Special castable for small rotary kiln preheater

Abstract

The invention provides a special castable for a small rotary kiln preheater, which has high temperature resistance, high abrasion resistance and high alkali erosion resistance in order to overcome the shortcomings of the prior art. The invention also provides a preparation method of the castable. The castable is characterized by comprising the following components in percentage by weight: 15-23 percent of rankinite, 1 percent of Taiyuan purple waste rock, 15-19 percent of silicon carbide, 28-30 percent of chrome-iron slag, 6-10 percent of zinc ferrite, 7-8 percent of magnesium-zirconium olivine, 1-3 percent of potassium magnesium titanate, 1-2 percent of aluminium zirconium nitride, 3-5 percent of clinoenstatite, 5-6 percent of microsilica powder, 2-3 percent of zirconium calcium aluminate, and 3-5 percent of high alumina cement, and adding 0.5 percent of Ti3SiC2, 0.1 percent of methally alcohol polyoxyethylene ether, 0.05 percent of isopentenyl alcohol polyoxyethylene ether, 0.1 percent of aluminum potassium sulphate dodecahydrate, and 0.05 percent of chromium potassium sulfate dodecahydrate.

Description

Technical field [0001] The invention belongs to the field of refractories, and specifically relates to a special caustic-resistant castable for a rotary kiln preheater and a preparation method thereof. Background technique [0002] The new dry-process cement rotary kiln production line has the advantages of high yield, high efficiency, low consumption, and environmental protection, making its current market share of more than 98%, almost replacing the traditional wet-process cement production line, but the new dry-process cement kiln has been After the use of the kiln, the content of corrosive substances such as alkali and sulfur in the kiln is dozens of times that of the wet cement production line, and the corrosive substances such as alkali and sulfur are in the kiln during use. It will continue to circulate enrichment, which will severely erode the castables of the first to fifth stages of the preheater. After the castable is corroded by alkali, sulfur and other components, it...

AI Technical Summary

Problems solved by technology

[0002] The new dry-process cement rotary kiln production line has the advantages of high output, high efficiency, low consumption, and environmental protection, making its current market share as high as 98%, almost replacing the traditional wet-process cement production line. However, the new dry-process cement kiln has undergone a long-term After use, the content of corrosive substances such as alkali and sulfur enriched in the kiln is dozens of times that of the wet-process cement production line, and the corrosive substances such as alkali and sulfur are in the kiln during use. It will also continue to circulate and enrich, seriously eroding the castables in the first to fifth stages of the preheater. After the castables are eroded by alkali, sulfur and other components, alkali cracks will appear on the refractory castables, resulting in the current new dry process. The service life of refractory castables on cement kilns is shortened. The current remedy method is to repair the eroded parts or directly replace refractory castables. Due to frequent repairs and replacements, the normal operation of dry process cement kilns is seriously affected, reducing the Productivity