卡林型金矿碳质物特征及其去碳方法研究现状

卡林型金矿为一种含碳含砷微细浸染型金矿。金矿中的碳物质由无机碳和有机碳组成,除碳酸盐矿物外,无机碳多为元素碳,而有机碳则主要由腐植物和烃类物质组成。研究结果表明,碳质物在氰化提金过程中会产生劫金效应,造成金浸出率下降。重点阐述卡林型金矿中碳质物特征及其劫金机理,对金矿中碳质物的去碳方法进行归纳与总结,分析现有方法的原理、特点和优缺点,并提出卡林型金矿研究的方向。     

碳质金矿中碳质物及其“劫金”机理研究进展

碳质金矿是重要的难处理金矿资源之一,碳质物“劫金”是金浸出率低下的主要原因。碳质物组分复杂,不同组分的碳质物的“劫金”能力和“劫金”行为存在差异,磨矿和浸出环节对碳质物的“劫金”能力也会产生影响,这些因素均能直接影响金的浸出率。通过系统总结碳质金矿中碳质物在组成特征、“劫金”机理及“劫金”能力的影响因素等方面的研究进展,对碳质物“劫金”机理现有研究工作的不足及未来研究方向进行了探讨,为碳质金矿碳质物劫金机理及预处理工艺的研究提供了重要参考。     

提高碳质脉石铜矿选矿指标试验研究

云南易门矿务局下属狮子山铜矿含碳质脉石,部分铜矿物被碳质形成膜所包裹,使得选矿生产指标一直较低,铜的回收率只在70%-78%。本次试验室试验研究,采用SS和CH调整剂对矿浆电位和选别条件进行调整,破坏包裹铜矿物的碳质膜,大幅度地提高了铜的选矿指标,与现有生产流程相比,铜的回收率提高了12.19%,可以产生很好的经济效益。     

碳质金矿石预处理方法

矿冶界将碳质金矿石定义为含有机碳的难浸矿石 ,该类矿石难浸的原因是由于有机碳与金氰络合物发生作用而严重影响了氰化提金效果。碳质金矿石中的碳主要有 3种形式 :元素碳、大分子烃类化合物、腐植酸类。后两者统称为有机碳。一般认为 ,原生矿中的有机碳高于 0 .2 %就会严重干扰氰化提金。　　在美国和前苏联都发现了大型的碳质金矿床 ,在我国已发现的一些大中型金矿如 :镇远、东北寨和戈塘等有机碳含量也都较高。因此 ,如何既经济又有效地处理碳质金矿石颇为国内外黄金工业界所关注。从技术上划分 ,可将碳质金矿的预处理方法分为 2类 :除…     

抑制和促进的CIL：碳质金矿高收率氰化冶炼工艺研究

研究氧化型碳质金矿的氰化行为及其中碳质物对金的吸附能力，探讨某些有机化合物对碳质物和活性炭吸附能力的抑制或促进。结果表明，某些芳烃衍生物可使碳质物的吸金量和吸附速度降低７５％，某些胺类化合物能提高活性炭的吸金能力，两者以适当方式加入矿浆可以使金的收率从８３．３％提高到９５．６％。     

抑制和促进的CIL－碳质金矿高收率氰化冶炼工艺研究

研究氧化型碳质金矿的氰化行为及其中碳质物对金的吸附能力，探讨某些有机化合物对碳质物和活性炭吸附能力的抑制或促进。结果表明，某些芳烃衍生物可使碳质物的吸金量和吸附速度降低７５％，某些胺类化合物能提高活性炭的吸金能力，两者以适当方式加入矿浆可以使金的收率从８３．３％提高到９５．６％。     

碳质金矿中碳质物的物质组成及其与金的相互作用

本文利用广西风山县金牙金矿对碳质金矿中的碳质物进行了研究。探索出从矿石中有效分离各种碳质组分的方法。在碳质物中发现如下的三种物质：（１）活性炭类物质（２）腐殖酸（３）长链酯或长链酯与长链烷烃的混合物。进一步的实验结果表明：产生“劫金”作用的碳质物主要为活性炭类物质,腐殖酸次之,酯或烃类似乎与劫金效应无关。但总的来讲,金牙金矿中碳质物的劫金作用较弱,金滩浸的主要原因不是碳质物对金的吸附,而强能是金的     

难浸碳质金矿中金的浸出研究

研究了氨性硫代硫酸盐体系中,碳质金矿中金的浸出行为,考察了硫代硫酸钠和氨水浓度,硫酸铜、硫酸铵用量对金浸出率的影响。结果证明:含碳质金矿中的金可被硫代硫酸盐溶液有效浸出。金的浸出率从氰化法的21. 22 %提高到90 %以上。实验证实活性炭不能有效吸附浸出液中的Au(S₂O₃)₃^-2络离子,这一独特性能可能使氨性硫代硫酸盐浸金体系成为碳质金矿中金的最有前途的回收方法。     

煤过程中渣,碳,煤,气相互作用下高炉内残碳的消耗

高炉内未燃碳的积聚是限制最高喷煤比的一个因素。未燃碳与、铁和气相互作用能对碳的吸收产生很大影响，该项工作了含渣的低级铁氧化物与含不同灰分（０．０５％～１２．２５％）的碳质的相互作用。在充满１５００℃高温氩气的管式炉内进行这些试验，并在现场研究渣、碳、煤气之间的相互作用。试验结果表明：碳质的不同灰含量及尬发影响了它们被渣浸润程度，如果浸润性好，可以极大地减少熔化初期的接触角。具有好的浸润性的碳料可与     

CO还原烧结矿过程中的析碳行为

高炉中CO 还原烧结矿过程中会发生析碳反应,对高炉操作产生不利的影响。采用 CS-8800型高频红外碳硫分析仪分析CO 还原烧结矿过程中的析碳行为,并采用 Nova400NanoSEM型场发射扫描电子显微镜分析还原后烧结矿微观结构。研究结果表明：随着温度的升高,析碳反应 CO 的平衡浓度越高,反应越难发生。在低温下析出的碳较多,析出的碳主要分布在烧结矿表面和气孔中,而在温度较高时只有微量碳析出;体系中 CO2对析碳反应有明显的抑制作用;析碳量随着还原时间的增加而增加。     

Leaching of copper and zinc from oxidised ores by fungi

Various types of fungi have been isolated from Indian mine water samples and the leaching of oxidised copper and lead—zinc ores by these species investigated. Metal dissolution characteristics with respect to one specific type of fungi, viz. Aspergillus niger, are illustrated. The effects of pH, pulp density and carbon source on the fungal activity are also reported.     

乙二酸对电感耦合等离子体质谱的增强效应(英文)

研究了不同浓度下乙二酸对元素电感耦合等离子体质谱(ICP-MS)行为的影响。结果表明,低浓度乙二酸对所分析元素的灵敏度具有显著的增敏效应,尤其是对电离电位在9~11eV的Be,Zn,Se,As,Sb,Hg等高电离电位元素。作为一种增敏剂,乙二酸可以补偿由于无机基体的存在对高电离电位元素所产生的信号抑制现象,从而提高其分析灵敏度2~10倍。采用所建立的方法测定了水标准物质中的Be,Zn,Se,As,Sb和Hg,其测定结果与标准物质的认定值基本一致。     

Microbiological leaching of copper from lead mattes

The possibility of recovering copper from lead blast furnace mattes by bioleaching, using bacteria of the genus Thiobacillus ferrooxidans, has been studied. In this paper, the influence of certain variables on the dissolution rate and the adaptation period of the bacteria have been evaluated, including energy source, nutrient, type of matte, type of stirring, pulp density, and particle size. In addition, the influence of bioleaching for different periods of time, as a preparatory stage before chemical or biological leaching of the matte, was studied. The optimum conditions for recovery are achieved by way of the two-stage bioleaching process. The degradation of the solid caused by bacterial activity during the first stage is the reason for the high recovery during the second stage.     

Characteristic of synergistic extraction of oxalic acid with system from rare earth metallurgical wastewater

Large amount of high concentration acidic wastewater would be produced in the conversion process of chloride rare earth into oxide rare earth.It was a mixed solution of oxalic acid and hydrochloric acid,so the recycling use was very difficult.The method of liquid-liquid extraction was proposed in this paper to achieve wastewater treatment and reclamation.The mechanism of extraction of oxalic acid from the wastewater with the systems of 50% TOB+45% kerosene and 5% 2-ethyl hexanol was investigated.The composition and structure of the extracted species and the establishment of the mathematical model of the oxalic acid extraction were determined by the use of saturation method,equimolar series method.The results showed that extraction of oxalic acid by TOB was a neutral association extraction,oxalic acid existed mainly in a molecular form in the organic phase,and the extraction combination ratio was 2:1.The duality extraction system composed of extractant TOB and TOC had synergistic extraction effect on oxalic acid and chlorhydric acid,and the extraction dislribution ratio was improved greatly.The optimum volume fiaction of TOB was 0.6-0.8.     

Copper recovery from chalcopyrite concentrates by the BRISA process

The technical viability of the BRISA process (Biolixiviación Rápida Indirecta con Separación de Acciones: Fast Indirect Bioleaching with Actions Separation) for the copper recovery from chalcopyrite concentrates has been proved. Two copper concentrates (with a copper content of 8.9 and 9.9 wt.%) with chalcopyrite as the dominant copper mineral have been leached with ferric sulphate at 12 g/L of ferric iron and pH 1.25 in agitated reactors using silver as a catalyst. Effects of temperature, amount of catalyst and catalyst addition time have been investigated. Small amounts of catalyst (from 0.5 to 2 mg Ag/g concentrate) were required to achieve high copper extractions (>95%) from concentrates at 70 °C and 8–10 h leaching. Liquors generated in the chemical leaching were biooxidized for ferrous iron oxidation and ferric regeneration with a mixed culture of ferrooxidant bacteria. No inhibition effect inherent in the liquor composition was detected. The silver added as a catalyst remained in the solid residue, and it was never detected in solution. The recovery of silver may be achieved by leaching the leach residue in an acid-brine medium with 200 g/L of NaCl and either hydrochloric or sulphuric acid, provided that elemental sulphur has been previously removed by steam hot filtration. The effect of variables such as temperature, NaCl concentration, type of acid and acidity–pulp density relationship on the silver extraction from an elemental sulphur-free residue has been examined. It is possible to obtain total recovery of the silver added as a catalyst plus 75% of the silver originally present in concentrate B (44 mg/kg) by leaching a leach residue with a 200 g/L NaCl–0.5 M H₂SO₄ medium at 90 °C and 10 wt.% of pulp density in two stages of 2 h each. The incorporation of silver catalysis to the BRISA process allows a technology based on bioleaching capable of processing chalcopyrite concentrates with rapid kinetics.     

Effect of mucin and glucose on proteolytic and glycosidic activities of Streptococcus oralis

The production of glycosidase and protease activities, which may play a role in the degradation of human glycoproteins, by Streptococcus oralis strains isolated from endocarditis, septicaemia or the oral cavity was investigated with a range of fluorogenic substrates. The pH optima of the proteases ranged from 6.0 to 9.3 and the pH optima for the glycosidases were lower (4.5-6.0), although the pH range over which both groups of enzymes acted was broad. Growth in a minimal medium supplemented with glucose resulted in repression of glycosidase activities and elevated proteolytic activity. Bacteria from cultures supplemented with porcine gastric mucin (PGM), a model glycoprotein, exhibited higher levels of glycosidase activity, while proteolytic activity was suppressed and glycoprotein-derived monosaccharides were transported at significantly higher rates than those observed for cells grown in media with glucose. PGM-derived cells also exhibited high levels of N-acetylneuraminate pyruvate-lyase, the first intracellular enzyme in the pathway of sialic acid catabolism. Taken together, these data indicate that S. oralis strains produce a range of proteolytic and glycosidic enzymes that may play a role in the degradation of host-derived glycoproteins.     

Intracellular localization of arginase in chick kidney

Although chickens are uricotelic and do not have significant urea-ornithine cycle in any tissue, the kidneys contain a high concentration of arginase which apparently functions to regulate degradation of dietary arginine. A series of investigations has been made to determine the intracellular localization of this arginase in chicken kidney. Tissue fractionation using sucrose density gradients and differential centrifugation showed as association of arginase activity with certain marker enzymes and with fractions identified as mitochondria by electron microscopy. This is consistent with the localization of the arginase in the mitochondrial matrix of chicken kidney cells. Such a finding has significance in understanding the regulation of arginine degradation in chickens.