Production process for manufacturing reduced iron powder with steel ball grinding iron cement

Abstract

The invention discloses a production process for producing reduced iron powder by grinding iron mud with steel balls. The reduced iron powder produced by the process has high purity and reliable performance, and is suitable for raw materials such as powder metallurgy and wear-resistant structural parts. The process uses steel balls Grinding iron sludge (which belongs to industrial fixed hazardous waste) directly produces reduced iron powder. The process is simple and the production cost is low. It is an environmental protection project for resource reuse. It includes the following steps: cleaning→magnetic separation→drying→distillation→crushing→coarse screening→reduction (preheating, reduction, cooling)→crushing and screening→packaging in batches. The reduction process adopts 3-stage treatment technology, which is divided into preheating section, reduction section and cooling section. The cooling section is divided into air-cooling section and water-cooling section. The dry decomposed ammonia atmosphere is used to enter the air from the air inlet of the cooling section and the wet decomposed ammonia atmosphere Intake air from the front section of the preheating section. The reduced iron powder produced by the invention is tested by the experimental center, and the iron content exceeds 98%. The powder metallurgy parts made of the reduced iron powder produced by the invention have a density of about 7.1 g / cm3.

Description

technical field [0001] The invention relates to the technical field of reutilization of manufacturing resources of bearing rolling bodies, in particular to a production process for producing reduced iron powder by grinding iron mud with steel balls. Background technique [0002] While the bearing rolling element industry provides important basic parts for the country's high-end manufacturing industry, it also produces a large amount of solid hazardous waste - oily grinding iron sludge, resulting in a serious waste of resources, and resources have become a source of pollution; while the powder metallurgy industry is also It is costing huge sums of money, a lot of energy and pure raw materials to manufacture iron powder. If the steel ball grinding iron sludge is recycled and reprocessed, it can be transformed into low-cost, high-performance iron powder. It will bring huge economic benefits to my country's bearing industry and powder metallurgy industry in terms of environment...

AI Technical Summary

Problems solved by technology

[0002] While the bearing rolling element industry provides important basic parts for the country's high-end manufacturing industry, it also produces a large amount of solid hazardous waste - oily grinding iron sludge, resulting in a serious waste of resources, and resources have become a source of pollution; while the powder metallurgy industry is also Manufacture of iron powder at the cost of huge sums of money, energy and pure raw materials