轻烧镁粉的产品特点及产品优势 Product Features and Product Advantages of Light Burnt Magnesium Powder

发布日期：2015-09-20 00:00 来源：http://www.ykbhlm.com 点击：

http://www.ykbhlm.com 氧化镁（轻烧镁粉，轻烧镁球）是由41%、44%、45%、46%、47%含量菱镁矿、水镁石和由海水或卤水中提取的氢氧化镁经800~1000℃左右煅烧，使其分解排出CO2或H2O，即得到轻烧镁粉，也称轻烧氧化镁、苛性氧化镁或轻烧镁，俗称苦土粉。轻烧镁粉质地疏松、化学活性大，既可以用于制造镁水泥、菱镁建材制品、隔热保温材料等，又是二步煅烧法生产优质镁砂的中间产物。

菱镁矿加热时，600℃左右出现等轴晶系方镁石；到650℃时等轴晶系方镁石消失，有非等轴方镁石产生；850℃时等轴晶系方镁石完全消失。这些方镁石晶格，由于出现点状缺陷和位错而具有较高的表面能。MgO的晶格比MgCO3晶格群水不了多少，因而晶格间孔隙增大，气孔率高，比表面积大，且具有高的活性。

轻烧镁粉呈淡黄、淡褐色粉末，粒度大多在-100目以下，方镁石结晶很小（＜3μm），真比重3.07~3.22，积堆积密度0.8~1.2g/cm3，折射率1.68~1.70，晶格常数大（α=0.4212）晶格缺陷多，质地松脆，具有孔结构，反应活性大，易进行固相反应或烧结，与水作用生Mg(HO)2而硬化，有粘结能力。由菱镁矿煅烧而成的轻烧氧化镁粉，体积收缩5%左右；通常由于未完全分解而残留有3%~5%的CO2。

菱镁矿的轻烧温度、轻烧时间对轻烧镁粉的活性有一定影响。将菱镁矿分别于600、650、700、750、800、850和900℃进行煅烧，在15~90分钟内700、750和800℃的煅烧温度对轻烧镁粉的活性没有明显的影响；600、650、850、900℃对活性的影响特别显著，600、650℃煅烧时，活性随着时间的延长明显增加；850、900℃煅烧时活性随着烃烧时间延长而明显下降。

http://www.ykbhlm.com Magnesium oxide (lightly burned magnesium powder, lightly burned magnesium balls) is composed of 41%, 44%, 45%, 46%, 47% magnesite, brucite and seawater or brine The extracted magnesium hydroxide is calcined at about 800 ~ 1000 ° C to decompose and discharge CO2 or H2O, to obtain lightly burned magnesium powder, also called lightly burned magnesium oxide, caustic magnesia or lightly burned magnesium, commonly known as bitter earth powder. Light-burned magnesium powder has a loose texture and high chemical activity. It can be used in the manufacture of magnesium cement, magnesite building materials, thermal insulation materials, etc. It is also an intermediate product of two-step calcination to produce high-quality magnesia.
When magnesite is heated, equiaxed periclase will appear around 600 ℃; at 650 ℃, the equiaxed periclase will disappear, and non-equal periclase will be produced; disappear completely. These periclase lattices have higher surface energy due to the appearance of point defects and dislocations. The crystal lattice of MgO is not much water than the crystal lattice group of MgCO3, so the inter-lattice pores increase, the porosity is high, the specific surface area is large, and it has high activity.
Light-burned magnesium powder is light yellow and light brown powder, most of the particle size is below -100 mesh, periclase crystals are very small (<3μm), true specific gravity is 3.07 ~ 3.22, bulk density is 0.8 ~ 1.2g / cm3, refractive index is 1.68 ~ 1.70, large lattice constant (α = 0.4212), many lattice defects, crisp texture, pore structure, high reactivity, easy to undergo solid phase reaction or sintering, and react with water to produce Mg (HO) 2 and harden. Adhesive ability. The light-burned magnesia powder calcined from magnesite has a volume shrinkage of about 5%; usually 3% ~ 5% CO2 remains due to incomplete decomposition.
The light burning temperature and time of magnesite have a certain effect on the activity of light burning magnesium powder. Calcined magnesite at 600, 650, 700, 750, 800, 850, and 900 ° C, respectively. The calcination temperatures of 700, 750, and 800 ° C within 15 to 90 minutes have no significant effect on the activity of lightly burned magnesium powder; The effects of 600, 650, 850, and 900 ° C on the activity were particularly significant. When calcined at 600, 650 ° C, the activity increased significantly with the extension of time; when calcined at 850, 900 ° C, the activity decreased significantly with the extension of the hydrocarbon burning time.

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