Introduction to Dolomite
Limestone bases on Calcium Carbonate (CaCO3). Lime and limestone is widely applied as construction material and industrial material. Limestone can be processed into building stones or be baked into quick lime, and then add water to make slaked lime. The lime slurry and lime putty can be used as coating material and adhesive. Lime is also the majority material for glass industry. Combined with clay, after high temperature roasted, lime can be used to produce cement.
Application of Limestone
Limestone is grinded by limestone grinding mill to prepare limestone powder. Limestone powder is widely used according to different specifications:
1. Single fly powder:
It is used to produce anhydrous calcium chloride and is an auxiliary raw material for the production of sodium dichromate. Main raw materials for glass and cement production. In addition, it is also used for building materials and poultry feed.
2. Shuangfei powder:
It is a raw material for the production of anhydrous calcium chloride and glass, white filler for rubber and paint, and building materials.
3. Three flying powders:
Used as filler for plastics, paint putty, paint, plywood and paint.
4. Four flying powders:
Used as filler for wire insulation layer, rubber molded products and filler for asphalt felt
5. Desulfurization of power plant:
It is used as desulfurization absorbent for flue gas desulfurization in power plant.
Limestone pulverizing process flow
At present, the largest amount of limestone powder is limestone powder for desulfurization in power plant.
Component analysis of limestone raw materials
|
CaO |
MgO |
Al2O3 |
Fe2O3 |
SiO2 |
so3 |
Firing quantity |
Lost quantity |
|
52.87 |
2.19 |
0.98 |
1.08 |
1.87 |
1.18 |
39.17 |
0.66 |
Note: Limestone varies greatly from place to place, especially when the content of SiO2 and Al2O3 is high, it is difficult to grind.
Limestone powder making machine model selection program
|
Product fineness (mesh) |
200 mesh D95 |
250 mesh D90 |
325 mesh D90 |
|
Model selection scheme |
Vertical mill or large-scale Raymond mill |
||
1. Power consumption per ton of system product: 18 ~ 25kwh / T, which varies according to raw materials and product requirements;
2. Select the main machine according to the output and fineness requirements;
3. Main uses: power desulfurization, blast furnace smelting solvent, etc.
Analysis on grinding mill models
1.Raymond Mill, HC series pendulum grinding mill: low investment costs, high capacity, low energy consumption, equipment stability, low noise; is the ideal equipment for limestone powder processing. But the degree of large-scale is relatively lower compared to vertical grinding mill.
2. HLM vertical mill: large-scale equipment, high capacity, to meet the large-scale production demand. Product has high degree of spherical, better quality, but the investment cost is higher.
3. HCH ultrafine grinding roller mill: ultrafine grinding roller mill is efficient, energy-saving, economical and practical milling equipment for ultrafine powder over 600 meshes.
4.HLMX ultra-fine vertical mill: especially for large-scale production capacity ultrafine powder over 600 meshes, or customer who has higher requirements on powder particle form, HLMX ultrafine vertical mill is the best choice.
Stage I: Crushing of raw materials
Large limestone materials are crushed by the crusher to the feeding fineness (15mm-50mm) that can enter the pulverizer.
Second II: Grinding
The crushed small limestone 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.
Stage III: Classifying
The milled materials are graded by the grading system, and the unqualified powder is graded by the classifier and returned to the main machine for re grinding.
Stage V: Collection of finished products
The powder conforming to the fineness flows through the pipeline with the gas and enters the dust collector for separation and collection. The collected finished powder is sent to the finished product silo by the conveying device through the discharge port, and then packaged by the powder tanker or automatic packer.
Application examples of limestone powder processing
Desulfurization project of a 150000t / a power plant of a calcium industry group in Hubei
Model and number of equipment: 2set of HC 1700
Processing raw material: Limestone
Fineness of finished product: 325 Mesh D96
Equipment output: 10t / h
The calcium industry group is a large metallurgical ash production enterprise in China's township enterprises, a designated supplier of metallurgical raw materials for large and medium-sized enterprises such as WISCO, Hubei iron and steel, Xinye steel and Xinxing pipe industry, and a leading calcium powder enterprise with a production capacity of 1 million tons of limestone. Guilin Hongcheng began to participate in the desulfurization project transformation of the power plant in 2010. The owner successively purchased two Guilin Hongcheng HC1700 vertical pendulum grinding mill equipment and two 4R Raymond mill equipment. Up to now, the grinding mill equipment has operated stably and brought high economic benefits to the owner.
Post time: Oct-22-2021
