Shale brick processing process with low radon exhalation rate

A technology of radon precipitation rate and processing technology is applied in the field of processing technology of shale bricks with low radon precipitation rate.

Inactive Publication Date: 2013-04-03
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

At present, these building material factories mainly consider the building material processing process from the physical and mechanical pr

Method used

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  • Shale brick processing process with low radon exhalation rate

Examples

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Embodiment 1

[0015] A processing technology for shale bricks with a low radon precipitation rate. This process is to crush and mix the main raw materials shale and coal gangue, and then press molding, drying and roasting to make shale bricks. The process flow chart is as follows figure 1 shown. The specific operation method is:

[0016] First, the raw material shale is crushed four times, and the coal gangue is crushed twice, and then the crushed raw materials are stored in different storage warehouses, and are screened by a vibrating screen with an aperture of 2 mm, and those larger than this size are returned to the crushing process. The final stage is crushed and then mixed with a sensor, the ratio is 1:1.

[0017] Secondly, pressurize the mixed material at 80kPa, dry at 80°C, and bake at 1000°C to obtain finished shale bricks.

[0018] The shale bricks prepared by this process are adsorbed by activated carbon boxes, and then measured by a high-purity germanium gamma spectrometer, an...

Embodiment 2

[0020] The process method and steps are the same as those in the examples, except that the negative pressure used in this process is 75kPa, the mixing ratio of shale and coal gangue is 3:2, the drying temperature is 100°C, and the roasting temperature is 1020°C . The shale bricks prepared by this process are adsorbed by activated carbon boxes, and then measured by high-purity germanium gamma spectrometer, and the radon precipitation rate of shale bricks is 2.251±0.18mBq.m -2 .s -1 .

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Abstract

The invention belongs to the technical field of building materials, and discloses a shale brick processing process with a low radon exhalation rate. The process comprises the following steps: smashing and sieving the raw materials, shale brick and gangue and then mixing the obtained product; and pressing, forming, drying and roasting the mixed product to obtain the shale brick. The key point lies in that the shale brick and the gangue are smashed till the particle size is less than 2 mm; the negative pressure is less than 85 kPa during the pressing and forming; the mixing rate of the shale brick and the gangue is 3:2-1:1; the drying temperature is 80 to 100 DEG C; and the roasting temperature is 1,000 to 1,020 DEG C. The process can decrease the radon exhalation rate and the indoor radon concentration from the source and reduce radiation for residents.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a processing technology for shale bricks with low radon precipitation rate. Background technique [0002] The contribution of radon gas in modern high-rise residential buildings from building materials accounts for 60% to 70%. The radon release rate of building materials is a direct factor affecting the concentration of radon gas in residential buildings. Shale bricks are one of the building materials used in most cities in my country, and the main raw materials are shale and coal gangue. At present, these building material factories mainly consider the building material processing process from the physical and mechanical properties of building materials, but do not consider the internal exposure of residents caused by radon radioactivity of building materials. Contents of the invention (1) Purpose of the invention [0003] According to the problems ...

Claims

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Application Information

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IPC IPC(8): C04B30/00
Inventor 刘福东冀东王春红张永贵
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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