共查询到19条相似文献,搜索用时 109 毫秒
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《稀土》2015,(5)
研究了四川稀土矿与包头稀土矿硫酸焙烧的最佳工艺技术条件,考察了焙烧温度、焙烧时间、矿酸比以及四川稀土矿和包头稀土矿的配比等对稀土收率的影响,通过正交试验最终获得最优化的工艺参数:焙烧温度350℃,焙烧时间125 min,混合稀土矿和浓硫酸的重量比1∶2.0,四川矿与包头矿的重量比为3∶1,稀土收率达96%以上。同时确定了影响REO浸出率的因素由大到小分别为焙烧温度、四川矿与包头矿的配比、焙烧时间、矿酸比,此工艺重现性良好,水浸液REO含量为34 g/L,PO3-4的含量为0.0038 g/L,Fe2O3的含量为0.015 g/L,Th O2的含量0.001 g/L,均达到质量要求。 相似文献
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针对我国主要的稀土矿物氟碳铈稀土矿目前在分解回收中主要采用浓硫酸焙烧法产生氟化氢污染环境的问题,清华大学核能与新能源研究院从1998年以来开展了氧化镁固氟、氯化铵选择性氯化提取氟碳铈中稀土及其动力学的研究。选择我国典型的稀土矿物包头混合型稀土矿及山东氟碳铈稀土矿展开研究,确定了适宜的工艺条件、氯化选择性和氟的转化形态。稀土以氯化稀土形式被浸取,对于两种稀土矿物稀土浸出回收率均在85%以上。氯化铵氯化稀土的氯化动力学符合Bagdasarym提出的多相区域反应动力学模型,氯化反应的速率αRE遵从Erofeev方程。氯化铵氯化不同形态氧化稀土氯化反应表观活化能的大小顺序为:EaLa2O3+CeO2相似文献
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青海德尔尼铁帽矿和高硫半氧化矿较难分选,研究了采用焙烧—酸浸—氰化浸出工艺从中回收铜、金、铁。结果表明:在m(氧化矿)∶m(高硫半氧化矿)=1∶1、矿石粒度-75μm占81.5%、焙烧温度580℃、焙烧时间2h条件下对混合矿石进行焙烧,然后在液固体积质量比2∶1、体系初始酸质量浓度45g/L、浸出时间1h条件下从焙砂中浸出铜,铜浸出率达88.26%;对酸浸渣,用初始质量浓度2g/L的氰化钠溶液滚瓶浸出24h,金浸出率达85.43%,同时获得铁精矿。该研究为类似复杂氧化矿和半氧化矿的开发利用提供了新思路。 相似文献
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石煤提钒研究进展与五氧化二钒的市场状况 总被引:60,自引:0,他引:60
介绍了石煤提钒传统工艺的改进以及酸法-萃取、无盐焙烧-酸浸-萃取、氧化焙烧-碱浸等几种从石煤无污染提取五氧化二钒的工艺流程,上述工艺不但生产过程无环境污染,钒的回收率还大有提高,是很有前途的清洁生产工艺。同时对近两年国际钒价暴涨暴跌的原因进行了探讨,在分析国内主要钒生产厂家的扩产情况下,指出今后儿年五氧化二钒价格有望保持在7万元/t以上。 相似文献
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Miao Guangli 《中国稀土学报(英文版)》2004,22(Z1)
Some processes of sulfating roasting and water leaching of crude Mianning RE concentrate ore, of fine Mianning RE concentrate ore, of Baotou RE concentrate ore and of their mixture were investigated.The result shows that the mixture of Mianning and Baotou RE concentrate ore has the optimum leaching rate and rate of recovery when the mixture ratio is 1:4.The recovery rate of the mixture is higher by 14.76% than that of crude Mianning RE concentrate ore, by 5.0 % than that of Mianning fine RE concentrate ore and by 2.4 % than that of Baotou RE concentrate ore. 相似文献
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The precipitation of the water-leaching solution of Baotou mixed rare earth(RE) concentrate roasted with sulfuric acid using ammonium bicarbonate for producing RE carbonate produces a mass of ammonia-nitrogen wastewater because of the relatively low solubility of rare earth sulfate.To solve the serious problem of ammonia-nitrogen pollution,new precipitators need to be developed urgently so as to meet the requirements of environmental protection and impurities content of the product(SO_4~(2-)1.8 wt% in RE carbonates products).In this paper,we studied the effects of feeding modes on the behavior of SO_4~(2-) during the preparation of light RE carbonate(RE=La,Ce,Pr,Nd) from their sulfate solutions using Mg(HCO_3)_2 as a precipitant.The results indicate that the contents of SO_4~(2+) in the La and Ce precipitates using positive feeding mode exceed 16 wt% because of the formation of La2(CO_3)_(2.15)(-SO_4)_(0.85)·4 H_2 O and Ce2(CO_3)_(2.15)(SO_4)_(0.85)·3 H_2 O,while those of the Pr and Nd precipitates are 4 wt%-5 wt%since they exist in the form of n-carbonate.The precipitates prepared using synchronous feeding mode are all RE carbonate with only 4 wt%-5 wt% of SO_4~(2-) enclosed in the precipitation.The content of SO_4~(2-) in the RE carbonate obtained using reverse feeding mode is the lowest.Among them,the content of SO_4~(2-) in La precipitate is only 1.40 wt%.Both synchronous and reverse feeding modes can effectively reduce the content of SO_4~(2-)in RE carbonate,which provides theoretical guidance for the preparation of qualified light RE carbonate products by Mg(HCO_3)_2 precipitation method. 相似文献
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本文就包头30%稀土精矿直接入电弧炉冶炼稀土硅铁合金新工艺的实践,试图从技术上加以分析探讨,以解释这一业已完成的新工艺路线的合理性。 相似文献
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Huang Xiaowei Li Hongwei Xue Xiangxin Zhang Guocheng 《中国稀土学报(英文版)》2006,24(2):154-154
Characteristic and hydrometallurgy processes for Baotou mixed-type rare earth concentrate, bastnasite, and ionic adsorption deposit in China were reviewed. The R & D circumstance and new progresses in extraction and separation of RE element in China were introduced. Moreover, the development trend of RE hydrometallurgy was predicted. The direction and emphasised fields of research and development are also brought forward as: to R & D high efficient green progresses in hydrometallurgy and separation of RE ore, resolve the waste pollution problem of water, slagand gas, reduce the chemical material consumption and improve comprehensive efficiency of resources; to R & D preparation technology for RE compounds with ultra high-purity and special physical property for extending application fields of RE. 相似文献
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Development of Rare Earth Hydrometallurgy Technology in China 总被引:25,自引:8,他引:17
Huang Xiaowei Long Zhiqi Li Hongwei Ying Weijuan Zhang Guocheng Xue Xiangxin 《中国稀土学报(英文版)》2005,23(1):1-4
A whole industral system for mining, dressing,smelting, separation of RE has been established inChina. The RE industrialization level and productquality have been developed speedily. The yield of REproducts in China makes up more than 9… 相似文献