Method for preparing haydite by sintering sludge at low temperature

A low-temperature sintering and sludge technology, which is applied in the field of building materials, can solve problems such as low environmental pollution, and achieve the effect of high emission reduction effect, emission reduction and good energy saving effect.

Inactive Publication Date: 2015-11-04
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to realize a method for preparing ceramsite by low-temperature sintering of sludge, which solves how to use sludge in a large amount, which can be sintered at low temperature and has less environmental pollution.

Method used

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  • Method for preparing haydite by sintering sludge at low temperature
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  • Method for preparing haydite by sintering sludge at low temperature

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Embodiment 1

[0026] A method for preparing ceramsite by low-temperature sintering of sludge. The raw materials used are: dried sludge, high-alkali calcareous shale, barium slag, aluminum dihydrogen phosphate, and borax. The ratio of each raw material is: dried 40% of sludge, 41% of high alkali calcareous shale, 18% of barium slag, 0.5% of aluminum dihydrogen phosphate, and 0.5% of borax. The preparation process is as follows: various raw materials are pretreated according to requirements, measured separately, mixed evenly according to the proportion, and then pressed and formed in the corresponding ball forming mold by pressure forming method, the forming pressure is 10Mpa, and dried at 100°C after forming. Raise the temperature at a rate of 2°C / min to the preheating temperature of 200°C, keep the temperature in this temperature range for 15 minutes, then raise the temperature to 500°C at a rate of 3°C / min, keep the temperature in this temperature range for 20 minutes, and then set the temp...

Embodiment 2

[0028] A method for preparing ceramsite by low-temperature sintering of sludge. The raw materials used are: dried sludge, high-alkali calcareous shale, barium slag, aluminum dihydrogen phosphate, and borax. The ratio of each raw material is: dried Sludge 42%, high alkali calcareous shale 40%, barium slag 16.7%, aluminum dihydrogen phosphate 0.8%, borax 1%. The preparation process is as follows: various raw materials are pretreated according to requirements, measured separately, mixed evenly according to the proportion, and then pressed and formed in the corresponding ball forming mold by pressure forming method, the forming pressure is 12Mpa, and dried at 80°C after forming. Raise the temperature at a speed of 3°C / min to the preheating temperature of 200°C, keep the temperature in this temperature range for 20 minutes, then raise the temperature to 550°C at a speed of 5°C / min, keep the temperature in this temperature range for 15 minutes, and then set the temperature at 6°C / m...

Embodiment 3

[0030] A method for preparing ceramsite by low-temperature sintering of sludge. The raw materials used are: dried sludge, high-alkali calcareous shale, barium slag, aluminum dihydrogen phosphate, and borax. The ratio of each raw material is: dried 40% of sludge, 45% of high-alkali calcareous shale, 13.2% of barium slag, 0.8% of aluminum dihydrogen phosphate, and 1% of borax. The preparation process is as follows: various raw materials are pretreated according to the requirements, measured separately, mixed evenly according to the proportion, and then pressed and formed in the corresponding ball forming mold by the pressure forming method, the forming pressure is 12Mpa, and dried at 90°C after forming. Raise the temperature at a speed of 3°C / min to the preheating temperature of 200°C, keep the temperature in this temperature range for 15 minutes, then raise the temperature to 550°C at a speed of 5°C / min, keep the temperature in this temperature range for 15 minutes, and then set...

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Abstract

The invention belongs to the types of building materials, and provides a method for preparing haydite by sintering sludge at low temperature. The method comprises the following steps of: 1) taking the following components in percentage by weight: 40%-45% of dewatered sludge, 40%-45% of high-alkali calcareous shale, 12%-18% of barium residues, 0.5%-0.8% of aluminum dihydrogen phosphate and 0.5%-1% of borax; and 2) uniformly mixing all the taken components so as to obtain a mixture, pressing and molding the mixture in balling molds by a static pressure molding method so as to obtain haydite, wherein the molding pressure is 8Mpa-12Mpa, after the haydite is molded, drying the molded haydite under the environment of 60-100 DEG C, preheating the dried haydite, raising temperature, sintering the preheated haydite, and slowly reducing temperature so as to obtain finished products. The method disclosed by the invention has the advantages of having a better solid waste utilization effect, having a good energy saving effect, and having a higher emission reduction effect; in conclusion, favorable economic effects are realized.

Description

technical field [0001] The invention belongs to building materials and provides a method for preparing ceramsite by low-temperature sintering of sludge. Background technique [0002] In recent years, with the vigorous development of my country's economic construction and society, it has driven the vigorous development of my country's construction industry, but in the process of rapid development, many problems have gradually been exposed: such as the large resource consumption of my country's construction industry, resource recycling The utilization rate is low, and the proportion of building energy consumption in the total energy consumption of the whole society is gradually increasing, and it is expected to reach more than one-third of the total energy consumption of the whole society by 2020. Facing this series of increasingly severe problems, how to reduce building energy consumption and realize the development of the construction industry in the direction of green and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/138C04B33/13C04B33/18C04B33/32
CPCY02P40/60
Inventor 蹇守卫何桂海孙孟琪马保国郅真真张吕东
Owner WUHAN UNIV OF TECH
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