硫酸烧渣氰化法提金前的氨水预处理

硫酸烧渣 (以下简称烧渣 )的综合利用 ,在国外已有专利技术 ,而国内对其综合利用的研究与开发还很不深入 ,目前仅以 2 0～ 30元 /Ｔ的价格卖给水泥厂烧制水泥 ,其有效价值未得到充分的利用。从烧渣中提取黄金是其综合利用的一项重要内容 ,在黄金的工业生产中以氰化法的工艺最为成熟 ,生产成本也最低。但烧渣中含有较高的Ｚｎ、Ｃｕ ,若不预先将其除去而直接进行氰化浸出 ,则每吨烧渣将消耗 1 5～ 1 8ｋｇＮａＣＮ。仅此一项 ,将会导致亏损。Ｃｕ的存在不仅增加ＮａＣＮ的消耗量 ,而且还会使Ａｕ的氰化浸率严重下降。国内在处理富含黄铜矿的…     

硫铁矿烧渣制备氧化铁黄和氧化铁红

对利用硫铁矿烧渣制备氧化铁黄和氧化铁红进行了研究。考察了影响硫铁矿烧渣还原、酸溶、中和、氧化等过程的各种因素。结果表明,在适宜的条件下,利用烧渣可以制备出用做颜料的氧化铁黄和氧化铁红。     

重铬酸钾容量法测定硫铁矿烧渣中铁的改进

硫铁矿烧渣是硫酸生产过程中的固体废弃物，其中铁含量在40％～60％。由于硫铁矿烧渣的量很大，其综合利用具有很高的实际意义，并已得到多方面的关注和研究。目前，硫铁矿烧渣除在冶炼、建材方面有所应用外，还作为铁系化工产品的原料。因此，烧渣中铁含量的测定是保证产品质量的关键。     

硫铁硫烧渣制备氧化铁黄和氧化铁红

对利用硫铁矿烧渣制备氧化铁黄和氧化铁红进行了研究。考察了影响硫铁矿烧渣还原、酸溶、中和、氧化等过程的各种因素。结果表明，在适宜的条件下，利用烧渣可以制备出用做颜料的氧化铁黄和氧化铁红。     

蛭石对高钠高钙准东煤结渣特性影响研究

采用一维沉降炉,辅以灰熔点仪的实验方法,将蛭石与高钠高钙准东煤掺混燃烧,研究其对高钠高钙准东煤结渣特性的影响。结果表明,随着蛭石掺烧量的提高,灰熔点温度呈现先降低后升高的趋势,当掺烧量为6%时灰熔点温度最低;蛭石掺烧量越高,高钠高钙准东煤结渣情况改善越明显,当掺烧量达到4%时,渣样变得疏松多孔,质地变脆,渣样与沉积探针之间的黏附性较弱,极易通过吹灰除去,建议蛭石掺烧量为4%;煤灰中原始矿物质以石英、钙铝黄长石或钙黄长石以及辉石类的低熔点矿物质为主,掺烧蛭石后,含钠的绿辉石矿物质被转化为韭闪石,含铁的斜辉石、赤铁矿等矿物质被转化为铁橄榄石,渣样中的矿物质均以高熔点的镁橄榄石为主;蛭石具有固钠的作用,取样温度越低,蛭石掺混量越高,其固钠效果越明显。     

硫铁矿渣中提取铁及其在纳米α-FeOOH制备中的应用

硫铁矿烧渣;碳酸盐法;硫铁矿渣中提取铁及其在纳米α-FeOOH制备中的应用     

落实核心素养的“铁及其化合物”复习项目式教学——硫铁矿烧渣的综合回收利用

以“硫铁矿烧渣的综合回收利用”为项目学习主题，以硫铁矿烧渣为原料制备绿矾晶体，并进行定性检测和定量组成测定为项目学习活动，呈现项目学习流程和项目实施过程。通过对真实问题的解决，培养学生的化学学科核心素养，促进深度学习。     

聚合硫酸铁的制备及在造纸废水处理中的应用

对用硫铁矿烧渣制备聚合硫酸铁进行了研究 ,考察了影响烧渣酸浸、水解聚合及稳定性的各种因素。中试结果表明 ,在试验条件下 ,可以得到比重为 1 .58g/mL ,浓度为 1 80 g/L的棕色粘稠高浓度和高稳定性的液体聚合硫酸铁产品。用其对造纸废水处理时 ,CODCr的去除率可达 80 %。     

固体聚合硫酸铁结构及其热变化

硫铁矿烧渣;热性能;固体聚合硫酸铁结构及其热变化     

硫化物中微量金的X射线能谱分析

介绍了一种用加热去硫来制备硫化物能谱试样的方法;将黄铁矿在400-500℃下加热3-10min制备成X射线能谱试样,可以保持试样的原始结构,提高硫化物中包体金的X射线能谱峰背比,了解矿物之间的共生关系;并对黄铁矿中微量的包体金作了X射线能谱半定量分析;该法简便、有效。     

Kinetics of formation of lead and zinc sulfides in sulfiding roasting in a superheated steam atmosphere

The kinetics of the formation of sulfides in reactions of oxidized lead and zinc compounds with pyrite in a superheated steam atmosphere was studied. The dependences of the rate on the roasting duration at various temperatures were found, the kinetic parameters and modes of sulfide formation were determined, and the mechanism of the process was suggested.     

南瓜籽烘烤前后化学成分的分析

对烘烤前后南瓜籽中的化学成分进行分析并对比。采用同时蒸馏萃取装置萃取南瓜籽中的挥发性成分,采取超临界CO2萃取技术萃取南瓜籽油脂,并将其分为酸、碱、中性三个部分,用气相色谱-质谱联用方法分析其中化学成分并进行对比。结果表明,南瓜籽挥发性成分中含有多种醛类和酯类化合物,烘烤后产生了大量的烷基吡嗪,其在碱性部分中的相对含量比烘烤前提高14倍多,不饱和醛类化合物含量也有明显提高。南瓜籽油脂中的主要化学成分是油酸、亚油酸及其酯类。还含有生物活性功能成分如植物甾醇、角鲨烯和维生素E等。烘烤后除角鲨烯含量有所降低,维生素E、植物甾醇、亚麻酸等均有提高。     

Atomabsorptionsspektrometrische Bestimmung von Indium in Schwefelkiesen, Abbr?nden und Zwischenprodukten der chlorierenden R?stung

Zusammenfassung Es wird über ein Verfahren zur Bestimmung von Indium in Schwefelkiesen, Abbränden und Produkten der chlorierenden Röstung mit Hilfe der atomaren Absorption berichtet. Indium wird durch Extraktion mit Diisopropyläther aus 6 N bromwasserstoffsaurer Probelösung abgetrennt. Nach Reextraktion mit 0,5 N Salzsäure wird der Indiumgehalt durch Extraktion aus 3 N bromwasserstoffsaurer Lösung in Methylisobutylketon überführt. Der Ketonextrakt wird direkt am Atomabsorptionsspektrometer gemessen. Der Variationskoeffizient betrug 32% bei 2 g/t bzw. 15% bei 10 g/t.

---

Determination of indium in pyrites, pyrite cinders, and intermediate products of chlorinating roasting by atomic-absorption spectrometry

Indium is separated from the 6 N hydrobromic acid sample solution by extraction with diisopropyl ether. After re-extraction with 0.5 N hydrochloric acid the indium content is transferred into methyl isobutyl ketone by extraction from 3 N hydrobromic acid solution. The ketone extract is directly measured in the atomic-absorption spectrometer. The standard deviation is 32% for 2 g/t and 15% for 10 g/t.

---

---

Herrn Prof. Dr. E. Asmus zum 60. Geburtstag gewidmet.     

An improved sequential extraction method to determine element mobility in pyrite-bearing siliciclastic rocks

A sequential extraction method was developed for pyrite-bearing (FeS₂) siliciclastic rocks. The focus of this study was to enhance the procedure by an improved oxidation step to completely dissolve not only organic matter but also microcrystalline pyrite. In the first experiment, four oxidation procedures were compared for pure pyrite at extraction temperatures of 25°C and 85°C with hydrogen peroxide (H₂O₂) as the main oxidant. It was found that pyrite dissolution was most effective by using a mixture of H₂O₂, ammonium acetate (NH₄OAc) and nitric acid (HNO₃) at 25°C. This procedure dissolved >90% pyrite, and detected >75% using solute iron measurements. The difference between these two results was explained by reprecipitation of secondary iron minerals. The procedure worked best at 25°C, since solvent evaporation at 85°C amplified iron oversaturation and precipitation. For the pyrite-bearing siliciclastic rocks, two sequential extraction schemes were compared to optimise solid–solvent ratio, extraction step order and type of solvent. Eventually, the most effective step order identified for siliciclastic rocks containing pyrite and little organic matter was to first (1) remove the exchangeable fraction, followed by (2) dissolution with acid and afterwards (3) with a reducing agent. The (4) oxidation step was performed last.     

Optimization of Pretreatment Procedures for Analysis of Polycyclic Aromatic Hydrocarbons in Charcoal-Grilled Pork

A method for analysis of 13 polycyclic aromatic hydrocarbons in charcoal-grilled pork was established by high performance liquid chromatography with ultraviolet detection. The cleanup and preconcentration steps include ultrasonic extraction, saponification, liquid-liquid extraction, and solid-phase extraction. Under the optimization experimental conditions, polycyclic aromatic hydrocarbons would be determined at trace level with recoveries between 68.5% and 102.8%. Additionally, the influence of grilling time on polycyclic aromatic hydrocarbons content was investigated. It was testified that when the roasting time reached 4 minutes under the experimental conditions, the content of carcinogen benzo(a)pyrene had exceeded the limit of the European Union.     

Extraction of nickel from nickel alloy by carbonylation

Carbonylation refining technology has been used to extract nickel from nickel alloy. Before carbonylation, roasting and size reduction is used as a pre-treatment method, and re-activation with H₂ is needed. During carbonylation, the addition of H₂S helps to activate the nickel surface and improve the extraction rate. The supply of H₂S does not necessarily need to be continuous. The optimum parameters for extraction of nickel are a carbonylation temperature of 70 °C, pressure of 10 bar, flow rate of 0.25–0.35 L/min and mixture of CO and H₂S as carbonylation agent. The best extraction rate of nickel can reach 99%.     

重金属在黄铁矿中的相态及其释放的分级提取和漫反射红外光谱分析

以分级提取-电感耦合等离子体质谱考察了黄铁矿中重金属的相态分布。结果表明,黄铁矿中的重金属以Pb为主,总量达830mg/kg,并且酸可交换态Pb主要存在于碳酸盐相中或直接以PbS形式存在,这部分Pb达56.9%;易还原态Pb主要存在于铁氧化物相中,为29.7%;可氧化态和残余态Pb存在于硫化物相和硅酸盐相中,分别为3.5%和9.9%。黄铁矿在自然条件下以Pb释放为主,Cr和Cd的释放也不容忽视。漫反射红外光谱表征发现,黄铁矿在表面氧化过程中,其表面羟基增强,表明存在表面溶解及表面酸化现象。进一步的机理探讨认为,重金属在黄铁矿表面存在一种“溶解-吸附”平衡,这一平衡由黄铁矿表面氧化和碳酸盐中和作用共同控制,并决定重金属的释放及迁移。     

Bioleaching of low grade uranium ore containing pyrite using A. ferrooxidans and A. thiooxidans

A process of uranium extraction from ore containing 3.1 % pyrite by bacterial leaching was investigated in shaken flasks during 90 days. The highest uranium recovery amounting to 85.1 % was obtained using binary mixture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans that was exceeding results obtained by traditional acid leaching technique up to 27 %. High uranium recovery was founded to be due to the high degree of pyrite dissolution that can be readily achieved by bacterial leaching (up to 98.0 %).     

黄金冶炼厂中萃取法提铜

研究了羟肟类萃取剂对铜及主要杂质铁的萃取行为，并进行了串级流动试验，考察了铜、铁的分离效果，确定了不影响黄金收率的最佳铜、铁萃取分离流程。     

Identification of pyrite using 57Fe Mössbauer spectroscopy in core sediments from Erhai Lake, SW China combined with a series of acidic pre-treatments

Summary A method has been developed for analyzing pyrite quantitatively in the sediments of Erhai Lake in southwest China using ⁵⁷Fe M?ssbauer spectroscopy combined with a series of acidic pre-treatments. Following a washing with an alkaline solution (0.1N NaOH), the sediment samples were successively treated using HCl, HF, and then HCl (65 °C). The residues thus prepared were analyzed for pyrite using ⁵⁷Fe M?ssbauer spectrometry. The presence of pyrite was also confirmed in the acidic residues of the sediments using sulfur K-edge X-ray absorption near edge structure. This method can be used to measure pyrite in aquatic sediments, especially when the concentration of pyrite is very low and the particles of pyrite are small or the crystallinity is low, and even in amorphous status. In addition, vertical variations of pyrite contents are positively correlated with organic matter and negatively correlated with hematite, superfine paramagnetic ferric iron and sedimentation rate in the cored sediment from the Erhai Lake. All these geochemical indicators may also reflect environmental changes in sedimentation conditions and diagenesis.