废碱 meaning in English

alkali waste
spend caustic
spent caustic
waste caustic

Study on acidulation process of spent alkaline zinc manganese battery
废碱锰电池焙烧干粉酸解条件的研究
Since1981 , mcr has been serving the refinging industry by removing waste refinery caustics , processing them in its plant in beijing , and recovering organic and inorganic chemicals which it markets woldwide
我的译文： mcr从1981年起就为炼厂提供清除废碱服务，在其北京的厂子加工收集的废碱，并回收其销售到世界各地的有机和无机化学品。