钽的提取研究进展

钽是一种稀有金属,被视为新兴战略金属,广泛应用于多个领域,特别是在能源、国防、高新科技等领域具有不可替代的作用,并随着应用范围日益扩大,用量大幅度增加。铌和钽在自然界中一般呈类质同象混合物的形式存在,目前从铌钽精矿中提钽是最常见的回收钽资源的方法之一。文章概述了从铌钽精矿中提钽的工艺,主要包括精矿分解工艺和铌钽分离工艺。同时介绍和总结了从废硬质合金、废钽电容器、冶金渣等二次原料中提钽的方法,最后对提钽的发展方向进行了展望。     

Effect of freezing on the viscoelastic behaviour of whey protein concentrate suspensions

The effect of freezing on viscoelastic behaviour of whey protein concentrate (WPC) suspensions was studied. Suspensions with total protein content of 5% and 9% w/v were prepared from a commercial WPC (unheated suspensions). A group of unheated suspensions was treated at two temperatures (72.5 and 77.5 °C) during selected times to obtain 60% of soluble protein aggregates (heat-treated suspensions). Unheated suspensions and heat-treated suspensions were frozen at −25 °C (frozen unheated and frozen heat-treated suspensions). Frequency sweeps (0.01–10 Hz) were performed in the region of linear viscoelasticity at 10, 20, 30, 40, and 50 °C. Mechanical spectra of all studied suspensions at 20 °C were similar to viscoelastic fluids and complex viscosity increased with the frequency (ω). Elastic (G′) and viscous (G″) moduli were modelled using power law equations (G′ = aω^x, G″ = bω^y), using fitted parameters a, x, b, and y for statistical analysis. Exponent y was the most influenced by freezing, indicating the existence of a higher degree of arrangement in frozen unheated suspensions and a lower degree of arrangement in frozen heat-treated suspensions. Only characteristic relaxation times (inverse of the crossover frequency) of suspensions with 5% w/v of total protein content were significantly influenced by freezing. Time–temperature superposition was satisfactory applied in unheated whey protein concentrate suspensions only in the range of high temperatures (30–50 °C). However, this principle failed over the complete temperature range in most of the frozen suspensions. It is possible that freezing produced an increase in the susceptibility to morphological changes with temperature during the rheological measurements.     

硫精矿提硫降杂工业试验研究

为了降低硫精矿中的杂质，提高硫品位，开展了现场工业试验研究．对硫精矿进行两次开路精选，得到高硫矿和低硫矿两个产品，21个班平均指标是：高硫矿产率39．82％、硫品位37．55％、MgO品位0．582％；低硫矿硫品位28．7l％。针对工业试验存在问题，提出了硫精矿再磨增加单体解离度．进行系统稳定试验，探索旋流器分级提硫的改进方案。     

真空缓冷铸渣机冷却炉渣选铜的研究

介绍了真空缓冷炉渣的工艺矿物学特性。试验研究结果表明，该炉渣属于中等可碎性偏难，硬度系数在８￣１６之间，在磨矿细度为－０．０１６ｍｍ占８９％时，粗、扫选抛尾粗精矿再磨再选，以Ｚ－２００、ＳＮ－９和丁胺为混合捕收剂，最终得到铜精矿产率为４．５９％，精矿含铜２３．４８％，含金５．８ｇ／ｔ，铜回收率为８３．７０％；尾矿含铜０．２２％，含金０．１８ｇ／ｔ。     

超声波强化草酸浸出氧化锌精矿

研究超声波强化草酸浸出氧化锌精矿过程，在试验条件下，用超声波辐射浸出氧化锌精矿同机械搅拌相比，浸出率提高32.12%；锌浸出率随辐射时间延长而提高；超声波辐射强度提高，辐射时间一定时，浸出率提高，浸出率相同时，浸出时间缩短，液固比小，浸出率低，但液固比过大，会给后续工序带来困难。     

药剂预处理金精矿氰化工艺研究与实践

对河台金矿金精矿氰化工艺,通过采用药剂X预处理的方法,提高了氰化浸出速度,优化了相关作业条件,增加了氰化处理能力。同时该法使用后,降低了材料消耗与处理成本,提高企业经济效益。     

某铜铁矿选矿厂铁精矿降硫试验研究

通过对含硫铁精矿的试验研究分析结果表明,直接用该厂现有的工艺流程对铁精矿进行降硫是不可能达到所要求的质量标准的,其主要是受到磁黄铁矿的影响,本文详细分析了该铁精矿难降硫的原因,并且认为要想获得合格产品,选矿厂必须对现有工艺流程进行改造。     

难选铅锌矿选矿工艺改造实践

文章介绍了原矿矿石性质和过去的生产情况,重点论证了流程改造的必要性和可选性。进行了将两种不同性质的矿石分开处理和直接生产混合精矿技术方案,降低了生产成本619．8元／t金属量,提高了企业的经济效益。     

某钒钛磁铁精矿深度还原-磁选试验研究

以河北承德某铁品位为61.08%,TiO2品位为7.66%的钒钛磁铁精矿为研究对象,进行了钒钛磁铁精矿深度还原-磁选试验研究。考察了还原温度、还原时间、C/O摩尔比、CaCO3添加量对还原产物和分选指标的影响。在还原温度为1350℃、还原时间120min、C/O摩尔比2.5、CaCO3添加量为16%、磁选场强为85mT的条件下,可以得到全铁品位为87.19%、铁回收率为82.62%的磁性产品和TiO2品位18.76%、TiO2回收率为79.40%非磁性产品。由还原产物的金属化率与XRD分析得知,钛磁铁矿向铁氧化物、钛氧化物和金属铁的转化较难发生,适当增加CaCO3的用量,能促进钛磁铁矿向CaTiO3、铁氧化物和金属铁的转化。      

某钒钛磁铁矿尾矿资源化利用

承德市某钒钛磁铁矿尾矿钛含量较高,潜在回收价值可观。采用化学分析、XRD衍射分析、粒度分析、矿物解离分析仪(MLA)等手段研究了该尾矿的矿物学特性及钛的赋存状态。在工艺矿物学研究基础上,通过试验研究确立了重选短流程回收钛、选钛尾矿差异化分级利用的综合利用技术工艺,获得含TiO234.60%、回收率53.43%的钛铁矿精矿以及产率66.22%的建筑用商品砂,实现了铁尾矿的资源化综合回收利用,有助于矿山与社会环境和谐发展。