| Fe | SiO2 | Al2O3 | P | S | Moist | + 10mm | -0.15 mm |
|---|---|---|---|---|---|---|---|
63.5%/63% |
3.50% |
3.50% |
0.08% |
0.02% |
8% |
10% |
30% |
63%/62% |
4.00% |
4.00% |
0.08% |
0.02% |
8% |
10% |
30% |
61%/60% |
5.00% |
5.00% |
0.08% |
0.02% |
8% |
10% |
30% |
59%/58% |
5.50% |
5.50% |
0.08% |
0.02% |
8% |
10% |
30% |
58%/58% |
5.50% |
5.50% |
0.08% |
0.02% |
8% |
10% |
30% |
| Fe | SiO2 | Al2O3 | P | S | Moist | + 10mm | -0.15 mm |
|---|---|---|---|---|---|---|---|
63.5%/63% |
3.50% |
3.50% |
0.08% |
0.02% |
6% |
5% |
10% |
| Fe | SiO2 | Al2O3 | P | S | Moist | + 10mm | -0.15 mm |
|---|---|---|---|---|---|---|---|
64% |
3.50% |
2.00% |
0.05% |
0.02% |
2% |
20% |
5% |
Limestone is a sedimentary rock, made up mostly of the mineral calcite, a form of calcium carbonate, CaCO3. The calcium carbonate is originally produced by living animals (such as shellfish). Later, much of it goes into solution in sea water, and then is deposited as limestone. Calcium carbonate gets precipitated when the physical condition of the water changes. For example, if the concentration of CaCO3 is high, then a temperature drop, or a pH (acidity) change, can cause precipitation.
| Sr No. | Chemical Analysis Of Limestone | |
|---|---|---|
| Constituents | Range% | |
| 1 | SiO2 | 4.25 - 8.25 |
| 2 | CaO | 44.65 - 48.75 |
It is generally used as limestone tiles, limestone slabs in flooring, wall cladding, vanity tops and to pave the floors of large commercial complexes, hospitals, airports, shopping malls, railway stations, parks etc. It is used to make glass and cement. It can be used like chalk, as it is mostly calcium, so you can actually draw with the stone. It is also used to make iron in a blast furnace, to remove impurities from the iron ore.
| Sr No. | Chemical Analysis Of Bentonite | |
|---|---|---|
| Constituents | Range% | |
| 1 | SiO2 | 37 - 46 |
| 2 | Al2O3 | 22 - 28 |
Bentonite has high swelling properties along with good viscosity and liquid limit. These properties are highly valued in most of the industrial applications. Sodium bentonite is well suited as a binder in the preparation of pellets, and in foundry and oil - well drilling mud. Bentonite also acts as a suspending agent in oil - well drilling fluids. Bentonite exhibits good green strength along with high hot and dry strength which helps in preventing moulds from breaking or cracking during the pouring or cooling processs in the foundry industry. Owing to high green strength resulting from its property to absorb and then release moisture, bentonite is used in iron ore pelletisation. Sodium-based bentonite of 75 mm size finds suitability in iron ore pelletisation for bonding by user industries. Bentonite has also remarkable colloidal and waterproofing properties. Bentonite gels are used as a carrier for a number of cosmetic preparations, toothpastes, creams, etc.
Bentonite is also used in chemical, rubber, insecticide & pesticide industries and in civil construction works. Bentonite in the form of fine powder free from dirt and other foreign matter and of least swelling property is used in ceramic industry.
