Lime rotary kiln castable

Abstract

The invention discloses lime rotary kiln castable. Wear-resistant and fireproof plastic refractory is adopted, high-strength aluminate cement serves as coagulant, a certain amount of binder and 85% of clinker phosphoric acid are compounded, and a stirring machine is used for stirring the mixture to be uniform. The invention further discloses a pouring method of the castable. The method comprises the steps of welding an anchoring hook to a pre-pouring position in advance; then directly ramming the castable which is stirred and has certain viscosity to the pouring position till the required pouring thickness is reached. By the adoption of the technical scheme, the wear-resistant and fireproof plastic refractory is adopted for pouring, no formwork supporting plate is needed, no free water or crystallization water is separated out in the kiln drying process, and stirring time is short; meanwhile, the wear-resistant plastic refractory is good in thermal shock resistance, low in thermal conductivity and short in natural curing time, and kiln drying can be conducted directly after pouring is ended; the service life is long; construction is convenient and fast; a great amount of kiln-drying fuel gas energy consumption is saved.

Description

technical field [0001] The invention belongs to the technical field of production equipment in the iron and steel industry, and relates to maintenance materials and maintenance techniques thereof. More specifically, the invention relates to a castable for a limestone rotary kiln. Background technique [0002] In order to meet the requirements of iron and steel enterprises for steelmaking and sintering to produce lime, the lime rotary kiln has been in full-load continuous production. The castables of the preheating chamber of the preheater of the rotary kiln, the round sky (that is, the upper part transitions from a circle to the lower part) and the transfer chute are washed by the long-term combination of limestone rolling and high-temperature mixed air flow, and the castables are severely worn. When the thickness wears to a certain extent, the steel plate shells of the preheater and the transfer chute are easily burned and deformed by high-temperature flames and airflow, ca...

AI Technical Summary

Problems solved by technology

After the repair is completed, the kiln is baked according to the kiln curve, which lasts for more than 24 hours, which takes a long time; and when repairing and pouring castables, it is necessary to support the formwork, fully stir with water, and vibrate with vibrating rods during the pouring process. , complex and time-consuming construction

Especially when there is a large amount of white ash used for emergency repair or overhaul sintering production, there is not enough time to dry the kiln. In this way, the water in the castable cannot be completely precipitated, and the quality requirements such as hardness of the castable cannot be guaranteed. It is easy to fall off after a long time, and thus It needs constant repairs, which is time-consuming and labor-intensive, which increases the production cost. From 2013 to October 2014, only the No. 1 kiln transfer chute and the preheater were repaired many times.