闪速熔炼渣再选尾矿作水泥掺料应用研究

Research on using tailings from reprocessing of flash smelting slag as cement admixture

广西金川公司选矿分厂年产闪速熔炼渣再选尾矿超110万t,Al_(2)O_(3)、CaO和MgO等活性物质含量低,为非活性材料,仅作铁质调整剂使用,价值低、用途单一。本文采用物理激发和激发剂激发对广西金川闪速熔炼渣再选尾矿进行改性,并通过试验探索其作为水泥掺料的最大掺量,得到以下结论。通过机械粉磨改变尾矿细度,可使尾矿比表面积大于404 m^(2)/kg,能达到GB12958—1999规定的75级活性材料要求;不添加任何添加剂的情况下,闪速熔炼渣再选尾矿最大掺比为20%时满足GB12958—1999规定的75级活性材料要求;添加石灰和石膏渣进行对比试验,石膏渣的激发作用没有石灰效果明显,在石灰添加5%、总掺比30%时,基本能达到GB 12958—1999规定的75级活性材料要求;使用矿渣粉和钢渣粉作为配合材料,按照总掺比50%进行试验,矿渣粉效果较明显,尾矿掺比30%时,能达到GB 12958—1999规定的75级活性材料要求。

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 Al_(2)O_(3),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.