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2018年10月15日 Electrokinetic removal of chromium from chromite ore-processing residue using graphite particle-supported nanoscale zero-valent iron as the three-dimensional electrode
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2016年1月10日 Targeted experimental analyses of the two regimes revealed that selective sulfidation of chrome spinel occur only under the reaction conditions at Area-2. It is
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2021年5月10日 The distribution of chrome ores in China is also unbalanced, 49% of the chrome ore deposits are distributed in the Xizang, Neimenggu, Xinjiang, and Gansu
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2016年9月1日 The inclusion of small amounts of silicon, phosphorus and sulphur in iron ores or concentrates can have a profound effect on the steel making process and thus on
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2017年2月9日 The chromium removal from the waste was carried out by two methods: (1) oxidative alkali roasting with NaOH and/or Na2CO3, followed by water leaching and (2)
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2019年12月1日 In the present study, we examined the removal of gangue components from iron ores of several types and different countries of origin by hydrothermal treatment
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2007年6月1日 A novel approach for the removal of chrome-bearing spinel impurities (chromite) from weathered ilmenite concentrates has been proposed.
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2011年5月7日 Chromium Removal from Iron-Rich Waste Generated During Processing Lateritic Nickel Ores Chapter © 2017 Potential of Steelmaking Slag as New Phosphorous
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2023年11月10日 Scientific Reports - Removal of chromium from tannery industry wastewater using iron-based electrocoagulation process: experimental; kinetics; isotherm
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2016年6月1日 Iron ore having high-sulfur content causes problems in the concentrate production, pelletizing, and steel-making processes and environmental issues such as sulfur dioxide emission during the concentrate pelletizing process, and effect on steel quality. The current study was focused on the removal of sulfur from iron ore concentrate using
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2016年1月10日 It is suggested that the lack of selective chrome spinel sulfidation under Area-1 conditions is the change in activity of iron (a Fe) due to weathering action on chrome spinel grain. Introduction Ilmenite is used for titania (TiO 2 ) pigment production through either the sulphate or chloride route processes (Ranganathan et al., 2012).
خبير الاتصالchromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is
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2021年1月4日 Chromite ore FeOCr 2 O 3 is a major ore for Chromium. India accounts for about 10% of world share of shipping grade Chromium ore reserves, having 45% Cr 2 O 3 content. South Africa and Zimbabwe and India are the Top five countries of Chrome ore processing industries in the Word (Indian Minerals Year Book 2016). Interestingly in
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2023年12月5日 India has proposed in its new budget for fiscal year 2017 (FY17) to remove export duties on iron ore with Fe content below 58%, Kallanish learns from the Indian government. These duties are currently at 10% for iron ore fines and 30% for iron ore lumps. Also proposed is the removal of the 30% duty on chrome ore and concentrate exports.
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2019年7月26日 Tin-bearing iron ore is a complex iron ore reso urce, which generally has an iron content of 30– 55% and a tin content of 0.2–1.2% [22]. Iron in tin-bearing iron ore mainly exists in the form of
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2021年6月18日 Acid leaching is to dephosphorize ore with hydrochloric acid, nitric acid or sulfuric acid. For ore with low grade and complex composition, it doesn’t require fine grinding to dissociate monomers. The purpose of phosphorus reduction can be achieved as long as the ore is exposed and in contact with the leaching solution. #2 Cons.
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2019年11月11日 Removal of Gangue Component during Hydrothermal Treatment with NaOH. Table 1 shows the chemical composition, pore properties, and iron forms of the iron ore used in this study. Table 2 summarizes the yield, gangue removal extent, pore properties, and Fe forms in the iron ores treated with a hydrothermal method using 5 M
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2017年4月12日 The selective flocculation tests showed that the Fe grade can be enhanced from 58.24% to 64.60% Fe at a recovery of 66.33% using polyacrylamide as the flocculant. A Fe grade of 63.20% at a ...
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2023年1月1日 Idiomorphic chromite is the only ore mineral appearing in economic quantities. The average content of the ore is 26% Cr 2 O 3 and the Cr/Fe ratio is 1.55. The Kemi chromium mine is an open-pit mine with a waste rock to ore ratio of 5.5:1. At Kemi, the ore from the mine contains 11% iron and 25.5% Cr 2 O 3.
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2011年5月1日 The selective HCl leaching method was used to remove phosphorus from high phosphorus iron ores. The hydroxyapatite in high phosphorus iron ores was converted into soluble phosphate during the process of HCl leaching. The effects of reaction time, particle size, hydrochloric acid concentration, reaction temperature, liquid-solid ratio and
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2006年12月1日 Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be
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2011年4月1日 Review of the research works. The critical issues related to the chromite process plants investigated by various researchers have been categorized as: 5.1. Reducing the tailing losses (9–20% Cr 2 O 3 ). 5.2. Beneficiation of low and sub-grade chromite ore (10–30% Cr 2 O 3 ). 5.3.
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2019年7月1日 During sintering, fine iron ore particles are mixed with a small amount of coal (5% by weight), and the mixture is then ignited (Peters, 1982).The process is driven by the decrease in surface energy (surface area) that causes the edge of the particles to fuse together (Fig. 1).The particles produced in this manner have a lower density than
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2021年6月4日 the adsorbent showing the best removal percentage of Chromium (VI) under the given conditions. The effect of adsorbent dosage level on percent removal of chromium was studied using Chromium (VI) concentration of 300 mg/L having adjusted the pH to 2. The selected adsorbent concentration was varied from 4g/L to 20g/L.
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2016年2月1日 Low-grade iron ore received from the West Singhbhum area of Jharkhand state in India was used to develop a beneficiation flow sheet to remove alumina (Al2O3 ) and silica (SiO2 ) from the ore to ...
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2023年10月26日 The optimum procedure results in a high-grade iron concentrate with an iron assay of 65.65%, an Fe recovery rate of 80.07%, and an arsenic content of 0.085%, while achieving a 93.29% As removal rate from the
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2022年1月1日 Major impurity elements in iron ore are silicon, aluminum, phosphorus, and sulfur. Often, a chemical separation is the only method able to remove phosphorus from iron ores. Phosphorus can occur as phosphorus-containing minerals (e.g., apatite) and being finely dispersed in hematite in oolitic ironstones or in goethite in goethite–hematite ...
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2021年5月10日 According to the USGS statistics of 2019, the shipping-grade (Cr 2 O 3 >45%) chromium resources around the world exceed 12 billion tons, enough to meet the demand for centuries (https://prd-wret.s3-us-we, 2019).However, about 90% of the chromium resources are excessively concentrated distribution in South Africa,
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2017年2月9日 Hydrometallurgical processing of nickel-cobalt lateritic ores at Sered in Slovakia generated approximately 9 millions tones of leaching residues that contain mainly iron around 45–50% beside a number of minor metals such as chromium, nickel, cobalt and aluminum [].Due to their fine particle-size and the heavy metals content, the leaching
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