锌Ⅱ系统钴开路设计工艺的研讨

锌Ⅱ系统投产以来，曾一度出现系统中钴的严重闭路。中上清含钴由投产初期８ｍｌ／Ｌ左右，猛增至２０ｍｌ／Ｌ，给净液工序造成了极大的压力，危及了整个锌Ⅱ系统的生产，通过对现场生产数据的整归归纳，分析了造成系统中钴严重闭路的原因，就然的开路问题，对设计工艺提出了改进意见。     

逆锑净化工艺中钴的闭路循环和对策

逆锑净化工艺在各湿法炼锌厂硫酸锌溶液的净化过程中被广泛采用，但目前逆锑净化工艺硫酸锌溶液系统中钴的闭路循环问题普遍困扰着诸厂，本文通过对逆锑净化工艺硫酸锌溶液系统中钴闭路循环的分析，对比不同的对策措施，论述了进行钴开路的必要性；半简要地介绍了某厂在这方面所进行的探索，对如何解决系统钴闭路循环的问题进行了初步的探讨。     

逆锑净化工艺中钴的闭路循环分析和对策

逆锑净化工艺在各湿法炼锌厂硫酸锌溶液的净化过程中被广泛采用。生产中钴的闭路循环问题一直困扰着诸厂。通过对逆锑净化工艺硫酸锌溶液系统中钴闭路循环的分析,对比不同的对策措施,论述了进行钴开路的必要性;简要分析了某,一在这方面所进行的探索,解决了系统钴闭路循环的问题。     

湿法炼锌锑盐锌粉除钴的生产实践

叙述了株冶锌Ⅱ系统锑盐锌粉净化除钴的工艺及基本原理，分析了影响除钴的因素。提出了控制钴复溶与闭路循环的措施。     

逆锑锌粉净化除钴的生产实践

介绍了株冶锌Ⅱ系统逆锑锌粉净化除钴工艺及基本原理，分析了生产过程中影响除钴的因素，并提出了改进的措施，有效地控制了溶液中钴的复溶与闭路循环。     

湿法炼锌锑盐锌粉除钴的生产实践

叙述了株冶锌Ⅱ系统锑盐锌粉净化除钴的工艺及基本原理,分析了影响除钴的因素,提出了控制钴复溶与闭路循环的措施。     

湿法炼锌贫镉液除钴工艺研究

我公司镉回收系统贫镉液含钴在100mg/L以上,此贫镉液返回系统会造成Co的闭路循环,给净化除杂质带来困难,同时增加锌粉单耗,因此必须采取有效的方法对贫镉液中的Co进行处理。本试验对锑盐除钴和β-萘酚除钴进行研究,从实验结果看,两种方法都能将贫镉液中的钴除去,实现Co的开路,β-萘酚除钴效率高于锑盐除钴,除钴率达到7%。     

赞比亚某铜钴硫化矿浮选工艺研究

赞比亚某铜钴硫化矿含铜1.25%、钴0.088%。针对该矿石的工艺矿物学特征,进行了不同药剂种类及用量的条件试验,确定了铜钴混合浮选-铜钴分离的工艺流程。闭路试验获得了含铜31.52%、铜回收率为92.32%、含钴0.232%的铜精矿和含钴2.12%、钴回收率67.56%、含铜1.48%的钴精矿的较好指标。     

某含砷铜钴矿选矿工艺试验研究

某铜矿含铜0.58%,并含有0.0085%的钴,钴主要赋存于毒砂中,属含砷难处理矿石。针对该铜矿的矿石性质特点,试验采用铜钴依次优先浮选工艺回收铜和钴,解决了铜精矿含砷高的问题,获得了合格铜精矿。小型闭路试验可获得铜品位26.03%、含砷0.30%、铜回收率96.19%的铜精矿以及钴品位0.26%、含砷7.45%、钴回收率40.38%的钴精矿。     

刚果(金)高泥铜钴矿选矿工艺研究

针对刚果(金)某高泥铜钴矿进行了选矿工艺研究。研究通过工艺矿物学分析发现该铜钴矿大量的原生矿泥和易产生次生矿泥的矿物的存在是影响该铜钴矿有价金属回收的关键。选矿工艺研究确定了分级棒磨—脱泥—浮选原则工艺流程,全流程闭路试验结果表明,采用推荐工艺处理高泥铜钴矿可获得含铜28.15%、钴1.95%,铜回收率72.99%、钴回收率55.12%的铜钴精矿。     

株冶锌Ⅱ系统高钴矿的处理

文章分析了株洲冶炼集团股份有限公司锌冶炼过程中杂质钴在锌Ⅱ系统的投入、产出平衡，指出系统处理高钴矿时，配料、净化Ⅱ工序钴的过程控制、镉Ⅱ工序钴开路是影响新液含钴的三个主要因素，并提出了相应的解决办法，达到了良好的效果，中性硫酸锌溶液含钴稳定在20～25mg／L，新液含钴达0．5mg／L的水平。     

湿法炼锌过程中钴的分布与控制

阐述了钴在湿法炼锌过程中的走向及钴在各物料中的分布情况，分析了钴在锌系统内部循环的原因，提出了相应的解决措施，并就高钴锌精矿配料情况下生产工艺技术条件的优化及新液钴的控制作了论述。     

转炉渣富钴镍浸出液镍钴分离工艺研究

以某厂镍电解生产净化工序氯气除钴产生的钴渣为氧化剂,除去转炉渣浸出液电积脱铜后液中的钴,实现转炉渣富钴镍浸出液中镍钴分离。结果表明,在钴渣含三价镍与钴量摩尔比为4～5,反应温度70～80℃,反应时间120min,终点pH 4.8～5的条件下,分离富集钴后的二次钴渣镍钴比可降为1～1.5,可用于生产钴产品。除钴后液可直接并入镍电解系统。     

钴资源氨法回收研究进展

钴作为一种重要的战略资源,在合金材料、催化材料和电池材料等方面具有重要作用.在钴的典型湿法回收过程中,氨法浸出相比于酸法浸出,具有浸出液纯净、流程短、成本低等优点,在钴矿物的冶炼和二次资源的回收过程中都具有广泛应用.对近些年国内外钴资源的氨法回收过程进行了系统总结,包括氨浸原理、氨浸过程以及氨浸液中钴的回收.在氨浸过程...     

DENSIFICATION PROCESSES IN THE TUNGSTEN CARBIDE-COBALT SYSTEM

Abstract

The tungsten carbide-cobalt system is one in which the carbide matrix phase is to some extent soluble in the cobalt binder and which readily sinters to give 100% density. The characteristics of this system have been examined by determination of densification curves and metallographic examination and compared with a previous investigation on the behaviour of the insoluble tungsten carbide-copper system.

It is found that the good densification characteristics of tungsten carbide-cobalt are due to the initial solution of the carbide by the cobalt. The cobalt diffuses in the solid state into interfaces between carbide particles and as the temperature increases dissolves carbide from the adjacent particle surfaces. Forces arising from minimization of surface energy then act to bring about close packing of the carbide. By this means 100% density is achieved with 8 wt.-%, or more, of cobalt. With between 5 and 8 wt.-% cobalt 100% density is obtained by initial solution followed by a few minutes further sintering during which a solution/reprecipitation mechanism is operative.

If sintering is prolonged, a rigid carbide network is formed and this then determines the contraction of the compact on cooling. Even when 100% density is attained at sintering temperature the cobalt contracts on solidification and cannot fill the intervening space between the carbide particles, so that shrinkage-pipe-porosity forms.

Porosity seals off from the surrounding atmosphere when ～90% density has been reached. If the gas entrapped is insoluble, then the pores shrink until the balance is attained between the surface energy and the excess pressure in the pores and this results in a porosity level of the order of 0·2%     

砷烟灰浸出液的制备及用于砷盐净化除钴试验研究

以某厂砷烟灰为原料,开展了砷烟灰浸出液的制备试验,然后以制备得到的砷烟灰浸出液作砷盐净化除钴的活化剂,开展了净化除钴条件、净化除钴综合条件及三氧化二砷作活化剂净化除钴对比和除钴优化条件等一系列试验研究。试验结果表明:采用砷烟灰制备砷烟灰浸出液及浸出液用于砷盐净化除钴工艺是切实可行的,不仅砷烟灰中的砷得到利用,同时,砷烟灰中铅、银、锑等有价金属与砷得以有效分离。     

电锌冶炼贫镉液除钴研究进展

论述了湿法炼锌常规流程贫镉液的产生及其特点。介绍了当前处理贫镉液的技术方法,重点阐述了氧化水解法沉钴的工艺情况,尤其是Caro酸氧化水解沉淀钴的优势。高锰酸钾氧化水解沉淀钴时,氧化剂的量和反应体系的pH值对过程的影响最为关键。利用过氧化氢和浓硫酸制备出氧化能力较强的卡洛酸来氧化水解沉淀钴,不仅技术上可行,而且过程不引入新的杂质,是一种环境友好型的净化除钴添加剂。料液中98%～99%的钴都将以Co（OH）3的形式沉淀下来,并且沉淀物含钴品位高达49.3%,具有巨大的市场价值。     

Sorption extraction of cobalt ions from nitrate media by the iminodiacetate chelating resins Lewatit TR-207 and TR-260

Cobalt-ion sorption from nitrate media by the macroporous chelating resins Lewatit TR-207 and TR-260, which contain active functional groups based on iminodiacetic acid, is studied. Both resins are shown to sorb cobalt from nitrate solutions rather efficiently at pH 1.5–2.0, and the degree of cobalt extraction reaches ～100% for a solid to liquid ratio of ≥0.3. Under optimal conditions, the cobalt capacity of the resins is ～160 mg/g. The system under study is equilibrated within 240 min, and >70% Co is extracted during the first hour of sorption. On heating to 40–40°C, cobalt sorption enhances; however, upon further heating to 50–52°C, the extraction of cobalt decreases, which is probably caused by thermal destruction of the resin. The estimated change in the enthalpy of cobalt sorption in the temperature range 21–41°C is about +84 kJ/mol. The results obtained are employed to test the cobalt sorption under dynamic conditions in a laboratory column packed with Lewatit TR-207 resin in the H⁺ form (the working volume of the column is 100 ml) using the real mother liquor (24.5 mg Co/l) of cobalt oxalate precipitation. Quantitative desorption of cobalt is conducted with a solution of HNO₃ (400 g/l). During dynamic tests, about nine specific volumes of the initial mother liquor are passed through the column. After this, the cobalt content in the purified solution is lower than 0.4–0.5 mg/l; i.e., the total degree of cobalt extraction is >98%. In the desorption solution, the cobalt concentration increases to ～0.3 g/l, which corresponds to a more than tenfold degree of cobalt enrichment. Thus, the resins under study can be recommended for the extraction of cobalt microamounts (20–50 mg/l) from foul and reused waters.     

湿法炼锌过程中贫镉液除钴的研究

进行了湿法炼锌过程中钴的开路研究,贫镉液用沉钴剂氧化除钴,可使溶液残钴降至5 mg/L以下。     

湿法炼锌过程中贫镉液除钴的研究

进行了湿法炼锌过程中钴的开路研究，贫镉液用沉钴剂氧化除钴，可使溶液残钴降至5mg/L以下。