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Method and device for extracting iron from melted reduced nickel slag

A technology of nickel slag and melting section, which is applied in the field of resource utilization and waste heat recovery, can solve the problem of unreliable nickel slag, and achieve the effect of simple structure, less equipment investment and zero emission

Inactive Publication Date: 2010-05-26
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The smelting reduction method was proposed in the 1920s. Domestic Baosteel, Shougang, Laiwu Steel and Huaiwu Steel have all introduced and researched the smelting reduction technology, but there is no reliable method for nickel slag to be used in industrial production.

Method used

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  • Method and device for extracting iron from melted reduced nickel slag
  • Method and device for extracting iron from melted reduced nickel slag
  • Method and device for extracting iron from melted reduced nickel slag

Examples

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Effect test

Embodiment 1

[0024] A method for extracting iron from smelting reduced nickel slag. The hot nickel slag and a small amount of cold slag are placed in an electric furnace and energized to raise the temperature. When the temperature reaches 1500-1550°C, a slagging agent, a reducing agent and other auxiliary materials are added. The stirring effect of the spray gun makes the reducing agent react with FeO in the slag to generate metallic iron and carbon monoxide. This method simultaneously completes two processes of nickel slag melting and reduction on an electric furnace, heats in the electric furnace, melts to a molten state, flows from the melting section into the reduction section, forms a certain molten pool in the reduction section, and gradually sprays coal powder into the nickel slag. The iron in the slag is reduced, and at the same time, lime and other auxiliary materials are added for slagging, that is, the iron in the nickel slag is reduced.

[0025] After a period of reduction reac...

Embodiment 2

[0031] For each ton of nickel slag raw material, the proportions by weight of coal powder, lime powder, and other auxiliary materials are as follows: coal powder 0.3t, lime powder 0.7t, bauxite 0.24t, iron sheet 0.005t, scrap steel 0.085t, fluorite 0.88 t. All the other techniques and contents are the same as in Example 1.

Embodiment 3

[0033] For each ton of nickel slag raw material, the proportions by weight of coal powder, lime powder, and other auxiliary materials are as follows: coal powder 0.15t, lime powder 0.56t, bauxite 0.1t, iron sheet 0.002t, scrap steel 0.06t, fluorite 0.6 t. All the other techniques and contents are the same as in Example 1.

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Abstract

The invention relates to the technical field of resource utilization and waste heat recovery thereof, in particular to a method and a device for extracting iron from waste slag, which are applied in the industry of iron-steel, nonferrous metallurgy and the like. The method simultaneously completes two processes of melting and reducing nickel slag on one electric furnace, and comprises: putting hot-state nickel slag and a small amount of cold-state nickel slag into the electric furnace; feeding material gradually; heating the material to between 1,500 and 1,550 DEG C in the electric furnace to melt the material to a melted state and form a certain molten pool; and gradually spraying pulverized coal to reduce iron in the nickel slag and adding lime and other auxiliary material slagging at the same time so as to realize the process of reducing the iron in the nickel slag. The method fully utilizes sensible heat during the discharge of hot slag and realizes two processes of melting and reducing in one device through re-heating temperature rise, thereby having the advantages of simple process, low cost and capability of effectively utilizing waste resources to recycle iron.

Description

technical field [0001] The invention relates to the technical field of resource utilization and waste heat recovery, and relates to a method and device for iron extraction from waste slag, which are applied in iron and steel, non-ferrous metallurgy and other industries. Background technique [0002] Nickel slag is the waste produced in the process of nickel smelting. The annual discharge of this industry in my country reaches tens of thousands of tons. The iron content in the slag is about 40%, the discharge temperature is about 1200°C, and a small amount of alloying elements (Ni, Cu, Co, etc.) are attached. In recent years, the country has vigorously advocated "energy saving and emission reduction", and optimizing the application of resources is exactly in line with this major development direction, exploring and researching how to use such slag resources. Iron oxide reduction is carried out in a high-temperature molten state, and nickel slag in a molten state is used as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/12C21B11/10
Inventor 高惠民谢国威
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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