含铬钻井泥浆固化及影响因素

Solidification and its influencing factors for chromium-contaminated drilling mud treatment

固化技术是含铬钻井泥浆无害化处理最有效的方法。以四川西部某钻井泥浆为研究对象,选取水泥、石灰、聚铝和水玻璃作为固化处理剂,运用正交试验研究了含铬钻井泥浆实验条件。最佳试验配方是:先将泥浆含水率调整为46%,水泥、聚铝、石灰和水玻璃的添加量分别为10%、1%、3%和0.5%。固化72 h,该试验配方对六价铬和总铬的固化率分别达到93%和95%,浸出六价铬浓度符合地下水三类水标准(GB/T14848-9),浸出总铬浓度符合国家污水综合排放标准(GB5085.3-1996)。

Solidification is one of the most popular methods for chromium-contaminated drilling mud treatment. The article described the solidification method and its influencing factors for the waste mud treatment in the west of Sichuan Province. In the experiments cement, lime, aluminum chloride polymer and sodium silicate were selected as the solidification reagents. The ratio of the mixtures, mixing procedure, solidification time and pH value were considered as the main factors controlling the solidification effect. The orthogonal experimental results showed that the optional method for drilling mud solidification might be adjusting the mud water content to 46% , then adding cement, lime, aluminum chloride polymer and sodium silicate with a ratio of 10% , 1% , 3% and 0.5% respectively with 72 hours solidification. The leaching test revealed that this solidification methods can remove 93% Cr（VI） and 95% total Cr from the mud compared with the untreated, which meets the standard of GB/T14848-9 and GB5085.3-1996.