Abstract: In order to keep agglomerates stable under acidic conditions and improve leaching efficiency， the bioleaching of low-grade copper ore from high pressure grinding roll after agglomeration through geopolymerization was studied. The effects of geopolymer gel on the oxidation activity of microorganisms and the performances of raw materials， agglomerates and coarse-grained ores in column leaching were investigated. The properties of agglomerates were studied by means of Nuclear Magnetic Resonance （NMR） and Scanning Electron Microscope （SEM）. The results showed that the ore from the high pressure grinding roll were leached after agglomeration， and the leaching rate was 61% after 66 days， while the leaching rate of coarse-grained ores in the same time was only 28%. The geopolymer gel did not weaken the oxidation activity of the microorganisms. The permeability of raw materials was significantly improved after agglomeration， and the agglomerates could remain stable for a long time during column leaching. The formation of geopolymer gel was the reason for the stability of agglomerates under acidic conditions. After the ore particles were agglomerated through geopolymerization， there were still a large number of pores and cracks between the particles， which was beneficial for leaching. The bioleaching of low-grade copper ore from high pressure grinding roll after agglomeration through geopolymerization can make the extraction of low-grade copper ore more efficient， which is expected to be applied in the heap leaching.

Key words: Low-grade copper ore, Geopolymerization, Agglomeration, Bioleaching, Permeability, Leaching rate of the copper