaching: The indium-rich slag leached from (1) is stirred and leached for the second time, the initial concentration of the sulfuric acid solution is...

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Abstract

The invention relates to a method for extracting indium and simultaneously recovering valuable metals such as tin, lead, zinc, cadmium and the like from flue dust of smelted tin. The method comprises:adopting twice leaching: neutral leaching-acid leaching, and firstly leaching part of impurity elements such as arsenic, cadmium, zinc and the like in the flue dust of tin into the neutral leaching liquid under the condition of neutral normal temperature or low temperature; then, acidic twice leaching neutral leaching residue, leaching indium and residual part of impurity elements again, and entering high temperature leaching liquid; washing high temperature leaching residue, and then recovering tin and lead. P204 is adopted for extracting the indium in the high temperature leaching liquid, hydrochloric solution is used for back-extraction enrichment, and zinc blocks are used for replacing, so that the product sponge indium can be obtained and has the indium content of 92.70%; raffinate obtained after the indium is extracted by the P204 returns to neutral leaching or acid leaching to be taken as leaching preparation liquid; zinc in the neutral leaching liquid is extracted by P507, sulfuric acid solution is processed by back-extraction enrichment, evaporation, concentration and crystallization, so that industrial first-grade product ZnSO4.7H2O can be obtained.

Description

technical field [0001] The invention relates to a method for comprehensive recovery and utilization of secondary materials in smelting, in particular to a method for extracting indium from tin fume and simultaneously recovering valuable metals such as tin, lead, zinc and cadmium. Background technique [0002] Indium is a typical scattered element, and its content in the earth's crust is about 1.4×10 -5 %, dispersed in ores of copper-loving elements. Indium is mainly recovered from slag, anode slime, soot, etc. as a by-product of tin, lead, and zinc smelting. During the reduction smelting process of tin, its distribution ratio in slag, anode slime, and soot is 42.73 % (the distribution ratio of the total indium in the furnace tin raw material in the soot). [0003] Tin fume is one of the raw materials for extracting indium. The general composition of tin fume is (wt%): Sn23~55, Pb2~5, As1~5, Fe0.7~6.5, Cu0.03~0.1, Zn4~20, In0. 1~0.7, Cd1~6, Bi0.1~0.2, Sb0.3~0.7, S0.5~0.9. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B58/00C22B25/06C22B13/00C22B3/06C22B3/04C22B3/38C25C1/16
CPCY02P10/20
Inventor 刘瑞琼宋兴诚杨艳兰
Owner YUNNAN TIN GROUP HLDG
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