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Method for firing shale ceramisite

A technology of shale ceramsite and shale powder, which is applied in the production of clay products, ceramic materials, other household appliances, etc., can solve the problems of secondary environmental pollution, polluted soil and crops, deterioration of water quality, etc., and achieves excellent performance, Energy saving effect

Inactive Publication Date: 2013-04-17
SHAANXI XUANHETONG TECH DEV
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Problems solved by technology

[0004] The treatment of urban sludge is a serious and urgent problem facing the world. The harm of sludge to the environment mainly includes deteriorating water quality, polluting soil and crops, among which heavy metals are a major cause of pollution. Traditional technology The method is to landfill and incinerate the sludge, which will cause secondary pollution to the environment

Method used

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Embodiment 1

[0011] Sewage treatment plants, place the sludge in a constant temperature oven at 105±5°C to dry, take it out after natural cooling, crush and sieve it for use, the average particle size of the sludge after crushing is 180 μm, and the bulk density is 1.14 kg / m 3 , The contents of heavy metal elements in the sludge (unit: mg / kg dry sludge) are: Hg O.07, Cd 2.6, Cu 227, Pb 152, Cr 122, Zn 854, As 6.8. Shale powder has a plasticity index of 130, a moisture content of 7%, and an average particle size of 144 μm.

[0012] The sludge and shale powder were fully mixed and stirred evenly at a mass ratio of 1:1 to make small balls with a diameter of 10 mm. After drying the prepared balls in a drying oven for 2 h, they were taken out and passed through Preheating, roasting, and cooling to obtain ceramsite. The firing system: preheating temperature 500 °C, preheating time 15 min, firing temperature 1 150 °C, roasting time 15 min.

[0013] The coefficient of thermal expansion and water ...

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Abstract

The invention relates to a manufacturing method for porous ceramic products. According to the method for firing shale ceramisite, sludge serves as a raw material. After the sludge is roasted at high temperature, the heavy metal of the sludge and the mineral of the shale form a solution body, so that the solution body is fixed in grids of aluminosilicate. The surface of the shale ceramisite is in a compact glazing state, so the heavy metal component of the sludge can be effectively wrapped and solidified. By the manufacturing method, the urban sludge serves as part of raw materials for firing the shale ceramisite, so the firing expansion temperature of the shale ceramisite can be reduced to be above 100 DEG C, the fired ceramisite has excellent performance, the energy sources are saved, and the urban sludge can be subjected to resource utilization on a large scale.

Description

technical field [0001] The invention relates to a manufacturing method of a porous ceramic product. Background technique [0002] Ceramsite is a kind of aggregate with light weight and certain strength, which is mainly fired at high temperature. At high temperature, due to the melting of clay minerals, vitrified minerals with plasticity and certain viscosity are formed. At the same time, some components in the ceramsite will generate a certain amount of gas. If this part of the gas can be contained in the ceramsite, it can produce relatively large expansion. The temperature After being lowered, a thin layer of dense glazed hard shell is formed on the outside of the ceramsite, so the ceramsite is a spherical particle with light weight and high strength. [0003] Although shale ceramsite uses shale and does not occupy arable land, and can even be recultivated after shale mining, the production process of shale ceramsite is more complicated than that of clay ceramsite and fly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/22C04B33/132
CPCY02P40/60
Inventor 周莉英
Owner SHAANXI XUANHETONG TECH DEV
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