利用制硫酸废渣和制药废酸制备聚合硫酸铁

以制硫酸废渣和制药废酸为原料,通过酸浸、水解、聚合制备聚合硫酸铁,考察了废酸的含量和用量以及酸浸时间对反应的影响.结果表明,废渣20 g与质量分数为40%的废硫酸60 mL反应3 h,用Ca(OH)2调节pH值至0.8～1.1,再聚合2～3 h后,可得到红棕色、粘稠的液体产品,烘干后可得淡黄色固体粉末状的固体产品.所得固体聚合硫酸铁的全铁质量分数18.9%,盐基度为11.2%,质量符合国家标准.与传统工艺相比,具有无需氧化剂、原料价廉和生产成本低等优点.     

复合型絮凝剂PAFS的研制及性能

本文用钢厂废渣、浓硫酸及粉煤灰为原料制备了聚合硫酸铝铁（PAFS）。在合成中通过正交试验，从中探索了适宜的反应条件。产品经化学分析，鉴定了它的成分和性质。并以黄河水为原水，通过与市售聚铝（PAC）做絮凝对比试验取得了良好的絮凝效果。而且原水的pH值在4．5～9之间，去浊率达到99％以上．     

含盐高湿地区沥青抗剥落剂的应用

为提高含盐高湿地区沥青混合料的水稳定性,首先采用改进的水煮法初步确定各抗剥落剂在含盐高湿环境下的合理掺量;然后对掺有不同抗剥落剂的沥青混合料进行冻融劈裂试验和动水压力冲刷劈裂试验,优选适合含盐高湿环境的抗剥落剂种类;最后进行浸水汉堡车辙试验、常规车辙试验和低温弯曲试验,确定含盐高湿环境下抗剥落剂的最佳掺量范围.结果表明:非胺类抗剥落剂A、T在老化后的性能优于胺类抗剥落剂P、H,掺有抗剥落剂A的混合料冻融劈裂强度比和冲刷劈裂强度比均最大;建议含盐高湿地区采用抗剥落剂A来提高混合料的水稳定性,其最佳掺量范围为沥青用量的0.5%~0.7%.     

负载纳米水合氧化铁活性炭去除水中铅的实验研究

通过共沉淀法制备一种负载纳米水合氧化铁活性炭,研究其对铅的吸附性能、负载前后活性炭的结构的影响,并进行TEM和XRD表征分析。利用动态小柱实验探究不同p H值、进水浓度和空床接触时间对铅吸附能力的影响,同时比较负载前后活性炭处理实际河道水中铅的吸附穿透曲线。结果表明:无定型的纳米水合氧化铁成功负载于活性炭上,负载后的活性炭显著提高了铅的吸附性能,其对铅的吸附容量随p H值、空床接触时间的增大而增加,进水浓度的变化基本不影响铅的吸附容量。以实际河道水为处理对象,得出负载前后的活性炭穿透点运行的床体积分别为1233和11004,显著提高了9倍,表明负载纳米水合氧化铁活性炭可以有效去除实际水体中的铅,具有良好的应用前景。     

黄土/聚合铝铁盐基絮凝剂的制备及性能

以煅烧黄土为原料,经FeSO4与AlCl3聚合改性制备一种生态环保型的黄土/聚合铝铁盐基絮凝剂(LPAFCS)。以COD及浊度去除率为指标,采用单因素控制变量法考察了黄土煅烧温度、FeSO4/AlCl3质量比、反应温度与pH对复合絮凝剂处理污水效果的影响,并对复合絮凝剂处理生活污水的效果进行了评价。结果表明,黄土煅烧温度为600℃,m(FeSO4)/m(AlCl3)=1:2,反应温度为60℃,pH=3时制备的LPAFCS处理污水效能最佳。其对城镇生活污水各项指标去除率均高于70%,吸附次甲基蓝和苯酚废水效果良好,且成本低廉、工艺简单和绿色环保,有实际应用前景。     

电化学方法探讨三聚磷酸钛及磁性氧化铁在有机涂层中的缓蚀机制

本文利用电化学方法研究了在油漆涂层中添加三聚磷酸钛和磁性氧化铁对金属防护性能的影响。结果表明,三聚磷酸钛作为活性防锈颜料,添加在涂层中能够极大地改善涂层的防护性能,磁性氧化铁亦不失为一种较好的防锈颜料,但性能不及三聚磷酸钛。同时亦探讨了这两种颜料的可能防锈机理。     

大剂量Si-Mn复合孕育剂在铸铁中的应用

从例证和机理两方面来说明通过大剂量Si Mn复合孕育在铸铁中的应用 ,使Mn的作用得到充分发挥 ;Mn13是提高铸铁组织中珠光体量和性能的理想元素 ;通过调节大剂量Si Mn复合孕育剂中Mn的比例来稳定和提高基体组织中的珠光体量 ,达到稳定和提高铸铁性能的目的 ,它的可操作性比通过控制化学成分来稳定和提高铸铁的性能更好更容易 ,冲天炉熔炼效果更明显。     

THERMODYNAMIC AND STRUCTURAL CHEMISTRY DISCUSSIONS FOR OXIDATIVE LEACHING OF Cu－Ni SULPHIDE ORE UNDER ATMOSPHERIC PRESSURE

ＴＨＥＲＭＯＤＹＮＡＭＩＣＡＮＤＳＴＲＵＣＴＵＲＡＬＣＨＥＭＩＳＴＲＹＤＩＳＣＵＳＳＩＯＮＳＦＯＲＯＸＩＤＡＴＩＶＥＬＥＡＣＨＩＮＧＯＦＣｕ－ＮｉＳＵＬＰＨＩＤＥＯＲＥＵＮＤＥＲＡＴＭＯＳＰＨＥＲＩＣＰＲＥＳＳＵＲＥ￥Ｗｕ，Ｗｅｎｊｉａｎ（Ｄｅｐａｒ...     

聚丙烯纤维对补偿收缩混凝土力学性能的影响

为了探究聚丙烯纤维对补偿收缩混凝土的强度和限制膨胀率的影响规律,通过对不同聚丙烯纤维掺量的补偿收缩混凝土与基准混凝土的对比试验,测出了不同聚丙烯纤维掺量下的补偿收缩混凝土的强度和限制膨胀率值。与基准混凝土测得的强度和限制膨胀收缩率值对比,得出了能使补偿收缩混凝土达到最大膨胀率和最大劈裂抗拉强度的聚丙烯的最优掺量为1.575 kg/m3,同时随聚丙烯掺量增加,补偿收缩混凝土的强度和限制膨胀率先增大后减小。     

Adherence rates to ferric citrate as compared to active control in patients with end stage kidney disease on dialysis

Introduction: Oral phosphate binders are the main stay of treatment of hyperphosphatemia. Adherence rates to ferric citrate, a recently approved phosphate binder, are unknown. Methods: We conducted a post‐hoc analysis to evaluate whether adherence rates were different for ferric citrate vs. active control in 412 subjects with end stage kidney disease (ESKD) who were randomized to ferric citrate vs. active control (sevelamer carbonate and/or calcium acetate). Adherence was defined as percent of actual number of pills taken to total number of pills prescribed. Findings: There were no significant differences in baseline characteristics including gender, race/ethnicity, and age between the ferric citrate and active control groups. Baseline phosphorus, calcium, and parathyroid hormone levels were similar. Mean (SD) adherence was 81.4% (17.4) and 81.7% (15.9) in the ferric citrate and active control groups, respectively (P = 0.88). Adherence remained similar between both groups after adjusting for gender, race/ethnicity, age, cardiovascular disease (CVD), and diabetic nephropathy (mean [95% CI]: 81.4% [78.2, 84.6] and 81.5% [77.7, 85.2] for ferric citrate and active control, respectively). Gender, race/ethnicity, age, and diagnosis of diabetic nephropathy did not influence adherence to the prescribed phosphate binder. Subjects with CVD had lower adherence rates to phosphate binder; this was significant only in the active control group. Discussion: Adherence rates to the phosphate binder, ferric citrate, were similar to adherence rates to active control. Similar adherence rates to ferric citrate are notable since tolerance to active control was an entry criteria and the study was open label. Gender, race/ethnicity, nor age influenced adherence.