Preparation of nanometer granular iron powder

Abstract

The preparation method of nano particle iron powder includes the following steps: using high-energy ball grinding mill to ball-pulverize pure reduced iron powder whose grain size is 100-200 meshes under the protection of argon, adding quenched stainless steel ball or hard alloy ball in steel tank or hard alloy tank is ball grinding mill and adding a certain quantity of auxiliary additive. Said invention adopts mechanical alloying (high-energy ball-grinding) method to obtain the pure iron powder with higher chemical stability, and its particle size is less than or equal to 100 nano.

Description

(1) Technical field [0001] The invention relates to the technical field of mechanical alloying synthetic materials, in particular to a preparation method of nano-particle iron powder. (2) Background technology [0002] Elemental iron powder is the main iron fortifier used in the food industry, accounting for about 50% of the total. It is very important for the treatment of iron deficiency anemia and the improvement of human health. Iron-deficiency anemia is a common nutritional deficiency. At present, about 15-20% of people in the world suffer from iron-deficiency anemia. In my country, infants and primary and middle school students suffer from iron-deficiency anemia as high as 64.4%, of which women account for 47%. The harm of iron deficiency to the human body is mainly manifested as: iron deficiency in children can lead to a decline in development and learning ability, which is equivalent to a decrease in IQ of 5 to 7 points, and increases the absorption of lead, and sever...

AI Technical Summary

Problems solved by technology

In addition to the mechanical alloying method, these methods generally have defects such as harsh reaction conditions, complex reaction equipment (such as high temperature, high pressure, etc.), large equipment investment, complicated preparation process, low output efficiency, and high production cost. Theoretical discussion, the preparation of some metal powders that are difficult to produce by conventional methods or the actual demand is small, it is difficult to realize industrial production

The reaction ball milling process in the mechanical alloying method is complicated, the equipment investment is large, and the production cost is high

The conventional high-energy ball milling method has the advantages of less equipment investment, simple process, and easy industrial production. However, when the method prepares uniform and stable ultrafine particles of pure iron powder, the iron powder is prone to plastic deformation, and cold welding occurs during the ball milling process. The tendency is large, the particles are difficult to disperse, and it is difficult to obtain uniform ultrafine powder, and as the particle size of the powder decreases, the surface area increases, the chemical activity increases, and it is easy to oxidize

Therefore, there are still technical difficulties in preparing uniform and stable nano-particle iron powder by conventional high-energy ball milling.