碳基磷灰石在矿井水深度除氟中的应用

针对某煤矿高氟矿井水,在已有“高锰酸钾预氧化+机械混凝+迷宫斜管沉淀”工艺基础上新增“调酸+高速浅层砂滤+碳基磷灰石”矿井水深度除氟工艺;利用氯化钙对高氟再生废液中氟离子进行固化,并通过“混凝+沉淀+压滤”工序实现氟化物从液相向固相转化,完成氟化物从矿井水中去除。详细介绍和总结了碳基磷灰石在矿井水除氟中的设计参数及调试经验,可为高氟矿井水治理提供参考与借鉴。

活性沸石-碳基磷灰石在小型家用净水器工艺中的应用初探

随着我国人口的增多和工农业生产活动的影响,饮用水中氨氮有不断上升的趋势。对当前在用的净水器进行工艺分析发现,氨氮和氟的净化效果不足。实验表明,活性沸石-碳基磷灰石组合净水工艺,可降低饮用水中的氨氮和氟化物,同时保留矿物质和微量元素。

Synthesis of Crystalline Hydroxyapatite from CaCO_3 and CaHPO_4·2H_2O by Mechanochemical Method

The mixture of CaHPO 4·2H 2O and CaCO 3 was ground in an aqueous system under appropriate conditions to investigate the mechanochemical reaction for the synthesis of crystalline hydroxyapatite (HA) powder. Hydroxyapatite of high crystallinity powder including trace Ca 10 (PO 4) 6CO 3(OH) and Ca 9HPO 4(PO 4) 6OH can be synthesized by mechanical activation without further thermal treatment at a high temperature. The synthesis reaction during the grinding process was almost completed within 1h. The as-ground powder exhibits a particle distribution of 20-100nm in size with a spherical or rodlike morphology. The composition and degree of crystallinity of the mechanochemical synthesized hydroxyapatite powders were coincident with the cement-type hydroxyapatite.

新型除氟滤料在河南濮阳地区农村饮用水安全工程中的应用

濮阳地区是河南省高氟地下水分布最严重的地区之一。采用自主研发的新型碳基磷灰石除氟滤料对濮阳地区高氟水分别进行微柱测试、家用净水机试验以及集中供水工程设备的出水监测。考察了微柱中新型除氟滤料与常见的活性氧化铝、活化沸石除氟滤料在相同条件下的性能比较,测试了家用净水机的再生性能,监测了集中供水除氟设备的出水氟含量。结果表明,新型碳基磷灰石除氟滤料性能显著,相同条件下除氟性能是活性氧化铝的5.09倍,是活化沸石的11.7倍,出水氟含量小于0.2 mg/L,再生后除氟性能稳定,完全符合《生活饮用水卫生标准》(GB 5749-2006)的要求。因此,能够适应濮阳地区农村饮用水安全的高氟水处理。