从硫酸锌溶液中萃取锌的试验研究

研究了用D2EHPA从含锌浸出液中萃取锌.结果表明,以皂化后的体积分数为20%的D2EHPA钠盐作萃取剂,260号溶剂油作稀释剂,在相比(V0/Va)为3∶2,料液初始pH为2.0,搅拌强度200 r/min,萃取时间10 min条件下从锌质量浓度18 g/L的浸出液中萃取锌,静置分层10 min后,锌的单级萃取率达72.81%.用180 g/L硫酸进行反萃取,锌的反萃取率为88.67%,可以实现锌、铁分离.     

浅析硅灰石矿勘查基本分析项目和矿物含量的确定

在硅灰石矿的勘查过程中,如何确定基本分析项目和矿物含量是整个勘查过程最重要的环节,其正确与否将直接影响勘查成果的质量。为此,本文在阐述如何确定硅灰石矿勘查基本分析项目的基础上,借助实例着重解读了利用化学分析结果计算矿物含量工作方法,以供地质工作者在勘查同类型矿床时参考。     

鄂西某鲕状赤铁矿磁化焙烧-磁选-反浮选试验研究

鄂西某鲕状赤铁矿石中的铁品位为43.50％,其主要赋存在赤褐铁矿中,分布率离达96.38％.矿石的脉石以SiO2和Al2O3为主,含量分别为18.68％和6.54％.有害杂质硫、砷的含量低,但磷的含量高达0.91％,属于典型低硫高磷单一酸性鲕状赤铁矿石.工艺矿物学研究表明,赤铁矿颗粒嵌布粒度较细,并与脉石紧密交生,因此试验采用磁化焙烧-弱磁选-细磨脱泥-阴离子反浮选工艺流程进行探索,获得合格铁精矿产率55.95％,全铁品位61.56％,铁回收率78.90％,含磷0.24％.     

高硅低品位氧化锌矿的酸浸动力学

针对高硅天然氧化锌矿常规处理时存在的矿浆难压滤、液固比过小、Zn 浸出回收率低等问题, 试验探讨了酸度、加酸方式、固液比、粒度及温度因素对锌浸出率的影响。结果表明: 固液比1∶6时, 0.15～0.212 mm粒级在常温下与浓度为8%的H₂SO₄反应120 min, 锌的浸出率可达96.07%。升高温度, Zn的浸出率可提高至99.02%。浸出过程可用收缩未反应核模型来解释, 即浸出率与动力学方程1-(1-α)^1/3～ k·t 相吻合。浸出动力学显示反应过程中可通过控制矿物表层的扩散来控制反应过程的速率。活化能是控制扩散过程的特征, 其值约为6.385 kJ/mol。     

氧化锌矿硫化-胺法浮选及浸出研究

文章对广西河池氧化锌矿进行了浮选分离和硫酸浸出试验,初步探讨了该氧化锌矿石的可选性.浮选可获得锌精矿品位24.52%,回收率69.27%.结果表明可回收氧化锌精矿,但由于氧化锌矿石浮选过程中矿泥和可溶性盐的不良影响使得矿石指标不好.试验还研究了氧化锌矿的浸出.在浸出试验过程中主要考察了加酸方式及固液比对锌的浸出率的影响.试验可获得锌的浸出率为80.39%.浸出效果比较好.     

Solvent extraction of zinc from zinc sulfate solution

The extraction of zinc from zinc sulfate solution was investigated, using 20% saponified D2EHPA as an extractant and 260^# sulfonate kerosene as a diluent. The solution was stirred for 8 min at phase ratio (V _o/V _a) of 1.0:1.0, initial pH of 2.0 and stirring speed of 200 r/min. The results show that 75% zinc can be extracted from the zinc sulfate solution when the concentration of zinc is 18.7 g/L after being settled for 10 min. 88.60% zinc can be stripped by 196 g/L sulfuric acid, and zinc ion can be separated from ferric ion.     

Preparation of lead sulfate powder directly from galena concentrates

A new approach to prepare PbSO4 powder is studied. Using the methods of the leaching of galena concentrates in the ferric chloride media, selective purification and chemical sedimentation, PbS concentrate can be converted into PbSO4. The conversion recovery is 97.39%, the purity of PbSO4 powder is above 99% and its average crystallite size is about 42 nm. In this process, emission of lead vapour and SO2 cannot occur. The experimental results demonstrate the feasibility of realizing a green route to prepare the lead sulfate powder.