Limestone Coarse Grinding Machine

The main component of limestone is calcium carbonate (CaCO3). Calcium carbonate is a compound, which is a common material on the earth and can be found in rocks. Lime and limestone are widely used as building materials and important raw materials for many industries. Limestone can be directly processed into stone and fired into quicklime. Lime is divided into quicklime and hydrated lime. The main component of quicklime is CaO, which is usually massive, pure white and light gray or yellowish when containing impurities.

Limestone grinding process

Limestone powder making is generally divided into four types: coarse limestone powder processing (0-3mm), fine limestone powder processing (20 mesh-400 mesh), ultra-fine limestone powder processing (400 mesh-1250 mesh) and micro-powder processing (1250 mesh-3250 mesh).

1. Fragmentation

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

2. Grinding

After crushing, small pieces of limestone material are sent to the silo by the hoist, and then uniformly and quantitatively sent to the grinding room of the grinder by the vibration feeder for grinding.

LM vertical mill, MTW European mill and 5X European intelligent mill are generally used for fine powder processing; LUM ultra-fine vertical mill and MW ring roller micro-mill are generally used for ultra-fine powder processing; CM European coarse mill and direct centrifugal mill are used for rough powder processing.

3. Grading

After grinding, the material is classified by the flour separator, and the unqualified powder is classified by the flour separator and returned to the main machine for re-grinding.

4. Pollination

Fineness powder is separated and collected in the dust collector with the air flow through the pipeline. The collected powder is sent to the warehouse by the conveying device through the outlet, and then packed in a powder cart or an automatic packer.

Material is evenly transported by vibration feeder to jaw crusher for crushing. When the material meets the requirement of grinding particle size, it is transported to storage bin by bucket elevator. Then it is uniformly transported to Raymond mill by electromagnetic vibration feeder for grinding. The grinded powder is blown into the analyzer of Raymond mill under the action of blower. Line sorting, does not meet the fineness requirements of the re-grinding room for grinding, fineness of powder with the air into the cyclone collector, for separation and collection, and then discharged through the powder pipe is the finished powder.

1. Production Process Of Quicklime Powder

After limestone (or block quicklime) material is crushed to the required size by a limestone finer, the material is sent to the hopper by a hoist, and then uniformly and continuously into the grinding chamber of the main machine of Raymond Mill by a vibrating feeder. Due to the centrifugal force during rotation, the shovel knife at the bottom of the main machine of the grinder will remove the material limestone (or block limestone). Lime) is lifted upward, so that limestone (or block quicklime) is pressed between the grinding ring and the grinding roller. Material is sent between the grinding roller and the grinding ring. The purpose of crushing limestone is achieved by rolling the grinding roller. When limestone fines enter the main machine, the hot air is sent to the first-level dust collector on the top of the main machine of the Raymond mill, and 200 meshes are obtained. Lime powder and other coarse fine lime particles fall into the base of the mill and are grinded by a shovel knife. Qualified fine powder is fed by hot air to the first-class air separator at the top of the main engine, 325 purposes to the second-class air separator, through the air separator into the pulse dust collector, and then into the packaging machine for packaging.

2. Production Process Of Hydrated Lime Powder

In the production process of raw lime powder, the lime machine is added to the lime powder production process. The fine raw lime material is crushed by Raymond mill and then enters the digester for heating water digestion. It is fully digested by computer automatic water distribution. (Hongcheng Creation of computer-equipped heating water digestion lime is the leading technology in the industry, greatly shortening the digestion time and improving the digestion time. Efficiency). After digestion, quicklime is turned into ripe lime and then grinded twice to obtain ripe lime powder. Cooked lime powder is usually used in power plant desulfurization technology, and the grinding equipment for the production of cooked lime powder is in power plant, which is called desulfurization grinder by tobacco factory professionals.

Equipment Configuration of Limestone Grinding Production Line

Limestone grinding into lime powder is mainly used in equipment: jaw crusher, impact crusher, conveyor, vibration feeder, screening machine, limestone grinder and so on.

  • 1. Crushing: First of all, raw materials of limestone need to be crushed preliminarily by jaw crusher. The jaw crusher has stable performance and large crushing ratio. It can crush materials with larger size and hardness. It is very suitable for crushing limestone.
  • 2. Fine crushing: After the first rough crushing, fine crushing equipment can be selected in a wide range, can use cone crusher, impact crusher, jaw crusher, these equipment are used for limestone fine crushing good helpers, fine crushing effect, adjustable grain size of the material, low energy consumption, feeding capacity and processing capacity. Can fully meet the production needs of users.
  • 3. Grinding: For limestone grinding, the commonly used grinding equipment is Raymond grinder. This equipment can independently claim a production system, which can realize the whole process of grinding, powder making and packaging. Moreover, the finished product has fine and uniform particle size, excellent quality, high pass-sieve rate of 99%, strong wear resistance of the whole machine, and no equipment. Faults are easy to occur and the production process is stable and reliable.
  • 4. Flour separation: After grinding, the fine material is classified and screened by the flour separator, and the unqualified fine powder should be returned to the grinder for re-grinding.
  • 5. Packaging: After powder selection, qualified limestone powder enters the storage warehouse through pipeline device, and is uniformly packed by powder tanker.

Industrial Application Value Of Different Fineness Limestone Powder

Limestone is a kind of carbonate material and an important resource for the production and processing of calcium carbonate. Through the processing of limestone powder into different fineness limestone powder by professional machinery and equipment, the industrial uses of limestone are also very different. Only the limestone powder meeting different production and application indexes can bring considerable market benefits.

  • 1. When the size of limestone product is between 40 mesh and 150 mesh, it can be used in the production of construction, interior and exterior wall coating, chemical raw material filling, weighting, paper making, various sealants and other chemical products, and the processing of this fine limestone product;
  • 2. When the size of limestone product is between 150 mesh and 200 mesh, its calcium content is very low. It is usually used in asphalt mixing station of expressway. The processing of limestone product can be accomplished by general equipment without specific grinder.
  • 3. When the size of limestone product is between 250 mesh and 325 mesh, it is mainly used for desulfurization in power plants. The calcium content of limestone product is high. It has two standards: one is 250 mesh through-screen 90, the other is 325 mesh through-screen 90.
  • 4. When the size of limestone products is between 325 and 1500 meshes, it is mainly used in the application market and high-tech fields with higher production requirements. Limestone can process more than 325 meshes of calcium carbonate powder, which can be used as an important additive for non-woven materials and high-performance coatings, so as to enhance the application value of limestone calcium powder. Secondly, it is also an important raw material for the production of artificial granite, which is very popular in the current hot artificial stone market.

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