Gangue comprehensive integrated utilization method

A technology for coal gangue and desulfurization gypsum is applied in the application field of coal gangue, which can solve the problems of single utilization route, lack of systematic utilization method of coal gangue, low product added value, etc., and achieves the effect of high added value.

Active Publication Date: 2019-01-04
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the utilization of coal gangue in the above-mentioned prior art is either relatively simple in use, or the added value of the product is relatively low, resulting in the lack of a systematic utilization method for coal gangue. Therefore, it is necessary to research and develop a comprehensive and integrated utilization method for coal gangue , in order to achieve high efficiency and high value-added utilization of coal gangue

Method used

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Experimental program
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Effect test

Embodiment 1

[0071] In step (1), the preparation method of described gelling material comprises the steps:

[0072] 1) First crush the large pieces of coal gangue, then screen out the coal gangue with a particle size greater than 25mm and less than 5mm, and leave the coal gangue with a particle size of 5-25mm for later use;

[0073] 2) Coal gangue with a size greater than 25 mm and a size less than 5 mm that are sieved together with desulfurized gypsum, aluminum ash, and electroslag are ground, mixed evenly, and then calcined to obtain the sulphoaluminate cementitious material.

[0074] The ratio of the coal gangue, desulfurized gypsum, aluminum ash and carbide slag is (mass percentage) 20%:20%:30%:30%.

[0075] In the preparation method of the gelling material, the low-temperature calcination temperature is 1250° C., and the time is 2 hours.

[0076] In step (2), the method for preparing light-weight high-strength ceramsite is as follows: by mass percentage, take 90% of coal gangue with ...

Embodiment 2

[0088] In step (1), the preparation method of described gelling material comprises the steps:

[0089] 1) First crush the large pieces of coal gangue, then screen out the coal gangue with a particle size greater than 25mm and less than 5mm, and leave the coal gangue with a particle size of 5-25mm for later use;

[0090] 2) Coal gangue with a size greater than 25 mm and a size less than 5 mm that are sieved together with desulfurized gypsum, aluminum ash, and electroslag are ground, mixed evenly, and then calcined to obtain the sulphoaluminate cementitious material.

[0091] In the preparation method of the cementitious material, the ratio of coal gangue, desulfurized gypsum, aluminum ash, and carbide slag is (mass percentage): 20%:20%:20%:40%

[0092] In the preparation method of the gelling material, the low-temperature calcination temperature is 1200° C., and the time is 3 hours.

[0093] In step (2), the method for preparing light-weight high-strength ceramsite is as follo...

Embodiment 3

[0105] In step (1), the preparation method of described gelling material comprises the steps:

[0106] 1) First crush the large pieces of coal gangue, then screen out the coal gangue with a particle size greater than 25mm and less than 5mm, and leave the coal gangue with a particle size of 5-25mm for later use;

[0107] 2) Coal gangue with a size greater than 25 mm and a size less than 5 mm that are sieved together with desulfurized gypsum, aluminum ash, and electroslag are ground, mixed evenly, and then calcined to obtain the sulphoaluminate cementitious material.

[0108] In the preparation method of the cementitious material, the proportions of coal gangue, desulfurized gypsum, aluminum ash and carbide slag are (mass percentage): 30%:20%:20%:30%.

[0109] In the preparation method of the gelling material, the low-temperature calcination temperature is 1300° C., and the time is 1 h.

[0110] In step (2), the method for preparing light-weight high-strength ceramsite is as fo...

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Abstract

The invention relates to a gangue comprehensive integrated utilization method and relates to the technical field of gangue application. The method includes the steps of firstly, using gangue, desulfurized gypsum, aluminum ash and electroslag to prepare a sulphoaluminate cementing material; secondly, using gangue and city sludge to prepare light and high-strength ceramsite; thirdly, using the sulphoaluminate cementing material to perform wrapping modification on gangue to prepare gangue ecological aggregate; fourthly, using the sulphoaluminate cementing material and the gangue ecological aggregate as the raw materials to prepare water-permeable concrete; fifthly, using the sulphoaluminate cementing material, the light and high-strength ceramsite and the gangue ecological aggregate as the raw materials to prepare light ecological concrete. The method has the advantages that the gangue is used as the main raw material, the desulfurized gypsum, the aluminum ash, limestone, the city sludgeand the like are used as the auxiliary materials, multilevel crossing and comprehensive utilization of the gangue are achieved, and high-additional-value utilization of the gangue is achieved.

Description

technical field [0001] The invention relates to the technical field of application of coal gangue, in particular to a method for reusing industrial solid waste for preparing multi-level building products by using coal gangue. Background technique [0002] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. Including the excavation gangue during the roadway excavation, the gangue extracted from the roof, floor and interlayer during the mining process, and the gangue picked out during the coal washing process. Its main component is Al 2 o 3 , SiO 2 , also contains varying amounts of Fe 2 o 3 , CaO, MgO, Na 2 O, K 2 O.P 2 o 5 , SO 3 and carbon and trace rare elements (gallium, vanadium, titanium, cobalt). [0003] Coal gangue is the largest industrial waste in China, accounting for about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B18/02C04B28/06C04B38/08C04B20/10
CPCC04B7/32C04B18/027C04B20/1077C04B28/06C04B38/08C04B2111/00284C04B2201/50C04B18/023C04B18/12C04B18/0418C04B38/0074
Inventor 王文龙吴长亮张超刘全勋毛岩鹏蒋稳
Owner SHANDONG UNIV
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