以废料硫化钡制备高浓度硫化钠溶液工艺研究

本文研究了以废料硫化钡为原料采用硫酸钡副盐法制备高浓度硫化钠溶液工艺的过程特性,考察了90℃水中硫化钡的溶解时间、溶解效率、硫酸钠与硫化钡反应时间等因素对硫化钠和硫酸钡产率的影响。用能谱和XRD分析了制备的硫酸钡纯度,结果显示,硫酸钡的纯度大于98%,达工业硫酸钡合格产品;经过浓缩,溶液中硫化钠浓度可达12%～15%。试验结果对产品生产工艺设计与改进具有指导意义。     

脱硫催化剂活性测定方法的改进

目前测定脱硫催化剂活性的方法是沿用早期的,该方法需用重铬酸钾溶液标定硫代硫酸钠溶液,用硫代硫酸钠溶液标定碘液,最后用碘液来标定硫化钠溶液,试剂的配制和标定很繁琐,而且一些仪器设备现在不易购置.本文介绍一种改进的脱硫催化剂活性测定方法.采用该方法,可以减轻中小企业在资金、人员方面的困难,能够满足中小企业在催化剂活性测定方面的需要.     

循环水中总磷测定方法的改进

根据钼酸铵分光光度法对循环水中的总磷进行分析时,发现溶液显色不明显,测定结果偏低。改进后,测定结果显著提高;同时,进行加标试验,测定回收率,验证了改进方法的准确性。     

化学试剂氯化钡中重金属含量测定方法的改进

主要讨论用硫化钠-丙三醇溶液代替饱和硫化氢水溶液测定化学试剂氯化钡中重金属(以铅计)含量的方法.此方法简单、易操作、污染小,且与原方法测定结果一致,回收率100%.     

亚甲蓝法测定天然气中硫化氢含量优化研究

实验室依据GB/T 11060.2-2008建立实验方法,在标准色阶配制过程中发现,国标规定的用硫化钠制备标准比色溶液的方法不完善,是测量结果不确定度的主要来源。通过改进实验方案,优化实验条件,建立了亚甲蓝法测定天然气中硫化氢的实验方法,提高了测定结果的准确性和安全性。     

多硫化钠的制取

多硫化钠在湿法冶金、橡胶、皮革工业以及在农业上都有广泛的应用,也是硫化染料的重要原料。目前,多硫化钠大多数厂家都是自产自用,质量难以保证。并且对它的生产和研究很少报导。 本文将介绍硫在氢氧化钠溶液中生成多硫化钠的反应机理,动力学的实验测定,中间试验和工业生产多硫化钠溶液的工艺流程,这对于指导生产有着很大意义。     

硫化钠-丙三醇分析法测定饲料级磷酸氢钙中重金属含量

浅议用硫化钠-丙三醇溶液分析法测定饲料级磷酸氢钙中重金属(以铅计)含量，该方法快速、准确、简便，测量结果与国标分析法测量结果相符，能及时为生产提供分析数据。     

用电位滴定快速分析硫化钠

一、前言本方法的试验,是为了改革过去沿用的硫化钠化学分析方法。过去测定硫化钠及其杂质碘氧化物,长期沿用碘氧化后回滴法,由于分析手续繁,所耗时间长,而且会引起较大误差。本方法参考文献所提出用电     

还原剂抗坏血酸溶液配制方法的改进

硅钼蓝分光光度法测定水中的二氧化硅含量所使用的还原剂抗坏血酸溶液很不稳定,有效期仅为一周。通过改进配制方法,在配制抗坏血酸溶液时,加入适量EDTA和冰乙酸,试验测定结果的试验灵敏度、线性关系及准确度均符合硅钼蓝分光光度法的技术要求。改进后的抗坏血酸溶液贮存于棕色瓶中,可以稳定90d。     

用一六○五废渣制成沉淀硫磺粉

用1605农药生产过程中产生的废硫磺渣可以制得沉淀硫磺粉,其方法如下。一、方法原理1.将硫磺溶解于热的硫化钠溶液中,形成多硫化钠溶液。2.将多硫化钠溶液经过滤除去不溶性杂质,再与硫酸作用可得到颗粒很细的沉淀硫磺     

硫化钠-元素硫法脱硫技术在西北地区应用探讨

分析了我国西北地区二氧化硫烟气处理现状,提出一种适合该地区的烟气脱硫技术——硫化钠一元素硫法。该方法利用硫化钠溶液作为吸收液吸收二氧化硫,生成元素硫和硫酸钠,元素硫作为产品回收,硫酸钠由还原气还原为硫化钠后循环使用。介绍了该方法的工艺原理、优点和适用条件,对其工业化实施进行了可行性分析。以西北地区某冶炼厂烟气和某钢铁厂烧结烟气条件为例进行了模拟设计和经济评估。由于以便于储运的元素硫为产品,该技术适合于我国偏远的西北地区特定条件下的二氧化硫烟气脱硫。     

栲胶脱硫液中悬浮硫含量测定方法的改进探讨

通过对栲胶脱硫液中悬浮硫分析方法的探索与研究，并对原分析方法进行改进，得出了快速测定悬浮硫含量的最佳试验方法。经实际应用，改进后的分析方法弥补了重量法和碘量法耗时长的缺陷，可满足生产控制分析要求。     

蒸馏-中和滴定法测定废水中氨氮含量的改进

对蒸馏-中和滴定法测定废水中氨氮含量的分析方法进行了研究。用磷酸盐缓冲溶液代替轻质氧化镁调节水样呈微碱性,以硫酸代替硼酸作为吸收液,以氢氧化钠标准溶液代替硫酸标准溶液滴定,经过实际样品和标准样品的测定,并与国标法进行了试验比对,证明改进后的方法对于高氨氮含量废水测定具有精密度好、准确度高的特点。     

反应沉淀法制备超细硫酸钡的研究

以精制硫化钡溶液和硫酸钠溶液为原料，在调速泵内采用液－液相反沉淀法合成超细颗粒硫酸钡液体，其条件为：硫化钡溶液质量浓度为15％，硫酸钠溶液质量浓度为26％，加入DTPA螯合剂，化合泵转速为2500r/min，得到平均粒径小于100nm的超细硫酸钡产品。     

调节pH抑制亚硝酸盐对碘量法测定溶解氧干扰的抑制作用

为进一步提高碘量法测定溶解氧(DO)对亚硝酸盐存在的上限,提出在滴定前调节溶液pH在4～5,以抑制亚硝酸盐的干扰。实验表明此法适用于亚硝酸盐质量浓度在5～300 mg/L的水样溶解氧测定,在较高浓度亚硝酸盐存在的条件下,此法对DO质量浓度在2～10 mg/L的水样均具有较高的准确度。     

Electrochemical noise analysis of corrosion of pure aluminium in alkaline solution in the presence of SO4 ion, NO3 ion and Na2S additives

The electrochemical noises obtained from pure aluminium in an alkaline solution have been analysed as a function of sulphate, nitrate or sodium sulphide concentration. A stochastic theory has been applied to the experimentally obtained electrochemical noises based upon the Weibull distribution function. From the occurrence of two linear regions on one Weibull probability plot, the present analysis method permitted us to distinguish between the dissolution of Al and the stochastic process concerning the series of nucleation, growth and detachment of hydrogen bubbles in an engineering sense. Moreover, the conditional event generation rate and the average charge in each event were quantitatively determined for the stochastic process of hydrogen bubbles as well as the dissolution of Al. Effects of sulphate, nitrate and sodium sulphide additives on the corrosion of pure aluminium in an alkaline solution have been discussed in terms of the conditional event generation rate and the average charge in each event.     

Using ecological reducing agents instead of sodium sulphide in dyeing with CI Sulphur Black 1

Although low‐cost sodium sulphide is used as a reducing agent in most sulphur dyeing processes, it is considered to be environmentally unfavourable because of the resultant contaminated wastewater and the toxic hydrogen sulphide generated during the dyeing process. In the present paper, hydrazine sulphate, glucose, and sodium borohydride in the presence of sodium hydroxide were used as ecologically safe reduction systems for the CI Sulphur Black 1 dyeing of cotton fabric, and results were compared with those obtained using sodium sulphide. Dyeing processes were carried out at 90 °C for 60 min, and the colour yield (the K/S value), dyeing fastness, and breaking strength of dyed fabrics after soaping were measured. Response surface methodology was employed for experimental design and optimisation of results. Mathematical model equations were derived and statistical analysis carried out by computer simulation programming using Minitab v.15. At a dosage of 0.8 g l^?1 of CI Sulphur Black 1, the optimum sodium borohydride reduction system (sodium borohydride 0.47 g l^?1, sodium hydroxide 0.65 g l^?1) exhibited the highest colour yield and the lowest chemical oxygen demand of the residual dyebath.     

油田污水腐蚀影响因素研究

为研究各种因素对油田污水腐蚀的影响,采用室内静态挂片失重法试验了A3碳钢在不同H2S、CO2、溶解氧、SRB浓度及不同pH值和矿化度的模拟油田水中的腐蚀行为。结果表明,碳钢的腐蚀速率随H2S、CO2、溶解氧、SRB浓度的增加而增大,溶解氧会促进H2S和CO2的腐蚀,H2S会抑制CO2的腐蚀;碳钢的腐蚀速率随矿化度的增加先增大后减小,在矿化度为40 000 mg/L时达到最大;碳钢在碱性环境下的腐蚀速率比酸性环境下的腐蚀速率小的多。     

The inhibiting effect of 3-methyl 1,2,4-triazole 5-thione on corrosion of copper in 3% NaCl in presence of sulphide

The effect of sulphide addition to the corrosion of copper in 3% NaCl was studied. The concentration of sulphide was remained rather low, up to 10 ppm. The effect of sulphide to copper corrosion is controversial in the literature and worth to verify by means of various experimental techniques. The polarization curves, plotted from a potential close to the open circuit one to negative or to positive direction indicated a decrease of corrosion current density, explained in the literature by the protective effect of CuS. In contrast, a quartz crystal microbalance, with electro-deposited copper indicated the increase of corrosion rate with increasing sulphide ion concentration. The EIS measurements showed also an acceleration of corrosion rate by addition of sulphide ions in sodium chloride solution. It is concluded that the presence of sulphide ions in the seawater accelerates the corrosion of copper. To protect the copper structure from the corrosion in presence of sulphide as pollutants, the anticorrosion effect of a new molecule, 3-methyl 1,2,4-triazole 5-thione was examined. The action of this molecule results in the reduction of the both anodic and cathodic current density, and its inhibiting efficiency reached a value of 90% at the concentration of 10 mM.     

含溴废液中溴离子测定方法的研究

文章对含溴废液中溴离子含量的测定方法次氯酸钠-碘量法进行了探讨,采用平行测定,加标回收等方法,考察了该方法的实用性。试验结果表明,采用次氯酸钠-碘量法对含溴废液加标回收率为98.1%~101.7%,符合容量法回收率在95%~105%的要求,可用于含溴废液中溴离子浓度的测定。