Sulfenyl polyvinylidene fluoride membrane absorbent, preparation method and method for recovering gold in wastewater

• Main Authors: XIA HUANJIN, MEI YINGXIN, LI HAIGANG
• Format: Patent
• Language: English
• Published: 09.12.2015
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a sulfenyl polyvinylidene fluoride membrane absorbent, a preparation method and a method for recovering gold in wastewater. The sulfenyl polyvinylidene fluoride membrane absorbent is prepared from a membrane casting solution, and the membrane casting solution is prepared from, by mass, 15%-20% of sulfenyl polyvinylidene fluoride and 80%-85% of solvent. The invention further relates to the preparation method of the sulfenyl polyvinylidene fluoride for the membrane absorbent. The preparation method for the sulfenyl polyvinylidene fluoride membrane absorbent comprises the steps of material matching, membrane forming and membrane absorbent obtaining. The sulfenyl polyvinylidene fluoride membrane absorbent has the advantages of being high in gold selectivity and recovery speed, low in operation pressure, high in absorbent capacity utilization rate and the like; according to the method for selectively recovering the minor amount of gold from the wastewater through the membrane absorbent, the advantages of affinity adsorption and membrane filtration are combined, and the problems that in the traditional technology, gold recovery is incomplete and the gold purity is low are solved.