Method for firing ceramsite from coal mixed slag and sludge

A cinder and sludge technology, applied in the production of clay products, ceramic products, ceramic materials, etc., can solve the problems of sludge dehydration or long time, difficult granulation, high water content of sludge, etc., to increase the resistance to sulfuric acid Salt erosion performance and impermeability, the effect of reducing the density of ceramsite and reducing environmental pollution

Inactive Publication Date: 2017-09-05
江苏建华新型墙材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dehydration of sludge by the above method takes a long time or consumes a lot of energy, and the water content of the dehydrated sludge is still high, so it is difficult to granulate and shape ceramsite

Method used

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  • Method for firing ceramsite from coal mixed slag and sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Grind and dry clay and cinder into powder, and dehydrate the sludge by flocculant; 2. Weigh 2 parts of clay, 5 parts of sludge and 3 parts of cinder by volume; 3. Mix the three raw materials evenly without adding water 4. Bake in a constant temperature oven at 105±5°C for 2 hours and 50 minutes; 5. Bake in a constant temperature electric oven at 450°C for 20 minutes; 6. Bake in a constant temperature electric oven at 1150°C for 10 minutes to obtain the product of the present invention.

Embodiment 2

[0027] 1. Grind and dry the clay and cinder into powder; the sludge is dehydrated by flocculant, 2. Weigh 2 parts of clay, 3 parts of sludge and 5 parts of cinder by volume; 3. Mix the three raw materials evenly without adding water 4. Bake in a constant temperature oven at 105±5°C for 2 hours and 30 minutes; 5. Bake in a constant temperature electric oven at 400°C for 25 minutes; 6. Bake in a constant temperature electric oven at 1100°C for 13 minutes to obtain the product of the present invention.

Embodiment 3

[0029] 1. Grind and dry the clay and cinder into powder; the sludge is dehydrated by flocculant, 2. Weigh 2.5 parts of clay, 4 parts of sludge and 3.5 parts of cinder by volume; 3. Mix the three raw materials evenly without adding water 4. Bake in a constant temperature oven at 105±5°C for 2 hours; 5. Bake in a constant temperature electric oven at 380°C for 20 minutes; 6. Bake in a constant temperature electric oven at 1060°C for 15 minutes to obtain the product of the present invention.

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Abstract

The invention discloses a method for firing ceramsite from coal mixed slag and sludge. The method comprises the following steps: grinding coal slag and clay, drying for later use, and dewatering sludge; uniformly mixing and stirring the coal slag, the clay and the dewatered sludge according to a certain ratio; weighing the various materials according to the volume, wherein the amount of the coal slag is 20-60%, the amount of the clay is 20-30%, and the amount of the dewatered sludge is 20-50%; preparing spheres with the particle sizes of 0-40mm from the uniformly stirred and mixed materials in the step b; drying the prepared spheres in a thermostat at the temperature of 105+/-5 DEG C; preheating the spheres dried in the thermostat in a preheating tank at the temperature of 350-500 DEG C for 10-30 minutes; and finally, roasting the spheres in the preheating tank in a roasting box at the temperature of 1050-1150 DEG C for 5-15 minutes, and cooling, thereby obtaining the lightweight ceramsite. The ceramsite fired by the method disclosed by the invention is controllable in operation and high in reproduction ratio; and moreover, more than 70% of solid wastes serve as raw materials, so that the resources are saved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a method for firing ceramsite by mixing coal slag and sludge. Background technique [0002] Ceramsite is a light coarse aggregate with a particle size of 5mm or more, which is made of clay and loam as the main raw materials, processed, granulated, and swollen. It is suitable for heat preservation and can also be used for structural lightweight aggregate concrete. In the ceramsite industry, the ceramsite with a density of 300-500kg / m3 is called ultra-light ceramsite, and the ceramsite with a density > 500kg / m3 is a general-density ceramsite. Ultra-light ceramsite has strict requirements on the raw material formula, so it is generally only partially replaced by solid waste for clay or shale, or solid waste is added to non-solid waste materials such as coal and water glass to prepare ultra-light ceramsite. [0003] Traditional ceramsite raw materials are mainly natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/135C04B38/00C04B18/02
CPCC04B18/027C04B33/1321C04B33/1355C04B38/009C04B2235/656C04B2235/96C04B33/132C04B18/023C04B18/0427C04B18/10C04B14/102Y02P40/60
Inventor 孙怀东
Owner 江苏建华新型墙材有限公司
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