Light composite baking-free brick for nitrogen kiln and its preparing method

Abstract

The invention discloses a nitrogen kiln using light compounding unburned brick and the manufacture method. It includes working layer, and identity layer. Working layer, which is made up of 40-50% light aggregate, 2-10% silicon fine powder, 44-54% sintering alumina powder, and 0.3-1% paper pulp powder, occupies 1 / 4-1 / 2, and identity layer, which is made up of 40-50% light aggregate, 50-60% sintering alumina powder, 0.3-1% paper pulp power, occupies 1 / 2-3 / 4. When adding material, using clapboard to separate off, adding material into working layer and identity layer, removing the clapboard, taking shaking pressing or machine pressing molding, baking at 150-250 degree centigrade, the product would be gained. The invention would enhance the thermal shock resistance, and high or low temperature combination intensity of light brick.

Description

technical field

[0001] The invention belongs to a light-weight refractory product, and mainly relates to a light-weight composite unfired brick for a nitrogen kiln and a preparation method thereof. Background technique

[0002] Lightweight refractory products are an important part of the kiln. They are used as heat insulation refractory materials in kilns to reduce energy loss. According to the part used in the kiln, lightweight refractory materials can be divided into two types. One type of lightweight refractory material is used for non-working lining, which is located in the middle layer and outer layer of the kiln wall. This type of lightweight refractory material has high aluminum Lightweight bricks, clay lightweight bricks, diatomite bricks, etc.; another lightweight refractory material is directly used as the working lining, that is, the hot brick lining of the kiln wall. Such lightweight refractory materials include mullite lightweight bricks, oxide Aluminum lightwe...