H2O2 的分解过程影响因素及其稳定剂

对 H2 O2 的分解过程影响因素进行了研究 ,对 H2 O2 的稳定剂进行了比较 ,SH— 2 2非硅型氧漂稳定剂效果最好 ,使 H2 O2 8小时分解率为 1 .89% ,漂白白度为 83%左右     

石墨炉原子吸收光谱测定微量钴

研究了石墨炉原子吸收测定微量钴，钴吸收线的特性，各种酸对钴原子化的影响以及Ｍｇ（ＮＯ３）２的基体改进效应，提出了以Ｎａ２ＳｉＯ３为稳定剂，用石墨炉原子吸收人发中痕量钴的方法。     

废彩印纸不同脱墨技术的研究

在高浓度条件下,浆料被直接挤入快速加热器,在10～20秒内快速升温到80～90℃,同时加入0.5%H<,2>O<,2>、1%NaOH、3%Na<,2>SiO<,2>、使化学药剂与浆料充分混合.用搅拌机摩擦揉搓,此时再加入设计浓度为1%、2%、3%的漂白剂H2O2进行漂白.漂白时间为2～3h,用造纸气浮澄清水将浆料稀释至3.5%左右的浓度,从塔低输出,再加硫酸中和,调pH为7.0左右.最后将干燥的再生纸进行白度、色度、回收率分析.     

蔗渣浆全无氯漂白的研究

本本文探讨了在Op段低NaOH用量,P段低H2O2用量的条件下采用OpQP流程将蔗渣浆漂至82%ISO的可行性,并讨论了非硅过氧化氢漂白稳定剂代替硅酸钠用于过氧化氢漂白的可行性。研究表明非硅过氧化氢稳定剂PP-2,PP-1耐高温、高压,可用于压力过氧化氢漂白。在Op段2%NaOH,0.5%H2O2;P段3% H2O2,PP-1 0.1%, PP-2 0.5%条件下,蔗渣浆采用OpQPo流程,漂后浆白度达到85%ISO。OpQPo从根本上消除了AOX的产生,经测定漂白废水属于可生物降解废水,只有Q和P段的部分废水进入废水处理系统, 容易通过常规的污水处理方法达到日益严格的国家排放标准。     

环多胺型仿酶金属配合物的制备与应用

合成了1,4,7-三甲基三氮杂环壬烷(Me3tacn),以Me3tacn为原料与CoⅡCl2·6H2O反应,制备[Co2ⅡCl3(Me3tacn)2]·[CoⅡCl3(H2O)3]环多胺型仿酶金属配合物催化剂,采用傅里叶变换红外光谱和元素分析的方法对合成的金属配合物进行表征.将这种仿酶金属配合物应用于棉织物的温堆漂白工艺试验,探讨了温度、配合物浓度及稳定剂质量浓度3种因素对双氧水漂白棉织物效果的影响.研究结果表明,在80℃条件下,环多胺金属配合物浓度为12μmol/L,稳定剂XT-A质量浓度为1g/L时,漂白棉织物的白度为78.1%,且强力损失小.与传统漂白工艺相比较,应用环多胺金属配合物催化双氧水漂白棉织物工艺在一定程度上实现了低温低碱漂白.     

废报纸脱墨浆H_2O_2漂前预处理

研究了Na2SO3与DTPA联合用于废报纸脱墨浆H2O2漂前预处理的效果,并与尿素、DTPA、硫酸、EDTA预处理剂的预处理效果进行了比较。结果表明,Na2SO3与DTPA联合是种优良的预处理剂,与其他预处理剂相比,可使漂后浆白度提高1.4%～4.2%ISO。     

H2O2稳定剂的研究进展

概述了H2O2漂白稳定剂的稳定机理，详尽地归纳了近20年来所报道的稳定剂类型，分为以吸附屏蔽为主，结合或螯合为主，吸附与络合相结合、多成分复配及其他。     

ANALYSIS ON COMPOSITION OF FOULANTS FROM ALKALINE WHEAT STRAW BLACK LIQUOR AND DISCUSSION ON ITS FOR MING MECHANISM

1.INTRODUCTIONWheat straw is the main raw material in northern China, and its black liquor is blamed for contributing serious pollution to the environment. A technical breakthrough has been achieved in the field of chemical recovery for wheat straw pulping after more than twenty years' developments and practices. Wheat straw pulp chemical recovery projects with the pulping capacity of 75-100t/d have been put into 132--production gradually in recent years. Evaporation of wheat straw pulp…     

H4SiW6Mo6O40／SiO2在H2O2催化氧化环己酮合成己二酸中的应用

采用溶胶一凝胶法制备了二氧化硅负载硅钨钼酸催化剂．以二氧化硅负载硅钨钼酸（H4SiW6M06040／SiO2）为催化剂,30％H202为氧源,催化氧化环己酮合成己二酸．探讨H4SiW6Mo6O40／SiO2对氧化反应的催化活性,较系统地研究了二氧化硅负载硅钨钼酸用量、反应温度、H。02用量、反应时间等因素对产物收率的影响．实验表明：H4SiW6Mo6O40／SiO2是合成己二酸的良好催化剂;在n（环日酮）：n（H2O2）：n（H4SiW6Mo6O40／SiO2）=100：198：0．124,反应温度为110℃,反应时间3．5h的最佳条件下,己二酸的收率可达86．7％．     

Electrochemical behavior of gold and its associated minerals in alkaline thiourea solutions

Electrochemical measurements were conducted to study the electrochemical behavior of gold (Au) and its commonly associated minerals in alkaline thiourea solutions. The results indicated that without addition of any stabilizer, selective dissolution of Au from stibnite and pyrite was only possible at relatively low thiourea concentrations. As Na₂SiO₃ was added, pyrite started to become active and an oxidation peak appeared; the oxidation peaks of arsenopyrite and chalcocite appeared earlier than that of Au. The chalcocite peak shifted in the positive direction and the peak current increased. Stibnite did not show an oxidation peak and its current was nearly zero. Adding Na₂SiO₃ favored the selective dissolution of Au when its minerals were associated with chalcocite and stibnite. At pH 12, the Au anode dissolution peak current increased with stabilizer concentration. At 0.38 and 0.42 V and for Na₂SiO₃ concentration below 0.09 M, the current density continuously increased with Na₂SiO₃ concentration. The Na₂SiO₃ concentration had to be adequate to stabilize thiourea. When the potential was higher than 0.42 V, the surface of the Au electrode started to passivate. With an additional increase in potential, the presence of Na₂SiO₃ could not stop the inevitable decomposition of thiourea.     

过氧化氢的氨基酸包合物的制备与稳定性研究

目的制备H2O2的氨基酸包合物固体,应用于水产养殖中的营养剂和增氧剂。方法采用共沉淀法,H2O2在NaCl存在下可以与Na2SO4形成稳定的加合物,利用该性质,用H2O2来包合氨基酸,进而形成H2O2和氨基酸的包合物。结果通过实验确定的最佳优选工艺为:30%H2O2溶液与Na2SO4的投料比(V/m)为50mL∶64g,加复合氨基酸20mL,制备温度为15℃;加入8g NaCl和0.16g复合稳定剂;100℃干燥30min;制得包含物中含有H2O210%,氨基酸含量为0.45%。结论上述方法制得的H2O2-氨基酸包含物适宜于作为水产养殖使用的营养剂和增氧剂,而且具有便于储藏,使用方便之特点。     

利用循环流化床飞灰合成分子筛实验研究

利用循环流化床锅炉粉煤灰在n(SiO2)/n(Al2O3)≈3.3、Na2O/SiO2为1.2～L 5、H2O/Na2O为40～70、凝胶温度和时间分别为60-70℃、时间2 h、晶化反应温度在90-95℃,晶化时间为4-6 h的条件下可以合成出较高结晶度的分子筛,通过XRD表征发现,产品具有良好的P型分子筛特征峰,其相对结晶度为53%.热重分析可知其具有好的稳定性.     

MODIFIED OPAL:A NOVEL STABILIZER FOR HYDROGEN PEROXIDE BLEACHING OF PULPS

The possibility of modified opal as the stabilizer of hydrogen peroxide bleaching was investigated. The results showed that the modified opal in place of sodium silicate as the stabilizer of hydrogen peroxide bleaching is feasible. At the same dosage, above 3% ISO can be increased for both wheat straw pulp and deinked pulp. The stabilizing ability of the modified opal to hydrogen peroxide bleaching of pulp is improved markedly. It is favorable for bleaching to increase temperature and time within a permissive extent. The suitable process conditions are 10% of pulp consistency, 3% of hydrogen peroxide, 1.5% of sodium hydroxide, 3% of the modified opal, 70℃ and 60 min when the modified opal is used as the stabilizer of hydrogen peroxide bleaching. At these conditions, the brightness gain can reach about 16% ISO for wheat straw pulp. In addition, it is favorable for bleaching to add a little magnesium sulfate when the modified opal is used as the stabilizer of hydrogen peroxide bleaching, the brightness of pulp can increase I%ISO if0.05% of magnesium sulfate is added. The cost analysis indicated that the modified opal is superior to sodium silicate as the stabilizer of hydrogen peroxide bleaching in economical aspect and has further the potential of market development.     

THE STUDY ON TCF BLEACHING OF NS REED PULP

In this paper, we have researched TCF bleaching on reed pulp including oxygen delignification, oxygen delignification with H2O2 intensification and H2O2 bleaching. The results show that Op-P bleaching process on NS reed pulp is suitable and the brightness of bleached pulp is up to 82% ISO.     

添加剂对AZ31B镁合金氧化膜性能的影响

在由NaOH、H3BO3、Na2B4O10组成的电解液中,研究了不同添加剂Na2SiO3和NaAlO2对AZ31B镁合金阳极氧化膜性能的影响.通过电压-时间曲线、Cass盐雾试验、SEM和动电位极化曲线等方法检测和观察阳极氧化膜性能和表面形貌.结果表明:两种阳极氧化膜表面均为多孔结构,电解液中添加Na2SiO3获得的氧化膜表面微孔分布均匀,孔径更小;与AZ31镁合金基体相比,其耐蚀性均有不同程度的提高,Na2SiO3添加后膜层的耐蚀性优于NaAlO2.     

马尾松化学预热机械浆镁碱过氧化氢漂白

研究了用镁碱代替钠碱的马尾松化学预热机械浆（CTMP）浆过氧化氢漂白工艺及其对纸浆性能的影响,分析了镁碱和钠碱过氧化氢漂白废液对环境的影响.试验结果表明,马尾松CTMP浆镁碱漂白过氧化氢的最佳漂白工艺条件为：H2O2体积浓度为4%,Mg（OH）2质量浓度为1.2%,Na2SiO3质量浓度为1.5%、漂白温度为80℃、漂白时间为120 min,其白度可至63.5%（ISO）,而经钠碱漂白后纸浆的白度值为61.4%（ISO）.镁碱过氧化氢漂白废液化学耗氧量（CODcr）为193.6 g/L,比钠碱过氧化氢漂白废液化学耗氧量（CODcr=312.86 g/L）降低了38.12%.     

过氧化氢漂白磨石磨木浆的工艺研究

本文简述了过氧化氢漂白的作用机理，通过实验室小试，找出过氧化氢漂白磨石磨木浆的影响因素及最佳漂白条件，为抄制白度65％以上的胶印书刊纸提供依据。     

CaO-SiO_2-Na_2O-CaF_2-Al_2O_3-MgO渣系的粘度和结晶温度

采用CaOSiO2Na2OCaF2Al2O3MgO渣系,用差热分析仪测定熔渣的结晶温度,用粘度测定仪测定熔渣的粘度,研究结晶温度和粘度与碱度、w(Na2CO3)、w(CaF2)、w(Al2O3)和w(MgO)之间的关系,并得到相应的回归方程·利用这两个回归方程,可以预测连铸保护渣的结晶性能和粘性特征·化学成分通过改变粘度,来影响晶核形成速度和晶体成长速度,从而决定了熔渣的结晶性能·结晶温度随着粘度的减小而升高·渣系中只有MgO可以在减小粘度的同时降低结晶温度     

二氧化硅负载磷钨钼酸催化合成苹果酯-B

采用溶胶-凝胶法制备了多相催化剂H3PW6Mo6O40/SiO2,并通过FT-IR、XRD对其进行了表征。探讨了该催化剂对合成苹果酯-B的催化活性,较系统地研究了酯醇物质的量比、催化剂用量、带水剂用量、反应时间等因素对产品收率的影响。研究发现:H3PW6Mo6O40/SiO2是合成苹果酯-B的良好催化剂,在n(乙酰乙酸乙酯)∶n(1,2-丙二醇)=1∶1.3,催化剂用量为反应物总质量的1.0%,带水剂环己烷用量为12 mL,反应时间45 min的适宜条件下,苹果酯-B的收率为71.4%.     

冀北崇礼红旗营子黑云斜长片麻岩的地质地球化学特征

基于当代红旗营子群是否应该解体这一观点,研究了崇礼红旗营子群中黑云斜长片麻岩的地质地球化学特征。研究表明原岩为泥质沉积岩,其特点为SiO2〉56％,Al2O3〉MgO,Na2O〉K2O,Na2O／（Na2O＋K2O）〉0．5,且其他氧化物与SiO2含量呈现出有规律的变化,随着岩石中SiO：含量的增加,TiO2,AL2O3,FeO,Fe2O3,MgO,CaO,Na2O和K2O呈明显下降趋势。稀土元素总量较低;轻重稀土分离程度较高,LREE／HREE的值为5．16～7．98,La。／Yb。的值为4．28～8．62,轻稀土富集,重稀土平坦分布,稀土配分曲线表现出中等程度的负Eu异常,δEu的值为0．73～0．83。稀土元素Ce基本无异常或略显负异常,表明其形成环境可能为一浅海相或边缘海或被陆地封闭海。