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研究了淀粉降解预处理还原分离锰银氧化矿工艺原理及主要影响因素,当以vMn:vH2SO4:v(C6H10O5)n:vH2O=1:1.8 b:16.66 a:30配料时,锰浸出率达95.93%,银的浸出损失率<2%;浸锰渣采用氰化法提银,1 t渣用氰化钠1 kg、浸出时间3 h时,银浸出率94.15%;浸锰-氰化两步浸出银的回收率大于92.27%,锰与银被有效分离;分离工艺具有免焙烧、原矿适用面广、淀粉用量少、分离成本低等特点,具有较好的实际应用价值. 相似文献
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介绍了利用植物副产物(秸秆、粮食加工副产壳类等)作为还原剂还原浸出氧化型锰银精矿中的锰、浸锰渣氰化浸银的锰银分离工艺。玉米秸秆还原浸锰条件:秸秆粉在95 ℃预降解糖化0.5 h、降解糖化液与精矿的体积质量比为3 mL/g、硫酸与锰的物质的量比为1.4、秸秆与精矿的质量比为0.275、95 ℃浸出5 h,在此条件下锰的浸出率约92%。浸锰渣氰化浸银条件:每吨浸锰渣氰化钠用量为3 kg、常温浸银3 h,在此条件下银的浸出率达到92.20%。研究的锰银分离工艺具有较好的综合效果。 相似文献
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为回收某低品位锰银矿中的锰、银金属,试验以硫铁矿作还原剂,用硫酸浸出矿石中的锰;浸锰渣用硫脲浸出银。针对试样矿石,试验研究了浸出的工艺条件,选择适宜的浸出工艺进行试验,锰的浸出率达到97.10%,银的浸出率达88.91%。 相似文献
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为考察碱性硫脲体系对不同类型金矿浸出的适应性,选用理化性质不同的6种含金物料,分析了其化学组成及矿物物相,并对其浸出行为进行了研究. 结果表明,稳定剂Na2SO3和Na2SiO3大大降低了碱性硫脲的分解率,随稳定剂浓度的增大,硫脲分解率逐渐降低;而且Na2SiO3对碱性硫脲的稳定效果明显优于Na2SO3,当Na2SiO3浓度为0.3 mol/L时,硫脲的分解率由72.5%降至33.8%. 铁氰化钾为适合碱性硫脲浸金的温和氧化剂. 碱性硫脲体系中金矿物浸出前后物相基本无变化. 所选择的金矿物中均含有大量耗碱物质,使溶液的pH值由12.5很快降至中性,但稳定剂Na2SiO3能维持体系的pH值在12左右,有利于浸出过程的进行. 碱性硫脲体系中伴生金属浸出率小于0.1%,浸金具有显著的选择性. 碱性硫脲体系适合浸出经预处理的物相主要为SiO2的氧化矿,浸金率高达82.68%,为碱性硫脲成功应用于黄金工业生产提供了一定的理论依据. 相似文献
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用乳酸还原浸出低品位软锰矿,采用单因素实验考察乳酸用量、反应时间、温度、硫酸用量等因素对锰浸出率的影响,用响应面法对反应条件进行了优化,用高效液相色谱测定了反应中的有机物,对还原浸出产物进行了研究. 结果表明,在锰矿粉加入量10.0 g、乳酸用量1.2 mL、反应时间3.47 h、温度90℃、硫酸用量12%、搅拌速率200 r/min、液固比10 mL/g条件下,锰的浸出率可达93.99%. 还原产物为丙烯酸、甲酸和乙酸;还原浸出60 min后乳酸反应基本完全,210 min内丙烯酸含量降低不明显,甲酸和乙酸含量缓慢增加. 相似文献
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结合电解锰生产工艺,以氧化锰矿为原料,以电解锰生产过程产生的电解阳极液废水配置烟气脱硫浆液,在其中添加FeSO4强化电解锰阳极液体系下氧化锰矿烟气脱硫及浸锰能力,探讨铁强化氧化锰矿烟气脱硫和浸锰的工艺条件对烟气SO2脱除和锰浸出的影响机制。研究发现FeSO4的加入,通过FeSO4与MnO2之间的氧化还原反应以及产物三价铁离子和二价锰离子的协同催化作用,可同时提高锰矿烟气脱硫效率和锰的浸出率。锰矿粒径越小,脱硫及浸锰效率越高。温度升高,氧化锰矿浆液烟气脱硫率逐渐下降,浸锰率则先升高后下降,并在60℃时达到最大。浆液液固比和烟气流量的增大均会导致烟气脱硫率的下降,但会提高氧化锰矿浸锰率。进口SO2浓度过高会导致脱硫率下降,但更有利于浸锰。采用5级逆流吸收对7%的烟气进行铁离子强化氧化锰浆脱硫,得到最终SO2出口浓度293μL/L,溶液Mn2+浓度为44.72g/L,满足电解要求。铁强化电解锰阳极液体系有效回收利用了电解锰生产废水,不仅集脱硫浸锰工艺为一体,且可实现脱硫和浸锰效率的同时提升,为电解锰行业的清洁生产和资源综合利用提供理论依据和技术参考。 相似文献
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探讨了用非氰化法从混合型金矿中浸取金的可能性,主要研究了硫脲法浸金时,硫酸铁浓度,硫脲浓度,酸度,温度,浸取时间及固液化等实验条件对金浸出率的影响,并与微波等方法进行了比较。 相似文献
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A hydrometallurgical process to extract silver from the silver-lead ore in Boorchi, Mongolia by using thiourea leaching solution is studied in this work. Through the observation of optical and scanning electron microscopes, and energy spectral analysis, it is determined that 5 kinds of silver minerals exist in the ore, including argentite, Ag-tetrahedrite, Ag-Zn-Sb-tetrahedrite, freibergite and acanthite. The experimental results of direct thiourea leaching of the ore show that 56%~60% of silver is leached. The main reason for the low leaching rate is due to silver minerals enveloped in galena and other minerals, even though the ore is ground to the particle size of 75 mm. When the ore is pretreated with ammonium carbonate solution under oxidation, the experimental results of thiourea leaching show that the leaching rate of silver increases to near 75% with the pretreatment. Based on the leaching experiments, a principle hydrometallurgical technological route to extract silver from the Ag-Pb ore is proposed. 相似文献
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硫铁矿烧渣综合利用试验研究 总被引:10,自引:0,他引:10
张泽强 《化学工业与工程技术》2002,23(4):4-5
为避免硫铁矿烧渣对环境的污染 ,以硫铁矿烧渣为原料 ,通过添加活性还原剂 ,用废硫酸直接还原浸出铁并制铁黄 ,同时用以二 - 2乙基己基磷酸为主体的三元萃取剂萃取回收浸液中的铜 ,用全泥氰化和锌粉置换工艺从浸渣中提取金银 ,较经济有效地回收利用了烧渣中的有价金属 ,铁、铜和金的回收率分别达到了 93.31%、80 .78%和 90 .18%。 相似文献
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A hydrometalhirgical process to extract silver from the silver-lead ore in Boorchi, Mongolia by using thiourealeaching solution is studied in this work. Through the observation of optical and scanning electron microscopes, and energyspectral analysis, it is determined that 5 kinds of silver minerals exist in the ore, including argentite, Ag-tetrahedrite,Ag-Zn-Sb-tetrahedrite, freibergite and acanthite. The experimental results of direct thiourea leaching of the ore show that56%~60% of silver is leached. The main reason for the low leaching rate is due to silver minerals enveloped in galena andother minerals, even though the ore is ground to the particle size of 75 μm. When the ore is pretreated with ammoniumcarbonate solution under oxidation, the experimental results of thiourea leaching show that the leaching rate of silver increasesto near 75% with the pretreatment. Based on the leaching experiments, a principle hydrometallurgical technological route toextract silver from the Ag-Pb ore is proposed. 相似文献
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Z. Gamino Arroyo M. Stambouli D. Pareau A. Buch G. Durand M. Avila Rodriguez 《溶剂提取与离子交换》2013,31(2):128-144
Abstract This paper deals with the solvent extraction of silver from thiourea leaching Ag ore liquors as an alternative to the traditional process involving cyanide. The investigation of the extraction mechanism of silver from acidic thiourea solution had not been clearly established to date. The extraction behavior of silver using di(2‐ethylhexyl)dithiophosphoric acid (D2EHDTPA) and di(2,4,4‐trimethylpentyl) thiophosphinic acid (CYANEX 302) was studied. The effect of various parameters such as concentrations of metal, mineral acid, thiourea, and extractant has been investigated. The extracted complexes have been identified through a slope method analysis as AgX(HX)5 for CYANEX 302 and AgX for D2EHDTPA, where HX denotes the extractant. Moreover, complete stripping was ensured with a mixture of NH4SCN and H2SO4. In addition we showed that a first step of extraction with D2EHPA or CYANEX 272 results in the preferential separation of Fe(III) from the Ag(I) leach solution. 相似文献
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难处理金矿石浸出工艺研究现状 总被引:6,自引:0,他引:6
针对难处理金矿石进行了定义,简述了其难处理的原因及其相应对策。对氰化浸金前的焙烧氧化、热压氧化、生物氧化、化学氧化等预处理方法进行了综述,并就其相互的优缺点进行了比较;同时也对非氰浸金剂如卤素、硫脲、硫代硫酸盐等,以及它们的浸金机理和优缺点进行了评述。 相似文献