Method for manufacturing autoclaved bricks by utilizing contaminated acid sludge

A technology of polluted acid slag and autoclaved bricks, which is applied in the field of resource recycling and building materials, can solve problems such as increased pollutant concentration, irregular construction, and the advent of treatment technology, achieving social and economic harmony, simple and practical technology, and The effect of a wide range of raw material sources

Inactive Publication Date: 2012-11-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of flue gas purification generally uses dilute sulfuric acid to wash the flue gas. With the continuous circulation of the system, the concentration of pollutants in the acid continues to increase, which has to be discharged from the system, thus generating dirty acid
However, due to the characteristics of large discharge, high content and complex composition of polluted acid wastewater, the sulfuration method and the ferrous sulfate-lime method are currently used in industrial production. slag
[0004] Due to the high construction and operating costs of slag yards, most of the domestic waste slag storage sites are unscientific and construction is not standardized. Safety and anti-seepage measures do not meet the relevant national requirements, and heavy metal ions and other pollutants in slag are easily It enters the surrounding soil, surface water and groundwater through leachate, which far exceeds the local ecological environment capacity, leading to the decline of river water quality and the pollution of drinking water for residents, which seriously affects the harmonious and stable development of the local social economy and restricts Sustained and healthy development of metal smelting industry
Aiming at the ecological and environmental problems caused by dirty acid residues, how to properly handle and dispose of dirty acid residues has become the focus of attention in the industry. Some institutions or units have done a lot of related research and exploration, and the main way is to carry out resource treatment so that it can be applied In the building materials industry, it achieves the effect of turning waste into treasure, but there is no such feasible, simple and practical treatment technology with certain economic value.

Method used

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  • Method for manufacturing autoclaved bricks by utilizing contaminated acid sludge

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Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing autoclaved bricks from dirty acid slag, comprising the steps of:

[0037] Step 1, drying: collect the dirty acid slag and put it in an oven, and dry it at 50°C;

[0038] Step 2, ball milling: Put the dried dirty acid slag into the ball mill, add triethanolamine after running for 10 minutes, the amount added is 0.02% of the mass of the dried dirty acid slag, continue to run for 15 minutes, then add quicklime and quartz sand, add The amount is respectively 2% and 3% of the mass of the dirty acid slag, run for 10 minutes;

[0039]Step 3. Stirring: Add the ball-milled material to the mixer, add river sand and stone chips for pre-mixing for 8 minutes, slowly add water to moisten, control the moisture content to 11%, and stir for 10 minutes; the added amount of the river sand is the ball-milled material 30% of the mass, the particle size is 0.5mm, and its silica content is greater than 70%, and the mud content is less than 2%; the addition of the stone...

Embodiment 2

[0046] A method for preparing autoclaved bricks from dirty acid slag, comprising the steps of:

[0047] Step 1, drying: collect the dirty acid slag and put it in an oven, and dry it at 60°C;

[0048] Step 2, ball milling: Put the dried dirty acid slag into the ball mill, and add triethanolamine after running for 12 minutes, the addition amount is 0.1% of the mass of the dried dirty acid slag, continue to run for 20 minutes, then add quicklime and quartz sand, add The amount is respectively 2.5% and 5% of the mass of dirty acid slag, run for 15 minutes;

[0049] Step 3. Stirring: Add the ball-milled material to the mixer, add river sand and stone chips for pre-mixing for 10 minutes, slowly add water to moisten, control the moisture content to 13%, and stir for 15 minutes; the added amount of the river sand is the ball-milled material The mass is 45%, the particle size is 2.0mm, and its silica content is greater than 70%, and the mud content is less than 2%; the added amount of...

Embodiment 3

[0056] A method for preparing autoclaved bricks from dirty acid slag, comprising the steps of:

[0057] Step 1, drying: collect the dirty acid slag and put it in an oven, and dry it at 55°C;

[0058] Step 2, ball milling: Put the dried dirty acid slag into the ball mill, add triethanolamine after running for 11 minutes, the addition amount is 0.06% of the mass of the dried dirty acid slag, continue to run for 18 minutes, then add quicklime and quartz sand, add The amount is respectively 2.3% and 4% of the mass of the dirty acid slag, running for 12 minutes;

[0059] Step 3. Stirring: Add the ball-milled material to the mixer, add river sand and stone chips for pre-mixing for 9 minutes, slowly add water to moisten, control the moisture content to 12%, and stir for 12 minutes; the added amount of the river sand is the ball-milled material The mass is 38%, the particle size is 1.2mm, and its silicon dioxide content is greater than 70%, and the mud content is less than 2%. The ad...

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Abstract

The invention discloses a method for manufacturing autoclaved bricks by utilizing contaminated acid sludge. The method comprises the steps of: I. drying: collecting and drying contaminated acid sludge; II. ball-milling: placing the dried contaminated acid sludge in a ball mill, adding a grinding additive and a chemical excitant to carry out ball milling; III. stirring: adding the ball-milled materials in a stirrer for stirring; IV. wheel milling: conveying the stirred materials in a wheel mill, adding ordinary Portland cement and adding water for wheel milling; V. compressing moulding: loading the wheel-milled materials in a standard brick mould, and placing a compression testing machine for pressure maintaining and then demoulding to obtain brick blanks; VI. static curing: placing the stamping formed brick blanks into a cement standard curing chamber for static curing; and VII. autoclaved curing: placing the brick blanks subjected to static curing into an autoclaved kettle, introducing vapor, carrying out high-temperature constant-pressure autoclaved curing, naturally cooling and taking out of the kettle to obtain the autoclaved bricks. The method solves the problem that the acidsludge pollutes biological environment and achieves the effect of changing wastes into valuables.

Description

technical field [0001] The invention relates to the fields of resource recycling and utilization and building materials, in particular to a method for preparing autoclaved bricks by utilizing polluted acid slag. Background technique [0002] Polluted acid slag is a by-product of zinc hydrometallurgy resource recovery process, which contains mercury, arsenic, cadmium, lead and other heavy metal poisonous substances that are most harmful to humans and animals. , can be absorbed by animals through various channels such as respiratory tract, digestive tract and skin. When these heavy metals accumulate to a certain extent in the animal body, it will directly affect the growth and development, physiological and biochemical functions of the animal, and even cause the death of the animal. Since heavy metals cannot be degraded by microorganisms, they can only undergo mutual transformation between various forms in the environment. Therefore, the elimination of their pollution is extr...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 周长波杜兵王积伟于秀玲裴倩倩潘涔轩王璠梁乾
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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