多硫化物微细粒浸染型金矿回收金试验研究

为回收某含碳高砷高硫微细粒复杂难处金矿中的金,分别开展了全泥氰化浸出、浮选、焙烧、酸浸试验研究。结果表明,采用常规的全泥氰化浸出和浮选工艺,对金的回收效果均不好。采用“焙烧-全泥氰化浸出”工艺,受矿石焙烧后新产生的金属氧化物包裹金的影响,金浸出率仅有72.25%。经研究发现,采用酸溶方法,对焙砂进行加温酸浸预处理,可有效打开其被包裹的金,从而提高对金的回收。采用矿石“焙烧-酸浸-水洗-碱浸-全泥氰化浸出”联合工艺,金浸出率88.52%。     

焙烧-氰化浸出锰银矿中银的扩大试验

采用添加剂焙烧-氰化浸出中试处理锰银矿。回转窑连续运转80 h，物料焙烧时间30±5 min，所得焙砂产率85.54%，焙砂中银含量237.73 g/t、锰含量24.68%，银回收率99.19%，锰回收率98.70%；焙砂经500 L反应釜直接氰化浸出，浸出液固比2:1~2.2:1，时间6~15 h，氰化钠用量700 g/t原矿，所得银浸出率86.5%，氰化尾渣满足冶金用锰矿石标准。     

富硫高砷难浸金精矿的氰化浸出工艺研究

研究富硫高砷金精矿在加入碱熔剂经低温焙烧预处理后,再加活性添加剂条件下的氰化工艺,结果表明,金的氰化浸出率从直接氰化或沸腾炉焙烧后的焙砂氰化的30%～50%提高到87%～93%,浸出速度也有很大提高.     

高砷难处理硫精矿氰化浸出提银实验研究

某硫精矿中的银矿物嵌布粒度非常细小,包裹于硫化物中的银约占50.46%,属于难处理高砷含银硫精矿。采用细磨后化学预处理氰化浸出,银浸出率仍然低于80%;硫精矿经氧化焙烧后,As、S的脱除率都达到90%以上,但银浸出率却较低;对该含银硫精矿添加钠盐焙烧预处理,再采用常规氰化法浸出,银浸出率显著提高,达到85.15%,同时氰化钠耗量降低至2.0 kg/t。     

焙烧-氰化工艺处理含金硫精矿提高银回收率的研究

采用焙烧-氰化工艺处理复杂含金硫精矿时,银的回收率偏低,为了提高该过程银回收率,详细的研究了焙烧制度、焙烧料加添加剂、盐浸条件和氰化条件等对银回收率的影响。试验结果表明,焙烧过程中加添加剂和焙烧温度是影响银回收率的2个关键因素;提高银回收率适宜的条件为:焙烧时加入5%添加剂A,温度控制在450~500℃,所得焙砂经酸浸铜、盐浸铅后,在液固比2~3,氰化物质量分数0.4%,搅拌氰化24 h,弃渣含银40 g/t,银的总回收率81%。     

焙烧氰化尾渣提金工艺研究现状

焙烧氧化过程中铁物相出现熔融或再结晶,对金造成二次包裹,使焙砂中部分金仍难以浸出,导致焙烧氰化尾渣金品位较高。破坏尾渣中铁氧化物对金的包裹可提高金的浸出率。综述了焙烧氰化尾渣主要提金工艺,包括直接酸溶法、还原焙烧法、氯化法、炼铁-电解法、硫酸熟化法和硫脲法等。直接酸溶工艺简单,金浸出效果较差;还原焙烧法金浸出率高,但工艺复杂、能耗大;氯化焙烧法对矿石适应性强,可综合回收有价金属,但基建及维护费用高;炼铁-电解法在富集金的同时可获得纯铁产品,对矿石有较高的要求;硫酸熟化法显著提高金银浸出率,与直接酸溶法相比,所需更高的温度与酸度;硫脲法反应速率快、选择性好,但生产成本较高。 关健词:有色金属冶金;氰化尾渣;铁氧化物;包裹金;提金     

从镍钼矿中提取镍钼的工艺

针对现行镍钼矿处理工艺存在的钼镍需要分别提取的缺陷,提出镍钼矿加钙氧化焙烧-低温硫酸化焙烧-水浸提取镍钼的新工艺。以贵州遵义镍钼矿为原料,对CaO加入量、氧化焙烧温度、氧化焙烧时间、硫酸加入量、硫酸化焙烧温度、硫酸化焙烧时间以及焙砂水浸工艺参数对镍钼浸出率的影响进行研究。结果表明:在最佳工艺条件下,钼的浸出率为97.33%,镍的浸出率为93.16%,且最佳工艺参数为100 g镍钼矿加入35 g CaO,700℃氧化焙烧2 h,得到的焙砂加入70 mL浓硫酸,再经250℃硫酸化焙烧2 h;硫酸化焙烧得到的焙砂按液固比2:1加水搅拌,经98℃浸出2 h。加入CaO不仅能有效减少镍钼矿氧化焙烧烟气对环境造成的污染,而且能显著提高镍的浸出率。     

氯化焙烧综合回收硫精矿中有价金属研究

银山硫精矿含金1.40 g/t，银21.0 g/t，铜0.17%，硫47.08%，铁41.21%，具有较高的经济价值，仅作为硫精矿制酸将造成资源浪费。针对该硫精矿进行了“氧化焙烧-焙砂制粒-氯化焙烧”的工艺条件试验。扩大试验各金属挥发率为金96.72%，银90.91%，铜52.48%，熟球含铁60.72%，抗压强度2.105 kN，达到三级品要求，实现了硫精矿中有价金属的综合回收。由于扩大试验焙烧设备及操作方面的原因，铜的挥发率远低于小型试验，在实际生产中须予以重视。机理分析表明，焙烧时需要采取必要措施抑制氯化钙在低温度下的分解，提高氯化钙的利用率。     

云南某氧化银矿选矿试验研究

采用浮选+全泥氰化工艺对云南省某银矿石进行提银选矿试验研究。矿石中银多金属复硫盐经浮选富集得到银精粉;浮选尾矿再全泥氰化提银。浮选作业所得银精粉品位5761.54 g/t,回收率21.91%;浮选尾矿全泥氰化浸渣品位19.28 g/t,浸出率78.85%。综合回收率84.12%。银多金属复硫盐是影响浸出率的关键因素,预先将其有效浮选,有利于提高银氰化浸出率。     

含砷硫难处理金矿石选冶工艺研究

对含砷，硫金矿的矿石性质以及主要矿物的嵌布特性，金的提取工艺进行了研究和比较，采用常规提金工艺流程以及达到理想的指标，而采用浮选法选出浮选精进行焙烧，焙砂及浮尾再用ＮａＯＨ处理后进行全泥氰化的选冶工艺流程，能获得较好的选冶技术指标，金浸出率可达８５％以上。     

磁化焙烧对氰化尾渣中金、铁回收的影响(英文)EI北大核心CSCD

对氰化尾渣的焙烧预处理及其对有价金属综合回收的影响进行了研究。结果表明:当焙烧温度为750℃、焙烧时间为1.25h、还原剂添加量为6%时,铁的磁化率为86.27%,金的浸出率达到46.14%。结合矿物构造与赤铁矿磁化焙烧原理,探讨了焙烧对金浸出影响的机理,认为赤铁矿磁化焙烧后解离出的包裹金,是提高金浸出率的主要来源。     

Recovery of vanadium from vanadium slag by composite roasting with CaO/MgO and leaching

A novel process of composite roasting with CaO/MgO and subsequent acid leaching was proposed to improve the recovery rate of vanadium from Linz–Donawiz (LD) converter vanadium slag. The effects of the MgO/(CaO+MgO) molar ratio and the roasting and leaching parameters on the recovery of vanadium were studied. The results showed that the leaching efficiency of vanadium decreased from 88% to 81% when CaO was replaced completely by MgO; however, it could be improved by roasting with the composite of CaO/MgO. The maximum vanadium leaching efficiency of 94% was achieved under the optimum MgO/(CaO+MgO) mole ratio of 0.5:1. The results from X-ray diffractometry (XRD) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM−EDS) confirm that the formation rate of acid-soluble vanadates can be enhanced during roasting with the composite of CaO/MgO and that the leaching kinetics can be accelerated owing to the suppression of calcium sulfate precipitation.     

Production of TiO<Subscript>2</Subscript> from CaTiO<Subscript>3</Subscript> by alkaline roasting method

CaTiO3 was decomposed by alkaline roasting method for the production of TiO2.The process included alkaline roasting, water leaching and acid leaching steps.In the alkaline roasting step, the factors such as roasting temperature and NaOH/CaTiO3 molar ratio were investigated and 99.5% TiO2 could be extracted from CaTiO3.In addition, it is believed that only ion-exchange between Ca2+ and Na+ takes place, while the structure of TiO 32-in CaTiO3 was not destroyed during the roasting process.In the acid leaching ...     

Extraction of valuable metals from low nickel matte by calcified roasting−acid leaching process

A calcified roasting−acid leaching process was developed as a highly effective method for the extraction of valuable metals from low nickel matte in the presence of CaO additive. The influences of process parameters on the metal extraction were studied, including the roasting temperature, roasting time, addition of CaO, H₂SO₄ concentration and liquid−solid ratio. Under the optimum condition, 94.2% of Ni, 98.1% of Cu, 92.2% of Co and 89.3% of Fe were recovered. Additionally, 99.6% of Fe was removed from the leachate as goethite by a subsequent goethite iron precipitation process. The behavior and mechanism of CaO additive in the roasting process was clarified. The role of CaO is to prevent the formation of nonferrous metal ferrite phases by a preferential reaction with Fe₂O₃ during the roasting process. The metal oxides (CuO and Ni_xCu_1−xO) remained stable during high-temperature roasting and were subsequently efficiently leached using a sulfuric acid solution.     

焙烧氰化尾渣中金、银和铁的回收利用研究进展

焙烧氰化尾渣是黄金生产排放的一类危险固体废物,其中的金、银和铁等有价金属元素仍可作为二次资源利用。系统总结了国内外在回收焙烧氰化尾渣中金、银和铁的研究进展,分析了磁化焙烧法、硫脲浸出法、氯化浸出法、高温氯化焙烧法、强酸预浸-氰化浸出法、直接还原焙烧法和细磨法在资源综合回收利用中的优缺点,指出焙烧氰化尾渣的资源化、减量化和无害化的发展方向。     

钨渣回收制备四氧化三锰新工艺

研究从钨渣中回收锰的新工艺,通过钨渣的低温硫酸化焙烧、烧结块浸出、浸出液除杂、溶液中水解沉锰及氢氧化锰氧化获得Mn3O4粉末,采用SEM和XRD对产品粉末进行分析。结果表明:在浓硫酸过量150%、焙烧时间90 min、浸出温度98℃、浸出时间120 min的条件下,Mn浸出率达到88.9%。浸出液可以通过硫化物沉淀除重金属、硫酸复盐沉淀法深度净化除杂、中和水解除Fe,水解沉锰也有一定的净化作用,溶液pH值为6.56时,除铁率达到99.91%。净化液经水解沉锰后采用10%H2O2氧化,在氢氧化锰氧化过程中,溶液pH值对产物物相的影响较大;溶液pH值为8时在50℃沉锰,并以过量150%的H2O2氧化反应20min,获得粒度小于0.1μm的Mn3O4粉末。     

Sulphatizing roasting of Cu-Zn and multimetal complx slphides

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Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process

A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 °C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of gold and zinc. Eventually, the chlorinated volatiles of gold and zinc could be recovered by alkaline solution.