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Titanium slag smelting method

A technology of titanium slag and titanium concentrate, applied in the field of titanium metallurgy, can solve the problems of failure to recycle waste heat of flue gas, low production efficiency, and scarring of reactors

Active Publication Date: 2012-04-04
PANGANG GROUP RESEARCH INSTITUTE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction temperature that these equipment can achieve is low (the highest is only about 1000°C-1200°C), the reduction time takes 4-6 hours, the metallization rate is only 45%-60%, and the reactor is prone to scarring during the reduction process and other phenomena
The whole process takes a long time to restore, the production efficiency is low, the metallization rate is low, and the technical and economic indicators are backward, so it has not been effectively industrialized.
[0010] In recent years, the direct reduction process of the rotary hearth furnace has been developed rapidly, which has the advantages of high reduction temperature and fast reduction speed, but the waste heat of the flue gas in this process has not been recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] The mixture of titanium concentrate, binder and carbonaceous reducing agent in a weight ratio of 100:3.5:18 is mixed and milled into pellets, wherein the titanium concentrate contains 54.13% TiO by weight 2 , 1.47% SiO 2 , 23.16% Fe 2 o 3 , 0.972% Al 2 o 3 , 0.184% MgO, 0.127% CaO, 15.22% FeO, 2.51% MnO and unavoidable impurities, the binder is a mixture of asphalt, starch and pulp with a weight ratio of 2:1:0.5, carbonaceous reduction The agent is anthracite with a fixed carbon content of 72.74%. Then, the flue gas generated by the pre-reduction of the pellets was indirectly water-cooled to 200°C and then supplied to the dryer to dry the wet pellets at 200°C for 80 minutes. Then, the dried pellets were pre-reduced in a rotary hearth furnace to obtain metallized pellets, the reduction temperature was controlled at 1330 ° C, and the reduction time was 65 minutes. heat source. Among them, the combustion of electric furnace flue gas mixed with coke oven gas produced...

example 2

[0046] A mixture of ilmenite concentrate, binder and carbonaceous reducing agent in a weight ratio of 100:2:22, wherein the ilmenite concentrate contains 46.80% by weight of TiO 2 , 3.31% SiO 2 , 4.90% Fe 2 o 3 , 1.02% Al 2 o 3 , 5.84% MgO, 0.857% CaO, 36.02% FeO, 0.654% MnO, 0.116% V 2 o 5 And unavoidable impurities, the binder is sodium carboxymethyl cellulose, and the carbonaceous reducing agent is coke powder with a fixed carbon content of 84.63%. Then, the flue gas produced by the pre-reduction of the briquettes is indirectly water-cooled to 250° C. and then supplied to the dryer to dry the wet briquettes at 250° C. for 60 minutes. Then, the dried briquettes were pre-reduced in a rotary hearth furnace to obtain metallized briquettes. The reduction temperature was controlled at 1390°C and the reduction time was 45 minutes. The flue gas produced in this step was used as dry wet briquettes as described above mine heat source. Among them, the combustion of electric fu...

example 3

[0048] The mixture of titanium concentrate, binder and carbonaceous reducing agent in a weight ratio of 100:2.8:13 is mixed and milled into pellets, wherein the titanium concentrate contains 36.73% TiO by weight 2 , 4.02% SiO 2 , 25.10% Fe 2 o 3 , 3.05% Al 2 o 3 , 1.82% of MgO, 0.14% of CaO, 27.79% of FeO, 1.30% of MnO and unavoidable impurities, the binder is a mixture of organic binder and inorganic binder with a weight ratio of 2:1 Binder, the organic binder is composed of various organic compounds containing carboxyl, hydroxyl, humic acid, etc., the inorganic binder is modified bentonite, and the carbonaceous reducing agent is graphite with a fixed carbon content of 92%. Then, the flue gas produced by the pre-reduction of the pellets passes through the turbulent heat exchanger to exchange heat with the cold air, and the cold air is heated to 350°C and then supplied to the dryer to dry the wet pellets at 350°C for 40 minutes. Then, the dried pellets were pre-reduced in...

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Abstract

The invention provides a titanium slag smelting method which comprises the following steps: preparing a mixture of titanium concentrates, a bonding agent and a carbonaceous reducing agent into pellets or briquettes; drying the pellets or briquettes; prereducing the pellets or briquettes by utilizing an annular furnace or a rotary hearth furnace, thereby preparing metallized pellets or metallized briquettes; and loading the metallized pellets or metallized briquettes into an electric furnace so as to melt and separate the metallized pellets or metallized briquettes, thus obtaining semisteel and titanium slag, wherein the smoke generated by prereducing the pellets or briquettes is used for providing heat for drying the pellets or briquettes, and the smoke generated in the melting and separating process is used for providing heat for prereducing the pellets or briquettes.

Description

technical field [0001] The invention relates to the field of titanium metallurgy, in particular to a method for smelting titanium slag. Background technique [0002] Titanium slag is a kind of titanium-rich material, which can be divided into acid-soluble slag and chloride slag according to its different uses. Acid-soluble slag is suitable for the raw material of titanium dioxide produced by sulfuric acid process, and chloride slag is suitable for the production of titanium by chlorination process. Raw material of white and sponge titanium. Compared with artificial rutile and natural rutile, two titanium-rich materials, the production process of titanium slag is simple, the equipment is easy to be large-scale, the by-product pig iron can be recycled and processed, and the "three wastes" are less and easy to treat (for example, using titanium slag to produce titanium dioxide can reduce Acid consumption and no by-product ferrous sulfate). With the increasingly stringent requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 赵青娥韩可喜何超张继东张兴勇李开华李良黄家旭陈永明
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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