Lead reducing slag treating method and device

A processing method and processing device technology, applied in the direction of improving process efficiency, etc., can solve the problems of waste of resources, high zinc and lead content, etc., and achieve the effect of improving the recovery rate

Pending Publication Date: 2021-03-09
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method and device for processing lead reduction slag, so as to solve the problem of high zinc and lead content in the tailing slag and waste of resources in the prior art when fuming furnace is used to process lead reduction slag

Method used

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  • Lead reducing slag treating method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] use figure 1 As shown in the processing device, the CR furnace includes a shell and an electrode. There is a cavity inside the shell, and the electrode passes through the shell and extends into the cavity for heat supply. The volume of the part where the electrode extends into the cavity accounts for the total volume of the cavity. 5.5% of volume. The way of adding the reducing agent is to directly add the reducing agent inlet on the top of the shell, and pass the granular reducing agent into the cavity through the belt conveyor. An air leakage port is arranged above the molten pool on the side of the shell.

[0063] The lead reduction slag is added into the CR furnace in the form of liquid hot slag by the launder, and the lignite particles of 5-30mm are transported to the chamber through the belt conveyor, and the amount added is 6% of the lead reduction slag to increase the temperature of the slag in the furnace To 1460°C, the power density in the cavity is 210kW / m ...

Embodiment 2

[0067] use figure 1 As shown in the processing device, the CR furnace includes a shell and an electrode. There is a cavity inside the shell, and the electrode passes through the shell and extends into the cavity for heat supply. The volume of the part where the electrode extends into the cavity accounts for the total volume of the cavity. 5.5% of volume. The reducing agent is added by wire feeding. There are 15 wire feeding holes with a diameter of 20mm on the top and side of the shell. The carbon powder wire is coke powder wrapped in aluminum skin with a thickness of 0.1mm, and the carbon content is 99wt%. An air leakage port is arranged above the molten pool on the side of the shell.

[0068] The lead reduction slag is added into the CR furnace in the form of liquid hot slag by the launder, and the carbon powder is fed into the chamber to raise the temperature of the slag in the furnace to 1470°C, and the power density in the chamber is 220kW / m 2 , carry out electrothermal...

Embodiment 3

[0072] use figure 1 As shown in the processing device, the CR furnace includes a shell and an electrode. There is a cavity inside the shell, and the electrode passes through the shell and extends into the cavity for heat supply. The volume of the part where the electrode extends into the cavity accounts for the total volume of the cavity. 5.5% of volume. The way of adding the reducing agent is spraying the top and side spray guns of the shell. One spray gun is set on the top and two spray guns are installed on the side, which are used to spray the powdered reducing agent with nitrogen as the carrier. An air spray gun is arranged above the molten pool at the side of the housing for injecting air into the molten pool.

[0073] The lead reduction slag is added into the CR furnace in the form of liquid hot slag using a launder. The powdered reducing agent is coke powder with a particle size higher than 200 mesh powder accounting for ≥ 50 wt%, and the amount added is 5% of the lea...

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Abstract

The invention provides a lead reducing slag treating method and device. The lead reducing slag treating method comprises the following steps that lead reducing slag and a reducing agent are subjectedto an electrothermal reduction reaction in a CR furnace to obtain smoke containing lead and zinc; the CR furnace comprises a shell and an electrode, a cavity is formed in the shell, the electrode penetrates through the shell and extends into the cavity to supply heat, and the volume of the part, extending into the cavity, of the electrode accounts for 1.5%-5.5% of the total volume of the cavity; the cavity provides a place for electrothermal reduction reaction; and lead and zinc in the lead and zinc-containing smoke are recycled to obtain lead and zinc-containing smoke dust. By means of the treating method, the CR furnace is adopted for treating the lead reducing slag, comprehensive and deep recovery of lead and zinc in the lead reducing slag can be achieved, high-grade zinc-lead smoke dust is obtained, and lead and zinc residues in tailings are obviously reduced.

Description

technical field [0001] The invention relates to the field of post-treatment of lead reduction slag, in particular to a method and device for processing lead reduction slag. Background technique [0002] At present, more than 90% of domestic lead smelters adopt the bottom blowing lead smelting process. The slag produced by the smelting furnace is reduced to produce reduced slag and crude lead. The crude lead is sent to fire refining, and the liquid lead reduced slag enters the fuming furnace for treatment and recovery. Metals such as zinc and lead. [0003] In industrial practice, the zinc content in lead reduction slag is 10%-20%, and the lead content is 1%-5%. Due to the limitation of the technology and equipment conditions of the existing fuming furnace treatment of lead reduction slag, the treated slag contains Zinc is generally 1.5% to 2.5%, and the lead content in slag is generally 0.3% to 0.5%. The content of zinc and lead in tailings is high, resulting in waste of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/02C22B19/00
CPCC22B7/04C22B7/001C22B13/025C22B19/00Y02P10/20
Inventor 李东波梁帅表郭亚光黎敏邓兆磊陈学刚吴卫国王云曹珂菲冯双杰
Owner CHINA ENFI ENGINEERING CORPORATION
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