Solidification/stabilization of chromite ore processing ...

2017-2-1  Compressive strength measurement. The compressive strength of the samples were measured according to Chinese National Standard GB/T 17671-1999 (CN-GB, 1999) on a universal testing machine (AGN-250, 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 ...

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Compressive Strength and Creep Behavior of a Magnesium ...

The compressive strength of a magnesium chromite refractory in nitrogen was measured by rapidly loading specimens to failure at several temperatures up to 1600 O C. Strength retrogression was observed at temperatures above 1200°C. The creep behavior of the refractory in nitrogen was measured as a function of compressive stress in the range from 1.4 to 5. 6 MPa and as a function of temperature ...

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Detoxification and immobilization of chromite ore ...

2014-3-1  The compressive strengths of MGCSx specimens are shown in Fig. 2. The compressive strength of pure MG is 65 MPa. With the molar ratio of S 2− /Cr(VI) increasing from 4 to 10, the compressive strengths of MGCSx specimens decrease from 59 MPa to 42 MPa . Therefore, the addition of Na 2 S reduces the compressive strength of MGCSx specimens.

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Reduction/immobilization of chromite ore processing ...

2018-2-15  Chromite ore processing residue (COPR) is a hazardous waste due to the presence of highly mobile Cr(VI). In this paper, the reduction/immobilization of COPR using composite materials (fly ash, blast furnace slag and metakaolin) based geopolymer coupled with zero-valent iron (ZVI) was investigated. ... Compressive strength is a widely used ...

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The Effect of Carbonaceous Reductant Selection on

2017-4-1  cured compressive strength of pelletized chromite. pre-reduced pellets, which is indicated in Figure 2 (on. the primary y axis). The pre-reduction levels achieved.

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v115n8a6 Comparison of physical properties of oxidative ...

2015-9-10  compressive strength than pellets prepared from metallurgical-grade chromite ore. The cured abrasion strength of the UG2 pellets was also superior to that of the metallurgical-grade pellets. Scanning electron microscopy (SEM) backscatter, secondary electron, and elemental X-ray

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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.

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(PDF) Briquetting Fine Chromite Concentrates

The results demonstrate that compressive strength values of about 196 and 182 MPa after two days of hot curing can be achieved when replacing 50% and 100% of QS with GS, respectively, compared to ...

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Compressive behaviour of dry joints in refractory ceramic ...

2021-7-29  compressive stress-strain curves between 30 and 70% of the material strength (maximal stress registered on the loading curve). In the magnesia-chromite bricks both bigger grains and the matrix are produced from chromite ore with addition of MgO [10].

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Strength evaluation by using polycarboxylate ...

2018-7-1  The compressive strength of all samples had decreased after addition of heavy metals but still much higher than standards strength required for landfill (>0.35 MPa) and construction purposes (10 MPa). Additionally, increase in heavy metals, concentrations had decreased the compressive strength and hence leaching of heavy metals increased.

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compressive strength of chrome ore

Chromite Compressive Strength. Compressive Strength For Iron Ore For Cone Crusher Compressive strength copper ore ilgiardinosullago.It.Compressive strength copper ore mining company including granite,basalt,limestone,river stone,sandstone,shale,iron ore,copper ore,etc iron ore impact crushing plant is the worlds widely used crusher, for mineral whose compressive strength is no more than .

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The Effect of Carbonaceous Reductant Selection on

2016-12-27  Impermeability of the furnace bed traps evolving process gas, which can lead to the so-called bed turnovers or blowing of the furnace that could have disastrous consequences.[10,47] It was therefore important to determine the influence of the different reducing agents on the cured compressive strength of pelletized chromite pre-reduced pellets ...

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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.

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v115n8a6 Comparison of physical properties of oxidative ...

2015-9-10  compressive strength than pellets prepared from metallurgical-grade chromite ore. The cured abrasion strength of the UG2 pellets was also superior to that of the metallurgical-grade pellets. Scanning electron microscopy (SEM) backscatter, secondary electron, and elemental X-ray

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[Solidification/Stabilization of Chromite Ore Processing ...

The results showed that after reduction, all of the S/S treated COPR samples met the pollution control limit of bricks and building block products (Chinese standard HJ/T 301-2007) produced with COPR for total Cr (0.3 mg x L(-1)), the compressive strength of all the S/S samples could meet the compressive strength standard (15 MPa) for producing ...

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Chromite Sand Testing - Minerals Tech

2021-3-16  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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(PDF) Briquetting Fine Chromite Concentrates

The results demonstrate that compressive strength values of about 196 and 182 MPa after two days of hot curing can be achieved when replacing 50% and 100% of QS with GS, respectively, compared to ...

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Comparison of the Oxidation Behaviors of High FeO

2016-8-4  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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FACTORS AFFECTING THE REDUCIBILITY OF SINTERED

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.

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Compressive behaviour of dry joints in refractory ceramic ...

2021-7-29  compressive stress-strain curves between 30 and 70% of the material strength (maximal stress registered on the loading curve). In the magnesia-chromite bricks both bigger grains and the matrix are produced from chromite ore with addition of MgO [10].

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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.

Get Price

The Effect of Carbonaceous Reductant Selection on

2016-12-27  Impermeability of the furnace bed traps evolving process gas, which can lead to the so-called bed turnovers or blowing of the furnace that could have disastrous consequences.[10,47] It was therefore important to determine the influence of the different reducing agents on the cured compressive strength of pelletized chromite pre-reduced pellets ...

Get Price

Chromite Sand Testing - Minerals Tech

2021-3-16  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 ...

The results showed that after reduction, all of the S/S treated COPR samples met the pollution control limit of bricks and building block products (Chinese standard HJ/T 301-2007) produced with COPR for total Cr (0.3 mg x L(-1)), the compressive strength of all the S/S samples could meet the compressive strength standard (15 MPa) for producing ...

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The Role of Geology on the Radioactive Attenuation

2012-6-17  chromite aggregate. The compressive strength values of the specimens of hematite aggregate were lowest (Fig. 2) because the ore is essentially quite brittle due to its oolitic nature. It might be more useful to use it as fine aggregate replacing sand rather than to be used as coarse aggregate.

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FACTORS AFFECTING THE REDUCIBILITY OF SINTERED

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.

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Sodium Silicate Cold-Bonded Chromite Pellets for the ...

Chromite pellets containing 3 wt% sodium silicate-3 wt% SiO 2-1 to 4 M KOH solution and cured at 75°C for 24 h had compressive strengths of between 2.56 ± 0.44 and 3.12±0.1 kN, exceeding the compressive strength (1.54 ± 0.5 kN) of pre-reduced pellets obtained from a South African FeCr producer. Furthermore, pellets cured at low temperatures ...

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Compressive behaviour of dry joints in refractory ceramic ...

2021-7-29  compressive stress-strain curves between 30 and 70% of the material strength (maximal stress registered on the loading curve). In the magnesia-chromite bricks both bigger grains and the matrix are produced from chromite ore with addition of MgO [10].

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Compressive creep of basic refractories

2020-10-13  and.adjacent chromite grains with well dispersed large voids.5 The periclase - chromi te direct bond is considered due to the interdiffusion and reaction . of . RO and R2. o. 3 . compounds such as MgO, cr. 2. o. 3, and Fe2. o. 3• Direct bonded basic refractories have good chemical durability, i.e., slag resistance, and mechanical strength at ...

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USE OF FERROCHROME SLAG AS AGGREGATE IN

2018-11-30  4.2.2 Compressive Strength Due to the inclusion of water cooled ferrochrome slag compressive strength decreased. For 10-50% of WCFS, the compressive strength decreased by 2-14% in 28 days, 1-16% at 91 days and 2-16% in 180 days. There is an increment in compressive strength with curing period. The increase in

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