Method for resource utilization of pineapple peel and electrolytic manganese anode slime

• Main Authors: ZENG XIANRI, TAO LIPING, LI XUEHUA, SU HAIFENG, CHEN JUNFEI, WANG YUHONG
• Format: Patent
• Language: English
• Published: 07.10.2015
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS THEREOF; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; 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

The invention provides a new method for resource utilization of pineapple peels and electrolytic manganese anode slime. The method comprises the following basic steps: (1) adding manganese anode slime into a reactor, adding pineapple peels with a mass which is 0.18 to 0.30 time of the mass of manganese anode slime and concentrated sulfuric acid with a mass which is 1.8 to 2.5 times of the mass of manganese anode slime, and regulating liquid-to-solid ratio to 3:1 to 5:1; (2) performing reaction at 90 to 98 DEG C for 4 to 8 hours, wherein the leaching rate of manganese reaches more than 95 percent; (3) obtaining residues with lead content of 46 percent, which can be used as lead concentrate; (4) adding 0.4 to 1.0 g/L waste iron scrap in filtrate, adding activated carbon according to iron-to-carbon mass ratio of 2:1 to 4:1 and performing reaction for 30 to 180mins under an agitating condition at 30 to 98 DEG C, wherein selenium is deposited in a solid phase and the recovery rate of selenium reaches 95 percent; (5) performing filtration again and then returning back filtrate for producing electrolytic manganese. The method for resource utilization of pineapple peels and electrolytic manganese anode slime has the advantages that the pineapple peels are used as reducing agent, the wastes are turned into valuable things and the method has environmental and economic dual benefits.