As an important non-metallic mineral raw material, kaolin's crushing process directly affects the quality and production cost of finished products.In view of its physical characteristics of medium hardness (Mohs grade 2-3), obvious brittleness, and the need to control iron pollution, the following key factors need to be considered in the selection of equipment：

1.Jaw crusher

It is suitable for the coarse crushing stage, especially when dealing with large pieces of raw ore.Its structure is simple and the maintenance cost is low, but the finished product has a thicker particle size (usually 10-50mm), which needs to be used with subsequent fine crushing equipment.It is recommended to choose a model with an iron removal device to avoid metal parts from wearing and contaminating materials.

2.Hammer crusher

It has the advantage of efficient crushing of medium and low hardness materials, and can achieve one-time molding (particle size≤5mm).However, it is necessary to pay attention to the choice of hammer head material (high chromium alloy is recommended), and configure a closed-circuit circulation system of grading screen to avoid over-crushing.This model has high energy consumption and is suitable for small and medium-scale production lines.

3.Roller crusher

It performs well in the fine crushing stage, and the particle size (0.1-2mm) of the discharge can be accurately controlled by adjusting the roller surface gap.Its low-speed characteristics can effectively reduce dust, and it is especially suitable for the processing of ceramic-grade kaolin with high whiteness requirements.It is recommended to use a hydraulic protection device to prevent hard objects from damaging the roller surface.

Selection suggestions：

Jaw crusher (PE series) is preferred for coarse crushing

It is recommended to use a combination of hammer breaking + roller machine for fine crushing

Ultra-fine processing (<0.074mm) requires the introduction of air flow mill or ball mill

The actual selection also needs to be combined with the production requirements (it is recommended to reserve 20% of the production capacity for redundancy), site conditions and automation requirements for a comprehensive assessment.Regular testing of iron content (controlled below 0.3%) is an important part of quality assurance.