Smelting process for efficient and energy-saving secondary lead

Abstract

The invention relates to a smelting process for efficient and energy-saving secondary lead. The smelting process comprises the following process steps that after burdening of lead paste which is separated out through automatic disassembly of a waste lead-acid battery and is carbonated and solvent, burdenings are sent into an oxygen-enriched smelting furnace to be subjected to smelting, and crude lead, lead slag and low-concentration SO2 flue gas are produced; and after residual heat recovery and dust collection through a dust collector, the SO2 flue gas is sent to a desulfurization system, is desulfurized and is discharged with standard level, wherein the lead slag, serving as vitrified general wastes, is sold to a cement plant as a raw material; the crude lead is electrolytically refined to obtain refined lead and anode slime, and the refined lead and the anode slime are sold; and a system of realizing the process is composed of an oxygen-enriched side-blown smelting furnace, feeding equipment, slag water quenching equipment, cooling equipment, dust collection equipment and desulfurization equipment. According to the smelting process, with process design and system improvement, elements including Pb, Ag, Cu, Sb and Sn are cleanly and efficiently recovered.

Description

technical field [0001] The invention relates to the technical field of secondary lead smelting, in particular to a high-efficiency and energy-saving secondary lead smelting process. Background technique [0002] At present, there are nearly 300 domestic recycled lead factories, but not many of them have a scale of tens of thousands of tons, and the average production capacity of small factories is about 1,000 tons per year. Domestic secondary lead manufacturers have small production scale and low technical level. Most manufacturers use small reverberatory furnaces for smelting, and some small enterprises and self-employed people even use primitive earthen furnaces and earthen kilns for smelting. The specific smelting method is: mix lead metal and lead slag ash into the kiln for smelting, a large amount of lead metal that can be melted at low temperature and cast lead slag are smelted at high temperature together, bituminous coal is used as fuel in the smelting process, anthr...

AI Technical Summary

Problems solved by technology

[0004] In recent years, China has introduced or independently developed mechanical crushing and sorting waste battery technology and equipment on a large scale, but there is no ideal treatment technology for carbonated lead paste. Among them, the imported short kiln failed due to the difficulty of process stability control. Example: The double-chamber energy-saving circular furnace independently developed in China has limited scale and high cost of single furnace; the side-blown furnace for direct lead smelting requires large investment, high process control requirements, and high energy consumption

Images