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Lightweight high-strength calcium silicate board and preparation process thereof

A technology of calcium silicate board and preparation process, applied in the field of building materials, can solve the problems of reducing quality, increasing the deformation coefficient of calcium silicate board, darkening color, etc., to improve strength and qualification rate, improve impermeability and waterproof performance, The effect of promoting the formation of crystals

Pending Publication Date: 2019-05-03
建丰建筑科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of cement added in the production of calcium silicate boards is not easy to control. If the amount of cement is small, it will not enhance the mechanical strength of calcium silicate boards; if the amount is too much, the color of calcium silicate board products will become darker and lower. quality, and will increase the coefficient of deformation of the calcium silicate board, so that the product cannot meet the requirements for use
Moreover, if the cement contains excessive free calcium oxide (quicklime) or magnesium oxide, because the curing reaction is slower than that of cement, after the cement has set and hardened, the free calcium oxide will start to react and expand, which may crack the mortar or concrete, and cause Increase in defective rate
[0005] In order to solve the above-mentioned defects in the existing calcium silicate board production technology, the existing technology uses slaked lime (slaked lime) to replace quicklime. Although it can effectively reduce the cracking problem caused by the slaking reaction of quicklime, it will cause higher costs. , and the improper proportion of slaked lime will cause insufficient reaction of siliceous-calcium raw materials in the autoclaving process, resulting in insufficient formation of tobermullite crystals or the formation of other substitute components, resulting in the failure of calcium silicate board products The mechanical strength is not high, but it will cause the strength of the calcium silicate board to be substandard

Method used

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  • Lightweight high-strength calcium silicate board and preparation process thereof
  • Lightweight high-strength calcium silicate board and preparation process thereof

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preparation example Construction

[0034] The preparation process of the light-weight high-strength calcium silicate board of the present invention includes fiber pulp preparation, quartz mortar preparation, pulping, refining and pre-stirring, board making, pre-curing, autoclaving curing, drying, and shaping steps, specifically as follows :

[0035] A. Preparation of fiber pulp: Pulp board paper and recovered waste kraft paper and / or waste cement bag paper are respectively added to a pulper in proportion to add water to loosen, after loosening, add water to dilute and grind to prepare paper pulp;

[0036] B. Quartz mortar preparation: Feed quartz sand into the mill and add water to grind to -200 mesh>95%, and prepare mortar;

[0037] C. Pulping: Send the pulp into the mixer, and add mortar, slaked lime powder, cement, dry fly ash and filler, bentonite, flocculant in sequence in proportion, and fully mix to prepare the slurry;

[0038] D. Refining and pre-mixing: The slurry is evenly supplied to the refiner for...

Embodiment 1

[0051] S100: Add 2000kg of purchased pulp board paper and 200kg of recycled waste kraft paper to the vertical medium-consistency hydraulic pulper, add water to fully loosen the material, and the time for each pot of material to be loosened is 40 minutes. The pulp after loosening is pumped Put it into the pulp tank, add water to dilute to 4-6%, and enter the double disc refiner for rough grinding to improve the beating degree of the pulp. Pulp is sent to the pulp metering tank for standby.

[0052] S200: Feed qualified quartz sand with a SiO2 content of more than 95% and fineness into the mill, add water and grind to -200 mesh and not less than 90%, and prepare a mortar with a concentration of 20%.

[0053] S300: Send 5000kg of pulp with a concentration of 10% and 30000kg of mortar with a concentration of 20% into the counter-current mixer, and then respectively mix 1000kg of 425# ordinary Portland cement, 1000kg of slaked lime powder, and 500kg of dry fly ash , 200kg of fille...

Embodiment 2

[0064] S100: Add 2,000kg of purchased pulp board paper, 500kg of recycled waste kraft paper, and 1,500kg of cement bag paper into a vertical medium-consistency hydraulic pulper, and add water to fully loosen it. The time for each pot of material is 60 minutes. The pulp is pumped into the pulp tank, diluted with water to 4-6%, and then enters the double-disc refiner for dredging, so as to improve the beating degree of the pulp. The pulp with a concentration of 5% is sent to the pulp metering tank for standby.

[0065] S200: Feed qualified quartz sand with a SiO2 content of more than 95% and fineness into the mill, add water and grind to -200 mesh and not less than 90%, and prepare a mortar with a concentration of 20%.

[0066] S300: Send 20,000kg of pulp with a concentration of 5% and 19,500kg of mortar with a concentration of 20% into the counter-current mixer, and then respectively mix 1,500kg of 425# ordinary Portland cement, 1,500kg of slaked lime powder, and 800kg of dry f...

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Abstract

The invention discloses a lightweight high-strength calcium silicate board and a preparation process thereof. The light high-strength calcium silicate board is composed of the following components, inpercentages by mass: 10-20% of cement, 35-60% of quartz sand powder, 10-20% of slaked lime powder, 5-10% of fly ash, 5-10% of reinforced cellulose, 2-5% of a filler, 5-10% of bentonite, and 1-3% of aflocculating agent. The preparation process includes the steps of fiber slurry preparation, quartz sand slurry preparation, pulping, defibrination and pre-stirring, board preparation, pre-curing, autoclaved curing, drying, and shaping. According to the lightweight high-strength calcium silicate board provided by the invention, a synergistic effect of different materials is fully played through ingenious proportioning of the materials, especially the cement, the slaked lime powder, the fly ash and the bentonite are adopted, so that the difficult problem that mortar or concrete is easily cracked because quicklime and cement are directly adopted in a traditional method can be avoided, formation of tobermorite crystals in the preparation process can be promoted, and the strength and qualification rate of the calcium silicate board can be improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-strength, high-toughness, fire-proof and moisture-resistant light-weight high-strength calcium silicate board and a preparation process thereof. Background technique [0002] Modern building materials require low energy consumption, land saving, and environmental friendliness. Traditional clay bricks are used as building materials, and their raw materials mainly come from cultivated land. Mining clay will cause a lot of vegetation damage and soil erosion; moreover, the energy consumption in the sintering process is high. Moreover, the quality of clay bricks is relatively heavy. In order to ensure the strength of the wall panels after construction, it will inevitably cause problems such as a decrease in the load-bearing capacity of the structural layer and a decrease in space utilization, and the paving efficiency is also low. As the construction indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B111/40
Inventor 李振宇曾译民
Owner 建丰建筑科技有限公司
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