Preparation of pellet powder raw materials. The iron concentrate powder, flux and bentonite used to prepare pellets powder raw materials are from a Chinese iron and steel company, and their ...
The present work illustrates the effect of limestone and dolomite as flux material in pelletization of an Indian goethetic-hematite iron ore with 59.75% Fe, 4.52% …
What is iron ore pellet. Iron ore pellets are made by adding a small amount of additives to the fine ore powder (-200 mesh, that is, the ore powder with a particle size of less than 0.074mm accounts for more than 80%, and the specific surface area is more than 1500cm2/g), adding water to the pelletizer, relying on capillary force and mechanical …
From the results it is evident that acid pellets reduction and they soften and melt later [9]. Acid pellets (without any added flux) exhibited highest swelling among showed high reduction degradation due to the presence of all the pellets. In case of limestone pellets, high swelling more hematite bonds and less silicate bonds.
In this study, the effect of finely ground dolomite and limestone on the metallurgical properties (green pellet drop strength, cold compression strength, reduction swelling index, and microscopic mineral …
Abstract. Indian iron ore fines with high alumina content (~2.5% Al 2 O 3) resulted in poor quality pellets and a study was under taken to establish suitable pellet chemistry through proper fluxing …
DOI: 10.1016/j.powtec.2020.10.063 Corpus ID: 226333476; Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore @article{Prusti2020EffectOL, title={Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore}, author={Pallishree Prusti and Kashinath Barik and Nilima Dash and S. K. Biswal …
Figure 7. Ring formation mechanism of magnesian flux pellets in rotary kiln. gradually increased, and iron olivine phase gradually became calcium iron olivine phase with lower melting point. (3 ...
The quality of the pellet is affected by the type of the raw materials, gangue content, and flux proportion and their subsequent treatment to produce pellets. The limestone addition, i.e. basicity–CaO/SiO2 of pellet decides the mode, temperature and the amount of melt formed. ... largely governed by the other additives like bentonite ...
The green properties of pellets with limestone plus bentonite (Gr. Code: A3) and calcined lime (Gr. Code: B1) is shown in Table 8. Calcined lime pellet shows higher green compressive strength and drop strength than the limestone added pellet though no bentonite has been used. This is because of the hydration of calcined lime form Ca(OH) 2.
With the increase of the content of finely ground dolomite and limestone in the pellet, the cold compression strength of the roasted pellets decreased. When the basicity was between 0.54 to 1.14, under the same basicity, the cold compression strength of the pellets with dolomite flux was greater than that of the pellets with limestone.
CaO and MgO bearing fluxes are widely used in sinters and pellet to improve their basicity and other properties viz. strength and physico-chemical properties especially, for lowering reduction degradation index of high alumina ore agglomerate. Limestone (CaCO3 mineral) is presently used as CaO input in agglomeration. Endothermic …
fluxed pellets were evaluated in Refs.[10−13], and suitable basicity and MgO content were also assured. Conclusions were established that limestone, dolomite, magnesia and so on could be used to make a fluxed pellet that had superior metallurgical properties relative to conventional acid pellets[14−16]. But there was lacking
The mineralogical composition difference between low-silica magnesia flux pellets (SiO2=3.5%) and high-silica magnesia flux pellets (SiO2=7.0%) at different temperatures is caused by a large ...
Preparation of pellet powder raw materials. The iron concentrate powder, flux and bentonite used to prepare pellets powder raw materials are from a Chinese iron and steel company, and their chemical composition is shown in Table Table1. 1.According to the actual production of the pellet plant, five kinds of pellets powder with different basicity (R …
The mineralogical composition difference between low-silica magnesia flux pellets (SiO2=3.5%) and high-silica magnesia flux pellets (SiO2=7.0%) at different temperatures is caused by a large ...
Six additives, i.e., limestone, lime, magnesite, magnesia, dolomite and light-burned-dolomite, were added for investigating their influences on the pellet quality. For green balls, adding lime and light-burned-dolomite makes the wet drop strength decrease firstly, and then increase with further increase of additive dosage. Ca(OH)2 affects the …
magnetite concentrate), fluxes (limestone and dolomite), and bentonite in Table 1. The bentonite is used as binder in pelletizing, and the limestone and dolomite powder is added to adjust the basicity of high MgO flux pellets. In this study, the addition amount of bentonite is 0.5%, and the addition
Bentonite, an inorganic binder, has been the main binder used in the iron ore pelletizing process since the beginning of pellet production in the 1950s. Bentonite promotes the formation of ceramic bridges between particles, which can minimize the number of pellets that collapse during firing. Despite its low cost, the inorganic …
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Comparison of the strength of dry pellets with a simultaneous decrease in bentonite content and increase in flux content: 1) 0.4% bentonite, 0.7% limestone; 2) 0.65% bentonite, 0.5% limestone. Full size image. The flux affects the strength properties of the dry pellets at higher drying temperatures – temperatures above 500°C.
However, suitable adjustment of flux composition and process parameters can make the calcined lime usable in pelletization as advantage. This study is concentrated on optimization of MgO (olivine) flux addition and basicity and finally used calcined lime in place of limestone in developing good quality iron ore pellets with combined flux.
Pellets can be kept intact during drying by introducing additions of bentonite and a flux (limestone). The purpose of the investigation being discussed in …
Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore ... Pellets in the basicity range of 0.2 to 1.6 were produced from specular hematite concentrates using bentonite or peat moss as a binder. Specific pellet ... Properties of acid pellets with MgO/SiO2 ratios between 0 and 1.3 and pellets with MgO and CaO ...
The present work illustrates the effect of limestone and dolomite as flux material in pelletization of an Indian goethetic-hematite iron ore with 59.75% Fe, 4.52% SiO2, 3.84% Al2O3, and 4.85% LOI ...
Improved Organic Binder Pellets. Hibbing Taconite pellets were made with an organic binder plus small amounts of limestone, to improve physical strength while …
DOI: 10.1016/j.powtec.2020.10.063 Corpus ID: 226333476; Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore …
The iron ore pellets may be acid or basic pellets. Acid pellets are also called as DRI (direct reduced iron) grade pellets while basic pellets are also known as BF grade or fluxed pellets. DRI grade pellets – Basicity of these pellets is usually less than 0.1. The fired pellet strength is, to a certain degree, due to the hematite bridges of ...
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Dwarapudi et al. studied the reaction mechanism of the limestone during the pellet roasting process to explore the influence of flux on the CSS of the pellets, and …
acid flux iron ore pellets – Gulin Mining 11.23 Taconite Ore Processing – US Environmental Protection … pellets. Acid pellets…
The following conclusions can be drawn from this work: 1. Addition of pyroxenite up to 5% to get 1.5% MgO in the pellets was found to be an optimum flux dosage for blast furnace grade hematite pellets. FeO in the slag phase reduced from 30% in acid pellets to around 3% in pyroxenite fluxed pellets containing 1.5% MgO.