Complex tin soot comprehensive recovery tin process

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.

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 1. 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.

FIG smelting smoke tin complex 1 - melting alloy alkali - sodium flooding Alkali leaching solution purification and concentration of tin production process

The second process is shown in Figure 2. 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. The product is tin- lead alloy.

Fig. 2 Process of reduction and roasting of high arsenic and antimony polymetallic tin soot (twice) arsenic removal-reduction smelting-electrolytic refining production of tin-lead alloy

Phase analysis of high arsenic bismuth polymetallic tin soot /%

The third process is shown in Figure 3. 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.

Fig. 3 Principle process of treatment of high arsenic and antimony polymetallic tin soot by CR (chlorination reduction leaching distillation)