Method for preparing lightweight calcium hexaaluminate at low temperature

A light-weight calcium hexaaluminate technology, which is applied in the field of low-temperature preparation of light calcium hexaaluminate, can solve the problems of endangering the health of workers and the environment, hindering the popularization of calcium hexaaluminate, volatile corrosion or pollution of the furnace body, etc. , to achieve the effect of simple process, easy operation and lower sintering temperature

Active Publication Date: 2014-02-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrofusion method is characterized by a simple process, and the obtained material has a high density and good mechanical properties, but the disadvantage is that it requires high cooling conditions, and it is difficult to realize industrialization
The characteristic of the molten salt method is that it can significantly reduce the synthesis temperature and shorten the reaction time, and improve the synthesis efficiency, but the uniformity of the synthesized material is difficult to control, and many molten salts have varying degrees of toxicity, which endanger the health of workers and the environment. Its volatiles often corrode or pollute the furnace body
The above-mentioned preparation methods of calcium hexaaluminate each have their own shortcomings and deficiencies, which hinder the popularization and use of calcium hexaaluminate. Based on the demand for calcium hexaaluminate in industrial kilns, a low-temperature preparation of light calcium hexaaluminate is studied. method has great practical significance

Method used

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  • Method for preparing lightweight calcium hexaaluminate at low temperature
  • Method for preparing lightweight calcium hexaaluminate at low temperature
  • Method for preparing lightweight calcium hexaaluminate at low temperature

Examples

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Embodiment 1

[0027] A method for preparing light calcium hexaaluminate at low temperature, according to CaO, Al 2 o 3 The molar ratio is 1:6 to weigh calcium hydroxide and aluminum hydroxide, the water consumption is 55 times that of calcium hydroxide, the consumption of glycerol and triethanolamine are respectively 25% and 10% of the water consumption, and the consumption of sodium hydroxide is hydrogen 2.6% of the amount of alumina. After mixing the raw materials evenly, place them in an autoclave at 150°C for 12 hours. After cooling, the solid-liquid separation is formed into balls. After drying, they are calcined in a high-temperature furnace at 1400°C for 3 hours, and then cooled to room temperature with the furnace to obtain the product. The apparent density of the product is 1290 Kg / m 3 , bulk density is 640 Kg / m 3 .

Embodiment 2

[0029] A method for preparing light calcium hexaaluminate at low temperature, according to CaO, Al 2 o 3 The molar ratio is 1:8 to weigh calcium hydroxide and aluminum hydroxide, the water consumption is 55 times that of calcium hydroxide, the consumption of glycerol and triethanolamine are respectively 25% and 10% of the water consumption, and the consumption of sodium hydroxide is hydrogen 0% of the amount of alumina used. After mixing the raw materials evenly, place them in an autoclave at 150°C for 12 hours. After cooling, the solid-liquid separation is formed into balls. After drying, they are calcined in a high-temperature furnace at 1400°C for 3 hours, and then cooled to room temperature with the furnace to obtain the product. The apparent density of the product is 1260 Kg / m 3 , bulk density is 680 Kg / m 3 .

Embodiment 3

[0031] A method for preparing light calcium hexaaluminate at low temperature, according to CaO, Al 2 o 3 The molar ratio is 1:8 to weigh calcium hydroxide and aluminum hydroxide, the water consumption is 55 times that of calcium hydroxide, the consumption of glycerol and triethanolamine are respectively 10% and 10% of the water consumption, and the consumption of sodium hydroxide is hydrogen 0% of the amount of alumina used. After mixing the raw materials evenly, place them in an autoclave at 150°C for 12 hours. After cooling, the solid-liquid separation is formed into balls. After drying, they are calcined in a high-temperature furnace at 1400°C for 3 hours, and then cooled to room temperature with the furnace to obtain the product. The apparent density of the product is 1250 Kg / m 3 , bulk density is 670 Kg / m 3 .

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Abstract

The invention discloses a method for preparing lightweight calcium hexaaluminate at a low temperature. The method is characterized in that the method comprises the following steps: uniformly mixing raw materials comprising a calcium raw material, an aluminum raw material, water, alcohol, amine and an alkali to obtain a mixture, placing the mixture in an autoclave, and carrying out a hydrothermal reaction at a temperature of 120-200DEG C for 5-15h to prepare a precursor; cooling the precursor to room temperature, carrying out solid-liquid separation, and drying the obtained solid at a temperature of 80-120DEG C for 2-8h to obtain a dried solid; and placing the dried solid in a high temperature furnace, calcining at a temperature of 1300-1400DEG C for 1-5h, and cooling with the furnace to room temperature to prepare lightweight calcium hexaaluminate. The sintering temperature of the method is above 150DEG C lower than that of a present technology, the phase of the prepared lightweight calcium hexaaluminate is based on calcium hexaaluminate and also comprises a corundum phase, and the prepared lightweight calcium hexaaluminate can satisfy high-performance industrial kiln requirements of performances comprising the refractoriness, the high volume stability, the slag erosion resistance, the heat insulation performance and the like of calcium hexaaluminate.

Description

technical field [0001] The invention belongs to the preparation of refractory materials containing aluminum and calcium, and relates to a method for preparing light calcium hexaaluminate at low temperature. The calcium hexaaluminate prepared by the invention is especially suitable for refractory materials and has good thermal insulation effect. Background technique [0002] With the shortage of energy, the thermal insulation of industrial furnaces is particularly important. In recent years, the use of refractory materials with light weight and thermal insulation characteristics has increased rapidly. The thermal insulation linings used in traditional industrial kilns are usually fiber linings or lightweight castables (lightweight bricks), all of which have some shortcomings, such as pulverization of fibers, residual line shrinkage of castables, and poor heat insulation effect at high temperatures. Good and so on. [0003] Calcium hexaaluminate (CaAl 12 o 19 or CaO·6Al ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16
Inventor 严云唐梅杨林胡志华石健
Owner SOUTHWEAT UNIV OF SCI & TECH
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