玻纤工业废耐火砖中铂铑金属微波碱熔活化-水溶酸浸富集工艺

Microwave-heated Alkali Activation,Water Dissolving and HCl Leaching of Used Firebrick from Glass Fiber Industry for Enrichment of Pt and Rh

采用微波碱熔活化-水溶酸浸富集工艺处理玻纤工业废耐火砖料,使其中的铂铑金属在酸浸渣中得以富集.通过微波加热碱熔与常规加热碱熔对比实验,考察了碱熔温度、保温时间、配碱量对碱熔过程的影响.结果表明,微波辐照温度800℃、保温时间30min、碱熔剂NaOH为样品质量的1.4倍时,碱熔反应进行彻底.熟料经水溶后,在最优条件下酸浸,在盐酸浓度3mol/L、浸出时间5min、酸料比15mL/g的条件下,料浆过滤性能良好,出渣率2.98%,铂铑金属可富集约33倍.

The process of microwave alkali-activation, water dissolving and HCI leaching to beneficiate Pt and Rh from discarded firebrick of glass fibre industry was studied. Comparison tests of microwave alkali-activation and conventional alkali-activation for discarded firebrick were carried out to investigate the effects of activation temperature, heating preservation time and additive dosage on alkali-activation reaction. The results show that the reaction is completed thoroughly when the test sample is alkali-activated by microwave at 800 ℃ for 30 rain, with additive NaOH dosage of 140%. After the clinker is dissolved in water, the residue is leached at the optimum conditions of HCI 3 mol/L, leaching time 5 min and ratio of HCl to residue 15 mL/g. Slurry is filtrated well. The residue generation rate is 2.98%, and Pt and Rh are beneficiated about 33 times.