In　this　paper,　the　effect　of　sodium　butyl　xanthate　(NaBX)　adsorption　on　the　surface　of　bornite　at　different　pH　on　flotation　was　studied　by　adsorption　kinetic　and　thermodynamic.　The　flotation　results　demonstrated　that　the　recovery　was　the　highest　when　pH　was　9　in　NaBX　solution　(4x10(-5)　mol/L).　The　adsorption　kinetics　showed　the　reaction　of　NaBX　on　the　bornite　conformed　to　the　second　order　kinetic　equation;　it　belonged　to　the　multimolecular　layer　adsorption　of　Freundlich　model;　the　maximum　adsorption　rate　constant　was　0.30　g/(10(-6)　mol　center　dot　min),　and　the　equilibrium　adsorption　capacity　was　2.70x10(-6)　mol/g.　Thermodynamic　calculation　results　indicated　that　the　adsorption　process　was　spontaneous　chemisorption,　and　the　adsorption　products　of　NaBX　on　bornite　surface　were　cupric　butyl　xanthate,　ferric　butyl　xanthate　and　dixanthogen,　which　were　confirmed　by　infrared　spectrum　measurements.