锌阳极泥—硫化锌精矿中锰锌分离的焙烧参数研究

通过锌阳极泥与硫化锌混合焙烧—热水浸出工艺对锌阳极泥中的锰进行了提取,研究了焙烧气氛、物料配比、焙烧温度、焙烧时间等对锰提取率的影响。结果表明：锌阳极泥与硫化锌精矿质量比1∶1.5,焙烧温度760℃,焙烧时间2 h,浸出温度80℃,浸出时间2 h,液固比5∶1,锰的浸出率在80%以上。     

在高电流效率下同时电积MnO_2和锌

绪言锰常与闪锌矿浮选精矿伴生。如果铁也存在,则精矿焙烧时铁就与锌和锰结合成铁酸盐。在所谓焙烧—浸出法中(Cntterill和Cigan,1970),没有成铁酸盐的锌和锰首先溶解在中性浸出液中,而大部分残留在中性浸出渣中的锌和锰的铁酸盐则在随后的热酸浸出时被溶解。如果将精矿用新的加压氧浸法直接浸出(Verbaan 1979,Doyle等,1979)则能获得高的锌和锰提取率。因此,浮选精矿中     

盐酸介质中制取化学二氧化锰与活性氧化锌的研究

报道了以软锰矿和锌精矿为原料,在盐酸介质中同槽浸出与除铁、溶液净化、锌锰分离、提取化学二氧化锰与活性氧化锌的新工艺。在适宜的工艺条件下,可以取得较好的技术指标。     

从难处理硫化银物料中提取银新工艺研究

研究了硫氰酸铵水溶液氧压浸出-铁粉置换法从湿法炼锌热酸浸出渣浮选银精矿、硫化锰银矿脱锰后渣中提银新工艺。试验结果表明,浮选银精矿与脱锰渣的银浸出率分别为大于95%与接近88%。     

贫锰矿和锌精矿同时浸出工艺研究

研究了贫锰矿与锌精矿同时浸出及以硫磺形式回收硫.通过试验,得到贫锰矿浸出锌精矿的最佳工艺条件为:始酸质量浓度150 g/L,温度90～95 ℃,液固体积质量比7∶1,贫锰矿过量1.5倍,硫酸过量1.5倍,浸出时间4 h.在此条件下,锰的一次浸出率为85.2%,锌浸出率为83.0%.     

甘蔗渣提取木质素作为硫化锌精矿氧压浸出分散剂的应用研究

针对采用硫化锌精矿氧压浸出工艺的炼锌企业采购木质素比较困难,木质素含氯元素较高且其含的有机物在使用过程中难于分解的问题,通过实验研究对比甘蔗渣提取木质素和市场采购木质素在硫化锌精矿氧压浸出的分散效果,从浸出液成份、锌浸出率、浸出渣性状进行综合分析对比。结果表明：甘蔗渣提取木质素具备作为硫化锌精矿氧压浸出分散剂使用的各项特性,浸出液含有机物、氯离子明显下降。     

高铟高铁闪锌矿加压酸浸工艺研究

介绍高铟高铁闪锌矿精矿加压酸浸提取锌铟试验研究情况,重点考察精矿粒度、硫酸用量、时间、氧气分压力对铟、铁浸出率的影响。结果表明,采用二段加压浸出,既可以保证高的锌、铟浸出率,又能够实现锌、铟与铁的选择性浸出,降低浸出液的酸度。     

从锌电积阳极泥中回收锌和锰的试验研究

研究了采用水洗和还原浸出法从锌电积阳极泥中提取锌和锰,考察了洗涤温度、洗涤时间、洗涤方式及还原浸出时间、浸出温度、pH等对锌、锰回收率的影响。试验结果表明:洗锌过程中,温度对洗锌率影响较大;在液固体积质量比3∶1、温度80℃条件下,通过逆流洗涤,洗锌率达97%以上,渣中锌质量分数在0.07%~0.09%之间。用SO2作还原剂浸出锰,pH和SO2气体流量对锰浸出率影响不明显;60℃下,锰浸出率在99%以上。通过水洗和还原浸出,锌电积阳极泥中的锌和锰得到有效回收,且流程简单。     

湿法炼锌浸出渣与锌精矿联合浸出工艺研究

开展湿法炼锌浸出渣和锌精矿联合酸浸试验,利用硫酸浸出湿法炼锌常规浸出渣中以铁酸锌等方式存在的锌,同时采用高铁锌精矿将浸出液中的三价铁离子还原为二价铁离子,实现锌精矿中锌的同步浸出。探讨锌浸出渣和锌精矿投料比、初始硫酸浓度、反应时间、液固体积质量比和浸出温度对锌及伴生金属铜、铟和杂质金属铁浸出率的影响。结果表明,在浸出终点浸出液中硫酸浓度20～40g/L、锌浸出渣与锌精矿质量比1∶0.25、原料粒度-0.074mm、液固体积质量比6mL/g、反应温度90℃、反应时间3h的条件下,锌、铟、铜的浸出率都在96%以上,浸出液中95%以上的铁被还原为二价铁离子,满足后续工艺的要求。     

锌渣热酸浸出氧化除鉄流程試騐

锌生产的原料主要是闪锌矿,由于铁与锌系类质同晶,尽管经过浮选分离,一般精矿含铁仍有10%左右,此种精矿经焙烧后由于难溶铁酸锌的形成影响到锌的有限提取(一般83—93%)。我厂焙砂浸出过程中锌及其它有价金     

硫化锌精矿加压氧浸工艺的酸平衡分析

硫化锌精矿加压氧浸工艺的酸平衡除了与精矿中耗酸组分有关外,还与浸出条件以及中和剂的选择有关。控制浸出条件和选择合适的沉铁中和剂有助于维护整个生产系统的动态酸平衡。     

硫化锌精矿还原浸出高浸渣中锗的研究

湿法炼锌产出的高浸渣含锗达150～300g/t,采用两段逆流硫化锌精矿还原浸出,锗的浸出率可达65%以上。并提出了还原浸出的工艺流程和优化浸出条件。     

Agglomeration of particles during roasting of zinc sulfide concentrates

This study was undertaken in an attempt to explain the agglomeration of zinc concentrate particles that occurs during fluid bed roasting. In order to simulate extensive particle contact, pure ZnS, FeS, and (Zn, Fe)S particles were roasted in a fixed bed at temperatures between 1223 K and 1323 K using an argon-oxygen gas mixture withP _O2 = 0.21 atm. The results were compared to the reaction products and morphology of an agglomerated commercial concentrate. The reactants were contained in MgO crucibles suspended in a thermobalance and the weight change was recorded as the reaction proceeds. The resulting data were used to identify the specific reaction that takes place for each of the reactants. Products were identified by X-ray diffraction analysis. The morphology of the products was analyzed using SEM and confirmed that the formation of a liquid phase composed of a solution of Fe-S-O causes particles to stick to each other, thus causing agglomeration. This phenomenon was observed for both the FeS and (Zn, Fe)S samples but not for the ZnS. The morphology and the X-ray diffraction pattern of the reaction products of the synthetically prepared (Zn, Fe)S showed remarkable similarity to that of the roasted industrial concentrate.     

大吉山钨矿钼铋无氰浮选分离回收的试验研究

对江西大吉山钨业有限公司钨精矿脱硫后硫化矿进行了钼、铋无氰浮选分离回收的试验研究。针对该硫化矿性质,进行了抑制剂种类和用量、捕收剂用量等比较试验,采用了优先浮粗钼精矿一粗钼精矿精选一浮粗钼精矿的尾矿再浮铋的优先浮选工艺流程,使用非氰组合抑制剂Na2CO3、ZnSO4、Na2S取代氰化物进行了钼铋无氰浮选分离,试验具有明显的环境效益,并获得了与矿山传统的有氰选矿工艺相近的选矿指标：钼精矿含钼39．13％、钼回收率55．63％,铋精矿含铋15121％、铋回收率80．87％。     

The anodic dissolution of ZnS electrodes in sulfuric acid solutions

The anodic dissolution of reagent grade ZnS and ZnS concentrate has been studied. The majority of the research was conducted in H₂SO₄ although a limited number of tests were made in HCl and KOH. Polarization studies showed that both Zn²⁺ and S were products in the acidic solutions. ZnS passivated in KOH solutions. The electrodes were fabricated by hand pressing mixtures of ZnS + pitch (5–15%) and sintering at 800°C in a N₂ atmosphere. The open circuit potentials were considered to be mixed potentials resulting from the anodic dissolution of ZnS and cathodic reduction of S or O₂. Current efficiencies and $\text{Zn}{}^{\mathrm{2+}}\text{S}$ ratios were determined at 0.5 and 0.85 V vs. SHE. The results indicated the occurrence of both electrochemical and chemical dissolution steps as well as the further oxidation of H₂S, namely,

$\text{ZnS(s)=Zn}{}^{\mathrm{2+}}\text{(aq)+S(s)+2e}$

$\text{ZnS(s)=2H}{}^{\mathrm{+}}\text{(aq)=Zn}{}^{\mathrm{2+}}\text{(aq)+H}{}_2\text{S(aq)}$

$\text{H}{}_2\text{S(aq)+4 H}{}_2\text{O(I)=HSO}{}_4\text{(aq)+9H}{}^{\mathrm{+}}\text{(aq)+8e}$

The overall dissolution appears to be mass transfer-limited, probably either by the diffusion of Zn²⁺ from the reaction interface, through the reacted layer to the bulk solution, or the dissolution of precipitated Zn(OH)₂ in the reacted layer by the diffusion of H⁺ into the layer. The concentrate anodes polarized more drastically than the reagent grade ZnS anodes, possibly due to the presence of PbS impurity which would form PbSO₄ in the anode pores.     

The effect of microwave irradiations on the leaching of zinc from bulk sulphide concentrates produced from Rampura–Agucha tailings

This work reports the effect of microwave irradiation on extraction of zinc from a bulk sphalerite (ZnS)/pyrrhotite (FeS) concentrate produced by flotation of tailings from the Rampura Agucha Lead–Zinc mines in India. This material could not be treated economically by conventional hydrometallurgy or pyrometallurgical methods due to low zinc concentration. Consequently, microwave assisted leaching was tested. Zinc leaching in sulphuric acid was rapid with > 90% dissolution after 6 min, further irradiation increased the zinc to 96% after 16 min. Iron dissolution increased up to 12 min irradiation and then decreased due to precipitation. Power consumption for > 90% Zn recovery was 0.36 kWh/kg concentrate. The leach solution contained 50–55 g/L zinc and 18–20 g/L iron which could be reduced to 0.54 g/L by jarosite precipitation. The ratio of Zn/Fe leached was 3.4 compared with the ratio of 0.6 for the concentrate showing significant selectivity for zinc over iron using this method.     

ZnS/Ni_2P复合物的合成、表征及光催化性能

以ZnS微球作为前驱体,乙酸镍为镍源,白磷为磷源,采用水热法制备ZnS/Ni_2P复合物。通过XRD,FE-SEM和TEM表征得知,ZnS/Ni_2P复合物由立方相的ZnS微球和复合于微球表面的六方相Ni_2P颗粒组成,且ZnS微球由ZnS纳米颗粒组成。光催化降解染料实验测试结果显示,ZnS/Ni_2P复合物与单一的ZnS相比,催化性能得到显著改善。同时,探究了不同的ZnS与Ni_2P质量比对复合物性能的影响,结果表明Ni_2P与ZnS的相对复合比例太大或太小都会对复合物性能的提升产生不良影响,最佳ZnS:Ni_2P的质量比为4:1。     

Transparent Polycrystalline ZnS and ZnSe Growth by CVT Method

ZnS and ZnSe are important infrared windows materials, which are grown by CVD method traditionally. Comparing with CVD method, the device of CVT (chemical vapor transport) method is much simpler. Transparent polycrystalline ZnS and ZnSe were grown by CVT method successfully. The grown ZnS and ZnSe shows that their transparencies exceed 40% in infrared region. After HIP treatment, the transmittance of as-grown CVT ZnS is improved greatly, which is better than 60%. The defects which effect transparency were studied.     

A Novel Structure of ZnS：Tm^3＋ TFEL Device

A novel ZnS :TmF3 TFEL device with the structure of ITO/SiO2/ZnS : TmF3/SiO2/ZnS : TmF3/SiO2/Al was prepared by e-beam evaporation method. The EL emission spectra show that the brightness of the novel structure devices greatly increases compared with that of devices with traditional double insulator structure, and the ratio of blue emission to red emission of the novel structure device is also improved. The improvement of the EL characteristics of this kind TFEL device is attributed to both of the electron acceleration and the ZnS/SiO2 interface.     

纤锌矿ZnS在油-水界面处的室温制备及光催化性能

通过控制硫化锌室温成核反应在油-水液-液界面处进行,并采用羟基端基自组装分子层修饰的聚合物膜作为柔性衬底,最终在衬底表面制得硫化锌纳米晶膜.X射线衍射表征显示产物为高温稳定的纤锌矿结构.扫描电镜和透射电镜观察发现硫化锌膜由粒径30-50 nm的颗粒构成.产物对甲基橙的光催化降解研究证实在紫外光辅助下硫化锌纳米晶膜对有机物的降解能力.鉴于上述结果,提出了一种结合油-水液-液界面及自组装分子层功能化的衬底,在室温且无添加剂条件下一步制备高温稳定相ZnS功能膜的方法,并分析了产物形貌与光催化性能间的关系.