含铬废革屑氧化脱铬方法的研究

Dechroming of Chrome Shavings by Oxidation

研究了氧化脱铬的各种影响因素如 pH、含铬革屑颗粒大小、作用时间和作用温度等对脱铬的影响。在反应过程中未使用任何其它助剂 ,H2 O2 在反应过程中分解为水和氧 ,脱铬过程中产生的Cr6+ 也能通过酸的加入 ,使其还原成Cr3 + ,故不会造成新的污染。但是单纯的氧化脱铬脱铬率是有限的 ,因此如能进一步提高含铬废革屑的脱铬率 ,此方法不失为一种有发展前途的脱铬方法。

The oxidation dechroming using hydrogen peroxide was comprehensively studied. The optimal condition, such as pH, size of shavings, time and temperature, for dechroming were obtained, in which the removal rate of chrome was 90%. As hydrogen peroxide is decomposed to oxygen and water, and Cr 6+ can be returned to Cr 3+ when filtrated liquid is acidified, so the process dose notproduce new pollute. The disadvantage of the method is that the chrome removal rate is not high enough.