System and process for treating low-grade tin raw material by reducing roasting

Abstract

The invention discloses a system and process for treating low-grade tin raw materials by reducing roasting. The system for treating low-grade tin raw materials by reducing roasting is characterized inthat low-grade tin raw materials with the tin mass content of 1%-15% are mixed into a reducing agent through a batching system, the low-grade tin raw materials are fed into a rotary kiln for weak reduction roasting, so that SnO2 in the low-grade tin raw materials is converted into volatile SnO to volatilize into a secondary combustion chamber, the SnO is oxidized into the SnO2 in the secondary combustion chamber, and then is cooled by a flue gas cooling system, then a SnO2 product with the tin content of more than 35% is collected in a cloth bag dust collector, tail gas discharged from the cloth bag dust collector is treated by a sulfur dioxide recovery system, and is discharged after reaching the standard; the content of tin contained in furnace slag produced by the rotary kiln is reduced to 0.2% or below, and the furnace slag is fed into a slag bucket. The system and process is energy-saving and environment-friendly, the recovery rate of the tin metal is high, and the comprehensiveutilization effect of resources is good.

Description

technical field [0001] The invention relates to the technical field of tin smelting systems and processes. Background technique [0002] In the production of tin smelting, the smelting of low-grade tin raw materials generally adopts methods such as fuming furnace vulcanization and volatilization, rotary kiln chlorination and volatilization, adding vulcanizing agents or chlorinating agents for volatilization and enrichment, and Ausmelt furnaces are also used to add vulcanizing agent fumes. Volatile enrichment. Fuming furnace and Ausmelt furnace fuming and volatilization belong to melting pool smelting, which needs to melt the material completely, and consider the slag type, and add a suitable flux. At the same time, it needs to add vulcanizing agents such as pyrite. The main problem of volatilization and volatilization in the fuming furnace and Ausmelt furnace is that the amount of flux and vulcanization dose added is large, which dilutes the tin in the material and reduces ...

AI Technical Summary

Problems solved by technology

The main problem of volatilization and volatilization in the fuming furnace and Ausmelt furnace is that the amount of flux and vulcanization dose added is large, which dilutes the tin in the material and reduces the recovery rate of tin; High temperature, high energy consumption, large loss of refractory materials in metallurgical furnaces, and high cost

Rotary kiln chlorination volatilization requires the addition of chlorinating agents. The equipment is severely corroded, and the slag produced contains a large amount of chlorine radicals. The treatment is difficult and the environmental pollution is serious.

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