Principle and application of reduced iron powder
Commonly used in the middle school chemistry curriculum of reduction iron powder formula (people's education press higher volume < metals and their compounds >):
3Fe+4H2O (g) = high heat =Fe3O4+4H2
Fe2O3+3CO= high temperature =2Fe+3CO2
Reduced iron powder is popular with solid or gaseous reducing agents (Coke, charcoal, anthracite, water coal gas, into natural gas, synthetic ammonia, hydrogen, and so on) reduction of iron oxides (iron ore, rolled steel scales, etc) to produce spongy iron. The restore process is divided into (solid carbon reduction) once restored and twice restored, a restoration is solid carbon reduction preparation of sponge iron, a restored main processes are: (iron ore, rolled steel scale) magnetic separation → → drying → grinding → sieve canning into a furnace → → → sponge iron. Secondary refining process: sponge iron crushing magnetic separation → → → → cleaning powder reduction furnace II → solutions → crushed → classification of magnetic separation ¡ú screening → → → mix → packaging the finished product. Produces high quality iron powder by reduction methods, the parameters of standard, Fe ≥ 98%, carbon 0.01%, p and s are less than 0.03%, hydrogen damage of 0.1~0.2%. The main use of reduced iron powder: powder metallurgy products reduced iron powder, 60%~80% of the total consumption of reduced iron powder in this industry. Welding electrodes with reduced iron powder, iron powder can be added to the coating 10~70% improved electrode process and significantly improve the deposition efficiency. Reduced iron powder for chemical industry, mainly for chemical catalysts, precious metals restored, additive in alloy and copper replacement, and so on. Iron powder for cutting stainless steel, cutting steel products, iron powder oxy-acetylene flame spray can improve cutting performance, broaden the scope of cutting steel grades, improved cutting thickness. The continuous improvement of technology of powder metallurgy industry in China, being widely used powder metallurgy parts and planes, guns, motorcycles, family car, automobile, agricultural machinery, mining, electric power tools, machine tools, transport and other machinery industry.