Process for roasting and restoring tailings with weak-intensity magnetism by dragon kiln

A magnetic tailings, roasting technology, applied in the direction of magnetic separation, high gradient magnetic separator, solid separation, etc., can solve the problems of low tailings recovery rate, complex process, high energy consumption, and improve the tailings recovery rate, technology The effect of low cost and simple operation

Inactive Publication Date: 2010-05-05
马雨田
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Problems solved by technology

[0007] In order to solve the problems of complex process, large investment, high energy consumption and low recovery rate of tailings in the existing iron ore tailings recovery technology in my country, the present invention provides a process for roasting and reducing weak magnetic tailings in a dragon kiln

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  • Process for roasting and restoring tailings with weak-intensity magnetism by dragon kiln
  • Process for roasting and restoring tailings with weak-intensity magnetism by dragon kiln

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Embodiment Construction

[0019] A kind of dragon kiln roasting reduction weak magnetic tailings process, such as figure 1 As shown, the process steps are as follows:

[0020] a. The tailings slurry is pumped into the roller sieve from the pump pool, and the qualified size minerals are separated by the roller sieve, and sent to the high gradient magnetic separator for rough separation to obtain rougher tailings;

[0021] b. Filter the roughing tailings through a filter so that the water content does not exceed 10% of its total weight, and then dry or dry naturally;

[0022] c. Mix and add pulverized coal in the dried or naturally dried roughing tailings in an appropriate proportion to make honeycomb bricks;

[0023] d. Put the honeycomb square bricks into the kiln chamber of the dragon kiln for reduction roasting. There are boring ore bins under each kiln chamber of the dragon kiln, and a manual movable gate is provided between the kiln chamber and the boring ore bin. After the honeycomb bricks are r...

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Abstract

The invention relates to the field of tailings recovering, in particular to a process for roasting and restoring tailings with weak-intensity magnetism by using a dragon kiln, solving the problems of complicated process, great investment, high energy consumption, low tailing recovering ratio and the like existing in the traditional iron tailings recovering technology in China. The process comprises the following steps of: a, separating tailing pulp by a rolling sieve, roughing by a magnetic separator to obtain roughed tailings; b, filtrating and baking/naturally drying the roughed tailings; c, adding coal dust in the roughed tailings according to an appropriate proportion to prepare alveolate shaped quadrels; d, placing the alveolate shaped quadrels into a kiln chamber of the dragon kiln for restoring and roasting, dropping the reduced-restored alveolate shaped quadrels in the kiln chamber in a sealed ore storage bin below, and naturally cooling the alveolate shaped quadrels at an air isolated environment; and e, carting and grinding the cooled alveolate shaped quadrels, sieving by a high-frequency sieve and selecting fined ore powder by the magnetic separator. The process is mature and stable with easy operation and low cost, can increase the tailing recovering ratio by 6-15 percent, is suitable for recycling the tailings, and can be widely popularized with strong adaptability to the tailings.

Description

technical field [0001] The invention relates to the field of recovery of tailings, in particular to a process for roasting and reducing weakly magnetic tailings in a dragon kiln. Background technique [0002] Iron ore is the grain of the iron and steel industry and the material basis for the development of the iron and steel industry. Since the 1990s, China's iron and steel industry has developed rapidly, and the demand for ore has grown rapidly. However, the domestic iron ore production capacity has grown slowly, which is far from meeting the demand, and has to rely on foreign iron ore. China's import of rich iron ore from abroad increased from 10 million tons in 1985 to 150 million tons in 2003, surpassing Japan and becoming the world's largest importer of iron ore, reaching 440 million tons in 2008. Australia, Brazil, India and other iron ore companies have raised prices by increasing prices, and even government tax increases have greatly increased prices. From a strate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B07B1/00B03C1/025B07B1/28B03C1/02
Inventor 马春雨马雨田
Owner 马雨田
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