Preparation of raw materials of rare earth ferrosilicon alloy by silicon thermal reduction method

Preparation of a silicon thermal reduction of rare earth iron alloy of silicon feedstock can be divided into three categories, i.e. rare earth raw materials, reducing agent and flux.

First, the rare earth raw material silicon thermal reduction method to obtain rare earth ferrosilicon alloy rare earth raw materials have a variety of, China is more commonly used in the Baiyun Ebo rich rare earth iron ore blast furnace iron slag (referred to as "rare earth rich slag", the same below), rare earth fine Mine iron slag (referred to as "rare earth concentrate slag", the same below), rare earth oxides (mixed rare earth oxides or single rare earth oxides), rare earth hydroxides and rare earth carbonates. The latter is used only when it is of special need because of its high cost. The former Soviet Union and the United States use rare earth oxides, rare earth hydroxides, and rare earth concentrate pellets and briquettes as raw materials according to their respective resources.

In the blast furnace smelting process, whether it is raw ore or artificial rich ore into the furnace, the rare earth will be transferred to the slag, producing so-called rare earth rich slag. Rare earth rich slag was the main raw material for smelting rare earth ferrosilicon alloy before the 1980s. With the development of mineral processing technology , the medium and high grade rare earth concentrates are separated from the ore. The iron content is very low and does not need to enter the blast furnace for treatment. Therefore, since the 1980s, the rare earth rich slag is no longer produced. 1980s and to develop a rare earth concentrate prepared by electric iron and phosphorus removal more rare rare earth-containing fine slag, slag as the main raw material fine rare earth rare earth ferrosilicon alloy production. In recent years, the production of mainly used Baotou rare earth concentrate, Shandong Weishan Lake rare earth concentrate, Sichuan Suining fluorocarbon antimony ore, through a simple agglomeration treatment, directly into the furnace smelting rare earth ferrosilicon alloy.

Second, the reducing agent Because 75 ferrosilicon has a high silicon content and low impurities, the smelting rare earth ferrosilicon alloy uses 75 ferrosilicon as a reducing agent, which is more economical and reasonable.

3. Flux The flux used in the smelting of rare earth ferrosilicon alloy is mainly lime. The higher the CaO content in lime, the better, and the lower the SiO ₂ and other impurities, the better. In production, lime is generally required to contain CaO > 85% and SiO ₂ < 5%.

Sheet Metal Stamping

A sheet metal stamping operation is one in which sheet metal is cut and formed into a desired shape or profile. Although a sheet metal stamping process may utilize numerous types of special machines, three basic items are essential: the sheet metal from which the part is to be made; the stamping press; and the stamping die.

With the exception of a specialized sheet metal stamping process commonly referred to as hot stamping, most sheet metal stamping operations involve cold forming. This essentially means that no heat is intentionally introduced into the die or the sheet material. However, keep in mind that although stamping is a cold-forming process, heat is generated. Cutting or forming sheet metal creates friction between the die and the metal-much like the friction and heat that occur when you rub your hands together.