The rock's compressive strength; The ore clay content; ... The most common abrasion test however, is the Bond method where a 76x25x6mm (3x1x0.25″) piece of 500 Brinell SAE 4325 chrome-nickel-molybdenum steel rotates in a falling stream of rocks under standard predetermined conditions to measure its weight loss. The resulting Ai is used to ...
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Fused-cast magnesia-chrome bricks are refractory products made from magnesia and chrome ore through electric melting and casting. ... Cr2O3 16.45%, SiO2 2.75%, apparent porosity 13%. Compressive ...
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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% sodium ...
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This study is conducted to find suitable additives to improve chrome ore pelletization and pellet properties. Two types of additives (carbonaceous heating additives and …
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Granulometry of the chromite fines used for pellet production is an imperative enabler which controls the pellet strength and porosity by packing of particles and formation of …
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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 ...
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The compressive strength of UHPC mainly depends on the close packing density and hydration of cement as well as the pozzolanic reactions of mineral ... The addition of iron ore tailings enhances the compressive strength and impermeability of UHPC mortars due to the filling effect of IOT and the pozzolanic reaction of part of the finer IOT when ...
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Keywords—sand; iron ore tailing; compressive strength; flexural strength; reinforced concrete beam I. INTRODUCTION The increasing demand for heavy construction material like steel and iron has resulted in the establishment of many iron ore mining companies. Iron ore tailing is a waste generated from the iron ore industry (vide Figure 1).
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Compressive strength (OST 14-3-72) is regarded as one of the principal criteria of suitability of roasted iron- ore pellets for metallurgical processing. One of the machines at the Sokolovsko-Sarbaisk combine (SSGOK) was used to study the effect of the roasting
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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
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A method of producing sodium chromate from chromite ore, which involves mixing the ore with sodium carbonate and a refractory diluent, pelleting the mixture using an aqueous solution of …
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The effect of chromite ore granulometry and sintering process parameters was evaluated to improve the metallurgical performance of pellets in a submerged arc furnace. The …
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Drying and roasting behavior of iron ore pellets with microwave and conventional heating have been comparably investigated. The results showed that the dehydration time of green pellets can be shortened by approximately two-thirds with microwave heating. Meanwhile, the average compressive strength of pellets with organic binders dried by microwave heating …
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Chrome ore properties play a critical role in various pelletisation subprocesses (grinding, filtering, pelletisation and sintering) and slight variation in ore properties significantly affect the whole pelletisation process. Three ore samples (sample-A, B and C) were collected from different working faces of a chromite ore mine. Experiments were carried out to find out …
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Compressive strength, durability, and resilient modulus of cement-treated magnetite and hematite iron ore tailings as pavement material ... Strength and durability of iron ore tailing materials stabilized using Portland Cement as base materials: a case study of Golgohar mine. J. Transp. Infrastruct. Eng., 7 (2021), pp. 101-122, 10.22075/jtie ...
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The effects of composition, grain size of chromite fines and recycled fines on the compressive strength of the fired and pre-reduced pellets in varying diameters were studied. 6,7) The possibility of pre-reduction of a variety of chromite ores with a low-grade carbonaceous reductant was also examined. 8) These studies have shown that pre ...
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Strength tests were carried out of new heavy concretes in pressure 30 MPa. Strength values were calculated by usin equation 3 and there sults shown that in Table 8. There sults obtained showed that the new heavy concretes had a compressive strength close to the commonly used C25-30 concretes (Cui et al., 2017). These values are accepted in the ...
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Against the background of "carbon peak and carbon neutrality," it is of great practical significance to develop non-blast furnace ironmaking technology for the sustainable development of steel industry. Carbon-bearing iron ore pellet is an innovative burden of direct reduction ironmaking due to its excellent self-reducing property, and the thermal strength of …
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Mineral resources is important to economic development, whereas tailings are regarded as low-value products that cannot be utilized after beneficiation operation, which incurs serious harm to the environment [1], [2].Among them, the utilization of iron tailings is a hotly studied topic [3].Cai et al. [4], [5] studied the effect of iron tailings on the workability and …
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Cold compressive strength (CCS) of the original test pellets was measured using an apparatus described in ISO 4700, which considers the determination of crushing strength for iron ore pellets. For individual original pellets, a CCS result of more than 150 daN can be considered acceptable, and a result of less than 60 daN is very weak [8]. The ...
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Ferrochrome slag is a by-product of the production of ferro-chrome alloy, an essential component in stainless steel. The conventional process of ferrochrome making involves the carbothermic reduction of chromite ore where around 1.2–1.5 tons of slag containing approximately 8–12% of chromium oxide is generated per ton of hot metal (Jena and …
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Strength and durability of iron ore tailing materials stabilized using Portland Cement as base materials: a case study of Golgohar mine. J. Transp. Infrastruct. ... the compressive strength was strongly correlated with the ratio of porosity to volumetric cement-content, and IOT-cement (5 % and 10 %) mixtures displayed suitable durability ...
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The increase in compressive strength is found to be highly appreciable above the temperature of 1373 K. The increase in compressive strength up to 1373 K is expected to be due Fig. 2 Effect of firing temperature on compressive strengths of fired OMC hematite iron ore pellets prepared with different binders: firing time—a 1h,b 2 h and c 3h 123
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Compressive strength of chrome ore tandartsderikxnl chrome ore crusher compressive strength specifiions impact crusher ore processing impact crusher is suitable for materials whose compressive strength is under 350mpa and particle size is less than 500mm with end products in cubic shape the impact crusher is widely used for sand and rock ...
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Compressive strength. Wet and oven-dried pellets were subjected to the compressive strength test by using Instron 5569 with a maximum capacity of 10 kN. The load required to fracture the pellet was considered as the compressive strength of the pellet. At least 10 samples of a particular iron ore composition were tested.
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Unsintered ceramsite have a lower strength relative to sintered, Liqun Luo sintered bricks with a compressive strength of 14.24 MPa, produced from shale, sewage sludge, coal gangue powder, and iron ore tailings; Ranfang Zuo investigated sintering bricks with a compressive strength of 21.79 MPa, produced with iron tailings, along with clay, coal ...
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A novel ambient condition production of superior strength, non-abrasive, non-sticky iron ore pellets devoid of undesirable fines under the compression stress of 4 kN is presented.
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2.5. Compressive Strength of Ferro Coke The compressive strength of ferro coke was determined using a pellet ore pressure tester (Anshan Kexiang QTY-10000). The average of ten samples was used as the test result for that sample. 2.6.Reactivity and Strength after Reaction of Ferro Coke A vertical tube furnace (Fig. 2) was used to test the dis-
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The invention discloses a method for improving compressive strength of chrome ore powder pellets, which comprises the following steps: the invention prepares chrome ore pellets by …
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Compressive Strength Test. IS 3495 (Part-1): 2019 lays down the following procedure to determine the compressive strength of burnt clay bricks. ... These bricks are prepared from a mixture of chrome, iron ore, ferrous oxide, bauxite and silica. Such bricks are unaffected by acidic or basic actions. (b) ...
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Hardened concrete has a very high compressive strength. The durability of hardened concrete is higher than other building materials, and consequently maintenance operations and costs are less. It shows a very good adherence with concrete steel reinforcements (Hamad, 2014).
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From the gathered compressive strength data, two groups of concrete according to ACI 211 [158] were classified, namely normal-strength concrete (NSC) with the compressive strength below 6000 psi (41.37 MPa) and the other group with that higher than 6000 psi considered as high-strength concrete (HSC). As a result, 342 and 228 data were found on ...
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The chrome ore sinter thus produced was found to be inferior in strength, comparable to that of an iron ore sinter, but strength requirements may not be the same for both.
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Table 3: Summary of Compressive Strength Test Results Samples Compressive Strength @ 7-days @ 14-days @ 21-days @ 28-days A 10.70 14.64 17.64 19.22 B 7.50 11.44 14.44 16.02
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EPMA/EDS. The developed sinter was found to possess adequate handling strength that would be well acceptable to produce ferrochrome in the SAF. KEY WORDS: chromite ore fines; pot …
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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 swelling ...
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The firing performance of the chromium-nickel bearing iron ore pellets is greatly improved by increase in quaternary basicity, much higher compressive strength of the fired …
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The pellets formed are tested for compressive strength using a compression tester, model LPCM, John Chatillon and Son, New York, NY. In each instance, about 10 pellets are tested in order to obtain an average figure. The pellet formed by the method given above are tested for compressive strength when first formed and after drying at 200C.
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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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Based on the findings in Fig. 5, the compressive strength decreases with higher Fe metallization, possibly due to the reduced binder quantity and the oversized metal Fe grains. …
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