Abstract: Washed kaolin contains high moisture while calcined kaolin brings higher abrasion. This content shows kaolin grinding workflow, SCM mill performance and classification precision importance for high-end kaolin powder.
Kaolin includes washed kaolin and calcined kaolin. After grinding processing, kaolin powder is widely used for ceramic body raw material, coating filler, paper making filler and rubber industry products. Ceramic-grade kaolin powder mostly uses 325 mesh fineness; coating and paper making grade filler requires 800-1250 mesh; high-end coating-grade calcined kaolin can reach 1500-2000 mesh. Calcined kaolin hardness and abrasiveness increase after calcination, which puts higher demand for mill wear-resistance and classification accuracy.
Dry-process kaolin grinding workflow contains raw material crushing, impurity removal, drying (compulsory for high-moisture washed kaolin), silo storage, feeding grinding, high-precision air classification and finished powder collection. Washed kaolin contains large amount of free water. Drying procedure must be completed before dry grinding, otherwise material sticks on grinding chamber inner wall and causes serious blockage. For high-end coating-grade kaolin, classifier performance directly determines commercial value of final powder.
For multi-variant small-batch kaolin powder factories producing both ceramic-grade ordinary powder and high-end ultrafine calcined kaolin filler, SCM Series Ultrafine Mill is suitable ultrafine grinding equipment. It can flexibly adjust finished powder fineness ranging from 325 mesh to 2500 mesh to satisfy alternating production of multiple-grade kaolin products. Heavy rotor design plus strict dynamic balance treatment makes mill run stably with low-vibration status. Grinding chamber has no exposed bearing and loose screw structure, reducing common vibration-caused faults.
High-efficiency vertical turbine powder classifier realizes precise particle size cutting and prevents coarse powder mixing inside finished kaolin. Dual powder collecting system combining cyclone collector and pulse dust collector guarantees high dust collecting efficiency. Matched sound insulation room and muffler lower workshop noise pollution. Wear-resistant roller and ring can be upgraded for calcined kaolin high-abrasion working condition.
Many kaolin project operators only pay attention to equipment nominal capacity but ignore classifier precision and drying unit matching. They get kaolin powder with wide particle size distribution and cannot enter high-end coating filler market after commissioning. Raw material type (washed or calcined), moisture content and downstream product standard should be confirmed in early-stage technical communication.
If you intend to build kaolin grinding production line for ceramic-grade or coating-grade calcined kaolin powder, please submit your project information via page message or business consultation button. Tell us raw material type, moisture, target capacity and finished powder mesh requirement. SBM technical engineers will customize complete drying-grinding-classification process scheme for your kaolin powder plant.
Summary: This article differentiates washed kaolin and calcined kaolin processing requirements. It introduces SCM ultrafine mill strengths and drying necessity for high-moisture washed kaolin raw material.
FAQ
Q1: What mesh fineness for most ceramic body-grade kaolin powder?
A: Most ceramic body material production adopts around 325 mesh kaolin powder.
Q2: Which mill fits ultrafine calcined kaolin powder production?
A: SCM series ultrafine mill can handle 325-2500 mesh calcined kaolin ultrafine powder production.
Q3: Must washed kaolin be dried before dry grinding?
A: Yes. Washed kaolin carries high moisture. Drying pretreatment avoids sticking blocking fault inside grinding mill.
