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Method for comprehensively recovering lead, zinc and iron in gas ash of blast furnace

A technology of blast furnace gas ash and blast furnace mud, which is applied in the field of comprehensive utilization of iron and steel smelting solid waste, can solve problems such as obstacles, large amount of accelerator usage, and unsatisfactory effects, and achieve improved roasting efficiency, wide application range, and increased productivity Effect

Active Publication Date: 2019-12-13
SINOSTEEL MAANSHAN INST OF MINING RES
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  • Abstract
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Problems solved by technology

But see from existing report, the accelerator effect that uses at present is not satisfactory, mainly shows in: 1. can not promote the high-efficiency volatilization of lead, zinc simultaneously (the promotion effect to lead volatilization is obvious, the promotion effect to zinc volatilization is weaker, even hinder operation); 2. the effect of promoting the volatilization of lead and zinc is not good (the volatilization rate is generally about 80%) under the relatively low temperature; Negative impact; ④A large amount of accelerator is used (about 15%)

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  • Method for comprehensively recovering lead, zinc and iron in gas ash of blast furnace

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Embodiment Construction

[0034] In order to describe the present invention, a method for comprehensively recovering lead, zinc and iron in blast furnace gas ash of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0035] The blast furnace gas ash used in this example is a mixed sample of gas ash collected from 6# blast furnace, 7# blast furnace, 8# blast furnace, 9# blast furnace and 10# blast furnace of Xinyu Iron and Steel Company. Multi-element analysis and iron phase analysis were carried out on the mixed gas, and the results are shown in Table 1 and Table 2.

[0036] Table 1 Multi-element analysis results of test gas mud samples (%)

[0037] element TF ZnO PbO SiO 2

CaO MgO al 2 o 3

S P C content 22.35 13.34 3.43 6.47 3.10 1.07 2.43 1.39 0.057 26.68 element MnO CuO NiO Cr 2 o 3

TiO 2

Na 2 o

K 2 o

Bi 2 o 3

In 2 o 3

burn...

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Abstract

The invention discloses a method for comprehensively recovering lead, zinc and iron in gas ash of a blast furnace. Anthracites of 20-30% of the total mass of blast furnace gas mud are fed in the blastfurnace gas mud containing lead, zinc and iron, and roasting accelerants of 4.0-6.0% of the total mass of the blast furnace gas mud and compounded by Na2CO3 and CaCO3 are fed; the materials are uniformly mixed and fed in a rotary kiln or a rotary hearth furnace, with a smoke recovery system, for reduction roasting; gas is extracted to feed in the smoke recovery system for treatment; mud settlingproducts containing lead and zinc are collected; roasting ores discharged from the rotary kiln or the rotary hearth furnace are quenched by water; and the water-quenched materials are fed in an ore grinding-weak magnetic separation recovery system to obtain iron concentrate powder. The method can synchronously realize the zinc volatilization rate of above 95% and the lead volatilization rate of above 86%, obtains iron concentrates with the grade of above 65.00%, not only can effectively recover lead, zinc and iron resources in the gas ash, but also can reduce the energy consumption, and improves the productivity.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of iron and steel smelting solid waste, in particular to a method for recovering lead, zinc and iron in blast furnace gas ash through roasting volatilization-magnetic separation. Background technique [0002] Blast furnace gas ash is a metallurgical waste produced during the blast furnace smelting process. In recent years, due to the sharp increase in my country's steel production, the amount of gas ash produced has also increased. According to statistics, the amount of blast furnace gas ash in my country is about 10-25kg / t iron, and the annual pig iron output in my country exceeds 700 million tons, so more than 10 million tons of blast furnace gas ash will be produced in my country every year. These plasters contain a large amount of valuable elements such as iron, zinc, lead, chromium, nickel, etc., and have high utilization value. Therefore, major iron and steel enterprises and related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/02C22B13/02C22B19/00
CPCC22B1/02C22B7/001C22B7/02C22B13/025C22B19/00Y02P10/20
Inventor 葛新锋何晓华丁厚权孙炳泉高春庆侯更合陈洲吴霞
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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