Crude lead continuous refining furnace and refining method

Abstract

The invention discloses a wet lead continuous refining furnace and a continuous refining method. The wet lead continuous refining furnace comprises a furnace body and a circulation cooling device, wherein the circulation cooling device is arranged outside the furnace body and comprises a circulating tank, a cooling chute and a refluxing tank which are sequentially communicated, the circulating tank and the refluxing tank are respectively communicated with a molten pool circulating region and a return region of the furnace body, a wet lead flow-in port and a furnace slag and copper matte discharging hole are formed in the end wall of the furnace body, a siphon lead discharging hole is formed in the side wall, and a fuel nozzle is connected with furnace top. By virtue of circulation cooling and flowing of lead liquid, the furnace slag and copper matte which are floating on the surface of the lead liquid are produced, and downward flame produced by the fuel nozzle in the furnace top is used for heating, so that the furnace slag and the copper matte are discharged in a molten state, temperature of the upper part of a molten pool is higher than that of the lower part of the molten pool, copper content in the copper matte is increased, lead content in the copper matte and the furnace slag is increased, and efficiency for removing copper and impurities in wet lead is improved. The lead liquid in the molten pool is continuously circulated and cooled by virtue of a circulation cooling device and is heated by virtue of the furnace top, and wet lead fire refining continuous operation and high copper and impurity removal rate are realized.

Description

technical field [0001] The invention relates to a crude lead refining technology, in particular to a crude lead continuous refining furnace and a method for refining crude lead using the refining furnace. Background technique [0002] Lead smelting At present, most of the world's mineral crude lead adopts the preliminary pyro-refining + electrolytic refining process, and almost all the crude lead produced in my country is refined by this process. The crude lead produced by smelting generally has a lead grade of 90% to 98%, and contains Ag, Au and other precious metals and Cu, As, Sb, Sn, Bi, S and other impurity elements, of which Cu0.1% to 5%. The impurity content is too high to be directly electrolytic refined. Electrolytic refining requires that the lead anode plate contains Pb≥98.5% (except lead-antimony alloy), Cu≤0.06%, As≤0.4%, and Sb is controlled at 0.4%~0.8%. The purpose of pyro-refining is to remove some impurities from smelting crude lead, so that it can meet t...

AI Technical Summary

Problems solved by technology

Since the refining pot is a circular container and is equipped with a pot cover and agitator, it is difficult to realize automatic slagging. All refining pots basically use manual slag removal. Unorganized gas emissions, poor working conditions, and heavy environmental pollution; periodic operations, low labor efficiency, 5 to 7 sets of 150t refining pots are required for a production capacity of 100,000 t / a crude lead, which occupies a large area and is difficult to design for plant configuration

Images