Mullite silicon corundum abrasive brick special for lime kiln and preparation method

Abstract

Disclosed are a mullite silicon corundum abrasive brick special for lime kiln and a preparation method. The material formula of the mullite silicon corundum abrasive brick special for the lime kiln comprises (1) alumina clinker, (2) alumina clinker, (3) alumina clinker, (4) alumina clinker, aluminium hydroxide gel, white corundum, carborundum and mullite. The preparation method comprises the steps of weighing and taking raw materials according to the proportion, adding the raw materials to a forced mixer, manufacturing the raw materials into mixing materials, manufacturing the manufactured mixed materials into blanks through a pressure brick manufacturing machine, placing the manufactured blanks in a low-temperature furnace, carrying out calcination and moulding to the blanks at low temperature of 550-600 DEG C, and a finished brick can be obtained. Through application of the brick as an inner lining brick on vertical lime kiln, during a process that the mullite silicon corundum abrasive brick is sintered, a silica enamel layer is formed on a fire face surface layer in a clinkering mode by the abrasive brick, abrasion-resisting property of the overall inner lining is improved, and service life of the lime kiln is obviously prolonged.

Description

Technical field [0001] The invention relates to the field of refractory bricks for masonry industrial kilns, in particular to a mosilic corundum wear-resistant brick special for masonry lime kilns and a preparation method. Background technique [0002] Active lime is mainly used in the iron and steel smelting industry. With the increase in steel output, the amount of active lime is increasing. In the prior art, kilns used for calcination of active lime mainly include vertical kilns and rotary kilns. The lining bricks of vertical kiln and rotary kiln are ordinary high-alumina refractory bricks. The strength of this refractory brick is only 40-45mPa, the wear resistance coefficient is ≥6.2, and the service life is only 3-6 months, and the cost is high. In addition, when such refractory bricks are used as the lining of vertical kilns and rotary kilns, the fired active lime contains P, which reduces the quality of steel. Summary of the invention [0003] The purpose of the present i...

AI Technical Summary

Problems solved by technology

The lining bricks of masonry shaft kilns and rotary kilns are ordinary high-alumina refractory bricks. The strength of this kind of refractory bricks is only 40-45mPa, and the wear resistance coefficient is ≥ 6.2. The service life is only 3-6 months, and the cost is high.

In addition, when this kind of refractory brick is used as the inner lining of shaft kiln and rotary kiln, the fired active lime contains P, which reduces the quality of steel