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The ultrafine calcium carbonate powder used in papermaking is obtained by grinding the raw material limestone or calcite through a grinding mill. Generally speaking, the fineness requirement of calcium carbonate powder for papermaking is 200 mesh-1250 mesh, so a multi-stage grinding process is required, and a high-fine grinding machine is used for grinding during the production process.
The production process of ultrafine calcium carbonate powder used in papermaking is mainly divided into several steps such as raw material preparation, crushing, grinding, grading, drying, and packaging.
Raw material preparation
The raw material of ultrafine calcium carbonate powder for papermaking is generally limestone or calcite, which has high quality requirements and should have the characteristics of high whiteness, few impurities, and moderate hardness. After the raw materials are crushed and screened, coarse powder is obtained.
The coarse powder is broken into small particles by the crusher for easy grinding. The choice of crusher should be determined based on the hardness of the raw materials, output and other factors.
The coarse powder is ground by a grinder to obtain ultrafine calcium carbonate powder. The selection of grinding mill should be determined based on factors such as finished product fineness and output. Commonly used mills include ball mills, Raymond mills, ultra-fine mills, vertical roller mills, etc.
The ultrafine calcium carbonate powder after grinding needs to be classified due to uneven particle size to obtain products that meet the requirements. Commonly used classification equipment include vibrating screens, air flow classifiers, etc.
Ultrafine calcium carbonate powder has a high moisture content and needs to be dried to reduce the moisture content and improve the fluidity and storage stability of the powder. Commonly used drying equipment includes drum dryers, fluidized bed dryers, etc.
The dried ultrafine calcium carbonate powder needs to be packaged for easy transportation and storage. Commonly used packaging materials include plastic bags, paper bags, etc.
The equipment of the ultrafine calcium carbonate powder production line for papermaking mainly includes the following types:
Raw material storage bin: used to store calcium carbonate raw materials, usually limestone or calcite.
Crusher: used to crush raw materials to obtain coarse powder.
Mill: Used to grind powder to obtain ultra-fine calcium carbonate powder.
Classifier: used to classify ultrafine calcium carbonate powder to obtain products that meet the requirements.
Dryer: used to dry ultrafine calcium carbonate powder and reduce moisture content.
Packaging machine: used to package ultra-fine calcium carbonate powder for easy transportation and storage.
The equipment configuration of the specific production line should be determined based on factors such as production scale, raw material conditions, and finished product requirements.
The key equipment of the paper grade calcium carbonate production line is the grinding mill. The selection of grinding mill needs to be determined based on factors such as the hardness, fineness requirements and output of the raw materials. At present, commonly used grinding machines include Raymond mill, European version mill, micro powder mill, etc.
Raymond mill is a traditional grinding mill with the advantages of simple structure, convenient operation and low price, but its output is low and the fineness is coarse. The European version mill is an improved version of Raymond mill. It has the advantages of high output and high fineness, but its price is higher. Micro-powder mill is currently the most advanced grinding mill, with the advantages of high output, high fineness, and low energy consumption, but its price is also relatively high.
The production process of paper grade calcium carbonate production line is relatively simple, but the following points need to be noted:
Selection of raw materials: The hardness, fineness and impurity content of the raw materials will affect the fineness and performance of the powder.
Optimization of grinding process: Reasonable selection of grinding machine and grinding process according to the characteristics and fineness requirements of the raw materials.
Storage and transportation of powder: Powder should be stored in a dry, ventilated environment and protected from moisture and dust.
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