Calcium carbonate minerals vary from hard to soft, with a primary composition of CaCO3, and most commonly referred to as limestone, dolomite, chalk, and marble depending on its natural composition. High-grade rocks, which have higher calcium content and low silica levels, are particularly valuable because of their use across a wide range of applications, including animal feed, fertilizer, and white paints.
Bradley Mills are in high demand for calcium carbonate milling because of their exceptionally low kilowatt-per-ton power consumption. With growing demand for both fine and coarse calcium grit, the economic benefits can be further enhanced by adding a divorced classification system, allowing multiple grit sizes to be captured in a single run.
| Application: Calcium Carbonate (CaCO3) |  |
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| Material | Application | Outcomes | Bradley Equipment |
| Agricultural Limestone | Direct soil application to reduce acidity | 50% passing 150 micron | Screen Mill |
| Filler for mastic asphalt | Mastic blocks for flexiable sealing joints in roads and bridges | 50% passing 75 micron | Screen Mill |
| Mine dust | Prevents dust explosions in coal mines. Sone can be waterproofed, by adding checmicals to mill | 70% passing 63 micron | Airswept Mill |
| Filler for asphalt | For coated roadstone | 85% passing 75 micron | Airswept Mill |
| Fillers for rubber and plastic | Example – carpet backing | 90-95% passing 75 micron | Airswept Mill |
| Limestone powder for steel and iron works | Usually used in sinter plant for pellet production | 85% passing 75 micron | Airswept Mill |
| Unburnt cores from limekiln | 50% passing 150 micron | Screen Mill | |
| Quiklime from limekiln | Used to make lime/sand bricks | 90% passing 90 micron | Airswept Mill |
| Coarse sorbent | For SOx removal in FBC Boilers | 70% passing 300 micron / 15% passing 45 micron | Airswept Mill |
| Fine sorbent | For SOx removal in flue gas catalysed boilers | 90% passing 90 micron | Airswept Mill |
| Limestone for C.A.N. fertilizer (calcium – ammonium – nitrate) | Used to reduce soil acidity | 90% passing 40 microns | Airswept Mill |
| White pigment | For paint manufacturing | 100% passing 44microns | Airswept Mill |
| Limestone for oil well drilling mud | Need to dry in mill | 97% passing 75 microns | Airswept Mill |
| Marble | For facing ceramic tiles | All passing 2 mm | Screen Mill |
| Marble Waste | For filler | 80-90% passing 75 micron | Airswept Mill |
Materials Processing Testing and Product Development Services
Looking for an opportunity to prove your concept?
Do you want to calculate your actual cut rate and recovery rates versus relying on theoretical calculations?
Need to confirm that an airswept mill system is the right fit for your application?
We welcome the opportunity to apply our 100+ years of experience to test your materials with you at our in-house materials testing facility. Both laboratory and pilot scale testing is available.