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chromite compressive strength

chromite compressive strength

chromite compressive strength
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Solidification/stabilization of chromite ore processing · The compressive strength of the samples were measured according to Chinese National Standar

chromite compressive strength

  • Solidification/stabilization of chromite ore processing

    · The compressive strength of the samples were measured according to Chinese National Standard GB/T 176711999 (CNGB, 1999) on a universal testing machine (AGN250, Shimadzu, Japan) All samples were tested at an age of 28 d For each sample, the value of the compressive strength was averaged from three parallel pressive 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 (728 days), are selected as possible candidates affecting the compressive strength The modeling technique presented in this paper is based on 23Recycling Of Chromite Waste for Concrete: Full Factorial· The compressive strength results for the pellets prereduced up to 1250 the compressive strength of prereduced chromite pellets is enhanced significantly by the thin oxidised outer layer (Section 32) By comparison of the compressive strengths of the two case study clays, it is clear that the bentonite clay was superior in both prereducing and oxidative sintering environmentsUnique challenges of clay binders in a pelletised chromite

  • (PDF) Experimental Studies on Properties of Chromite

    KeyWords: Chromite sand, central composite design of experiments, compression strength, permeability 1 Introduction introduced for mould and core making These With the rapid developments in foundry industry, systems are called coldbox process, as the variety of resin bonded sand systems has been mould/core is allowed to cure at the room ISBN: 9781618041852 230 Recent Advances in· Based on the compressive strength, the optimum conditions for preparing blast furnace slagbased geopolymer (SG) were BFS/solid of 90 wt%, a water glass/NaOH mass ratio of 7:3, a liquidtosolid ratio of 025, and a BFS grinding time of 12 h The 28day compressive strength of the geopolymer was 504 MPa Chromite ore processing residue (COPRImmobilization of chromite ore processing residue with· 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 135 to 255, 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 When the Cr/Fe ratio was increased to 170, the strength ofValueadded utilization of waste silica powder into high

  • Improving the Pelletization of Chromite Concentrate by

    The compression strength of fired pellets was tested up to 269088 N per pellet by preheating at 1050°C for 10 min and by roasting at 1280°C for 12 min, which meets the demand of strength forKeyWords: Chromite sand, central composite design of experiments, compression strength, permeability 1 Introduction introduced for mould and core making These With the rapid developments in foundry industry, systems are called coldbox process, as the variety of resin bonded sand systems has been mould/core is allowed to cure at the room ISBN: 9781618041852 230 Recent Advances in(PDF) Experimental Studies on Properties of ChromiteDownload Citation | Compressive Strength and Creep Behavior of a Magnesium Chromite Refractory | The compressive strength of a magnesium chromite refractory in nitrogen was measured by rapidlyCompressive Strength and Creep Behavior of a

  • Valueadded utilization of waste silica powder into high

    · 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 135 to 255, 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 When the Cr/Fe ratio was increased to 170, the strength ofThe compression strength of fired pellets was tested up to 269088 N per pellet by preheating at 1050°C for 10 min and by roasting at 1280°C for 12 min, which meets the demand of strength forImproving the Pelletization of Chromite Concentrate by· The results showed that the higher the replacement of chromite industry waste (C), the lower the compressive strength of concrete at each curing age However, the addition of a small quantity of chromite industry waste (ie, 5%) has a negligible and adverse effect on concrete strength From the results, it revealed that chromite industry waste do not observe pozzolanic activityUse of selected industrial waste materials in concrete

  • v115n8a6 Comparison of physical properties of oxidative

    compressive strength than pellets prepared from metallurgicalgrade chromite ore The cured abrasion strength of the UG2 pellets was also superior to that of the metallurgicalgrade pellets Scanning electron microscopy (SEM) backscatter, secondary electron, and elemental Xray mapping were used to determine the reasons for the general superior strength of the UG2 pellets The case study UG2The properties of freshly prepared chromite alumina plastic mass and masses after storage for 1 and 3 months have been determined It is established that the mass after a 3month storage has better ultimate compressive strength, thermalexpansion coefficient, apparent density, and dynamic elastic modulusEffect of the storage time on the properties of plasticinvestigated for metallic ores such as chromite, haematite, galena, and smithsonite Uniaxial compressive strength, Brazilian tensile strength, impact strength, and smallscale cutting tests were carried out in the laboratory The SE values were calculated from the cutting tests and correlated with three different brittleness concepts A significant correlation could not be found between thev116n8a8 Estimating specific energy from the brittleness

  • (PDF) Development of Cold Bonded Chromite Pellets for

    Dwarapudi et al [8] recommends a minimum compressive strength of 50 daN/pellet for iron ore pellets used in arc electric furnace Therefore, 50 daN/pellet was the arbitrated resistance to approvePDF | Chromite ore processing residue (COPR) is a hazardous waste due to the presence of highly mobile Cr(VI) In this paper, the| Find, read and cite all the research you need on ResearchGate(PDF) Reduction/immobilization of chromite ore• Tensile strength of various sands (chromite, silica, olivine etc) can be measured by mixing with a foundry resin system and preparing 1 inch thick (254 cm) tensile specimens or “Dogbones” • The tensile specimens are prepared and allowed to cure for various amounts of time before measuring the tensile strength (30 minutes 4 hours, 24 hours etc) Curing can be done in ambientChromite Sand Testing Minerals Tech

  • Recycling Of Chromite Waste for Concrete: Full Factorial

    The objective of this study is to identify the significant factors and interactions involved in maximizing 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 (515%) and cure duration (728 days), are selected as possible candidatesTheir compressive strength ranges from 16 MPa for hematite to 36 MPa for chromite, and due to its lowest strength value hematite will not be used as coarse aggregate On the other hand, the tensile strength varies from 23 MPa (magnetite) to 41 MPa (chromite) The gamma (Ug) and neutron (Un) attenuation were taken as a measure for the concrete shielding that was tested using a total of 72The Role of Geology on the Radioactive Attenuation Using• Chromite (FeCr2O4), a black, angular sand, is highly refractory and chemically unreactive, and it has good thermal Compression Strength • Dry Compression Strength • Hot Compression Strength • Moisture (water) • Permeability • Flowability • Refractoriness • Thermal Stability • Collapsibility • Produces good casting finish • Mold Hardness • Deformation • IsSAND, SAND ADDITIVES and SAND PROPERTİES

  • Hot Compressive Strength and Deformation of Sand Mold

    Hot compressive strength and deformation of silica, olivine, zircon and chromite sand molds bonded by sodium silicate or bentonite were investigated Sodium silicate bonded sand mold have the maximum hot strength at 200°C and 500°C, and bentonite bonded sand molds have it at 900°C As sodium silicate and bentonite become soft above 500°C and 900°C, respectively, the sand molds deform· Under the optimal test conditions, the compressive strength of fired pellets with natural basicity is only 607 N/pellet, but the compressive strength of fired pellets reaches 1991 N/pellet at basicity of 115 The structure of fired chromiumnickel pellets at 115 basicity greatly depends on the liquid bonding phases among chromite, hematite and enstatite particles, which are composed ofEffect of basicity on the structure characteristics ofChromite pellets containing 3 wt% sodium silicate3 wt% SiO 21 to 4 M KOH solution and cured at 75°C for 24 h had compressive strengths of between 256 ± 044 and 312±01 kN, exceeding the compressive strength (154 ± 05 kN) of prereduced pellets obtained from a South African FeCr producer Furthermore, pellets cured at low temperatures did not indicate moisture susceptibility ThisSodium Silicate ColdBonded Chromite Pellets for the

  • FACTORS AFFECTING THE REDUCIBILITY OF SINTERED CHROMITE

    executed by stopping the pellet cooling at 1100°C for 60 minutes The temperatures needed for a compressive strength of 100 kp respectively of 200 kp varied dependi ng on the pelletizing mixture This also affected the oxidation of chromite iron [4] This phase of the study included 24 sintering cases Some differences in the pelletThe properties of freshly prepared chromite alumina plastic mass and masses after storage for 1 and 3 months have been determined It is established that the mass after a 3month storage has better ultimate compressive strength, thermalexpansion coefficient, apparent density, and dynamic elastic modulusEffect of the storage time on the properties of plasticSodium Silicate ColdBonded Chromite Pellets for the Ferrochromium Industry – Identifying a Suitable Process SP du Preez a* , Z Mareea , JP Beukes aNorthWest University, Faculty of Natural and Agricultural Sciences, Chemical Resource Beneficiation (CRB), Private Bag X6001, Potchefstroom, 2520, SouthAfrica Received: June 5, 2020; Revised: July 27, 2020; Accepted: August 4, 2020Sodium Silicate ColdBonded Chromite Pellets for the