Aqua Metals (NASDAQ:AQMS – Get Rating) was upgraded by Zacks Investment Research from a “sell” rating to a “hold” rating in a research report issued on Tuesday, Zacks.com reports. According to Zacks, “Aqua Metals, Inc. is involved in the business of recycling lead through a process called AquaRefining(TM). Its AquaRefining process elements consists of non-toxic […]