Method special for suction filtration of concentrated acid in cubic boron nitride

The invention provides a method special for suction filtration of concentrated acid in cubic boron nitride. The method special for suction filtration of concentrated acid in cubic boron nitride comprises the following steps: (1) preparing devices: comprising an enamel tank, a turnover device, a vacuum pump, a funnel and a liquid discharge pipe, wherein a filter screen is arranged in the enamel tank, and the enamel tank is divided into a material pool and a waste liquid pool through the filter screen; (2) introducing the reaction liquid after the reaction into an enamel tank through a funnel, enabling the reaction liquid to enter the enamel tank, blocking the material under the action of the filter screen, and enabling concentrated acid to fall into the enamel tank; and (3) discharging the concentrated acid through a liquid discharge pipe, and collecting the concentrated acid. The method special for suction filtration of the concentrated acid in the cubic boron nitride has the advantages that the operation is