首页>
外国专利>
way to the precipitation of transition metals and alkaline earth metals from blekeriavlutar by adding an alkaline liquid
way to the precipitation of transition metals and alkaline earth metals from blekeriavlutar by adding an alkaline liquid
展开▼
机译:碱性液体中从白蜡石中沉淀过渡金属和碱土金属的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Provided is a process for removing metals from a bleaching plant spent liquor and recovering a chelating agent which includes the steps of: heating a spent liquor containing a chelate comprising metals bound in a chelating agent to a temperature of at least about 140 DEG C. to break bonds in the chelate and release metals from the chelate; increasing the content of at least one of carbonate or sulphide in an alkaline material comprising at least one of green liquor or white liquor to form a carbonate or sulphide enhanced alkaline material; contacting the heated spent liquor with the alkaline material to form a solution containing precipitated metals, wherein the alkaline material is added in an amount sufficient to precipitate a majority of the released metals out of the solution; filtering the solution to separate the precipitated metals from the solution and form a filtrate containing recovered chelating agent; and supplying at least a portion of the recovered chelating agent to a chelating washing stage in a bleaching plant to bond with metals released from pulp and form a chelate. Also provided is a method of reducing encrustations.
展开▼