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As a rare mineral in the nature, Hercynite is generally
artificially synthesized by the process of mixing the material at
 accurate proportion, briquetting, fusing at
high temperature in special furnace (proper paper pulp as addition agent), and
natural cooling. It should maintain the tiny reduction to avoid FeO being oxidated
to Fe2O3, and the generation of Fe during the fusing process. Hercynite shows
ven big crystal with none crystal boundary , resumbling to viyreous material under
 the microscope. Without pollution by hexavalent chrome, mainly used in large-sized cement convertor, Hercynite brick replaces present chromite brick in cement rotary kiln, lengthens the working life of lining brick (10-12 months for Chrome Magnesia Brick, 17-18 months for Hercynite Brick), highly reduces the consuming in labor and resources for refractory production, lessens the production cost, completely achieves chromite-free production in cement kiln, resolves social effects of chrome pollution. Hercynite represents high quantity chromite-free refractory of new age in cement rotary kiln.