Is magnesium oxide powder toxic and what are the effects

1, the use of magnesium oxide

1.1 Used in libraries to prevent books from being corroded by acid.

1.2, used for wire insulation.

1.3, used to treat heartburn, stomach acid and acid indigestion.

1.4, used as a short-acting laxative.

1.5, used as a magnesium supplement.

1.6, because of its refractory can be used as furnace lining.

1.7, used as a reference for white in colorimetry, the emissivity is about 0.9.

1.8, pressed magnesium oxide can be used as optical coating. When the coating thickness is between 300 nm and 7 mm, the coating is transparent.

1.9, used for stone climbing, can absorb sweat, note: inhalation of magnesium oxide smoke can lead to metal moyamoya disease.

2, the physical properties of magnesium oxide

White amorphous powder. The relative density is 3.26 ~ 3.43. Odorless, tasteless and non-toxic. Soluble in acid and ammonium salt solution, insoluble in water and ethanol. In the visible and near UV range? Strong refraction. Exposed to the air, it is easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate, which combines with water to form magnesium hydroxide, showing a slightly alkaline reaction. 10.3. But highly soluble in dilute acids, very slightly soluble in pure water, due to the presence of carbon dioxide to increase its solubility, it is a mild catalyst. Relative density (d254)3.58. Melting point 2852℃. Boiling point :3600℃.

3, the chemical properties of magnesium oxide

Has a relatively strong reducing property, can react with hot water to release hydrogen, combustion can produce blinding white light, magnesium and fluoride, hydrofluoric acid and chromic acid do not act, also is not attacked by caustic alkali, but easily dissolved in organic and inorganic acids, magnesium can be directly combined with nitrogen, sulfur and halogen, etc. Organic chemicals including hydrocarbons, aldehydes, alcohols, phenols, amines, lipids, and most oils have little or no effect on magnesium.

3.1. Reaction with non-metallic elements :2Mg+O2==2MgO 3Mg+N2=Mg3N2.

3.2. Reaction with water :Mg+2H2O=Mg(OH)2+H2(heating).

3.3. Reaction with acid :Mg+2HCl=MgCl2+H2.

3.4, reaction with oxide :2Mg+CO2=2MgO+C(ignition).

The function and efficacy of magnesium oxide

Used as antacid and anti-ulcer drug, antacid, laxative. The acid resistance is stronger than sodium bicarbonate, slow and durable, and does not produce carbon dioxide. It reacts with gastric acid to produce magnesium chloride, releases magnesium ion, stimulates intestinal peristalsis and has laxative effect. It is suitable for patients with hyperacidosis, gastric and duodenal ulcer accompanied by constipation. For those without constipation, the laxative effect can be corrected by taking calcium carbonate. For hypokalemia and arrhythmia caused by digitalis poisoning. It can also be used for the auxiliary treatment of myocarditis sequelae, chronic heart dysfunction, coronary heart disease, etc