钢铁
鋼鐵
강철
IRON & STEEL
2015年
4期
17-22
,共6页
张颖异%程项利%齐渊洪%邹宗树
張穎異%程項利%齊淵洪%鄒宗樹
장영이%정항리%제연홍%추종수
直接还原%高铁铝土矿%粒铁%渣相组成%氧化铝%溶出率
直接還原%高鐵鋁土礦%粒鐵%渣相組成%氧化鋁%溶齣率
직접환원%고철려토광%립철%사상조성%양화려%용출솔
direct reduction%high-iron bauxite%nuggets%slag composition%Al2O3%leaching rate
采用煤基直接还原熔分技术和氧化铝溶出的方法，研究了直接还原工艺对粒铁尺寸和粒铁收得率的影响，以及钙铝比(w(CaO)/w(Al2O3))对渣相组成和渣中氧化铝的溶出影响。结果表明，当(w(CaO)/w(Al2O3))为1.7、w(C)/w(O)为1.4、还原熔分温度为1450℃，还原熔分时间为20 min时，还原熔分过程中的粒铁尺寸最大，粒铁收得率也最高，粒铁尺寸和收得率分别为11.5 mm和93%。当(w(CaO)/w(Al2O3))为1.0时，渣相组成主要以钙铝黄长石(Ca2Al(Al，Si)2O7)为主，当(w(CaO)/w(Al2O3))为1.5时，渣相组成主要以钙铝黄长石(Ca2Al(Al，Si)2O7)、硅酸二钙(Ca2SiO4)和七铝十二钙(Ca12Al14O33)为主，当(w(CaO)/w(Al2O3))为1.7～1.9时，渣相组成主要以七铝十二钙(Ca12Al14O33)和硅酸二钙(Ca2SiO4)为主。当(w(CaO)/w(Al2O3))为1.7时，溶出时间为2.0 h时，氧化铝的溶出率最高，溶出率为87.5%，溶出率较0.5 h时提高了9.4%。因此，当渣系组成以七铝十二钙(Ca12Al14O33)和硅酸二钙(Ca2SiO4)为主时，更有利于氧化铝的溶出。
採用煤基直接還原鎔分技術和氧化鋁溶齣的方法，研究瞭直接還原工藝對粒鐵呎吋和粒鐵收得率的影響，以及鈣鋁比(w(CaO)/w(Al2O3))對渣相組成和渣中氧化鋁的溶齣影響。結果錶明，噹(w(CaO)/w(Al2O3))為1.7、w(C)/w(O)為1.4、還原鎔分溫度為1450℃，還原鎔分時間為20 min時，還原鎔分過程中的粒鐵呎吋最大，粒鐵收得率也最高，粒鐵呎吋和收得率分彆為11.5 mm和93%。噹(w(CaO)/w(Al2O3))為1.0時，渣相組成主要以鈣鋁黃長石(Ca2Al(Al，Si)2O7)為主，噹(w(CaO)/w(Al2O3))為1.5時，渣相組成主要以鈣鋁黃長石(Ca2Al(Al，Si)2O7)、硅痠二鈣(Ca2SiO4)和七鋁十二鈣(Ca12Al14O33)為主，噹(w(CaO)/w(Al2O3))為1.7～1.9時，渣相組成主要以七鋁十二鈣(Ca12Al14O33)和硅痠二鈣(Ca2SiO4)為主。噹(w(CaO)/w(Al2O3))為1.7時，溶齣時間為2.0 h時，氧化鋁的溶齣率最高，溶齣率為87.5%，溶齣率較0.5 h時提高瞭9.4%。因此，噹渣繫組成以七鋁十二鈣(Ca12Al14O33)和硅痠二鈣(Ca2SiO4)為主時，更有利于氧化鋁的溶齣。
채용매기직접환원용분기술화양화려용출적방법，연구료직접환원공예대립철척촌화립철수득솔적영향，이급개려비(w(CaO)/w(Al2O3))대사상조성화사중양화려적용출영향。결과표명，당(w(CaO)/w(Al2O3))위1.7、w(C)/w(O)위1.4、환원용분온도위1450℃，환원용분시간위20 min시，환원용분과정중적립철척촌최대，립철수득솔야최고，립철척촌화수득솔분별위11.5 mm화93%。당(w(CaO)/w(Al2O3))위1.0시，사상조성주요이개려황장석(Ca2Al(Al，Si)2O7)위주，당(w(CaO)/w(Al2O3))위1.5시，사상조성주요이개려황장석(Ca2Al(Al，Si)2O7)、규산이개(Ca2SiO4)화칠려십이개(Ca12Al14O33)위주，당(w(CaO)/w(Al2O3))위1.7～1.9시，사상조성주요이칠려십이개(Ca12Al14O33)화규산이개(Ca2SiO4)위주。당(w(CaO)/w(Al2O3))위1.7시，용출시간위2.0 h시，양화려적용출솔최고，용출솔위87.5%，용출솔교0.5 h시제고료9.4%。인차，당사계조성이칠려십이개(Ca12Al14O33)화규산이개(Ca2SiO4)위주시，경유리우양화려적용출。
Effects of the direct reduction process on the nuggets size and recovery percent were investigated by coal-based direct reduction and leaching process,and the effects of (w(CaO)/w(Al2O3)) on the slag composition and leaching rate of alumina were investigated by the same way. The results show that when the (w(CaO)/w(Al2O3)) is 1.7,w(C)/w(O) is 1.4,reduction temperature is 1 450℃,and the reduction time is 20 min,the nuggets size is biggest and the nuggets re-covery percent is highest,the nuggets size and recovery percent are 11.5 mm and 93%,respectively. When the (w(CaO)/w(Al2O3)) is 1.0,the furnace slag is mainly composed of gehlenite (Ca2Al(Al,Si)2O7),when the (w(CaO)/w(Al2O3)) is 1.5,the furnace slag is mainly composed of gehlenite (Ca2Al(Al,Si)2O7),dicalcium silicate(Ca2SiO4) and mayenite(Ca12Al14O33),when the w(CaO)/w(Al2O3) is 1.7-1.9,the furnace slag is mainly composed of dicalcium silicate (Ca2SiO4) and mayenite(Ca12Al14O33). When the (w(CaO)/w(Al2O3)) is 1.7 and leaching time is 2.0 h,the leaching rate of alumina is highest which is 87.5%,the leaching rate is increased by 9.4% than that of 0.5 h leaching time. Therefore, when the furnace slag is mainly composed of dicalcium silicate(Ca2SiO4) and mayenite(Ca12Al14O33),it is more conducive toleaching of alumina.
