铬渣零排放绿色化工新过程

A NOVEL GREEN PROCESS OF ZERO EMISSION OF CHROMIUM-CONTAINING RESIDUE

提出了碳酸化解离铬渣－镁提取－干湿法协同解毒－富铁渣制备铁氧体的铬渣零排放的绿色化工新过程．实验结果表明，提高二氧化碳分压和液固比、降低反应温度将增加镁的提取率；外加超声波场将大大强化镁的提取率，同时也加速了碳酸镁的分解速率；溶液中添加碳酸氢铵后，降低了镁的提取率．利用毒性铬渣可制备纯度高的轻质碳酸镁和氧化镁产品；提取镁后的富铁渣经还原焙烧和磁选后可制备磁性铁氧体材料．

A novel green process for zero emission of chromium-containing residue is developed which consists of carbonate decomposition of chromium-containing residue, magnesium extraction, Cr 6+ detoxification, and preparation of magnetic ferrite Effects of reaction temperature, CO 2 partial pressure, liquid to residue ratio, addition of ammonium carbonate and applying ultrasonic field on the yield of magnesium in carbonate leaching experiments are investigated under the atmospheric condition High-purity product of magnesium oxide and magnesium carbonate light are prepared from the chromium-containing residue Magnetic ferrite is prepared from the ferric-riched residue by hydrogen reduction