首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 265 毫秒
1.
针对提取氧化硅后的油页岩灰渣,对改良碱石灰烧结法提取氧化铝过程中的铝溶出进行了实验研究,主要探讨了烧结温度、烧结时间、碱铝比及钙硅比对烧结熟料中的物相特点及铝溶出率的影响。运用X射线粉末衍射(XRD)对烧结熟料进行的物相分析结果显示,主要物相为铝酸钠(NaAlO2)和硅酸钙钠(Na2CaSiO4)。烧结实验结果表明,当烧结温度为1 150℃,保温时间为1.5 h,碱铝比为1.0,钙硅比为1.0时,烧结熟料中氧化铝的标准溶出率可达94%。  相似文献   

2.
水热法从钾长石中提取钾、硅、铝的实验研究   总被引:1,自引:0,他引:1  
通过水热化学反应将钾长石中的钾、硅和铝转变为可溶性组份,具有十分重要的应用价值.本文用单因素实验考察了不同水热反应实验条件对钾长石中钾、硅、铝溶出率的影响,并根据溶出率结果优化了反应条件.单因素实验结果表明:(1)在190℃条件下,随生石灰加入量的逐渐增加,产物中各元素的溶出率有一个先增加后减少的趋势.(2)在相同的生石灰、钾长石比例下,当反应16 h后,产物中各元素的溶出率随反应时间的延长趋于平缓.(3)随反应温度的逐渐增加,产物中各元素的溶出率逐渐增加.  相似文献   

3.
利用钾长石粉体合成雪硅钙石的实验研究   总被引:11,自引:1,他引:11       下载免费PDF全文
以氧化钙为反应物料,在200~250℃的水热反应条件下分解钾长石。实验研究了在不同的Ca/(Si Al)摩尔比、水固比、反应温度和反应时间条件下,钾长石中K2O的溶出率和固相的物相变化。结果表明,液相中K2O的溶出率为40%~87%,固相反应产物为结晶良好雪硅钙石晶体。采用化学分析、XRD、SEM、DSC_TG和BET等方法对合成的雪硅钙石粉体进行了表征,结果表明,合成的雪硅钙石粉体是由长5~10μm、宽100~200nm、厚度为49~50nm的薄片纤维晶体交织成的直径为30~40μm的空心球形团聚体,耐火温度高于650℃,是制备硅酸钙保温材料的良好原料。  相似文献   

4.
采用碱石灰烧结法从内蒙古三道沟地区的高铝煤矸石中提取了氢氧化铝,实验原料经过碱液预处理,使其中的铝硅质量比(Al2O3/SiO2)由原来的0.86提高到2.21。实验研究了烧结过程中烧结温度为1100℃、1200℃、1250℃、1300℃以及生料中Na2O/Al2O3摩尔比为0.94~1.0,CaO/SiO2摩尔比为1.90~2.10时,对熟料烧结质量的影响。结果表明,在烧结温度为1200℃、Na2O/Al2O3摩尔比为1.0,CaO/SiO2摩尔比为2.1时,熟料的烧结质量最好,其中氧化铝的溶出率最高达到94%。最佳条件下得到的溶出液以一水铝石为晶种,在添加甲醇并于30℃下分解5h,铝酸钠溶液中氧化铝的分解率达到88.9%;扫面电镜结果显示,生成的铝氧水合物呈片状生长。  相似文献   

5.
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   

6.
直接酸溶法浸取硫铁矿烧渣中铁的实验研究   总被引:4,自引:0,他引:4  
对常压下用盐酸直接酸溶提取硫铁矿烧渣中的铁进行了实验研究,探讨了影响硫铁矿烧渣酸溶的因素。结果表明,影响铁溶出率的主要因素为液固比、反应时间和温度;当液固比为4.0mL/g、反应温度100℃时,高速搅拌反应2h后,铁的溶出率可达72%,浸取液经进一步处理可生产氯化铁系列产品,有较好的应用前景。  相似文献   

7.
内蒙白旗地区火山碎斑熔岩矿物红外光谱特征研究   总被引:3,自引:0,他引:3  
正镶白旗碎斑熔岩和花岗斑岩中钾长石主要为高正长石和低透长石,有序度低,反映了白旗火山岩形成温度较高,钾长石有序度具明显的变化规律,反映了各相带岩石形成环境的差异性。各相带中石英的红外光谱反映了与钾长石相同的温度变化规律;岩石中锆石主要以晶质锆石为主;磁铁矿的红外光谱特征则表明碎斑熔岩形成于高氧化条件的侵出相环境。  相似文献   

8.
论钾长石的研究现状及开发前景   总被引:11,自引:0,他引:11  
钾长石提钾技术取得了可喜的进展。由于面临严重的缺钾状况,我国从20世纪50年代就进行了钾长石提钾的研究,但至目前钾长石综合利用方面仍不尽如人意。当今钾长石制钾肥、分子筛、白炭黑工艺研究已趋成熟,但其中存在问题还亟待解决,如:烧结温度太高、工艺对环境污染严重、固定投资昂贵、硅酸盐菌种纯培养周期太长等。通过对各工艺进行了优劣对比以及经济和技术的可行性的论证认为。钾长石综合开发利用有着很好的前景。  相似文献   

9.
迪彦钦阿木钼矿床位于内蒙古东乌旗地区,矿区侵入岩不发育,主要为细粒正长岩和基性岩脉,矿体主要发育在侏罗纪火山岩中,少量发育在细粒正长岩中,主要矿化类型为细网脉状、脉状、浸染状,具有斑岩型矿化特征。矿区的细粒正长岩中可见含矿石英-钾长石囊团或由之构成中心相的热液脉体,是岩浆-流体转化过程的直接证据。本文在详细岩相学观察的基础上,对石英-钾长石囊团中主要组成矿物开展了阴极发光图像分析,对石英、萤石中流体包裹体开展了显微测温实验,并借助SEM/EDS、显微激光拉曼探针、LA-ICP-MS等手段对包裹体成分进行了系统分析,基于以上实验结果对岩浆流体的出溶过程、出溶流体特征及矿质沉淀机制进行了探讨。研究结果表明,矿区钼成矿与细粒正长岩岩浆出溶流体有关;富F和挥发分造成成矿岩浆具有低的固相线温度和较低的黏度,因此成矿岩浆可以沿断裂快速上侵到地壳浅部;岩浆上侵过程中的减压沸腾可能是流体出溶的主要机制;早期出溶流体为富F和富CO2的中高温(227~457℃)、中低盐度[w(NaCleq)=0.3%~8.6%]流体,由于快速减压造成流体沸腾形成低盐度富CO  相似文献   

10.
通过CaCl2添加剂对KAlSi3O8-CaSO4-CaCO3体系研究反应温度和反应时间的影响研究,结果表明:随着CaCl2加入量的增多,体系的反应温度下降,反应时间缩短,当CaCl2的加入量为10%时,反应温度可降至1000℃,反应时间降至25min,此时KAlSi3O8的转化率仍可高达83.24%。研究CaCl2的加入对KAlSi3O8-CaSO4-CaCO3反应体系动力学过程的影响,得出反应体系符合金斯特林格动力学方程:FK(G)=1-2/3G-(1-G)2/3=KKt,反应受扩散过程控制,计算出当CaCl2的加入量为10%时,体系的表观活化能可从原来的128.921kJ/mol下降至58.320kJ/mol。  相似文献   

11.
鄂尔多斯盆地东部太原组砂岩骨架颗粒中几乎没有碎屑长石,残余的微量长石(在岩石中的平均含量为0.4%.低于X射线衍射检测限)主要为钾长石,同时具有较低的自生高岭石含量(1.02%)、很低的自生石英含量和同期火山物质含量,以及较高的自生伊利石含量(1.22%),这表明太原组的自生伊利石主要是在相对高温的深埋藏封闭条件下,通过钾长石溶解反应:钾长石+H~++H_2O→高岭石+硅质+K~+和高岭石伊利石化反应:高岭石+K~+→伊利石+H~++H_2O或其加和反应:钾长石+高岭石→硅质+伊利石+H_2O形成,后者通过消耗钾离子而克服钾长石溶解的动力学屏障,是前者的重要驱动反应,并向流体输出氢离子,因此对次生孔隙的形成、尤其是在相对深埋藏的成岩过程中与钾长石溶解有关的次生孔隙的形成具有显著的积极作用.  相似文献   

12.
通过具体实例,简要介绍了矿物材料学研究中有关反应动力学研究的基本原理,给出了对硅酸盐体系若干典型过程的反应动力学研究结果,包括:(1)高铝粉煤灰-Na2CO3体系的中温烧结反应和钾长石-石膏-碳酸钙体系钾长石的热分解反应;(2)KA lS i3O8-Ca(OH)2-H2O体系钾长石水热分解-雪硅钙石晶化反应;(3)S iO2-A l2O3-CaO体系微晶玻璃的β硅灰石晶化反应;(4)13X微孔分子筛和MCM-41介孔分子筛对Hg2+的吸附反应。反应动力学研究成果可望对矿物材料制备实验方案优化、工业生产过程的条件控制以及改进矿物材料性能提供理论指导。  相似文献   

13.
钾长石粉酸浸除铁的实验研究   总被引:8,自引:1,他引:8  
郑骥  马鸿文等 《地球科学》2001,26(6):657-660
在利用钾长石粉合成沸石分子筛和制取碳酸钾技术中,铁的存在会降低沸石的白度。对北京平谷、天津蓟县、内蒙白云鄂博三地钾长石粉进行硫酸酸浸除铁实验,获得最大铁浸出率分别为88.6%、93.2%和64.6%,且前两地钾长石粉中铁的浸出行为相似,酸浸除铁效果均优于白云鄂博钾长石粉。采用正交实验法研究硫酸浓度、酸浸温度和时间对除铁效果的影响,表明三者对不同地区钾长石粉酸浸除铁效果的影响程度各不相同。钾长石酸浸除铁反应开始时,铁的溶解极快,反应速率主要由化学反应控制;其后溶解相对缓慢,反应速率则由扩散作用控制。  相似文献   

14.
ABSTRACT In the Woodroffe Thrust mylonite zone, central Australia, recrystallization in plagioclase and K-feldspar involved subgrain rotation, assisted by grain-boundary or kink band boundary bulging, without contribution from a change in the chemical composition from host grains to new grains. The size of subgrains and new grains changes across the mylonite zone, apparently as a function of the strain rate and the H2O content of the rock. The partitioning of deformation into zones of progressive shearing and progressive shortening controls the sites of recovery and recrystallization in feldspar during mylonitization. The size of feldspar porphyroclasts in well developed mylonites is governed by the scale of deformation partitioning reached in the earlier stages of mylonitization, before the formation of a large proportion of fine-grained matrix that can accommodate the progressive shearing component of the deformation. Recrystallization occurs in microcline, apparently without involving a translation to a monoclinic structure, as microcline-twinned new grains are common adjacent to microcline-twinned host grains. K-feldspar triclinicity values calculated from XRD traces increase from the margins to the interior of the mylonite zone, in conjunction with deformation intensity. K-feldspar host grains locally have cores of orthoclase or untwinned microcline, surrounded by mantles of twinned microcline, suggesting a relationship between the presence of microcline twinning and the degree of K-feldspar triclinicity.  相似文献   

15.
甘肃花牛山东钾长花岗岩40Ar/39Ar同位素年龄及其地质意义   总被引:19,自引:1,他引:19  
对甘肃花牛山东复式花岗岩体中钾长花岗岩的钾长石进行了详细的40Ar/39Ar同位素年龄测定,11个加热阶段所获数据构成-条相关关系非常好的直线,其对应的等时线年龄为194.25±1.96 Ma(2σ).40Ar/36Ar初始值为288.87±2.17(2σ),接近于尼尔值(295.5).鉴于该岩体形成之后未受到明显的构造-岩浆活动或其它热事件的影响,因此,194 Ma代表了钾长花岗岩钾长石的形成时代.花牛山东钾长花岗岩是燕山早期构造-岩浆活动的产物.由此推断,花牛山地区构造-岩浆活动时间不是印支期,更不是海西期,而是中生代燕山早期.  相似文献   

16.
The decomposition of K-Feldspar is significant to the development and utilization of K-feldspar as potassium resources. Potassium feldspar powder was decomposed successfully by hydrothermal method using CaO additive. Tobermorite solid and KOH solution were obtained as a result of the hydrothermal decomposition.  相似文献   

17.
Electrical conductivity measurements on dry polycrystalline K-feldspar were performed at 1.0 to 3.0 GPa and 873 to 1,173 K with a multi-anvil high-pressure apparatus and the Solartron-1260 Impedance/Gain Phase Analyzer in the frequency range of 10?1 to 106 Hz. At each temperature the complex impedance displays a perfect semi-circular arc that represents the grain-interior conduction. Under the experimental conditions, electrical conductivity exponentially increases with increasing temperature and slightly decreases with increasing pressure; however, the effect of pressure on the conductivity is less pronounced than that of temperature. The activation enthalpy decreases slightly from 0.99 to 1.02 eV with increasing pressure, and the activation energy and activation volume for K-feldspar are 0.98 eV and 1.46?±?0.17 cm3/mol, respectively. According to these Arrhenius parameters, ionic conduction is proposed to be the dominant conduction mechanism in K-feldspar at high temperatures and pressures, and potassium ions are the charge carriers transporting by an interstitial mechanism. The diffusion coefficient of potassium at high temperatures was calculated from our conductivity data on K-feldspar using Nernst–Einstein equation, and the results were compared with the previous experimental results.  相似文献   

18.
包古图斑岩铜矿床的钛矿物特征及其成因意义   总被引:4,自引:2,他引:2  
在大量薄片鉴定的基础上,本文对包古图斑岩铜矿的钛矿物组合特征及其形成机制进行了研究。主要钛矿物为榍石、钛铁矿和金红石。其中榍石在成岩期和成矿期均有形成,但主要见于成矿期的钾化阶段,与钾长石、黑云母共生;在后期的青盘岩化和沸石化阶段也有出现,但含量相对较少。成岩期的钛铁矿很少见,成矿期各蚀变阶段均有分布,但最常见于钾化阶段。金红石仅见于成矿期,钾化阶段早期可与钾长石、黑云母、石英等共生,还见有被榍石包裹的细粒金红石,青盘岩化阶段亦有形成,与绿泥石共生。这些钛矿物最常出现于黑云母颗粒内部或其附近,这可能是斑岩型矿床的特征之一。榍石SiO2和CaO含量与理论值接近,TiO2偏低;钛铁矿均含锰,MnO含量1.97%~4.49%,还见有锰钛铁矿;金红石含有一定量的SiO2和FeOT,个别颗粒还含有少量Al2O3、MgO和P2O5。钛矿物组合特征表明包古图含矿斑岩为I型,形成于较高氧逸度环境,侵位深度不大。  相似文献   

19.
R. H. Vernon 《Lithos》1978,11(4):283-289
High-grade metapelitic gneisses rich in cordierite and K-feldspar at Cooma, N.S.W., Australia, show microstructural evidence of partial to complete replacement of cordierite grains with biotite inclusions by fine-grained, symplectic intergrowths of andalusite, biotite and quartz. The replacement occurred during the later stages of the history of the Cooma Complex, under retrograde conditions. An equation for the local reaction: cordierite+red-brown biotite+H2O+K+ andalusite+green-brown biotite+quartz+H+ can be balanced approximately, using compositions obtained from microprobe analyses of the minerals involved. The volumes occupied by the solid reactants and solid products are nearly identical. The potassium and water were derived from an unknown external source, possibly connected with the replacement of K-feldspar by muscovite in nearby rocks.  相似文献   

20.
The study area in southeastern Slovenia is part of the transitional zone between the internal and the external Dinarides. Within Jurassic bedded cherts there are up to 2 cm thick shale intercalations, consisting of laminated, soft, fine-grained, green to brown material whose origin has been in question. In the majority of Tethyan cherts, the interbedded material is reported to be volcanogenic and/or terrigenous, although a detailed mineralogical analysis of the material is lacking. An XRD analysis confirmed the presence of quartz, illite, chlorite and K-feldspar, which is the prevailing component in some samples. Major and trace element data exclude both a volcanogenic and an hydrothermal origin. Several discrimination diagrams indicate the upper crustal terrigenous nature of shales and a biogenic silica source. The source material was probably from a Variscan crust, which at the time of deposition had already been weathered to kaolinite, and some sporadic muscovite. The MnO/Al2O3 ratio suggests a slow sedimentation rate of cherts and a faster one for shales, which probably settled from distal turbidity currents. The negative Ce anomaly indicates prolonged contact with ocean water. Sediments were deposited on a Tethyan passive margin, originally as silica-rich carbonate beds intercalated with mud. During late diagenesis, the mixing of marine and meteoric waters caused the further silicification of limestone and simultaneous potassium enrichment of shale which led to their alteration into illite or chlorite and, in sediments already rich in K-minerals, into K-feldspar.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号