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A comprehensive treatment method of red mud and titanium concentrate

A comprehensive treatment, titanium concentrate technology, applied in the field of metal smelting, can solve the problems of high unit cost, large acid consumption, less research, etc., to improve the rate of ball formation, reduce viscosity, and facilitate growth Effect

Active Publication Date: 2018-08-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the extraction of titanium in red mud, there are few studies in previous literature or patents.
The titanium content in red mud is generally 6% to 9%, which is close to the titanium content in some low-titanium vanadium-titanium sea sand ores, and has a certain recovery value, but valuable metal elements such as titanium exist in red mud The state is complex, it does not exist in the form of a single mineral, and different minerals are wrapped and mixed with each other
In literature reports, acid leaching (wet method) is often used to extract titanium. Due to the unstable leaching rate, large acid consumption and high unit cost, wet treatment has certain difficulties and limitations.

Method used

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  • A comprehensive treatment method of red mud and titanium concentrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see process figure 1 . A method for adding titanium concentrate to co-produce molten iron and titanium slag in red mud, the method comprises mixing titanium concentrate and alumina red mud (TFe 38%, TiO 2 10.64%) were evenly mixed, and then added carbonaceous reducing agent anthracite for mixing and pelletizing, wherein the mass ratio of each component was: red mud: titanium concentrate: reducing agent = 100:24:15.8. The ball forming rate of the pelletizing process is 92%, and the falling strength of the pellets is 6-8 times.

[0030] The pellets made of the above raw materials are dried and roasted at a temperature of 1150-1300°C to obtain metallized pellets; then the metallized pellets are put into a smelting furnace and melted at 1500-1550°C to obtain good separation of slag and iron molten iron and titanium slag. In the obtained titanium slag, TiO2 is 45.3%, the recovery rate of TiO2 is 97.2%, and the recovery rate of iron is 96.23%.

Embodiment 2

[0032] A method for adding titanium concentrate to co-produce molten iron and titanium slag in red mud, the method is to add alumina red mud (TFe40%, TiO 2 9.78%) with 28% titanium concentrate. The mixed material is used as a new raw material, and then carbonaceous reducing agent coke powder is added for mixing and pelletizing. Calculated as a percentage of the raw ore, the proportion of the added reducing agent is about 14.8%. The ball forming rate in the pelletizing process is 95%, and the falling strength of the pellets is 10-12 times.

[0033] Dry the pellets made of the above raw materials for 2 hours, and then put them into a reduction furnace for direct reduction. The reduction temperature range is 1180-1320°C, and the total reduction time is 48 minutes. Then the metallized pellets are placed in a smelting furnace and melted at 1500-1600° C. to obtain molten iron and titanium slag with good separation of slag and iron. In the obtained titanium slag, TiO 2 47.63%, Ti...

Embodiment 3

[0035] A method for adding titanium concentrate to co-produce molten iron and titanium slag in red mud, the method is to add alumina red mud (TFe40%, TiO 2 8.64%) with 35% titanium concentrate. The mixed material is used as a new raw material, and then carbonaceous reducing agent is added for mixing and pelletizing. Calculated as a percentage of raw ore, the proportion of the added reducing agent is about 13.5%. The pelletizing rate in the pelletizing process is 90%, and the pelletizing strength is 5-6 times.

[0036] The pellets made of the above raw materials are dried at 180°C, and then the metallized pellets are put into a smelting furnace and melted at 1500-1650°C to obtain molten iron and titanium slag with good separation of slag and iron. In the obtained titanium slag, TiO 2 48.6%, TiO 2 The recovery rate was 98.1%, and the iron recovery rate was 96.72%.

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Abstract

The invention belongs to the field of metallurgy, and provides a comprehensive treatment method of red mud and titanium concentrate. The method comprises the following steps that firstly, the red mud and the titanium concentrate are mixed, a carbonaceous reducing agent is added for even mixing, and mixture is obtained; secondly, roasting is carried out; and thirdly, an iron product and titanium tailings are obtained through separation. The technical problem that the recovery rate of the titanium element in the red mud with the low titanium content (9%) is low is solved by adding 20-40% of titanium concentrate, and the recovery rate can reach more than 97%. The problems that in an existing red mud titanium extraction technology, the technological process is long, energy consumption is large, and large-scale comprehensive recycling is hard to achieve are solved.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a comprehensive treatment method of red mud and titanium concentrate. Background technique [0002] Red mud is the most important solid waste generated in the production process of alumina industry. At present, the annual discharge of red mud in China exceeds 30 million tons. Except for a small part used in cement production and brick making, most of them are used in wet open-air dam construction Stockpiling, the cumulative stockpiling of red mud has exceeded 100 million tons. The comprehensive utilization of red mud has always been a worldwide problem, and has become a problem that seriously restricts the sustainable development of my country's alumina industry. In recent years, the profit margin of the alumina industry has been declining. At present, many enterprises are in a state of loss. The construction of the red mud storage yard not only occupies a large amount ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/12C22B1/02
Inventor 古明远王敏曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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