基于非均相体系沥青抽提液中的矿粉清除方法

Removing method of mineral powder from asphalt extraction liquid based on heterogeneous system

针对目前常规方法不能有效去除沥青抽提液中矿粉的问题,研究利用非均相物系分离理论对回收液中的矿粉进行沉降分析,推导得出重力沉降和离心沉降的沉降速度及沉降时间的计算模型,根据试验原材料、仪器规格选择计算参数,计算得出矿粉的沉降速度及沉降时间,并通过试验验证了计算模型的准确性;同时调整了计算参数,总结得出了适用于绝大多数基质沥青抽提液的矿粉沉降计算模型。研究结果表明:计算模型具有较高的准确性与可靠度;离心加速度越大,矿粉密度越大,矿粉沉降时间就越短;施加相对离心力不小于24 647N/kg(2 515g)、离心分离时间不少于50min,能够有效地消除沥青抽提液中的矿粉。

Aimed at ineffectiveness of mineral powder removing from asphalt extraction liquid, heteroge- neous content system theory of separation was used to analyze the mineral powder sedimentation. Com- putation models of sedimentation velocity and sedimentation time about gravitational sedimentation and centrifugal sedimentation were built. Sedimentation velocity and sedimentation time were calculated based on materials and instrument specification, and the computed results were proved to be exact by experi- ments. With adjustment of calculation parameters, calculation models for mineral powder sedimentation from most asphalt extraction liquids were proposed. The results show that the calculation models are of high accuracy and reliability; the sedimentation time of mineral powder will decrease when the centrifugal acceleration and mineral powder density increase. Applying relative centrifugal force not less than 2 515 g with the time for centrifuging not less than 50 min, mineral powder will be removed from asphalt recycling effectively. 2 tabs, 1 fig, 10 refs.