Converting waste caustic soda from VCM production into sodium hypochlorite for purging acetylene Production of Liquid Micro-Element Fertilizer Using Scrap Alkaline Zinc-Manganese Battery and Its Effect on Corn 利用氯乙烯生产中产生的废碱制乙炔净化用次氯酸钠利用废碱锰电池研制有机微肥及肥效试验