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A kind of autoclaved aerated block and its preparation method

An autoclaved aeration and block technology is applied in the field of silicate building materials, which can solve the problems of increased cement production cost, high transportation cost and high water content, and achieves the effects of low cost, simple process and reduced leaching content.

Active Publication Date: 2015-11-18
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it contains gypsum, polluted acid slag has the potential to replace gypsum-made concrete blocks, but because it contains cadmium and arsenic, when it is directly used as a gypsum substitute to make concrete blocks, it is easy to leach and cause secondary pollution, and water High part content, high transportation cost, increase the cost of cement production, and limit its application in cement production

Method used

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  • A kind of autoclaved aerated block and its preparation method
  • A kind of autoclaved aerated block and its preparation method
  • A kind of autoclaved aerated block and its preparation method

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preparation example Construction

[0030] The present invention also provides a method for preparing the autoclaved aerated block of the present invention, the method comprising the steps of:

[0031] S1. Mixing siliceous raw materials with polluted acid slag to obtain siliceous slurry;

[0032] S2, mixing the siliceous slurry in step S1 with cement, ferrous sulfate and quicklime to obtain a mixed slurry;

[0033] S3, mixing the mixed slurry in step S2 with aluminum powder to obtain casting slurry;

[0034] S4. Perform pouring, pre-curing, cutting and autoclaving curing of the pouring slurry to obtain an autoclaved aerated block.

[0035] The present invention utilizes the similar properties of heavy metal cadmium and calcium, and by setting an autoclaved curing step, cadmium ions react with silicate during the autoclaved curing process to form cadmium metasilicate or cadmium silicate, which is solidified into hydrogarnet and In tober mullite crystals, cadmium ions can replace part of the calcium element to f...

Embodiment 1

[0049] 1. Material selection: the water content of refined polluted acid slag is 35.0% by mass, the mass percentage of calcium sulfate is 30.0%; the mass percentage of silicon dioxide in fly ash is 47.0%, and the mass percentage of alumina is 27.5% %, calcium oxide mass percentage content is 4.5%, iron oxide mass percentage content is 3.0%; calcium oxide content in quicklime is 85%; hydrated ferrous sulfate is industrial grade, hydrated ferrous sulfate content is 95%; ordinary silicate cement.

[0050] 2. Add fly ash and water to the ball mill according to the mass percentage of fly ash (already contains 5% water): water ratio of 57:43, and carry out wet grinding or mixing to control the particle fineness, and more than 90% of the particles are over 180 Add dirty acid residue, at room temperature, under 150 rpm, stir for 2.0 hours, and prepare a siliceous slurry for subsequent use;

[0051] 3. Heat the siliceous slurry to 42°C, then add cement, hydrated ferrous sulfate, and q...

Embodiment 2

[0058] 1. Material selection: the water content of refined polluted acid slag is 35.0% by mass, the mass percentage of calcium sulfate is 30.0%; the mass percentage of silicon dioxide in fly ash is 47.0%, and the mass percentage of alumina is 27.5% %, calcium oxide mass percentage content is 4.5%, iron oxide mass percentage content is 3.0%; calcium oxide content in quicklime is 85%; hydrated ferrous sulfate is industrial grade, hydrated ferrous sulfate content is 95%; ordinary silicate cement.

[0059] 2. Put fly ash and water into the ball mill according to the mass percentage of fly ash: water ratio of 57:43 for wet grinding or mixing, control the particle fineness, more than 90% of the particles pass 180 mesh, add dirty acid slag, room temperature Under 150 rpm, stir for 3.0 hours to prepare a siliceous slurry for subsequent use;

[0060] 3. Heat the siliceous slurry to 40°C, then add cement, hydrated ferrous sulfate, and quicklime, and stir and mix for 1.0 minute to obtai...

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Abstract

The invention provides an autoclave aerocrete building block and a preparation method thereof. The autoclave aerocrete building block is prepared from the following raw materials in parts by weight: 65.0-80.0 parts of silica raw material, 2.0-5.0 parts of polluted acid sludge, 5.0-15.0 parts of cement, 0.2-0.5 part of ferrous sulfate heptahydrate, 10.0-15.0 parts of quicklime and 0.07-0.1 part of aluminum powder. The polluted acid sludge contains water and calcium sulfate; and on the basis of the total weight of the polluted acid sludge, the water content is less than 35%, and the calcium sulfate content is greater than 25%. The strength and heavy metal leaching property of the autoclave aerocrete building block can satisfy the requirements; and by using the polluted acid sludge instead of the gypsum, the method performs secondary resource utilization on the polluted acid, thereby lowering the treatment cost of the polluted acid sludge.

Description

technical field [0001] The invention belongs to the field of silicate building materials, in particular to an autoclaved aerated block and a preparation method thereof. Background technique [0002] For filling walls in building works or in building frames, clay bricks or cement sand bricks have been used for many years. However, firing clay bricks destroys cultivated land, consumes energy, and the weight of the wall and the load on the frame are large, resulting in high construction costs. [0003] With the acceleration of industrialization, the discharge of a large number of industrial waste residues such as fly ash, metallurgical and chemical waste residues, coal gangue, and construction dregs in China has increased year after year. my country produces more than 100 million tons of various industrial solid wastes every year, and the comprehensive utilization rate is only 51.9% %, speeding up the development of fly ash and construction dregs as new wall materials is an imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B28/14C04B11/26
Inventor 窦传龙胡舜钦林文军李正明魏文武廖贻鹏
Owner ZHUZHOU SMELTER GRP
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