用化学和波谱分析研究了硫化钠预处理硫酸盐制浆中残余木质素的化学结构特性。
Residual lignins from sodium sulfide pretreatment kraft pulping were studied by chemical and spectral methods. Sodium sulfide pretreatment can promote sulfur combining chemically with lignin.
该方法是将金精矿加入硫化钠后进行焙烧预处理，可有效地提高金、银、铜的回收率。
The method that the gold concentrate adding sodium sulfide is roasted could effectually raised the recoveries of gold, silver and copper.
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