硫脲法浸金研究

硫脲法浸金是近年来引人注目且比较活跃的研究课题。本文研究了硫脲浓度、氧化剂用量、浸取温度和浸取时间对金的浸出率的影响,探求了硫脲法浸金的适宜条件。     

工业废渣中金属银的回收

研究了硫脲浸出———电解沉积法从含银高砷废渣中回收金属银的工艺方法 ,包括浸取液配方的筛选、最佳浸取工艺条件的确定以及浸取废液的循环利用 .结果表明 ,利用本项工艺 ,银的浸出率为 91 .33% ,电解回收率为97.2 3% ,总回收率为 88.80 % (均为质量分数 ) .为含银废渣的回收利用以及由此造成的二次污染的防治 ,提供了一套有效的方法     

用硫酸氧化预处理从难处理金矿中提金的无害化工艺研究

探讨了硫酸作为氧化剂分解含砷难处理金矿的技术可行性,实验结果表明硫酸可以有效地氧化砷黄铁矿而实现金的单体解离,适宜的分解条件为：硫酸与矿粉重量比为３,采用机械搅拌,反应温度２４０～２６０℃,分解时间２～３ｈ,分解渣采用硫脲浸出时浸金率高于９５％浸金条件为：硫脲浓度１％,三价铁作氧化剂,氧化剂与络合剂比值为０．０４～０．０６,浸出时间６ｈ图１,表６,参８     

溴─硫氰酸盐体系浸取硫化矿中的金

用溴—疏氰酸盐体系浸取金矿中的金是一种新的非氰化浸金方法。实验表明，对于含金量为２４ｇ／Ｔ的江西某硫化矿，经５５０℃～８００℃焙烧后，在常温下，在ＳＣＮ－浓度０．２０ｍｏｌ／Ｌ，Ｂｒ２浓度００３ｍｏｌ／Ｌ的条件下，４小时可以浸出＞９０％的金。该方法环境污染程度小，操作简单稳定，药剂成本较低，有重要的工业应用推广价值。     

土壤中不同形态铁的浸取条件研究

运用 Tessler 的连续提取程序,分别对土壤中不同形态铁的浸取温度、时间及浸取剂的浓度进行了试验.在最佳条件下,用火焰原子吸收法对浸取液中痕量铁进行了测定和加标回收试验,从而确定了土壤中不同形态铁的最佳浸取条件.     

酸枣浸取工艺研究

本文研究了酸枣的间歇浸取、半连续逆流浸取、连续逆流浸取工艺，提出了最佳浸取条件。在浸取温度为５５℃，水枣比为３．８时，连续逆流浸取工艺浸取率达到９２％，浸汁浓度为１４°Ｂｒｉｘ。并用浸取能力值对这三种工艺进行了评价。     

不同溶剂浸取红豆杉细胞中的紫杉醇的研究

用７种单一溶剂浸取红豆杉细胞中的紫杉醇,研究表明,甲醇有最好的浸取效果,紫杉醇含量占细胞干重的０．０３３１５％,在２３种混合溶剂中,ＣＨ３ＣＯＯＣ３Ｈ５／Ｃ２Ｈ５ＯＨ,ＣＨ３ＣＯＣＨ３／ＣＨ３ＯＨ,ＣＨ３ＣＯＣＨ３／Ｃ２Ｈ５ＯＨ,ＣＨ３ＯＨ／ＣＨＣｌ３浸取效果最好,其紫杉醇含量占细胞干重分别为０．０５１６６％,０．０４９２３％,０．０４２７６％,０．０３９８１％。     

红茶连续逆流浸取工艺研究

针对间歇法提取红茶的效率低、浓度低、利用率差的问题,采用L型螺旋式连续浸取器对红茶连续逆流浸取工艺进行了实验研究,根据对实验结果分析,在浸汁浓度、浸取率和浸取效率(浸取能力值F.E.A)等方面进行分析比较,并与两浸法浸取工艺相对比,得到了最优的浸取条件。浸取温度为85～95℃,浸取时间为33min,水茶比为8.2时,浸汁浓度为0.046kg/L,浸取率为78.4％,F.E.A为0.99g/L·min。     

钢铁冶金烧结除尘灰中铅的浸取回收和一氧化铅的制备

研究一种以钢铁冶金烧结机头电除尘灰为原料,湿法浸取回收其中的氯化铅并利用其制取一氧化铅的工艺技术。采用HCl-NaCl混合溶液将烧结灰中的铅以PbCl_4~(2-)形式络合浸取回收。利用所回收的氯化铅制备一氧化铅。实验考察浸取工艺中多种因素对浸取效率的影响,研究浸取母液的循环使用效果和一氧化铅制备过程的转化条件。研究结果表明:在温度为85~90℃,氯化钠质量浓度为250 g/L,工业盐酸用量为25 m L/(100 g),富铅烧结灰(尾泥)与HCl-NaCl混合溶液的固液比为1.0:3.0 g/m L,浸取时间为30 min的条件下,在浸取过程中铅的浸取率在99.50%以上;冷析母液循环使用2次,铅的总回收率达95.08%;碳酸钠的加入量为其理论量的0.90~1.00倍,铅的沉淀率为99.90%,转化得到的沉淀在650℃煅烧5 h,得到的一氧化铅产品纯度为99.50%,达到HG/T 2325—2004标准中工业一级品的指标要求。     

硫脲浸金溶液中金的分离富集与回收

通过对氧化剂浓度，硫脲浓度以及酸度等的条件试验，确定了732型阳离子交换树脂吸附金的最佳条件，对金的吸附率均大于92．5％，依所选择的条件进行铁铜的洗脱，结果显示铁、铜的洗脱率可分别达到70％及100％左右，而金不被解吸，最后选用硫代硫酸钠等络合剂解吸树脂上的金。     

碳质金矿石预氧化焙烧堆浸提金的研究

介绍了对辽宁丹东某金矿碳质硅化低硫金矿石的焙烧预氧化处理及焙砂直接堆浸的试验研究·分析了不同温度、不同气氛及不同时间条件下的焙砂的氧化状态及影响金浸出率的NaCN的质量分数、喷淋强度、焙砂粒度及喷淋时间等主要因素·实验结果表明,先在450℃,通入少量空气(含氧5%～10%)的条件下,焙烧1h(脱砷),然后,在650℃,通入充足空气的条件下,焙烧2h,矿石中的硫化物和碳物质的氧化率和灰化率分别达98%和97%;当NaCN的质量分数为0 10%～0 15%,喷淋强度为15 0L/(m2·h),焙砂粒度为0～3mm,喷淋时间为8～10天,金的浸出率为84 8%·同时,推荐了焙砂直接堆浸的原则工艺流程...     

难处理金精矿的加压氧化一氯化浸出实验

采用加压氧化法对国内某难处理金精矿进行预处理,考察了反应温度、精矿粒度、氧分压、初酸浓度、反应时间对金精矿脱硫率和金浸出率的影响.利用XRD,XRF,SEM,EDX技术对金精矿原矿及浸出渣进行分析表征,实验结果表明,在反应温度180℃,精矿粒度-0.075～+0.061 mm,氧分压0.8 MPa,初酸质量浓度60 g...     

含铜难处理金矿选择性浸出试验研究

针对某含铜难处理金矿进行了碘化法和石硫合剂(lime sulfur synthetic solution,LSSS)法的选择性浸金的研究。结果表明,在碘单质质量浓度为8g/L,浸出时间为2h的条件下,碘化法浸出金的浸出率为88.1%,而且铜的浸出率不足1%。在石硫合剂质量分数为25%,浸出时间为6h的条件下,LSSS法浸出金的浸出率仅为73.5%。对比碘化浸出和石硫合剂浸出效果可知,碘化法对该含铜难处理金矿不仅浸出速度快、浸出率高而且铜几乎不被浸出,具有很强的选择性浸金作用。     

Cyanidation of gold clay ore containing arsenic and manganese

The extraction process of gold and silver from the gold clay ore containing arsenic and manganese was investigated. With the conventional technique, the leaching rates of gold and silver are 78.23% and 49.02%, respectively. To eliminate the negative effects of arsenic and manganese on cyanidation and increase the gold and silver leaching rates, a novel catalyst was added. The content of the catalyst used in the process was 8 g per 500 g org sample, the sample size was 60 μm and the pH value was kept between 10 and 11. Leaching with the catalyst for 3–5 h under certain conditions, the gold leaching rate increased to over 90% and the silver leaching rate increased to 80%–90%. The catalyst can effectively liberate gold and silver from the enclosure of arsenic and manganese and the industrial experiment has great significance to the development and utilization of the gold clay ore containing arsenic and manganese.     

Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system

The extraction of gold from refractory gold ores(RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea system were systematically investigated under different conditions. Results showed that the decomposition rate of thiourea was accelerated sharply in the presence of pyrite. The effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of experiments. The decomposition efficiency of thiourea decreased by 40% and the recovery efficiency of gold increased by 56% after the removal of sulfide by roasting. Under optimal conditions, the efficiency of the gold recovery system increased to 83.69% and only 57.92% of thiourea decomposition was observed. The high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores, such as pyrite and soluble ferric oxide.     

硼镁石真空铝热炼镁还原渣提取高白氢氧化铝

以煅烧硼镁石为原料真空铝热还原炼镁得到的还原渣中富含12CaO·7Al2O3,该还原渣可通过氢氧化钠和碳酸钠的混合碱液溶出得到铝酸钠溶液和富硼料,铝酸钠溶液通过碳酸化分解可制备氢氧化铝.以硼镁石铝热炼镁所得还原渣为原料,研究了溶出温度、时间、碳酸钠及氢氧化钠质量浓度对氧化铝溶出率的影响,并对碳分产物进行性能研究.结果表明,在氢氧化钠质量浓度12g/L,碳碱质量浓度210g/L,溶出时间120min,溶出温度95℃,液固比为6的条件下,炼镁还原渣中氧化铝的溶出率为8521%.氢氧化铝产品为α-Al(OH)3,白度大于98,SEM显示其晶粒小于1μm.     

多金属氧化钼矿工艺矿物学及其综合利用技术研究

对氧化钼矿的工艺矿物学特征及其综合利用技术进行研究.结果表明:氧化钼矿的主要矿物组成为钼华、钼钙矿、褐铁矿、黄铁矿及石英.在磨矿细度为200目以下含量65%时,采用混合浮选工艺,可得钼品位为7.41%的钼精矿,钼回收率为82.18%,其中含铅18.02%、含金7.96 g.t-1、含银1 002 g.t-1;采用联合碱浸法处理钼精矿,可获得钼浸出率为95.61%的工艺指标;采用氰化法处理碱浸渣,金银浸出率分别为94.55%、83.96%;采用浮选法处理氰化渣,可得铅品位为46.76%的铅精矿,铅回收率为52.83%;采用重选法回收浮选尾矿中的石英,可获得SiO2含量为97.12%、回收率为80.84%的石英产品.     

海南某金矿尼尔森重选-浮选试验

以海南某石英脉型金矿石为原料,进行尼尔森重选-浮选试验研究.通过GRG试验得出金矿中重选可回收金质量分数为80.88%.通过条件试验确定了该矿石尼尔森重选-浮选的最佳条件为:磨矿细度-74μm占80%,相对离心力60g,反冲水压16kPa,矿浆质量分数40%,戊基黄药用量200g/t,浮选时间5 min.原矿石品位9.8g/t,利用尼尔森选矿机一次分选可得品位230g/t,金回收率80.30%的重选精矿.重选尾矿品位2.0g/t,经过一次粗选一次精选三次扫选处理,可得浮选精矿品位57.3g/t,浮选金作业回收率75.66%.经尼尔森重选-浮选流程处理后,尾矿金品位降至0.5g/t,全流程金总回收率95.21%.     

从难处理金矿中回收金:黄铁矿对硫脲浸金体系稳定性的影响

The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea system were systematically investigated under different conditions. Results showed that the decomposition rate of thiourea was accelerated sharply in the presence of pyrite. The effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of experiments. The decomposition efficiency of thiourea decreased by 40% and the recovery efficiency of gold increased by 56% after the removal of sulfide by roasting. Under optimal conditions, the efficiency of the gold recovery system increased to 83.69% and only 57.92% of thiourea decomposition was observed. The high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores, such as pyrite and soluble ferric oxide.