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High calcium fly ash modified sludge, its preparation method and method for preparing perforated brick using modified sludge

A technology of porous bricks and fly ash, which is applied in the field of preparation of sintered porous bricks, high-calcium fly ash modified sludge, and can solve the problems of ineffective utilization of sludge, high calorific value, and low moisture content of sludge, and achieve Good thermal insulation and sound insulation effect, high strength, low investment effect

Inactive Publication Date: 2011-10-19
王传开 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a high-calcium fly ash modified sludge aiming at the defect that sludge cannot be effectively used to make bricks in the prior art. The modified sludge mixes high-calcium fly ash with a high calorific value and mechanical dewatered sludge , can be used in the production of sintered porous bricks. The modified sludge has the characteristics of low moisture content and high calorific value, and is easy to mix with other soils

Method used

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  • High calcium fly ash modified sludge, its preparation method and method for preparing perforated brick using modified sludge

Examples

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Effect test

Embodiment 1

[0023] The selected high-calcium fly ash comes from a power plant in Jiaxing, with a calcium oxide content of 44.25% and a calorific value of 1950 cal / g. The sludge is dewatered sludge produced during the papermaking wastewater treatment process, which comes from a paper mill in Pinghu, Jiaxing City, with a moisture content of 83.5%. The soil is common brick clay.

[0024] Weigh 5000kg of papermaking sludge, and then weigh 750kg of high-calcium fly ash (high-calcium fly ash accounts for 15 wt %). Mix the two with a small excavator for 30 minutes, put the mixed sludge on the concrete poured ground, and stack it into a steamed bun shape. In order to prevent the soil mound from collapsing, the surrounding bricks are maintained, and the height of the bricks is 25-30cm. The temperature for stacking is 15-25°C.

[0025] The moisture content of the stacked mixed sludge was measured every 24 hours. After 72 hours, the water content has dropped to 46%, and the sludge modification h...

Embodiment 2

[0028] The selected high-calcium fly ash comes from a power plant in Jiaxing, with a calcium oxide content of 44.25% and a calorific value of 1950 cal / g. The sludge is the dewatered sludge produced during the printing and dyeing wastewater treatment process, which comes from a printing and dyeing factory in Jiashan, Jiaxing City, with a moisture content of 85%. The soil is common brick clay.

[0029] Weigh 5000kg of printing and dyeing sludge, and then weigh 1000kg of high-calcium fly ash (high-calcium fly ash accounts for 20 wt %). The two were stirred for 40 minutes with a mini-excavator. Put the mixed sludge on the concrete poured ground and stack it in the shape of steamed buns. In order to prevent the soil mound from collapsing, the surrounding bricks are maintained, and the height of the bricks is 25-30cm. The temperature for stacking is 14-25°C.

[0030] The moisture content of the stacked mixed sludge was measured every 24 hours. After 96 hours, the water content ...

Embodiment 3

[0033]The selected high-calcium fly ash comes from a power plant in Shanghai, with a calcium oxide content of 43.15% and a calorific value of 2147 cal / g. The sludge is dewatered sludge produced by an urban sewage plant, which comes from an urban sewage plant in Tongxiang, Jiaxing City, with a moisture content of 88%. The soil is common brick clay.

[0034] Weigh 5000kg of municipal sludge, and then weigh 1500kg of high-calcium fly ash (high-calcium fly ash accounts for 30 wt %). The two were stirred for 45 minutes with a mini-excavator. Put the mixed sludge on the concrete poured ground and stack it in the shape of steamed buns. In order to prevent the soil mound from collapsing, the surrounding bricks are maintained, and the height of the bricks is 25-30cm. The temperature for stacking is 14-25°C.

[0035] The moisture content of the stacked mixed sludge was measured every 24 hours. After 144 hours, the water content has dropped to 48%, and the sludge modification has be...

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Abstract

The invention, belonging to the technical field of construction material, environmental protection and resource exploitation, relates to a high calcium fly ash modified sludge, its preparation method, and a method for preparing a perforated brick using the modified sludge. The high calcium fly ash modified sludge is prepared by mixing general waste dewatered sludge with high calcium fly ash, wherein, the high calcium fly ash accounts for 15-30 wt%. The preparation method of the high calcium fly ash modified sludge comprises the following steps: preparing materials, selecting the high calcium fly ash with more than 40% of calcium oxide and the calorific value of more than 1800 calorie / gram and the general solid waste dewatered sludge; mixing the high calcium fly ash and the general solid waste dewatered sludge uniformly according to the water content of the sludge; stacking the uniformly mixed sludge mixture in the principle of minimizing the outer superficial area. The method for preparing a perforated brick by using the high calcium fly ash modified sludge provided by the invention is operated at normal temperature, with the advantages of simple operation, small investment and low operation cost, meeting the conception of circular economy, and is a idealist method for sludge recycling..

Description

technical field [0001] The invention belongs to the technical field of building materials and environmental protection resource utilization, and relates to a high-calcium fly ash modified sludge, a preparation method and a method for preparing sintered porous bricks by using the same. Background technique [0002] How to dispose of the sludge generated in the process of sewage treatment has always been one of the important research topics for environmental protection workers. As general solid waste sludge, it contains a large amount of calorific value, germs and a small amount of heavy metals. This type of sludge is produced during the treatment of domestic and industrial wastewater such as urban sewage, printing and dyeing wastewater, and papermaking wastewater. If the sludge is not disposed of properly, the pollutants originally separated from the sewage will return to the environment in various forms, causing secondary pollution, and the investment in the construction and...

Claims

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Application Information

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IPC IPC(8): C04B18/30
CPCY02W30/91
Inventor 王传开杨万东
Owner 王传开
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