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An Overview of Currently Applied Ferrochrome Production
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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Compressive strength of iron-ore pellets
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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Effects of water-cement ratio on bond strength of concrete
The compressive strength of concrete with varying w/c ratios at curing ages of 7, 14, 21, and 28 days is shown in Fig. 11. The results show that increasing the w/c ratio from 0.4 to 0.6 increases the compressive strength of the concrete. Furthermore, the compressive strength of each w/c ratio increases with curing age.
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Development of Chromite Sinter from Ultra-Fine Chromite …
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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Compressive strength and composite pore structure parameters …
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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Compressive Strength and Thermal Properties of Ferro Coke …
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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Estimating effect of chrome ore granulometry on sintered pellet
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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Prediction model of compressive strength of ed concrete …
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 ing agent type ...
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Factors affecting compressive strength of steel slag concrete: A
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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Studies on the Mechanical and Physical Properties of …
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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Effects of iron ore tailings on the compressive strength and
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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Novel Additives to Improve Sintering Characteristics of Indian Chrome
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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Mechanism of thermal compressive strength evolution of carbon …
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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(PDF) Effect of molasses binder on the physical and mechanical
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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Novel Additives to Improve Sintering Characteristics of Indian Chrome
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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Cold compressive strength of iron ore pellets in distinct reduction
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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Compressive strength, durability, and resilient modulus of cement
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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Development of new heavy concretes containing chrome-ore for …
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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Open Access proceedings Journal of Physics: Conference …
compressive strength of geopolymer mortar containing laterite soil and slaked lime M Sayfullah S, L O A Suherman, S Salam et al.- ... nickel ore have been carried out and are related to the effects of phases on the reduction and formation of nickel metal particles. For example, Krasuk et al. [9] studied the reduction of nickel oxide with CO, ...
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Effect of basicity on the structure characteristics of chromium …
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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What is the composition of magnesia chrome brick?
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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Crushing in Mineral Processing
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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Preparation of Oxidized Pellets with Chrome Ore
Strength Introduction Chromite ore is an essential raw material for producing Cr–Fe alloy, which is ... Table 1 Chemical composition analysis of chrome ore (wt/%) Material Cr 2O 3 Fe 2O 3 FeO CaO SiO 2 Al 2O 3 MgO TiO 2 V 2O 5 LOI a Chromite 41.84 – …
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Effect of Gangue Distribution on Compressive Strength of Iron Ore …
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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Hydrogen-based pre-reduction of chromite: Reduction and …
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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CN117230305A
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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Development of high-strength ceramsite via sintering of iron ore
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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Development of Chromite Sinter from Ultra-Fine Chromite …
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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Evaluation of compressive strength and shear strength of the …
Compression strength of green pellets would increase from 10.5N.P-1 to 12.61N.P-1. ... in order to provide the theory basis and technical parameters for sintering and ore proportioning of high ...
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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 …
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