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What are the prices of light burning powder for chemical plants?

Release date:2017-11-10 Author: Click:

What are the prices of light burning powder for chemical plants?

Light burned magnesia powder: scientific name Magnesium Oxide, commonly known as magnesia magnesia, light burning powder price quotation, magnesia powder. Density 2.94, pale yellow or white powder. The melting point is 2852 centigrade, and the boiling point is 3600. It is soluble in acid and ammonium salt, which is difficult to dissolve in water and ethanol. The specific surface area of the calcined temperature at 400 C is 180m2/g. At 1300 C, the specific surface area is only 3m2/g. Easy deliquescence in the air. It belongs to the pneumatic cementation material.

Light burned Magnesium Oxide is also called caustic magnesia, active magnesia. It is a light burned Magnesium Oxide obtained by calcining of Mg (OH) 2, a natural magnesite ore, magnesium Hydrite and magnesium hydroxide extracted from sea water or brine, which is calcined at 700~1000 C.

2 ore source

(1) magnesite ore is one of the main sources of Magnesium Oxide, the content of (MgO) is about 47%, and MgCO3 is calcined by calcined (400~600) calcined (Mgo). The mineral resources are widely distributed in provinces and autonomous regions such as Liaoning, Xinjiang, Sichuan, Shandong and Tibet, with a total reserves of 28 billion tons, accounting for 30% of the world's mineral resources.

(two) dolomite [CaMg (CO3) 2] is also the main source of Magnesium Oxide, and its reserves are more widely distributed and MgO content is about 22%.  The content of CaO is about 30%, the rest is 48%, and the two of MgCO3 and CaO's theoretical structure are one to one. The demarcation line of dolomite is based on the content of MgCO3 above 25%, otherwise it can not be used as the ore for producing Magnesium Oxide, nor can it be called dolomite.

(three) serpentine [Mg6 (Si4O10) (OH) 2] is also the raw material for the production of Magnesium Oxide, mainly magnesium silicate (3MgO. 2SiO2 2H2O).

(four) melting slag of light magnesium alloy is also the raw material for producing Magnesium Oxide.

3 admixture

After pure water solution reacts with Magnesium Oxide, Mg (OH) 2 is loose state without strength and practical value. In 1867, Swedish scholar Sorel invented magnesia cement. Using magnesium chloride [1] aqueous solution as curing agent, the compressive strength and strength of PSI cement are almost the same in dry environment. The compressive strength is 110Mpa/28d, and the flexural strength is 20Mpa/28d.

(1) six water magnesium chloride (MgCl2. 6H2O) solidifying agent makes magnesia cement with the same compressive strength as universal silicon cement, flexural strength, but it can only be used in a dry environment. Six water magnesium chloride, also known as chlorhydric stone, is soluble in cold water at 0 degrees centigrade, and its relative water solubility is 281g/100g, relative density is 1.56, melting point is 712 degrees. The hydrolysis begins at 118 C and decomposes into MgO and HCl at high temperature.

MgCl2. 6H2O - Mg (OH) Cl+HCl+5H2O

Mg (OH) Cl to MgO+HCl

For four water, two water, one water and [2] magnesium chloride, we can refer to "brief introduction of magnesium chloride in Anmei Industrial Development Co., Ltd.". Its content accounts for 15 ~ 20% of MgO

(two) seven water Magnesium Sulfate (MgSO4. 7H2O) is a curing agent and a waterproofing agent with a molecular weight of 246.48 colorless crystals or powders. No Bromination and bitterness. It was dissolved in water at 250 C and became anhydrous Magnesium Sulfate (MgSO4) and reduced to MgO at 400 OC. It is a reaction product of MgO and H2SO4. The amount of admixture is 15 ~ 20% of MgO. The cost is higher than MgCl2. 6H2O.

(three). Seven water sulfated ferrous sulfate (FeSO4. 7H2O) is a waterproof agent, a light blue single crystal italic, also known as the relative density of alunite 1.898 (18 C) to melt in water, with natural water green alunite. The amount of the total amount was 3%.

(four) styrene butadiene latex (SBR containing more than 45% solid content) is waterproofing latex, which accounts for 6 to 12% of the total volume.

(five) neoprene latex, also known as chloroprene rubber latex, is the most stable waterproofing latex content in Magnesium Oxide material, which accounts for 6 to 12%, while 1% (OHCH2CH2) 3N is added.

(six) silica sol, styrene acrylic latex, butyl rubber latex and so on can be used as waterproof latex content of 6 to 12% of the total volume.

(seven).SiO2 additive accounted for 10 to 15% of the total volume.

(eight) urea formaldehyde resin and melamine are also 2 to 3% of the total volume of waterproofing agents.

(nine) phosphoric acid (H3PO4), also known as orthophosphate, is a good curing waterproofing agent, accounting for 4% of the total volume.

(ten) modified sodium silicate is a good curing waterproofing agent, which accounts for 1 to 3% of the total volume.

Four stages of hydration and exothermic period of 4 magnesia cement

In the early stage of hydration induction, the first exothermic peak was formed in the 10min during the process of mixing and feeding.

The induction period of hydration is the slow reaction period of 60min hydration.

The accelerated period of hydration is the second exothermic peak of 240Min in water.

The deceleration period of hydration decelerated gradually from the top of the second exothermic peak to stable, and the hydration reaction of 14h terminated. Through four stages, it can be seen that the initial coagulation 1.5h, the final condensing 4 ~ 5h, the 14h end exothermic maintenance 14 days, the qualified 20d can be out of the library installation (wall plate or all kinds of prefabricated parts), and the cast-in-place magnesia concrete 6h can be dismantled.

Calcination temperature and time are the key to determine the activity and dispersion of MgO.

Light burned magnesia

The decomposition reaction of magnesite and dolomite ore is endothermic reaction for calcining raw materials. Due to the decomposition of CO2 and H2O, the formation of MgO with multi pore crystal structure is good, and the degree of dispersion is great (180m2/g). The product is at 400 C to 600 C, and then the product is fined after a few minutes at normal temperature. Therefore, a good calcining process should control the temperature at 400 ~ 600 C, that is, the quality of energy products will be saved. When the temperature is above 900 C, the densification and dispersity of the crystals are small at 1300 3m2/g and 75D at 95% of normal temperature. From the lattice constant of gram, we can see that when MgO is 0.425nm at 400, Mg (OH) reaches 0.424nm, the product has the best activity. That is to say, the light burning temperature of 400 to 600 degrees is the best source of light burning powder. The longer the calcination time is, the more dense the crystal structure is and the more difficult it is to hydrate.

Several elements of the best mix ratio:

(1) the specific gravity (relative density) of the mixed water solution. The proportion of the aqueous solution of light magnesia concrete is 1.35 to 1.50. The proportion of water solution in light weight concrete wall is 1.50 to 1.60.  Light weight floor, heat insulation board and ceiling concrete are prepared at a specific gravity of 1.80. The proportion of water solution for fire protection and waterproof magnesia oxygen decorative coatings is 1.9 to 2.

(two) light weight filler accounts for Magnesium Oxide weight ratio (%) cast-in-place lightweight concrete - 35. Wall plate - 25. Component - 50. Paint - 10.

(three) the weight of water solution accounts for 1.60 to 2 of Magnesium Oxide's weight.

(four) the matching ratio of Magnesium Oxide, magnesium chloride and water is 5 to 5.6: 1 to 1.2: 8~11. The matching ratio of light filler and magnesium chloride is 1 ~ 1.3: 3 ~ 3.9.


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  • Contact: manager Yin

    Cell phone: 15998008088

    Phone: 0412-3778988

    E-mail:hcdsky@hcdsky.com

    Address: the archway Industrial Park of the archway of the archway of Haicheng

    (Haicheng Dingsheng Mining Co., Ltd.)

    Web site: www.lndsky.com


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