检索结果-南通市图书馆

Water leaching kinetics and recovery of potassium salt from sintering dust

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第12期23卷 3770-3779页

作者：詹光郭占成北京科技大学钢铁冶金新技术国家重点实验室北京100083

Surface morphology and inner structure of the dust were observed by ICP-AES, SEM-EDS and XRD to examine the strengthening measures of leaching potassium salt from the sintering dust by water. The results showed that the main component of the sintering dust was iron-oxygen compound, with KCl adsorbed on its surface. Leaching experiments showed that the KCl in the ESP dust could be separated and recovered by water leaching and fractional crystallization. The yield of K-Na vaporized crystalline salt was 18.56%, in which the mass fractions of KCl, NaCl, CaSO4 and K2SO4 were about 61.21%, 13.40%, 14.62%and 10.86%, respectively. The leaching kinetics of potassium salt from the sintering dust fits the external diffusion model well. The leaching speed and the leaching rate of the potassium salt can be increased by increasing the leaching temperature, strengthening the stirring speed and increasing the liquid-solid ratio.

关键词： potassium salt sintering dust leaching kinetics intensified leaching

Preparation of potassium salt with joint production of spherical calcium carbonate from sintering dust

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2015年第2期25卷 628-639页

作者：詹光郭占成北京科技大学钢铁冶金新技术国家重点实验室北京100083

Several physical and chemical detection methods were used to study the basic properties of sintering dust （ESP dust） collected from Baogang Steel Corporation. The result shows that the major constituents of the ESP dust are KCl, NaCl, Fe2O_3 and Fe3O_4. Water leaching experiment on the sintering dust shows that KCl in the ESP dust can be separated and recovered by water leaching and fractional crystallization. Component analysis of leaching solution indicates that the massive calcium sulfate in the leaching solution should be removed first in order to obtain the pure potassium salt. In order to provide theoretical guidance to inhibit the dissolution of calcium ions from the sintering dust, the water leaching experiment of ESP dust and the dissolution behavior of CaSO_4 in the potassium chloride, sodium chloride, potassium sulfate and their mixed salt solution were studied. It is found that, a lower liquid-solid ratio should be chosen in the leaching process to inhibit the dissolution of calcium sulfate dehydrate. Using sodium carbonate solution as a precipitating agent, the influences of the concentration of sodium carbonate solution, reaction temperature, stirring speed and equilibrium time on the preparation of the spherical calcium carbonate were studied. Spherical calcium carbonate with good dispersing performance and grain size distribution in nanometer range of less than 10 μm was obtained. Furthermore, a potassium recovery process with joint production of spherical calcium carbonate was designed. This process is technically viable and considerable in economic benefit.

关键词： sintering dust potassium salt recovery experiment spherical CaCO_3

20 Years Advances in Preparation of potassium salts from Potassic Rocks:A Review

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第6期89卷 2058-2071页

作者： MA Hongwen YANG Jing SU Shuangqing LIU Meitang ZHENG Hong WANG Yingbin QI Hongbin ZHANG Pan YAO Wengui School of Materials Science and Technology China University of Geosciences Bluesky Technology Corporation School of Mathematics and Physics China University of Geosciences

Long-term research on key techniques of clean utilization of potassic rocks from over twenty localities has been performed to settle the shortage of soluble potassium resources in China. The results show that K-feldspar as the principal mineral enriched in potassium could be decomposed in the media of Ca（OH）_2, NaOH, KOH-H_2O solution via hydrothermal treatment, into tobermorite, hydroxylcancrinite, and kalsilite respectively. By further processing, these compounds are feasible for being as slow-release carrier of potassium nitrate, extracting alumina, and preparing farm-oriented fertilizers of potassium sulphate and nitrate. Correspondingly, the filtrate is KOH,（Na, K）_2SiO_3, and K_2SiO_3 solution, from which potassium carbonate, sulphate, nitrate, and phosphate could be easily fabricated. As NaO H and KOH are recycled in the processing chains by causticizing sodium and/or potassium metasilicate solutions, the hydrothermal alkaline techniques as developed in this research have several advantages as lower consumption of disposable mineral resources and energy, maximized utilization of potassic mineral resources, as well as clean productions etc. Based on the approaches presented in this paper, the technical system of efficiently utilizing insoluble potassium resources has been established. The hydrothermal alkaline methods are feasible to be industrialized on a large scale, thus resulting in decreasing imports of potash fertilizers, improving the pattern of potassium fertilizer consumption, and enhancing the supplying guarantee of potassium resource in China.

关键词： K-feldspar potassium salt alkaline digestion green processing sustainable development

Preparation,Crystal Structure,Thermal Decomposition and Explosive Properties of K_2(tza)_2(H_2O) (tza=Tetrazole-1-acetic Acid)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2011年第3期30卷 431-437页

作者：武碧栋张国涛张同来杨利张建国周遵宁郁开北 State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology The 42nd Institute of the Fourth Academy of CASC

A new energetic compound based on the tetrazole-1-acetic acid （tza） and potassium（I） salt, K2（tza）2（H2O）, was synthesized and characterized by elemental analysis and FT-IR spectrum. Its crystal structure was determined by single-crystal X-ray diffraction analysis. The results show that the crystal belongs to the orthorhombic system, space group Pna21 with a = 1.11972（17） nm, b = 0.46647（7） nm, c = 2.5158（4） nm, V = 1.3140（3） nm3, K2C6H8N8O5, Mr = 350.40 g·mol-1, Dc = 1.771 g·cm^-3, μ（MoKα） = 0.759 mm^-1, F（000） = 712, Z = 4, R = 0.023 and wR = 0.0527 for 2961 observed reflections （I 〉 2σ（I））. The K（I） cation is six-coordinated with four O atoms from three carboxylate groups, one O atom from one H2O molecule and one N atom from tetrazolyl ring, in which each tza is coordinated in a tridentate chelating bridging coordination mode. The thermal decomposition mechanism of the title complex was studied by DSC and TG-DTG techniques. Under nitrogen atmosphere at a heating rate of 10 K·min-1, the thermal decomposition of the complex contains one main exothermic process between 191.7 and 243.8 ℃ in the DSC curve. Its combustion heat was mensurated by oxygen bomb calorimetry. The non-isothermal kinetics parameters were calculated by the Kissinger＇s method and Ozawa-Doyle＇s method, respectively. The sensitivity properties of K2（tza）2（H2O） were also determined with standard methods, which was very sensitive to flame.

关键词： potassium salt tetrazole-1-acetic acid crystal decomposition sensitivity

Phase Equilibria in the Ternary Systems KBr–K_2B_4O_7–H_2O and KCl–K_2B_4O_7–H_2O at 373 K

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第6期87卷 1668-1673页

作者： CUI Ruizhi SANG Shihua HU Yongxia HU Jiawen College of Materials Chemistry & Chemical Engineering Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions College of Resources Shijiazhuang University of Economics

According to the compositions of the underground gasfield brines in the west of Sichuan Basin,the phase equilibria in the ternary systems KBr-K2B4O7-H2O and KCl-K2B4O7-H2O at 373 K were studied using the isothermal dissolution equilibrium *** solubilities of salts and the densities of saturated solutions in these ternary systems were *** the experimental data,phase diagrams and density-composition diagrams were *** two phase diagrams were simple co-saturation type,each having an invariant point,two univariant curves and two crystallization *** equilibrium solid phases in the ternary system KBr-K2B4O7-H2O are potassium bromide （KBr） and potassium tetraborate tetrahydrate （K2B4O7·4H2O）,and those in the ternary system KCl-K2B4O7-H2O are potassium chloride （KCl） and potassium tetraborate tetrahydrate （K2B4O7·4H2O）.Comparisons of the phase diagrams of the two systems at different temperatures show that there is no change in the crystallization phases,but there are changes in the size of the crystallization *** temperature increases,the solubility of K2B4O7·4H2O increases rapidly,so the crystallization field of K2B4O7·4H2O becomes smaller.

关键词： Underground brine phase equilibrium solubility potassium salt borate

Non-isothermal Decomposition Kinetics of K(AHDNE)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第5期28卷 878-881页

作者： LU Lei XU Kang-zhen QIU Qian-qian WANG Gang SONG Ji-rong ZHAO Feng-qi College of Chemistry and Chemical Engineering Yan'an UniversityYan'an 716000P.R.China School of Chemical Engineering Northwest UniversityXi'an 710069P.R.China Xi'an Modern Chemistry Research Institute Xi'an 710065P.R.China

The thermal behavior and non-isothermal decomposition kinetics of 1-amino-1-hydrazino-2,2-dinitro-ethylene potassium salt[K（AHDNE）] were studied under the non-isothermal conditions by different scanning calorimeter（DSC） method. The thermal behavior of K（AHDNE） presents three exothermic decomposition processes. The kinetic equation of the first thermal decomposition reaction obtained is dα/dT=（1019.63/β）3（1-α）[-ln（1-α）]2/3exp（-1.862× 105/RT）. The self-accelerating decomposition temperature（TSADT） and critical temperature of thermal explosion（Tb） of K（AHDNE） are 162.5 and 171.4 °C, respectively. K（AHDNE） has higher thermal stability than AHDNE.

关键词： 1-Amino-1-hydrazino-2 2-dinitroethylene(AHDNE) potassium salt Non-isothermal decomposition kine- tics

Solid-liquid Equilibria in the Quaternary System Na＋, K＋//Br-, B4O72--H2O at 298 K

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2014年第5期30卷 844-847页

作者： CUI Ruizhi College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 P R. China Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions Chengdu 610059 P. R. China

According to the compositions of the underground gasfield brines in the west of Sichuan Basin, the solu- bilities and densities of the solid-liquid equilibria in the quaternary system Na＋, K＋//Br-, B4O72--H2O at 298 K were determined by the method of isothermal solution saturation. From the experimental data, the phase diagram, water content diagram and density-composition diagram were obtained. This quaternary system is of simple eutectic type, without double salt and solid solution. There are two invariant points, five univariant curves, four fields of crystalli- zation in the system. The equilibrium solid phases are Na2BaO7·10H20, K2B4O7·4H2O, NaBr·2H2O and KBr. Na2B4O7·10H2O has a larger crystallization field, and NaBr·2H2O has a smaller crystallization field. It is also found that bromide has the salting-out effect on borate in the quaternary system Na＋, K＋//Br-, B4O72--H2Oat 298 K.

关键词： Underground brine Phase equilibrium Solubility potassium salt Borate Bromide