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Light Magnesium Oxide
This product is sintered from high-quality ore, desulfurization, magnesium sulfate and other main raw materials.
It has a brittle texture, porous structure and high reactivity. After sintering, solid phase reaction easily occurs or reacts with water to form Mg(OH)2 and hardens, and has bonding ability.
Application Scenarios of Light Magnesium Oxide
Light-burned magnesium powder is mainly used as a raw material for making fire-proof glass magnesium boards and composite insulation boards. In the water treatment industry, light-burned magnesium powder is used to remove silicon and heavy industrial waste liquids from water. It can also be used as a neutralizer for industrial waste gas treatment. Magnesium powder can react with flue gas to generate magnesium sulfate, thereby removing SO2 from industrial waste gas, which is better than the sulfur removal effect of calcium compounds.
China's Leading Magnesium Oxide Manufacturer and Supplier
Let CHIMAG help you with your magnesium oxide powder needs. We use only the best materials and employ innovative production techniques.
A Quick Self-Nomination, why CHIMAG?
CHIMAG is a veteran company in the industrial magnesia powder industry, with efficient business operations, cutting-edge technology and a professional team. We can provide you with customized magnesium oxide solutions based on your specific needs to protect your project.
Excellent craft: We are proud of our R&D and production teams who ensure every batch meets the high quality standards we set.
Excellent value for money: Advanced production technology and professional equipment greatly reduce our production costs, providing us with the most competitive prices.
Trustworthy Customer Service: Our customer service stands apart. When you call us, you’ll always get help from professionals who can provide expertise and meet your unique requirements.
Frequently Asked Questions
We’ve put together a list of frequently asked questions about electrical grade magnesium oxide. If you have further questions, please feel free to contact our customer support. Our team of experts is ready to help.
How do I get a Quote for Magnesium Oxide?
Please contact our customer service team for a quote. They are available 24/7. Just have your specifications ready, such as category, temperature resistance, etc.
Can I Get a Sample Before Place The Order?
Yes, we will provide you with a sample that you can physically evaluate. This will take 3 to 7 business days to complete. Custom orders may take longer.
What Is The Turnaround Time On My Order?
Yes, we will provide you with a sample that you can physically evaluate. This will take 3 to 7 business days to complete. Custom orders may take longer.
What is Your MOQ For The Order?
Our minimum quantity is usually 1 ton. Of course, if you feel it is not appropriate, you can communicate with us.
Have More Questions?
We are happy to answer any questions you may have about our products and company.
Comprehensive Guide to Light Magnesium Oxide Buyers
Magnesium oxide (MgO) is commonly known as magnesium oxide, light burnt powder, and magnesium oxide powder.
Density 2.94 white powder. The melting point is 2852℃, and the boiling point is 3600℃—soluble in acid and ammonium salt, insoluble in water and ethanol.
When the calcination temperature is 400°C, the specific surface area is 180m2/g.
The specific surface area is only 3m2/g at 1300℃. It’s easily deliquescent in the air. It is an air-hardening cementing material.
1. Mineral sources of magnesium oxide:
- Magnesite ore is one of the primary sources of magnesium oxide, with a (MgO) content of about 47%. MgCO3 is lightly calcined (400-600°C) and then ground into a solid powder (Mgo). Mineral resources are widely distributed in Xinjiang, Sichuan, Shandong, Tibet, and other autonomous regions and provinces, with reserves of 2.8 billion tons, accounting for 30% of the world’s mineral resources.
- Dolomite ore [CaMg(CO3)2] is also the primary source of magnesium oxide, and its reserves are more significant and more widely distributed, with MgO content accounting for about 22%. CaO content accounts for about 30%, and the rest is 48%. The theoretical structure of MgCO3 and CaO is one-to-one. The demarcation line for dolomite is based on the content of MgCO3 above 25%. Otherwise, it cannot be used as an ore for the production of magnesium oxide, nor can it be called dolomite.
- Serpentine [Mg6(Si4O10)(OH)2] is also a raw material for the production of magnesium oxide, mainly hydrosilicate (3MgO·2SiO2·2H2O).
- The slag from smelting lightweight magnesium alloys is also the raw material for producing magnesium oxide.
2. Magnesium oxide additives:
After the reaction between pure aqueous solution and magnesium oxide, Mg(OH)2 is in a loose state and has no strength, so it has no practical value. In 1867, Swedish scholar Sorrell invented magnesia cement. The compressive strength and flexural strength of magnesium chloride aqueous solution as the curing agent in a dry environment are almost the same as those of ordinary silicon cement. The compressive strength is 110mpa/28d, and the flexural strength is 20Mpa/28d.
Magnesium chloride hexahydrate (MgCl2·6H2O) curing agent makes oxychloride cement have the same compressive and flexural strength as ordinary silicon cement, but it can only be used in a dry environment. Magnesium chloride hexahydrate, also known as hydrochlorite, is soluble in cold water at 0°C. The water-soluble ratio is 281g/100g, the relative density is 1.56, and the melting point is 712°C.
It starts hydrolysis when heated to 118°C and decomposes into MgO and HCl at high temperatures.MgCl2•6H2O→Mg(OH)CL+HCL+5H2OMg(OH)CL→MgO+HCl. The tetrahydrate, dihydrate, monohydrate, and anhydrous magnesium oxide are omitted. Its content accounts for 15 to 20% of MgO.
Magnesium sulfate heptahydrate (MgSO4·7H2O) is a curing agent and waterproofing agent with a molecular weight of 246.48 as colorless crystals or powder. No bromine, no bitter taste. It dissolves in water at 250°C, becomes anhydrous magnesium sulfate (MgSO4), and is reduced to MgO above 400°C. It is the reaction product of MgO and H2SO4. The dosage accounts for 15 to 20% of MgO. The cost is higher than MgCl2·6H2O.
Ferrous sulfate heptahydrate (FeSO4·7H2O) is a waterproofing agent, light blue single crystal italic, also known as green vitriol.1.898 (at 18℃) quickly melts in water and has natural water-producing green vitriol. The dosage accounts for 3% of the total amount.
Styrene-butadiene latex (SBR solid content ≥45%) is waterproof latex, and the dosage accounts for 6 to 12% of the total amount.
Chloroprene latex, also known as chloroprene latex, is the most stable waterproof latex in magnesium oxide materials. The dosage of chloroprene latex accounts for 6 to 12% and 1% of (OHCH2CH2) 3N is added at the same time.
Silica sol, styrene-acrylic latex, nitrile latex, etc., can be used as waterproof latex. The dosage accounts for 6 to 12% of the total amount.
SiO2 additives account for 10 to 15% of the total amount.
Urine-formaldehyde resin and melamine are also waterproofing agents, accounting for 2 to 3% of the total amount.
Phosphoric acid (H3PO4), also known as orthophosphoric acid, is a better curing waterproofing agent. The dosage accounts for 4% of the total amount.
Modified sodium silicate is a better curing waterproofing agent. The dosage accounts for 1 to 3% of the total amount.
3. Four stages of magnesia cement hydration heat release cycle:
In the early stage of hydration induction, heat is released sharply within 10 minutes of mixing and feeding to form the first exothermic peak.
The hydration induction period is the slow period of hydration reaction within 60 minutes of feeding.
The hydration acceleration period is the second exothermic peak of hydration heat within 240 minutes of feeding.
The hydration deceleration and stable period is from the top of the second exothermic peak to a gradual slowdown until stable, and the hydration reaction terminates at 14 hours. Through the four stages, it can be seen that the initial setting is 1.5 hours, the final scene is 4 to 5 hours, and the exothermic curing is completed after 14 hours. After 14 days, it can be shipped out of the warehouse and installed (wall panels or various prefabricated parts) in 20 days after passing the test. The cast-in-place magnesia concrete can be removed from the formwork after 6 hours.
4. Calcination temperature and time are the keys to determining the activity and dispersion of MgO:
Regardless of whether it is magnesite, dolomite ore, etc., the decomposition reaction during calcination is endothermic. Due to the decomposition of CO2 and H2O, MgO forms a porous crystal structure and is not dense.
The product has good activity and large dispersion (180m2/g). This refers to the temperature between 400°C and 600°C. The development at this time is ground at room temperature.
It hydrates in just a few minutes. Therefore, a good calcination process should control the temperature between 400°C and 600°C to save energy and produce good quality products. When the temperature is higher than 900°C, the crystal densification and dispersion are small. At 1300°C, it is only 3m2/g. 95% of magnesium oxide is hydrated at room temperature.
Requires 75d. From the Glasson lattice constant, it can be seen that at 400°C, MgO reaches 0.425nm, and Mg(OH) reaches 0.424nm. At this time, the product activity is the best. In other words, the light-burning temperature of 400°C to 600°C is the optimal temperature, which is the source of the saying of light-burning powder. The longer the calcination time, the denser the crystal structure becomes, and it becomes more difficult to hydrate.
5. Several elements of the best mix ratio:
- Specific gravity (relative density) of the blending agent aqueous solution
The specific gravity of the aqueous solution when preparing lightweight magnesia concrete is 1.35 to 1.50.
The specific gravity of the aqueous solution when preparing lightweight wallboard concrete is 1.50 to 1.60.
The specific gravity of the aqueous solution when preparing lightweight floor, insulation board, and ceiling concrete is 1.80.
When preparing fireproof and waterproof magnesia decorative coatings, the specific gravity of the aqueous solution is 1.9 to 2.0.
- Weight ratio of light filler to magnesium oxide (%)
Cast-in-situ lightweight concrete – 35.
Wall panels – 25.
Components – 50.
Paint – 10.
- The amount of aqueous solution should be 1.60 to 2.0 times the weight of magnesium oxide.
- The matching ratio of magnesium oxide, magnesium chloride, and water is 5~5.6: 1~1.2: 8~11.
The mixing ratio of light filler and magnesium chloride is 1～1.3: 3～3.9.
