thermal compressive strength of pellet was tested and automatically recorded by the data acquisition system. For each test, ten pellets were measured, and the average value was used as the final experimental result. 2.3 Characterization methods Mechanism of thermal compressive strength evolution of carbon-bearing iron ore pellet without…

The effects of oolitic haematite ore additions on the compressive strength of iron ore pellets were investigated in a preliminary study. It was found that additions of oolitic haematite at levels of up to 15% by mass decreased the compressive strength from about 3250 N to 1729.1 N, which is below the minimum requirement of 2500 N for use in a ...

 — The compressive strength of fired chromium-nickel bearing pellets only increase from 383 N/pellet to 516 N/pellet when the fired temperature is elevated from 1230 °C to 1320 °C, as shown ... Chrome ore beneficiation challenges & opportunities-a review[J] Miner. Eng., 24 (5) (2011), pp. 375-380.

 — In this experimental work, the effect of replacing sand partially or completely in cement concrete by iron ore tailing, which is a waste from the iron ore industry and which has disposal problem leading to environmental pollution, is investigated. Cement concrete cubes and reinforced concrete beams are tested for compressive strength and flexural …

 — It was found that the compression strength was increased for 10 T, and thereafter, it was reduced gradually. But, up to 30 T the compression strength was above 38.25 N/mm 2. It was observed that the compression strength increased by 27.24% for 10 T; where for 20 T and 30 T compression strength was increased by 11.355% and …

In general, compared to intact rock, a rock mass has reduced tensile strength (almost zero), and reduced shear strength especi ally along discontinuity planes. Furthermore, if a rock …

 — High MgO content and the dehydroxylation of laterite ore particles lead to poor compressive strength of fired chromium-nickel bearing iron ore pellets at natural basicity.

 — The compressive strength, metallization rate and dezincification rate of metallized pellets reached 1361N, 97.44% and 95.67%, respectively. ... K. Recycling of blast furnace dust in the iron ore ...

 — Estimating effect of chrome ore granulometry on sintered pellet properties. Ironmak. Steelmak., 35 (2007), pp. 27-32. CrossRef Google Scholar ... A study on plasticity and compression strength in wet iron ore green pellets related to real process variations in raw material fineness. Powder Technol., 181 (2008), pp. 321-330.

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 …

The effects of fly ash on the compressive strength, pore size distribution and chloride-ion penetration of recycled aggregate concrete were investigated. Two series of concrete mixtures were prepared. The concrete mixtures in series I had a water-to-binder ratio and a cement content of 0.55 and 410 kg/m3, respectively. The concrete mixtures in series II …

Mean tensile strength and compressive strength for selected sedimentary rock types (after Johnson and Degraff, 1988). The behavior of intact rock in the post-peak dom ain is not a true rock property and is partially dependent on the stiffness of the loading system. A testing machine consists of an assembly of

 — 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 ...

 — The world reserves of iron ore are around 170 billion tons. More than 2.4 billion tons of iron ore were processed in 2019, in which 36.7% correspond to the world's largest producer, Australia ...

 — More recently, Pariser et al. (2018) reported that South Africa accounted for 60% of the global chrome ore (i.e., chromite) output in 2018 . Nevertheless, the growth in the FeCr industry is paralleled by chromite mining. ... Figure 15 shows pellets with a compressive strength of 3.12 ± 0.10 kN were produced using a combination of 3 wt% …

 — 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 …

DOI: 10.1080/08827508.2023.2212115 Corpus ID: 258818400; Compressive Strength Behavior of Briquettes Produced from Manganese Ore Fines and Metal Dust: Optimization Using Response Surface Methodology

 — It was found that the iron ore tailings may be utilised for complete replacement for conventional aggregates in concrete. The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength, there was an improvement of 11.56% over conventional aggregates concrete.

 — Effect of iron ore tailings on the compressive strength exposed to thermal cycles at (a) 200 • C; (b) 400 • C; (c) 800 • C; (d) compressive strength for each composition at different target ...

 — Refractoriness of chrome minerals imposes challenges during chrome ore pelletization process. This study is conducted to find suitable additives to improve chrome ore pelletization and pellet properties. ... Cryolite dosing between 0.25% to 2% in pellet mix improved pellet compressive strength by 190% (63 to184 kgf) and reduced pellet …

 — The strength data were obtained from each experiments group. The compression tests were made at a speed of 1 mm/s until the pellet was broken down. A …

 — The rock uniaxial compressive strength (UCS) is the basic parameter for support designs in underground engineering. In particular, the rock UCS should be obtained rapidly for underground engineering with complex geological conditions, such as soft rock, fracture areas, and high stress, to adjust the excavation and support plan and ensure …

chromite fines and recycled fines on the compressive strength of the fired and pre-reduced pellets in varying diameters were studied.6,7) ... ity chrome sinter using the Indian chromite ore fines, which will be suitable for cold handling and easy smelting in the electric arc furnace, producing ferrochrome as the final

 — The drop test, compressive strength and porosity of sintered pellet samples from plant and laboratory tests were evaluated. Mathematical correlations of the pellet …

 — Pellets are one of the principal raw materials of blast furnaces 1,2,3 and have the advantages of high total iron content, less gangue content, high compressive strength and uniform particle size. 4 Compared with sinter production, pellets have lower energy consumption and produce less pollution. When pellets are used for …

Chromite ore has a spinel structure with a general formula of (Fe,Mg)O.(Cr,Al,Fe) 2 O 3. The content of Cr 2 O 3 for metallurgical-grade chromite ore is in the range 42–55% and the chromium-to-iron ratio is higher than 1.5. These quantities determine the chromium content in the smelted chromium ferroalloys.

Compression strength (daN/p) 250 min: Size distribution (+8mm to -18 mm) 95 % min: Size distribution (-5 mm) 1.50 %: Porosity: ... The strength of iron ore pellets is important in minimizing degradation by breakage and abrasion during handling and shipping, and in the blast furnace. Strong bonding in pellets is believed to be due to grain ...

 — The compressive strength was then determined from the six broken pieces left from the flexural test. The loaded area was 40 × 40 mm and the loading rate was 2.4 kN/s. Fig. 5 shows the compressive strength results of two curing ages. Download: Download high-res image (179KB) Download: Download full-size image; Fig. 5.

 — In the chrome ore pelletisation process chromite ore along with 4–5% coke is milled in the wet ball mill and filtered ore cake is mixed with bentonite and used for …

 — The compressive strength of sample F660-0.50-PS# (PS ing agent type) was 3.89 MPa, while the sample F660-0.50-OP# (OP ing agent type) was only 2.16 MPa. The compressive strength of specimens with different ing agent types showed an apparent difference. By contrast, the smaller pore size characteristic of PS …