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Limestone Grianding Mill and Limestone Pulverizing Process2023-06-21 16:11:00

About Limestone

The main component of limestone is calcium carbonate (CaCO3), and lime and limestone are widely used in building materials and industrial raw materials. Limestone is directly processed into stone and fired into quick lime, which absorbs moisture or adds water to become hydrated lime, the main component is Ca(OH)2. Hydrated lime is blended into lime paste, stone plaster, etc., used as coating materials and adhesives for bricks and tiles. Calcium carbonate is the main component of limestone, which is the main raw material for the production of glass. Calcium carbonate can be directly processed into stone and fired into quicklime. Lime has quicklime and hydrated lime, the main component of quicklime is CaO, generally blocky, pure white, containing impurities is light gray or light yellow. Quicklime absorbs moisture or adds water to become slaked lime, slaked lime is also called hydrated lime, its main component is Ca(OH)2. The hydrated lime is blended into lime paste, lime plaster, lime mortar, etc., which is used as coating materials and adhesives for bricks and tiles. Cement is a mixture of limestone and clay, which is calcined at high temperatures.

How to choose limestone mill

  1. First of all, it is necessary to clarify the application field of limestone powder. The main component of limestone is calcium carbonate, widely used in the field of building materials, the main property is that calcium oxide and carbon dioxide can be decomposed at high temperatures, therefore, it is an important industrial raw materials, the choice of grinding machine, need to take into account the different size, temperature, viscosity of limestone, equipped with grinding model is also different.
  1. Secondly, the production capacity of the mill is very important for the selection, the mill equipment model is very many, there are many kinds of grinding mills that can grind limestone, some mills have high production capacity, but the loss is large, and some mills have low production capacity, but energy saving, for different application fields, only the suitable is the best.
  1. Third, people who know the powder industry know that the requirements for powder fineness in different fields are not the same, only by choosing the right model, grinding out the powder fineness suitable for use in this field is more important, if the fineness of the finished product does not meet the requirements, the output is no longer useful. Therefore, it is also important to choose a mill that is suitable for the production fineness.

Application areas of Limestone

Limestone is the main raw material for the production of cement, concrete coarse aggregate, lime, etc. Its crushing and grinding are generally dry process, and the corresponding process is selected according to different application fields:
For the limestone used in metallurgy and road construction, the ore is generally crushed and screened.
For the 80~325 mesh fine powder products used as feeding additives and ordinary fillers, the ore is generally broken by the ball crusher, hammer crusher, impact crusher, etc., directly with Raymond mill, ring roller mill and other grinding.
For the ultrafine limestone powder and high-grade fillers used in flue gas desulfurization, ultrafine crushing and fine classification are generally carried out, and the process equipment is basically the same as the ultrafine crushing of calcite. The equipment that needs to be used is a ultrafine grinding mill or a ultrafine vertical mill.
According to the use of limestone raw materials can be roughly divided into:
  1. sand and stone,do building aggregate: generally processed to 1-4cm.
  1. the production of active lime, pure lime, used in cement industry, metallurgical desulfurization, dephosphorization agent.
  1. chemical powder, used in papermaking, rubber, plastic, paint, coating, ink, the product price depends on the product size, whiteness, surface treatment, the price difference is about ten times.
  1. limestone casting sand is 28-75 mesh, this sand is better than quartz sand collapsibility, casting surface is smoother.
  1. Dietary calcium supplements that directly or indirectly supplement calcium to the body.
  1. Grinding powder for chemical fillers:
    1. 1 Paper: more than 200 mesh
    2. 2 Rubber, plastic: more than 400 mesh
    3. 3 Coating, coating: more than 600 mesh
    4. 4 Ink: 1500 mesh or more
The main products of grinding powder are: light calcium, heavy calcium, calcium hydroxide, gray calcium, double fly powder.

Limestone Grinding Process

Stage 1: the crushing of limestone
The bulk limestone material is broken by the crusher to the fineness of the feed (15mm-50mm) that can enter the mill.
Stage 2: grinding
The small pieces of crushed limestone material are sent to the storage hopper by the elevator, and then evenly and quantitatively sent to the grinding room of the mill by the feeder.
Stage 3: grading
The material after grinding is graded by the classification system, and the unqualified powder is graded by the classifier and returned to the host machine for re-grinding.
Stage 4: collection of finished products
The powder conforming to the fineness enters the dust collector through the air flow through the pipeline for separation and collection, and the collected finished powder is sent to the finished product silo through the discharge port by the conveying device, and then the powder filling tank truck or automatic baler is used for packaging.

Product recommendation

Raymond mill
The capacity of Raymond mill is about 0.2~50 t/h, the max feed size is 35mm, and the fineness of the finished powder is about 50~325 mesh. And Raymond mill complete sets of strong, a complete production system, including equipment: Raymond mill host, analysis machine, pipeline device, blower, finished cyclone separator, bucket elevator, electromagnetic vibration feeder, dust collector, electric control motor and so on. Raymond mill as a whole is a vertical structure, occupies a small area, compared with other mills, Raymond mill finished powder sieve rate is high.
Ultrafine grinding mill
The production capacity of the ultrafine grinding mill is about 0.5~45t/h, the maximum feeding size is 20mm, and the fineness of the finished product is 325~3000 mesh. The advantages of the ultrafine grinding mill are: fewer times of bearing replacement, long service cycle, and 3-5 times longer life than other mills; The discharge can be regulated, high efficiency, fast operation, the separator can be variable frequency speed regulation, the discharge fineness control is accurate; Installed with a new type of high efficiency pulse dust removal equipment, and equipped with noise reduction device, the dust, noise and other pollution is basically eliminated, the establishment of green production workshop.

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