阅读说明：本技术 一种高效利用粉煤灰制备保温砌块的方法 (Method for preparing heat-insulation building block by efficiently utilizing fly ash ) 是由 王勇 王政 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种高效利用粉煤灰制备保温砌块的方法,包括如下步骤：将粉煤灰、尖晶石、石膏粉、水泥熟料、水混合研磨均匀,送入反应釜中,升温,保温,冷却至室温,过滤,干燥得到预处理粉煤灰；向预处理粉煤灰中加入硅酸乙酯、秸秆、碳酸钙、丙烯酸酯溶液、水泥熟料混合研磨均匀,加水,升温,搅拌,压坯,干燥,煅烧,冷却得到保温砌块。本发明采用粉煤灰制作出符合国家标准的混凝土砌块砖,有效缓解了粉煤灰含量高导致抗压强度低,保温隔热效果差,破损率的缺点,有效缓解了粉煤灰带来的严重污染问题。(The invention discloses a method for preparing a heat-insulating building block by efficiently utilizing fly ash, which comprises the following steps: mixing and grinding the fly ash, spinel, gypsum powder, cement clinker and water uniformly, feeding the mixture into a reaction kettle, heating, preserving heat, cooling to room temperature, filtering and drying to obtain pretreated fly ash; adding ethyl silicate, straws, calcium carbonate, an acrylate solution and cement clinker into the pretreated fly ash, mixing and grinding uniformly, adding water, heating, stirring, compacting, drying, calcining and cooling to obtain the heat-insulating building block. The invention adopts the fly ash to manufacture the concrete building block brick which meets the national standard, effectively relieves the defects of low compressive strength, poor heat preservation and insulation effects and breakage rate caused by high content of the fly ash, and effectively relieves the problem of serious pollution caused by the fly ash.)

1. The method for preparing the heat-insulation building block by efficiently utilizing the fly ash is characterized by comprising the following steps of:

s1, mixing and grinding the fly ash, spinel, gypsum powder, cement clinker and water uniformly, feeding the mixture into a reaction kettle, heating, preserving heat, cooling to room temperature, filtering and drying to obtain pretreated fly ash;

s2, adding ethyl silicate, straws, calcium carbonate, acrylate solution and cement clinker into the pretreated fly ash, mixing and grinding uniformly, adding water, heating, stirring, compacting, drying, calcining and cooling to obtain the heat-preservation building block.

2. The method for preparing the heat-insulating building block by efficiently utilizing the fly ash as claimed in claim 1, wherein in S1, the temperature is raised to 150 ℃ and 180 ℃, and the heat is preserved for 20-30 h.

3. The method for preparing the heat-insulating building block by efficiently utilizing the fly ash as claimed in claim 1, wherein in S1, the weight ratio of the fly ash, the spinel, the gypsum powder and the cement clinker is 80-120: 2-5: 8-15: 5-10.

4. The method for preparing the heat-preservation building block by efficiently utilizing the fly ash as claimed in claim 1, wherein in S2, water is added until the water content is 20-35wt%, the temperature is raised to 50-60 ℃, and the stirring is carried out for 30-45 min.

5. The method for preparing the heat-preservation building block by efficiently utilizing the fly ash as claimed in claim 1, wherein in S2, the drying temperature is 60-75 ℃, the drying time is 1.5-2.5h, the calcining temperature is 180-220 ℃, and the calcining time is 2-3 h.

Technical Field

The invention relates to the technical field of concrete building blocks, in particular to a method for preparing a heat-insulating building block by efficiently utilizing fly ash.

Background

Fly ash is the tiny soot particles that are discharged from the combustion process of a fuel (mainly coal). The particle size is generally between 1 and 100. mu.m. Also known as fly ash or fly ash. The fine solid particles in the flue gas ash resulting from the combustion of the fuel. Such as fine ash collected from flue gases from coal fired power plants. The fly ash is formed by cooling pulverized coal after entering a hearth at 1300-1500 ℃ after being subjected to heat absorption by a hot surface under the suspension combustion condition. Most of the fly ash is spherical due to the action of surface tension, the surface is smooth, and micropores are small. Some of the particles are adhered by colliding with each other in a molten state, and thus, they become honeycomb-shaped composite particles having rough surfaces and many edges. The chemical composition of fly ash is related to the composition of the coal, the particle size of the coal, the type of boiler, the combustion condition and the collection mode. The amount of fly ash discharged is directly related to the ash content of the coal. According to the coal consumption condition in China, about 250-300kg of fly ash is generated by burning 1t of coal. If a large amount of fly ash is not controlled or treated, air pollution can be caused, the fly ash enters water to foul a river channel, and certain chemical substances in the fly ash cause damage to organisms and human bodies.

If with fly ash resource utilization, add to the concrete building block brick in, will very big protection farming soil, nevertheless adopt fly ash to prepare the concrete building block brick at present and have compressive strength low, the thermal-insulated poor problem of effect that keeps warm, urgent need to solve.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a method for preparing a thermal insulation block by efficiently utilizing fly ash, the fly ash is adopted to prepare a concrete block brick meeting the national standard, the defects of low compressive strength, poor thermal insulation effect and breakage rate caused by high fly ash content are effectively overcome, and the problem of serious pollution caused by the fly ash is effectively solved.

The invention provides a method for preparing a heat-insulating building block by efficiently utilizing fly ash, which comprises the following steps:

s1, mixing and grinding the fly ash, spinel, gypsum powder, cement clinker and water uniformly, feeding the mixture into a reaction kettle, heating, preserving heat, cooling to room temperature, filtering and drying to obtain pretreated fly ash;

s2, adding ethyl silicate, straws, calcium carbonate, acrylate solution and cement clinker into the pretreated fly ash, mixing and grinding uniformly, adding water, heating, stirring, compacting, drying, calcining and cooling to obtain the heat-preservation building block.

Preferably, in S1, the temperature is raised to 150 ℃ and 180 ℃, and the temperature is maintained for 20-30 h.

Preferably, in S1, the weight ratio of the fly ash, the spinel, the gypsum powder and the cement clinker is 80-120: 2-5: 8-15: 5-10.

Preferably, in S2, water is added until the water content is 20-35wt%, the temperature is raised to 50-60 ℃, and the stirring is carried out for 30-45 min.

Preferably, in S2, the drying temperature is 60-75 ℃, the drying time is 1.5-2.5h, the calcining temperature is 180-220 ℃, and the calcining time is 2-3 h.

The cement clinker is uniformly ground with the fly ash, the spinel and the gypsum powder and then is sent into the reaction kettle, the cement clinker is carbonized in the reaction kettle and is highly dispersed with the fly ash, the spinel and the gypsum powder, so that the defect of low compressive strength of the fly ash is overcome, the cement clinker is further compounded with the ethyl silicate and the straws, the bonding and forming effects are excellent under the action of the calcium carbonate, the acrylate solution and the cement clinker, a large amount of loose hollow structures are formed inside the cement clinker after sintering, the heat preservation effect is good, and the weight of a brick body can be obviously reduced.

According to the novel environment-friendly idea popularized by the state, the concrete building block brick meeting the national standard is manufactured by adopting the fly ash, so that the defects of low compressive strength, poor heat preservation and insulation effects and breakage rate caused by high fly ash content are effectively overcome, and the problem of serious pollution caused by the fly ash is effectively solved.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.