中国有色冶金

The Concentrator of Guangxi Jinchuan Nonferrous Metals Co., Ltd. produces over 1.1 million tons/a of tailings from reprocessing flash smelting slag, with a low content of active substances of Al₂O₃ CaO and MgO. As inactive material, they can only be used as iron regulator with low value and single purpose. In this paper, the physical excitation and excitant excitation are used to modify the tailings from reprocessing of flash smelting slag of Guangxi Jinchuan Nonferrous Metals Co., Ltd. The maximum addition volume of taillings as cement admixture is explored through test to reach the following conclusion. The tailings fineness is changed through mechanical pulverization to make the specific surface area of tailings reach above 404 m2/kg, which can meet the requirement of Grade 75 active material stipulated by GB 12958—1999; without adding any additives, the maximum addition ratio of tailings from reprocessing of flash smelting slag as 20% meets the requirement of Grade 75 active material stipulated by GB 12958—1999; a comparison experiment was made by adding lime and gypsum residue. It proves that the excitation effect of gypsum residue is less significant than that of lime. While adding 5% lime with total addition ratio of 30%, the requirement of Grade 75 active material stipulated by GB 12958—1999 can be basically met; the test is conducted by using slag powder and steel slag powder with the total addition ratio as 50%, and the effect of slag powder is obvious. With the tailings addition ratio as 30%, it can meet the requirement of Grade 75 active material stipulated by GB 12958—1999.