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Method for preparing tobermorite type thermal-insulating and fireproofing material from sintered red mud

A technology of thermal insulation and fireproof material and tobermorite, applied in the field of inorganic thermal insulation materials, can solve the problems of waste of resources, low thermal conductivity, environmental pollution, etc., and achieve the effects of easy operation, simple preparation process and reduction of mining.

Inactive Publication Date: 2018-12-18
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 tobermine-type thermal insulation and fireproof materials from sintering red mud. The method uses sintering red mud as calcium quality raw materials and some siliceous raw materials, the obtained tobernaite type insulation material has good compressive and flexural strength, low thermal conductivity

Method used

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  • Method for preparing tobermorite type thermal-insulating and fireproofing material from sintered red mud
  • Method for preparing tobermorite type thermal-insulating and fireproofing material from sintered red mud
  • Method for preparing tobermorite type thermal-insulating and fireproofing material from sintered red mud

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Experimental program
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Effect test

Embodiment 1

[0030] 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.

[0031] Table 1 Chemical composition of sintering red mud and quartz sand

[0032]

[0033]

[0034] The tobermorite of this embodiment is mixed with 70kg of the above-mentioned sintering red mud and 30kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 0.9031:1, and then adding 0.1kg of aluminum chloride, 0.3kg of aluminum sulfate and 0.4kg of barium chloride, use a ball mill to grind it until all particle sizes are less than 0.2mm, then add 2016kg 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 190 ° C, and the reaction pressure Stir at 150rpm at 1.60MPa and keep warm for 3 hours. After the reaction, cool the product ...

Embodiment 2

[0038] 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.

[0039] Table 2 Chemical composition of sintering red mud and silica fume

[0040]

[0041] The tobermorite of this embodiment is mixed with 65 kg of the above-mentioned sintering red mud and 35 kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 0.7225:1, and then adding 0.2 kg of calcium sulfate, 0.3 kg of barium sulfate and 0.6 kg sodium sulfate, use a ball mill to grind it until all particle sizes are less than 0.18mm, then add 1516.5kg of water according to the liquid-solid ratio of 15 and mix evenly, then put it into a high-pressure reactor, control the reaction temperature to 210 ° C, and the reaction pressure to 1.90 Under the condition of MPa, stir and keep warm for 6 hours at a speed of 200rpm. After the r...

Embodiment 3

[0044] 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.

[0045] Table 3 Chemical composition of sintering red mud and silica fume

[0046]

[0047] The tobermorite of this embodiment is after mixing 68kg of the above-mentioned sintering red mud and 32kg of the above-mentioned quartz sand according to the calcium-silicon molar ratio of 0.8470:1, and then adding 0.3kg of aluminum nitrate and 0.4kg of aluminum chloride, Use a ball mill to grind it until all particle sizes are less than 0.12mm, then add 1208.4 water to mix evenly according to the liquid-solid ratio of 12, and then put it into a high-pressure reactor. Stir at a high speed and keep warm for 5 hours. After the reaction, cool the product to 90°C to obtain a tobermortite-type slurry. Pump the slurry into the buffer tank, add 4kg of glass fiber and mix it evenly, ...

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Abstract

The invention relates to a method for preparing a tobermorite type thermal-insulating and fireproofing material from sintered red mud, and belongs to the field of inorganic thermal insulating materials. Raw materials of the tobermorite type thermal-insulating and fireproofing material comprise a mixture, a trace additive, reinforced fibers, an inorganic glue and a waterproof agent. The method comprises the following steps: injecting the mixture and water into a dynamic reactor, carrying out hydrothermal synthesis for 1.0-8.0 h by using 180-240 DEG C superheated steam to obtain a tobermorite slurry, and adding the reinforced fibers; filtering the obtained slurry, and sequentially adding the inorganic glue and the waterproof agent; and carrying out compression molding, and performing dryingto obtain the tobermorite type thermal-insulating and fireproofing material. The main raw material sintered red mud is a solid waste formed by extracting alumina from bauxite or high-alumina fly ash through a soda lime sintering process, so the production cost of tobermorite is greatly reduced, the raw materials have wide sources, the reaction time is short, and the obtained thermal-insulating andfireproofing material has a high strength, a light unit weight and a good water repellency; and the method for preparing the tobermorite is simple, can consume the solid waste generated in the alumina production process, and is suitable for being industrially promoted.

Description

technical field [0001] The invention relates to a preparation method of tobermelite type thermal insulation and fireproof material, in particular to a method for preparing tobermelite type thermal insulation and fireproof material by sintering red mud, which belongs to the field of inorganic thermal insulation materials and is mainly used for fireproof door core boards , Ship bulkheads, steel structure thermal insulation and fire protection, building exterior wall fire protection and thermal insulation, building flue ducts and electrolytic cell thermal insulation panels and other fields. Background technique [0002] Tobermorite is one of the main mineral components of calcium silicate insulation materials. The temperature of insulation materials composed of it can reach 650°C. At the same time, tobermorite has small bulk density, good thermal stability at high temperature, and is resistant to bending and compression. Due to its advantages of high strength and low thermal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B14/04C04B111/28
CPCC04B14/043C04B28/26C04B2111/28C04B2201/20C04B2201/32C04B2201/50C04B14/42C04B24/42
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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