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What is the price of light burned magnesia powder and 6 magnesium chloride mixed?

Release date:2017-11-16 Author: Click:

Light burned magnesia powder (MgO) is commonly known as diamond bitter soil, light burning powder price and magnesia powder. Density of 2.94 white powder. Melting point 2852 C, boiling point 3600 C. Soluble in acid and ammonium salt. It is difficult to dissolve in water and ethanol. The specific surface area is only 3m2/g. in air when the calcined temperature is 180m2/g.1300 C, and it belongs to pneumatic cementation material. (heavy Magnesium Oxide).

One, the source of Magnesium Oxide:

(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 ore source is widely distributed in Xinjiang, Sichuan, Shandong, Tibet and other autonomous regions and provinces, with reserves of 28 million tons, accounting for 30%. of the world's source.

(two) [CaMg (CO3) 2] of dolomite ore is also the main source of Magnesium Oxide, and its reserves are more widely distributed, MgO content accounts for about 30% of.CaO content, and the rest is 48%, MgCO3 and CaO theory structure is one to one. The demarcation boundary of dolomite is based on the content of MgCO3, otherwise it can not be used as the ore for producing Magnesium Oxide. It can not 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.

Two, the admixture of Magnesium Oxide

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Mg (OH) 2 after the reaction of pure water and Magnesium Oxide is a loose state without strength and practical value..1867 Swedish scholar Sorel invented magnesia cement. The strength of the magnesium chloride solution as a curing agent in the drying environment is almost the same as the compression strength of the compressive strength of the universal silicon cement. The compressive strength 110mpa/28d, the flexural strength 20Mpa/28d.

(1) six water magnesium chloride (MgCl2? 6H2O) curing agent can make oxychloride cement have the same compressive strength as universal silicon cement, flexural strength, but it can only be used in a dry environment. Six water chloride magnesium chloride is also known as chlorinate, it is dissolved in cold water at 0 C, the relative density of water soluble ratio is 1.56, melting point is 712 C, and heated to 118 C to start hydrolysis and high temperature. Decomposed into MgO and HCl.

MgCl2? 6H2O - Mg (OH) CL+HCL+5H2O

Mg (OH) CL to MgO+HCl

For four water, two water, one water and anhydrous Magnesium Oxide, it is 15 to 20% of MgO.

(two). Seven water Magnesium Sulfate (MgSO4? 7H2O) is a curing agent and a waterproof agent, the molecular weight is 246.48 colorless crystallization or powder. No Bromination and bitterness. Dissolved in water 250 C to become anhydrous Magnesium Sulfate (MgSO4), and more than 400 degrees to MgO. it is a product of MgO and H2SO4. The cost of the 15 ~ 20%. of MgO is higher than MgCl2? 6H2O.

(three). Seven water 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), which is easily melt in water, and has natural water producing alunite. The amount of the total amount is 3%..

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

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

(six) silica sol, styrene acrylic latex and butadiene rubber latex can all be used as waterproof latex for 6 ~ 12%. of total volume.

(seven).SiO2 additive accounts for 10 ~ 15%. of the total amount of material

(eight) urea formaldehyde resin and melamine are also 2 to 3%. of the total water content.

(nine) phosphoric acid (H3PO4), also known as orthophosphate, is a good curing waterproofing agent, which accounts 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.

Three, four stages of hydration and exothermic period of magnesia cement

In the early stage of hydration induction, the first exothermic peak was formed in the 10min during the 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 stabilization period of the hydration deceleration is gradually decelerating from the second exothermic peak to the stable at the beginning of the second exothermic peak. The hydration reaction terminates at the end of the hydration reaction. Through four stages, it can be seen that the initial condensing 1.5h, the end condensing 4 to 5h, the 14h end exothermic maintenance and the qualified 20d can be put out of the library (wall plate or various preforms), and the cast-in-place magnesia concrete 6h can be dismantled.

Four, calcination temperature and time are the key to determine the activity and dispersion of MgO.

Whether it is magnesite or dolomite ore, the decomposition reaction of that kind of raw material in calcination is endothermic reaction. Due to the decomposition of CO2 and H2O, the production of MgO with multi pore crystal structure is good, and the degree of dispersion is great (180m2/g), when the product is at 400 C to 600, then the product is fined after a few minutes at normal temperature. A good calcining process should reduce the quality of energy products when the temperature is controlled at 400 to 600 C. When the temperature is higher than 900, the crystal densification and dispersion are only 3m2/g, and the Magnesium Oxide under the normal temperature of 95% needs 75d. to see that MgO reaches 0.425nm at 400 C and Mg (OH) reaches 0.424nm. At this time, the product has the best activity. That is to say, the light burning temperature at 400 to 600 C is the best temperature, which is the source of the light burning powder. The longer the calcination time, the more compact the crystal structure is, it is difficult to hydrate.

Five. Several factors of the best mix ratio:

(1) the specific gravity (relative density) of the mixture.

When light magnesia concrete is prepared, the specific gravity of water solution is 1.35 ~ 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 ~ 2.0..

(two) weight ratio of light filler to Magnesium Oxide (%)

Cast-in-place lightweight concrete - 35.

Wall plate - 25.

Component - 50.

Paint - 10.

(three) the weight of water solution accounts for 1.60 to 2.0. of Magnesium Oxide.

(four) the matching ratio of Magnesium Oxide, magnesium chloride and water is 5 ~ 5.6: 1 ~ 1.2: 8 ~ 11.

The matching ratio of light filler and MgCl2 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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