Tin Smelting Process Diagram

Tin ore is cassiterite (SnO2), there is the formation of veins of tin and its outflow mountain piled sand tin. After beneficiation available containing Sn40-70% of tin concentrate. Lead and tin are used pyrometallurgical, lead concentrate is subject to roasting, sintering becomes oxide, tin concentrate is used directly, are obtained by reduction smelting of lead and tin. When it is difficult to get rid of sulfur smelting lead, and tin smelting slag was reported missing at large, not yet adopted hydrometallurgy. Here is tin smelting process diagram.

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1, pretreatment of tin concentrates in addition to containing SnO2, but also contains WO3, S, Cu, Pb, Fe, etc. Therefore, as far as possible before the smelting of these impurities removed. In 800-1150K oxidation roasting, you can get rid of sulfur, antimony, arsenic, and then add 10% Na2 CO3 were baking soda, tungsten leach into water-soluble Na2WO4 removed. This leaching solution by adding purified CaCI2 precipitated CaWO4. As the metal tungsten raw materials, copper, plus NaCI presence of lead removed after 870K chlorination roasting.

2, when the ore smelting tin smelting slag is easy to enter, so the two-step reduction smelting. First, do not consider the recovery of ore smelting, just to get a high grade crude tin (tin containing about 90%) can be electric or reflection furnace, this time, the composition of the slag was 10-15% Sn, 13-20% Fe, 20-28 % SiO2,5-7% AL2O3 2-8% CaO.

3, tin smelting slag from the ore for smelting to add coke, limestone smelting reduction, obtained in less than 1% tin slag and hard head (for example, 46% Sn, 44% Fe). The head can also be hard to return ore smelting. When added as coke, silica sand, the further reduction of smelting in an electric furnace (1800K), is composed of iron Fe-Si alloys, crude tin can (about 90% Sn) separation.

4, crude tin stove in a small reflection on "500-800K segregation, and the most part of the same iron, arsenic residue in hard head. Taken from the molten tin pots, blowing air or steam oxidation, the iron, zinc , lead, arsenic and floating scum formation would get rid of it, cast tin anode (97% Sn), sent to the electrolytic refining. smelting sand containing less impurities tin. tin get up to 99.8-99.9%, and can the sale of electrolytic refining, with SnSiF6 + H2SiF6 + H2SO4 electrolyte (Sn20-30kg / m3, free H2SiF6 35-40% kg / m3, free H2S04 40-45kg / m3). current density with tin grade varies, typically 50-70A / m2. electrolysis wish a purity of 99.99%, after the anode mud washed with H2SO4 leaching, electrolytic tin made.

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