某难氰化金精矿氧化预处理试验研究

某金精矿由于金矿物嵌布粒度微细且多被硫化矿物包裹而造成氰化浸出困难。为此,以过氧化氢为氧化剂,对该金精矿进行了氧化预处理试验研究,并确定了合适的氧化预处理条件为磨矿细度-48μm占90%、矿浆浓度40 g/L、搅拌速度200 r/min、反应温度50℃、硫酸用量0.7 mol/L、过氧化氢用量0.3 mol/L、反应时间8 h。金精矿经氧化预处理后,氰化浸出的金浸出率从51.6%提高到了78.3%,效果显著。

氰化物添加系统的改造及效果

某矿山氰化厂对金精矿氰化浸出加氰化物系统进行自动化改造后,实现了浸出过程中氰化物的添加均衡稳定,氰化物浓度控制在要求值,优化了金氰化浸出指标,降低了氰化物消耗,实现了氰化物无泄露输送,安全环保。

含铝金矿氰化浸出的研究

本文以全泥氰化和浮选精矿氰化的试验为依据,探讨了长石、云母等含铝矿物对氰化提金的影响。

某金矿山硫精矿再磨再浸提金工艺活性炭吸附性能研究

某金矿山采用了浮选回收金、银、铜-硫精矿再磨再浸炭浆法提回收金工艺,随着生产时间的延长,吸附率出现了逐步下降的问题,导致硫精矿氰化浸出工艺中金的回收率大幅降低,本文针通过试验并结合生产实践,对活性炭吸附性能进行探究。

多金属含金矿石综合回收试验研究

对内蒙古某矿多金属含金矿石进行了综合回收试验研究。根据矿石性质,通过流程对比试验,采用原矿重选—重尾混合浮选—混合精矿氰化—氰渣浮选工艺流程,可实现就地产金、银,获得合格的铜精矿、铅精矿、锌精矿,金、银、铜、铅、锌、硫回收率分别为88.81%、93.38%、75.23%、55.36%、65.12%、83.83%。

含氰废水处理及循环使用经验

含铜金精矿氰化后的贫液 ,总氰和杂质离子含量不断升高 ,原设计流程使用乙硫胺脂萃取回收氰化物。运行一年多来指标不稳定 ,工作条件差 ,后改为酸化法回收并且滤液全部返回循环使用 ,不但回收铜等金属与氰化钠 ,保持循环的整个体系杂质元素的水平 。

甘肃某低品位金矿石综合回收有价矿物的试验研究

为了提高甘肃某金矿选矿回收率，采用浮选＋精矿氰化法与全泥氰化法2种工艺方案进行矿石处理，通过对比二者选冶总体回收率，从技术及经济方面综合考虑，最终确定采用先浮选后精矿氰化方法处理金矿石。试验表明，在保证总浮选时间为20 min的前提下，设定生产现场的浮选条件为矿浆浓度33%，磨矿细度-200目占55%以上，丁基黄药100 g/t，丁铵黑药80 g/t。精矿氰化条件应保持在细度-400目占90%以上，氰化物浓度为6.5‰，氰化时间为36 h，浸出矿浆浓度为30%~35%的氰化浸出条件下，可取得氰化总体回收率为95.43%的较好指标。

Fe extraction from high-silicon and aluminum cyanide tailings by pretreatment of water leaching before magnetic separation

Pretreatment of high content of Si- and Al-containing cyanide tailings by water leaching to remove some impurities, such as the major impurities minerals of Si and A1, as well as its effect on Fe extraction in the water leaching process was investigated. The effects of different parameters on iron recovery were studied, and the reaction parameters were proposed as follows： sodium carbonate content of 30%, water leaching at 60 ~C for 5 min, liquid/solid ratio of 15：1, and exciting current of 2 A. Under these optimal conditions, magnetic concentrate containing 59.11% total iron and a total iron recovery rate of 76.12% was obtained. In addition, the microstructure and phase transformation of the process of water leaching were studied by X-ray powder diffraction technique （XRD）, Electronic image of backscattering （BEI）, X-ray fluorescence （XRF）, and energy dispersive spectrometry （EDS）. The results indicate that the soluble compound impurities generated in the roasting process are washed out, and the dissoluble substances enter into nonmagnetic materials by water leaching, realizing the effective separation of impurities and Fe.

某石英脉型微细粒嵌布低品位金矿石选矿试验

为了给某石英脉型微细粒嵌布低品位金矿石的开发利用提供依据,根据矿石性质,采用浮选—浮选尾矿氰化浸出—浮选精矿焙烧后氰化浸出工艺流程进行了选矿试验。结果表明:浮选—尾矿氰化浸出可获得金品位为61.88 g/t、砷含量为4.21%、金回收率为77.57%的金精矿和作业金浸出率为75.85%、对原矿金回收率为17.02%的尾矿浸出液,两者的金回收率合计达到94.59%。金精矿经焙烧预处理,焙砂砷含量降到0.38%、金品位提高到88.40 g/t;焙砂氰化浸出的作业金浸出率达93.28%、对原矿金回收率为72.36%,金精矿焙砂和浮选尾矿氰化浸出的综合金回收率为89.38%。

乌干达某金矿选矿试验研究

东非乌干达Busia金矿为中等硫化物石英脉型含金矿石,矿石中金属硫化物占6.71%,以黄铁矿为主,金属氧化物占1.63%,主要为磁铁矿、赤铁矿及褐铁矿;通过“重选—浮选”、“重选—全泥氰化”和“重选—浮选—浮选精矿氰化”三种工艺流程的对比,最终确定采用“重选—全泥氰化”工艺来回收金。在磨矿细度为-0.045mm占80%,氰化时间为24h的条件下,采用“重选—全泥氰化”工艺流程可以获得精矿金回收率为92.23%;而在再磨细度为-0.0385 mm占85%,氰化时间48h,采用“重选—浮选—浮选精矿氰化”工艺流程可以获得得到精矿浸出率为90.07%,金回收率为85.02%。

夹皮沟金矿选矿工艺改造的比选

针对夹皮沟金矿选厂目前全泥氰化炭浆提金生产工艺产生的氰化尾渣和含氰废水处理污泥危害性大、经济效益低的问题,通过比较分析全泥氰化—无害化处理、浮选、重选—浮选、重选—浮选—金精矿氰化4种工艺的优缺点,从金回收率、投资费用、技术可靠性、安全环保等方面考虑,推荐采用全泥氰化—无害化处理和重选—浮选—金精矿氰化两种工艺作为原工艺改造的方向,并应结合实际进行优化。

某金矿选矿工艺试验研究

对某金矿矿石进行了全泥氰化、浮选—精矿氰化选矿工艺试验研究,根据试验分析结果推荐全泥氰化为该矿石处理工艺,并通过经济技术比较确定了合适的氰化指标。

多管组气混槽的改进设计

气体搅拌槽常用于黄金选冶行业金精矿氰化厂的浸出工艺,因其结构简单,维护便捷,气体作用混合均匀,有利于金精矿的浸出等特点,常常做为浸出工段的主要设备替代机械搅拌型浸出槽。某金精矿氰化选厂计划选购一批大型平底气体搅拌槽,结构与以往气体浸出槽差异较大。通过对常规多管组气混槽的改进设计、取样试验及结果分析,槽内矿物、药剂及载金碳混合均匀,得到了良好的工艺指标。槽体拥有更大的作业容积,并取得了较好的作业效果。

小型金选厂提金工艺流程初探

本文从小型金选厂采用混汞—浮选—精矿氰化提金工艺流程存在的问题着手,分析并通过实践,提出了在设计中尽量避免这些问题的途径,并论述了小型金选厂优先采用的提金工艺流程。

Differences of cyanide leaching between calcine and dust from refractory gold concentrates

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.

含金多金属混合矿选矿方法研究

通过对洋鸡山含金多金属混合矿选矿方法研究，证实优先浮选—硫精矿焙烧氰化—尾矿全泥氰化的工艺流程较为优越。