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Wet processing method for tin-copper slag

A wet processing, tin-copper technology is applied in the field of tin refining and sulfur removal and copper slag treatment. Production cost, the effect of improving the direct yield of tin

Inactive Publication Date: 2018-11-13
云南锡业研究院有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Pyromelting: A certain proportion of flux is mixed in a short kiln for smelting to produce semi-products of tin-copper alloy. Due to the large amount of impurities in the slag entering the alloy, it is difficult to further process the alloy product
[0004] (2) Roasting-leaching method: After the tin-copper slag is roasted, sulfuric acid is used to leaching the calcine, so that copper is opened from the tin smelting system in the form of copper sulfate products. This method has a low softening point of the tin-copper slag due to the existence of a large amount of metallic tin. , it is necessary to carry out multi-stage roasting to achieve the purpose of roasting without kiln formation and desulfurization, so that the roasting time is very long and the processing cost is high
Due to the existence of powdery copper sulfide in this method, the direct recovery rate of tin during electrolysis is low, and the current efficiency is low, resulting in poor economic benefits.
[0006] (4) Full wet process: Some researchers have conducted research on the full wet process of tin-copper slag, which is to decompose the tin-copper slag with hydrochloric acid, so that all the components in the slag enter the solution, and then carry out the treatment of each element in the solution. The separation of the method has the disadvantages of lengthy process flow and complicated process.
[0007] (5) fire-wet process: Tang Yunsheng, Li Yuanchang, Zhang Xionglin, Yang Chenglin, etc. proposed a treatment method for tin-copper slag, patent publication number CN1786226, using sulfuric acid for one-stage leaching, and the obtained stannous sulfate solution can be purified to obtain high-grade For stannous sulfate products, the first-stage leaching slag is oxidized and roasted, and then the sulfuric acid is leached in the second-stage to obtain a copper sulfate solution. The concentrated crystallization can produce copper sulfate products or enter the copper electrolysis system to produce copper. The second-stage leaching slag is the tin concentrate and returns to tin smelting system, this method has the disadvantage that the amount of metallic tin returned to tin smelting is relatively high

Method used

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  • Wet processing method for tin-copper slag

Examples

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Effect test

Embodiment 1

[0020] (1) With 10.03% of copper, 500g of tin-copper slag containing 58.36% of tin, adopt sulfuric acid pressure leaching, leaching condition: add cupric chloride by 2% of tin-copper slag quality, sulfuric acid initial acidity 100g / l, sulfuric acid and The liquid-solid mass ratio of tin-copper slag is 4:1, the reaction temperature is 120-130°C, oxygen is passed through the reaction process, the kettle pressure is 0.8MPa, and the reaction time is 6 hours to obtain 1.85L containing Cu22.46g / l and Sn0.042g / l Copper sulfate solution and 466g leaching residue containing Sn62.14%, Cu1.92%;

[0021] (2) the copper sulfate solution of leaching is returned airtight container again with new tin-copper slag material, feeds oxygen again and pressurization, heating repeats leaching twice, obtains the copper sulfate solution of 1.8L copper 65.14g / l, will Copper sulfate solution is evaporated and concentrated, cooled and crystallized, and centrifuged to obtain 402g of copper sulfate product ...

Embodiment 2

[0023] (1) 500g of tin-copper slag containing 18.23% of copper and 50.31% of tin is used for pressure leaching with sulfuric acid, and the leaching conditions are: add copper chloride according to 5% of the mass of tin-copper slag, the initial acidity of sulfuric acid is 150g / l, liquid-solid The mass ratio is 5:1, the reaction temperature is 140-150°C, oxygen is passed through the reaction process, the kettle pressure is 1.5MPa, and the reaction time is 4 hours, 2.32L copper sulfate solution containing Cu36.85g / l, Sn0.023g / l and 446g The leaching residue containing Sn54.14%, Cu1.62%.

[0024] (2) Return the copper sulfate solution to leaching once to obtain 2.3L copper sulfate solution containing 59.38g / l of copper. After evaporation and concentration, cooling and crystallization, centrifugation obtains 488g of copper sulfate product and 500ml of crystallization mother liquor. The crystallization mother liquor can be returned to oxygen Pressure leaching, the obtained copper su...

Embodiment 3

[0026] (1) 500g of tin-copper slag containing 30.23% of copper and 59.25% of tin is leached under pressure with sulfuric acid. The solid ratio is 8:1, the reaction temperature is 190-200°C, oxygen is passed through the reaction process, the kettle pressure is 2MPa, and the reaction time is 2 hours, 3.72L copper sulfate solution containing Cu39.41g / l, Sn0.018g / l and 424g containing Sn68.82%, Cu1.42% leaching residue.

[0027] (2) Return the copper sulfate solution to leaching once again to obtain 3.7L copper sulfate solution containing 65.34g / l of copper. After evaporation and concentration, cooling and crystallization, centrifugation obtains 844g of copper sulfate product and 500ml of crystallization mother liquor. The crystallization mother liquor can be returned to oxygen pressure Leaching, the obtained copper sulfate product contains copper sulfate pentahydrate 97.24%, Sn0.001%, Pb0.0011%, As0.002%, Fe0.025%, free acid 0.058%, water insoluble matter 0.016%.

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Abstract

The invention relates to a wet processing method for tin-copper slag. The method comprises the following steps that sulfuric acid and the tin-copper slag are put into a closed container according to aratio, and copper chloride is added according to 2-10 wt.% of the adding amount of the tin-copper slag; then oxygen is introduced into the closed container and pressurizing and heating are carried out, so that the tin-copper slag and the sulfuric acid are fully reacted under the action of an additive; a liquid-solid mass ratio of the sulfuric acid to the tin-copper slag is 4-8:1, and an initial acidity of a sulfuric acid solution is 100-200 g / l; the reaction pressure of the closed container is 0.8-2 Mpa, the reaction temperature is 120-200 DEG C, and the reaction time is 2-8 hours; and afterthe reaction is finished, solid-liquid separation is carried out, the leaching liquid is a copper sulfate solution, a copper sulfate product is obtained after concentrating and crystallizing, and theleaching residue is tin concentrate. According to the wet processing method for the tin-copper slag, the tin and the copper can be effectively separated, so that an open way of the copper is formed ina tin smelting system, and the processing cost of the tin-copper slag is reduced.

Description

technical field [0001] The invention belongs to the technical field of treatment methods for tin refining sulfur addition and copper removal slag. Background technique [0002] In the tin smelting process, after the tin concentrate is reduced and smelted into crude tin, due to the presence of copper in the tin smelting raw materials, the copper content in the crude tin is relatively high. Therefore, sulfur addition and copper removal operations are required to form a Tin-copper slag (also known as sulfur slag) with 10-30% copper and 30-80% tin. Most of the tin in this slag exists in the form of metal, oxide or alloy, and most of the copper exists in the form of copper sulfide. There are mainly the following methods for the treatment of such tin-copper slag at home and abroad: [0003] (1) Pyromelting: A certain proportion of flux is added to smelt in a short kiln to produce a semi-product of tin-copper alloy. Because a large amount of impurities in the slag enter the alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B25/06
CPCC22B7/007C22B7/04C22B15/0071C22B25/04C22B25/06Y02P10/20
Inventor 苏瑞春张旭李发祥李学鹏黄迎红
Owner 云南锡业研究院有限公司
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