The Production Of Magnesia From The Waste Residues Of Ethyl Maltol

Magnesia is the core of magnesium compounds,which is very productive,widely used with many categories and specifications,and can be used as the raw material for other high-purity Magnesium Compounds.China is rich in Magnesium;its magnesite storage amount is about two thirds of the whole world.With its plenty of brine resource,China is a big country of producing magnesium and exporting magnesium salts.However,because of the low level producing technique,it is still very difficult for China to compete with those developed countries.In that case,we mainly export low-priced magnesium and low-leveled magnesium products.Meanwhile,we have to import high quality magnesia and other magnesium products from abroad when in need.As time passes,we will have wasted a large amount of precious mineral resources,which cannot be consistent with the economy sustainable development strategy of China.As a basic inorganic chemical material,magnesia can be used in heat-resisting, high temperature insulating,illuminating,analytical reagent,primary reagent,etc,it can also used in pharmacy,rubber and grease industry.This paper introduced main producing method,basic property and usage of magnesia.After producing ethyl maltol by using magnesia as odorant,there always will be two to three tons of magnesian waste residues.If emit them directly without any processing,it will not only be a waste of resource,but also do pollution to the environment.China is leading the way in producing ethyl maltol in the world,then we will emit thousands of tons magnesian waste residues every year.Therefore,it is extremely practical to turn the residues into industrial magnesia products.Based on it, we chose this problem.We aimed at the magnesian waste residues in the outgrowth of producing ethyl maltol,referred to many literatures,did a lot of experiments,found rational conditions for tuming the waste residues into industrial magnesia,we finally drew a conclusion-the reagent will be boiled out from the waste residues 60 mins later at the temperature of 80 degrees centigrade,precipitates at 80 degrees centigrade, which takes about 120-180mins.We generate precipitator by NH₄HCO₃+NH₃·H₂O, the proportion of the two elements are 1:0.6～0.7(in mass);calcining temperature is 800-900 degree centigrade,takes one hour.According to all the conditions above,we have prepared magnesian products which are consistent to the industry requirements, we also have done economical calculation and come up with practical plan which can save a great deal of money for companies.Further more,it is a good way to take advantage of industrial residues properly,deal with environment pollution and develop recycling economic.