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Method for preparing sludge and mud sintered brick

A technology of sintered bricks and sludge, applied in the field of building materials, can solve the problems of high energy consumption in raw material preparation, low brick dehydration efficiency, complex and diverse ingredients, etc., to avoid large drying sensitivity coefficient, significant filter aid dehydration effect, and accelerated dehydration efficiency effect

Inactive Publication Date: 2017-07-11
JIANGSU ZHONGYI ECOLOGICAL SOIL INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a sludge and silt fired brick and its preparation method, which solves the problem of low dehydration efficiency of brick making in the prior art, high energy consumption for raw material preparation, complex and diverse ingredients, high requirements for molds, low yield of fired bricks, and low quality , high-cost technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Raw material preparation: 3% of modified sludge, 29% of waste red brick chips, 22% of feldspar tailings, 6% of quartz tailings, 40% of sludge mixed, plus 0.05% of polyaluminum chloride and 180ppm of polyacrylamide, through the board Frame filter press mechanically dehydrated to the mixture mud cake with a moisture content of 52%;

[0044] Ingredients: Raw material dry base ingredient ratio, dry sludge powder 62%, mixed mud cake 38%;

[0045] Stirring and aging: Stir the mixture and age it for 7 days; the moisture content of the billet is 29%;

[0046] Blank making and drying: add the aged mixture into the mold to make bricks, and dry them naturally and in a drying room;

[0047]Firing: The dried product is baked in an electric furnace, heated to 950°C, kept for 300 minutes, and cooled to room temperature with the furnace to obtain the finished product.

[0048] Performance test results:

[0049] Compressive strength: 10.1MPa, density: 1123kg m -3 , Water absorption:...

Embodiment 2

[0051] Raw material preparation: 1% of modified sludge, 8% of quartzite tailings, 9% of feldspar tailings, 82% of sludge are metered and mixed, plus 2% of polyaluminium chloride and 550ppm of polyacrylamide, mechanically dehydrated to Mixed mud cake with a moisture content of 58%;

[0052] Ingredients: Raw material dry base ingredient ratio, dry sludge powder 76%, mixed mud cake 24%;

[0053] Stirring and aging: Stir the mixture and age it for 6 days; the moisture content of the billet is 25%;

[0054] Blank making and drying: add the aged mixture into the mold to make bricks, and dry them naturally and in a drying room;

[0055] Firing: The dried product is roasted in an electric furnace, heated to 970°C, kept for 260 minutes, and cooled to room temperature with the furnace to obtain the finished product.

[0056] Performance test results:

[0057] Compressive strength: 12.7MPa, density: 1295kg m -3 , Water absorption: 16.80%, softening coefficient 0.86.

Embodiment 3

[0059] Raw material preparation: 3% modified sludge, 36% quartzite tailings, 61% sludge mixed, plus 1.1% polyaluminum chloride and 290ppm polyacrylamide, mechanically dehydrated by a plate and frame filter press to a water content of 55%. mud cake;

[0060] Ingredients: Raw material dry base ingredient ratio, dry sludge powder 69%, mixed mud cake 31%;

[0061] Stirring and aging: Stir the mixture and age it for 5 days; the moisture content of the billet is 23%;

[0062] Blank making and drying: add the aged mixture into the mold to make bricks, dry naturally and dry in a drying room;

[0063] Firing: The dried product is roasted in an electric furnace, heated to 980°C, kept for 250 minutes, and cooled to room temperature with the furnace to obtain the finished product.

[0064] Performance test results:

[0065] Compressive strength: 11.5MPa, density: 1362kg m -3 , Water absorption: 13.02%, softening coefficient 0.91.

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Abstract

The invention belongs to the technical field of building materials, and discloses a method for preparing a sludge and mud sintered brick, and the method is as follows: adding a dehydrating agent and a filtration aid agent into wet sludge, stirring and dewatering to obtain a mixture mud cake; adding dry river lake mud powder into the mixture mud cake, stirring and aging to obtain a blank forming material; pressing and forming the blank forming material to obtain a to-be-died brick blank; in turn drying the to-be-died brick blank at room temperature and drying in a drying room to obtain a to-be-burnt brick blank; and firing the to-be-burnt brick blank at 950 to 1050 DEG C. The method for preparing the sludge and mud sintered brick achieves the effects of improving finished product yield and quality, reducing energy consumption and realizing recycling of resources.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing sludge and sludge fired bricks. Background technique [0002] Sludge is the product of sewage treatment in urban sewage treatment plants, mainly from primary sedimentation tanks, secondary sedimentation tanks and other process links. The amount of sludge generated per 10,000 cubic meters of sewage after treatment (based on a moisture content of 80%) is generally about 5 to 10 tons. The "Technical Guidelines for Sludge Treatment and Disposal of Urban Sewage Treatment Plants" issued by the Ministry of Housing and Urban-Rural Development in 2011 pointed out that a large amount of sludge generated during urban sewage treatment has not been generally effectively treated and disposed of. These sludges have high water content and high pollution, which is very easy to cause secondary pollution to groundwater, soil, etc., becoming a threat to environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/30C04B33/13
CPCC04B33/1305C04B33/1321C04B33/30C04B2235/444C04B2235/77C04B2235/96Y02P40/60
Inventor 陈亿军薛强张少华王国菲
Owner JIANGSU ZHONGYI ECOLOGICAL SOIL INST
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