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dolomite
  • 2021-03-26 14:01
  • HCM

What is dolomite

Dolomite is a carbonate mineral, including iron dolomite and manganese dolomite. Its crystal structure is like calcite, often rhombohedral. Bubbles will slowly appear when exposed to cold dilute hydrochloric acid. Some dolomites emit orange-red light under cathode ray irradiation. Dolomite is the main mineral component of dolomite and dolomitic limestone. Dolomite crystals belong to the carbonate minerals of the trigonal crystal system. The pure ones are white; gray when containing iron; brown after weathering, with glassy luster, and are the main minerals that make up the dolomite.

Uses of dolomite

Dolomite can be used in building materials, ceramics, glass and refractory materials, chemical industry, agriculture, environmental protection, energy saving and other fields. It is mainly used as a flux for alkaline refractory materials and blast furnace ironmaking; production of calcium magnesium phosphate fertilizer and preparation of magnesium sulfate; and ingredients for the production of glass and ceramics. In other applications, it can be used as a flux in the glaze.

Some ancient kilns in the north, such as Ding kiln, often add dolomite to the glaze, and dolomite is also added to some glazes in Jingdezhen.

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Dolomite pulverizing process


Dolomite raw material composition analysis 

CaO MgO CO2
30.4% 31.89% 47.7%

Remarks: It often contains impurities such as silicon, aluminum, iron, and titanium.


Dolomite grinding mill selection scheme


Product specifications (mesh)

Fine powder processing 

(80 mesh-400 mesh)

Deep processing of 

superfine powder

 (400 mesh-1250 mesh)

Micro powder processing 

(1250 mesh-3250 mesh)

Selection scheme Raymond mill

HCH ultra fine grinding mil

Vertical grinding mill HLMX superfine vertical grinding mill


Remarks:  Select the host according to the output and fineness requirements.

1. Crush raw materials

The bulk material of dolomite is crushed by the crusher to the fineness (15mm-50mm) that can enter the mill.

 

2. Milling

The crushed small dolomite materials are sent to the storage hopper by the elevator, and then sent to the grinding chamber of the mill evenly and quantitatively by the feeder for grinding.

 

3. Classification

The ground material is classified by the classification system, and the unqualified powder is classified by the classifier and returned to the main engine for re-grinding.

 

4. Collect finished products

The powder that meets the fineness is separated and collected in the dust collector through the pipeline through the airflow. The collected product powder is sent to the finished product silo through the discharge port by the conveying device, and then is packaged by a powder tanker or an automatic baler.


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Analysis of various mills

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HLM series vertical mill

HLMX series superfine vertical mill

Large-scale equipment and high output 

can meet large-scale production. Vertical mill has high stability. 

Disadvantages: high equipment investment costs.


It can produce 1250 mesh ultra-fine powder at 

one time, and the supporting multi-level 

classification system can produce the smallest 

3μm powder. The equipment has high efficiency and high degree of spheroidization of the 

powder, making it an ideal equipment for 

producing high-quality micropowders. 

Disadvantages: The equipment investment cost is higher than that of the ring roller mill.


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HCH Ring Roll Superfine Mill

HC series pendulum mill

The equipment has low investment cost 

and low energy consumption. It is a 

cost-effective ultrafine powder processing 

equipment; disadvantages: low output of 

a single machine, multiple equipment is 

required for planned production.


HC series pendulum mill Low investment cost, 

high output, low energy consumption, stable 

equipment, low noise; disadvantages: single 

machine output is degraded, and equipment 

large-scale is limited.



Classic case of dolomite milling


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Processing material: Dolomite

Fineness: 325 mesh D97

Output: 8-10t/h

Equipment configuration: 1 HC1300

 

The whole set of Hongcheng equipment has a compact process and a small footprint, which saves plant costs. The entire system is fully automated, and a remote monitoring system can be added. Workers only need to operate in the central control room, which is simple to operate and save labor costs. The performance of the mill is also stable, and the output has reached expectations. All the design, installation guidance, and commissioning of the entire project are free of charge. Since the use of the Hongcheng mill, our output and efficiency have improved, and we are very satisfied.





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