Research on dechloridation process of lead chloride slag

Abstract

The invention relates to a method for smelting non-ferrous metals, and in particular relates to research on a dechloridation process of lead chloride slag. The shortcomings of the prior art are overcome by the dechloridation process provided by the invention; the novel method, by which chlorine is removed before the lead chloride slag is introduced into a reverberatory smelting step, is provided; the efficient removal of the chlorine inside the lead chloride slag is achieved by means of novel process design; the smelting direct yield rate is increased; the corrosion of a hearth and a steel fume pipe by chlorine gas is reduced; the tail gas exhaust standard can meet the state environmental protection requirements.

Description

technical field [0001] The invention relates to a nonferrous metal smelting method, in particular to the research on a dechlorination process of lead chloride slag. Background technique [0002] The main metal elements recovered from lead chloride slag are lead, silver and copper, and their grades have high economic value. At present, the main way to deal with lead chloride slag is to use a reverberatory furnace at a temperature of 950-1250°C to add lime to produce calcium chloride slag and add reduced coal to reduce and smelt lead to produce crude lead with a lead content of about 97%. Valuable metals are thereby enriched. [0003] Chlorine gas overflows during the smelting process of lead chloride slag, which not only takes away valuable metals such as lead and silver and reduces the direct yield of smelting, but also severely corrodes the furnace and steel smoke pipes, and at the same time, chlorine gas will also seriously pollute Atmospheric Environment. [0004] In v...

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Problems solved by technology

[0003] Chlorine gas overflows during the smelting process of lead chloride slag, which not only takes away valuable metals such as lead and silver and reduces the direct yield of smelting, but also severely corrodes the furnace and steel smoke pipes, and at the same time, chlorine gas will also seriously pollute Atmospheric Environment

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