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

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 ...

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 the need for heat treatment High temperature and high power consumption lead to high production cost of alumina and high market price

If the alumina content is reduced, the tensile strength of the fiber will be low, and the finished alumina fiber and alumina fiber blanket will be easily pulverized in a long-term high-temperature environment, and the service life will be short

[0004] With the widespread use of refractory fibers, some industries need some refractory materials with low slag content and low cost. Ordinary ceramic fibers cannot meet customer needs because of high slag content; and alumina fiber has low slag content but its price High, make customers discouraged