Optimization of Processing Technology of Pyrolusitum by Orthogonal Design

Abstract:

Objective: To optimize processing technology of pyrolusitum. Method: Taking the content of MnO₂ as index, orthogonal test was designed to optimize processing technology of pyrolusitum with processing temperature, the amount of vinegar and processing time as factors.Effects of processing technology on the content of MnO₂ and microscopic morphology of pyrolusitum before and after processed were investigated. Result: The best processing technology of pyrolusitum were identified as calcining for forty min under temperature of 700 ℃ with vinegar amount of 20%;Under these conditions, the mass fraction of MnO₂ in crude and processed products were (6.13±0.50)% and (7.35±3.27)%, respectively;Compared with crude products, after vinegar quenched of pyrolusitum, its transparent crystals number increased which could be observed under an optical microscope, appearance of crytals showed a lump or kidney shaped. Conclusion: This optimized technology was stable and feasible, which could provide a reference for criterion of processing technology of pyrolusitum.