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Reduction of iron powder production process and production methods

Reduction of iron powder is used in the production of powder metallurgy iron-based products of iron powder, the quality indicators generally include: chemical composition, such as iron, carbon, oxygen, sulfur, phosphorus and other acid insoluble content, oxygen content can be hydrogen Physical properties, such as sieving particle size composition, bulk density, fluidity, compressibility and sintered dimensional stability, and the like. As for the manufacture of high-density, high-strength mechanical parts of the use of Jinxin iron powder oxygen content and compressibility (iron powder under a certain pressure can be achieved after the compact density) indicators have strict requirements. Reduction method and atomization method have been able to produce low oxygen content and high compressibility of high quality reduced iron powder.
The production of reduced iron powder is the use of gas or solid fuel (such as ammonia decomposition gas, H2, CO, solid carbon, or gas and solid fuel) as a reducing agent, the iron oxide (such as iron ore concentrate, Rolling iron and steel scales, pyrite, ferrous sulfate, ferrous chloride, oxygen converter steelmaking furnace ash) in a solid state to reduce the degree of a high degree of metallization of iron products of the process, the total iron content of more than 98.5% Above, C content of 0.01%, P, S content is very low.
Reduction of iron powder is the use of solid or gas reducing agent (coke, charcoal, anthracite, water gas, natural gas, decomposition of ammonia, hydrogen, etc.) reduction of iron oxides (iron concentrate, rolling scales, etc.) to prepare sponge iron.

Reduction process is divided into (solid carbon reduction) a reduction and secondary reduction, a reduction is solid carbon reduction preparation sponge iron, a reduction of the main process is: (iron concentrate, rolling scales, etc.) → drying → magnetic → crushing → screening → canning → into a reduction furnace → sponge iron.

Reduction of iron powder production process and production methods

Secondary fine reduction process: sponge iron → clear → broken → magnetic separation → secondary reduction furnace → powder → broken → magnetic separation → screening → classification → mixing → packaging → finished products.
With the reduction of the production of high-quality iron powder, the parameters of the standard, Fe ≥ 98%, carbon ≤ 0.01%, phosphorus and sulfur are less than 0.03%, hydrogen loss of 0.1 ~ 0.2%.
The main purpose of the reduction of iron powder are: powder metallurgy products to restore iron powder, the industry consumption of reducing the total amount of iron powder 60% to 80%.
Welding electrode with reduced iron powder, in the skin by adding 10 ~ 70% iron powder can improve the welding process and significantly improve the welding efficiency.
Chemical reduction of iron powder, mainly used for chemical catalysts, precious metals reduction, alloy addition, copper replacement and so on. Cutting stainless steel iron powder, cutting steel products, oxygen - acetylene flame in the injection of iron powder, can improve the cutting performance, expand the scope of cutting steel to improve the cutting thickness.

China's powder metallurgy industry technology continues to improve, the current powder metallurgy parts are widely used with aircraft, motorcycles, family cars, cars, agricultural machinery, mining, power tools, machine tools, transportation and other machinery industry.
The material is mainly ultra-pure magnet concentrate powder, low-carbon roll rolling steel scales. 80% to 90% of foreign reduced iron powder are pure iron concentrate powder for the production of materials. According to the 2003 material statistics, in 2002 the total output of domestic iron powder reached 10.16 million tons, an increase of 35% over 2001, which is the first time China's iron powder exceeded 100,000 tons. And iron ore powder for the production of recycled iron powder to achieve the 1.104 million tons to rolling steel scales for the material has 7.035 million tons.
In the iron scale as the material of the reduction of iron production process, the requirements of the material scale scales are very severe, as long as the low-carbon rolling rolling steel scales can be used to restore the production of iron powder. However, with the rapid development of the iron and steel industry, many of these scales were reused by the metallurgical industry, resulting in narrow source of its source, the price rise, resulting in a lot of subtle scale flood shopping malls, which fundamentally affected the recovery of iron chemical composition , Physical, metallurgical function. So it is difficult to use high-volume production of stable quality, high-grade powder metallurgy recovery of iron powder, thus, the recovery of the production of iron powder material capital into the domestic steel powder metallurgy workers waiting to solve one of the questions.