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In the geological evolution of the Tarim Basin, many transgressions and relictions happened. So there have been plentiful sources of salt. Moreover, because of uttermost drought, a lot of salt has been deposited. It is possible to find potash salt in this area. In our fieldwork, we have found salt and brine in western Tarim Basin. Based on a geological survey and the characteristics of sedimentary facies and paleogeography, this paper deals with the geochemical parameters and discusses the possibility of formation of potash salt in terms of the chemical analyses of samples collected from western Tarim Basin. Results of brine analysis lead to some conclusions: most of these salt brines have eluviated from very thick halite beds, mainly chloridetype salt and this kind of halite does not reach the stage of potash deposition in all aspects; WKSL (Wukeshalu) occupies a noticeable place, and we should attach importance to this district because there have been some indicators of the occurrence of potash deposits as viewed from the contents of Br and K. Finally, low Br contents are recognized in the Tarim Basin as a result of salt aggradation, and this point of view has been proved by the results of this experiment and the data available. It cannot depend upon the index of Br to judge the evolution stage of halite. We must look for other facies of potash except marine facies. 相似文献
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针对有效缓解中国水溶性钾盐资源短缺矛盾,对中国20余处代表性富钾岩石资源利用关键技术进行了长期探索研究。结果表明,其主要富钾矿物为钾长石,采用Ca(OH)2-、NaOH-、KOH-H2O介质水热碱法处理,均可使其结构发生解离,分别生成固相产物雪硅钙石、水羟方钠石、六方钾霞石三种物相,适合作为矿物基硝酸钾载体、提取氧化铝及同时回收苛性碱,以及采用酸浸法制备农用硫酸钾、硝酸钾产品。相应地,液相产物分别为KOH溶液、硅酸钠钾和硅酸钾碱液,适合于加工碳酸钾、硫酸钾、硝酸钾、磷酸钾等多种钾盐产品。在系统流程中,NaOH、KOH可实现循环利用,故水热碱法技术具有一次性资源、能源消耗量少、钾矿资源利用率高、生产过程清洁高效等优势。基于上述成果,已系统建立了非水溶性钾资源高效利用技术体系。水热碱法技术的规模化工程应用,将有助于显著减少钾盐(肥)的进口依存度,改善其消费结构,提高钾资源的保证程度。 相似文献
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WANG Mili LIU Chenglin JIAO Pengcheng YANG Zhichen Institute of Mineral Resources Chinese Academy of Geological Sciences Baiwanzhuang Ro Beijing Department of Environment Physical Geography School of Environment Peking University Beijing 《《地质学报》英文版》2005,79(1):53-65
Located in the eastern part of the Tarim basin, Xinjiang, the Lop Nur was an ultimate water catchment area of the Tarim basin during the Quaternary. Through nearly ten years of investigation and research, the authors have found a superlarge brine potash deposit in the Luobei subbasitv—a secondary basin of the Lop Nur depression. The deposit has been mined now. On that basis, the authors propose new theories on the genesis of the potash rock deposit. In the tectonic and geomorphologic contexts, the Tarim basin lies in a “high mountain-deep basin” environment. At the beginning of the Quaternary, influenced by the neotectonic movement, the Lop Nur evolved into a “deep basin” in the Tarim basin. At the end of the middle Pleistocene, neotectonic migration began to take place in the interior of the Lop Nur and a new secondary deep basin—the Luobei subbasin—formed gradually. Despite its small area, it is actually the deepest subbasin in the Lop Nur depression, where brines of the Lop Nur Salt Lake gather and evaporate, thus providing materials for the formation of a superlarge brine potash rock deposit. With respect to the phenomenon of brine concentration and change with deepening of the lake, the authors propose a model of “high mountain-deep basin” tectonic migration for potash concentration. In the sedimentological context, the honeycomb-shaped voids developed in glauberite rock in the subbasin are good space for potash-rich brine accumulation. Study indicates that the deposition of glauberite requires recharge of calcium-rich water.In the Tarim area the calcium-rich water might come from deep formation water or oilfield water, and the river water recharging the Lop Nur Salt Lake was rich in sulfate radicals and other components; in addition, the climate in the area was very dry and the brine evaporated steadily, thus resulting in deposition of substantial amount of glauberite, potash accumulation in intercrystal brine and final formation of the potash deposit. Generally, potash formation in a salt lake undergoes a three-stage process of “carbonates→sulfates (gypsum and glauberite)→chlorides (halite etc.)”, but in the study area there only occurred a two-stage process of “carbonates→sulfates (gypsum and glauberite)”. The authors call this new geological phenomenon the “two-stage potash formation” model. In conclusion, the superlarge Lop Nur potash deposit is the result of combined “high mountain-deep basin” tectonism and “two-stage potash formation”. 相似文献
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本文讨论以工业KCI和NH4HCO3为原料、采用离子交换法(国产732钠型树脂)生产K2CO3的工艺。小试验的结果:以20%KCI溶液上柱,以分段交换率在50%以前为穿漏点、流速为0.033(ml/min.ml树脂)时,总交换率达83.3%,工作交换容量达2.24(毫摩尔钾/ml树脂);当以饱和NH4HCO3溶液进行解脱、流速在0.033(ml/min.ml树脂)时,解脱率达91.8%,产品的含量为98.2%。 相似文献
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Firstly, the macroscopic chemical equilibrium state of a series of chemical reactions between intercrystal brine and its media salt layer (salt deposit) in Qarhan Salt Lake was studied by using the Pitzer theory. The concept of macroscopic solubility product and its relation with accumulated ore dissolving ratio were presented, which are used in the numerical model of dissolving and driving exploitation of potassium salt in Qarhan Salt Lake. And secondly, with a model forming idea of transport model for reacting solutes in the multi-component fresh groundwater system in porous media being a reference, a two-dimensional transport model coupled with a series of chemical reactions in a multi-component brine porous system (salt deposits) was developed by using the Pitzer theory. Meanwhile, the model was applied to model potassium/magnesium transport in Qarhan Salt Lake in order to study the transfer law of solid and liquid phases in the dissolving and driving process and to design the optimal injection/abstraction strategy for dissolving and capturing maximum Potassium/ Magnesium in the mining of salt deposits in Qarhan Salt Lake. 相似文献
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以河南省卢氏县钾长石制备雪硅钙石后的提钾母液为研究对象,成功地制备了电子级碳酸钾.母液经酸化、除杂、浓缩后,当溶液密度增加到1.444 1 g/mL时,通过加入乙醇降低KHCO3溶解度的方法制得了碳酸钾.化学分析结果表明产品达到了GB/T1587-2000Ⅱ型碳酸钾的要求. 相似文献
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碳酸钠碱熔-电感耦合等离子体发射光谱法测定石墨中的常量元素硅铝钙镁铁钛锰磷 总被引:1,自引:1,他引:0
石墨化学性质稳定,需采用高温碱熔(1000℃)才可使样品分解完全,已有分析方法在样品前处理不同的阶段使用不同材质的坩埚。基于石墨性质和坩埚熔样情况,本文采用预先已均匀铺垫0.50 g碳酸钾的高熔点铂坩埚灼烧石墨样品,样品灼烧后直接在原坩埚中加入0.80 g碳酸钠碱熔,熔融物用稀盐酸提取后用电感耦合等离子光谱法(ICP-OES)实现了石墨中8种常量元素(硅铝钙镁铁钛锰磷)的同时测定。方法检出限为13~228μg/g,方法精密度(RSD,n=12)为0.7%~7.2%;全流程加标回收率为90.5%~105.0%;实际土状和鳞片石墨样品的测定结果与化学分析法无显著差异。本方法避免了铂坩埚的损毁和样品在前处理过程中的损失,分析过程简单、分析速度快。 相似文献