共查询到20条相似文献,搜索用时 93 毫秒
1.
为获得某铅锌银矿全尾砂浆浓密参数,进行室内静态絮凝沉降试验,观察分析全尾砂絮凝沉降过程中沉降速度、极限浓度和上清液含固率变化。通过正交试验法及对试验数据的数值拟合,探究不同絮凝剂种类、絮凝剂单耗、絮凝剂溶液添加浓度、全尾砂浆浓度对该矿全尾砂絮凝沉降的影响。结果表明:该矿全尾砂砂浆最优浓度为 25.162%,最适宜絮凝剂为 1 200 万分子量 APAM,最佳絮凝剂溶液添加浓度为 1.032‰,最佳絮凝剂单耗为 37.925 g/t。实验为矿山全尾砂膏体制备提供技术参数。 相似文献
2.
为获得某铅锌银矿全尾砂浆浓密参数,进行室内静态絮凝沉降试验,观察分析全尾砂絮凝沉降过程中沉降速度、极限浓度和上清液含固率变化。通过正交试验法及对试验数据的数值拟合,探究不同絮凝剂种类、絮凝剂单耗、絮凝剂溶液添加浓度、全尾砂浆浓度对该矿全尾砂絮凝沉降的影响。结果表明:该矿全尾砂砂浆最优浓度为 25.162%,最适宜絮凝剂为 1 200 万分子量 APAM,最佳絮凝剂溶液添加浓度为 1.032‰,最佳絮凝剂单耗为 37.925 g/t。实验为矿山全尾砂膏体制备提供技术参数。 相似文献
3.
通过野外取样、制备样品、显微镜观察、X射线衍射分析(XRD)、X射线荧光光谱分析(XRF)、电感耦合等离子体质谱法(ICP-MS)分析、电感耦合等离子体原子发射光谱法(ICP-AES)分析、扫描电子显微镜配合能谱分析、电子探针分析等手段,对贵州织金某红土型钛矿中钛元素赋存状态作了系统的研究。该矿石中TiO_2含量在5.02%~8.59%,铝硅比较低,属于红土型钛矿石;钛元素以独立矿物锐钛矿、钛铁矿存在于矿物中;钛元素取代赤铁矿中的铁元素,以类质同象赋存于赤铁矿晶体中;可通过加碱焙烧后加水浸出富集锐钛矿。 相似文献
4.
5.
6.
7.
研究了河北某500 t/d萤石选厂尾矿絮凝沉降特性。用聚合氯化铝(PAC)和聚丙烯酰胺(PAM)复配成复合絮凝剂(PAC+PAM)应用于此尾矿水的处理,完成了聚合氯化铝(PAC)和4种聚丙烯酰胺H101、H102、H103和H104组合药剂的尾矿沉降脱水试验。结果表明,同时添加聚合氯化铝(PAC)与聚丙烯酰胺H102组成的组合药剂较为有效,H102的最佳用量为50 g/t,聚合氯化铝的最佳用量是200 g/t,尾矿中SS含量对沉降效果存在影响,SS含量越低,沉降越快,且药剂用量较少,效果较好。 相似文献
8.
9.
针对印尼某红土镍矿的组成及结构特点,运用还原焙烧—浸出—磁选法综合利用红土镍矿。在配料中使用添加剂硫酸钠和碳酸钠改善还原焙烧性能,并考察了硫酸钠和碳酸钠配比(S/C)、配煤量、焙烧温度以及焙烧时间对镍铁精矿中镍品位以及镍回收率的影响。结果表明,当红土矿、硫酸钠、碳酸钠和煤的质量比为100∶14∶8∶8,焙烧温度为1 200℃以及焙烧时间为80 min时,可以得到品位为4.59%,镍收率为88.58%的镍铁精矿。该工艺流程能够高效富集红土镍矿中的Ni、Fe、Al等有价金属元素,实现了红土镍矿资源的高效综合利用。 相似文献
10.
全尾砂沉降特性决定其在深锥浓密机中的浓密效率,进而影响充填料浆制备及采场充填效率。为保证沙溪铜矿大规模开采的采场充填效率、提升充填料浆连续稳定制备能力,拟对矿山极细全尾砂深锥浓密控制参数进行优化调整,为此开展了矿山全尾砂自然沉降和絮凝沉降对比试验研究,结果表明:矿山全尾砂自然沉降速率无法满足充填生产需要,需添加絮凝剂加速尾砂沉降;考虑絮凝沉降效果及絮凝剂成本,优选天润P-6型絮凝剂更适合本矿山全尾砂;增加絮凝剂的添加量,能有效提高深锥浓密机中全尾砂沉降速率,但同时会显著降低浓密机底流浓度;综合深锥浓密机中的全尾砂浓密效率及底流浓度,优化确定在15%入料浓度下的絮凝剂添加量为30g/t。可为同类矿山新建深锥浓密机沉降参数管控提供方法参考。 相似文献
11.
如今世界经济迅猛发展,金属镍的需求量也在加速增长。人们主要从硫化镍矿和红土镍矿中提炼金属镍。然而硫化镍矿资源因大规模开发而不断减少,红土镍矿未来将成为镍的主要来源。因此研究红土镍矿的高效开发利用,是当今围绕镍资源研究的热点,对实际生产具有重要的现实意义。本文简要介绍了镍的应用、开发红土镍矿的意义、红土镍矿的矿物学特性、红土镍矿世界范围内的储量和分布,并且列举并分析了红土镍矿的各种冶炼工艺及其优点与不足,同时综述了有关红土镍矿研究的新方法,为红土镍矿高附加值综合利用研究提出思路。 相似文献
12.
A series of nickel laterite ores with different calculated amounts of anhydrous sodium sulphate were prepared by physical blending or sodium sulphate solution impregnation. The reduction of the prepared nickel laterite ore by H2 was carried out in a fluidised-bed reactor with provisions for temperature and agitation control, and the magnetic separation of the reduced ore was performed using a Davis tube magnetic separator. The mineralogical properties of the raw laterite ore, reduced ore and magnetic concentrate were characterised using ICP, TG–DSC, N2 adsorption, X-ray diffraction and optical microscopy. The catalytic activity of sodium sulphate was also studied by using Hydrogen temperature-programed reduction. The experimental results indicate that Na2SO4 could overcome the kinetic problems faced by the laterite ore and that it exhibited noticeable catalytic activity only if the temperature reached at least 750 °C. This high temperature accelerated the crystal phase transition of the silicate minerals and increased the utilisation of H2. In comparing the results from the two different methods for adding Na2SO4, the nickel content and recovery of the magnetic concentrate were increased by using the impregnation method rather than the physical blending method and the increasing amount of sodium sulphate assisted in the further beneficiation of nickel. The partial pressure of H2 and the reducing time also affected the reduction process of the iron oxides. The results of the microscopic study indicated that the formation of a Fe–S solid solution, which was derived from the SO2 sulphide reduction of FeO, was conducive to mass transfer and accelerated the coalescence of metallic ferronickel particles. For the nickel laterite ore, under the synergistic effect of sodium sulphate and hydrogen, a nickel content and nickel recovery of 6.38% and 91.07% were obtained, respectively, with high product selectivity. 相似文献
13.
14.
15.
The reduction of nickel from low-grade nickel laterite ore using a solid-state deoxidisation method 总被引:1,自引:0,他引:1
The reduction of nickel from low-grade nickel laterite ore using a solid-state deoxidisation method was studied. The effects of temperature, time, reductant type and CaO content on the conversion percentage of the total nickel to metallic nickel (αNi) in the nickel laterite ore reduction process were investigated. The results showed that αNi was strongly influenced by the reaction temperature in both gas–solid and solid–solid reduction processes, and a higher temperature was more favourable for nickel reduction. Because the reduction mechanism of nickel laterite ore (NiO + CO → CO2 + Ni) is indirect, a higher αNi (>80%) can be obtained by increasing the CO and anthracite content. In the gas–solid reduction process, a longer reaction time favoured nickel reduction, and the conversion percentage decreased when a gaseous reductant was used at 850 °C because of phase transformation. In the solid–solid reduction process, the conversion percentage of the total nickel to metallic nickel first increased and then decreased with increasing reduction time and CaO content. In both reduction processes, taenite was found by XRD in the reduced ore because of iron oxide reduction and metallic nickel formation. SEM revealed that the nickel laterite ore was transformed from large granular and sandwich structures to small granular and flocculent structures during the reduction process. 相似文献
16.
In this study, atmospheric acid leaching behaviour of siliceous goethitic nickel (Ni) laterite ore is investigated. Specifically, the effect of −200 μm feed solid loading (30 vs. 45 wt.%) and temperature (70 vs. 90 °C) on leach kinetics, acid consumption capacity and Ni and cobalt (Co) extraction was studied under isothermal, batch (4 h) leaching conditions at pH 1. Incongruent leaching was observed for constituent elements reflecting slow but steady release of value (Ni and Co) and some of gangue metals such as Fe, Mg and Al accompanied by faster and sharp release of Na and Si. Higher temperature and lower pulp solid loading, both led to a 40–50% increase in overall Ni and/or Co extraction and higher acid consumption. At 70 °C and 45 wt.% solid loading, Ni/Co extraction after 4 h was the lowest (∼14/16%) whilst the highest extraction (∼67/56%) was observed at 90 °C and 30 wt.% solid loading. Temperature appeared to have dramatic influence on Ni/Co and other impurity metals’ extractions revealing the chemical reaction controlled nature of the leaching. Higher solid loading and longer leaching time also both slowed down the leach kinetics. A two-stage chemical reactions-controlled leaching mechanism involving a faster initial leaching kinetics followed by a slower leaching at lower rate constants and higher activation energies was established for release of Ni, Co, Fe and Mg. The mechanism reflects the fast leaching of reactive host mineral phases (e.g., clays and Mg–silicates) during first 30 min followed by slow leaching of more refractory mineral phases (e.g., goethite and quartz) during the rest of leaching period. The findings provide a greater understanding for enhanced atmospheric acid leaching process of siliceous goethitic laterite ores. 相似文献
17.
针对云南省元江红土镍矿的矿物组成特点,在比较国内外红土镍矿处理工艺的基础上,提出了还原—磨矿—选别—氧化浸出工艺处理该矿,并进行了全流程试验。首先进行了还原—磨矿—选别试验研究,主要考察了还原温度、还原时间、添加剂配比和还原剂配比对指标的影响;其次进行了综合试验。试验结果表明,还原—磨矿—选别可以抛弃红土镍矿中80%以上的脉石,同时实现镍钴铁富集,氧压浸出工艺可实现镍钴与铁的分离,并获得铁红产品。通过试验,获得的技术指标为:从原矿至氢氧化镍(钴)段,镍直收率大于75%、钴直收率大于70%和铁直收率大于80%;氢氧化镍产品镍的品位大于31%,氢氧化钴产品钴的品位大于0.70%,铁红产品铁含量大于62%,铁红达到铁精矿要求,可以作为铁精矿出售。该工艺实现了镍钴铁综合回收,资源利用率高,环境友好,为综合回收红土镍矿中镍钴铁提供一条新的工艺技术路线。 相似文献
18.
研究了褐铁矿型红土镍矿硫酸高压浸出过程中浸出温度和时间、硫酸用量对镍、钴、锰、铁、铝、镁、硅、铬浸出的影响。在浸出温度为250℃,浸出压力3.9 MPa,浸出时间为40 min,硫酸用量240kg/t干矿的优化条件下,镍,钴,锰的浸出率分别为96.8%,96.6%,98.7%,铁、铝、镁、硅的浸出率分别降低到2.6%,16.9%,61.8%,1.9%,铬的浸出率降低到0.7%,浸出液中的铬以Cr~(3+)的形式存在,浸出液中没有Cr~(6+)。静置分离试验表明,在此浸出条件下的浸出矿浆固液分离效率较高。扫描电镜分别对30、40、60 min浸出渣相微观形貌的分析表明,浸出30 min时针铁矿中Fe~(3+)绝大部分溶出并经过水解重新沉淀,延长浸出时间只是使铁相的等粒-圆粒状颗粒分布趋于均化。浸出渣相的主要成分为Fe_2O_3,(H_3O)Al_3(OH)_6(SO_4)_2,KAl_3(SO_4)_2(OH)_6及Si O_2。 相似文献
19.
20.
镍是一种重要的战略金属,随着优质硫化镍矿日益匮乏,资源丰富的红土镍矿成为重要的提镍原料。本文以红土镍矿为研究对象,甲烷为还原剂,硫化钠为添加剂,考察了还原温度、甲烷浓度、还原时间及添加剂用量对镍、铁金属化率的影响,并通过扫描电子显微镜与能量色散光谱(SEM-EDS)分析对还原产物中镍铁的聚集情况进行了研究。结果表明:在还原温度900℃、还原时间60min、甲烷浓度20%、硫化钠添加量10%的条件下,还原产物中的镍、铁金属化率可分别达到89.05%、5.10%。硫化钠的加入促进了镍铁颗粒的聚集长大,有利于镍铁颗粒与杂质的分离,同时生成的FeS抑制了铁的深度还原,实现了镍的选择性还原。 相似文献