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Method for producing ecological architectural material using sludge and gangue

A technology of ecological building and coal gangue, which is applied in the field of using sludge and coal gangue to produce ecological building materials, can solve the problems of serious secondary pollution and environmental impact, and achieve the effects of low production cost, energy saving, and significant economic benefits

Inactive Publication Date: 2006-04-26
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge incineration technology has just started in China. According to foreign experience, the secondary pollution caused by this method is quite serious, and the dioxins and stench in fly ash will have a great impact on the environment.

Method used

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  • Method for producing ecological architectural material using sludge and gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the method for making unburned brick:

[0022] Sludge is directly mixed with calcined or spontaneously combusted coal gangue to make unburned bricks. The specific steps are:

[0023] 1. Dry the dewatered sludge;

[0024] 2. Crushing coal gangue through three stages of coarse, medium and fine, until the content of particles less than 2mm is greater than 85%;

[0025] 3. Put the crushed gangue slag into the calciner and calcinate at a temperature of about 750°C for 8-10 hours to increase its activity (spontaneous combustion of gangue can be avoided);

[0026] 4. Put the coal gangue slag into hydrochloric acid or sulfuric acid acid solution for acid leaching for 4 hours; the leaching solution is filtered, crystallized, and polymerized to produce polyaluminium chloride or polyaluminum sulfate inorganic polymer flocculant; the leached gangue slag and the dried sludge mix. The weight percentage of the sludge is 12%-18%, and the coal gangue slag is 82%-88%. ...

Embodiment 2

[0029] Example 2: Sintered bricks are made by mixing sludge and gangue. The specific steps are: 1.

[0030] 1. Dry the dewatered sludge;

[0031] 2. The coal gangue mined in the coal mine is crushed and screened with a 2mm vibrating screen;

[0032] 3. Mixing the sieved coal gangue powder with dry sludge, the weight percentage of sludge is 15%-20%, and the weight percentage of coal gangue is 80%-85%;

[0033] 4. Add water, high-alumina cement, sodium carbonate and other external additives to the mixture of sludge and coal gangue powder and stir. Add 150kg-180kg of high-alumina cement, 150kg of water, 5kg of sodium carbonate, and 3kg of water reducing agent per ton of the mixture. After being stirred evenly for the second time, the mixture was made and aged for 2 hours;

[0034] 5. After aging, the mixture is placed in a pressure molding machine and pressed to form bricks, with a molding pressure of 5 tons;

[0035] 6. After the green body is dried at 110°C for 12 hours, pu...

Embodiment 3

[0036] Example 3: Mixing sludge and coal gangue to produce ceramsite. The specific steps are:

[0037] 1. Dry the dewatered sludge;

[0038] 2. The coal gangue mined in the coal mine is crushed and screened with a 2mm vibrating screen;

[0039] 3. Mixing the screened coal gangue powder with dry sludge, the weight percentage of sludge is 40%, and the weight percentage of coal gangue is 60%;

[0040] 4. Add high-alumina cement, water, sodium carbonate and other admixtures to the mixture of sludge and coal gangue powder and stir. Add 150-180kg of high-alumina cement, 150kg of water, 5kg of sodium carbonate, and 3kg of water reducer per ton of the mixture. After stirring for the first time, the mixture was made and aged for 2 hours;

[0041] 5. After aging, put the mixture into a disc granulator to make ceramsite body;

[0042] 6. After the ceramsite body is dried at 110°C for 12 hours, it is put into a calciner for calcination. The calcination temperature is about 1200°C, and...

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Abstract

The method of producing ecological friendly building material with sludge and coal gangue as material features the production process including the steps of: crushing coal gangue into grains and mixing crushed coal gangue in 60-88 wt% and sludge in 12-40 wt%; adding cement, water and admixture into the mixture to form the mixed material; aging the mixed material and forming mechanically in a forming machine to obtain product. The present invention has low production cost, scientific production process and no environmental pollution.

Description

technical field [0001] The invention relates to a production method of building materials, in particular to a method for producing ecological building materials by utilizing sludge and coal gangue. Background technique: [0002] With the improvement of people's living standards and the acceleration of urbanization, the output of urban sewage has increased year by year. At present, my country's annual sewage treatment capacity is 113.6×10 8 m 3 / d, the treatment rate is about 36%, and by 2010 this figure will reach 60%, and the key cities will reach 70%. Sludge is a by-product of sewage treatment, and its output is also increasing year by year. The national urban sewage treatment plants produce about 1.8 million tons of dry sludge per year (9 million tons of sludge with 80% water content). It is estimated that in the next five years, dry sludge will be produced every year. 5.4 million tons of mud (27 million tons of 80% water sludge). Due to the influence of "heavy water a...

Claims

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Application Information

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IPC IPC(8): C04B18/04C04B18/30C04B28/04C04B33/132
CPCY02P40/60Y02W30/91
Inventor 李海英孙贵石张贵杰张学军周淑香
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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