硫酸蒸煮法去除废糖蜜中氯离子的实验研究

Experimental study on removal of chloride ion in cane molasses by sulfuric acid cooking method

利用废糖蜜作还原剂，还原浸出低品位软锰矿，是一种经济环保的还原方法，但废糖蜜中含有一定的氯离子．在实际生产过程中会对电解阳极板产生严重的腐蚀破坏作用。实验通过硫酸蒸煮法去除废糖蜜和再生废水中的氯离子，考察了反应温度、反应时间和硫酸浓度等因素的影响。实验结果表明，在硫酸质量分数为40％-45％、反应时间为2h、反应温度为80℃的条件下处理废糖蜜还原软锰矿，相对浸出率可达91．51％，符合要求。

It is a kind of economic and environmental-friendly method that leaching manganese from a low-grade pyrolusite by cane molasses as reducing agent.But a certain amount of chloride ions is found in cane molasses,which will bring serious corrosion damage to the electrolytic anode plate in production practice.Chloride ions were removed from cane molasses and regenerating wastewater by sulfuric acid cooking method.The influences of reaction temperature,reaction time, and concentration of sulfuric acid were investigated.Results showed that using cane molasses treated under the conditions, i.e.mass frac- tion of H2S04 was at 40%-45%, reaction time was 2 h, and reaction temperature was 80 ℃, to reduce the pyrolusite, the relative Mn leaching rate was 91.51%, meeting the requirements.