复混肥料中硼含量的测定

采用电位滴定法测定复混肥料中硼的含量，该法较分光光度计法简便、快速、准确度和精密度较高，便于推广应用。     

多晶硅无定型硅粉形成原因及控制

改良西门子法多晶硅生产过程中,若还原过程控制不当,会产生影响产品品质及系统运行的无定型硅粉。通过对还原过程温度控制、物料配比、二氯二氢硅含量、炉筒水温、尾气管结硅及换热情况等多方面因素研究,分析了无定型硅粉形成原因,提出了相关控制措施。     

熔盐电解法制备元素硼粉

介绍了熔盐电解法制备元素硼粉的方法,讨论并比较了各体系的长处与不足.     

硼含量对改性酚醛树脂性能的影响

以硼酸作为高羟甲基低游离酚PF(酚醛树脂)的改性剂,制备相应的BPF(硼改性酚醛树脂)及其模塑料。采用红外光谱(FT-IR)法对BPF的结构进行了表征,并对其凝胶化时间、固化工艺条件、热性能和模塑料的性能等进行了探讨。研究结果表明:当w(B)=9%时,BPF及其模塑料的综合性能相对最好,其固化工艺为160℃/20 min,后处理工艺为"140℃/1 h→160℃/1 h→180℃/2 h";与纯PF模塑料相比,BPF模塑料的马丁耐热温度(196℃)提高了42℃、弯曲强度(111.8 MPa)提高了21.9 MPa且冲击强度(18.50 kJ/m2)也有所提高。     

液体复混肥中硼含量测定的探讨

硼是农作物生长发育所必需的营养素之一 ,由于需要量很小 ,在作物体内的含量仅占作物体干重的 0 .0 0 5% ,故又划属作物必需营养的微量元素之一。液体复混肥中硼的制备也正是基于此点 ,但配制时 ,相对呈高浓度状态 ,其量约≥ 2 .5g/ L ,使用时需成百倍稀释 ,以便植物吸收。由于液体复混肥是新近开发的肥料产品 ,对含硼肥料中硼的检测 ,尚未见到标准。通常对于硼的检测方法 ,按其含量适应范围的不同 ,主要有酸碱容量法和比色法两类。两种方法都有一定的干扰物存在 ,但容量法较简单快速 ,比色法相对显得繁琐。从液体复混肥中硼的含量范围考虑…     

三氟化硼三乙醇胺中硼的测定

三氟化硼三乙醇胺中的氟和ＴＥＡ干扰硼的测定。用蒸馏法将硼从样品中分离出来，然后用甘露醇法进行测定。操作简便，测得结果满意。     

电解法制备硼粉过程电流效率的影响因素

电流效率是电解法制备单质硼的一个重要生产指标,它涉及到硼电解槽的产量和电耗。在电解槽型的设计过程中,如何提高熔盐电解的电流效率对于硼粉的单位时间产量、降低单位电耗等主要技术经济指标具有重要的意义。文中采用氟化钾-氯化钾-氟硼酸钾体系,进行了实验研究。在电解槽内测定了制备过程中电流效率随电解温度、电流密度、电极间距离、电解时间的变化关系。结果表明:当电解温度为760—790℃、电流密度在0.8—1.14 A/cm2、电解时间为2.5—3 h、极间距离为4 cm时,电解的电流效率最高。     

无定型高吸水性树脂的制备

综述了聚丙烯酸钠型无定型高吸水性树脂的结构,性能,制备工艺、国内外研制的进展,以及对我国吸水树脂消费市场的展望。     

姜黄素光电比色法—测定肥料中硼的含量

硼是以微量加入肥料的,而肥料中主要成份N、P_2O_5、K_2O及其它成份SiO_2、CuO、ZnO、CaO、F_2O_3、Al_2O_3、MgO、MnO、P、CO_2等含量较大,所以确立一种简单、快速、准确的硼分析方法是必要的。硼的分析方法有很多种,目前主要分     

Preparation of Nanostructured Hexagonal Boron Nitride Powder

In this communication, we describe an inexpensive and feasible method for the preparation of hexagonal boron nitride (h–BN) nanorods in the absence of metal catalyst. Tertiary calcium phosphate (Ca₃(PO₄)₂) and ammonium biborate hydrate (NH₄HB₄O₇·3H₂O) were selected as starting materials where calcium phosphate was used as a diluting agent to prevent the formation of bulk B₂O₃ during the thermolysis of ammonium biborate hydrate. The mixture was nitrided at 900°C in the flowing ammonia and was transformed into h–BN nanorods after subsequent crystallization. After crystallization at 1650°C for 2 h, the unique microstructure of h–BN nanorods was observed.     

青藏硼资源的开发利用

概述了该厂利用青藏含硼资源做原料加工生产硼砂和硼酸的历程。     

庆祝中国硼工业建立45周年

以亲身经历从选矿、生产工艺等几方面回顾了我国硼工业创建发展的45年历史,并对今后发展进行了展望。     

Synthesis of Amorphous Boron Nitride by Pressure Pyrolysis of Borazine

Amorphous BN that contains hydrogen could be synthesized by pressure pyrolysis of borazine below 700°C at 100 MPa. The fraction of B and N bonded to H in the pyrolysis product could be controlled by changing the pressure pyrolysis condition. The pyrolysis product at 700°C and 100 MPa showed formation of B-N-B bonds of the hexagonal structure in the amorphous state with some B-H and N-H bonding remaining. Spherulitic BN could be prepared only by pyrolysis below 400°C and 100 MPa. The yield of amorphous BN from borazine was as high as about 60% by this pressure pyrolysis. Amorphous BN formed from borazine could be readily converted to cubic BN by reacting it with AIN at 1200°C and 6.5 GPa.     

ICP－AES 法测定硼铸铁中的硼

采用电感耦合等离子体原子发射光谱法（ ICP－AES ）探讨硼铸铁中硼的测定。以盐硝混酸（3＋1＋6）和硫酸溶液（1＋3）在低温下溶解样品,溶解完毕后定容,在设定的仪器工作条件下测定。硼检出限为0．027 mg／L。用该方法可测定硼铸铁中0．0034％～0．38％硼含量,连续测定6个平行样测定结果的相对标准偏差均小于4．52％,其回收率在93％～108％、相对误差在3．03％以内。     

Application of Amorphous Boron Granulated With Hydroxyl‐ Terminated Polybutadiene in Fuel‐Rich Solid Propellant

Amorphous boron powder granulated with HTPB, whose particle diameter could be controlled, was prepared by mechanical mill method. It was found that amorphous boron powder could be granulated with HTPB binder to form B‐HTPB particles, whose median particle diameter (d₅₀) and specific surface area are in the range of 125.0–431.0 µm and 0.02–0.1 m² g⁻¹, respectively. The B‐HTPB particles could be dispersed in the HTPB binder with relatively low viscosity compared with direct addition of amorphous boron powder to the HTPB binder. The experimental results showed that the content of boron particles in a fuel‐rich propellant could be increased by addition of B‐HTPB particles and the combustion characteristics of the fuel‐rich solid propellant could be improved.     

甘露醇碘滴定法测定叶面肥中的硼

甘露醇碘滴定法测定叶面肥中硼的含量,适用于硼含量高于1%原料及成品的分析,方法操作简便,不需要仪器设备,终点明显,具有较好的精密度及回收率.     

Removal of boric acid,monoborate and boron complexes with polyols by reverse osmosis membranes

The effects of reverse osmosis (RO) membrane type on the rejection efficiency of boric acid, monoborate and boron complexes with d-mannitol, sodium d-gluconate and N-methyl d-glucamine was revealed. The membranes examined included: XLE, TW-30, BW-30 and SW-30, supplied by DOW™ FILMTEC™. The mass transport coefficients: permeability and reflection coefficient were determined for each species in boric acid–polyol aqueous system. The influence of the membrane type upon these coefficients was evaluated and quantitative, comparative analysis of the efficacy of boron rejection at varying permeate flux, the feedwater boron content, the alcohol/boron molar ratio and the pH was conducted. It was found that boron rejection in the above systems was determined by the extent of boric acid transport, even when boric acid constituted only a minor component of the feedwater. At high permeate flux the effectiveness in boric acid rejection decreased in the following descending membrane order: SW-30 > BW-30 > TW-30 > XLE. The results presented here enable the selection of the best membrane, the most suitable operating conditions for boron separation by RO in the presence or absence of polyols, and for quantitative prediction of the efficiency of boron removal with various RO membranes.     

耐高温漆酚有机硼树脂的合成与结构表征

本文以漆酚与甲醛的缩合反应,产物漆酚缩甲醛中间体为基本骨架,在其分子结构中引入无机硼元素,生成键能较高的B-O键。所制得的漆酚有机硼合成产物具有比漆酚缩甲醛树脂更高的抗氧化能力、耐热性稳定性及瞬时耐高温性能,漆膜附着力、柔顺性、硬度和耐冲击强度等力学性能也有明显提高。     

含腐植酸类微肥中硼的测定

研究了Na2O2 KClO3对腐值酸的脱色处理,用姜黄素比色法测定微量硼,取得了满意效果。