One of the main sectors of the economy is metallurgy.It provides the raw material, many other industries.Ferrous and nonferrous metals are needed almost everywhere.And the prices for these raw materials are growing every day.Energy prices, of course, have a significant effect on the price of steel products.But an important role in the formation of prices also played waste.
A lot of them especially metallurgy.They occupy large areas and thus pollute the air with toxic compounds, water and soil.And at the same time the cost of their accommodation, storage and transportation significantly affect the cost of production of metallurgical enterprises.However, these foods contain a lot of valuable items that can be used as secondary raw materials.And the master's approach, such metallurgical wastes can be converted into a source of income.
These wastes result from the smelting of steel, iron and ferroalloys.And mineral content of different components, which may include iron, they may be even higher than in the same natural ores.And due to insufficient study of the structure and properties of the sludge is a problem with their reuse.
Take, steelmaking slag.These recyclable waste production at many factories and steel mills turned into enriched slag.For this purpose the "dry" magnetic separation of products obtained after crushing slag.A useful product obtained after this treatment, blood oranges considered larger metal and metal aggregates and silica glass.The iron-rich slag in the composition of relatively few.As a result of enrichment at sinter plants from tons of slag receive about 40 kg of metal.Other waste products, which contain only small specks or iron oxide is fed into the blade.
But there is a more efficient technology for the enrichment of steelmaking slag.With the help of these wastes can be produced three products.The first is a metal product.It would be about 10% of the total weight of the slag.It is, besides the metallic iron contains minor impurities glass, silicates and carbonates.His briquetted and sent to a secondary smelter.The second is a lime-iron oxide product.It is about 22% of the total.Iron in this product a bit.For the most part, it consists of various minerals.This wustite, magnetite, maghemit, goethite, hematite, hydrated lime, iron and calcium carbonates, as well as magnesium and calcium ferrites.This product can be used as a high quality feed material in the production of iron sinter fluxed.And the rest, which is about 68%, accounted for the silicate product.Its main part consists of minerals: silicates, spinel, tridymite, silicate glass products and hydration of lime.These waste products also are not in vain.Suitable silicate product mainly in construction and for the production of cement or other cementitious products.
can also take toxins ferromanganese production, which contain many valuable components.It kinglets ferromanganese and metallic iron, silicates, hydroxides, oxides units, carbonate manganese and iron silicate glass products and its crystallization.Scientists have developed a method by which carried dry gravity concentration of toxins.As a result of these waste products make it possible to obtain three products.
first is the iron-manganese concentrate.From the whole mass of slag it can get up to 17%.This product contains magnetic and non-magnetic parts of iron, manganese, Cohen, iron and various alloys with varying contents of manganese and iron, and their oxides and hydroxides.Use this product can be for the production of ferromanganese.
The second product is a silicate sand.Half of the total weight of the slag falls on it.Silicate Sand consists mainly of quartz, cristobalite, tridymite, glass and silicates.Because it is possible to produce silicomanganese or use it as a building material.
The remaining 33% comes from the clay-carbonate dust.It is composed of finely divided silicates, carbonates, glass and other minerals.The powder used for the production of cement.There are many more of this type of waste that can benefit people.
