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Occurrence and Resources of Magnesium
Published in Hussein K. Abdel-Aal, Magnesium, 2019
Magnesite, in the form MgCO3, represents an important ore used for magnesium production. It is the source of a range of industrial minerals. If pure magnesite is found, it contains 47.8% magnesium oxide and 52.2% carbon dioxide. However, natural magnesite almost always contains other compounds. This may include calcium carbonate as the mineral calcite, and iron carbonate as the mineral siderite.
Methods of exploration and investigation of the Magnesian raw material in Ukraine
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
More than 90 % of a world mining of magnesite burns for reception fire-resistant magnesia in powder form and molded articles. These materials will be used self-maintained or in an intermixture with other refractoriness for interior lining of the basic fore hearth operators of furnaces and converters. Besides the magnesite will be used by production apart of resistant cement; for impregnation of wood building constructions, which eliminates their combustion and corruption; in a pharmaceutical industry.
Effects of fine–coarse particles interaction on flotation separation and interaction energy calculation
Published in Particulate Science and Technology, 2018
Jin Yao, Jiwei Xue, Dong Li, Yafeng Fu, Enpu Gong, Wanzhong Yin
Magnesite is the most important raw material utilized in the refractories industry. China has the most magnesite reserve in the world at 13 billion tons. In the recent years, as the high-grade magnesite was being used up, many researches have been done to process the low-grade ores. Froth flotation was used for magnesite mineral processing as early as in 1930s by Doerner and Dwigh (Chen and Tao 2004). Single mineral flotation tests are widely used as a reference in flotation separation research to investigate the floatability of minerals for evaluating actual flotation processes. However, in most cases, the recovery of some minerals exhibit large differences in the single mineral flotation tests and artificially mixed minerals flotation methods under the same flotation conditions, which reveals that the interactions of minerals affect the flotation behavior of the minerals. This interaction effect may be due to a combination of factors, including pH variation, dissolved ions, aggregation/dispersion, competitive adsorption, or particle sizes. Among these reasons, the influence of fine particles plays an important role in many flotation processes (Lange, Skinner, and Smart 1997; Anastassakis 1999; Gui et al. 2013; 2014).
Research progress, problems and prospects of mine water treatment technology and resource utilization in China
Published in Critical Reviews in Environmental Science and Technology, 2020
Siyu Zhang, Hao Wang, Xuwen He, Shaoqing Guo, Yu Xia, Yuexi Zhou, Kai Liu, Shipeng Yang
In the process of acidic mine water treatment in the past, lime neutralization treatment process was mainly used. This method has many flaws like easy to produce sediments such as CaSO4, causing secondary pollution, poor buffering capacity, the dosage is not easy to control, the neutralization is easy to excessive, and the processing cost is high. Light burned magnesium powder is derived from magnesite tailing. The main chemical component of magnesite is magnesium carbonate (He, Shao, & Jiang, 2007). Industrially, it mainly uses magnesium carbonate to prepare various refractory materials and magnesium salts. Northeast China, northwest China, north China and south China have all produced this material. Because magnesite tailings are waste products, the cost of producing light burnt magnesium powder is very low. The main component of light burnt magnesium powder is activated magnesium oxide. In the process of neutralizing acidic substances with magnesium oxide, the pH of the solution will not exceed 9 even in the case of too much usage. The experimental condition is easy to control. If the neutralized object is sulfuric acid, usually no precipitate is formed and no scaling problem will occur. The neutralized product is magnesium sulfate, which can be used as a magnesium sulfate-containing fertilizer. Slowly neutralize acid-containing wastewater with light burnt magnesium powder, and some metal ions in the wastewater will form precipitates. This resulting precipitate is large and dense than the treatment with lime and caustic soda, and it is easy to precipitate, clarify and filter. Hence, light burnt magnesium powder is used as a neutralizing agent to treat acidic wastewater, which is used waste residue treat waste water, and the economic benefits are more remarkable.
Green synthesis of hydrotalcite from untreated magnesium oxide and aluminum hydroxide
Published in Green Chemistry Letters and Reviews, 2018
F. J. W. J. Labuschagné, A. Wiid, H. P. Venter, B. R. Gevers, A. Leuteritz
Of course, given the right conditions, other species can also form. For example, according to Hartmann-Petersen et al. (18), magnesite (MgCO3) is a highly stable carbonate form of magnesium that is produced by bubbling CO2 through a magnesium hydroxide slurry; the precipitation occurs relatively rapidly.