基于物质代谢分析的高铝煤炭循环利用全产业链评估研究
Evaluation of the whole industry chain of high-alumina coal recycling based on material flow analysis
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摘要: 高铝煤炭广泛分布于我国内蒙古中西部煤田,富含丰富的铝、硅、锂、镓等有价元素.对其进行资源协同开发,有望大幅提升我国铝资源供给体系韧性并提高固废利用率,改善燃煤电厂的飞灰堆存等环境污染问题,效益可观.该研究以大唐集团托电园区的高铝粉煤灰示范生产线为案例,解析了高铝煤炭中各类无机资源的分布规律,并在全面梳理“原料-工艺-技术-产品/副产品”匹配机制的基础上,构建了集成“高铝煤炭清洁燃烧工艺-多级预脱硅工艺-氧化铝低能耗提取工艺”于一体的高铝煤炭循环利用全产业链;采用物质代谢分析方法,研究高铝煤炭资源循环利用全过程中有价元素的迁移转化规律,建立了高铝煤炭伴生有价元素的走向与分配模型,识别了循环利用产业链中物质代谢优化调控的关键环节;此外,核算了全产业链推广应用的经济、环境与社会效益,并与传统铝土矿炼铝产业对比分析,为内蒙古高铝煤炭资源的高附加值、梯次、循环利用模式推广提供支撑.研究表明高铝煤炭循环利用全产业链中有价元素总体循环回收利用率超过80%;在内蒙古自治区推广应用该产业链, 每年可生产1303 10 4t氧化铝,联产964 10 4t活性硅酸钙和3192 10 4t硅钙渣,创造年收入389.5亿元,节约四分之一的铝土矿资源年消耗量和766 10 4t石灰石资源,保护1150公顷植被并增加固碳量426 10 4t,经济、社会和环境效益巨大.Abstract: High-alumina coal is widely distributed in coalfields of the central and western Inner Mongolia, and is rich in valuable elements such as aluminum, silicon, lithium, and gallium. Comprehensive and efficient utilization of high-alumina coal is expected to greatly improve the resilience of China's aluminum supply system and improve the utilization rate of solid waste, alleviating the environmental pollution problems such as fly ash storage in coal-fired power plants with considerable economic benefits. This study takes the high-alumina fly ash demonstration production line in the Datang Group Tuodian Park as an example, and analyzes the distribution of various inorganic resources in high-alumina coal. On the basis of comprehensively combing the matching mechanism of "raw material-production process-technology-product/by-product", an integrated industrial chain of high-aluminum coal recycling system is established, which consists of "clean combustion process of high-alumina coal—multi-stage pre-desilication process—low-energy-consumption extraction process of alumina". By adopting material metabolism analysis, the migration and transformation law of valuable elements in the industrial chain is studied, and the distribution model of associated valuable elements is established to identify key links in material metabolism optimization of the industrial chain. In addition, the economic, environmental and social benefits of the industrial chain, compared with the traditional bauxite and aluminum smelting industry, is calculated. The results provide support for the promotion of high value-added, cascade recycling patterns of high-alumina coal in Inner Mongolia. The results show that (1) the overall recycling rate of valuable elements in the entire industrial chain of high-alumina coal recycling system exceeds 80%; (2) the promotion and application of this industrial chain in Inner Mongolia Autonomous Region can produce 1303 10 4t alumina and co-produce 964 10 4t active calcium silicate and 3192 10 4t calcium silicate slag, creating an annual income of 38.95 billion yuan. A quarter of the annual consumption of bauxite resources and 766 10 4t limestone resources can be saved, and 1150 Hectares of vegetation can be protected while increasing 426 10 4t of carbon sequestration. The economic, social and environmental benefits of the industrial chain are huge.
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Key words:
- high-alumina coal /
- recycle /
- material flow analysis /
- benefit evaluation
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