Rough extraction method for cordierite type waste automobile tail gas three-way catalyst

The invention discloses a rough extraction method for a cordierite type waste automobile tail gas three-way catalyst. According to the method, under the specific condition of a proper amount of HF liquid, the SiO2-Al2O3 bond in the waste automobile tail gas three-way catalyst is opened, gamma-Al2O3 and part of cordierite structures (2MgO.2Al2O3.5SiO2) are destroyed, and part of Si in the waste automobile tail gas three-way catalyst is separated in a differentiation manner; then, the waste automobile tail gas three-way catalyst is further treated under the specific condition through the pressurizing alkaline leaching technology, part of Al, Si and the like in the waste automobile tail gas three-way catalyst are selectively dissolved out, finally, a platinum group metal enriched body is obtained, a sodium aluminate solution obtained through pressurizing alkaline leaching is subjected to enhanced decomposition through microwaves, hydrated alumina is obtained, and recycling of aluminum in the waste automobile tail gas three-way catalyst is achieved.