假白榴正长岩烧结反应过程的热力学分析与评价

在综合分析假白榴正长岩物相组成的基础上,以碳酸钠为助剂,分解假白榴正长岩中主要矿物相，对其进行热力学分析,并与石灰石烧结法进行比较。烧结反应实验结果表明,采用碳酸钠为助剂,假白榴正长岩粉体在760～880 ℃条件下反应10～15 h,矿石中主要矿物的分解率可达971％。热力学计算结果表明,纯碱烧结法处理1 t假白榴正长岩矿石,消耗Na2CO3 065 t,且约95％的Na2CO3可以回收循环利用,消耗标准煤19097～20682 kg,排放CO2 077～081 t,一次性资源消耗量、标准煤耗、温室气体CO2排放量分别比石灰石烧结法分别减少了65％、63％、65％。纯碱烧结法具有一次性资源消耗低、能耗低和温室气体CO2排放量少等优点,工业化应用前景十分广阔。

Sintering reaction of pseudoleucite syenite: Thermodynamic analysis and process evaluation.

Based on comprehensive analysis of the modal composition of a pseudoleucite syenite ore collected from the Zijin Hill of Lin County, Shanxi Province, we carried out a thermodynamic analysis of pseudoleucite syenite sintering process with sodium carbonate as the additive. It indicates that when the pseudoleucite syenite was sintered at 760880 ℃ for 1015 h, with the sodium carbonate as the additive, the decomposition rate of minerals in the pseudoleucite syenite could reach 971％. The thermodynamic calculation shows that it needs to consume 065 t of Na2CO3 in treating pseudoleucite syenite ore per ton, and about 95％ Na2CO3 could be recycled. This process consumed (229248)×10-6 kJ of heat energy, corresponding to 1909720682 kg of standard coal and the thermal efficiency was 40％; the CO2 emission is 077081 t. Compared with the Russian limestone sintering technique, the consumption of natural mineral resources and energy, and greenhouse gas emissions in soda sintering technique could be reduced by 65％, 63％ and 65％, respectively. Therefore, the procedure suggested in this paper has broad prospects in industrial applications for its economic benefits and environmental friendliness.