含钒石墨尾矿提钒技术研究

金溪石墨矿矿石中钒含量较高,研究表明矿石经石墨浮选后钒绝大部分都进入尾矿中,因此从尾矿中回收钒成为开发金溪石墨矿必须解决的问题。为此,根据矿石中钒的特点,在借鉴石煤提钒技术的基础上,对浮选试验获得的金溪石墨尾矿进行了提钒试验。试验结果表明：采用加酸焙烧-水浸-除钾铝-萃取-反萃取-氧化沉钒工艺,可使金溪石墨矿浮选尾矿中钒的浸出率、萃取率、反萃取率和沉淀率分别达到95.5%、87.6%、99.9%和99.0%,同时可获得对浮选尾矿产率分别为9.2%和23.2%的钾明矾和铵明矾;此外,浸出渣主要由硅酸盐组成,并具有较高的活性,可以作为水泥掺合料和生产建筑材料的原料。     

高砷难处理金精矿焙烧-氰化浸出工艺研究

对甘肃某高砷高硫难处理金精矿进行了氧化焙烧预处理—氰化浸出试验研究,取得了砷、硫脱除率分别达92.63%、99.81%,金的浸出率达85.23%的较好技术指标,可为有效利用高砷微细浸染型金矿资源提供参考。     

含锑金矿回收方法研究现状

本文简要介绍了我国含锑金矿分布与资源特点,针对其回收存在难点与问题,评述了我国含锑金矿几种主要回收方法,包括浮选法、焙烧法、生物法、化学碱浸法、强化浸出法等,指出了各回收方法优缺点及适用范围,并提出了今后研究重点在于强化浸出及联合应用方面。     

铝土矿浮选尾矿制备聚合硫酸铝铁的研究

某铝土矿浮选尾矿在600 ℃下焙烧3 h后,按照硫酸溶液（浓度45%）与焙砂5∶1的液固比,在100 ℃下浸取3 h,铝、铁的浸出率分别达到61.65%和94.10%。浸出液中通过适量添加硫酸亚铁和双氧水,制备的聚合硫酸铝铁液态产品符合国家标准。不同水样的混凝试验结果表明,该产品对于浊度的降低和固体悬浮物的去除具有较好效果。     

Optimization of roasting conditions as an useful approach for increasing antioxidant activity of carob powder

Antioxidant activity, gastrointestinal solubility of polyphenols and formation of different classes of Maillard reaction products (MRPs) that occurs during thermal processing of carob powder was investigated in relation to different roasting time-roasting temperature combinations applied. Principal component analysis (PCA) was used to group carob powders with the aim of proposing optimal roasting conditions for obtaining the one with the highest biological activity that can be expected after undergoing the simulation of gastrointestinal digestion. Results showed that antioxidant activity of carob powder can be significantly increased by roasting due to improved polyphenol solubility and formation of the early-stage MRPs. Fluorescent MRPs, HMF and furfural, known for their toxic properties, were the most abundant in samples roasted under more severe time/temperature conditions. Carob powder roasted at 130 °C for 30 min yielded the highest antioxidant activity and the lowest toxic MRP formation.     

唐钢球团焙烧配加司家营矿的试验研究

根据唐钢的原料条件和生产工艺特点,在实验室研究了司家营矿配比量对球团矿造球过程和冶金性能的影响。结果表明:司家营矿以赤铁矿为主,含铁品位比较高,但成球性能较差,其配比不宜超过20%,当配比低于10%时,焙烧温度控制在1200℃左右比较合适,而当配加量为20%时,适宜的焙烧温度在1250℃左右。     

难处理金矿的球团包衣焙烧预氧化法研究

本文讨论了一种用于含硫砷碳难浸金矿的全新预处理方法—球团包衣焙烧氧化法。该过程的最大特点是在精矿和粘接剂形成的球团外侧覆盖一层由硫砷固定剂组成的包衣层。球团焙烧氧化产生的二氧化硫和三氧化二砷气体以硫酸钙和砷酸钙的形式被固定在包衣层中 ,没有二氧化硫和三氧化二砷扩散到大气 ,不需要烟气净化设施 ,不会产生环境污染。总结了反应的热力学数据。试验所得指标为 :硫固定率大于 99.98% ,砷固定率大于 99.99% ,焙砂产率 74 % (相对精矿 ) ,去衣金损失率 0 .6 3% ,焙砂金浸出率 91.71%～ 92 .84 % ,优于普通焙烧氧化法的 78.6 3%。     

油籽炒籽条件对油脂中多环芳烃含量影响的研究

以花生仁和芝麻籽为原料,研究了炒籽温度和炒籽时间对其油脂中16种多环芳烃含量的影响。结果表明,随着炒籽温度的提高及炒籽时间的延长,花生油和芝麻油中Bap、PAH4、PAH16的含量都呈明显上升趋势。对照GB2716及欧盟No 835/2011中对Bap、PAH4的限量规定,花生仁的合理炒籽温度为不超过160℃、炒籽时间不超过20 min,芝麻的合理炒籽温度为不超过180℃、炒籽时间不超过20 min。在优化的炒籽条件下,花生油中Bap、PAH4、PAH16含量(μg/kg)分别从原料中的0.31、4.60、16.69增加至1.07、11.98、48.86,芝麻油中Bap、PAH4、PAH16含量分别从原料中的0.63、5.23和21.84增加至0.93、8.28和47.95。     

青海某难选冶金矿提金工艺试验研究

青海某金矿为中硫、含砷和碳的微细粒难选冶金矿。在查明矿石物质组成的基础上，对矿石进行了选矿方法、工艺条件及流程方案试验研究，确定采用浮选—重选—精矿焙烧—氰化浸出提金工艺，获得了满意的技术经济指标。该成果已被建厂设计采用，建成投产后经济效益较好。     

Influence of processing conditions on the physicochemical and sensory properties of sesame milk: A novel nutritional beverage

Production of sesame milk is one of the methods for increasing consumption of sesame as an excellent nutritional resource. The aim of this study was to examine the effects of sodium bicarbonate concentration in soaking water (0, 0.5 and 1 g/100 mL NaHCO₃), roasting temperature (0 and 145 °C) and blanching time (0, 15 and 30 min) on physicochemical and sensory properties of sesame milk. Changes promoted by these processing conditions were also evaluated via color analysis and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The processing parameters mainly affected pH, total solids, protein, fat, ash, lipoxygenase activity, stability, specific gravity, viscosity, color features and sensory properties. Sensory evaluation revealed that overall acceptability was higher in all treatments than the control. SDS-PAGE analysis showed that 7S globulins decreased by roasting and soaking while 11S globulins of sesame milk proteins increased by roasting. The optimum processing conditions were found to be soaking in water containing 0.5 g/100 mL NaHCO₃, blanching for 15 min and without any roasting when desirability function method was applied.