一种流态化富氧焙烧含锡高砷高硫料的方法

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.
本发明属于锡冶金技术领域,具体涉及一种用流态化富氧焙烧含锡高砷高硫料的新方法。本方法在流态化炉的入炉气体中混进氧气,控制氧量达到入炉总气量的22wt%~45wt%,与物料一起在600℃~1000℃的温度条件下进行富氧流态化焙烧,启动加料系统投料时,加氧方式采取递减入炉空气量,递增氧气量,达到入炉总气量不变而氧气浓度符合所述工艺参数。本发明可有效提高脱砷、脱硫率,改善焙烧质量,降低单位物料处理的烟气量,减少热量损失,提高热利用率,能在不增加炉床面积的情况下,提高炉床能力,提高处理量,提高生产效率,同时提高烟气中SO2的浓度,为尾气制酸变害为宝解决尾气SO2的浓度低制酸不利污染环境的问题。

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Patent Citations (2)

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    CN-101082078-ADecember 05, 2007中国黄金集团公司技术中心一炉两段沸腾焙烧工艺
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Cited By (2)

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    CN-103725900-AApril 16, 2014灌阳县贵达有色金属有限公司一种锡精矿脱砷脱硫的方法
    CN-103725900-BJune 17, 2015灌阳县贵达有色金属有限公司一种锡精矿脱砷脱硫的方法