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Method for making baking-free bricks by using dye waste water coagulated sludge and baking-free bricks

A technology of dye wastewater and unburned bricks, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of difficulty in flue gas purification, lack of mature and reliable building materials, etc., and achieve resource reduction Reduce costs, improve economic benefits, and consume a large amount of effect

Inactive Publication Date: 2011-01-12
ZHEJIANG DIBANG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, if the sludge is incinerated first, the sludge needs to be dried, the energy consumption is high, and the flue gas purification is difficult.
According to the existing literature reports, Portland cement, ordinary Portland cement, and slag cement cementitious materials are used to directly solidify sludge. When the sludge content exceeds 30%, the compressive strength is less than 10MPa and cannot be used as a building material.
[0009] In short, the resource utilization of a large amount of toxic and harmful dye wastewater coagulation sludge is directly related to the sustainable development of the dye chemical industry, but there is currently a lack of mature, reliable and economically feasible technologies to achieve the stability of dye wastewater coagulation sludge safe, harmless and resourceful

Method used

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  • Method for making baking-free bricks by using dye waste water coagulated sludge and baking-free bricks
  • Method for making baking-free bricks by using dye waste water coagulated sludge and baking-free bricks
  • Method for making baking-free bricks by using dye waste water coagulated sludge and baking-free bricks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Select 2000g of dye wastewater, add 16g of lime to neutralize to pH=4~5, then add 6g of polyferric sulfate, and obtain dye wastewater with a water content of 60% (weight percentage) through operations such as coagulation, precipitation, concentration, and pressure filtration Coagulated sludge, in which the organic matter content is 7.5%, the total amount of sulfate is 27.99%, mainly gypsum, and other sulfates, such as sodium sulfate, magnesium sulfate, iron sulfate, aluminum sulfate of different crystal water, the content is very small, these substances It will not have a great impact on the hydration of cement and the durability of concrete products. Its main dry-based chemical components are shown in Table 1.

[0041] Table 1 The main dry basis chemical components in the dye wastewater coagulation sludge of Example 1

[0042] Element

[0043] Weigh 1000g of the above-mentioned dye coagulation sludge with a water content of 60% and add it to the cement mortar...

Embodiment 2

[0045] According to the preparation method similar to Example 1, select 1000g of dye wastewater, add 10g of calcium carbide slag to neutralize to pH=7~8, then add 4g of polyferric sulfate, and prepare the water content through coagulation, precipitation, concentration, pressure filtration and other operations. It is 50% (weight percent) dye wastewater coagulation sludge, organic matter content is 10.5%, total sulfate is 23.99%, and its main dry basis chemical composition is shown in Table 2.

[0046] Table 2 The main dry basis chemical components in the dye wastewater coagulation sludge of Example 2

[0047] Element

[0048] Take by weighing 800g of the above-mentioned dye coagulation sludge with a water content of 50%, join in the cement mortar mixer, add toner 5g, add 650g of sulfate-resistant characteristic cement (the ratio of dye wastewater coagulation sludge to cement weight 1 : 0.8), after stirring evenly, pour into the mold and vibrate, let it stand in the ai...

Embodiment 3

[0050] According to the similar preparation method of Example 1, the dye wastewater coagulation sludge with a water content of 40% (percentage by weight) is prepared, wherein calcium carbide slag is added to adjust to pH=10~11, the organic matter content is 6.5%, and the total amount of sulfate is 33.33%, and its main dry basis chemical composition is shown in Table 3.

[0051] Table 3 The main dry basis chemical components in the dye wastewater coagulation sludge of Example 3

[0052] Element

[0053] Take by weighing 700g of the above-mentioned dye coagulation sludge with a water content of 40%, add 100g of water, join in the cement mortar mixer, add toner 10g, add 700g of special Portland cement (dye wastewater coagulation sewage) without gypsum The weight ratio of mud to cement is 1:1), after stirring evenly, pour it into the model and vibrate it, and let it stand in the air for 24 hours to release the mold; it is cured in water at room temperature for 5 days, an...

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Abstract

The invention discloses a method for making baking-free bricks by using dye waste water coagulated sludge, which comprises the following steps of: uniformly blending cement and the dye waste water coagulated sludge of which the moisture content is 40 to 60 weight percent, molding and maintaining to obtain the baking-free bricks, wherein the raw material comprises the following components in percentage by weight: 20 to 60 percent of cement, 40 to 80 percent of dye waste water coagulated sludge and the balance of water. The baking-free bricks prepared by the preparation method have the advantages of avoiding secondary pollution, along with high compression strength, high durability and high water permeability speed. The method has the advantages that: a production process is simple; less equipment is needed; investment is small; industrial production and production operation are easily carried out; a large amount of dye waste water coagulated sludge can be consumed; considerable environmental benefit and economical benefit are generated; and conditions for sustainable development of dye chemical industry are created.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste in the dye chemical industry, in particular to a method for preparing non-burning bricks by using coagulation sludge of dye wastewater and the prepared non-burning bricks. Background technique [0002] In recent years, my country's dye production and export volume have grown rapidly. There are more than 1,400 dye varieties, and 700-800 commonly used varieties, of which disperse dyes, reactive dyes and acid dyes are the main products. With the rapid development of my country's dye industry, a large amount of dye wastewater has been produced, which has brought enormous pressure to environmental protection. The so-called dye wastewater refers to the wastewater discharged from the process of manufacturing dyes using benzene, toluene, naphthalene and other raw materials after nitration, iodization, and then diazotization, coupling, and sulfuration reactions. It is mainly pro...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B18/30
CPCY02W30/91
Inventor 陈泉源徐万福谢学报薛罡傅伟松黄璐陈华祥
Owner ZHEJIANG DIBANG CHEM
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