单─银精矿提取银的技术

某单─银矿经浮选所得精矿（％）：Ａｇｌ～２，Ｃｕ≈１，Ｐｂ４～７，ＣａＯ＋ＭｇＯ３０～３５，Ｓ４～７，Ｃ８～９。研究了氰化、硫脲、氨浸等方案对该精矿浸出效果，并从浸出指标等因素进行比较，认为焙烧─预浸─氨浸方案较好，银浸出率＞９７％，铜浸出率９５％。     

废弃稀土抛光粉回收再利用研究进展

这是一篇冶金工程领域的论文。以稀土抛光粉废料为原料,通过正交实验设计,首先进行废料与硫酸铵和硫酸氢铵混合物的焙烧实验,使稀土氧化物转化为硫酸盐。实验考查3个因素,每个因素取3个水平,选用正交表L₉(3⁴),安排了9个实验,统计分析实验结果：焙烧温度取480 ℃,焙烧时间取3 h,质量比取1.8∶1。然后在酸浸液中加入0.2%的硫脲作还原剂,研究用稀硫酸从焙烧固相中浸出稀土的工艺条件。实验考查4个因素,每个因素取4个水平,选用正交表L₁₆(4⁵),安排了16个实验,统计分析实验结果：酸浸温度取90 ℃,硫酸浓度取0.5 mol/L,浸出时间取4 h,稀硫酸与焙烧固相的液固比（质量）取4:1,稀土的浸出率可达97.8%～98.0%。     

含碳微细粒难处理复杂金矿选矿试验研究

针对某含碳超显微包裹体难浸金矿石,分别开展了常规氰化浸出探索试验、优先浮碳再细磨浮金探索试验、细磨焙烧预处理再氰化提金探索试验。试验结果表明,采用常规氰化时金的浸出率仅为14.01%,即使进行脱碳处理后,金浮选的回收率也仅达到51.82%。该类型矿石若要解决受含碳和包裹金影响的问题,有效的途径之一就是进行焙烧预处理。矿石经细磨后,采用“焙烧-水洗-碱浸-氰化”的工艺流程,金的浸出率可达87.57%,从而使金得到了较好的回收。     

Antioxidant Properties of Cocoa Beans (Theobroma cacao L.): Influence of Cultivar and Roasting Conditions

Effects of various roasting conditions on antioxidant properties of five Theobroma cacao L. varieties were investigated. The cocoa beans were roasted at four different temperatures (110–150°C) and three different air humidities (0.3–5.0%). The raw cocoa beans were characterized by high antioxidant activities. The antioxidant properties of the roasted cocoa beans varied markedly among the analyzed cultivars and geographical regions and were affected by roasting conditions. Generally, cocoa beans of the cv. Forastero from Brazil exhibited higher total phenolic content, free radical scavenging activity, and metal chelating ability than samples of the other analyzed cocoa varieties. Roasting at 110°C caused negligible changes in total phenolics content and antioxidant activity of cocoa beans, while almost all samples tended to have lower antioxidant potential when roasting temperature increased. The air humidity used in roasting did not affect the total phenolics content and antioxidant activity for lowest roasting temperature (110°C). Moreover, the obtained results revealed that thermal processing at the higher temperatures and elevated air humidity resulted in the higher antioxidant capacities. It was also found that the ferrous ion chelating activity of cocoa beans increased with the roasting temperature (in the range from 110 to 150°C), with the exception of cv. Trinitario from Papua New Guinea. The data showed that roasting at lower temperatures with humid air are more favorable in terms of preserving the bioactivity of roasted cocoa beans.     

Thermodynamic analysis of the carbothermic reduction roasting of a nickeliferous limonitic laterite ore

As the sulfide ore deposits become less economically viable as a source of nickel, increasing attention is being paid to the nickeliferous laterite ores. However, in contrast to the sulfide ores, these oxide ores cannot be as easily concentrated by current technologies. Consequently, considerable research effort is being directed at developing new techniques for beneficiating the nickeliferous laterites. The pyrometallurgical production of a high-grade ferronickel alloy using a low cost carbonaceous reductant at relatively low temperatures is particularly attractive. In the current research, a thermodynamic model has been developed to aid in the understanding of the carbothermic reduction roasting process as a potential upgrading method for the nickeliferous limonitic laterite ores. The effects of process parameters such as temperature and reductant to ore ratio on the grade of the ferronickel alloy produced and the nickel recovery in the alloy have been studied. The thermodynamic predictions are shown to be in general agreement with the experimental results currently available in the literature.     

Formation of Benzo(a)pyrene in Sesame Seeds During the Roasting Process for Production of Sesame Seed Oil

The main aim of this research was to enhance the understanding of the formation mechanisms of benzo(a)pyrene (BaP) during roasting of sesame seeds (SS). BaP levels in hot‐ and cold‐pressed sesame seed oil (SSO) were evaluated to correlate oil technology and BaP formation. Extracted principal components from SS were roasted either singly or in mixtures at 230 °C for 30 min. BaP was measured by HPLC with fluorescence detection. The results showed that BaP levels in hot‐pressed SSO were significantly higher than those in cold‐pressed SSO (p < 0.05), BaP formation mostly occurred during SS roasting and increased with roasting temperature (between 80 and 280 °C) and time (from 10 to 50 min). Furthermore, the BaP level in the roasted hulled SS (3.64 μg/kg) was higher than it was in roasted whole SS (1.63 μg/kg). The maximum BaP level observed (5.03 μg/kg) was detected in a roasted mixture of SS protein and SSO. The addition of sesame protein to protein‐free SSO promoted the formation of BaP, which suggests that the pyrolysis products of protein and triacylglycerols are probably important precursors in BaP formation.     

碘化浸金试验研究

碘化浸金是一种新的非氰化浸金方法。文章详细介绍了不适合浮选处理的含碳原生金矿焙烧试验和碘化浸出时各影响因素试验。分析了各种实验现象，通过试验得出了合理的焙烧温度为650℃、碘化浸出率可提高15％左右，浸出速度快等结论。     

普格高铁高碳煤系硬质高岭土矿选矿加工技术研究

阐述了影响煤系硬质高岭土矿用于造纸涂料的主要因素和解决途径，并以四川普格高岭土矿加工利用研究为例，论述了该矿的矿石性质、加工工艺及其特点。通过研究最终获得了高档级涂布原料、中档级涂布原料和造纸填料三种产品，并进行了产品应用试验和技术经济分析。     

陕西某金矿浸渣提金方法研究

本文主要针对陕西某黄金冶炼厂的焙烧氰化尾渣为试验物料,进行了工艺流程及条件试验研究。试验结果表明：该焙烧氰化尾渣经高温焙烧——氰化浸出的提金工艺流程,可得到金和银的浸出率分别为66.26%和90.26%,为该地区焙烧氰化尾渣资源的开发提供了坚实的技术支撑。