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A process for producing machine-made sand and coal powder from coal gangue

A process method and coal gangue technology, which is applied in the field of producing machine-made sand and coal powder by using coal gangue, can solve the problems of low calorific value, many environmental protection problems, and small scale.

Active Publication Date: 2021-04-23
湖南广义节能装备有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, coal gangue power generation has been banned by the state due to its low calorific value, small scale, and many environmental protection problems. However, coal gangue building materials cannot be used on a large scale due to the characteristics of coal gangue's easy weathering. Coal gangue has been used in coal-producing areas in the early stage. The building built by the brick factory has been weathered and has become a dangerous building that needs to be reinforced or even rebuilt

Method used

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  • A process for producing machine-made sand and coal powder from coal gangue

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Experimental program
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Embodiment 1

[0031] Step 1: Crushing, the vibrating feeder sends the large pieces of coal gangue from the coal gangue stockyard to the crusher for crushing. After crushing, the particle size is 20~100mm; after crushing, it is sent to the vertical rotary mortar mill;

[0032] Step 2: Grinding. The vertical rotary mortar mill will squeeze the material into the material layer to dissociate the soft and hard substances of the coal gangue and grind the material to the designed particle size range, and then the material is transported to the vibrating screen;

[0033] Step 3: Screening. The vibrating screen is provided with three layers of sieve plates with different apertures, which are respectively the largest aperture sieve plate with an aperture size of 4 mesh, the medium aperture sieve plate with an aperture size of 8 mesh, and the small aperture sieve plate with an aperture size of 16 mesh; The product on the sieve plate with aperture is returned to the rotary mill for re-grinding, the pro...

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Abstract

The invention discloses a process for producing machine-made sand and coal powder from coal gangue, including six steps of crushing, grinding, screening, powder selection and dust collection; the invention uses rotary mortar mill + vibrating screen + selection The powder machine replaces the sand making machine + vibrating screen + sand washing machine in the process route, replaces wet sand making with dry sand making, and replaces impact crushing with material layer rolling and crushing, so as to fully dissociate the soft and hard substances in coal gangue and use them separately ; At the same time, the efficient use of coal gangue resources not only solves the weathering problem of coal gangue-made building materials, but also makes the entire process more energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of coal gangue recovery and utilization, in particular to a process for producing machine-made sand and coal powder from coal gangue. Background technique [0002] Coal is the most important energy source in my country, and its resources are very rich. In 2016, the output exceeded 3.7 billion tons, and the total discharge of coal gangue in the same year reached 750 million tons. It is estimated that the total discharge of coal gangue will be close to 800 million tons in 2020. It is 4.5 billion tons, forming more than 2,600 coal gangue hills, covering an area of ​​13,000 hectares. A large amount of coal gangue has caused enormous environmental pressure to the local area. The pollution of coal gangue to soil, crops, air quality, water bodies, etc. has attracted great attention from the society, and it has also become a problem that the Ministry of Environmental Protection and local governments have to deal wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B02C21/00B07B15/00
CPCB02C21/00B02C2201/06B07B15/00B09B3/00
Inventor 李学军唐敏
Owner 湖南广义节能装备有限公司
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