US Patent Issued to Northeastern University on Feb. 3 for "Method for circularly purifying metallurgical arsenic-containing acidic waste liquid and recovering sulfur" (Chinese Inventors)

ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,092, issued on Feb. 3, was assigned to Northeastern University (Shenyang, China).

"Method for circularly purifying metallurgical arsenic-containing acidic waste liquid and recovering sulfur" was invented by Hongying Yang (Shenyang, China), Yajing Chen (Shenyang, China) and Linlin Tong (Shenyang, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for circularly purifying metallurgical arsenic-containing acidic waste liquid and recovering sulfur, including the following steps: (1) adding a calcium-free arsenic removal agent into the metallurgical arsenic-containing acidic waste liquid for stirring reaction, and filtering the reaction mixture...