金精矿碘化浸出过程动力学

采用碘-碘化物体系对金精矿进行浸出,通过实际矿石的浸出试验考察搅拌速度、浸出温度、碘浓度及碘离子浓度对金精矿碘化浸出反应动力学的影响。结果表明:提高搅拌速度对金的浸出有不利影响;通过对影响该体系动力学参数的考察,发现其符合核收缩模型,反应过程总体由界面化学反应控制,其表观活化能为31.674kJ/mol,碘浓度和碘离子浓度的反应级数分别为1和0.5,建立了金精矿碘化浸出过程的反应速率方程。     

含碳砷金精矿焙烧浸出工艺的研究

通过对含碳、砷浮选金精矿的配比焙烧试验，进一步探讨二者比例关系的最佳结合点，在提高含碳、砷难选金相矿的选矿回收率方面做出了大胆的尝试，并取得了一定的成果。     

盐酸浸出焙烧金精矿工艺研究

研究了盐酸浓度、反应温度、液固比和反应时间对盐酸浸出焙烧金精矿的影响,用正交试验优化工艺条件。单因素实验表明,盐酸浸出焙烧金精矿的浸出率与盐酸浓度、反应温度和反应时间呈正相关趋势,液固比为1.5:1时具有最大的金浸出率。正交试验表明,在所选择的因素水平范围内,盐酸浓度影响最为明显,反应温度和反应时间影响较大,液固比影响最小。在优化反应条件下(盐酸浓度8 mol/L、液固比1.5:1、90℃浸出90 min),金的浸出率达到95.53%。盐酸浸出后焙烧金精矿中大量赤铁矿被浸入溶液,释放包裹金的同时增加了Fe³⁺浓度,促进了金的浸出。     

稀盐酸加压浸出攀枝花钛精矿生产人造金红石的探讨

对攀枝花钛精矿，采用稀盐酸加压浸出法生产人造金红石的适应性和工业生产中存在问题进行了探讨。用该方法可得到高品位人工造金红石，并能满足氯化法钛白生产和海绵钛生产对原料的要求。     

砷锑金精矿冶炼工艺研究

以龙王江砷锑金精矿为原料，采用酸性A^＃氯化剂浸出－焙烧脱砷硫－氰化提金工艺流程，锑、砷分离效果好，得到较好的经济技术指标。     

硫化锌精矿加压浸出过程的热平衡

笔者对硫化锌精矿加压浸出过程的热平衡进行了计算。计算结果表明,反应热不足以平衡物料升温至150℃温度时所需的热量,需从外部补充热量。针对这一问题,提出一种为保持设定的浸出温度返回浸出的废电解液需要达到的预热温度的计算方法。     

有机溶剂在浆萃取对锌精矿直接浸出的影响

研究了锌精矿直接浸出时的在浆有机溶剂萃取，通过扫描电镜分析比较了浸出前矿粒以及两种不同浸出渣的表面形貌。结果表明，四氯乙烯是一种非常有效的萃硫有机溶剂，其加入时间控制为0．5－1．5h，当有机相与无机相（O／A）之比值小于1／50时，锌浸出率随O／A比值的增大而增大；但当O／A比值超过1／50时，锌浸出率并不受相比的影响。     

难冶金精矿烟尘中铁砷碳的脱除对氰化浸金的影响

以难冶金精矿烟尘为原料,研究了氢氧化钠浸出、硫酸浸出以及硫酸与氢氧化钠联合浸出对烟尘中砷、铁和碳脱除及氰化浸金的影响。结果表明:在氢氧化钠浓度为6mol/L时,砷、碳脱除率分别为99.66%和60.63%,金浸出率为58.90%,较直接氰化浸出仅提高4.60%,砷的有效去除不能有效提高金的浸出率。在硫酸质量分数为15%时,铁、砷和碳脱除率分别为33.65%、80.38%和12.59%,金的浸出率为80.40%,与氢氧化钠浸出相比,硫酸浸出解离铁能有效提高金的浸出率。烟尘分别经过质量分数为15%硫酸浸出后氰化浸金,两次2 mol/L氢氧化钠浸出和氰化浸金后,烟尘中铁、砷和碳的总脱除率分别为33.65%、95.63%和79.60%,渣率为80.33%。此时,金的总浸出率为91.90%,氰化渣中金的含量为3.31g/t。与烟尘直接氰化浸出相比金的浸出率提高37.60%。     

浅析温度对金浸出率的影响

温度的不稳定给阿希金矿金泥酸浸一次性浸出造成了很大的影响。因此我们通过试验来确定最佳酸浸温度，提高金的浸出率。     

含锑金精矿碱性硫化钠浸出锑研究与工业实践

为了回收含锑金精矿中的锑，减少锑对两段焙烧过程的影响，对浮选富集得到的含锑金精矿进行硫化钠碱性浸出锑研究。优化实验表明，在液固比1.5:1 (mL/g)，氢氧化钠用量20 g/L，硫化钠用量40 g/L，反应温度80℃，浸出30 min，锑浸出率可达98%以上。在此基础上，采用焙烧炉余热将电解贫液加温至80℃，对液固分离方式、锑电积阴阳极板和冷冻结晶装置进行工艺改造，使锑的浸出率>98%、阴极锑纯度>95%，日产锑量增加17.35%。     

水合肼还原-重量法测定氯化浸金液中金含量

采用水合肼还原氯化浸金液(氯金酸溶液)中的金,称量析出海绵金的质量,实现了海绵金的准确测定,考查了反应温度、试液金浓度、水合肼使用量等对于测定结果的影响,并与其它测定方法进行了比对。调整氯化浸金液金浓度约为40 g/L,加入水合肼(用量1.5 mL/g-Au)还原后加热溶液微沸20 min,损失在滤液中的金量可忽略。测定结果的相对标准偏差(RSD)小于0.2%。方法操作简便,可满足生产分析的要求。     

不同含砷类型金矿的细菌氧化-氰化浸出

对含砷类型不同的金精矿和单矿物进行细菌氧化-氰化浸出研究,分析毒砂和雄黄对金精矿细菌氧化-氰化浸出效果的影响。结果表明:在细菌氧化过程中,含砷金精矿中的毒砂易被氧化分解,经过192 h的细菌氧化后,脱砷率可达93.10%;而雄黄无法被细菌氧化分解,且影响细菌活性,延长浸矿的停滞期;在氰化浸出过程中,毒砂非常稳定,不参与任何副反应;而雄黄易与CN-及保护碱发生副反应,且产生的沉淀物质会在金粒表面形成薄膜,从而降低氰化浸出效率。     

Intensified alkaline leaching pretreatment of refractory gold concentrates at common temperature and pressure

1　INTRODUCTIONWhenaproportionofgoldcontainedinasulfidicconcentrateisinsolidsolutionwithinarsenopyrite ,ultra finegrindingmaynotresultincomplete goldliberation ,andoxidativedestructionofthesulfidesmaybenecessary .Theoptionsareroasting ,pressureoxidationorbacterialoxidation[1] .Conventionalmethodsofalkalineleachingofgoldarsenosulfidecon centratesinanautoclaverequireexpensiveequipmentaswellashigh costenergyandreagents .Rossovsky[2 ] reportedanalkalineleachingmethodwhichcontainsfinegrinding(…     

难冶金精矿焙砂和烟尘氰化浸金的差异（英文）

采用对比方法研究难冶金精矿焙砂和烟尘氰化浸金的差异。结果表明,直接氰化时焙砂和烟尘中金的浸出率分别为85.31%和54.30%。砷、碳含量及其存在形式是导致两者金浸出率差异的主要原因。对于NaOH预处理后氰化浸金,焙砂和烟尘中金的最大浸出率分别为87.70%和58.60%。有害元素的脱除、碱浸预处理过程中金的损失及铁氧化物的阻碍共同决定碱浸预处理后焙砂和烟尘中金的浸出率。经H₂SO₄预处理后,焙砂和烟尘中金的最大浸出率分别达到94.96%和80.40%。碳质物的影响是焙砂和烟尘中金浸出率差异的主要原因。基于这些差异,提出两种适宜工艺,焙砂和烟尘中金的浸出率分别达到94.91%和91.90%。     

A new extraction process of carbonaceous refractory gold concentrate

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.     

H2SO4分解铁-FeCl3浸出焙烧金精矿中金

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%。     

Review of gold leaching in thiosulfate-based solutions

Numerous non-cyanide leaching lixiviants have been developed, among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity, low price, high leaching rate and excellent characteristics in dealing with carbonaceous and copper-bearing gold ores. The traditional copper−ammonia−thiosulfate system has been studied extensively. However, with many years of process development, there are still some problems and challenges with this gold leaching system. A series of studies using nickel-, cobalt- and ferric-based catalyst to substitute copper have been conducted with the purpose of reducing the consumption of thiosulfate. A variety of non-ammonia thiosulfate leaching systems including oxygen−thiosulfate, copper−thiosulfate, copper−EDA−thiosulfate, ferric− EDTA−thiosulfate, and ferric−oxalate−thiosulfate leaching systems have been also developed to eliminate the potential side-effect of ammonia. In this review, the basic theory and process development of some main gold leaching systems based on thiosulfate solutions were systematically summarized to illustrate the research status on thiosulfate leaching process. The potential effects of various additives such as organic ligands containing amino, carboxyl or hydroxy functional groups on gold thiosulfate leaching were described in detail. The potential opportunity and challenge for promoting the industrial development of thiosulfate-based gold leaching systems were also discussed.     

锌粉置换回收锑精矿碱浸液中的金

锑精矿碱浸液是湿法处理锑精矿产生的中间产物含有少量的金,必须回收。以山东某公司锑精矿碱浸液为原料,经多种提取剂对比,采用锌粉置换回收其中的金。考察了锌粉用量、料液pH、浸出温度、时间的影响,得到的最佳工艺条件为:锌粉用量4.0 kg/m³,溶液pH=11,反应时间3 h,反应温度80 ℃,多批次试验金回收率88%。工艺过程简单,经济性可行,有效解决了资源浪费问题,为锑精矿碱浸液回收金提供了一条新的工艺。     

Applications of mixed potential model in leaching of gold

1　ＩＮＴＲＯＤＵＣＴＩＯＮＭｉｘｅｄ ｐｏｔｅｎｔｉａｌｍｏｄｅｌ (ＭＰＭ )ｈａｓｒｅｃｅｉｖｅｄｇｒｅａｔｉｎｔｅｒｅｓｔｉｎｓｔｕｄｙｉｎｇｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｃｏｒｒｏ ｓｉｏｎ[1,2 ] .ＭｉｌｔｏｎａｌｓｏｉｎｔｒｏｄｕｃｅｄＭＰＭｔｏｄｉｓｃｕｓｓｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｄｉｓｓｏｌｕｔｉｏｎｏｆｓｕｃｈｍｉｎｅｒａｌｓａｓｕｒａｎｉ ｕｍｄｉｏｘｉｄｅａｎｄｃｈａｌｃｏｐｙｒｉｔｅ[3] .Ｓｉｎｃｅｇｏｌｄｄｉｓｓｏｌｕｔｉｏｎｉｎｌｉｇａｎｄｓｏｌｕｔｉｏｎｓｉｓａｌｓｏ…