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石煤中影响钒转浸率的主要因素研究 总被引：12，自引：0，他引：12
通过对石煤提钒焙烧阶段焙烧温度和添加剂作用、配比的研究,得出了焙烧阶段最适宜的焙烧温度、入米温度和添加剂配比范围。实验结果表明,采用焙砂水浸后渣再用稀酸浸出的方法,钒的转浸率平均可提高１０％左右。 相似文献
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为了粉煤灰的高附加值综合利用,采用酸浸法对准格尔地区循环流化床粉煤灰进行了镓的浸出实验研究,考察了多种因素对镓的浸出率的影响,包括粉煤灰粒度,酸的种类与浓度、酸浸温度与时间、固液比等。结果表明,提高镓的浸出率的适宜条件为:粉煤灰粒度200目,盐酸的浓度6 mol/L,酸浸温度应大于160℃,酸浸时间6 h,液固比在5∶1~6∶1之间为宜。在优选的工艺条件下,镓的浸出率可达80%以上。从粉煤灰中提取镓,使其作为一种资源加以利用,是提高粉煤灰综合利用价值的有效途径。 相似文献
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为了解川北新发现的硅质岩型铼多金属矿可选性,开展了铼及伴生硫、硒、钒、钼等多种元素的回收工艺研究.试验确定,采用"重选选硫一尾矿氧化焙烧挥发回收铼硒-碱浸回收钒钼"的工艺,可以有效回收矿石中的铼、硒,并综合回收矿石中伴生的黄铁矿和钒、钼元素.重选工艺可以得到产率10.68％、硫品位48.33％的优质硫精矿产品,硫的回收率62.72％;选硫尾矿在950℃氧化焙烧2h,硒的挥发率可达到99.96％以上,铼的挥发率为91.69％;选硫尾矿焙砂碱浸工艺,钒的渣计浸出率88.09％、液计浸出率91.49％,钼的渣计浸出率92.13％、液计浸出率92.52％. 相似文献
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根据红土镍矿中镁橄榄石的存在形式,采用高温固相法合成Mg2SiO4,通过正交试验优化Mg2SiO4在高浓度氢氧化钠中的浸出过程,利用XRD对浸出反应渣进行物相分析,探讨了液固比、氢氧化钠浓度、反应时间和反应温度对Mg2SiO4中SiO2的浸出率的影响。结果表明:Mg2SiO4在高浓度氢氧化钠中浸出过程优化实验条件为,反应温度220℃,反应时间120min,液固比6∶1,NaOH浓度85%;浸出反应渣的XRD分析结果表明:NaOH介入硅酸盐晶格中,其中间产物为Na2MgSiO4,Mg2+经过碱熔融过程可以脱离SiO4阵列,以Mg(OH)2形式从其硅酸盐中得以释放。 相似文献
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根据红土镍矿中镁橄榄石的存在形式,采用高温固相法合成Mg2SiO4,通过正交试验优化Mg2SiO4在高浓度氢氧化钠中的浸出过程,利用XRD对浸出反应渣进行物相分析,探讨了液固比、氢氧化钠浓度、反应时间和反应温度对Mg2SiO4中SiO2的浸出率的影响。结果表明:Mg2SiO4在高浓度氢氧化钠中浸出过程优化实验条件为,反应温度220℃,反应时间120min,液固比6∶1,NaOH浓度85%;浸出反应渣的XRD分析结果表明:NaOH介入硅酸盐晶格中,其中间产物为Na2MgSiO4,Mg2+经过碱熔融过程可以脱离SiO4阵列,以Mg(OH)2形式从其硅酸盐中得以释放。 相似文献
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杂卤石矿地浸模拟实验研究 总被引：4，自引：0，他引：4
通过对难溶含钾矿物杂卤石的柱浸实验模拟石溶浸过程分析发现,采用CaCl2溶液作溶浸剂,其溶浸剂浓度、淋洗速度、矿石粒度、浸滤路径等因素对K溶浸率及溶浸速度均有影响,当矿石粒度为1 mm和5 mm时,钾浸出率分别可达到80%和70%以上,溶浸剂浓度增加,可提高钾的浸出率,但CaCl2浓度高于5%后,效果不明显。淋洗速度增大,虽可提高钾的浸出率,但同时浸出液中钾的富集程度有所降低,以4.5 ml/h～10 ml/h为佳;增加渗滤路径长度可同时提高钾的浸出率和富集程度。实验结果表明杂卤石溶解过程受固相层扩散控制,溶解反应过程较好地符合“收缩未反应核模型”的固相控制动力学方程1-(2/3)α(1-α)2/3=(2MD′c/bργ02)t。研究结果为地浸开采深埋藏杂卤石提供了一定的实验基础。 相似文献
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The low-grade vanadium-containing stone coal used in this experiment was collected from Wuxi Coun- try, Chongqing City, China. The experiment focused on the vanadium recovery from roasted residue through opti- mizing the process conditions of an effective and environmentally-friendly technology, named calcified roast- ing-sulfuric acid leaching technology. By single-factor experiments and orthogonal experiments, the effects of roast- ing temperature, roasting time, sulfuric acid concentration and leaching time on the leaching ratio of vanadium were analyzed. The results showed that the leaching ratio of vanadium reached 85.5% under the proper technological con- ditions of roasting temperature=950℃, roasting time=4 h, 40% concentration of sulfuric acid and leaching time=6 h. 相似文献
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石煤钠盐焙烧气氛对钒转化的研究 总被引：3，自引：0，他引：3
石煤钠盐焙烧是复杂的气、液、固多相化学反应,焙烧气氛对钒焙烧转化率有重要影响。本文在钒价态研究工作的基础上,研究了在氧化—氯化焙烧下,提高气相中HCl或Cl_2分压,使钒转化率有不同程度的提高,小试表明能提高5～20％,半工业生产试验提高5.4％。该技术简易可行,实用性强,具有较好的经济效益。 本文对氧化—氯化焙烧的技术条件、焙烧温度、时间、含碳量及钠盐配比等作了全面研究。通过气体成分分析,焙砂浸出液成分分析和物相分析鉴定,对氧化—氯化焙烧提高钒焙烧转化率的机理作了探讨。 相似文献
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Leaching of three high-phosphorus manganese ore samples from central India with dilute hydrochloric acid (0.1–0.6 M) has been found to reduce their phosphorus contents below the specified limit of 0.12%. Various process parameters, such as concentration of acid, liquid/solid ratio, temperature and period of leaching, particle size of ore etc., have been investigated in detail and optimum values have been worked out on the laboratory scale. Both liquid/solid ratio (slurry concentration) and temperature of leaching appear to be critical process parameters. While the increase in liquid/solid ratio above 3–4 has no beneficial effect, leaching temperature above 50°C has an adverse effect on the extent of dephosphorization. Grain size of ore finer than 100 mesh (B.S.) in general gives satisfactory dephosphorization. Laboratory-scale results have been, in general, supported by bench-scale work which shows that phosphorus can be effectively removed from high-phosphorus manganese ores of central India by leaching in dilute hydrochloric acid at ambient temperature. Comparative performance of the dilute solutions of all the three mineral acids as leaching agents has been discussed. 相似文献
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江西玉山石煤烧结包裹与钒转化的研究 总被引：7，自引：0，他引：7
江西玉山含钒石煤既是低热值能源,又是一种新类型钒矿资源。为充分利用这种资源,在600～1150℃下进行了氧化培烧和钠化焙烧,测定了煤灰的松装密度d和钒转化率η,研究厂烧结包裹作用。结果表明:温度升高,煤灰烧结严重,对钒包裹几率加大,钒转化率降低。石煤作为能源利用时,燃烧温度不宜超过950℃,石煤钠化焙烧提钒最佳温度775℃。在两种焙烧条件下的石煤烧结机理作了探讨,并进一步得出玉山石煤烧结与包裹的关系式。 相似文献
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Manganese was extracted from leaching low-grade manganese ore in sulfuric acid medium. The effects of granule diameter, leaching time, liquid/solid ratio (V/W) and the concentration of sulfuric acid were investigated through orthogonal and single factor experiments. The experimental results showed that the optimal leaching conditions are, size of 0.054mm, 120 minutes of reaction time, 3(V/W) of liquid/solid ratio and 30% of the concentration of sulfuric acid (g/g). Under those conditions, the leaching efficiency is 96.73%. The kinetics of the leaching process is in accordance with the characteristics of fractal reaction. 相似文献
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《矿物学报》2013,(Z1)
Fly ash was used to prepare alumina and silica white, The 3 stages of the process are as follows: ammonium sulfate calcining, acid leaching and alkali dissolution. The optimum conditions for the experiments to determine are as follows: molar ratio of (NH4)2SO4/Al2O3 is 6, the calcining time is 2h, he H2SO4 concentration is 20%, the leaching temperature is 80℃ and dissolution duration is 2h, the ratio of solution and solid reaction material is 6 for ammonium sulfate calcining and acid leaching stage, reaction time 30min, ratio of liquid to ore 5∶1, alkali concentration 45% and reaction temperature 95 ℃for the alkali dissolution stage. Under these conditions, the total leaching efficiencies of Al2O3 and SiO2 are 78.86% and 95%, respectively. The quality of the main products alumina and silica white can meet the national standards of GB/T24487-2009 and GB10517-89, respectively. 相似文献
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Yun Chen Qiming FengYanhai Shao Guofan ZhangLeming Ou Yiping Lu 《International Journal of Mineral Processing》2006
Extraction of molybdenum and vanadium from ammonia leaching residue (main chemical composition: 2.05% Mo, 0.42% V, 65.6% Al2O3 and 10.7% SiO2) of spent catalyst was investigated by roasting the residue with soda carbonate, followed by hydrometallurgical treatment of the roasted products. In the roasting process, over 91.3% of molybdenum and 90.1% of vanadium could be extracted when a charge containing a sodium carbonate to spent catalyst ratio of 0.15 was roasted at 750 °C for 45 min and the roasted mass was leached with water (liquid to solid ratio of 2) at 80–90 °C for 15 min. After the purification of leach liquor, an extraction solvent consisting of 20 vol.% trialkylamine (N235, commercialized in China) and 10 vol.% secondary octyl alcohol (phase modifier) dissolved in sulfonated kerosene was used to extract molybdenum and vanadium in leach liquor. 10 wt.% ammonia water was used as stripping agent. Adding 30 g/l NH4NO3 to the stripping solution and adjusting the pH to 7–8.5, over 99% of vanadium can be crystallized as ammonium metavanadate. Over 98% of molybdenum can be crystallized as ammonium polymolybdate when pH is between 1.5 and 2.5 (pH is adjusted by HNO3). Ammonium metavanadate and ammonium polymolybdate were calcinated at 500–550 °C, the purity of MoO3 and V2O5 was 99.08% and 98.06% respectively. In the whole process, 88.2% of molybdenum and 87.1% of vanadium could be achieved. The proposed roasting, leaching and separation steps give a feasible alternative for the processing of ammonia leaching residue of spent catalyst and can be applied in the comprehensive utilization of low grade molybdenum ores. 相似文献
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肃北县黑刺沟金矿属砾岩型金矿,该矿矿石属典型的含砷、硫微细粒难选金矿石。通过各种选矿试验,该矿矿石用全泥氰化法金浸出率低于１７％ ,浮选、焙烧氰化法浸出效果也不好,而用细菌预氧化、碱浸预氧化氰化法效果较好,金浸出率最高可达９２．４％ ,是处理该类矿石较有效的选矿方法。 相似文献
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DS1试样主要化学成分为Al2O3 64.31%,SiO2 8.92%,A/S 7.11,TS 0.30%;该试样经焙烧-湿法预脱硅处理后,A/S由7.11提高到26.37,Al2O3由63.41%升高到78.53%,TS从0.30%降低到0.11%;焙砂在温度280℃,时间60 min,配料比αk 1.45,碱浓度为220 g/l,石灰添加量4%的最佳溶出条件下,Al2O3的绝对溶出率为95.52%,相对溶出率99.59%;Ga的溶出率91.63%,溶出物在1100℃下锻烧2 h,可获得Al2O3>99%,其他各项指标均优于YS/T274-1998AO-1行业标准的氧化铝产品。 相似文献