calcium carbonate mill

Ultrafine Grinding mill for Making Calcium Carbonate Powder:

08/04/2019

Ultrafine Grinding mill for Making Calcium Carbonate Powder will be listed in this article, and we also invite you provide valuable advice for ultrafine grinding mill.

There are two methods to grind calcium carbonate into ultrafine powder: dry grinding and wet grinding:

The dry grinding is generally used to produce calcium carbonate powder with d97 ≥ 3-5 μm, and the wet grinding generally produce calcium carbonate with d97 ≤ 3-5 μm.  

The dry grinding also use the following ultrafine grinding mill: Raymond mill, suspension roller mill, ball mill, agitating mill, vibrating mill, press roller mill and various mechanical impact mills.

Raymond mill is widely used for the production of 38-74μm (200-400 mesh) products, and raymond mill is also used to produce fine powder of d97=30-15μm (500-800 mesh) after modification and configuration of fine classifier;

   Ball mill is the main equipment for the large heavy calcium carbonate production line. It is used to produce heavy calcium carbonate products with fineness of d97=5μm, 10μm, 16μm and 45μm equipped with various classifiers.

    The vibration grinding mill equipment is mainly used for the production of d97=5μm, 10μm, 16μm products, but its production capacity is not as good as that of ball mill;

    The mechanical impact mill is simple in grinding principle but low in output and is mainly used in small and medium-sized heavy calcium carbonate production plants;

     Dry stirring mills are used in large heavy calcium carbonate production plants in Europe, but they are also currently used in China.

1. Ultrafine calcium carbonate ball mill production line with a annual production of 70,000 tons:

Technical data of the ultrafine calcium carbonate powder grinding mill line:

Raw material less than 8 mm;

Product specifications and output: d97 ≤ 5μm 12,000 tons / year, d97 ≤ 10μm 18,000 tons / year, d97 ≤ 45μm 40 tons / year;

Total power: 1730kW;

Compressed air pressure 600kPa, air volume m³ / min;

The circulating cooling water is 17 m³/h.

2, Dry stirring mills production line

  This mill production line produce ultrafine calcium carbonate power which is used as a filler for polymer-based composite materials such as plastics and rubber. The whole production line consists of raw material crushing, dry grinding, turbine classifier and high-speed spiral continuous mixing machine

  Calcium carbonate powder fineness can be adjusted between 1-44μm. When the final product does not require surface treatment, it may not pass through the mixing modifier.

3. Dry vibration grinding mill production line:

   After the raw materials are pre-crushed, they are transported to the raw material warehouse by the bucket elevator; the raw materials are quantitatively fed into the vibrating mill for grinding by the variable frequency speed belt scale, and the modifier is injected into the upper and lower cylinders of the vibrating mill; After the negative pressure of the ore powder is sent to the air classifier for classifying, the coarse powder is sent to the vibrating mill under the tube mill for grinding again, and the measurement result is fed back to the computer control system to adjust the feeding of the variable frequency speed belt scale. The amount is to ensure the over-feeding amount of the vibrating mill; the fine powder enters the cyclone separator to separate the finished product; the ultrafine calcium carbonate powder is collected into the bag filter to be the finished product.

Wet grinding for ultrafine calcium carbonate powder:

    Ultrafine calcium carbonate powder d97≤5μm (d90≤2μm or d60≤2μm) made by wet grinding is often used for papermaking and paint coating.

   The wet process line is mainly used for the production of ultra-fine heavy calcium carbonate d97≤5μm (d90≤2μm or d60≤2μm) for papermaking and paint coating. The wet grinding mill includes various types of wet mixing ball mill, web sand mill and wet spiral mixing mill.

   The whole wet grinding is mainly composed of a wet agitating mill or a grinding and stripping machine, and a corresponding storage tank and pump. The raw material is adjusted into a certain concentration (or solid-liquid ratio) slurry by adding water and a dispersing agent to the slurry tank, and is pumped into the stirring mill through the slurry tank for continuous grinding. The finished slurry after grinding and grinding is separated into grinding medium and then enters the slurry tank, and the magnetic separator is used to remove iron pollution and iron-containing impurities.

   If the line is built close to the user or closer to the user, it can be sent directly to the user with a pipe or tank. If it is far away, the slurry is dewatered and then broken up and packaged.

   Wet sand mill production line with an annual output of 58,000 tons of slurry.

 The product product index and output are d90 (90% ≤ 2μm) 20,000 tons / year, d60 (60% ≤ 2μm) 38,000 tons / year; working system: 7200h / a (300d / a); raw material particle size: not greater than 45 μm.

ultrafine calcium carbonate grinding mill

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