Industrial Clay, Ceramic, & Brick Crushers

Grog is pre-fired clay that is reintroduced into a fresh clay batch during brick or ceramics production. It is used to control shrinkage during firing, adjust the texture of the finished product's surface, and influence the density and porosity of the fired material. The particle size of the grog has a direct effect on all three of these outcomes. Coarser grog produces a rougher texture and higher porosity. Finer grog produces a denser, smoother result. Most brick and ceramics formulations specify a target grog gradation as part of the batch recipe, and the crusher handling the grog needs to produce a consistent output that stays within that specification across production runs. Our Grand-Slam HSI and the other equipment in our secondary processing line are used for grog crushing in brick and ceramics plants where consistent particle size control is a production requirement.

Roller mills were the standard grinding room equipment in brick plants for decades because they handled the abrasive, variable-hardness nature of clay and shale inputs without catastrophic failure. The tradeoff was high maintenance frequency, significant wear part costs, and the need for frequent gap adjustment to maintain output specification. The rollers themselves required regular resurfacing or replacement, and the adjustment mechanisms needed operator attention to prevent gradation drift during a production run. Stedman's introduction of impact-based crushing technology for the brick and clay industry over 20 years ago offered an alternative with lower maintenance requirements, lower wear parts costs, and lower initial capital cost for grinding room equipment. The millions of dollars in industry-wide savings that followed came from reducing the total cost of ownership over the equipment's service life, not just from the purchase price.

Whether a single machine can handle both materials economically depends on how different they are in hardness and abrasiveness. Raw shale and fired brick or grog are substantially different materials. Fired brick and grog are harder and more abrasive than unfired shale, and running them through a machine configured for softer feed accelerates blow bar and breaker plate wear faster than operating cost projections based on the softer material would predict. Many brick plants run separate machines or separate circuits for raw material preparation and recycled grog processing. If your plant needs to process both material types and is evaluating whether one machine or two is the right approach, submitting samples of both materials for testing at our Aurora facility is the most direct way to get an answer based on measured wear rates rather than estimates.

Particle size requirements in brick manufacturing vary by product type and by plant-specific formulations. Facing brick, floor tile, roof tile, and refractory fire brick each carry different body preparation specifications, and plants that produce multiple product lines often work to different particle size targets depending on what is running. In practice, output gradation is controlled by adjusting breaker plate position on an HSI crusher, changing screen or grate bar opening size on hammer mill configurations, or adjusting cage mill parameters. Our test reports on brick and clay materials include particle size distribution curves produced under documented operating conditions, which gives customers a realistic picture of what each machine configuration achieves on their specific material before the equipment is installed.

Raw clay at elevated moisture levels does not process the same way dry clay does. Material above a certain moisture threshold tends to smear rather than fracture under impact, which can clog discharge openings, accumulate on rotor components, and cause the kind of operational disruptions that translate directly into grinding room downtime. The acceptable moisture range depends on the specific clay mineral composition, the machine configuration, and the target output specification. Some raw clay inputs require partial drying before they enter the primary crusher. Others can be processed at field moisture levels without issue. The safest way to determine the appropriate moisture range for your specific clay is to run a sample through our testing facility, where we can document how it behaves at different moisture levels before you finalize your plant design or equipment selection.

In brick plant practice, the terms are often used interchangeably for equipment that reduces raw or recycled clay to a usable feedstock particle size. More precisely, crushing refers to the initial high-reduction stage where large feed is broken down, and grinding refers to further refinement toward finer particle size targets. In modern brick plant grinding rooms, the distinction matters in terms of which machine is doing which job. An HSI crusher handles the high-reduction primary and secondary stages. A cage mill or hammer mill handles the finer grind stages where the output specification requires a particle size distribution that an impact crusher alone cannot consistently achieve. Our equipment line covers both stages, and our engineers can help define which combination is appropriate for your specific material inputs and product requirements.