ARSENIC ADSORBENT AND METHOD FOR IMMOBILIZING ARSENIC USING THE SAME

• Main Authors: HIROYOSHI NAOKI, OKAMOTO HIDEMASA, KAWAI TAKAYASU, SAWADA MITSURU, SATO TSUTOMU, ITO MAYUMI
• Format: Patent
• Language: English
• Published: 03.10.2013
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an arsenic adsorbent capable of efficiently adsorbing and immobilizing arsenic contained in a leaching liquid or residual liquid of solvent extraction in heap leaching or bacteria leaching.SOLUTION: This objective arsenic adsorbent is obtained by adding a Cu(II)-containing solution to a solution containing Fe(II) and Fe(III), for example, a solution obtained from a leaching and SX process to react at pH 3 to 4 and 60-70°C. It is preferable that the density of Fe(II) is ≤2/3 of the whole Fe density, and a Cu(II) density after addition is ≥1/10 of the Fe(II) density.