Novosibirsk Tin companies to handle high, medium and low-grade tin concentrates. High-grade and medium-grade concentrates are smelted with electric furnaces and reverberatory furnaces, and low-grade concentrates are enriched with smoulders. The adult concentrates entering the plant are shown in the table below. The coarse concentrate is concentrated in the beneficiation workshop, and the tailings are generally not lost. In addition to producing rich concentrates, mud concentrates are also produced (including 5%-10% to 20%-30% tin).
Table of raw concentrates of New Siberian Tin Company entering the plant /%
Coarse concentrate category | Sn | Fe | Pb | Zn | Cu | As | ||||
No. 1 sand and tin concentrate | 40.3 | 7.5 | 0.1 | 0.2 | 0.1 | 0.3 | ||||
No. 2 sand tin coarse concentrate | 57.6 | 4.8 | 0.1 | 0.1 | 0.1 | 0.4 | ||||
No. 1 vein tin concentrate | 17.7 | 22.2 | 1.6 | 0.5 | 0.2 | 1.1 | ||||
No. 2 vein tin concentrate | 27.1 | 12.0 | 1.3 | 2.7 | 0.5 | 1.9 | ||||
Coarse concentrate category | S | Sio 2 | Al2O3 | CaO | WO 3 | |||||
No. 1 sand and tin concentrate | 0.9 | 24.6 | 7.0 | 0.2 | 0.7 | |||||
No. 2 vein tin concentrate | 1.8 | 8.0 | 5.2 | 1.0 | 1.6 | |||||
No. 1 vein tin concentrate | 1.2 | 22.3 | 8.2 | 0.2 | 0.2 | |||||
No. 2 vein tin concentrate | 9.5 | 22.9 | 6.2 | 2.0 | 0.3 | |||||
As Russia sand tin few resources, must be complex multi-metal mining tin ore veins, so since the late 1970s, a combination of research tin ore dressing and smelting process in 1985 after the formation of the flow shown in Figure 1. The concentrate treated by this process contains (%): 16.28Fe, 0.68Pb, 0.47Zn, 0.36Cu, 0.05Bi, 0.025Sb, 2.6As, 6.3S, 1.16WO 3 in addition to the tin and gangue components. The main part of the ore concentrate is selected to obtain a concentrate containing 57%-59% of tin, this concentrate and sand-rich concentrate (62%-68%Sn) and vulcanized fuming volatiles (smoke dust) Send it together to smelt the rough tin. The selected lean concentrate (10%-15%Sn) is sent to the smelting treatment together with the slime (9%-12%Sn) and the concentrate smelting slag.
Figure 1 Newly combined with the Siberian tin company
Most part of the rich concentrates and concentrates before smelting with arsenic-containing dross refining plant with oxidation, reduction roasting, arsenic is obtained, the total sulfur content of not more than 1.0% of the calcine, and then sent to the melting or fumed. In addition, the selected workshop also recycles most of the tin from the slime and quartz tailings that were previously discharged to the tailings dam, and becomes a quartz cassiterite mixed medium ore (4%-6%Sn, 0.5%-0.7%As). The fuming method is enriched to obtain fumed dust (50%-60Sn, 1%-2% As) which can be directly smelted into crude tin.
In the process shown in Figure 1, the concentrate reduction smelting adopts two schemes, which are different in equipment configuration and process system: rich concentrate and fumed dust are semi-continuously smelted in brick-lined electric furnace, and output rich slag (up to 20% Sn); lean ore concentrate and intermittently melted in an electric furnace carbon lining, yielding spoil (up to 1.0% Sn), and tin-containing silicon-iron (3% -6% Sn).
The main disadvantages of the production of waste smelting are: (1) high power consumption; (2) the use of expensive silicon alloys to reduce all iron; (3) the high yield of secondary tin-containing ferrosilicon; (4) lining Short life; (5) The slag is high in tin.
In view of the shortcomings described in 1985-1987, the process shown in Figure 2 was developed and used in industrial production in 1988. The results show that regardless of the structure and quality of the raw materials, it can ensure that the crude tin containing 0.5%-1% of iron is produced in the semi-continuous melting of the tin-rich raw materials, and the slag contains 10%-12% of tin; (Continuous smelting of rich slag and medium ore produces 3%-5% of crude tin containing iron, 6%-8% of slag containing tin, and the slag is sent to the smelting furnace together with the ore in the liquid state, which is lower than 0.15% Sn of waste slag).
Figure 2 New Siberian Tin Company Electric Furnace - Cigarette Process
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