Each method has its advantage and weakness, but the method of no pollution and high productivity is more and more concerned by people.

Using the technology of fermentation bed of organic ecological fungus to raise chickens,the results show that the chicken house was of no odor and no pollution.

Relation of open-circuit voltage and oxygen content in molten metal during unpolluted deoxidization;

Researches on metallurgy with controlled oxygen flow for unpolluted deoxidation for molten metal and extraction of metal from oxide dissolved in ionic melt are introduced.

Solid electrolyte, electronic conduction materials and deoxidizer are integrated to make into a deoxidization unit which is used in examination of the unpolluted deoxidization without inclusion for steel melts.

This paper introduced the improves of roasting-sodium processing and such pollution-free processing as acid leaching-extration,roasting in air-acid leaching-extration,liming roasting-alkali leaching on extraction of V_2O_5 from stone coal,the total recovery rate obtains enhances,the industrial application prospect is good.

Extracting Co and Cu from cobalt white alloy in hydrochloric acid solution system with pollution-free oxidant are studied.