1 Introduction
2 Experimental
2.1 Studied materials
Component | CaCO3 | SiO2 + NR | MgCO3 | Fe2O3 | Al2O3 | Na2O | K2O | Heavy metals |
---|---|---|---|---|---|---|---|---|
Weight (%) | 96.00 | 1.50 | 1.50 | 0.11 | 0.08 | 0.023 | 0.037 | Trace amounts |
2.2 Measurements methods
2.2.1 Evaluation of the hydrophobization degree by “floating on water” and wetting angle measurement
Preparation | Wetting angles (°) |
---|---|
Limestone meal | |
Raw material | 33.7 ± 6.04 |
Stearic acid | 101.6 ± 9.96 |
Silicone preparation | 125.5 ± 5.77 |
Bituminous preparation | 105.8 ± 2.64 |
Limestone sand | |
Raw material | – |
Stearic acid | 120.9 ± 7.65 |
Silicone preparation | 112.9 ± 7.19 |
Bituminous preparation | 104. ± 2.85 |
2.2.2 Adsorption measurements
Adsorption parameters | Raw material | Stearic acid | Silicone preparation | Bituminous preparation |
---|---|---|---|---|
Limestone meal | ||||
SBET (m2/g) | 2.630 | 1.534 | 1.353 | 0.350 |
Vtot 0.98 (cm3/g × 103) | 7.772 | 5.342 | 2.075 | 0.545 |
Vmez DH (cm3/g × 103) | 3.975 | 2.764 | 1.169 | 0.378 |
S mez DH (m2/g) | 1.767 | 1.110 | 0.821 | 0.214 |
Limestone sand | ||||
SBET (m2/g) | 0.638 | 0.555 | 0.310 | 0.053 |
Vtot 0.98 (cm3/g × 103) | 1.530 | 1.734 | 0.334 | 0.329 |
Vmez DH (cm3/g × 103) | 0.770 | 0.896 | 0.205 | 0.282 |
Smez DH (m2/g) | 0.292 | 0.307 | 0.140 | 0.173 |
Adsorption parameters | Raw material | Stearic acid | Silicone preparation | Bituminous preparation |
---|---|---|---|---|
Limestone meal | ||||
SBET (m2/g) | 2.35 | 2.35 | 1.03 | 0.24 |
S0.2 (m2/g) | 2.20 | 1.69 | 0.87 | 0.18 |
Vtot 0.2 (cm3/g × 103) | 0.0006 | 0.0005 | 0.0002 | 0.0001 |
Limestone sand | ||||
SBET (m2/g) | 0.51 | 0.41 | 0.27 | 0.06 |
S0.2 (m2/g) | 0.45 | 0.34 | 0.20 | 0.05 |
Vtot 0.2 (cm3/g × 103) | 0.0001 | 0.0001 | 0.0001 | 0.0000 |