|
Both are known as fire, indirect method, also known as
French law, the direct method, also known as USA and France.
They do not like the production process, the indirect method
generally Xinding for raw materials, through the
electrolytic reduction, made of zinc oxide, Xinding
different raw materials to produce the purity or zinc oxide,
the main production of 99.5% - 99.7% The zinc oxide. Waste
is the direct method of zinc ash and zinc scrap zinc waste
as raw materials, charcoal burning and reduction of zinc
oxide generated by open hearth furnace or converter. The
process generally low-grade products at 75% - 95%, and the
high content of impurities. There is also a new approach is
ammoniation law, to direct about 75 percent of zinc oxide as
raw materials. After a special production process from 99.7%
and 99.9% of high-grade zinc oxide, the products of heavy
metals like lead content of impurities. Cadmium, and other
than the indirect method of zinc oxide low 30 times. Use
very extensive.
|
