重質氧化鎂Heavy Magnesium Oxide氧化鎂是鎂的氧化物。純凈氧化鎂的物理化學性質：比重3.58，莫氏硬度4—5，熔點2800℃。氧化鎂不溶于水，但能從空氣中逐漸吸收水分和二氧化碳結塊和變質。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.由于它的性質，所以廣泛被應用于摩擦材料中。它可起到橡膠硫化、樹脂固化催化劑的作用，并能提高磨擦材料致密性和耐高溫性能，減少熱衰退。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.目前市場上銷售的氧化鎂有輕質氧化鎂、輕燒氧化鎂、重質氧化鎂。通常是用菱鎂礦、白云石和鹵水為原料生產的。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.輕燒氧化鎂是由菱鎂礦在750-950℃煅燒而成，二氧化碳析出不完全，約含CO2 3-5%,比重3.0-3.2，呈白色或淡黃色，化學活性強，在空氣中極易吸收水分和二氧化碳變質。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.重質氧化鎂是由菱鎂礦在1500-1800℃煅燒而成，二氧化碳基本完全析出，約含CO2 0-1%,比重3.45-3.58，呈茶褐色，化學活性較弱基本無活性，只有潮濕空氣中才能吸收水分和二氧化碳變質。本公司產品采用國內優質礦石經高溫燃燒粉碎篩分而成，含MgO 97%以上，具有揮發份少、性能穩定，達到國外進口產品水平。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.輕質氧化鎂可由兩種方法生產。light magnesium oxide production by two methods（1） 煅燒菱鎂礦或白云石：主要工藝流程(1)Calcination magnesite and dolomite :Main Process 煅燒菱鎂礦或白云石---消化—二氧化碳酸化---分離---脫水煅燒---粉碎—成品Calcination magnesite and dolomite-slaking - Carbon dioxide acidification -To separate -Drying and calcination-grinding- finished goods主要化學方程式：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)鹵水氨化法：主要工藝流程(2) Brine ammoniation method:Main Process鹵水氨化法—脫水—干燥—煅燒 –粉碎—成品Brine ammoniation method - Dehydration -drying- calcination -grinding- finished goods主要化學方程式：Main chemical equation:MgCl2 NH4HCO3 --- Mg(HCO3)2 NH4ClMg(HCO3)2-- MgCO3 H20 CO2 MgCO3 – MgO CO2 ↑輕燒氧化鎂、輕質氧化鎂和重質氧化鎂性質對照表Light burned magnesia、light magnesium oxide and Heavy MgO is comparison

項目Items	輕質氧化鎂light magnesium oxide			重質氧化鎂Heavy MgO	輕燒氧化鎂light burned magnesia
	特級品Best class	一級品First class	二級品Second class
外觀Appearance	白色無定形粉末 White amorphous powder	白色無定形粉末 White amorphous powder	白色無定形粉末 White amorphous powder	淡黃色粉末light yellow powder	白色無定形粉末 White amorphous powder
松裝密度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℃揮發份%≤Volatile 105℃ %≤				0.5	1
800℃灼燒損失%≤residue on ignition , 800℃ %≤	3	4	5	2.4	5
粒度325目size325m				100%通過 By 100%

從以上數據看出，重質氧化鎂生產工藝簡單，成本低，雜質含量低，性能好，特別適合摩擦材料中應用。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%。作用是減小熱衰退、減小磨損、提高中溫摩擦系數和改善恢復性能。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.