Method for preparing mullite from gangue

A coal gangue and mullite technology, which is applied in the field of calcining coal gangue to prepare mullite, can solve the problems of large cost investment and high energy consumption, and achieve the effects of reducing energy consumption, reducing requirements, and reducing costs

Inactive Publication Date: 2007-10-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main disadvantages of the above methods are high energy consumption and large cost input.

Method used

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  • Method for preparing mullite from gangue
  • Method for preparing mullite from gangue
  • Method for preparing mullite from gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get Yidu coal gangue powder (less than 200 mesh) 3.00g, add the sodium fluoride of coal gangue powder quality 15‰, add the lanthanum oxide of coal gangue powder quality 5‰, mix evenly, put into corundum crucible, put The crucible was placed in a silicon-molybdenum rod box-type resistance furnace, the temperature was raised to 1300°C at a rate of 4°C per minute, and the XRD pattern was obtained by calcination at 1300°C for 3 hours. From the X-ray diffraction pattern (Fig. 1) of the sample, it can be seen that the mullite phase is 55-60%, does not contain cristobalite, and the others are amorphous phases.

Embodiment 2

[0025] Get 3.00g of Yidu coal gangue powder (less than 200 mesh), add sodium fluoride with a coal gangue powder quality of 15‰, add lanthanum oxide with a coal gangue powder quality of 3‰, mix evenly, put it in a corundum crucible, and put The crucible was placed in a silicon-molybdenum rod box-type resistance furnace, the temperature was raised to 1300°C at a rate of 4°C per minute, and the XRD pattern was obtained by calcination at 1300°C for 3 hours. From the X-ray diffraction pattern (Fig. 2) of the sample, it can be seen that the mullite phase is 55-60%, does not contain cristobalite, and the others are amorphous phases.

Embodiment 3

[0027] Get 3.00g of Yidu coal gangue powder (less than 200 mesh), add sodium fluoride with a quality of coal gangue powder of 18‰, add lanthanum oxide with a quality of coal gangue powder of 2‰, mix evenly, put it in a corundum crucible, and put The crucible was placed in a silicon-molybdenum rod box-type resistance furnace, the temperature was raised to 1300°C at a rate of 4°C per minute, and the XRD pattern was obtained by calcination at 1300°C for 3 hours. From the X-ray diffraction pattern (Fig. 3) of the sample, it can be seen that the mullite phase is 55-60%, does not contain cristobalite, and the others are amorphous phases.

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Abstract

This invention relates to a method for preparing mullite by calcining coal gangue. The method comprises: (1) mixing coal gangue powder and additive uniformly; (2) heating the mixed raw materials at a rate of 2-10 deg.C/min to 1300 deg.C, and keeping the temperature for 3h to obtain the product. The additive is composite catalyst of NaF and La2O3. The addition amounts of NaF and La2O3 are 1-2 wt. % and 0.1-0.5 wt. % of coal gangue powder, respectively. The method has such advantages as low energy consumption and low cost. The mullite product does not contain quartz phase that is harmful to mullite properties.

Description

technical field [0001] The invention relates to a method for preparing mullite by calcining coal gangue. technical background [0002] As a by-product of the coal production process, coal gangue has become the industrial waste with the largest stockpile and annual production in my country and occupies the most storage space. Mullite is an aluminosilicate mineral with high refractoriness, good thermal shock resistance, chemical corrosion resistance, creep resistance, high load softening temperature, good volume stability, and strong electrical insulation. It is an ideal high-grade refractory material and is widely used in industries such as metallurgy, glass, ceramics, chemistry, electric power, national defense, gas and cement. The preparation of coal gangue into the M45 mullite refractory material currently required in the market can not only solve the environmental pollution caused by coal gangue stacking, but also create more economic bene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 严春杰李予晋
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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