DOLOMITE

What Is Dolomite and How Are They Applied? 

Dolomite is a kind of limestone, it's composed of calcium, magnesium, carbon and oxygen. Its chemical name is calcium magnesium carbonate. It can occur as a sedimentary rock, which is found in vast deposits in many parts of the world, and also as crystals. In its pure form it is colorless or white, but the rock and crystals often contain impurities, especially iron, that effects colors, it is commonly pinkish in hue, but can be yellow, gray, brown or black. Dolomite is chiefly used as refractory, ramming, and fettling material in steel melting shop, and as fluxing material in blast furnace operation in secondary steel and ferromanganese manufacture, to a lesser extent it is used in the glass industry especially in sheet-glass manufacture. It also finds use in the manufacture of mineral wool etc.

The Dolomite/Limestone for Glassmaking Industries

         

Glass is indivisible part of our daily life, from the packing of food and beverage, to the car we drive and place we live; it’s exited in every aspect of modern human life.

Dolomite/Limestone is one of the important raw materials for glassmaking industries, which can be used as a stabilizer to improve mechanical and physical characters of glass. Normally, the content of high calcium limestone (94.5% CaCO3) and 97.5% of combined CaCO3 and MgCO3, the content of CaO should be 53% and CaO + MgO needs to be 54.50%, Silica (SiO2) is permissible up to 2.5%. Iron and other colouring substances are regarded as objectionable and Fe2O3 should be up to 0.20% (max). For colourless glass, iron content as Fe2O3 should be less than 0.04%; and for bottle glass, Fe2O3 up to 0.05% is acceptable.

CERG's Dolomite (Calcium Magnesium Carbonate) is ideal raw materials for the commercial glassmaking, because of the high purity and very low levels of undesirables and detrimental substances to the glassmaking process. The very low Iron content typically down to 0.01% Fe2O3 and high Calcium content up to 98.5% CaCO3 and with the extra advantage of consistent Magnesium content typically of 20% MgCO3.

CERG's CM-P Series Calcium Magnesium Carbonate with the stable physical properties and consistent chemical composition, is very ideal for the container glassmaking industries.  

 

Calcium Magnesium Carbonate CM-P Series

 

    Code

     CaO

     MgO

    Fe2O3

   Al2O3

    SiO2

      LOI

      Size

 

 

 

 

                                                                                     Maximum

    CM-P

  31.80%

  20.73%

    0.01%

  0.056%

   0.13%

  45.70%

 Customized

 

 

 

 

Description

Dolomite is a type of limestone that is made up of calcium carbonate and magnesium carbonate as well as other essential inerals.

Packing

In plastic woven bag with inner double PVC bags of 25kg, 50kg, 500kg or Jumbo Bag, as well as according to customers' requirements.

*Customized sizes can be made in bulk and regular orders.

 

The Dolomite/Limestone for Iron and Steel Industries

         

Dolomite is basically used as slag former, slag modifier and refractory material and limestone is used as slag former in iron and steel industries. The process of iron making is the reduction of iron oxide to iron. Iron ore normally contain gangue materials such as silica (SiO2), alumina (Al2O3) along with sulphur (S) and phosphorus (P). Removal of these impurities is done by combining the gangue materials with CaO and/or MgO to form slag which consists of low melting point complex compounds such as calcium silicate, calcium aluminate etc. CaO and MgO is charged along with other raw materials in the form of limestone and dolomite or it is charged through sinter where again fines of limestone and dolomite is used. This limestone or dolomite is first decomposed into CaO or CaO+MgO which then combine with gangue to form slag. Further lime from limestone reacts with sulphur present in the raw materials to form CaS which goes into slag.

During pretreatment of hot metal in desulphurization plant lime is an essential component of the desulphurizing compound. During steel making high basicity of the steel making slag is being maintained with the help of lime. Lime is also used in secondary steel making. In steel melting shop, fettling of the lining as well as patching is done with dolomite based compounds. Calcined dolomite is also used in converters to maintained MgO levels in the steel making slags. It also acts as a slag modifier in case of slag splashing. Burnt dolomite is also used for making refractory bricks for the purpose of lining in steel melting shop.

CERG's CM-S Series Calcium Magnesium Carbonate is perfect for Iron and Steel Industry with its consistency in physical and chemical properties.  

 

Calcium Magnesium Carbonate CM-S Series

 

    Code

     CaO

     MgO

    Fe2O3

    Al2O3

     SiO2

      LOI

     Size

 

 

 

 

 

    CM-S

  31.80%

   21.87%

    0.04%

   0.06%

    0.16%

   46.25%

 Customized

 

 

 

 

Description

Dolomite is a type of limestone that is made up of calcium carbonate and magnesium carbonate as well as other essential inerals.

Packing

In plastic woven bag with inner double PVC bags of 25kg, 50kg, 500kg or Jumbo Bag, as well as according to customers' requirements.

*Customized sizes can be made in bulk and regular orders.


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