硫酸烧渣制备永磁锶铁氧体预烧料的工艺研究

文章介绍了硫酸烧渣提纯的技术和工艺,探讨了提纯后的原料做锶铁氧体预烧料的主要影响因素,使预烧料生产的锶永磁铁氧体磁性能稳定达到Br：400mT,Hcb：270kA／m,Hcj：280kA／m,（BH）m：32kJ／m^3以上。     

热压氧化浸出有价金属过程中硫的物相分析

文中利用不同价态硫的化学性质不同,采用不同的化学试剂分别定量地直接测定出TS（总硫）、S^6＋（硫酸盐中的硫）、S^0（单质硫）、间接测定出S^2-（硫化物中的硫）,并结合热压浸出的实际情况进行测定,取得了较好的效果,对热压浸出提取有价金属试验具有重大的指导意义。     

Experimental investigation of high-temperature corrosion properties in simulated reducing-sulphidizing atmospheres of the waterwall fireside in the boiler

The presence of reducing atmospheres of the waterwall fireside in the boiler due to extensive use of low-NOx combustion mode caused severe high-temperature corrosion problems. In this study, high-temperature sulphur corrosion properties of two types of low alloyed waterwall steel (15CrMoG and 12Cr1MoVG) in two kinds of reducing-sulphidizing atmospheres were investigated by lab-scale experiments. The experimental atmospheres and temperature were simulated according to field measurements in the boiler of a thermal power plant. The experimental results showed that the reducing-sulphidizing atmosphere with CO was more corrosive, and the CO accelerated the corrosion of H₂S and worsened the corrosion. The CO inhibited the formation of oxide scales, provided some corrosion resistance, and produced the intensely corrosive COS. The corrosivity of the alkali metal chlorides was limited in the reducing-sulphidizing atmosphere without CO, while the corrosion was strongly hindered in the reducing-sulphidizing atmosphere with CO.     

Calcium sulphide formation in fluidized bed boilers

Analyses of samples of bed ash from a stationary fluidized bed boiler show the presence of calcium sulphide. In some samples, half of the total sulphur was present as sulphide. The samples containing CaS were obtained under unstaged conditions and with a high excess air ratio, 1.3 to 1.4. The samples were taken after a stop in the limestone addition, i.e. at high SO₂ emissions of about 1000 mL/m³ (ppm). No CaS was found during limestone addition when the SO₂ emission was 300–400 mL/m³. This indicates that formation of large amounts of CaS may be initiated as the SO₂ concentration exceeds some critical level.     

Development of laboratory tests to predict the lubricity properties of diesel fuels and their application to the development of highly refined diesel fuels

In the last few years there has been an increasing requirement for the provision of environmentally benign diesel fuels. However, the introduction of such fuels into service has been associated with high levels of field failure of rotary distribution fuel pumps due to wear. This is because the refining processes necessary to produce ecologically acceptable fuels result in greatly reduced levels of sulphur compounds, aromatics, and polar material, many of which are potential lubricity agents. This paper describes the development of bench test methods to evaluate diesel fuel lubricity and thus enable the identification of appropriate ‘solutions’. It has been found that the key to obtaining good correlation between field experience and bench tests is (1) to reproduce the thermal conditions present in operating pump contacts and (2) to ensure that the same mechanisms of wear operate in the bench test as in the pump environment. The physical and chemical processes involved in the lubrication of fuel pumps and the influence of temperature on these processes are outlined. As a result of the work described in this paper, effective additive solutions have been discovered for controlling the failure of diesel fuel pumps in the field and a provisional ISO (ISO/TC 22 / SC 7 M595: ‘Diesel engines - diesel fuel - performance requirement and test method for assessing fuel lubricity’) and CEC test method for assessing diesel fuel lubricity has also been developed.     

2019年中国硫磺市场数据统计与分析

介绍了2019年中国硫磺产量、进口量及市场数据。2019年中国硫磺产量约7440 kt,同比增长9.4%;进口硫磺量11730 kt,同比增长8.8%。2019年中国进口日本、韩国液体硫磺量为2039.9 kt,与2018年基本持平。2019年中国硫磺市场一路走低,年度降幅为50%,在此过程中相关数据屡次刷出新的记录。2019年全国港口库存硫磺均值数达到1890 kt,数据最高点达到2750 kt。2020年中国硫磺国产数量继续有增长预期,而进口数量或许要看港口库存消耗及下游的整体表现,综合来看,2020年的硫磺市场背负的压力并不比前几年小。     

干熄焦锅炉炉管失效机理分析

通过对干熄焦锅炉炉管及腐蚀产物开展系统研究,提出炉管失效原因为氧化/硫腐蚀＋高温粉尘冲刷。长寿命炉管仅耐磨层发生了较为严重的氧化及硫腐蚀,而近基体层发生了轻微氧化及硫腐蚀,基体只发生了轻微氧化;短寿命炉管耐磨层、近基体层以及基体裂纹内均发生了较为严重的氧化及硫腐蚀,且存在珠光体球化、内表面产生全脱碳层等缺陷。推测短寿命炉管存在超温现象,而超温可加剧氧化及硫腐蚀反应。此外,短寿命炉管遭受了较为严重的高温粉尘冲刷,不仅可造成炉管减薄,还会导致炉管表面温度升高。因此,减少循环气体中粉尘量尤其是大颗粒,可有效减弱冲刷以及控制炉管表面温度,是提高炉管使用寿命的关键。     

大蒜脱臭方法及其系列保健产品开发和利用

对大蒜（ＡｌｉｕｍＳａｔｉｖｕｍＬ．）采用加热、添加剂处理及加入矫味剂等方法进行了脱臭实验，利用定硫法测定了大蒜脱臭前后的蒜素含量，比较了不同脱臭方法的效果，并对大蒜脱臭系列保健产品的开发应用进行了初步研究。     

含有机硫配体的三元钨杂多化合物的制备及表征

研究了缺位取代的三元钨杂多化合物配位水被有机硫配体取代的杂多化合物的制备 .用二步合成法首次制备了 2种晶体 .[(C4H9) 4 N] 4H2 SiW11O39CuS(CH3) 2 和 [(C4H9) 4 N] 4H2 SiW11O39ZnS(CH3) 2 .通过电子光谱、拉曼和红外光谱、核磁共振谱、热分析等对其进行了表征 .     

氢氧化钡废渣的综合利用

复分解法生产氢氧化钡过程中产生的硫，锌废渣有很高的回收利用价值，采用负压（真空）操作，液碱吸收，盐酸法联产氯化锌、硫氢钠和沉淀硫酸钡，使氢氧化钡废渣得到了很好的利用，这种联产方式工艺简单，技术先进，生产安全，经济效益较好。