Low-grade tin concentrate and low-tin complex materials - high-arsenic antimony tin-mineral separate smelting process

November 15, 2022

At present, the tin- mineral mines produced by various countries' tin- smelting plants are smelted by using tin alloys with higher grades in a matching manner. China has a large number of containing arsenic, antimony high refractory tin, so the late 1970s made many experimental studies. Sulfur vulcanization is very effective in enriching tin, so the process of combining metallurgy and metallurgy is adopted. In the beneficiation process, only a complex tin ore containing arsenic and antimony is produced to increase the recovery rate of tin, and then the complex tin ore is vulcanized in a fumigating furnace to obtain a complex tin soot.

Figure 1 Tin-making process of top converter in Texas Tin Refinery

The handling of complex tin soot is still in the experimental stage and there are several different processes.

One of the processes is shown in Figure 3. The chemical composition (%) of tin used in the test was: 4.96Sn, 4.33Pb, 3.15Sb, 1.77As, 0.025Ag, 0.011In, 0.019Cd, 0.30Cu, 5.99S, 0.30C, 28.95Fe, 0.88CaO, 20.44 SiO ₂ , 3.05Al ₂ O ₃ , the product is sodium stannate.

Figure 2 Siro melting furnace system combination diagram

The second process is shown in Figure 4. The chemical composition (%) of the tin soot used in the test was: 21.26Sn, 17.92Pb, 9.73As, 12.56Sb, 5.03Zn, 0.041Ag, 0.047In, 0.19Cd, 3.79S, 2.63Fe, 0.29CaO, 3.28SiO ₂ . The phase analysis is shown in the table below. Tin-lead alloy products.

Phase analysis of high arsenic and antimony metal tin soot in the table /%

tin		lead		arsenic		antimony		Zinc
Phase	content	Phase	content	Phase	content	Phase	content	Phase	content
SnO SnO ₂ Sn	5.7 87.9 6.2	PbSO ₄ PbO PbS Insoluble slag	25.1 57.1 5.5 11.7	As ₂ O ₃ M3(AsO ₄ ) ₂ As As ₂ S ₃	32.3 57.5 1.9 8.3	Sb ₂ O ₃ Sb ₂ S ₃ M3(SbO ₄ ) ₂	21.6 4.3 74.1	ZnO ZnS Insoluble slag	6.2 84.8 0.9

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Figure 3 complex tin soot smelting - alloy plus alkali smelting - alkali slag flooding

- Leachate purification and concentration process for producing sodium stannate

The third process is shown in Figure 5. The chemical composition (%) of the sample was: 23.28Sn, 11.81Sb, 20.74Pb, 4.79Zn, 0.055Ag, 2.56S, 6.42As, 1.85Fe, 0.004Bi, 0.81CaO, 2.79SiO ₂ , 2.79SiO ₂ , 1.20Al ₂ O ₃ , 0.047In. This is a combination of wet and fire method. The chlorination reduction leaching method is used to completely separate arsenic at one time; and the associated elements such as bismuth, lead, zinc, silver and iron can be completely removed, and then enter the traditional Fire process.

Figure 4: High arsenic bismuth polymetallic tin soot reduction roasting (twice) arsenic removal 锑

Reduction smelting- electrolytic refining process for producing tin-lead alloy

Figure 5 CR (chlorination reduction leaching distillation) treatment

Principle process of high arsenic and antimony metal tin soot

Author:

Mr. Yan

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sales@tinboxtlt.com

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