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Preparation method for xonotlite type heat-preserving material

A technology of tobermorite type, thermal insulation material, applied in the field of thermal insulation materials and industrial solid waste recycling, can solve the problems of large corrosion of equipment, high energy consumption, difficult recovery of waste acid, etc., to solve pollution and improve economic benefits , the effect of good compressive strength

Active Publication Date: 2015-11-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the alumina content in fly ash is as high as 50%, which is equivalent to medium-grade bauxite, there are many studies on the extraction of alumina from fly ash in my country. Among them, the high-temperature roasting of alkaline method requires a temperature above 1300°C, which requires high energy consumption. ; and although the acid method can be realized at a lower temperature of 200 ° C, the acid has a great corrosion on the equipment, and the problem that the waste acid is difficult to recycle is not easy to solve
For this reason, CN102476820A discloses a method for extracting alumina from fly ash by a wet method, which effectively solves the above problems, but the sub-molten salt dealuminated fly ash after the aluminum extraction has become a new solid waste. Therefore, it is necessary to develop its comprehensive utilization products
[0007] At the same time, two kinds of industrial solid waste after aluminum extraction by sub-molten salt method, namely, sub-molten salt dealuminated red mud and dealuminated fly ash, are used as the main raw materials and a small amount of siliceous raw material is added to adjust the reasonable calcium-silicon ratio. Wollastonite and its method of being used as insulation material have not been reported so far

Method used

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  • Preparation method for xonotlite type heat-preserving material
  • Preparation method for xonotlite type heat-preserving material
  • Preparation method for xonotlite type heat-preserving material

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This example uses sub-fused salt dealuminated red mud and dealuminated fly ash as raw materials, which contain 26.99% SiO 2 , 29.84% CaO, 11.90% Na 2 O, 8.51% Fe 2 o 3 , 6.31% TiO 2 The dealuminated red mud accounts for 70% of the solid phase; contains 33.26% SiO 2 , 34.42% CaO, 15.88% Na 2 O sub-molten salt dealuminated fly ash accounted for 30% of the solid phase. The above raw materials were mixed with silica by CaO / SiO 2 The molar ratio is 1.0 for batching, dissolved in water with a liquid-solid ratio of 40mL / g and mixed thoroughly. Put the slurry into the reaction kettle, raise the temperature to 250°C, and keep it warm for 4 hours to carry out hydrothermal reaction. After the reaction, the slurry is vacuum filtered and fully rinsed; For slag, wet slag with a water content of about 60% is pressed and molded with a mold under a molding pressure of 20 MPa. After holding the pressure for 5 minutes, it is demolded and dried at 150°C for 3 hours. The bulk densit...

Embodiment 2

[0047] This example uses sub-fused salt dealuminated red mud and dealuminated fly ash as raw materials, which contain 27.19% SiO 2 , 28.84% CaO, 12.90% Na 2 O, 7.51% Fe 2 o 3 , 5.31% TiO 2 The dealuminated red mud accounts for 50% of the solid phase; contains 33.06% SiO 2 , 34.55% CaO, 15.78% Na 2 O sub-molten salt dealuminated fly ash accounted for 50% of the solid phase. The above raw materials and quartz sand were mixed with CaO / SiO 2 The molar ratio is 0.8 for batching, dissolved in water with a liquid-solid ratio of 30mL / g and fully mixed. Put the slurry into the reaction kettle, raise the temperature to 140°C, and keep it warm for 24 hours for hydrothermal reaction. After the reaction, the slurry is vacuum filtered and fully rinsed; For slag, the wet slag with a water content of about 60% is pressed and formed with a mold under a molding pressure of 14 MPa. After holding the pressure for 30 minutes, it is demolded and dried at 50°C for 15 hours. The bulk density ...

Embodiment 3

[0049] This example uses sub-fused salt dealuminated red mud and dealuminated fly ash as raw materials, which contain 26.09% SiO 2 , 29.14% CaO, 11.15% Na 2 O, 8.11% Fe 2 o 3 , 6.36% TiO 2 The dealuminated red mud accounts for 30% of the solid phase; contains 34.26% SiO 2 , 35.12% CaO, 16.08% Na 2 O sub-molten salt dealuminated fly ash accounted for 70% of the solid phase. The above raw materials were mixed with sodium silicate nonahydrate by CaO / SiO 2 The molar ratio is 1.2 for batching, dissolved in water with a liquid-solid ratio of 25mL / g and fully mixed. Put the slurry into the reaction kettle, raise the temperature to 240°C, and keep it warm for 30 hours for hydrothermal reaction. After the reaction, the slurry is vacuum filtered and fully rinsed; For slag, the wet slag with a water content of about 60% is pressed and formed with a mold under a molding pressure of 7 MPa. After holding the pressure for 5 minutes, it is demolded and dried at 105°C for 7 hours. The ...

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Abstract

The invention provides a preparation method for a xonotlite type heat-preserving material. According to the invention, the xonotlite type heat-preserving material is prepared by utilizing sub-molten salt dealuminized red mud and sub-molten salt dealuminized fly ash as calcareous and siliceous raw materials through a dynamic hydrothermal reaction. The method in the invention solves problems of high cost and high resource consumption due to synthesis of xonotlite from native silicon sources and calcium sources; a novel solution way is provided for emission problems of large quantities of two solid wastes of fly ash and Bayer process red mud; meanwhile, the sub-molten salt dealuminized red mud and fly ash, after drying and crushing, do not need high energy consumption processes like activation and high-temperature treatment, and can directly undergo a thermal reaction; thus, heat-preserving material cost is greatly reduced, and economic benefits are improved; meanwhile, pollutions of two solid wastes to the environment are indirectly solved.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials and recycling of industrial solid wastes, in particular to a method for preparing xonotlite type thermal insulation materials. Background technique [0002] The molecular formula of xonotlite is Ca 6 [Si 6 o 17 ](OH) 2 , The pure product is colorless or white, and it is light rose, light gray and gray due to impurities. It is produced in serpentine and can be used to prepare cement, ceramics, etc., and has excellent temperature resistance. As a new type of inorganic material, xonotlite type thermal insulation material not only has its advantages in thermal insulation performance, but also its low bulk density and high flame retardancy are unmatched by other products. [0003] At present, the preparation of xonotlite type insulation materials is mostly made of siliceous raw materials such as quartz powder, quartz sand, amorphous silicon powder, wollastonite and calcium raw materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00
Inventor 马淑花郭曦尧郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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