Dolomite is a non-metallic mineral with extremely rich reserves. It is an important calcium and magnesium resource on the earth. Dolomite rock (dolostone) is also a sedimentary carbonate rock, dominated by dolomite, but often mixed with quartz, feldspar, calcite, and clay minerals.

Dolomite has extremely important industrial value.

Dolomite has extremely important industrial value. The processed dolomite block, dolomite powder, magnesium alloy, cement, and other products are widely used in construction, steel, glass, ceramics, agriculture, etc. This blog will introduce how to process dolomite rock and its 11 practical uses.

How to process dolomite rock?

Before establishing a dolomite processing plant, Crusher is done to understand Crusher.

Process 1: Crushing and screening dolomite rock

The crushing and screening process is to obtain dolomite blocks. Dolomite blocks can be directly used as sand and gravel products in the construction industry, and can also be ground or calcined to obtain other products.

Because dolomite is brittle and has high hardness (harder than limestone), it is easy to scratch with iron, so it needs two-stage crushing by a jaw crusher and a cone crusher.

    1Coarse crushing: After mining, large dolomite rock enters Crusher for coarse crushing.
  1. 2Fine crushing: Then the dolomite rock enters Crusher for fine crushing. It is crushed into dolomite blocks of small particle size to achieve sufficient dissociation of the useful material of the ore.
  2. 3Screening: The crushed dolomite blocks enter Crusher for screening. Qualified materials are directly used as sand and gravel aggregates, or continue to be processed. However, unqualified dolomite will return to the cone crusher for further crushing.

Equipment Parameters Specifications Cheapest price Jaw crusher

Feed size: ¡Ü1,200 mm

Output size: ¡Ü350 mm

Capacity: 1-1,000 t/h

PE Jaw Crusher

PEX Jaw Crusher

$1, 000 /Set Cone crusher

Feed size: ¡Ü560 mm

Output size: ¡Ü40 mm

Capacity: 1-2,200 t/h

Single-cylinder Cone Crusher: Cheap.

Cone Crusher: Most Popular.

Hydraulic Cone Crusher: Best high-end option.

$5, 000 /Set Vibrating screen

Feed size: ¡Ü200 mm

Sieve layer£º2-4

Circular Vibrating Screen

High Frequency Vibrating Screen

$1, 000 /Set

Process 2: Grinding and classifying dolomite rock

The grinding process is to obtain the dolomite powder needed in the market, mainly including 200 mesh, 325 mesh, 425 mesh, and 800 mesh.

Grinding and classifying dolomite rock

    1grinding: The crushed dolomite is transported from the bottom up to the silo by Crusher and then sent to Crusher for grinding by an electromagnetic vibrating feeder.
  1. 2Classifying: After grinding, the dolomite powder is classified by Crusher. Qualified dolomite powder, such as 250 mesh, can produce glass, ceramics, magnesium fertilizer, etc. 600 mesh can produce toothpaste and soap. The unqualified powder will return for regrinding.
  2. 3Dust collecting: Fine dolomite powder enters Crusher. The collected powder is sent to the finished product silo. The system has a 99% dust collection rate and low noise, so it is environmentally friendly.

The selection of a dolomite grinding machine is very important because it affects the quality of the powder. Ftmmachinery grinding machines have unique features.

Grinding machines Parameters Better than other competitors Raymond Mill

Feed size: ¡Ü30 mm

Output size: 120-325 mesh

Max. capacity: 176 t/h

Cheapest price: $14,600 /Set

1. Performs better. Its service life is extended by 4 times.

2. Has a screening rate of 99%.

3. Has a finer powder with a uniform texture and fewer impurities.

4. Has a much cheaper price.

Ultrafine Mill

Feed size: ¡Ü35 mm

Output size: 60-800 mesh

Max. capacity: 40 t/h

Cheapest price: $14,600 /Set

Remark: For conversion from millimeter to mesh, please refer to Crusher.

Process 3: Calcinating dolomite rock

The crushed dolomite is calcined in a Crusher, which is used for producing refractory materials, magnesium alloys, cement, etc.

Dolomite is calcined at 1500¡ãC to obtain magnesia-calcium raw materials, such as dolomite sand, magnesia-calcium sand, and magnesia-calcium iron sand. Then it is made into refractory materials.

Dolomite rock - Preheating - Calcining ¨C Cooling - Mixing and grinding - Briquetting - Refining magnesium - Magnesium alloy.

    1Preheating: The dolomite rock evenly enters the preheater to be preheated to above 800¡ãC.
  1. 2Calcinating: Choose an energy-saving Crusher to calcine the dolomite at 1250¡ãC into a higher-grade calcined white.
  2. 3Cooling: The high-temperature activated calcined white is cooled by Crusher to below 100¡ãC. The air is preheated to above 600¡ãC.
  3. 4Mixing and grinding: Put dolomite, ferrosilicon (within 20 mm), and fluorite powder into Crusher for mixed grinding. The particle size is within 100 mesh. The dust removal system is equipped.
  4. 5Briquetting: Press the powder into briquettes with Crusher. Another dust removal system can be equipped.
  5. 6Refining magnesium: Using Electrolysis or Silicothermic Reduction to extract magnesium metal.
  6. 7Magnesium alloy: Finally, the magnesium alloy is produced by Crusher or other methods.
    One method is to make caustic powder by calcination. Then add magnesium chloride solution or magnesium sulfate solution to make magnesium oxychloride cement with better stability.
  • The other method is to calcinate it into caustic dolomite, and then processed it into magnesium hydroxide cement and magnesium oxide sulfate cement.

The key equipment of the calcination process is the Crusher. Ftmmachinery Rotary Kiln has the following unique advantages:

    Higher quality products. The kiln body adopts three heating methods of calcination, sintering, and pyrolysis. The heat distribution is uniform.
  • The capacity is 180-10,000 t/h, meeting the production needs of large, medium, and small dolomite processing plants.
  • Equipped with auxiliary devices such as high-efficiency heat exchangers, dust collectors, and sealing systems, it is very environmentally friendly.
  • Lower selling price. The minimum selling price of each set is $1, 000.

Practical uses of dolomite products

1. Use of dolomite in steel making

Dolomite powder can improve the hardness and toughness of iron and steel. It is normally used in 4 forms: (1) as a fluxing material; (2) for protection of refractory lining; (3) as a refractory raw material; (4) for producing refractory bricks.