脱硫灰与钾矿石复合生产钾钙硅镁硫肥料研究

对脱硫灰与钾矿石复合生产钾钙硅镁硫肥的研究意义、反应原理、生产流程、环境安全性能以及施肥方法等进行了介绍和评估,并对其应用前景进行了展望。研究结果表明:利用脱硫灰与钾矿石复合生产钾钙硅镁硫肥在理论上可行;生产出的产品中硫酸钾的含量达10.34%～12.0%,枸溶氧化钙19.06%～32.28%,枸溶二氧化硅10.98%～14.46%,枸溶氧化镁1.46%～1.82%。产品的pH值从原脱硫灰的10.65下降到9.60。重金属含量低于农用粉煤灰国家标准,生产过程中不会产生SO2等有害气体污染。肥料的生产成本低于350元/t,该肥料不但可以增加土壤中钾、钙、硅、镁和硫等中微量元素的含量,而且可以提高或改善农作物的产量和品质。达到变废为宝,促进循环经济发展之目的。

Study on a compound fertilizer with K, Ca, Si, Mg, and S elements by calcing a mixture of FGD residue and potassic ore

The study significance, reaction principle, manufacturing process, environmental safety assessment and applying method about manufacturing a compound fertilizer with K, Ca, Si, Mg and S elements by calcing a mixture of FGD residue and potash ore were introduced and evaluated in this paper. Meanwhile, its application prospect was also revealed. The research results showed that this process is feasible on theory completely. The manufactured fertilizer using this process contained 10.34%~12.0% K₂SO₄, 19.06%~32.28% CaO in citric acid, 10.98%~14.46% SiO₂ in citric acid, 1.46%~1.82% MgO in citric acid. The pH value in manufactured fertilizer decreased 9.60 from 10.65 in the crude FGD residue. The heavy metal concentrations in the fertilizer were far lower than that of control standards of pollutants in fly ash for agricultural use. There was not a SO₂ and other harmful gasous pollutants generated in the manufacturing process. The manufacturing cost was below 350 yuan per ton. This fertilizer could enhance medium-mass elements content of K, Ca, Si, Mg and S in soil, and promote or meliorate crop yield or quality. It would also achieve an objective to change waste into valuable, promote recycled economics development.