Beneficiation method for recovering petroleum drilling weighting agent

The invention provides a beneficiation method for recovering a petroleum drilling weighting agent. The beneficiation method comprises the following steps that firstly, raw ore and water are mixed in proportion to obtain a mixture; then adding sodium sulfide and a non-silicon defoaming agent into the mixture to obtain a blend; then high-speed stirring treatment is conducted, so that the raw ore and the water are fully mixed into an ore pulp state; and finally, the mixed ore pulp is subjected to classification and reselection treatment through a cyclone, and barite total concentrate is obtained after concentrate is combined. According to the beneficiation method, efficient recovery of the weighting agent in the petroleum drilling fluid is achieved, the process is simple, the grading efficiency is high, adaptability is high, the obtained product can serve as the weighting agent to be recycled, pollution of waste to the environment is reduced, and waste of resources is avoided. 本发明提供了一种用于回收石油钻井加重剂的选矿方法。该选矿方法包括如下步