Key Laboratory of Automobile Materials of Ministry of Education, Jilin Province Solid Waste Utilization Project Center, Department of Materials Science and Engineering, Jilin University, Jilin Prov., Changchun, 130022, China.
Environ Sci Pollut Res Int. 2019 Feb;26(6):5925-5933. doi: 10.1007/s11356-018-4013-8. Epub 2019 Jan 6.
Coal gasification fine slag (CGFS) is a kind of industrial waste that is generated from entrained-flow coal gasification with a high content of 0.5 M hydrochloric acid (HCl)-extractable silicon (Si). Si fertilizer has been widely used in agriculture to enhance the mechanical properties and yield of crops. An evaluation was actualized by analyzing HCl-extractable Si fractions and X-Ray diffraction (XRD) of different treatments (acid, alkali, salt, grind, calcination, temperature, and time) for CGFS samples and other Si source materials. The results showed that CGFS had stable HCl-extractable Si concentrations of 60 ± 2 g/kg except in the calcination treatment, which decreased the content of extractable Si by 28.2%. Furthermore, under the same processing conditions, CGFS showed a higher content of extractable Si than other Si source samples. Moreover, a rice growth experiment was carried out for 120 days in a different mass incorporation of CGFS in the greenhouse. The strength index and total Si content of the stem proved that using CGFS at 5 wt.% markedly promoted the growth of rice. The study indicated that an appropriate application of CGFS as a Si resource to an agricultural field could be considered as a viable option for safe disposal of this industrial waste.
煤气化细渣（CGFS）是一种工业废料，由气流床煤气化产生，其 0.5M 盐酸（HCl）可萃取硅（Si）含量较高。Si 肥已广泛应用于农业，以提高作物的机械性能和产量。通过分析不同处理（酸、碱、盐、研磨、煅烧、温度和时间）下 CGFS 样品和其他 Si 源材料的 HCl 可萃取 Si 分数和 X 射线衍射（XRD），对其进行了评估。结果表明，CGFS 具有稳定的 HCl 可萃取 Si 浓度为 60±2g/kg，除煅烧处理外，该浓度可使可萃取 Si 含量降低 28.2%。此外，在相同的加工条件下，CGFS 表现出比其他 Si 源样品更高的可萃取 Si 含量。此外，还在温室中进行了为期 120 天的不同质量掺入 CGFS 的水稻生长实验。茎的强度指数和总 Si 含量表明，以 5wt.%的 CGFS 用量显著促进了水稻的生长。该研究表明，将 CGFS 作为 Si 资源适当应用于农业领域，可以考虑作为安全处理这种工业废物的一种可行选择。
