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Pharmaceuticals
Published in James G. Speight, Handbook of Petrochemical Processes, 2019
Gaviscon is an antacid medication that reduced stomach acid and the typical uncomfortable side effects that accompany acid reflux. The active ingredients of Gaviscon are (i) aluminum hydroxide (Al(OH)3) and (ii) magnesium carbonate (MgCO3).
Smoke Production
Published in John A. Conkling, Christopher J. Mocella, Chemistry of Pyrotechnics, 2019
John A. Conkling, Christopher J. Mocella
Magnesium carbonate (MgCO3) is also used as a coolant, absorbing heat to decompose into magnesium oxide (MgO) and CO2. Varying the amount of coolant can be used to help obtain the desired rate of burning and the correct reaction temperature; if a mixture burns too rapidly, more coolant should be added.
Making Magnesium With Laser
Published in Takashi Yabe, Tatsuya Yamaji, The Magnesium Civilization, 2010
In fact, there is not much magnesium oxide on the land, because magnesium oxide absorbs carbon dioxide quickly and becomes magnesium carbonate. This means that magnesium oxide is an excellent adsorbent of carbon dioxide. When magnesium carbonate is heated to around 200°C, carbon dioxide is separated and magnesium oxide is obtained. It might be a possible way of thinking that the collection of carbon dioxide and supply of magnesium oxide for smelting are achieved at the same time.
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.
Development, testing and microstructural study of aluminum foam in automobile application
Published in International Journal of Ambient Energy, 2020
M. Sangeetha, S. Prakash, K.S. Sridharraja, J. Muralimano
It is an inorganic white salt. In this work, anhydrous magnesium carbonate (Figure 4) is used, because it has a lower melting point than aluminum and it escapes out as gaseous oxides forming simple magnesium oxide and carbon dioxide. This carbon dioxide gets released from the inner portion of the structures and the foaming has been done on the material AA6061. Magnesium carbonate decomposed into magnesium oxide and carbon dioxide.