How to choose a high-quality ferrosilicon 75？

First, let's look at what silicon ethnosis is:
Introduction to Ferro Silicon : It is an iron alloy of iron and silicon. Ferro Silicon is an iron-silicon alloy made from coke, steel chips, quartz (or silica) and smelted by an electric furnace.
Because silicon and oxygen are easy to synthesize silicon dioxide, Ferro silicon is often used as deoxygenator when making steel;
Ferro Silicon use:
1, 75 silicon iron in the steel making industry as deoxygenator and alloy agent.
In order to obtain the chemical composition of qualified steel and ensure the quality of steel, in the final stage of steelmaking must be deoxygenated, silicon and oxygen between the chemical affinity is very large, so silicon iron is a strong deoxygenator for precipitation and diffusion deoxygenation.
2, 75 silicon iron in the cast iron industry as a incubator and globulizer.
Cast iron is an important metal material in modern industry, it is cheaper than steel, easy to melt and smelt, with excellent casting performance and much better resistance than steel. In particular, ball-ink cast iron, its mechanical properties to achieve or close to the mechanical properties of steel.
Adding a certain amount of ferro silicon in cast iron can prevent the formation of carbonicide in iron, promote graphite precipitation and globulification, so in the production of spherical cast iron, silicon iron is an important incubator (to help analyze graphite) and globulin. Among these uses, the steelmaking, foundry and ferroalloy industries are the largest users of silicon iron. Together, they consume more than 90% of the silicon iron.
Among the different grades of ferro silicon , the most widely used is ferro silicon 75.
In the steelmaking industry, approximately 3-5kg ferro silicon 75 is consumed for every 1t steel produced.
The specific use of silicon iron we all understand it, it seems that silicon iron for steelmaking and casting is really too important, next we look at how to choose a high-quality ferro silicon 75.
1, from the raw materials to see the quality of ferro silicon 75 good or bad; Siliconstone is the most basic raw material for the production of silicon iron, so the quality of silica also determines the quality of ferro silicon 75, so how to judge the quality of silica?
Silicone often produces an element of aluminum trioxide when smelting, which not only affects the slag problem when steelmaking, but also makes the aluminum element in silicon iron improve greatly affect the quality of silicon iron.
2. The content of calcium oxide and magnesium oxide affects the quality of ferrosilicon 75.
Usually the content of calcium oxide and magnesium oxide in silicon iron should be less than 1%, if greater than this range will increase the smelting slag amount when used in steelmaking, and erosion of the iron outlet greatly affects the quality of ferro silicon 75.
3. the particle size of silica is also a factor affecting the quality of ferosilicon 75.