Benzohydroxamic acid to improve iron removal from potash feldspar ores

The technological mineralogy of the potash feldspar was investigated and a new collector named Yb105 was adopted to remove iron from potash feldspar ores.The technological mineralogy results indicate that the main components of the ore were feldspar,sericite,quartz and kaolinite,and iron mainly existed in limonite and hematite,most of which can be removed by beneficiation.The results show the benzohydroxamic acid can not only increase the recovery of iron and reduce the consumption of oleic acid collector,but also enhance the collecting performance of oleic acid at low temperature,which can realize the flotation of the ores at a low temperature and play an important role in saving energy to some extent.Compared with oleic oil,the benzohydroxamic acid had a great advantage in removing iron from potash feldspar,a potash feldspar concentrate with Fe grade of 0.23%,K2O grade of 12.59%and Na2O grade of 0.26%was obtained by flotation with Yb105 as collector,and the yield of the concentrate was 82.55%.

Synthesis of Leucite from Potash Feldspar

Leucite particles were synthesized from feldspar mixed with 0% to 52% potassium nitrate fired from 800 ℃ to 1 200 ℃ by solid state method. The X-ray Diffraction （XRD） patterns show that in the temperature range from 800 ℃ to 1 200 ℃, the leucite can be removed as the single crystalline phase. Kalsilite may be crystallized with leucite at 800 ℃, but can be eliminated after prolonged heating. The scanning electron Microscopy （SEM） images clearly display the that crystals of micrometer scale leucite, and the leucite crystals distribute evenly in the matrix. The Thermal expansion coefficient （TEC） of the samples fabricated is as high as 20.52×10^-6 ℃^-1 measured from 20 ℃ to 500 ℃. The mechanism of transformation from feldspar to leucite was proposed.

Removing Iron by Magnetic Separation from a Potash Feldspar Ore

A new permanent magnetic separator was introduced to treat the ores with the characteristics of weak magnetic iron minerals and in a fine size range. The new machine was applied to the iron removal from potash feldspar. The effects of the magnetic field intensity, pulp density and grinding fineness on the iron removal were investigated. The optimized operation parameters were achieved and listed as follows： the -0.074 mm content is 85%, the pulp density is 45% and the magnetic field strength is 2T. A close test of middles regrinding was also carried out to improve concentrate yield. The data show that the grade of TFe（total iron） in potash feldspar product decreased from 1.31% to 0.21% and the concentrate yield reached 85.32%. All the results indicated that the traditonal high-intensity electromagnetic separators can be betterly substituted by the new permanent magnetic separator. This study may provide the theoretical evidence for iron removal from potash feldspar.

Studies on Conversion of K in Potash Feldspar into Water-soluble Form

The studies for raising potash feldspar utilization ratio by physical, biological and chemical methods are carried out in laboratory and the results are presented. It is shown that calcinatory and biological methods have positive effects on conversion of K in potash feldspar into water-soluble form, but the conversion is low; chemical method can change most of insoluble potassium into available form, and might be significant in industry to some extent.

Preparation of ultrafine silica from potash feldspar using sodium carbonate roasting technology

A novel process was developed for the preparation of ultrafine silica from potash feldspar. In the first step, potash feldspar was roasted with Na_2CO_3 and was followed by leaching using Na OH solution to increase the levels of potassium, sodium, and aluminum in the solid residue. The leaching solution was then carbonated to yield ultrafine silica. The optimized reaction conditions in the roasting process were as follows： an Na_2CO_3-to-potash feldspar molar ratio of 1.1, a reaction temperature of 875°C, and a reaction time of 1.5 h. Under these conditions, the extraction rate of SiO_2 was 98.13%. The optimized carbonation conditions included a final solution p H value of 9.0, a temperature of 40°C, a CO_2 flow rate of 6 m L/min, a stirring intensity of 600 r/min, and an ethanol-to-water volume ratio of 1：9. The precipitation rate and granularity of the SiO_2 particles were 99.63% and 200 nm, respectively. We confirmed the quality of the obtained ultrafine silica by comparing the recorded indexes with those specified in Chinese National Standard GB 25576―2010.

Kinetics of roasting potash feldspar in presence of sodium carbonate

A novel process was proposed for the utilization of potash feldspar by roasting in the presence of sodium carbonate. The effects of roasting temperature, granularity, molar ratio of sodium carbonate to potash feldspar and roasting time on the silica extraction rate were investigated. Under the optimal roasting conditions, the silica extraction rate was 98%. The optimal conditions, determined using an orthogonal experiment, were found to be roasting temperature of 875 A degrees C, potash feldspar granularity of 74-89 mu m, molar ratio of sodium carbonate to potash feldspar of 1.2:1, and roasting time of 80 min. The kinetics of potash feldspar roasting in the presence of sodium carbonate was described by the shrinking core model and the reaction rate was found to be controlled by the chemical reaction at the particle surface. According to the Arrhenius expression, the activation energy was 164.99 kJ/mol, and the process could be expressed as [1-(1-alpha)(1/3)]=2.66x10(5) exp[-164990/(RT)] t.

Sintering behaviour of feldspar and influence of electric charge effects

The characterization of feldspar for electric porcelain and the behaviour of these materials after heating at 1230°C were studied. X-ray diffraction （XRD） and scanning electronic microscopy （SEM） were used to identify the present phases and the densification level. Feldspar sand was treated by flotation. The floated feldspar is constituted by microcline, quartz, and minor amounts of albite. The micro-structure of sintered feldspar at 1230°C is essentially vitreous with open microporosities. The dielectrical properties of composites were characterized by using the induced courant method （ICM）, which indicates that the charge trapping capacity depends on the mineralogical and chemical composition of feldspar.

树林植被根际土壤解钾菌的分离与多样性分析

为获得钾长石高效分解细菌,并分析土壤中解钾菌种类的多样性,采集了贵州省贵阳市花溪区树林植被根际土壤,选用钾长石为唯一钾源的选择性培养基筛选分离,经形态观察和基于16S rRNA基因序列的系统发育分析初步鉴定解钾菌株,并测定了部分菌株摇瓶条件下的解钾能力。筛选共分离了36株钾长石分解细菌,分别属于8个属,其中19株菌为剑菌属,9株菌为类芽胞杆菌属,且菌株GYM2311摇瓶培养液中的有效钾含量最高,达到了88.4 mg/L。结果表明该树林植被根际土壤中钾长石分解细菌具有一定的多样性,其中剑菌属和类芽胞杆菌属为优势种群,来自类芽胞杆菌属的胶质类芽胞杆菌GYM2311解钾能力最强。

钾长石-磷酸钙-石墨体系提取钾的实验研究

文中研究了钾长石-磷酸钙-石墨体系焙烧提取钾的工艺,通过助熔剂焙烧-水洗浸出-钾盐结晶分离工艺提高钾的提取率。在热力学分析的基础上,考察了还原剂用量、焙烧温度、钙硅摩尔比、助熔剂加入量对钾挥发率和浸出率的影响。结果表明,当m(富钾板岩)∶m(磷酸钙)∶m(石墨)=3.2∶1∶0.9、助熔剂氯化钙的加入量为钾长石质量的40%、反应温度为1350℃、焙烧时间为2 h时,钾的提取率超过95%,且磷酸钙中大部分的磷被还原,该工艺具有良好的工业应用前景。

热水沉积岩及矿物岩石标志

热水沉积物不同于普通沉积物 ,主要与热水流体类型有关。文中把热水流体划分为中高温热水流体与中低温热水流体。中高温热水沉积岩包括钾长石岩、硅质岩、电气石岩、钠长石岩、萤石岩 ;中低温热水沉积岩包括碳酸盐、硫酸盐等岩石。钾长石岩是文中确定的一种标准高温热水沉积岩 ,热水沉积钾长石以冰长石和钡长石为主 ;热水沉积碳酸盐矿物一般为铁、镁、锰、钙碳酸盐 ,碳酸盐的形成与CO2 和H2 O的不混溶温度有关 ,一般在不混溶温度 ,即 2 66℃以下生成 ,或在海水补偿线以上形成。热水沉积岩中有热水交代蚀变岩夹层 ,尤其是在高温热水活动区 ,可以交代泥质、钙泥质沉积物形成热水交代沉积岩 ,包括方柱石黑云母岩、透辉石透闪石岩、夕卡岩、绿泥石岩等。根据对霍各乞铜多金属矿床的研究 ,热水交代透辉石透闪石岩的稀土总量较低 ,表现为轻稀土富集 ,重稀土亏损 。

离子交换法从钾长石提钾

The extraction of potassium from potash feldspar by NaCl, CaCl 2, SrCl 2 and BaCl 2 has been investigated as function of salt kind and calcination temperature. The phase compositions of potash feldspar and its calcinated, and water insoluble substances of NaCl, CaCl 2 co-calcinated potash feldspar were analyzed by XRD. The experiment results showed that the order of ion exchange extraction of potassium was Na +>Ca 2+>Sr 2+>Ba 2+, and at calcination temperature over the melting points of NaCl or CaCl 2, the two salts gave potassium ion-exchange degree >90% much greater than that calcinated with other salts.

钾长石与氯化钠离子交换动力学

对钾长石与氯化钠反应过程首次使用离子交换动力学模型进行了实验研究.研究表明,不同产地、不同品位的钾长石在与氯化钠进行熔盐离子交换反应时符合相同的离子交换动力学模型.反应初期,内扩散为控制步骤,离子交换过程的表观活化能约为38·06kJ·mol-1;很快化学交换反应逐渐成为控制步骤,离子交换过程的表观活化能约为129·69kJ·mol-1.

氯化钠熔浸钾长石提钾过程

对熔融氯化钠浸取钾长石的提钾过程进行了研究. 结果显示,最佳反应条件是:反应温度890~950oC;氯化钠与钾长石的质量配比为1;钾长石的粒径为0.208 mm以下. 动力学分析显示,过程由Na+和K+在钾长石内部的离子扩散控制,扩散系数与反应温度之间的关系服从Arrhenius公式,即Deff=D0exp(-Ea/RT),其中,Ea=81.42 kJ/mol,D0=0.324 mm2/h.

磷石膏、钾长石制备硫酸钾的新工艺初探

在分析目前硫酸钾的主要生产工艺技术特点的基础上,提出了磷石膏、钾长石制备硫酸钾的新工艺构想,实验结果表明:在1200℃下焙烧,硫酸钙分解率达85.56%时,钾转化率可达92.17%,继续升高温度,二者没明显变化。焙烧温度低,易实现磷石膏分解率要求,同时生产硫酸钾和硫酸,更具工业化应用前景。

钾长石综合开发利用新方法

介绍一种低成本分解钾长石的新方法。该法循环利用助剂作为催化剂分解钾长石,将分解温度降至90℃～140℃。钾长石中钾元素用于制取复合肥,钾的提取率达到99%以上,副产物白炭黑和聚合硫酸铝(提取率达96%)分别作橡胶补强材料及水处理絮凝剂,助剂催化剂的回收率为90%～96%。与已有的其他方法相比,该法具有较高的应用和经济价值。

钾长石-NaOH体系水热法提钾工艺研究

在水热条件下建立钾长石-NaOH反应体系,全面探讨影响该体系钾溶出率的各种因素。试验表明,在最优条件下钾的溶出率可高达90%以上。原矿和滤渣的XRD物相分析表明,NaOH添加剂破坏了钾长石的晶体结构,并形成了新物相。

钾长石合成13X分子筛的实验研究

以钾长石为主要原料，经焙烧和水热合成工艺，合成了１３Ｘ分子筛粉．采用正交设计法确定了各工艺过程中的最佳工艺参数．合成分子筛的ＸＲＤ图、晶胞参数、ＳＥＭ图、ＤＴＡ图、化学成分、硅铝比与理想的１３Ｘ分子筛相似；吸附量达到国家化学工业产品标准．

钾长石与磷矿共酸浸提钾过程实验研究

参考重钙生产工艺,研究了磷酸用量、磷酸质量分数、磷酸温度、反应时间和矿石质量比对钾长石中钾溶出率和磷矿中磷的溶出率的影响,得出了适宜工艺条件,并对磷矿中氟离子的去向进行了探讨。

胶东谢家沟金矿床蚀变钾长石^40Ar-^39Ar年龄及地质意义

谢家沟金矿床位于胶西北焦家断裂带和招平断裂带之间。在系统观察坑道各类蚀变现象的基础上,发现围岩蚀变主要有钾长石化、硅化、黄铁矿化、绢云母化,其次可见绿泥石化和碳酸盐化等;基于蚀变的叠加和穿插关系查明了不同阶段的主要热液作用记录,从早到晚依次为钾长石化、黄铁绢英岩化、陡立石英硫化物细脉;蚀变具有明显的空间分带现象,从中心到两侧分别为陡立石英硫化物细脉带、黄铁绢英岩化带、钾长石化带。本次研究对蚀变钾长石开展了^40Ar-^39Ar精细测年工作,获得的坪年龄为(112.79±0.62)Ma(MSWD=5.76),与等时线年龄((115.56±1.72)Ma(MSWD=4.59))一致,限定了谢家沟金矿床的钾化蚀变年龄,与胶东地区获得的金成矿事件年龄相近,说明谢家沟金矿床与胶东地区金矿床是在同一成矿-热事件下形成的。结合区域岩浆演化特征,胶东地区在郭家岭岩体形成之后、在(120±10)Ma还存在一期与金成矿关系密切的岩浆活动。

与东秦岭超大型钼矿床有关的钾长石-石英条纹岩研究

东秦岭超大型钼矿带是世界上重要的钼矿带之一，带内分布着几个大型至超大型钼矿床。与这些大型－ 超大型钼矿床有关的岩体顶部都发育了钾长石石英条纹岩。钾长石石英条纹岩中钾长石富Ｓｉ，Ｋ，贫Ｎａ；其三斜度、有序度低。石英包裹体中Ｆ－ ，Ｋ＋高，ＣＯ／ＣＯ２ 低，缺少ＣＨ４，形成温度为４００℃～５００℃。氢氧同位素分析表明：δ１８ Ｏ＝ ９．０６×１０－ ３ ～１０．０３×１０－ ３ ，δＤ＝ － ５７．２２×１０－ ３ ～－ ７５．１０×１０－ ３ ，证明钾长石石英条纹岩的物质来自晚期岩浆热液。