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Method for preparing xonotlite type thermal-insulation fireproof material from sintered red mud

A technology of thermal insulation and fireproof material and tobermorite type, which is applied in the field of red mud hydrothermal using sintering method, can solve the problems of low thermal conductivity, environmental pollution, waste of resources, etc., and achieves simple preparation process, reduced mining, easy to use effect of operation

Inactive Publication Date: 2018-11-30
内蒙古中建亚太建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of environmental pollution and waste of resources in the existing sintering red mud, and to provide a method for preparing xonotlite-type thermal insulation and fireproof materials from sintering red mud. The method uses sintering red mud as calcium High-quality raw materials and some siliceous raw materials, which belong to industrial solid waste, have the advantages of wide sources and low cost; the obtained xonotlite-type thermal insulation materials have good compressive and flexural strength and low thermal conductivity

Method used

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  • Method for preparing xonotlite type thermal-insulation fireproof material from sintered red mud
  • Method for preparing xonotlite type thermal-insulation fireproof material from sintered red mud
  • Method for preparing xonotlite type thermal-insulation fireproof material from sintered red mud

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Embodiment 1

[0029]The sintering red mud used in this example was taken from an alumina plant in Hohhot, Inner Mongolia, and the quartz sand was taken from Kubuqi Desert, Ordos, Inner Mongolia. The chemical composition is shown in Table 1.

[0030] Table 1 Chemical composition of sintering red mud and quartz sand

[0031]

[0032]

[0033] The xonotlite in this embodiment is mixed with 80 kg of the above-mentioned sintering red mud and 20 kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 1.21:1, and then adding 0.3 kg of calcium sulfate and 0.3 kg of aluminum chloride, Use a ball mill to grind it until all particle sizes are less than 0.18mm, then add 3018kg of water according to the liquid-solid ratio of 30 and mix evenly, then put it into a high-pressure reactor. Stir at a high speed and keep warm for 4 hours. After the reaction, cool the product to 90°C to obtain a xonotlite-type slurry. Pump the slurry into the buffer tank, add 3.8kg of glass f...

Embodiment 2

[0037] The sintering red mud used in this example was obtained from an alumina plant in Shanxi, and the silica fume was obtained from a metallurgical group in Ordos, Inner Mongolia. The chemical composition is shown in Table 2.

[0038] Table 2 Chemical composition of sintering red mud and silica fume

[0039]

[0040] The xonotlite in this embodiment is mixed with 78kg of the above-mentioned sintering red mud and 22kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 1.02:1, and then adding 0.4kg of aluminum chloride, 0.6kg of aluminum sulfate and 0.7kg of barium chloride, use a ball mill to grind it until all particle sizes are less than 0.16mm, then add 3559.5 water according to the liquid-solid ratio of 35 and mix evenly, then put it into a high-pressure reactor, control the reaction temperature to 240 ° C, and the reaction pressure Under the condition of 3.45MPa, stir and keep warm at a speed of 200rpm for 4.0h. After the reaction, cool...

Embodiment 3

[0043] The sintering red mud used in this example was taken from an alumina plant in Shanxi, and the white carbon black was taken from a chemical plant in Shandong. The chemical composition is shown in Table 3.

[0044] Table 3 Chemical composition of sintering red mud and silica fume

[0045]

[0046] The xonotlite in this embodiment is mixed with 75 kg of the above-mentioned sintering red mud and 25 kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 1.00:1, and then adding 0.2 kg of aluminum nitrate, 0.3 kg of barium sulfate and 0.5 kg sodium sulfate, use a ball mill to grind it until all particle sizes are less than 0.12mm, then add 2020kg of water according to the liquid-solid ratio of 20 and mix evenly, then put it into a high-pressure reactor, control the reaction temperature to 250°C, and the reaction pressure to 4.05MPa Stir at a speed of 250rpm and keep warm for 3.0 hours under the same conditions. After the reaction, cool the pro...

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Abstract

The invention relates to a method for preparing a xonotlite type thermal-insulation fireproof material from sintered red mud, and belongs to the field of inorganic thermal insulation materials. Raw materials used in the method include a mixture, a trace additive, a reinforcing fiber, an inorganic glue and a waterproof agent. The method comprises the following steps: mixing the mixture with water,injecting the obtained solution into a dynamic reaction kettle, carrying out a reaction to obtain a xonotlite slurry, and adding the reinforcing fiber; filtering the slurry, and sequentially adding the inorganic glue and the waterproof agent; and carrying out compression molding and drying to obtain the xonotlite type thermal-insulation material. The main raw material sintered red mud is a solid waste formed by extracting alumina from bauxite or high-alumina fly ash through an alkali lime sintering process, so the production cost of xonotlite is greatly reduced, the raw materials have wide sources, the reaction time is short, and the obtained thermal-insulation fireproof material has a high strength, a light unit weight and a good water repellency; and the method for preparing the xonotlite is simple, can consume the solid waste generated in the alumina production process, and suitable for being industrially promoted.

Description

technical field [0001] The present invention relates to a method for preparing xonotlite-type thermal insulation and fireproof materials from sintering red mud, in particular to a method for hydrothermally synthesizing xonotlite type thermal insulation and fireproof boards from sintering red mud, which belongs to the field of inorganic thermal insulation materials. It is used in the fields of fire door core panels, ship bulkheads, steel structure insulation and fire protection, building exterior wall fire insulation, building flue ducts, and electrolytic cell insulation panels. Background technique [0002] Xonotlite is the main mineral component of calcium silicate insulation materials. The temperature of the insulation material composed of it can reach 1000 ° C. At the same time, xonotlite has the advantages of small bulk density, high temperature thermal stability and low thermal conductivity. Therefore, It is widely used as the main raw material of lightweight thermal in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
CPCC04B30/00C04B2111/00017C04B2201/20C04B2201/32C04B2201/50C04B18/0409C04B14/06
Inventor 赵春光王志谦
Owner 内蒙古中建亚太建材科技有限公司
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