Method for roasting tin-containing high-arsenic and high-sulfur material by fluidized rich oxygen

Abstract

The invention belongs to the technical field of tin metallurgy, in particular relates to a novel method for roasting a tin-containing high-arsenic and high-sulfur material by fluidized rich oxygen. The method comprises the following steps of: mixing oxygen into a charged gas of a fluidized furnace; controlling the oxygen quantity to reach 22-45 wt% of the total charged gas; carrying out oxygen-enriched fluidized roasting on the material at 600-1000 DEG C; and adding the oxygen in such a way that the quantity of the charged air is gradually reduced and the oxygen quantity is gradually increased so that the total charged gas is invariable and the oxygen concentration satisfies the process parameters while a charging system is started for charging. According to the invention, the arsenic and sulfur removing rate can be effectively increased, the roasting quality can be improved, the smoke gas quantity generated by treatment of the unit material can be reduced, the heat loss can be reduced, the heat utilization rate can be increased, the furnace hearth capacity can be improved without increasing the area of the furnace hearth, the treatment quantity can be increased and the production efficiency can be enhanced; meanwhile, the concentration of SO2 in the smoke gas can be increased so that the problems of low SO2 concentration in the tail gas, unfavorable acid making and environment pollution can be solved to change the harm into the treasure in the tail gas acid making.

Description

technical field [0001] The invention belongs to the technical field of tin metallurgy, and in particular relates to a new method for roasting tin-containing, high-arsenic and high-sulfur materials with fluidized oxygen-enriched. Background technique [0002] With the continuous mining of tin deposits, the grade of tin ore is gradually declining, and the high-impurity tin ore such as high sulfur and high arsenic is gradually increasing; and with the continuous mining of tin resources, the intermediate products (alloy slag and smelting dust) in the tin smelting production process And the tin-containing waste recovered from other tin chemical industry, tin material production, electronic welding and electroplating and other tin deep-processing enterprises or users has become the main raw material for tin smelting production together with tin concentrate. If these materials are directly smelted, on the one hand, due to their high impurities, the loss of tin during the smelting p...

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Problems solved by technology

[0006] Another object of the present invention is to increase the capacity of the hearth without increasing the area of ​​the hearth, increase the processing capacity, increase the production efficiency, and simultaneously increase the amount of SO in the flue gas. 2 Concentration, for the tail gas acid to turn harm into treasure to solve the tail gas SO 2 The low concentration of acid production is unfavorable to the problem of polluting the environment

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