Overview of ultrafine crushing equipment for ultrafine kaolin

Ultrafine pulverization of kaolin is available in both dry and wet processes.

The dry method is mostly used for superfine pulverization of coal-based kaolin, and the coal-based kaolinite is directly pulverized into ultra-fine powder of a certain fineness, and then enters calcination or other processes. Generally, the fineness requirement is -10μm>90%, and the crushing equipment mostly uses a high-speed impact pulverizer, a vibration mill, a high-speed centrifugal mill, and a dry stirring mill. In order to control the particle size distribution of the product, especially the maximum particle limit, a dry micro-segmentation machine needs to be configured. There are currently classifiers such as MS type, MSS type, and ATP type.

Wet type is mostly used for ultra-fine pulverization of soft kaolin after sand removal and decontamination, and also used in coal-based kaolin production coating grade products -2μm>90% wet superfine pulverization. Kaolinite is a flaky crystal form, and wet superfine pulverization of kaolin is also called flaking.

The methods of stripping include a wet superfine grinding stripping method, a high pressure homogenizing method, and a chemical immersion method.

The grinding and peeling method mainly relies on the high-speed impact, friction and shearing action of the medium ball, so that the kaolin is peeled off into fine particles along the layer. The commonly used equipment is a stripping machine (sand mill) and a stirring mill. Ball medium used glass beads, alumina balls, zirconia beads or natural quartz sand, medium ball diameter 0.5-4mm.

The working principle of the high-pressure homogenization method is to pressurize the kaolin slurry in the homogenizer barrel to 20-60 MPa by a piston pump, and the high-pressure slurry is from the nozzle of the homogenizer (the surface is subjected to a hardened narrow gap) Line speeds greater than 950 m/s are mutually squeezed out. As the pressure suddenly drops sharply, the kaolin crystal stack in the slurry is “loose”, and the high-speed jetted slurry hits the impeller in the normal pressure zone, suddenly changing the direction of motion, resulting in a strong cavitation effect, loose The crystal stack is peeled off between layers under the action of cavitation.

The chemical immersion method uses a chemical agent to soak the kaolin. When the agent is immersed between the crystal faces of the crystal laminate and hydrogen-bonded, the bonding force between the crystal faces becomes weak, and the crystal laminate is loosened. With a small external force, the laminated wafer can be peeled off. The chemicals used in the chemical immersion method include urea, benzidine, acetamide, and the like. After calcination, the kaolin needs to be broken up and activated to meet the specific requirements of the coatings, plastics, rubber or cable industry.

Changsha Mining and Metallurgy Research Institute adopts JM-680A industrial vertical spiral mixing grinding machine. Using a stirrer apparatus and the cylinder body and wear resistant engineering ceramic lined steel alloy, the cylinder inner diameter 689mm, the effective volume of 600L, production capacity 200-400Kg / h, the discharge opening of the pneumatic valve, discharge valve automatic control switch It is very convenient for industrial application and has no dust flying. The industrial production amount is 200kg per time, the raw material is kaolin calcined at 800 degrees, the particle size is -20μm powder, and the temperature is 120 degrees.

The industrial production process uses spiral feeder feeding to the vertical spiral mixing mill. The activator is added together with the feed port. When the activation grinding time is 20 minutes, the pneumatic valve is automatically controlled to control the discharge port. Discharge, discharge, and automatically close the discharge discharge product with a slag screen. The coarse material on the sieve is returned to the mill for grinding to ensure product quality.

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