· The compressive strength and leaching toxicity test demonstrated that the MCS/geopolymer/MoS 2 composite could effectively solidify and stabilize Hg. The excellent Hg immobilization property of MCS/geopolymer/MoS 2 was mainly attributed to the synergy effect between geopolymer and MoS 2 .
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· In the present study, hydrogen-based pre-reduction experiments of chromite were carried out by varying the H 2 :CO ratio of reducing gas, reduction temperature, and duration. The degree of Fe metallization, Fe 2+ degree, and
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www.rockmass.net 2011-03-01 Uniaxial compressive strength ( c), E-modulus and the factor mi in the Hoek-Brown failure criterion for rock masses Average values from tests Tests of rocks world of intact rock samples -wide* Scandinavian rocks tested at
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· The strength of the compacted pellets, known as the cold compressive strength (CCS), was determined in accordance with ISO 4700:2007 []. Similar to the method used to determine GCS, a universal tensile testing system was utilized to measure the maximum load (kg/pellet) that the pellet could withstand, which was recorded as the
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strength from 45 cms and 100 cms height for different cur-ing durations. To establish suitable binder for cold bonding, pellets were prepared from chromite fines with different binders as shown in Table 3 and tested for their compression strength and drop strength
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· The influence of chromite with different Cr/Fe ratios on compressive strength of preheated and roasted pellets is described in Fig. 4. When increasing the Cr/Fe ratio from 1.35 to 2.55, the strength of preheated and roasted pellets was obviously reduced from 506 N/P and 1900 N/P to 190 N/P and 690 N/P, respectively.
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· Chromite ore fines (0–25 mm) are commonly used to produce sintered pellets to use in ferrochrome production process. The compressive strength of sintered pellets was found lower than plant samples but it was mainly due to different sintering conditions and
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· The results show that the compressive strength of fired nickel laterite pellet can reach over 2000 Newton per pellet while firing at the temperature of 1220°C-1250°C in 12 min. The product
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The furnace chamber was flushed with pure argon for 20 minutes. Then, the sample was heated in pure argon to 1000°C at a heating rate of 10°C/min and then to the maximum temperature at a rate of 5°C/min. The re-tention time at the maximum temperature was 180 min, still in pure argon. The maximum temperature was 1600°C.
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· The compressive strength of magnetite pellet at 1548 K (1275 C) can reach nearly 3000 N per pellet, whereas that of chromite pellet can only reach about 1300 N per pellet. The microstructure of two pellets is in good correspondence to the thermal and phase analysis, showing that the consolidation of oxidized ferrous pellets is largely
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· When the content was 30%, the compressive strength was 28.35 MPa, which met the compressive-strength requirements for building materials (10 MPa). The leaching concentration of Cr in the LZC gradually increased with an increase in the COPR content, but all of them were under the safety limit of 5 mg/L; moreover, the solidification
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600 C, followed by air-cooling to room temperature before subjecting them to different metallurgical tests. Photographs of the green pellets vis-a`-vis indurated pellets are shown in Figure 2. 3. Characterization a. Cold Compressive Strength (CCS) The CCS of the
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:Chromite Ore Processing ResidueClay BindersPelletised Chromite · In this study, the effects of carbonaceous reductant selection on chromite pre-reduction and cured pellet strength were investigated. Multiple linear
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· Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(vi However, in the freeze–thaw cycle experiments, the compressive strength of the solidified bodies consistently
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· Semantic Scholar extracted view of "Methane–Hydrogen-Based Pre-reduction Chromite: Reduction Behavior and Pellet Compressive Strength" by Shaowen Wu et al. DOI: 10.1007/s11837-024-06707-y Corpus ID: 270573937 Methane–Hydrogen-Based Pre-reduction
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compressive strength of concrete when chromium waste is used as admixture. In this respect, experimental factors at two levels, which are admixture type (chromite/ chromite+ superplastizer), admixture percentage (5-15%) and cure duration (7-28 days), are
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Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, The compressive strength of the solidified specimens in the control group reached a maximum value (99.21 MPa) after 10 freeze–thaw cycles, and a minimum the
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Chromite, a mineral of the spinel group, is the only commercially viable source of virgin chromium units. Geologically, commercial chromite deposits in the world are found in three forms, i.e. alluvial-, podiform-, and stratiform-type deposits (Murthy et al., 2011; Cramer et al., 2004). Alluvial deposits were formed by weathering of chromite
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· The uniaxial compressive strength in a specimen increases rapidly after the transition strain rate, and the stress state changes from uniaxial stress to uniaxial strain state (Brace and Jones 1971). Based on the compressive impact tests of rock materials, semi-empirical equations were developed to express the relationship between the DIF
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:Publish Year:2008Veerendra Singh, S. Mohan Rao · The effect of chromite ore granulometry and sintering process parameters was evaluated to improve the metallurgical performance of pellets in a submerged arc
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· In this study, high-basicity (1.5, 2.0, 2.5, 3.0 and 3.5) pellets were roasted in air at 1190°C, 1220°C, 1250°C and 1280°C, aiming to clarify the compressive strength, porosity, phase composition, microstructure and elemental distributions of high-basicity pellets. We also clarified the consolidation mode of pellets at high basicity and
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· Fig. 7 B: The compressive strength of pre-reduced pellets (y-axis), prepared from metallurgical grade chromite ore pre-oxidised at 1000 C that were subsequently oxidatively sintered at different temperatures (x-axis) in a normal atmosphere.
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· According to the compression testing results, carbonate rocks exhibited more substantial rock resistance than those of sandstone and shale rocks, distinguished by the largest uniaxial compressive strength (being 108.07 MPa), as shown in Fig. 2 a.
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· Effect of mass proportion of chromite concentrates on the compressive strength of the fired pellets. Conditions of raw materials: MP-no pretreatment; CMP-1, CMP-2, CP-HPGR pretreatment, the SSA value of pellet feeds are 1800–1900 cm 2 /g.
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Chromite and zirconia are common examples of widely used refractory materials and have a melting point of 1,700 to 2,000 C and well in excess of 2,000 C respectively. Mechanical or compressive strength rarely contributes to thermal conductivity.
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The compressive strength of the samples varied significantly from 5 kg/pellet to 305 kg/pellet. The microstructure of the sintered pellets revealed that the porosity and formation of liquid phase affects the compressive strength of the pellets. In addition of this the
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· The improvement in compressive strength and split tensile strength is shown in Fig. 10 and Fig. 11, respectively (Rajashekar and Reddy, 2015). From the results, it can be understood that the use of FCS as a complete replacement of natural aggregates can be materialised and implemented for construction works considering the mechanical
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Thus, according to the FactSage 6.1 calculation, and as shown in Fig. 3, addition of 10% CaO, 5% SiO2, and 10.8% C to the chromite ore is likely to produce 30% molten phase during sintering. The remaining 70% (solid phase) will be constituted by the high-melting MgCr2O4, MgAl2O4. and FeCr2O4.
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· Compressive strength of alkali-activated BFS-FA binder The main chemical composition of FA is SiO 2 and Al 2 O 3 , which are the main mineral components for preparation of cementitious materials. However, CaO contents are low, so the reaction requires high curing temperature to obtain high strength.
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· A statistical evaluation of the cured (sintered) compressive strengths proved that pellets prepared from UG2 ore are likely to have the same, or better, compressive strength than pellets prepared
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