Global High Purity Magnesium Oxide Market By Type (Pharmaceutical Grade Magnesium Oxide , Food Grade Magnesium Oxide , and Synthetic Magnesium Oxide ), By Application (Oriented Silicon Steel , Silicon Steel Coating , Pharmaceutical Industry , Food Industry , Electrician Magnesium , Hydrotalcite , and Rubber Industry ), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029