Aluminum oxide nascent fiber with low aluminum oxide content, aluminum oxide fiber, preparation method of aluminum oxide fiber, aluminum oxide fiber blanket and preparation method of aluminum oxide fiber blanket

A technology of alumina fiber and alumina, applied in the field of refractory materials, can solve the problems of low fiber tensile strength, short service life, and large power consumption

Active Publication Date: 2021-04-30
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production mostly adopts the sol-gel method to prepare raw fibers, and prepares alumina fibers by high-temperature calcination, so that the content of alumina fibers and fiber blankets is low (the content of slag balls is 70 mesh: <0.5%), and the thermal conductivity Low (the thermal conductivity of the blanket at an average temperature of 500°C <0.12W/(m·K))
However, the main composition of ordinary alumina fibers includes Al 2 o 3 70%~72%, SiO 2 27%~30%, CaO<0.1%, MgO<0.1%, due to the high content of alumina, on the one hand, the cost of raw materials is high, about 200,000 per ton; on the other hand, the crystallization temperature is high, resulting in

Method used

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Examples

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preparation example Construction

[0031] The invention provides a method for preparing alumina fibers with low alumina content, comprising: calcining the above-mentioned primary alumina fibers at high temperature to obtain alumina fibers.

[0032] In the present invention, the high-temperature calcination preferably specifically includes low-temperature treatment, medium-temperature treatment and high-temperature treatment; the temperature of the low-temperature treatment is preferably 0°C-500°C; the time of the low-temperature treatment is preferably 90-180min, more preferably 90 to 150 minutes, preferably 90 to 120 minutes; in the examples provided by the present invention, the time for the low temperature treatment is specifically 90 minutes or 100 minutes; the temperature for the medium temperature treatment is preferably 500°C to 1100°C; the medium temperature treatment The time for the high temperature treatment is preferably 30 to 90 minutes, more preferably 50 to 70 minutes; in the examples provided by ...

Embodiment 1

[0046] Heat aluminum powder, hydrochloric acid and distilled water at a molar ratio of 1.5:1:20 at 90°C for 3 hours to obtain Al 2 o 3 The polyaluminum chloride sol with a content of 15wt% is cooled to room temperature for later use; lactic acid, polyvinyl alcohol, alcohol, and water are mixed and dissolved at room temperature according to a mass ratio of 0.5:5:0.4:100 as additives.

[0047] The above polymeric alumina sol and commercially available silica sol (SiO 2 Content: 10%) according to SiO 2 :Al 2 o 3 = 45:55 mixing, adding 15wt% of the total mass of alumina in the polyaluminum chloride sol and silica in the silica sol to add additives, adding 2wt% of CuO fiber reinforcement and mixing evenly, heating and reacting, in Polymerize at 100°C for 2 hours to obtain alumina colloid; adjust the viscosity of alumina colloid, and the adjusted alumina colloid is 2000cP at 25°C.

[0048] The above-mentioned colloid is formed into fibers by spinning process, the rotation speed...

Embodiment 2

[0052] Heat aluminum powder, hydrochloric acid and distilled water at a molar ratio of 1.7:1:35 to reflux at 80°C for 5 hours to obtain Al 2 o 3 The polyaluminum chloride sol with a content of 15wt% is cooled to room temperature for later use; lactic acid, polyvinyl alcohol, alcohol, and water are mixed and dissolved at room temperature according to a mass ratio of 0.8:6:0.6:120 as additives.

[0053] The above polymeric alumina sol and commercially available silica sol (SiO 2 Content: 15%) according to SiO 2 :Al 2 o 3 = 40:60 mixing, adding 7wt% of the total mass of alumina in the polyaluminum chloride sol and silica in the silica sol to add additives, adding 4wt% of PbO fiber reinforcement and mixing evenly, heating and reacting, in Polymerize at 80°C for 4 hours to obtain alumina colloid; adjust the viscosity of alumina colloid, and the adjusted alumina colloid is 2200cP at 25°C.

[0054] The above-mentioned colloid is formed into fibers by spinning process, the spinni...

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Abstract

The invention provides an aluminum oxide nascent fiber with low aluminum oxide content. The aluminum oxide nascent fiber is obtained by carrying out fiber forming and cotton collecting treatment on aluminum oxide colloid, wherein the aluminum oxide colloid is obtained by reacting polymerized aluminum oxide sol, silica sol, an additive and a fiber reinforcing agent, the additive comprises lactic acid, polyvinyl alcohol, ethanol and water, and the fiber reinforcing agent is selected from copper oxide and/or lead oxide. Compared with the prior art, the fiber reinforcing agent is added in the preparation of the aluminum oxide colloid, so that colloid gelatinization is facilitated, the fiber toughness is improved, the tensile strength meets the requirements, the content of aluminum oxide is reduced, the production cost is reduced, and meanwhile, the obtained aluminum oxide fiber has relatively low slag ball content and relatively good heat insulation performance; and the tensile strength of the fiber is improved, so that the application field is wide.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an alumina primary fiber with a low alumina content, an alumina fiber and a preparation method thereof, an alumina fiber blanket with a low alumina content and a preparation method thereof. Background technique [0002] Ordinary ceramic fiber, as a fibrous lightweight refractory material, is widely used in industrial furnaces in metallurgy, petrochemical, electric power, building materials, non-ferrous metals and other industries. It is an energy-saving and thermal insulation material with excellent performance. The main components of ordinary ceramic fibers include: Al 2 o 3 40%~50%, SiO 2 45%~55%, CaO<0.1%, MgO<0.1%. However, since the production process of ceramic fibers is mostly produced by spinning or blowing, the fibers are formed by compressed gas or mechanical force, resulting in defects on the surface, uneven thickness, and high slag ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622D01F9/08D04H1/4209D04H1/46D04H3/002D04H3/105
CPCC04B35/10C04B35/62236D01F9/08D04H1/4209D04H1/46D04H3/002D04H3/105C04B2235/3418C04B2235/3281C04B2235/3296C04B2235/9607C04B2235/96
Inventor 王成龙李梅岳耀辉鹿明
Owner 山东鲁阳浩特高技术纤维有限公司
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