Cavitation, by itself, is not the only critical issue for a centrifugal pump here, although it would be a substantial problem.
As I understood the original question, it involved a multi-phase fluid which contained a very high volume (70%) of gas. How would you pressurize the suction of the pump sufficiently to dissolve all of the gas into the liquid? It is this gas that creates the problem for any centrifugal pump because of their basic operating principal. That is, the fluid enters the eye (center) of the impeller and is accelerated outward via centrifugal force along the impeller vanes. Since the liquid phase is generally more dense than the gas phase, the centrifuge effect separates the two and "concentrates" the gas at the center of the impeller. Eventually the volume of gas at the center is large enough to vapor lock the pump and fluid no longer enters the suction. You can fiddle with this by removing the gas or improving the pump's ability to pass it (pardon the pun), but these efforts can only go so far.
Positive displacement pumps, on the other hand, are capable of and are routinely used to handle multi-phase fluids without damage or loss of performance.