Global Zinc Sulfate Heptahydrate Market By Type (Chemical Fiber Grade, Food Grade, Agricultural Grade, Medicine Grade, Feed Grade, and Technical Grade), By Application (Zinc Salt, Electrolytic Plating, Fibrogenesis, Fertilizer, Pharmaceuticals, and Feed), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028