I. Application

Limestone grinding mill is mainly suitable for ultra-fine powder processing of non-inflammable and explosive brittle materials with medium and low hardness and Mohs hardness ≤6, such as calcite, chalk, limestone, calcite, carbon black, kaolin, bentonite, talc, mica, magnesite, illite, pyrophyllite, vermiculite, sepiolite, attapulgite, rectorite, diatomaceous earth, calcite, gypsum, alum, graphite, fluorite, phosphate rock, potassium ore, and more than 100 kinds of materials such as pumice, the fine powder finished product can be adjusted freely between 325-3000 mesh, and the output can reach 0.5~12 tons per hour.


II. Introduction.

Limestone is a widely distributed calcium carbonate mineral. At present, the supply of calcium carbonate powder in the world is still in short supply. It is expected that the demand for calcium powder will continue to expand rapidly in the future, and the prospect of investment calcium carbonate powder is broad. Dawn Heavy Industries, as a valuable solution provider for grinding equipment, specializes in non-metallic mineral processing for 30 years, providing you with a complete processing solution for limestone.

Calcium carbonate fine powder for artificial stone, artificial floor tile, natural rubber, synthetic rubber, paint, plastic, composite new calcium plastic, cable, paper, toothpaste, cosmetics, glass, medicine, paint, ink, cable filling materials for power insulation, food, textile, feed, adhesives, sealants, asphalt, building materials, linoleum construction products, fireproof ceilings and household chemicals. It can not only reduce the product cost of various industries, but also improve the function and performance of related products, and increase the volume of the product. It is one of the most widely used inorganic filler masterbatches. The addition of ground calcium carbonate ultrafine powder to the cable skin can increase the insulation strength of the cable by 5-10 times. If the car chassis coating made of ultra-fine powder of calcium carbonate or more is used, the chassis of the car can be more resistant than the steel plate. Ability; in the catalytic cracking of petroleum, molecular sieves, detergents, purification agents, product modification, metal smelting, chemical synthesis, aerospace, high temperature superconductivity, machinery manufacturing, etc., especially in high-tech fields have a wide range of applications. Ultrafine calcium powder can be used as a base material in these industrial sectors, and the demand is also particularly large. Therefore, ground calcium carbonate have become the upstream and original materials for most industrial manufacturing, and almost all the production and manufacturing sectors of light and heavy industries.


III. The equipment composition of limestone grinding mill:
Complete set of calcite mill includes hammer crusher, bucket elevator, storage bin, vibrating feeder, micro-grinding main machine, frequency classifier, double cyclone dust collector, pulse dust removal system, high pressure fan, air compression machine, electrical control system.


IV.The working principle of limestone grinding mill:
During operation, the main motor of the mill drives the spindle and the turntable through the reducer, and the roller pin on the edge of the turner drives dozens of grinding rollers to roll in the grinding ring raceway.
Original mineral material is broken into small particles by a hammer crusher and then sent to the storage bin by the hoist, and then the granules are evenly sent to the bulk disc of the upper part of the turntable through the vibrating feeder and the inclined feeding tube.

The particles are scattered to the circumference of the circle under the action of centrifugal force, and fall into the raceway of the grinding ring, which is impacted, rolled and ground by the ring roller. After three or four layers of loop processing, it becomes calcium carbonate powder, and the high pressure fan passes the suction to the outside. The air is sucked into the machine, and the crushed calcium carbonate powder is brought into the classifier.

The rotating impeller in the classifier reduces the coarse calcium carbonate powder to re-grind. The fine powder that meets the requirements enters the cyclone dust collector with the airflow and is discharged from the lower discharge valve, which is the final ultrafine calcium carbonate powder with a small amount. The fine dust air stream is purified by a pulse dust collector and discharged through a fan and muffler.


V. Processing technology

The first stage: crushing

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

The second stage: milling

The crushed limestone small pieces are sent to the silo through the hoist, and then uniformly and quantitatively fed into the grinder grinding chamber through the vibrating feeder for grinding.

The third stage: grading

The ground material is graded by a classifier, and the unqualified powder is classified by the classifier and returned to the main machine for re-grinding.

The fourth stage: collecting powder

The fine powder conforms to the airflow and enters the dust collector through the pipeline for separation and collection. The collected finished powder is sent to the finished silo by the conveying device through the discharge port, and then uniformly packaged by the powder tanker or the automatic baler.


VI. Performance characteristics of limestone grinding mill:
Efficient:in the case of the fineness of the calcium carbonate powder and the same motor power, the limestone grinding mill is more than twice as high as the jet mill, the agitator mill and the ball mill;
Consumable parts have a long service life:the grinding roller and the grinding ring are forged with special materials, which greatly improves the durability. In the case of the same fineness of materials and finished products, the wearing parts of the limestone grinding mill are 2-3 times longer than the wearing parts of the impact crusher and the turbo crusher, generally up to one year; The mill has a service life of 2-5 years when processing calcium carbonate and limestone;

High safety and reliability:since there are no rolling bearings and screws in the grinding chamber, there is no problem that the bearing and its seal are vulnerable, or the problem of destroying the machine due to loose screws;

High product fineness:the fineness of the calcite powder processed by the mill can reach D97≤5μm at one time;

Small pollution to the environment:environmentally-friendly pulse dust collectors and mufflers in the mill equipment greatly reduces dust and noise pollution to the surrounding environment.


VII. Detail technical specification.













Feeding size(mm)                   ≤10
Feeding material moisture(%)                   ≤3%
Powder fineness(mesh) 










Power consumption(kw.h/t) 










Installed capacity(kw) 










Compressed air(m3/min)