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Method for selectively leaching tin from tin-containing metallurgical slag

A metallurgical slag and selective technology, which is applied to the recovery of tin from tin-containing metallurgical slag, and the field of selective leaching of tin, can solve the problems of equipment corrosion, harsh reaction conditions, high energy consumption, etc., and achieve the ability to avoid decline, high leaching rate, Simple operation effect

Active Publication Date: 2022-03-18
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid process has the disadvantages of harsh acid leaching conditions, serious corrosion of equipment by HCl, and many impurity elements in the leachate
[0006] In summary, there are disadvantages in the prior art, such as harsh reaction conditions, complex and cumbersome subsequent separation process, poor selectivity to tin, high energy consumption, serious pollution and high equipment requirements.

Method used

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  • Method for selectively leaching tin from tin-containing metallurgical slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Wash the tin-containing metallurgical slag with water, dry it at 100°C for 12 hours, mechanically crush it until the particle size is less than 0.75 μm, accounting for 60% to 80%, and obtain the tin-containing metallurgical slag powder (the composition is shown in Table 1); Add it to a mixed solution of 20g / L oxalic acid and 0.5mol / L sulfuric acid, and leaching and reacting at 60°C for 30 minutes; after the reaction is completed, filter out the residue and leachate, and collect the tin-containing leachate.

[0024] The concentration of each element in the leaching solution was measured and the leaching rate was calculated. The leaching rate of Sn was 96.9%, the leaching rate of Fe was 15.5%, and the leaching rate of Ca, Zn, Pb, Al, and Mg was less than 3%.

[0025] Table 1 Composition of a tin-containing metallurgical slag, wt.%

[0026]

Embodiment 2

[0028] The tin-containing metallurgical slag was treated with 0.25mol / L H 2 SO 4 Wash, dry at 100°C for 12 hours, and mechanically crush until the particle size is less than 0.75 μm, accounting for 60% to 80%, to obtain tin-containing metallurgical slag powder (the composition is shown in Table 1); then add this powder to 15g / L oxalic acid , 10g / L citric acid and 0.5mol / LH 2 o 2 In the mixed solution, leaching reaction was carried out at 80°C for 30 minutes; after the reaction was completed, the residue and leachate were filtered out, and the tin-containing leachate was collected.

[0029] The concentration of each element in the leaching solution was measured and the leaching rate was calculated. The leaching rate of Sn was 98.1%, the leaching rate of Fe was 5.6%, and the leaching rate of Ca, Zn, Pb, Al, and Mg was less than 3%.

[0030] At the same time, without adding 0.5mol / LH 2 o 2 As a control, the tin-containing metallurgical slag was leached according to the above s...

Embodiment 3

[0032] Use 0.25mol / LH of tin-containing metallurgical slag 2 SO 4 Wet grinding, the mineral water (acid) ratio is 1:1, the pellet ratio is 10:1, and the time is 15 minutes to obtain tin-containing metallurgical slag powder (the composition is shown in Table 1), of which the particle size is less than 0.75 μm accounting for 60% to 80%; Add this powder to 30g / L tartaric acid, 5g / L tannic acid and 0.5mol / L H 2 SO 4 In the mixed solution, leaching reaction was carried out at 90°C for 1 hour; after the reaction was completed, the residue and leachate were filtered out, and the tin-containing leachate was collected.

[0033] The concentration of each element in the leaching solution was measured and the leaching rate was calculated. The leaching rate of Sn was 96.5%, the leaching rate of Fe was 6.6%, and the leaching rate of Ca, Zn, Pb, Al, and Mg was less than 3%.

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Abstract

The invention discloses a method for selectively leaching tin from tin-containing metallurgical slag, which comprises the following steps: carrying out leaching reaction on tin-containing metallurgical slag powder and a leaching agent containing organic carboxylic acid, and carrying out solid-liquid separation to obtain a tin-containing leachate; according to the method, the tin in the tin-containing metallurgical slag can be efficiently enriched and separated, the extraction rate of the tin is higher than 95%, the tin leaching selectivity is good, the types of the tin-containing metallurgical slag capable of being treated are wide, the method is environmentally friendly, operation is easy, the production cost is low, and the method can be used for industrial production.

Description

technical field [0001] The invention relates to a method for recovering tin from tin-containing metallurgical slag, in particular to a method for selectively leaching tin from tin-containing metallurgical slag, and belongs to the field of hydrometallurgy. Background technique [0002] Tin is one of the earliest metals produced and used by humans. It has a low melting point, can form alloys with various metals, is non-toxic, corrosion-resistant, has good ductility and beautiful appearance. As a rare and expensive heavy metal, tin has a single type of valuable tin minerals. Currently, there are more than 50 kinds of tin minerals, but only cassiterite and phryotinite have industrial application value. About 95% of metallic tin comes from cassiterite. With the continuous development of the economy, the consumption of tin is also increasing year by year, and both at home and abroad are facing the difficult situation of declining tin ore grade, insufficient follow-up resources, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B25/06
CPCC22B7/04C22B7/007C22B25/04C22B25/06Y02P10/20
Inventor 韩桂洪黄艳芳刘兵兵孙虎王益壮
Owner ZHENGZHOU UNIV
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