Details
DOLOMITE POWDER
1) Producing refractory bricks
• Dolomite is sintered until all CO2 is released and complete recrystallization of oxides to obtain the sintered dolomite. Sintered dolomite is black, tightly, weight 3.3 tons/m3. Bringing this product to water, the MgO and CaO were hydrogenated and dissolved into powder. People use this powder to patch the furnace or mix with 10 - 15% pitch to produce compaction materials to compact the bottom of the furnace.
• From a mixture of magnesite - dolomite (containing 30-50% dolomite), it is made of martensite, a self-adhesive powder.
• Dolomite bricks and beton chromomololite bricks have high fire resistance, so they are used for lining electric furnace and rolling steel furnaces. It requires dolomite to be good at fire resistance in the sintered state, which is not decomposed into the mixture of silicate and alumosilicat Mg, Ca, Fe, Mn which are easily melting and corrosive.
• In fact, dolomite mixed with 2 - 3% SiO2 and 2-5% Al2O3 + Fe2O3 + MnO2 are easier to sinter, for clinker to withstand temperatures up to 1,750 - 1,7600 and very good to withstand slag. On the other hand, it is also found that dolomite contains 1 - 6% SiO2, which is not only harmful but also anti-hydrogenated product. However, if the content of silicon oxide is too high, the compound 2CaO.SiO2 will appear, which will cause the sintered dolomite to easily dust, emit fumes, and waste rapidly.
• Fe, Al, Ti, and Mn oxides all appear to be beneficial because they greatly improve sintering and reduce the ability to hydrate the sintered dolomite powder. However, if the amount of these compounds is too high, a large amount of braunmilerite and aluminate 3 calcium will result in sintered dolomite powder reducing the fire resistance.
• The presence of free CaO will make the product more resistant to fire, but on the other hand CaO is very sensitive with CO2 of the air as well as reacting with Al, Fe to create fusible compounds.
2) In ferrous metallurgy
• Using dolomite as a fluxing aid, burning slag and making magnesium sinter quarry.
• Dolomite used as a fluxing aid in metallurgy has the following standards: MgO> 17-19%, SiO2 <6%, R2O3 + MnO <5%, without S, P, particle size <25mm below 8%,, instant compression resistance> 300 kg/cm2.
• Dolomite used in sintering of metallurgical magnesium should meet the following requirements: CaO + MgO> 53%, MgO> 16%, insoluble sediment <2.5%, clay <3%, particle size 5 - 75mm accounting for 80 %.
3) Producing magnesium metal
• From dolomite, metal Mg is obtained by silicon thermal or electrolysis.
• Require dolomite material size 20 - 300mm.
• MgO> 19.5%, SiO2 + Al2O3 + Fe2O3 + Mn3O4 <2> 5%, Na2 O + K2O <0.2%
4) Production of binders
• Burning dolomite in lump size of 100 - 150mm at 700 - 800oC in a combustion chamber, obtaining "caustic dolomite". Putting this material with chloride solution will get the binder of manhesium used in construction and production of ceramic bricks. The quality requirements for dolomite to produce caustic dolomite are as follows:
MgO> 19%, insoluble residue <5%, R2O3 <4%.
5) Production of soundproofing and heat-proof materials
• Xovelite is an insulating material made of "white magnesium" and 15% atbet. White magnesium is produced from dolomite containing over 19% MgO and less impurities.
6) Dolomite is used for industrial construction, houses and roads
Use in the form of macadam, rubble, boulders. Dolomite shavings are used as fillers for the ketones, for spreading railway foundations.
7) Glass industry
In glass mixing material, dolomite accounts for 10-20%. Glass industry requires dolomite with MgO quality> 19%, CaO <29%, Al2O3 <0.5%, insoluble residue <4%, Fe2O3 <0.05%.
8) Producing grinding powder
• From raw dolomite and sintered dolomite, they created a type of powder is used to polish glass, polish metal and mother of pearl. To make grinding powder, dolomite requires purity, does not contain more than 2% insoluble residue.
9) In chemical and pharmaceutical industry
Dolomite is required to be very clean, containing a lot of MgO, less clay and other impurities
10) In the nitrogen fertilizer industry
• Use dolomite as an anti-stick agent for fertilizers made from ammonium nitrite (NH4, NO3).
• Dolomite must have quality: 19 - 20% MgO, 32 - 33% CaO, SiO2 <2.5%, R2O3 <1.5%.
11) In the rubber manufacturing industry
Dolomite make rubber more solid and accelerate the vulcania process.
12) In cellulosic paper industry, in tanning industry, in ceramic and lacquer industries
• Use dolomite as a raw or sintered powder. The ceramic industry uses clean dolomite to make glazed porcelain enamel materials to make the glaze more even and more shiny.
13) Use of dolomite in agriculture
• Along with limestone, dolomite is used to produce dry sulfur lime which kills poisonous fungi and insects, neutralizing acids for soil to fertilize fields and improve the environment, mainly to neutralize soil acids.
• In addition, fine powdered dolomite applied to rubber trees enhances the thickness of leaves and increases latex yield.
• Raw materials for fertilizer production, soil improvement, biochemical environment stabilization.
• Overcome alum contamination providing calcium and magnesium.
• Stimulating Chaetoceros, Skeletonema algae to develop as feed for shrimp and create stable water color.
• Increasing alkalinity
• Improving pond bottoms, creating an appropriate environment for beneficial microorganisms to develop.
• Add calcium and stimulate shrimp molting simultaneously.
• Overcoming the phenomenon of shrimp floating head
14) Use dolomite in environmental treatment
Dolomite is a mixed carbonate mineral of calcium and magnesium with stable chemical and structural composition: CaCO3-MgCO3. However, in the form of natural (or mine), dolomite is not much, mixed with other carbonate minerals of aluminum and iron. For example, the type of braunspat that contains 5 - 20% iron carbonate, ankerite (dolomite iron) contains more iron than magnesium. Because of the different crystalline structure conditions, the crystal structure of the mixed mineral network is also different, leading to significant differences in the physical and chemical properties of dolomite and thereby leading to the products in application to production.
In parallel with the rapid economic development of the country, the demand for clean water and treatment of waste sources from industrial, agricultural and domestic production is increasingly required to meet the direction of stable development. Dolomite and especially products made from it are products that are widely used in the world for the purpose of: filtering domestic water, improving the water environment for the purpose of aquaculture or cultivating specific plants, color treatment for some types of wastewater, acidic gases.
Please contact us for advice and best quotes:
Son Phuoc Dinh., JSC
Tel/Whatsapp: +84 983 383 286
Email: sonphuocdinhjsc@gmail.com