GOLD RECOVERY METHOD

• Main Authors: TAKITA ERI, YAMAJI YUTA, KUROIWA TATSUHITO, SAWADA MITSURU
• Format: Patent
• Language: English; Japanese
• Published: 03.12.2015
• Subjects: 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; 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; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a gold recovery method enabling gold to be recovered from ore containing arsenic and gold such as arsenopyrite at a high recovery rate.SOLUTION: The gold recovery method is provided for recovering gold from ore containing arsenic and gold and comprises a middle treatment step of dissolving the ore, and a leaching step of bringing a solution containing cyan into contact with the dissolved ore thereby leaching out gold. It is preferable that the arsenic contained in the ore is leached at a dissolution rate equal to 60% or more in the middle treatment step. In the middle treatment step, in concrete terms, an alkali dissolution process of dissolving ore by an alkaline solution and a high pressure oxidation process of dissolving ore in high pressure oxidation atmosphere are performed. 【課題】例えば硫砒鉄鉱のような砒素と金を含有する鉱石から、高い回収率で金を回収することができる金の回収方法を提供する。【解決手段】本発明は、砒素と金とを含有する鉱石から金を回収する金の回収方法であって、鉱石を溶解させる中間処理工程と、溶解させた鉱石に対しシアンを含有する溶液を接触させ金を浸出させる浸出工程とを有することを特徴としている。その中間処理工程では、鉱石に含まれる砒素を６０％以上の溶解率で溶解させることが好ましい。具体的に、その中間処理工程では、例えば、アルカリ溶液により鉱石を溶解させるアルカリ溶解処理、加圧酸化雰囲気中において鉱石を溶解させる加圧酸化処理等を行う。【選択図】図１