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For the electrolytic production of zinc, the roasting of concentrating is achieved in fluidized-bed roasters, in which the divided and heated particles of concentrate are suspended in a rising stream of air. The sulfur content can be reduced to less than 0.5 percent, and a high-strength of sulfur dioxide gas is forwarded to a sulfuric acid plant. The process is thermally efficient, and the resulting calcine is in the form of small particles that can easily be leached into solution for further treatment. Therefore, using pure zinc metal is a good choice even with the disadvantage of the metal reactivity. Due to its abundant resources, zinc can be mined in six different states and 76 percent of refined zinc is imported to the United States from Canada, Mexico, Kazakhstan, and South