Manufacturing method of magnesium fluorosilicate using ferro-nickel slag by mechanochemistry

摘要

PURPOSE: A method for preparing magnesium fluorosilicate using ferro-nickel slag based on mechanochemistry treatment is provided to prepare expensive magnesium fluorosilicate by using waste resources, ferronickel slag and hydrofluorosilicic acid. CONSTITUTION: Ferronickel slag is milled by a vibrating mill or a ball mill to obtain ferronickel slag fine powder. The ferronickel slag fine powder is mixed with hydrofluorosilicic acid based on a mechanochemistry activating process. A stirring process, a filtering process, and a crystallizing process are implemented to obtain magnesium fluorosilicate. The chemical composition of the ferronickel slag is 60-70 weight% of silicon dioxide, 25-30 weight% of aluminum oxide, 0.1-0.5 weight% of iron, 0.1-0.4 weight% of sodium, and 0.1-0.4 weight% of vanadium. The magnesium fluorosilicate functions as retarders.