油基钻屑制备水泥熟料的试验研究

Experimental research on preparation of cement clinker from oil-based drilling cuttings

为实现页岩气行业可持续发展,推动油基钻屑的综合利用,解决油基钻屑环境污染问题,探索了以油基钻屑为原料制备水泥熟料的热工工艺及合理配方,选取6种不同配方的水泥生料在不同温度下进行了水泥熟料煅烧试验。研究表明,油基钻屑的矿物组分与黏土相似,经预处理后,油基灰渣可以作为水泥原料,但是掺入质量分数不得超过30%;以油基灰渣作为原料制备水泥熟料时,随油基灰渣质量分数的增加,水泥生料易烧性变差,煅烧温度降低,C_(3)S质量分数降低,C_(2)S质量分数增加;BaO对水泥熟料的烧成和矿物结晶状况影响较大,当温度为1300℃时,BaO掺量最佳值为1.5%,当温度超过1350℃时,随着BaO质量分数的增加,f-CaO的质量分数增加。

In order to realize the sustainable development of shale gas industry,promote the comprehensive utilization of oil-based drilling cuttings(OBDCs)and solve the environmental pollution problem of OBDCs,the thermal process and reasonable formula of cement clinker preparation using OBDCs as raw material were explored.Six kinds of cement raw materials with different formulations were selected for calcination test of cement clinker at different temperatures.The experimental results show that the mineral composition of OBDCs is similar to that of clay.After pretreatment,the oil-based ash can be used as cement material,but its mass fraction must not exceed 30%.When the oil-based ash is used as raw material to prepare cement clinker,with the increase of the oil-based ash,the burnability of cement raw material becomes worse,the calcination temperature decreases,the mass fraction of C_(3)S decreases,while the mass fraction of C_(2)S increases.In addition,BaO has great influence on the sintering and mineral crystallization of cement clinker.When the calcination temperature is 1300℃,the optimal value of BaO content is 1.5%;When the calcination temperature is higher than 1350℃,the mass fraction of f-CaO increases with the increase of the mass fraction of BaO.