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
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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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