摘要
气化渣是煤气化过程中产生的一种含碳量较高的固体废弃物,目前主要通过填埋方式处理,不仅占用大量土地,污染土壤和水体,同时造成能源浪费。榆林气化渣经物理分选后得到精碳、惰性渣及细粒尾渣产品,精碳产品干基高位热值可达25.12 MJ/kg;惰性渣产品包括脱碳粗尾矿及脱碳细尾矿,所采集2种尾矿样品成分均以SiO_(2)、Al_(2)O_(3)、CaO、Fe_(2)O_(3)为主,烧失量分别为1.53%、1.20%。对2种尾矿样品磨细后在不同掺量下制备水泥胶砂,强度活性指数分别达75%、79%;15%掺量下,2种脱碳尾矿胶砂的抗折强度、抗压强度与纯水泥胶砂较接近,该掺量条件下,2种脱碳尾矿可替代部分水泥进行建材化综合利用。纯水泥胶砂及掺尾矿胶砂在3 d龄期时均发生水化反应,生成片状结构及针状条。110 d龄期时,纯水泥胶砂水化产物针状条更加致密,互相交错;而掺配脱碳尾矿的水化产物中针状条基本消失,颗粒之间逐渐形成统一整体。
Coal gasification slag is a kind of solid waste with high carbon content produced in the process of coal gasification.At present,it is mainly treated by landfill,which not only occupies a lot of land,pollutes soil and water,but also causes energy waste.After physical separation of Yulin gasification slag,clean carbon,inert slag and fine tail gasification slag products can be obtained.The dry basis gross calorific value of clean carbon can reach 25.12 MJ/kg.Inert slag products include decarburized coarse tailings and decarburized fine tailings.The two tailings samples collected are mainly composed of SiO_(2),Al_(2)O_(3),CaO and Fe_(2)O_(3),with the loss on ignition of 1.53%and 1.20%respectively.Two kinds of tailings samples were ground to prepare cement mortar with different dosage,and the strength activity index reached 75%and 79%respectively.When the cement is replaced by 15%,the flexural strength and compressive strength of the two decarburized tailings mortar are close to that of pure cement mortar.Under the condition of this content,the two decarburized tailings can replace part of cement for comprehensive utilization of building materials.Both the pure cement mortar and the mortar mixed with tailings have hydration reaction at the age of 3 days,resulting in flaky structure and needle shaped strips.At the age of 110 days,the needle shaped strips of hydration products of pure cement mortar are more dense and interlaced with each other.However,the needle shaped strips in the hydration products mixed with decarburized tailings are almost disappeared,and the particles gradually form a unified whole.
作者
于伟
王学斌
商靖鹏
张宇峰
史兆臣
王明静
YU Wei;WANG Xuebin;SHANG Jingpeng;ZHANG Yufeng;SHI Zhaochen;WANG Mingjing(School of Energy and Power Engineering,Xi′an Jiaotong University,Xi′an 710049,China;School of Chemistry and Chemical Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;BESINO Environment Ltd.,Shanghai 200120,China;Zhongsheng Environmental Technology Development Co.,Ltd.,Xi′an 710000,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第S02期122-127,共6页
Clean Coal Technology
基金
国家重点研发计划资助项目(2022YFB4100500)
陕西省自然科学基础研究计划资助项目(2021JLM-15)
关键词
煤气化渣
物理分选
脱碳尾矿
水泥胶砂
抗压强度
multi-pollutant removal
ceramic catalytic filter tubes
pre-dusting
flow field calculations
