Method for preparing iron from iron-containing slag charge by employing bath smelting and melt restoring

A technology of molten pool smelting and molten pool smelting furnace is applied in the field of metallurgy to achieve the effect of high metal recovery rate and wide applicability

Active Publication Date: 2015-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron-containing slag with low iron content and high sulfur content, there is no report in the prior art to produce qualified pig iron from such slag

Method used

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  • Method for preparing iron from iron-containing slag charge by employing bath smelting and melt restoring
  • Method for preparing iron from iron-containing slag charge by employing bath smelting and melt restoring
  • Method for preparing iron from iron-containing slag charge by employing bath smelting and melt restoring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Taking the zinc leaching slag of a smelter in Hunan as an example, the XRF characterization results of the zinc leaching slag are shown in Table 1.

[0058] Table 1 Chemical composition of galvanizing slag

[0059] the element

Content (wt.%)

the element

Content (wt.%)

O

37.4

Al

0.746

Fe

27.05

Mg

0.281

Zn

16.26

Cu

0.8006

S

8.42

mn

0.549

Si

2.52

K

0.423

Ca

1.42

In

0.027

Pb

1.723

others

2.3804

[0060] The contents of iron and zinc in the galvanizing slag are up to 27.05wt% and 16.26wt%, respectively, which has high recovery value. Its own ternary alkalinity is calculated as 0.455, which belongs to acid slag. According to XRD detection, the main phase composition of zinc leaching slag is zinc ferrite (ZnFe 2 o 4 ), calcium sulfate dihydrate (CaSO 4 *2H 2 O), zinc silicate (Zn 2 SiO 4 ) and jarosite (KFe 3 (...

Embodiment 2

[0067] Taking the blast furnace lead slag of a smelter in Hunan as an example, the XRF characterization results of lead smelting slag are shown in Table 2.

[0068] Table 2 Chemical composition of blast furnace lead smelting slag

[0069] the element

Content (wt.%)

the element

Content (wt.%)

O

28.3

Pb

2.13

Fe

20.49

Al

2.39

Zn

13.18

Mg

1.04

S

1.44

K

0.852

Si

10.20

others

5.678

Ca

14.30

[0070] (1) Desulfurization in a weak oxidizing atmosphere: Dry the zinc leaching slag at 90°C for 30 minutes, grind it to -60 mesh and put it into the resistance furnace. After the furnace temperature reaches 1340°C, keep it warm for 30 minutes;

[0071] (2) Oxygenate melt: Add slagging agent CaO to the desulfurized product, adjust the basicity R=1.6, raise the furnace temperature to 1400°C, keep warm for 30min in an oxygen-enriched atmosphere of 30%...

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Abstract

The invention relates to a method for preparing iron from iron-containing slag charge by employing bath smelting and melt restoring, and belongs to the technical field of metallurgy. The method comprises the following steps: in a bath smelting furnace, heating iron-containing slag charge, in which the mass percent content of iron is lower than 50% and the mass percent content of sulphur is 0.07%-15%, to over 1100 DEG C in a low oxidative atmosphere to obtain a desulfurization product; heating to 1350-1450 DEG C, simultaneously adding a slag-making material and lastingly introducing an oxygen-enriched gas, and stopping introducing of the oxygen-enriched gas until the desulfurization product and slag-making material are completely co-molten; obtaining oxide melt and then adding a reducing agent; and restoring at 1450-1550 DEG C, so as to obtain cast iron of which the mass percent content of sulphur is smaller than or equal to 0.07%. The method is strong in adaptive capacity, and convenient for industrial popularization, and low-iron and high-sulphur slag charge generated in metallurgical and inorganic chemical industries is effectively recovered and utilized.

Description

technical field [0001] The invention relates to a method for iron-making by iron-containing slag molten pool smelting melt reduction, belonging to the technical field of metallurgy. Background technique [0002] The raw materials used in non-ferrous metallurgy and inorganic chemical production at home and abroad do not contain impurities such as iron and silicon, and the process has iron removal steps. Therefore, both non-ferrous metallurgy and inorganic chemical industry produce iron removal slag, which piles up into mountains and causes serious environmental pollution. lead slag etc. These waste slags often contain a variety of valuable metals including iron, which is a good secondary resource. Dealing with various iron-containing waste slag materials and realizing the comprehensive utilization of iron-containing slag materials is a major problem that needs to be solved urgently. [0003] Traditional blast furnace ironmaking has higher requirements for ironmaking materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21B13/00C22B7/02C22B19/30C22B13/00C22B58/00
CPCY02P10/20
Inventor 谭军刘洋刘常青张平民尹周澜陈启元
Owner CENT SOUTH UNIV
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