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Magnesium oxide

Chemical Properties Production of Magnesium Oxide Application Industrial production of light magnesium oxide Toxicity Usage limit
Magnesium oxide
Magnesium oxide
CAS No.
1309-48-4
Chemical Name:
Magnesium oxide
Synonyms
MgO;km40;Corox;Marmag;Oxymag;MAGCAL;Animag;Sermag;slo369;slo469
CBNumber:
CB8853024
Molecular Formula:
MgO
Formula Weight:
40.3
MOL File:
1309-48-4.mol

Magnesium oxide Properties

Melting point:
2852 °C(lit.)
Boiling point:
3600 °C
Density 
3.58
refractive index 
1.736
Flash point:
3600°C
storage temp. 
Storage temperature: no restrictions.
solubility 
5 M HCl: 0.1 M at 20 °C, clear, colorless
form 
nanopowder
color 
White
PH
10.3 (H2O, 20℃)(saturated solution)
Water Solubility 
6.2 mg/L (20 ºC), reacts
Sensitive 
Air Sensitive
Merck 
14,5677
Stability:
Stable. Incompatible with bromine trifluoride, bromine trichloride, phosphorus pentachloride.
CAS DataBase Reference
1309-48-4(CAS DataBase Reference)
NIST Chemistry Reference
Magnesium monoxide(1309-48-4)
EPA Substance Registry System
Magnesium oxide (MgO)(1309-48-4)

SAFETY

Risk Statements  20/22-36/37/38
Safety Statements  24/25
RIDADR  UN 1418
WGK Germany  1
RTECS  OM3850000
3
TSCA  Yes
HazardClass  8
PackingGroup  III
HS Code  25199010
Hazardous Substances Data 1309-48-4(Hazardous Substances Data)

Magnesium oxide price More Price(69)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 13138 Magnesium oxide puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E 530, light, 98.0-100.5% (calc. for dried substance) 1309-48-4 500g $142 2018-11-13 Buy
Sigma-Aldrich 13138 Magnesium oxide puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E 530, light, 98.0-100.5% (calc. for dried substance) 1309-48-4 1kg $223 2018-11-13 Buy
Alfa Aesar 010800 Magnesium oxide, Puratronic?, 99.995% (metals basis) 1309-48-4 50g $318 2018-11-16 Buy
Alfa Aesar 010800 Magnesium oxide, Puratronic?, 99.995% (metals basis) 1309-48-4 10g $83.5 2018-11-16 Buy
Strem Chemicals 12-1405 Magnesium oxide nanopowder 1309-48-4 100g $99 2018-11-13 Buy

Magnesium oxide Chemical Properties,Uses,Production

Chemical Properties

Magnesium oxide is a typical alkaline earth metal oxide, chemical formula MgO. White powder, melting point 2852 ℃, boiling point 3600 ℃, the relative density of 3.58 (25 ℃). It is soluble in acid and ammonium salt solution. Its slow action with water can produce magnesium hydroxide. It can be dissolved in carbon dioxide aqueous solution to produce magnesium bicarbonate. In the air, it can gradually absorb moisture and carbon dioxide. Heating releases irritating fumes. Magnesite (MgCO3), dolomite (MgCO3 • CaCO3) and seawater are the main raw materials for the production of magnesium oxide.

Production of Magnesium Oxide

Thermal decomposition of magnesite or dolomite generates magnesium oxide. Magnesium hydroxide precipitate is obtained first by treating seawater with hydrated lime; magnesium oxide is obtained by burning magnesium hydroxide. Alternatively, we can take the magnesium chloride lumps or brine after bromination as raw material during the comprehensive utilization of seawater; add sodium hydroxide or sodium carbonate to generate magnesium hydroxide or basic magnesium carbonate precipitation, and then burn to obtain magnesium oxide. At present, China mainly uses magnesite, dolomite, brine or halogen as raw material.
Magnesium oxide accounts for the largest amount of magnesium compounds, accounting for about 3/4 of the total magnesium industry. Magnesia made at temperatures below 900 ° C is light magnesia with low density, having large specific surface area and strong absorbability. Can be used as a catalyst, rubber filler and improve the performance of rubber accelerator. Mixing with magnesium chloride solution can make magnesia cement. It can also be used as flame retardant for building materials. It can be medically used as antacids and laxatives for the treatment of hyperacidity and stomach and duodenal ulcer disease, often combined with calcium carbonate easy to cause constipation. For animal feed additives and plant fertilizers. The light magnesium oxide obtained at 950 ~ 1050 ℃has high density with particle distribution having a certain range and being easier to hydrate.
Use it to react with the silica on the silicon steel surface at high temperature to produce magnesium silicate film-like product; it can be used as a silicon steel separator to prevent the sintering of silicon steel upon high-temperature sintering. The heavy magnesium oxide prepared at high temperature of 1500-1800 ℃ has high density, small specific surface area, be difficult to be decomposed by heat, has low chemical activity, not easily to react with acid and low hydration rate. It can be used as high temperature refractory materials and the binder during manufacturing refractory crucible and the furnace lining.

Application

  • Light magnesium oxide is used in ceramics, enamel, refractory crucible, refractory bricks, etc., also used as polishing agent, binder, paint and paper filler, neoprene accelerator, activator. In medicine, it can be used as antacids, laxatives, for the treatment of hyperacidity and duodenal ulcer disease, but also for glass, phenolic, plastics and other industries.
  • Dead-roasted magnesium oxide, namely magnesite, has granular type and brick type, being widely used as the refractory materials of steel furnace, cement kiln and glass furnace.
  • Alkaline granular refractory, mainly used for metal refining industry, with massive refractory for the furnace, or granular material for maintenance; Use spray, coating method to have it attached to the furnace wall in order to enhance the furnace fire resistance.
  • Magnesium oxide produce a positive charge inside the water with most of the suspended material being negatively charged, acting absorption role, can improve the filtration effect.

Industrial production of light magnesium oxide

In the salinization industry of sea salt, it is mainly used of bitter brine, heavy brine and high temperature salt as raw materials to produce light magnesium carbonate or light magnesium oxide. Industrialized production methods include soda ash method, lime and carbon ammonia.
(1) Soda ash process include: 1. Ingredients 2. Reaction 3. Washing 4. Pyrolysis 5. Filter 6.Roasting 7. Crushed packaging. Soda ash production of light magnesium carbonate or light magnesium oxide has mature technology, higher product quality. However, consumption of soda ash, fresh water consumption is also large.
(2) Lime method uses lime milk instead of soda ash. Its reaction with magnesium chloride in brine to generate magnesium hydroxide, followed by carbonation using carbon dioxide gas, generating magnesium bicarbonate. When using the lime method, the sulfate in the brine should be minimized, otherwise large deposits of calcium sulphate are formed and mixed in the product. The advantage of this method is the use of lime instead of soda ash, reducing costs. The disadvantage is that the process and equipment is more complicated than soda ash method, and by-produces large number of CaCl2 solution to be managed.
(3) Raw materials of carbon ammonia method are the high concentrations of bitter brine, brine or salt immersion thick solution. Carbon ammonia used is ammonia bicarbonate, carbonized ammonia or sending ammonia and carbon dioxide gas directly into the brine, with carbon ammonia instead of soda ash being reacted with the magnesium chloride or magnesium sulfate in the brine to generate the corresponding magnesium carbonate. The reaction is as follows:
1. Brine containing MgCl2 and MgSO4 reacts with NH4HCO3 solution: MgCl2 + 2NH4HCO3 = Mg (HCO3) 2 + 2NH4Cl MgSO4 + 2NH4HCO3 = Mg (HCO3) 2+ (NH4) 2SO4
2. Directly send ammonia and carbon dioxide to the brine.
3. The generated MgCO3 • 3H2O and Mg (HCO3) 2 are subject to pyrolysis to generate alkaline magnesium carbonate: Mg (HCO3) 2 + 2H2O = MgCO3 • 3H2O + CO2 ↑ 5 {MgCO3.3H2O} = 4MgCO3.Mg H2O + CO2 ↑ + 10H2O
4. Alkaline magnesium carbonate is roasted to generate light magnesium oxide: 4MgCO3.Mg (OH) 2.4H2O = 5MgO + 4CO2 ↑ + 5H2O
Control of carbon ammonia process: 1. Raw material concentration and reaction temperature 2. Pyrolysis temperature; 3. Dehydration, washing and drying; 4. Roasting; 5. Mother liquor treatment.
Compared with the soda ash method, the production of light magnesium carbonate and light magnesium oxide by the carbon ammonia process is simple, the product has a high specific volume, and the supply channel of the ammonium bicarbonate is more and the cost is lower. However, the mother liquor evaporation and concentration process is of high energy consumption.

Toxicity

Magnesium oxide is mildly irritating to the conjunctiva and nasal mucosa. Vapors can cause ulcer disease. Dust can cause breathing problems, chest pain, coughing, diffusive interstitial fibrosis and emphysema. The maximum allowable concentration in the United States is 10 mg / m3.

Usage limit

FAO / WHO (1984): milk powder 10 g / kg; cream powder 1 g / kg (both limited for vending machines).
FDA, § 184.143l, 2000: use GMP as limit.
Japan limits its usage for adsorption.

Description

Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral, often found as a powder, which occurs naturally as periclase and is a source of magnesium . It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2? ions held together by ionic bonding. Magnesium oxide is only very slightly soluble in water but in aqueous media combines quickly with water to form magnesium hydroxide. The majority of magnesium oxide produced today is obtained from the calcination of naturally occurring minerals, magnesite, MgCO3, being the most common. Other important sources of magnesium oxide are seawater, underground deposits of brine and deep salt beds from which magnesium hydroxide [Mg(OH)2] is processed. In medicine, magnesium oxide can be used as an antacid to relieve heartburn, sour stomach, or acid indigestion, as a laxative for short-term, rapid emptying of the bowel (before surgery, for example) and as a mineral supplement used to prevent and treat low amounts of magnesium in the blood. Besides, magnesium oxide also has many nonmedicinal uses. Caustic calcined magnesia is used in a wide range of industrial applications e.g. plastics, rubber, adhesives and acid neutralization. Magnesium oxide with lower chemical activity can be used for fertilizers and animal feed. Dead-burned magnesia and finally fused magnesia can be used for a variety of refractory and electrical applications e.g. furnace lining, crucibles and fireproofing boarding.

Chemical Properties

white or light grey powder

Chemical Properties

Magnesium oxide forms a finely divided white particulate dispersed in air.

Uses

Absorbant for colorants prior to determination; preparation of Eschka's reagent.

Uses

Magnesium Oxide is a source of magnesium which functions as a nutrient and dietary supplement. it exists as a bulky white powder termed light magnesium oxide or as a dense white powder known as heavy magnesium oxide. it is practically insoluble in water and is insoluble in alcohol.

Uses

manufacture of refractory crucibles, fire bricks, magnesia cements and boiler scale compounds, "powdered" oils, casein glue. Reflector in optical instruments; white color standard. Insulator at low temp.

Definition

Two forms are produced, one a light, fluffy material prepared by a relatively low-temperature dehydration of the hydroxide, the other a dense material made by high-temperature furnacing of the oxide after it has been formed from the carbonate or hydroxide.

General Description

Finely divided white particulate dispersed in air. (Note: Exposure may occur when magnesium is burned, thermally cut, or welded upon.).

Reactivity Profile

Phosphorus pentachloride and magnesium oxide react with brilliant incandescence [Mellor 8:1016. 1946-1947]. The oxide is incompatible with interhalogens such as bromine pentafluoride, etc.

Hazard

Toxic by inhalation of fume. Upper respiratory tract irritant, and metal fume fever. Questionable carcinogen.

Safety Profile

Inhalation of the fumes can produce a febrile reaction and leucocytosis in humans. Questionable carcinogen with experimental tumorigenic data. Violent reaction or ignition in contact with interhalogens (e.g., bromine pentafluoride, chlorine trifluoride), Incandescent reaction with phosphorus pentachloride. See also MAGNESIUM COMPOUNDS.

Potential Exposure

Used in oil refining, pulp and paper mills; tire manufacturing; in the manufacture of refractory crucibles; fire bricks; magnesia cements and boiler scale compounds. Exposure may occur when magnesium is burned, thermally cut, or welded upon.

Shipping

UN1418 Magnesium, powder or Magnesium alloys, powder Hazard Class: 4.3; Labels: 4.3-Dangerous when wet material, 4.2-Spontaneously combustible materia

Incompatibilities

Violent reaction with halogens/interhalogens, chlorine trifluoride, bromine pentalfluoride; strong acids. Phosphorus pentachloride and magnesium oxide react with brilliant incandescence (Mellor 8:1016. 19461947). May ignite and explode when heated with sublimed sulfur, magnesium powder, or aluminum powder

References

1. https://en.wikipedia.org/wiki/Magnesium_oxide
2. https://www.chemistryworld.com/podcasts/magnesium-oxide/7645.article
3. https://pubchem.ncbi.nlm.nih.gov/compound/magnesium_oxide#section=Top
4. http://www.azom.com/article.aspx?ArticleID=54
5. https://medlineplus.gov/druginfo/meds/a601074.html
6. https://www.merriam-webster.com/dictionary/magnesium%20oxide
7. http://www.webmd.com/drugs/2/drug-3954/magnesium-oxide-oral/details

Magnesium oxide Preparation Products And Raw materials

Raw materials

Preparation Products


Magnesium oxide Suppliers

Global( 353)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hebei Guanlang Biotechnology Co., Ltd.
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Shenzhen Sendi Biotechnology Co.Ltd.
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View Lastest Price from Magnesium oxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-14 Magnesium oxide
1309-48-4
US $1.00 / kg 1kg 98% CARA23 career henan chemical co
2018-09-13 Magnesium oxide
1309-48-4
US $1.00 / G 100G 99.9% 50000tons Hebei Ruishun Trade Co.,Ltd
2018-08-06 Magnesium oxide
1309-48-4
US $10.00 / KG 1KG 99% 5MT per month Hebei Guanlang Biotechnology Co., Ltd.

Magnesium oxide Spectrum


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