Assessment of phosphogypsum use in a nursery for plant propagation

Phosphogypsum (PG) was used as substrate for the multiplication of eight ornamental species; six by cuttings and two by sowing. The results obtained showed a high rooting or percent germination for the six plants: Ficus benjamina, Pelargonium × Hortorum, Washingtonia filifera, Eucalyptus camaldulensis, Hibiscus rosa sinensis and Acalypha wilkesiana. For a percentage of 50% PG, only F. benjamina, H. rosa sinensis and W. filifera showed high percentage rooting. Plant vigour (height and biomass) depends on both species and treatment. Two species showed high sensitivity to PG during the propagation by cuttings, Nerium oleander and Myoporum laetum. We observed high variation in substrate characteristics; with 50% PG, pH was increased from 2.84 to 6.22, and electrical conductivity (EC) and gypsum concentration were reduced from 15.56 to 4.23 mS/cm from 36.23 to 11.82%, respectively. The results showed the possibility of using PG in nurseries for the multiplication and fertilization of several forest and ornamental plant species by cuttings and sowing.     

磷石膏除杂及制备精细材料的研究进展

磷石膏是磷肥生产过程中产生的工业副产物,是具有多种潜在用途的钙、硫和石膏资源.作者从资源化利用的角度介绍了磷石膏中的杂质对其性能和应用的影响,以及传统的预处理除杂方法;从高值化利用角度介绍了以磷石膏为原料制备晶须及纳米等精细材料的研究进展.     

磷石膏和碳酸氢铵制备硫铵复合肥工艺研究

利用磷石膏和碳酸氢铵制备市场价值较高的硫铵复合肥,探讨了磷石膏和碳酸氢铵体系的反应历程,研究了反应温度、反应时间、反应介质体积和质量分数对反应产物硫铵质量分数的影响。结果表明:当反应温度为45℃,反应时间为2h,反应介质体积和质量分数分别为180mL和10%时,反应产物硫铵的质量分数最高,约为43.72%。利用BK-POL型偏光显微镜观察产物硫铵溶液的自然结晶体,观察的结果为菱形柱状结晶。     

磷石膏综合利用的现状

磷石膏是磷复肥生产过程中的副产物，磷石膏的综合利用对于提高磷复肥生产厂家的经济效益及其周边环境的治理具有不可估量的潜在价值。笔者对磷石膏的后期开发利用作了详细的论述。