compressive strength of chromite
Chromite Sand Testing
Typical Chromite Sand Testing • South African Chromite Sand is the world standard for metalcasting and foundry applications, however there can ... • Transverse tensile strength and compressive strength can also be measured and is more commonly seem in Europe and Asia. Gauge on tensile testing equipment and standard AFS tensile specimens .
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Solidification/stabilization of chromite ore processing …
Chromite ore processing residue (COPR) was obtained from a chemical plant in Chongqing, China. Ordinary Portland cement (OPC) used in the experiments was from a cement plant in Chongqing, China. The chemical composition of raw materials is listed in Table 1. Alkali activators. Compressive strength of alkali-activated BFS-FA …
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Methane–Hydrogen-Based Pre-reduction Chromite
DOI: 10.1007/s11837-024-06707-y Corpus ID: 270573937; Methane–Hydrogen-Based Pre-reduction Chromite: Reduction Behavior and Pellet Compressive Strength …
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Methane–Hydrogen-Based Pre-reduction Chromite: …
This study has focused on reducing the carbon emissions and energy consumption for producing ferrochrome, an essential component in stainless-steel …
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Study the effect of chromite ore properties on pelletisation process
At 11% moisture content the desired grade pellets were obtained. These pellets were kept in the carbolite furnace at an average heating rate of 20 °C/min and were retained for 1 h at 1300 °C for heat treatment. Then the naturally cooled pellets were collected and divided in two parts for compressive strength and porosity tests. 3. …
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Empirical Estimation of Uniaxial Compressive Strength of …
The uniaxial compressive strength (UCS) is a mechanical property of intact rocks that is important in civil and mining engineering works (Aladejare 2020; Aladejare et al. 2020; Wang and Aladejare 2016a).Design and stability analysis of underground excavations and other geotechnical structures require the input of data like UCS on the …
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Preparation and application of alkali-activated cementitious …
Chromite ore processing residue (COPR) is a typical hazardous waste, ... According to the optimal conditions of the single-factor experiment, the highest compressive strength of 147.6 MPa was obtained after using the water glass modulus 1.0, liquid–solid ratio 0.28, alkali–solid content 8%, curing temperature 45 °C. ...
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Research on the environmental stability performance of …
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, ... The compressive strength of the solidified specimens in the control …
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Methane–Hydrogen-Based Pre-reduction Chromite
DOI: 10.1007/s11837-024-06707-y Corpus ID: 270573937; Methane–Hydrogen-Based Pre-reduction Chromite: Reduction Behavior and Pellet Compressive Strength @article{Wu2024MethaneHydrogenBasedPC, title={Methane–Hydrogen-Based Pre-reduction Chromite: Reduction Behavior and Pellet Compressive Strength}, …
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The Utilization of Alkali-Activated Lead–Zinc Smelting Slag …
As the COPR content increased, the peak strength of the main crystalline phase magnesium chromite gradually increased, which may have led to incomplete dissolution of aluminosilicate, thus hindering the condensation reaction and leading to a decrease in compressive strength .
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Compression strength of pellets under wet and dried …
Download scientific diagram | Compression strength of pellets under wet and dried conditions. from publication: Binder Behavior on Chromite-Carbon Composite Pellets | The influence of binders on ...
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The reduction of chromite ore processing residues by green …
The synthesize nano zerovalent iron by green tea (GT-NZVI). • Reduction of chromium existed in chromite ore processing residues (COPR) by GT-NZVI.. Significant results are achieved regarding compressive strength and Cr (VI) solidification.. Comparatively, GT-NZVI treated COPR has better solidification than untreated COPR.
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Research on the environmental stability performance of chromite …
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(vi). Therefore, ascorbic acid (AA) and blast furnace slag (BFS) have been used to detoxify and solidify COPR. ... However, in the freeze–thaw cycle experiments, the compressive strength of the solidified bodies consistently remained …
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Research on the environmental stability performance of chromite …
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(vi). Therefore, ascorbic acid (AA) and blast furnace slag (BFS) have been used to detoxify and solidify COPR. ... However, in the freeze-thaw cycle experiments, the compressive strength of the solidified bodies consistently remained …
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Research on the environmental stability performance of chromite …
PDF | 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 ...
ادامه مطلبPrediction of Uniaxial Compressive Strength of Rocks from …
Rock engineering tasks like tunnelling, dam and building construction, and rock slope stability rely heavily on properly estimating the rock's uniaxial compressive strength (UCS), a crucial rock geomechanical characteristic. As high-quality specimen are not always possible, scientists often estimate UCS indirectly. The primary objective of …
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Detoxification and immobilization of chromite ore …
Modulus refers to the mole ratio of SiO 2 and Na 2 O in the alkali activators (water glass and sodium hydroxide). The compressive strength increased with increment of modulus up to a certain value, and further increase caused the decline in strength which could be seen in Fig. 1 (a).Highest compressive strength of 112.92 MPa was observed …
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Preparation and application of alkali-activated cementitious …
Chromite ore processing residue (COPR) is a typical hazardous waste, ... on compressive strength was investigated by single-factor experiment. Additionally, solidification effect of AACM was determined according to the compressive strength and the leaching concentration of chromium (Cr ...
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Utilisation of pre-oxidised ore in the pelletised chromite pre
For improving the consolidation strength of chromite pellets with high Cr/Fe ratio of 2.55, industrial waste silica powder was innovatively applied as the additive to facilitate the pellet consolidation. Results showed that with the dosage of silica powder increasing, the drop number of green balls was enhanced obviously, while the …
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Unique challenges of clay binders in a pelletised chromite …
The compressive strength results for the pellets pre-reduced up to 1250 °C for 20 min (containing anthracite and pre-reduced under N 2), as well as oxidative …
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Compressive strength of stone
The compression strength of the stone is carried out to determine the compressive strength of the stone. To perform this test take 6 test blocks of dimensions 10cmx10cmx10cm are taken. These blocks are then covered with plaster of Paris subjected to load in the compression testing machine one by one.
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Detoxification and immobilization of chromite ore processing …
The product prepared has a relatively high compressive strength. Abstract. Chromite ore processing residue (COPR), a waste produced in high lime chromium salt production process using chromite, contains a fraction of leachable Cr(VI) which is harmful to humans and environment. It is of great emergency to solve the pollution of residues ...
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Hydrogen-based pre-reduction of chromite: Reduction and …
(a) Compressive strength machine; (b) samples stage; (c) pellet sample; (d) schematic diagram of compression test. The detection method of iron valence state is as follows. First of all, a weak acid, o-phenanthroline-ammonium chloride, is employed to …
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Minerals | Free Full-Text | An Overview of …
Chromite briquettes have lower compressive strengths and lower Cr recovery during smelting when compared to sintered/pre-reduced pelletized chromite . Thus, only pelletization processes were …
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Research on the environmental stability performance of chromite …
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(vi). Therefore, ascorbic acid (AA) and blast furnace slag (BFS) have been used to detoxify and solidify COPR. ... The compressive strength of the solidified specimens in the control group reached a maximum value (99.21 MPa) after …
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Research on the environmental stability performance of chromite …
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 value (86.91 MPa) after 50 freeze–thaw cycles. Moreover, the compressive strength of the solidified bodies after the other numbers of cycles did not change significantly (<4%).
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Optimizing chromite reduction through carbon and …
Fig. 6 (a) shows the average pellet compressive strength under different carbon contents and reducing atmospheres. The results indicate that as the carbon …
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Insight into the Consolidation Mechanism of Oxidized Pellets …
When more chromite concentrate is blended, the weak bonding among the chromite particles gradually becomes the dominant factor, which will lead to the decrease of the mechanical strength of fired pellets. ... The cold compressive strength of two fired pellets for the following tests is higher than 2500 N/pellet, and their chemical …
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Estimation of compressive strength of various stones based …
This work examines the compressive strength of natural stones, as estimated by Uniaxial compressive strength tests (UCS) and respective non-destructive tests results (Schmidt Hammer Rebound test, SHR, or an Ultrasonic Pulse Velocity transmission, UPV). In practice, aiming to correlate the values of the UCS test with the results of the NDT …
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Recycling Of Chromite Waste for Concrete: Full Factorial …
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 selected as possible candidates affecting the compressive strength.
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