Novel silicon carbide and boron carbide ceramic inner barrel suspending plate for dry method cement kiln

Abstract

The invention discloses a novel silicon carbide and boron carbide ceramic inner barrel suspending plate for a dry method cement kiln, which has the advantages of long service life, high temperature resistance, oxidation resistance, high strength at high temperatures, good wear resistance, small influence by acid and alkali atmospheres and the like. Silicon carbide, boron carbide and metallic silicon are used as raw materials, additives are additionally added, the addition quantity of the silicon carbide accounts for 75-95% of the total weight of the raw materials, the addition quantity of themetallic silicon accounts for 1-20% of the total weight of the raw materials, the addition quantity of the boron carbide accounts for 0.1-15% of the total weight of the raw materials, and the addition quantity of the additives accounts for 0.1-10% of the total weight of the raw materials. After being processed by grouting molding or extrusion molding and demoulding drying, the mixture is put in avacuum high-temperature kiln to be sintered, and a sintered product can be made after sintered.

Description

Technical field [0001] The invention relates to a ceramic inner cylinder hanging plate for a new type of dry process cement kiln preheater, in particular to a ceramic inner cylinder hanging plate whose main components include silicon carbide and boron carbide. Background technique [0002] The preheater is one of the core equipment of the new dry cement production process, which is responsible for material heating, gas-solid separation, material transportation and some physical and chemical reactions. Among them, the cyclone inner cylinder is the key component of the preheater. If there is no inner cylinder, the material separation efficiency will be reduced by 10%, and the heat consumption will increase by about 20kJ / kg clinker. The waste heat of a 5000t / d dry process line will be as much as 1000-2000 tons of standard coal each year; What is important is that the waste of standard coal due to pipe blockage, thermal efficiency reduction and even shutdown due to the absence of inn...

AI Technical Summary

Problems solved by technology

At present, the hanging plate of the inner tube of the preheater is still mainly made of nickel-chromium alloy heat-resistant steel. Since the heat-resistant steel has poor corrosion resistance to acid and alkali atmospheres and is not resistant to high-temperature wear, the hanging plate of the inner tube of the heat-resistant steel The service life is very short, only about 10 months to a year

In particular, chromium in alloy steel contains harmful components, which pollutes the environment, and its use is restricted both at home and abroad.