Responses of soil microbial activities to soil overburden …
Soil physical properties included bulk density, moisture, and temperature. Soil bulk density in the 5 cm soil cover was significantly higher than that in the 15 cm soil cover (P < 0.05), but there was no significant difference between 10 cm soil cover and no soil cover (P > 0.05) (Table 1).Soil temperature increased gradually with the increase of soil thickness, the soil …
Effect of coal gangue grading characteristics on cemented …
The porosity test should be carried out following the guidelines set by ASTM C29/C29M-2016 "Standard Test Method for Bulk Density ("Unit Weight") and Aggregate Voids" [16]. The procedure involves taking an appropriate quantity of coal gangue and fully immersing it in water to ensure complete water absorption and saturation.
Bulk density, apparent density and breakage …
Download scientific diagram | Bulk density, apparent density and breakage ratio (inset) under 35 MPa of proppants sintered at different temperatures. ... Industrial waste coal gangue was ...
Barite (BARIUM)
gangue mineral in silver, zinc, copper, nickel and lead ores. It is colourless or white, often tinged with yellow, red, brown or bluish. Barite is used in the production of wallpaper and ... One Pound Bulk (gal) 0.0275 Bulk Density (lbs/ft.3) (ASTM C-110)-Loose 85 Tapped 144 .
Physical, chemical, and geotechnical properties of coal fly …
Fly ash has high specific surface area and low bulk density [20]. The amount of unburned carbon and iron impact the color of fly ash, which can vary from orange to deep red, brown, or white to yellow ... The maximum dry density (MDD) to which a granular material can be compacted, and the moisture content at which it occurs (optimum moisture ...
Effects of coal gangue on soil property and plant growth in …
Soil saturated water (SW), capillary water (CW), and field water capacity (FC) were decreased with increasing coal gangue ratio, particle size, and bulk density of reconstructed soil. >0.25 mm particle size aggregate (R 0.25), mean weight diameter (MWD), and geometric mean diameter (GMD) increased first and then decreased with the increases of ...
Preparing Shotcrete Materials Applied to …
When calculating the amount of shotcrete material applied to roadways, the bulk density of gangue mass, a non-continuous medium, is a crucial factor. This refers to the density of each particle size range in the …
Study on the performance of coal gangue ceramsite steel …
The apparent density, bulk density, water absorption, and crushing value of normal coarse aggregate (NCA), coal gangue (CG), and coal gangue ceramsite (CGC) were tested. The results were shown in Table 2. It could be seen that the apparent density and bulk density of normal coarse aggregate was the highest, followed by CG, and CGC was the lowest.
Valorization of calcined coal gangue as coarse aggregate in …
Coal gangue is a by-product generated from coal mining and washing. Using coal gangue as aggregate is an effective approach of valorization this high-volume industrial waste, not only solving the environmental issue of accumulation but also reducing the mining of natural aggregate. ... and its apparent density and bulk density are 2590 and 1310 ...
Effect of Sintering Temperature on Property of Low-Density …
Nitriding temperature also is an important factor. The bulk density of the specimen with MgO additive reaches maximum at 1.91 g/cm3 when sintered at 1450 °C, and the bulk density of specimen with CeO2 additive is 1.86 g/cm3 at the same condition while the bulk density of the specimen without additive is only 1.75 g/cSuperscript textm3.
Sustainable use of coal gangue and other wastes in …
Among the samples prepared in this experiment, the one with a coal gangue/fly ash/silica sand ratio of 48:32:20 exhibited a relatively uniform pore structure and demonstrated optimal overall performance, including a low bulk density of 0.67 g/cm³, a high porosity of 74.9 %, a suitable compressive strength of 6.9 MPa, and excellent acid resistance.
The Influence of Coal Gangue Particle Size on Water …
According to statistics, China presently has around 2600 large-scale coal gangue piles that hold 6–7 billion tons of coal. Furthermore, this volume is increasing faster than 300 …
The use of coal gangue as a planting substrate in arid mining …
As the amount of added coal gangue decreased, soil bulk density increased from 1.22 g·cm −3 to 1.39 g·cm −3. This parameter was generally lower in the experimental group …
Soil reconstruction and heavy metal pollution risk in …
The results showed that coal gangue filling reclamation and reconstruction activities led to increases in bulk density (BD), decreases in nutrients, and the accumulation of heavy metals. These activities also changed the relationship strength …
Experimental Study on the Compaction and …
According to changes in the bulk density of coal gangue specimens, it is evident that the initial bulk density of washed gangue is the smallest, close to 14 kN/m3, indicating that the initial bulk volume of washed gangue is the …
Low-temperature preparation of lightweight ceramic …
Lightweight ceramic proppants are prepared using coal gangue, fly ash, and bauxite as raw materials, and a mixture of manganese dioxide and magnesium oxide is used as composite additives. ... It also presents the desired sphericity, roundness, and microstructure. The apparent density, bulk density, and breakage ratio of the ceramic proppant ...
Gangue bulk density
— bulk density of C2 was clearly lower than that of C1 which indicated that adding a small amount of gangue could reduce the density of the proppants However when more coal gangue is added C3 and C4 the bulk density for low sintering temperature increased mainly for sintering temperatures above 1350 °C On the other
On-Site Measurement on Compaction …
The bulk density of the backfilling material is 22.2–17.6 kN m −3 under the compaction force of 0–2.5MPa. With the increase of compaction force, the deformation of gangue samples increases gradually. The bulk density …
Low-temperature preparation of lightweight ceramic …
Lightweight ceramic proppants are prepared using coal gangue, fly ash, ... The apparent density, bulk density, and breakage ratio of the ceramic proppant described above are 2.55 ± 0.06 g/cm 3, 1.03 ± 0.02 g/cm 3, and 8.30 ± 0.68% at 35 MPa, respectively. This ceramic proppant belongs to lightweight ceramic proppants and meets the ...
Estimation of Bulk Density, Recovery Tests and
Bulk Density Test for Iron Ore at Obulapuram Iron Ore mine dated 20-6-2014 Average Bulk Density: 2.98+3.02+3.03+2.51=2.88 Pit No.01, Pit No.2, Pit No.3 and Pit No.4 were cons idered for conducting ...
Effect of Sintering Temperature on Property of Low …
Bulk density and apparent density of the proppant first rise and then slightly decrease with increasing the sintering temperature, while breakage ratios under 35 MPa and 52 MPa pressure gradually decrease and then increase. ... Keywords: ceramic proppant, low …
(PDF) RECYCLING OF COAL GANGUE TO PREPARE LOW DENSITY …
The proppant sintered at 1400 °C have the best performance with 1.27 g/cm3 of bulk density, 2.79 g/cm3 of apparent density, 3.27 % of breakage ratio under 35 MPa closed pressure and 8.36 % of ...
Evaluation of the migration and environmental effects of …
The gangue's bulk density was 2.218 g/cm 3. The particle size distribution of fly ash was measured by a laser particle size analyzer. Fly ash has a median particle size of 62.67 μm, with 90% of particles smaller than 152.38 μm, and a bulk density of 0.861 g/cm 3. The mix ratio (mass fraction) of backfill was 63% gangue, 30% fly ash, 5% ...
Frontiers | Study on the synergistic preparation of functional …
At 10 d, the functional soil bulk density varied from 37.43% to 50.47%, and when the proportion of GS and CG was greater than 5wt%, the functional soil bulk density gradually decreased by 6.15%–24.84% compared to that of CK . However, there were no significant differences between the functional soil bulk density and porosity of different ...
Direct Reduced Iron (DRI)
In this study, the uniaxial loading test system of gangue backfilling material was developed, and the basic compaction characteristics of gangue were obtained, such as stress …
THE ROLE OF DRI AND HBI IN MODERN STEELMAKING …
Gangue 3.8% 6.2% 4.4% High Fe3C % Direct Reduced Iron High Graphite % Direct Reduced Iron. DRI CARBON AS A SOURCE OF ENERGY IN THE EAF The Carbon in DRI is source in two ways: 2C + O2 --> CO + Heat If the carbon is present as Iron carbide we have an additional source of energy from the Fe3C dissociation that is an ...
Mineralogical characterization of the typical coarse iron ore …
The application potential of upgrading the quality of iron ore by discharging waste gangue using the dry density-based gravity separation should be further determined and validated. Therefore, this work mainly focused on the mineralogical characterization of a typical iron ore, and the separation possibility of the coarse iron ore using the dry ...
Preparation and characterization of low-density ceramic …
When the feldspar are milled for 6 h, bulk density of the proppants is 1.46 g/cm3, apparent density is 2.70 g/cm3 and breakage ratio under 52 MPa closed pressure is 7.97%. View Show abstract
Improved extraction of alumina from coal gangue by surface …
The changes in bulk density of coal gangue particles with grinding time (Fig. 4) paralleled the changes in volume mean diameter, D 4,3. Bulk density decreased with grinding time between 8 h and 10 h, increased between 10 h and 14 …
On-Site Measurement on Compaction Characteristics of Coal Gangue …
TABLE 2 | Variation of bulk density of gangue samples in different stages. Uniform proportioning 0 – 50 mm 5 – 50 mm 10 – 50 mm 15 – 50 mm 20 – 50 mm 25 – 50 mm Original bulk density/(kN m