Method for selectively recovering heavy metals from electroplating sludge

• Main Authors: JI HAIYAN, WANG ZHONGBING, LIU CHUNLI, LI YINGPENG, ZENG GUISHENG, LUO XIUYU, ZHANG JIEFEI, LIU CHANG, GUAN QIAN, ZHOU LEI
• Format: Patent
• Language: Chinese; English
• Published: 20.11.2020
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for selectively recovering heavy metals from electroplating sludge. The method particularly comprises the steps that: step (1), the electroplating sludge, ammonium chloride and water are mixed in proportions, then wet milled with a ball mill and then taken out for drying; step (2), a product obtained in step (1) is dissolved in water, filtered with suction, and washed with deionized water; step (3), a certain amount of 30% hydrogen peroxide is added to a solution obtained in step (2), the concentration of each heavy metal element is determined after standing for a period of time, and the extraction rate is calculated; step (4), a solution in step (3) is taken and adjusted by ultrasonic under 80W-120W conditions and is added a precipitation agent to adjust the pH, so that the heavy metals in the electroplating sludge are precipitated step by step in the form of hydroxides. The method efficiently extracts the heavy metal elements in the electroplating sludge through wet ball mil