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Autoclaved sand-lime brick and preparation method thereof

A technology of autoclaved lime-sand bricks and fly ash, which is applied in the field of building materials and can solve the problems of difficult disposal of industrial solid waste, no expansion, and little expansion.

Pending Publication Date: 2020-04-03
中盐安徽红四方新型建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a new method for comprehensive utilization of lime-based (calcium carbide slag) stabilization / solidification technology and comprehensive utilization of new technology for autoclaved lime-sand brick. The effect of capacity or non-compatibilization solves the problem of difficult industrial solid waste disposal

Method used

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  • Autoclaved sand-lime brick and preparation method thereof
  • Autoclaved sand-lime brick and preparation method thereof
  • Autoclaved sand-lime brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The raw materials for preparing autoclaved lime-sand bricks are: 20% fly ash, 20% carbide slag, 5% modifier 1, 8% modifier 2, 12% tailings and 35% aggregate ( Construction waste+coarse slag ash+sludge, in the aggregate, construction waste accounts for 50% by weight, coarse slag ash accounts for 30% by weight, and sludge accounts for 20% by weight).

[0052] The composition of the modifier 1 is calcium oxide: 0.5%, aluminum oxide: 0.2%, free sodium is less than 0.04%, the rest is silicon dioxide, and its loss on ignition is 2%, and the moisture content is less than 0.5%. %; the particle size of the modifier 1 is 0.045mm square hole sieve, %, and the fineness is greater than 12;

[0053] The composition of the modifier 2 is aluminum oxide: 40%, silicon dioxide: 35%, iron oxide: 4%, the rest is calcium oxide, and its loss on ignition is not more than 8%. at 15%.

[0054] The preparation method is as follows: the above-mentioned components are mixed, pressed into bricks b...

Embodiment 2

[0056] The raw materials for preparing autoclaved lime-sand bricks are: 20% fly ash, 18% carbide slag, 7% modifier 1, 10% modifier 2, 10% tailings and 35% aggregate ( Construction waste+coarse slag ash+sludge, in the aggregate, construction waste accounts for 50% by weight, coarse slag ash accounts for 35% by weight, and sludge accounts for 15% by weight). The composition of the modifying agent 1 and modifying agent 2 is the same as that in Example 1.

[0057] The preparation method is as follows: the above-mentioned components are mixed, pressed into bricks by a Lasko hydraulic brick machine imported from Germany, the pressure of the brick machine is 125 bar, and steamed in an autoclave to obtain an autoclaved lime-sand brick. The steam curing process is saturated steam 1.0Mpa, temperature: 180°C, and constant pressure for 4 hours.

Embodiment 3

[0059] The raw materials for preparing autoclaved lime-sand bricks are: 20% fly ash, 18% carbide slag, 10% modifier 1, 10% modifier 2, 7% tailings and 35% aggregate ( Construction waste+coarse slag ash+sludge, in the aggregate, construction waste accounts for 45% by weight, coarse slag ash accounts for 35% by weight, and sludge accounts for 20% by weight). The composition of the modifying agent 1 and modifying agent 2 is the same as that in Example 1.

[0060] The preparation method is as follows: the above-mentioned components are mixed, pressed into bricks by a Lasko hydraulic brick machine imported from Germany, the pressure of the brick machine is 125 bar, and steamed in an autoclave to obtain an autoclaved lime-sand brick. The steam curing process is saturated steam 1.0Mpa, temperature: 180°C, and constant pressure for 4 hours.

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Abstract

The invention provides an autoclaved sand-lime brick and a preparation method thereof. The autoclaved sand-lime brick is prepared from the following raw materials: fly ash, calcium carbide powder, tailings, an aggregate, a modifier 1 and a modifier 2; the aggregate is composed of construction waste, coarse slag ash and industrial sludge. In the cement solidification process of industrial solid waste, due to a strong alkaline medium formed by cement hydration, heavy metal ions generate insoluble hydroxide precipitates, oxide precipitates and the like, so that the leaching amount of the industrial solid waste is reduced, an autoclaved lime-sand wall material is prepared, and the influence of the autoclaved lime-sand wall material on human bodies and the ecological environment is effectivelyreduced. Besides, in the production process of the autoclaved brick, the modifier is added besides the industrial solid waste, so that the autoclaved brick with high strength can be produced at lowervapor pressure and temperature, the cost is saved, the energy consumption is reduced, the safety production can be further guaranteed, and the production hidden danger caused by over-high vapor pressure is avoided.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an autoclaved lime-sand brick and a preparation method thereof. Background technique [0002] For the stabilization / solidification technology used in the treatment of industrial solid waste containing heavy metals, incineration / landfill / solidification technologies are traditionally used. However, incineration will produce secondary pollution (mainly nitrogen sulfide, fly ash, etc.), landfill occupies a large amount of land resources, and the investment cost is high. [0003] Zhang Shuguang et al. (Zhang Shuguang, et al., Manganese tailings-based cementitious material formulation optimization and hydration mechanism analysis [J]. Journal of Environmental Engineering, 2017 (1), pp. 535-540) studied the use of industrial solid waste instead of cement as Cementitious materials are the development trend of solid waste resource utilization, but at present, there...

Claims

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Application Information

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IPC IPC(8): C04B30/00
CPCC04B30/00C04B2201/50C04B18/08C04B22/064C04B18/04C04B18/16C04B18/0418C04B22/06
Inventor 韩凯锋凌辉勋孙梦雅王涛杨旭东赵勇张志强王国防
Owner 中盐安徽红四方新型建材科技有限公司
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