Method for treating tin-copper slag through whole wet method

An all-wet, tin-copper technology, applied in the field of tin refining and copper slag removal, can solve the problems of poor economic benefit, long process flow, low softening point of tin-copper slag, etc., and achieve the effects of reduced production cost and simple and feasible process.

Active Publication Date: 2018-08-03
云南锡业研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 o

Method used

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  • Method for treating tin-copper slag through whole wet method
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  • Method for treating tin-copper slag through whole wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for treating tin-copper slag by an all-wet method, the method steps are as follows:

[0022] (1) 500g of tin-copper slag containing 10.2% copper and 50.6% tin is leached under pressure with sodium hydroxide, leaching conditions: initial alkalinity of sodium hydroxide 100g / l, liquid-solid mass ratio 6:1, reaction temperature 120~130°C, oxygen flow during the reaction process, the pressure of the kettle is 1MPa, and the reaction time is 4 hours to obtain 2.85L sodium stannate solution containing Sn76.49g / l and Cu3.57g / l and 170g containing Sn20.58%, Cu24. 01% leaching residue.

[0023] (2) the sodium stannate solution in the above-mentioned steps (1) is through adding tin to remove antimony copper, adding sodium sulfide to remove lead and then evaporating and concentrating, cooling and crystallizing to obtain sodium stannate product 382g, and product quality is as follows.

[0024] Table 1 Sodium stannate product quality Unit: %

[0025]

[0026] (3) After w...

Embodiment 2

[0029] A method for treating tin-copper slag by an all-wet method, the method steps are as follows:

[0030] (1) 500g of tin-copper slag containing 20.6% of copper and 65% of tin is leached with sodium hydroxide under pressure, leaching conditions: initial alkalinity of sodium hydroxide 200g / l, liquid-solid mass ratio 7:1, reaction temperature 140~150°C, oxygen flow during the reaction process, the pressure of the kettle is 1.6MPa, and the reaction time is 2 hours to obtain 3.2L sodium stannate solution containing Sn95.94g / l, Cu3.24g / l and 145g containing Sn12.41%, Cu63 .44% leach residue.

[0031] (2) the sodium stannate solution in the above-mentioned steps (1) is through adding tin to remove antimony copper, adding sodium sulfide to remove lead and then evaporating and concentrating, cooling and crystallizing to obtain sodium stannate product 582g, and product quality is as follows.

[0032] Table 1 Sodium stannate product quality Unit: %

[0033]

[0034] (3) After wa...

Embodiment 3

[0037] A method for treating tin-copper slag by an all-wet method, the method steps are as follows:

[0038] (1) 500g of tin-copper slag containing 10.2% copper and 79.9% tin is leached under pressure with potassium hydroxide, leaching conditions: initial alkalinity of potassium hydroxide 60g / l, liquid-solid mass ratio 12:1, reaction temperature 110~120°C, oxygen flow during the reaction process, the pressure of the kettle is 2MPa, and the reaction time is 6 hours to obtain 2.78L potassium stannate solution containing Sn79.50g / l, Cu3.21g / l and 165g leaching residue containing Sn19.40%, Cu25.50%.

[0039] (2) Potassium stannate product 424g is obtained after adding tin and removing antimony copper in the above-mentioned steps (1), adding sodium sulfide to remove lead, and obtaining potassium stannate product 424g after crystallization by cooling.

[0040] Table 1 Potassium stannate product quality Unit: %

[0041]

[0042] (3) After washing the leaching residue of the abov...

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Abstract

The invention discloses a method for treating tin-copper slag through a whole wet method. The method comprises the following steps of: performing oxygen-pressure alkaline leaching on tin-copper slag through sodium hydroxide or potassium hydroxide, wherein a liquid-solid mass ratio is (3-12) to 1, initial alkaline concentration of alkaline liquor is 60-200g/l, reaction temperature ranges from 110 DEG C to 150 DEG C, reaction is performed for 2-6 hours, and reaction pressure is 1-2 MPa; getting leach liquor which is a sodium stannate solution or a potassium stannate solution, adding tin to replace stibium and copper, adding sodium sulfide to remove lead, purifying the solution, evaporating, concentrating, cooling and crystallizing the purified solution to obtain a stannate product; washing leach residues, performing sulfuric acid normal-pressure leaching, and separately generating a secondary leach liquor copper sulfate solution and secondary leach residue tin concentrate, wherein acidity of H2SO4 is 50-150g/l, a liquid-solid mass ratio is (2-10) to 1, and a leaching temperature is 40-95 DEG C; evaporating, concentrating, cooling and crystallizing the copper sulfate solution to obtain a copper sulfate product, drying and returning the tin concentrate to a tin smelting system. The method can generate a stannate product, and also can effectively separate copper in the tin-copper slag.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and chemical industry, and in particular relates to a method for removing copper slag from tin refining. Background technique [0002] In the tin smelting process, after the tin concentrate is reduced and smelted into crude tin, due to the existence of copper in the tin smelting raw materials, the copper content in the crude tin is relatively high. Tin-copper slag (also known as sulfur slag) with a tin content of 10-30% and a tin content of 30-80%. 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, it is dif...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B25/06C22B15/00
CPCC22B7/007C22B7/008C22B7/04C22B15/0065C22B15/0071C22B25/04C22B25/06Y02P10/20
Inventor 苏瑞春李发祥张旭李学鹏季登会
Owner 云南锡业研究院有限公司
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