Limestone
C & B Marble is one of the leading producers of marble blocks, slabs and tiles in the Philippines. A lot of marble products have been sold to the U.S.A., Australia, Italy, Japan, Korea, China, Taiwan, Singapore, Malaysia, South Africa, Saudi Arabia, United Arab Emirates and the domestic market.
In 2001, C & B Marble decided to put up a limestone crushing and pulverizing plant to maximize the utilization of limestone from its quarries in Norzagaray, Doña Remedios Trinidad and San Rafael, Bulacan. In May 14, 2002, the C & B Limestone Mill was inaugurated.
The C & B Limestone Mill can produce various products for agricultural, architectural and industrial uses. These products are specifically used for animal feeds (nos. 7, 8 and 20), for glass manufacturing (No. 30), for architectural uses (No. 10 and 5), and for other industrial products (No. 100 and Mesh 325, calcium carbonate). The plant rated capacity is 8,000 tons per month.
Production Process
- The limestone boulders are crushed on the Primary Jaw Crusher (24"x36") that has a capacity of 60 tons per hour. The crushed materials with a diameter of less than 2" are stored on Silo No. 1 with a capacity of approximately 100 tons.
- From Silo No. 1, the materials are further crushed on the Secondary Jaw Crusher (9"x16"), the size is less than 1" diameter. The capacity is 15 tons per hour.
- From the secondary jaw crusher, the materials are pulverized using two (2) hammer mills, then screened to segregate the limestone to the desired grit size. Each product has its own silo and a semi-automatic weighing and bagging machine.
The available sizes and production capacity are:
- For Animal Feeds - 7.5 tons per hour
- #7
- #8
- #20
- For Glass Manufacturing
- #30 - 2.4 tons per hours
(Note: The volume of production for glass can be increased but the volume for animal feeds will decrease.)
- #30 - 2.4 tons per hours
- For Architectural Uses - 0.5 ton per hour
- #10
- #5
- For Industrial Uses and Animal Feeds
- #100 - 2.4 tons per hour
- For Industrial Uses
- Mesh 325 (Calcium Carbonate) - 0.60 ton per hour
- For Animal Feeds - 7.5 tons per hour
- All the products are packed 50 kilos on a polypropylene sack.
Laboratory Analysis
Laboratory analysis was conducted by the Mines and Geo-Sciences Bureau last May 6, 2002 on the limestone sample submitted, and herewith are the result:
A. Chemical Processes
| Lime, CaO, | 54.45% |
| Silica, SiO2, | 0.07 |
| Alumina, Al2O3, | 0.96% |
| *Ferric Oxide, Fe2O3, | 0.089% |
| Magnesia, MgO, | 0.47% |
| Moisture, H2O (105 0C), | 0.09% |
| Loss on Ignation, LOI, | 43.63% |
| **Calcium Carbonate, CaCO3, | 97.18 |
| **Calcium Carbonate, CaCO3, | 97.18 |
*Computed From FeT
**Computed From Cao
B. Calcium Content (for Animal Feeds)2 38.58%(Average)
C. Physical Properties (Particle Size)3
| Product Code/Distribution Percentage | ||||||
|---|---|---|---|---|---|---|
| Particle Size | No. 7 | No. 8 | No. 20 | No. 30 | No. 100 | No. 325 |
| Tyler #8 | 22.84% | 0% | 0.97% | 5.38% | 0% | 0% |
| Tyler #16 | 73.68% | 15.55% | 81.95% | 64.52% | 3.47% | 0% |
| Pass Tyler #16 | 0.48% | 84.44% | 17.07% | 30.10% | 96.53% | 100% |
- Conducted by the Mines and Geo-Sciences Bureau, Department of Environment and Natural Resources on May 6, 2002.
- Conducted by CARGILL Central Laboratory, Agribrands Philippines, Inc. on June 22, 2002.
- Conducted by CARGILL Central Laboratory, Agribrands Philippines, Inc. on June 9, 2002.
