含对甲基苯基侧链基团的氧肟酸赤泥沉降剂的合成与性能

合成含对甲基苯基侧链结构的氧肟酸类新型高效絮凝剂。首先以丙烯酰胺水溶液为连续相,以对甲基苯乙烯为分散相,在SPAN-60及TWEEN-80复合乳化剂作用下形成微乳液,在15~35℃下合成丙烯酰胺与对甲基苯乙烯的共聚物;然后采用程序控温方式,在60~90℃下用硫酸羟胺将酰胺羟肟化得到所需产物。用红外光谱、紫外光谱和DSC表征产物结构,用黏度法测定产物的相对分子质量。考察所合成聚合物的相对分子质量及对甲基苯基含量对氧化铝生产过程中赤泥矿浆沉降效果的影响。结果表明,氧肟酸类絮凝剂中对甲基苯基质量分数为10.5%,相对分子质量为1.1×107时,具有良好的沉降效果,并优于现行使用的国内外产品。     

混合絮凝剂对赤泥沉降效果的探讨

研究发现,当聚丙烯酰胺类A型絮凝剂和氧肟酸类H3型絮凝剂按合适的比例混合使用时,赤泥沉降沉速提高,上清液浮游物显著降低.而且,混合絮凝剂的添加量比单一絮凝剂的也要低.     

氧肟酸型淀粉合成的工艺条件实验研究

通过对淀粉的改性合成氧肟酸型淀粉 ,并系统考察了各工艺条件对产品性能的影响。     

絮凝剂的复配提高赤泥沉降效果的研究

在氧化铝厂赤泥沉降过程中,由于矿石料浆成分不稳定及沉降槽跑浑使得上清液的浮游物含量较高。为了解决这个问题,我们采用反相微乳液聚合的方法,合成了氧肟酸基絮凝剂,并同工厂现用的絮凝剂进行了复配来提高絮凝剂的沉降效果。结果表明,复配后的絮凝剂沉降效果较好,特别是上清液的浮游物含量较原来絮凝剂减少了40%。     

应用正交试验法选择合成氧肟酸型高分子的最佳工艺

用聚丙烯酸胺改性在合成氧肟酸型高分子,其转化率主要与pH值、温度、聚丙烯酰胺的分子数量、原料物料比和反应体系中电解质浓度等因素有关,通过运用正交试验法确定比五个参数的最佳值,从而选择最佳工艺条件,提高反应转化率。     

赤泥沉降用聚丙烯酰胺的合成及应用

采用均相水溶液聚合法,新型水溶性偶氮引发剂M合成了用于赤泥沉降的聚丙烯酰胺絮凝剂.通过大量实验确定了合成的优化条件为:单体浓度为25%;引发剂浓度为单体质量的0.01%;引发温度30℃;介质pH值为6;EDTA -2Na用量为15mg/L;甲酸钠用量为350μg/L.该条件下制得的聚丙烯酰胺分子量可达2000万.通过赤泥沉降实验测试了絮凝性能,相对分子质量为1200万自制絮凝剂NP2用量为30g/t-干赤泥时,沉降速度为13.5m/h.优于Nalco9779,但澄清度不及Nalco9779.     

应用改性絮凝剂加速镍铜精矿矿浆沉降及过滤速度的试验

介绍了不同种类的镍铜精矿矿浆加入适量改性絮凝剂后的沉降及过滤效果,描述了该药剂的作用机理。     

一种带有联动抽芯结构的注射模结构

在注射模设计过程中,对于塑料制品产生倒扣,无法正常出模,通常需要增加滑块或者斜顶结构。但是,当塑件倒扣位置存在碰穿的情况,内外侧都会形成倒扣,这时就需要一种联动装置来解决倒扣问题。介绍了一种带有联动抽芯装置的注射模结构。     

新型高效絮凝剂在烧结法沉降槽的工业试验及应用

新型复合高效絮凝剂在生产使用中具有用量少、效率高的特点 ,在工业试验中达到了节能、增产的目的。在试验过程中 ,不但提高了烧结法分离沉降槽的产能 ,而且降低了溢流浮游物 ,减少了进入流程中的水。新型复合高效絮凝剂在烧结法分离沉降槽工业试验的成功淘汰了使用 2 0年的A -10 0絮凝剂 ,是氧化铝近年来取得的科技进步之一     

生物法制备聚合硫酸铁及其应用研究

研究生物法制备铁系絮凝剂及其影响因素。以FeSO4·7H2O为原料,利用驯化后的氧化亚铁硫杆菌（T·f）在酸性条件下的催化氧化作用制备生物聚合硫酸铁（PFS）,并确定最佳制备条件。实验表明：在反应液初始pH值1.5、硫酸铵用量0.5g/L、初始Fe2＋浓度45g/L、接种量10%、温度30℃时,在转速为120r/min的恒温水浴摇床中连续培养5～6d、可以制出pH1.5～2.2、盐基度17.5%～22.7%、全铁含量43.87～45.24g/L的产品。实验通过处理3种废水来考察其絮凝性能,结果表明：当PFS投加量一定时,COD去除率可达70%以上,脱色率达90%,Zn2＋去除率达99%,说明PFS是一种絮凝效果优异的水处理剂。     

Basic properties of calcium phosphate cement containing different concentrations of citric acid solution

The properties of calcium phosphate cement consisting of α-tricalcium phosphate(α-TCP)and tetracalcium phosphate(TTCP)have been investigated by using a cement liquid that contained citric acid with concentration of 0.05mol/L or higher.The relationship between the setting time of the system cement and the concentration of citric acid solution shows concave type curve.When solution concentration was 0.2mol/L,the setting time was 8min,which was the shortes.While the relationship between 24h compressive strength of the cement and the citric acid concentration shows convex type curve.When solution concentration was 0.2mol/L,the compressive strength was 39.0MPa,which was the highest.Afterwards.the microstructure of the hardening product was observed by SEM,the effect of citric acid on the exothermic rate of hydrate reaction was studied by microcalorimeter,and the crushed specimens were subjected to X-ray diffraction.The results verified that the low citric acid concentration can accelerate the hydrate reaction rate of the α-TCP/TTCP system.However,the high citric acid concentration inhibited hydroxyapatite formation and retarded the rate of hydrate reaction of the α-TCP/TTCP cement.     

Synthesis and spectroscopic characterization of fluorescent solid rareearth complexes with hydroxamic acids

The complexes RE2(DHYA)3.nH2O in the title bar were synthesized through some reactions of trivalent rareearth ions.In the process of synthesis,dihydroxam,ic acids were taken as ligands while the alcohol was taken as a solvent.The ligands included adipylhydroxamic acid(ADHA),p-phthalichydroxamic acid(PPHA),oxalohydroxamic acid (OXHA),butadihydroxamic acid(BDHA),o-phthalichydroxamic acid(OPHA),benzoylhydroxamic acid(BHA),etc.Measured at 25℃,the molar conductances in various modes are 13.00-21.05 S.cm^2.mol^-1,which shows that rare-earth complexes are nonelectrolytes and the hydroxamino groups of the complexes have taken part in bonding.Infrared spectra,ultraviolet spectra,nuclear magnetic resonance(1HNMR) spectra,and fluorescence spectra were used to investigate the complexes,Experiments have proved that the complexes of Eu^3 and Tb^3 with aromatic hydroxamic acids have good fluorescent characteristics.     

烷基羟肟酸对细粒锡石的浮选及其溶液化学性质(英文)

采用烷基羟肟酸作为捕收剂对细粒锡石进行浮选,并对其溶液化学性质进行研究。结果表明,3种烷基羟肟酸在碱性条件下对细粒锡石有较好的捕收能力,且适宜的浮选pH随着捕收剂碳链的加长而升高。金属离子对锡石浮选的影响主要由矿浆pH决定,金属离子浓度对锡石浮选也有影响。计算基团电负性得出烷基羟肟酸作为锡石捕收剂的适合烷基碳链长度大约为7。由溶液的组分浓度对数分布图(lgc—pH)分析可知,捕收剂以分子-离子共吸附模式作用于矿物表面。动电位测试及红外光谱分析表明,吸附反应中涉及到电荷作用力、氢键力和络合作用力,其最终产物可以表示为锡石的O,O-五元环结构的螯合物。     

咖啡酸、阿魏酸:新的非肽类内皮素拮抗剂1

目的 评价桂皮酸类化合物咖啡酸和阿魏酸对内皮素(ET-1)生物效应的拮抗作用并初步探讨其拮抗ET-1 的作用机理。方法 用咖啡酸与阿魏酸腹腔注射及静脉注射给药后观察其对ET-1 致小鼠急性死亡以及对大鼠升压效应、对离体主动脉条的收缩效应的拮抗作用;口服给药后考察其对醋酸去氧皮质酮(DOCA)-盐高血压大鼠ET-1 的作用, 并对DOCA-盐高血压动物模型ET-1 血浆浓度、血压和动物体重变化及心血管组织增生的影响;对ET-1、c-fos、热休克蛋白(HSP70)mRNA 基因表达的影响。结果 咖啡酸和阿魏酸腹腔注射给药后能显著延长ET-1 致小鼠急性死亡时间, 与对照组相比该作用具剂量依赖性;静脉注射给药后能拮抗ET-1 引起的正常大鼠升压效应;在离体器官上可观察到咖啡酸与阿魏酸能拮抗ET-1 的缩血管效应;咖啡酸和阿魏酸长期口服给药能降低DOCA-盐高血压模型大鼠的血压、对心脏和血管的组织增生有明显的抑制作用;可降低血浆中ET-1 的浓度并可减少ET-1 引起的c-fos、HSP70 mRNA 基因表达的增加;放射性受体-配体结合实验表明, 咖啡酸和阿魏酸可竞争性地抑制ET-1 与其受体结合。结论 咖啡酸和阿魏酸为新的非肽类ET-1 拮抗剂。     

Synthesis and characterization of a new poly(aryl ether ketone) containing zinc phthalocyanine

A novel poly(aryl ether ketone) (PAEK) copolymer with metallophthalocyanine units was synthesized by the reaction of PAEK containing dicyanophenyl with excess amounts of 1,2-dicyanobenzene and zinc chloride in quinoline. This copolymer exhibits high glass transition temperatures and excellent thermal stability. This copolymer shows strong optical absorption in the visible region, and exhibits strong blue photoluminescence. Furthermore, this polymer can form differently aggregated structures in chloroform with the addition of 4,4′-bipyridine (Bipy). In particular, when polymer was mixed with 4 equiv. of Bipy, a uniform cotton like superstructure was observed. These results indicated that the axial coordination of zinc phthalocyanine and Bipy plays an important role in controlling the polymer morphologies obtained by the addition of Bipy to solutions of the polymer in CHCl₃.     

Electrodeposition of tin, copper and tin-copper alloys from a methanesulfonic acid electrolyte containing a perfluorinated cationic surfactant

Tin, copper and tin-copper alloys were electrodeposited from a methanesulfonic acid electrolyte containing a perfluorinated cationic surfactant at 296 K. The electrolyte composition was 0.02 to 0.05 mol dm^− 3 SnSO₄, 0.02 to 0.2 mol dm^− 3 CuSO₄, 12.5 to 15% vol MSA (1.9 to 2.3 mol dm^− 3 CH₃SO₃H, pH < 1), 0.01 mol dm^− 3 hydroquinone and 0.008 to 0.012% vol perfluorinated cationic surfactant. Electrodeposition was studied at a rotating disc electrode (RDE), a rotating cylinder electrode (RCE) and a rotating cylinder Hull (RCH) cell. Cyclic voltammetry and linear sweep voltammetry were used to investigate the current-potential relationships at static and rotating disc electrodes. Tin-copper alloys were deposited over a wide range of operating conditions to produce surface finishes from dark-grey (3 to 9 wt.% Cu), light-brown (50 to 60 wt.% Cu) and golden-yellow (70 to 80 wt.% Cu). The influences of copper(II) and surfactant concentration, applied current and surfactant adsorption were investigated; while the surface microstructure and composition of the deposits were studied.     

Synthesis,electrical properties and crystal structure of a new et-based charge-transfer salt containing binuclear polychloride complex anion

A new charge-transfer salt containing hexachlorodicuprate (II) binuclear polychloride complex counter anions, ET₂Cu₂Cl₆ (ET = BEDT-TTF = bis (ethylenedithio)-tetrathiafulvalene), was prepared. The room-temperature d.c. conductivity and relative resistance temperature dependence of the salt from room temperature down to 77 K along the longest crystal growth direction are reported. The crystal structure is determined by the X-ray diffraction method at room temperature. It belongs to the triclinicpl space group with crystallographic parameters of a = 11.379(4), b= 16.353(4), c = 9.054(4) A, α = 90.33(3), β= 100.69(3), γ= 100.06(2) °, V= 1628(1) A³, Z = 2, d_c = 2.261 g cm⁻³, λ (Mo Kα) = 0.710 69 A, μ = 28.45 cm⁻¹, F₀₀₀ = 1104.00 and final R = 0.043, R_w = 0.057 for 2331 observed reflections. The structure consists of isolated ET stacks and the binuclear polychloride complex dianion (Cu₂Cl₆)²⁻ sheets. In the donor stack, significantly short S···S contacts are observed.