重质氧化镁Heavy Magnesium Oxide氧化镁是镁的氧化物。纯净氧化镁的物理化学性质：比重3.58，莫氏硬度4—5，熔点2800℃。氧化镁不溶于水，但能从空气中逐渐吸收水分和二氧化碳结块和变质。MgO is Oxide of Magnesium. Pure MgO chemical and physical properties: density 3.58,s hardness 4-5,melting point 2800℃. MgO insoluble in water, but can absorb moisture and co2 from the air agglomeration and metamorphism.由于它的性质，所以广泛被应用于摩擦材料中。它可起到橡胶硫化、树脂固化催化剂的作用，并能提高磨擦材料致密性和耐高温性能，减少热衰退。Because of its nature, so widely applied in friction material. It can play rubber vulcanization, resin curing catalyst, and can improve the friction material density and high temperature resistant performance, reduce heat recession.目前市场上销售的氧化镁有轻质氧化镁、轻烧氧化镁、重质氧化镁。通常是用菱镁矿、白云石和卤水为原料生产的。Sales of MgO on the market at present is to light magnesium oxide、light burned magnesia and Heavy magnesium oxide. Usually use magnesite, dolomite and brine as raw material to produce.轻烧氧化镁是由菱镁矿在750-950℃煅烧而成，二氧化碳析出不完全，约含CO2 3-5%,比重3.0-3.2，呈白色或淡黄色，化学活性强，在空气中极易吸收水分和二氧化碳变质。Light burned magnesia by magnesite at 750-950℃, Carbon dioxide is incomplete, about 3-5%, and the proportion of CO2 3.0-3.2, white or light yellow, chemical activity in the air, water and CO2 absorbed easily.重质氧化镁是由菱镁矿在1500-1800℃煅烧而成，二氧化碳基本完全析出，约含CO2 0-1%,比重3.45-3.58，呈茶褐色，化学活性较弱基本无活性，只有潮湿空气中才能吸收水分和二氧化碳变质。本公司产品采用国内优质矿石经高温燃烧粉碎筛分而成，含MgO 97%以上，具有挥发份少、性能稳定，达到国外进口产品水平。Heavy MgO by magnesite is calcined at 1500-1800℃, Carbon dioxide is complete,about 0-1%,and the proportion of CO2 3.45-3.58,tan, brown, Chemical activity is weak, the basic without activity, only the damp air can absorb water and carbon dioxide. Using high-quality domestic ores high-temperature combustion crushing and screening, content for 97% above of MgO. it is characterized by a less volatile, properties is very stable, and to reach the level of imported products.轻质氧化镁可由两种方法生产。light magnesium oxide production by two methods（1） 煅烧菱镁矿或白云石：主要工艺流程(1)Calcination magnesite and dolomite :Main Process 煅烧菱镁矿或白云石---消化—二氧化碳酸化---分离---脱水煅烧---粉碎—成品Calcination magnesite and dolomite-slaking - Carbon dioxide acidification -To separate -Drying and calcination-grinding- finished goods主要化学方程式：Main chemical equation:MgCO3.CaCO3 --- MgO CaO CO2 ↑MgO CaO H20 --- Mg(0H)2 Ca(OH)2 Mg(0H)2 Ca(OH)2 H20 CO2 ---CaCO↓ Mg(HCO3)2 Mg(HCO3)2-- MgCO3 H20 CO2 MgCO3 – MgO CO2 ↑(2)卤水氨化法：主要工艺流程(2) Brine ammoniation method:Main Process卤水氨化法—脱水—干燥—煅烧 –粉碎—成品Brine ammoniation method - Dehydration -drying- calcination -grinding- finished goods主要化学方程式：Main chemical equation:MgCl2 NH4HCO3 --- Mg(HCO3)2 NH4ClMg(HCO3)2-- MgCO3 H20 CO2 MgCO3 – MgO CO2 ↑轻烧氧化镁、轻质氧化镁和重质氧化镁性质对照表Light burned magnesia、light magnesium oxide and Heavy MgO is comparison

项目Items	轻质氧化镁light magnesium oxide			重质氧化镁Heavy MgO	轻烧氧化镁light burned magnesia
	特级品Best class	一级品First class	二级品Second class
外观Appearance	白色无定形粉末 White amorphous powder	白色无定形粉末 White amorphous powder	白色无定形粉末 White amorphous powder	淡黄色粉末light yellow powder	白色无定形粉末 White amorphous powder
松装密度g/cm3 Porosity g/cm3	0.20	0.20	0.20	0.63
MgO含量 % ≥MgO content	95	93	92	96.5	92
105℃挥发份%≤Volatile 105℃ %≤				0.5	1
800℃灼烧损失%≤residue on ignition , 800℃ %≤	3	4	5	2.4	5
粒度325目size325m				100%通过 By 100%

从以上数据看出，重质氧化镁生产工艺简单，成本低，杂质含量低，性能好，特别适合摩擦材料中应用。From the above data, simple production technology of MgO, low cost, low content of impurities, good performance, especially suitable for the application of friction material.在摩擦材料中不同的配方用量不同。一般用量2—6%。作用是减小热衰退、减小磨损、提高中温摩擦系数和改善恢复性能。In the friction material of different dosage. Formula, 2-6% of general dosage. Function is to reduce the heat recession, reducing wear and raise the temperature coefficient of friction and improve recovery performance.