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氰渣综合利用提取金银的试验研究 总被引:3,自引:0,他引:3
通过正交试验详细考察了矿浆浓度、硫酸过剩系数、反应温度和反应时间等因素对氰渣浸铁率的影响.结果表明矿浆浓度为35%、硫酸过剩系数为1.3、反应温度为100℃、反应时间为2.5 h的试验条件下,铁的浸出率最高,可达97.80%.对比氰渣和浸铁渣金、银的氰化浸出效果发现氰渣再氰化金、银的浸出率分别为5%和10%,而浸铁渣再氰化金、银的浸出率则分别高达87%和80%,因此氰渣浸铁再氰化是提高金、银回收率的有效途径之一. 相似文献
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采用直接氰化浸出、氨预处理及氨氰浸出等方法处理含硫化铜的金矿。研究这些浸出体系中金和铜的溶解行为。当NaCN含量小于5g/L时,金的氰化浸出受到所含硫化铜的严重干扰,这与组分平衡计算结果一致。氨预处理可以消除铜的干扰,在后续的氰化浸出过程中,即使在剂量较小的情况下,金也可以获得较高的提取率。采用Box-Behnken试验设计研究了氨氰体系中NH3、NaCN和Pb(NO3)2的主要影响以及其相互作用。其中NH3和NaCN浓度是影响金提取率的主要因素,而Pb(NO3)2的影响有限。增加NH3的浓度可以提高金提取的选择性和提取率,同时降低氰化物的用量。统计研究结果表明试剂间的相互作用对金提取无重大影响。氨预处理和氨氰浸出法在含硫化铜的金矿的处理中具有广阔的应用前景。 相似文献
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对金品位为2.02 g/t的某低品位氧化微细粒金矿开展了全泥浸出提取金的试验研究。优选出非氰浸出剂CC-1,确定了相应工艺参数,在此基础上开展了3个粒级柱浸试验,对柱浸含金溶液进行了活性炭吸附试验,研究表明该矿石适宜于利用非氰浸出剂CC-1堆浸回收金。矿石磨至-200目占80%、矿浆液固比2:1、石灰用量3000 g/t原矿、CC-1浓度0.10%、浸出时间30 h条件下金浸出率92.75%;在石灰用量3000 g/t、CC-1浓度0.10%、浸出时间10 d时-10 mm矿样Au浸出率92.46%,浸出时间15 d时-20 mm及-30 mm矿样Au浸出率分别为91.49%、89.24%。采用CC-1作为浸出剂的含Au溶液活性炭吸附率为95.72%~97.11%。 相似文献
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用石硫合剂(LSSS)法从高铅金精矿浸出金 总被引:3,自引:1,他引:2
石硫合剂法是最新的无氰提金技术。石硫合剂法浸金机理是:电化学──催化机理。本文对石硫合剂法浸出高铅顽固金精矿样的工艺研究表明:石硫合剂法对顽固金精矿的适应性良好,采取二段浸出工艺,金浸出率可达99%,为国内外大量顽固金矿的开发利用提供了条件和可能途径。 相似文献
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采用硫酸分解焙烧金精矿,金从黄铁矿中解离的同时金得到了富集,可采用氯化铁溶液非氰浸出金。研究了硫酸浓度及过量系数、分解温度对铁分解率的影响,优化工艺条件为,焙烧温度180 ℃,反应时间90 min,硫酸过量系数1.2,在此条件下,铁分解率为92.14%,金含量从原来的51.7 g/t提高到106.1 g/t;研究了反应温度、液固比对氯化铁溶液浸出硫酸浸出渣中金的影响,优化浸出条件为,液固比1.5,80 ℃浸出90 min,在此条件下,金浸出率96.8%。 相似文献
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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 相似文献
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《中国有色金属学会会刊》2020,30(7):1964-1979
Differences of cyanide leaching between the calcine and the dust from a refractory gold concentrate were investigated by comparative method. Results showed that gold leaching efficiencies of the calcine and the dust were 85.31% and 54.30%, respectively, with direct cyanidation. Contents and existing forms of arsenic and carbon were the main reasons for those differences. The maximum gold leaching efficiencies of the calcine and the dust were 87.70% and 58.60%, respectively, with cyanidation after NaOH pre-leaching. Harmful elements removal, gold loss in NaOH pre-leaching and iron oxides hindrance codetermined gold leaching efficiencies of the calcine and the dust. After H2SO4 pre-leaching, the maximum gold leaching efficiencies of the calcine and the dust achieved 94.96% and 80.40%, respectively. The effect of carbonaceous matter was the main reason for differences for leaching efficiencies of the calcine and the dust. Based on those differences, two proper gold extraction processes were put forward, and gold leaching efficiencies for the calcine and the dust achieved 94.91% and 91.90%, respectively. 相似文献
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O. CELEP I. ALP H. DEVECI M. VICIL 《中国有色金属学会会刊》2009,19(3):707-713
The amenability of a refractory ore to the extraction of gold and silver by cyanide leaching was investigated. Diagnostic leaching tests were also performed to shed light on the refractory characteristics of ore. The leaching tests show that the extraction of gold and silver is consistently low, i.e. ≤47% and ≤19.2%, respectively, over a leaching period of 24 h. Even fine grinding (e.g. <38 μm) does not improve the recovery of gold and silver. Diagnostic leaching approach provides information into the cause of the refractoriness of the ore. The findings suggest that the refractoriness is induced by the dissemination and encapsulation of the very fine gold and silver particles largely in the carbonates, oxides and sulfides and, to a small extent, with silicates present in the ore matrix. These findings highlight the practical importance of diagnostic leaching for the understanding of the refractory characteristic of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching. 相似文献
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1 INTRODUCTIONTherearetwotypesoforbitalsinouterelectronorbitalsofgoldanditslixiviants[1,2 ] .OneiscalledHOEO(higheroccupiedelectronicorbitals) ,suchasπ typeHOEOofboth 5d2(x2 -y2 ) and 5d2zofgold ,andσ typeHOEOofσ22 pxofcyanide;andanothercalledLUEO(lowerunoccupiedelect… 相似文献
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F. XIE D. B. DREISINGER 《中国有色金属学会会刊》2009,19(3):714-718
Low gold and silver leaching kinetics has been commonly observed in traditional gold-silver cyanidation process, especially in heap leaching and in situ leaching operations. The different mineralogy of gold and silver in the ores is suspected to be the main reason, e.g., the occurrence of low solubility acanthite (Ag2S) typically results in low overall silver extraction. Due to the low solubility of oxygen in cyanide solution, the reactivity and availability of oxidant is believed to be the critical limitation for gold and silver dissolution. The use of ferricyanide as the auxiliary oxidant for gold and silver cyanidation has been examined. The rotating disc test results prove the assistant effect of ferricyanide on increasing the dissolution rate of gold and silver. The potential use of ferricyanide in gold/silver cyanidation process is proposed based on the leaching results of actual ores. 相似文献
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孟宇群 《中国有色金属学会会刊》2005,15(5):1178-1184
A new hydrometallurgical process for a carbonaceous refractory gold concentrate at ambient temperature and pressure was presented, including grinding-leaching, intensified alkaline leaching(IAL), thiosulfate leaching and cementation by zinc powder. The experimental results show that the grinding-leaching and intensified alkaline leaching process result in the selective oxidation of arsenopyrite and pyrite. The oxidation ratio of As is 96.6%, and 46.7 % for S. The total consumption of NaOH in alkaline leaching is only 28 % of that theoretically calculated under the conditions of full oxidization for the same amount of arsenopyrite and pyrite transforming into arsenates and sulfates, and 83.6% of gold is synchro-dissoluted by thiosulfate self-generated during pretreatment. Since the carbonaceous matter in concentrate possesses a strong capability of preg robbing, the cyanidation process is not suitable for the extraction of gold after pretreatment. However, the gold leaching rate by thiosulfate leaching for 24 h is increased to 91.7% from 0 - 3.2% by ultra-fine grinding without the pretreatment. The recovery of gold by zinc cementation gets to 99.6%. Due to the thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal one. 相似文献
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超声强化原位电氯化法浸取难处理金矿 总被引:1,自引:0,他引:1
对采用超声波和非超声波两种条件作用下原位电化学生成氧化剂浸取难处理金矿进行了研究.结果表明:采用超声波能够显著地提高金的浸出率,且缩短浸取反应时间.在没有超声波条件下采用原位电氯化法浸取6h,金的浸出率为54.84%;但在超声波作用下,金的浸出率可达90.68%.另外,通过对浸取前后矿渣的XRD图谱比较可知,没有使用超声强化的电氯化浸取后矿渣表面检测到元素硫,而用超声作用的矿渣表面则没有检测到硫.并由此分析了超声波对金矿浸出的作用机理和对电极反应的影响. 相似文献