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Comprehensive recycling method of electric steel making lead and zinc-contained dust

An electric furnace steelmaking and dusting technology, applied in the field of iron and steel smelting, can solve the problems of insufficient separation of lead and zinc elements, low resource utilization rate, etc., and achieve the effects of low price, wide source, and reduced process cost.

Active Publication Date: 2017-12-12
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lead and zinc elements are not fully separated, and the lead-zinc mixture can only be collected and used as rough industrial raw materials. The lead-zinc recovery rate is only about 90%, and the resource utilization rate is very low.

Method used

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  • Comprehensive recycling method of electric steel making lead and zinc-contained dust

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Embodiment Construction

[0021] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] Generally, in the electric furnace steelmaking method of producing stainless steel with iron as raw material, the electric furnace steelmaking dust generated in the smelting process is 1-2wt% of the amount of iron input. Steelmaking dust contains a lot of valuable metals such as lead, zinc, iron, nickel, chromium, etc., and also contains harmful heavy metals such as cadmium, mercury, and chromium.

[0023] The main components of common electric furnace steelmaking dust containing lead and zinc are shown in the following table:

[0024] Element

Zn

Fe

Pb

SiO 2

CaO

Al 2 o 3

Cl

F

Cd

other

Wt%

20-25

20-40

2-5

2-10

2-10

1-5

2-7

0.2-0.5

0.02-0.1

Bal.

[0025] like figure 1 Shown, the comprehensive recycling method of electric furnace s...

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Abstract

The invention provides a comprehensive recycling method of electric steel making lead and zinc-contained dust. The comprehensive recycling method comprises the following steps: lead and zinc-contained dust is prepared as pellets for reduction roasting at high temperature; lead and zinc are reduced as simple substances for volatilization in a gas-state form; iron-contained materials are formed to molten blocks, and are separated from lead and zinc; lead and zinc-contained gas and dust are collected, and are oxidized and cooled to obtain rough oxidized lead powder and rough oxidized zinc powder; the iron-contained materials without lead and zinc are collected for quick cooling, crushing and magnetic separation to obtain iron raw materials; the rough oxidized lead powder and the rough oxidized zinc powder are put in a rotary kiln again for high-temperature sintering, and are oxidized and cooled to obtain high-purity finish oxidized lead powder and finish oxidized zinc powder; the finish oxidized lead powder and the finish oxidized zinc powder are firstly reacted with hydrochloric acid to obtain lead chloride and zinc chloride; and lead chloride and zinc chloride are reacted with sodium carbonate to finally obtain lead carbonate and zinc carbonate. The comprehensive recycling method is simple in process, high in lead and zinc recovery rate and high overall resource recycling rate.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a comprehensive recycling method for electric furnace steelmaking dust containing lead and zinc. Background technique [0002] Electric furnace steelmaking dust is a powder in the form of tiny particles collected during the cooling process of dust and tail gas generated in the electric furnace during the smelting process with steel as the main raw material. There are relatively high iron content and lead and zinc content in electric furnace steelmaking dust containing lead and zinc. Generally, the content of lead is 1-7%, the content of zinc is 15-35%, the content of iron is 10-40%, and other harmful metals Such as cadmium, mercury, chromium, etc. Lead and zinc are not good for steelmaking, which limits the recycling of steelmaking dust in the steel process. With the continuous recycling of lead and zinc dust, the content of lead and zinc continues to increase. W...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B1/242C22B1/248C22B19/38C22B19/30C22B13/02
CPCC22B1/2406C22B1/242C22B1/248C22B7/001C22B7/02C22B13/025C22B19/30C22B19/38Y02P10/20
Inventor 栗克建
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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