The ceramsite was prepared by using Bayan Obo tailings and blast furnace slag of Baotou Steel as the main raw materials and coal gangue as pore-forming agent,and the process system and the performance of ceramsite wer...The ceramsite was prepared by using Bayan Obo tailings and blast furnace slag of Baotou Steel as the main raw materials and coal gangue as pore-forming agent,and the process system and the performance of ceramsite were optimized.The phase transformation rules of the ceramsite prepared by multi-source solid waste in sintering method were clarified.The influence of sintering process parameters on ceramsite performance and the purification effect of ceramsite on ammonia nitrogen wastewater were revealed.The results show that the reasonable proportion of raw materials for preparing ceramsite is 60%tailings,35%blast furnace slag and 5%coal gangue.The reasonable preparation process of ceramsite is preheating at 350℃ for 12 min,increasing the temperature to 750℃ and holding for 60 min,then increasing the temperature to 1130℃ and roasting for 20 min.The cooling method is to cool down with the furnace.The prepared ceramsite has compressive strength of 1.89 MPa,porosity of 51.31%,water absorption of 31.42%,and bulk density of 1.94 g/cm^(3).When the ceramsite is used to treat ammonia nitrogen wastewater,the removal rate of ammonia nitrogen is 47.33%.展开更多
江西某白钨矿在“双碳”背景下,围绕节能减排和节约土地(林地)资源为目的进行选矿试验研究,通过采用XRT分选粗抛废石、螺旋溜槽+摇床分级重选抛尾砂,实现粗抛早抛,废石、尾砂总产率为87.67%,WO_(3)品位降为0.04%,粗抛早抛可以降低选矿...江西某白钨矿在“双碳”背景下,围绕节能减排和节约土地(林地)资源为目的进行选矿试验研究,通过采用XRT分选粗抛废石、螺旋溜槽+摇床分级重选抛尾砂,实现粗抛早抛,废石、尾砂总产率为87.67%,WO_(3)品位降为0.04%,粗抛早抛可以降低选矿作业能耗30%左右,粗抛早抛效果显著。摇床精矿和细泥采用浮选工艺进行选别,获得的选矿指标(全矿)为:钨精矿1产率0.31%、WO_(3)品位75.20%、WO_(3)回收率为56.32%,钨精矿2产率0.18%、WO_(3)品位46.10%、WO_(3)回收率为20.05%,WO_(3)总回收率达76.37%,选矿效果良好。对粗抛早抛的废石和尾砂进行综合利用分析,废石满足建筑用碎石要求,尾砂满足机制砂特细砂要求。经估算,对废石和尾砂进行综合利用,大约节约土地(林地)16公顷,节约陆地碳汇1684.64 t C,“双碳”效果明显。展开更多
基金supported by the National Key Research and Development Program of China(2020YFC1909100 and 2020YFC1909105)the Major Science and Technology Project of Inner Mongolia Autonomous Region(2021ZD0016)the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region(NJYT22060)。
文摘The ceramsite was prepared by using Bayan Obo tailings and blast furnace slag of Baotou Steel as the main raw materials and coal gangue as pore-forming agent,and the process system and the performance of ceramsite were optimized.The phase transformation rules of the ceramsite prepared by multi-source solid waste in sintering method were clarified.The influence of sintering process parameters on ceramsite performance and the purification effect of ceramsite on ammonia nitrogen wastewater were revealed.The results show that the reasonable proportion of raw materials for preparing ceramsite is 60%tailings,35%blast furnace slag and 5%coal gangue.The reasonable preparation process of ceramsite is preheating at 350℃ for 12 min,increasing the temperature to 750℃ and holding for 60 min,then increasing the temperature to 1130℃ and roasting for 20 min.The cooling method is to cool down with the furnace.The prepared ceramsite has compressive strength of 1.89 MPa,porosity of 51.31%,water absorption of 31.42%,and bulk density of 1.94 g/cm^(3).When the ceramsite is used to treat ammonia nitrogen wastewater,the removal rate of ammonia nitrogen is 47.33%.
文摘江西某白钨矿在“双碳”背景下,围绕节能减排和节约土地(林地)资源为目的进行选矿试验研究,通过采用XRT分选粗抛废石、螺旋溜槽+摇床分级重选抛尾砂,实现粗抛早抛,废石、尾砂总产率为87.67%,WO_(3)品位降为0.04%,粗抛早抛可以降低选矿作业能耗30%左右,粗抛早抛效果显著。摇床精矿和细泥采用浮选工艺进行选别,获得的选矿指标(全矿)为:钨精矿1产率0.31%、WO_(3)品位75.20%、WO_(3)回收率为56.32%,钨精矿2产率0.18%、WO_(3)品位46.10%、WO_(3)回收率为20.05%,WO_(3)总回收率达76.37%,选矿效果良好。对粗抛早抛的废石和尾砂进行综合利用分析,废石满足建筑用碎石要求,尾砂满足机制砂特细砂要求。经估算,对废石和尾砂进行综合利用,大约节约土地(林地)16公顷,节约陆地碳汇1684.64 t C,“双碳”效果明显。
