Calcining process of synthesizing hollow silica alumina ball

A technology for calcining and synthesizing hollow spheres, applied in the field of refractory materials, can solve problems such as poor fluidity, uneven wall thickness of hollow spheres, and rough surfaces.

Inactive Publication Date: 2007-11-07
平顶山新型耐材股份有限公司
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Problems solved by technology

The production process is to use plastic pellets as the ball core, spray the adhesive on the surface for many times, bond the refractory powder several times, and then dry and calcinate. The hollow balls produced by this process have a particle size of 2 to 16mm, large particle size, rough surface, poor fluidity, high cost
It cannot be used as a raw material for the production of lightweight refractory products, but only as an unshaped refractory material for heat insulation

Method used

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  • Calcining process of synthesizing hollow silica alumina ball

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Embodiment Construction

[0018] As shown in Figure 1, after the sawdust is crushed and processed, water and a binder are added, stirred and kneaded to make a wet ball core, and then the wet ball core containing about 60% to 65% of water is placed in the forming machine. In the ball machine, adjust the rotation speed to 28-32 rpm. While the wet bulb core is turning and rolling, sprinkle the dry powder of silicon-aluminum refractory raw materials. The moisture content of the dry powder of silicon-aluminum series refractory raw materials is not more than 5%. ~ 12 minutes, wrap powder into balls, then dry the balls and calcined at high temperature to make silicon-aluminum hollow balls.

[0019] This process can produce clay hollow balls, high alumina hollow balls, and mullite hollow balls. It not only has high ball forming rate, uniform ball wall, small bulk density, high service temperature, and low thermal conductivity, but also has simple process and low cost. Low, solves the long-standing problem of b...

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Abstract

The calcining process of synthesizing hollow silica-alumina ball includes the steps of crushing sawdust, mixing with water and adhesive, making wet ball kernel, turning the wet ball kernel in ball forming machine in proper rotation speed while throwing proper amount of refractory silica-alumina powder for coating the ball kernel, and calcining at high temperature to produce the hollow silica-alumina ball. The hollow silica-alumina ball has low bulk density, low production cost and other advantages, and is used as the material for producing high grade refractory material. The present invention makes it possible to producing light refractory material with bulk density smaller than 0.6 g/cu cm.

Description

technical field [0001] The invention relates to a method for preparing a refractory and heat-insulating hollow sphere, in particular to a method for calcining and synthesizing a silicon-aluminum hollow sphere. It belongs to the field of refractory materials. Background technique [0002] Silicon-aluminum hollow spheres are the main raw materials for high-grade lightweight refractory products. The market demand is large and the development is fast. However, the current methods for producing hollow spheres are mainly as follows. Because of its high requirements on raw material purity, high energy consumption, high cost, large bulk volume, and low ball forming rate, it can only produce refractory products with a bulk density greater than 1.2 grams per cubic centimeter, which seriously restricts high-grade light-weight refractory products. Material development. The second is the Chinese patent "Novel Refractory and Heat-insulating Hollow Ball and Preparation Method", the paten...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/18C04B35/622
Inventor 杨德清李德周吴德华王芳高永民
Owner 平顶山新型耐材股份有限公司
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