Sodium petroleum sulfonate collector for fluorite flotation and its preparation and application method

A sodium petroleum sulfonate collector for fluorite flotation, comprising:

• sodium petroleum sulfonate and non-polar oil, wherein the molar ratio of the non-polar oil to the sodium petroleum sulfonate is 3.33-5.67, the sodium petroleum sulfonate comprises raw material oil and active substance, the molecular weight of the raw material oil is 350-450, the content of the active substance is 35%- 60%, the molecular weight of the sodium petroleum sulfonate is greater than 500 and smaller than 750, the raw material oil comprises aromatic hydrocarbon, and the content of the aromatic hydrocarbon is between 10% and 31%, the aromatic hydrocarbon comprises benzene ring hydrocarbon and naphthalene ring hydrocarbon, the content of the benzene ring hydrocarbon is between 5% and 11%, and the content of the naphthalene ring hydrocarbon is between 5% and 5.2%, the sodium petroleum sulfonate comprises active substance derived from a reaction of the raw material oil with sulfur trioxide at a molar ratio of aromatic hydrogen to sulfur trioxide between 2.4 and 5, which produces 35 to 60% yield of the active substance comprising the sulfonated petroleum sulfonate, wherein the sodium petroleum sulfonate is sodium alkylbenzenesulfonate, which is a sodium salt of straight-chain alkylbenzenesulfonic acid, the straight-chain alkyl composed of 14-18 carbon atoms with structural formula CH3(CH2)nSO3Na (n=13-17), and wherein the non-polar oil is kerosene.