Experimental Study of Purifying Precipitated Silica Produced from Yellow Phosphorus Slag

2012 ◽  
Vol 455-456 ◽  
pp. 503-506 ◽  
Author(s):  
Guo Bing Li ◽  
Hai Lin ◽  
Yan Li Ma ◽  
Yi Su
Keyword(s):  
Experimental Study ◽  
Nitric Acid ◽  
Reaction Time ◽  
Nitric Acid Concentration ◽  
Acid Leaching ◽  
Quality Requirements ◽  
Solid Ratio ◽  
Precipitated Silica ◽  
Yellow Phosphorus ◽  
Fe Content

When precipitated silica was prepared from yellow phosphorus slag by the phosphoric acid leaching, the Fe content can not meet the quality requirements of the product. This article indicates the method of purifying precipitated silica with nitric acid solution, which may decrease the Fe content to about 0.02%. The purification optimum technical conditions are: the nitric acid concentration 8%, reaction time 2.0 hours, reaction temperature 343.15K, fluid solid ratio 4:1, stirring speed 300 rpm.

Polymetallic Ore Concentration Middlings Nitric Acid Leaching Kinetics

2017 ◽  
Vol 265 ◽  
pp. 1065-1070 ◽  
Author(s):  
D.A. Rogozhnikov ◽  
B.V. Kolmachikhin
Keyword(s):  
Nitric Acid ◽  
Nitric Acid Concentration ◽  
Acid Leaching ◽  
Numerical Differentiation ◽  
Phase Reaction ◽  
Leaching Kinetics ◽  
Reaction Products ◽  
Mathematical Methods ◽  
Kinetic Evaluation ◽  
Nitric Acid Leaching

The purpose of this work is the kinetic evaluation of reactions occurring during nitric acid leaching of pollymetallic sulfide middlings, for the most complete translation of copper, zinc and sulfur in solution and concentration of precious metals in residue. Methodology is pollymetallic sulfide middlings nitric acid leaching kinetics were studied using mathematical methods such as the experimental data numerical differentiation. Relevance/value is the main sulfide minerals kinetic characteristics were obtained for the studied materials, including the rate of the process, order of reaction, the rate constant for the forward and reverse reaction. Findings are the rate of the process is limited by kinetics. The calculated values of kinetic parameters showed that the process kinetics are influenced by such factors as the nature of leachable sulfide, nitric acid concentration, the surface area of the solid sulfide, the system approaches equilibrium at saturation of the liquid phase reaction products.

scholarly journals Liberation of Gold Using Microwave-Nitric Acid Leaching and Separation-Recovery of Native Gold by Hydro-Separation

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 327 ◽  
Author(s):  
Kang Hee Cho ◽  
Jong Ju Lee ◽  
Cheon Young Park
Keyword(s):  
Electron Microscope ◽  
Nitric Acid ◽  
Native Gold ◽  
Nitric Acid Concentration ◽  
Acid Leaching ◽  
Sulfide Minerals ◽  
Separation Process ◽  
Insoluble Residue ◽  
Nitric Acid Leaching ◽  
Scanning Electron

The purpose of this study was to liberate gold from sulfide minerals in a gold concentrate through microwave-nitric acid leaching and to separate the light minerals in an insoluble residue using a hydro-separation process. The representative sulfide minerals in the gold concentrate were pyrite with minor galena. Mineralogical characterization was conducted on the gold concentrate using 1715.20 g/t based on lead-fire assays. During the leaching experiment, the effect of nitric acid concentration was studied. The results indicated that the metal leaching rate of the gold concentrate increased with increasing nitric acid concentration. After the microwave-nitric acid leaching, the resulting main feature was consistent with the increased exposure to reactive sulfide minerals and decrease in weight. Characterization techniques such as X-ray diffraction (XRD), scanning electron microscope energy dispersive spectroscopy (SEM-EDS) and scanning electron microscope backscattered electron imaging (SEM-BSE) were performed to characterize the minerals in the insoluble residue using microwave-nitric acid leaching and the hydro-separation process. The XRD patterns of the insoluble residues were compared. The intensities of the pyrite peak decreased and disappeared under different nitric acid concentrations, whereas intensities of the quartz peak increased. The hydro-separation process focused on the separation of heavy (e.g., native gold) and light (e.g., quartz) minerals from the insoluble residues. After the hydro-separation treatment process, the heavy minerals exhibited typical diffraction lines of gold, as obtained using the XRD analysis.

Synthesis of N-Butyl Propionate Catalyzed by Multi-Walled Carbon Nanotubes Loaded Cerous Sulfate

2011 ◽  
Vol 197-198 ◽  
pp. 765-769
Author(s):  
Bo Quan Jiang ◽  
Yu De Liu ◽  
Jiang Nan Zeng ◽  
Min Wei Wang
Keyword(s):  
Carbon Nanotubes ◽  
Nitric Acid ◽  
Reaction Time ◽  
Nitric Acid Concentration ◽  
Butyl Alcohol ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
Experiment Method ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes ( MWCNTs) was used, as a catalyst carrier, to load cerous sulfate for catalyzing the synthesis of n-butyl propionate. The effects of nitric acid concentration, reaction time and reaction temperature on the purification of MWCNTs were investigated. The effects of molar ratio of butyl alcohol to propionic acid, the cerous sulfate load and the reaction time on the conversion of butyl acid were studied by single factor experiment method and orthogonal experiment method, respectively. The results show that the optimal conditions for purifying MWCNTs are: nitric acid concentration of 4 M, reaction time of 8 h and reaction temperature of 103°С and the optimal conditions for synthesizing n-butyl propionate are: molar ratio of butyl alcohol to propionic acid of 1.5:1, use level of loaded cerous sulfate of 0.15 g and reaction time of 70 min. The conversion of butyl acid for the MWCNTs loaded cerous sulfate reaches 96.7% which is higher than that for the unloaded cerous sulfate and the use level of cerous sulfate for the former is much less than that for the latter under same operation conditions.

scholarly journals ДОСЛІДЖЕННЯ ПРОЦЕСУ НІТРАТНОКИСЛОТНОЇ ПЕРЕРОБКИ ФОСФОГІПСУ З ОДЕРЖАННЯМ КОНЦЕНТРАТУ РІДКІСНОЗЕМЕЛЬНИХ ЕЛЕМЕНТІВ

2021 ◽  
Vol 146 (3) ◽  
pp. 186-195
Author(s):  
О. В. Назаренко ◽  
А. В. Іванченко ◽  
О. Ю. Колєснікова
Keyword(s):  
Rare Earth ◽  
Nitric Acid ◽  
Rare Earth Elements ◽  
Acid Concentration ◽  
Experimental Studies ◽  
Nitric Acid Concentration ◽  
Acid Leaching ◽  
Technical Literature ◽  
Acid Processing ◽  
Degree Of Extraction

Investigate the process of extraction of rare earth elements from phosphogypsum by its interaction with nitric acid, concentration 25, 30 and 35%, at a ratio of "phosphogypsum: acid" 1: 2 and a temperature of 700C to obtain purified calcium sulfate. Regularities of the process of extraction of concentrate of rare earth elements from phosphogypsum by acid leaching are obtained. Experimental studies were performed using the titrimetric method using Trilon B to determine the concentration of rare earth elements in the obtained filtrates. A review of scientific and technical literature in the field of promising methods of processing phosphogypsum. The most alternative method of processing phosphogypsum is to obtain rare earth elements by acid leaching, which is provided by the use of mineral acids. Based on the obtained data, it was found that when the acid concentration increases from 25 to 35%, the content of rare earth elements (REE) in the filtrates of the samples increases from 0.21 to 1.68 g/dm3, respectively. It was found that the degree of extraction of REE concentrate from phosphogypsum is highest at an acid concentration of 25% and is 22.8%, and with increasing concentration of HNO3, it decreases by almost 2.5 times. The optimal concentration of the nitric acid solution was determined, which is 25% and interacts with phosphogypsum for the subsequent extraction of the precipitate of rare earth elements.The optimal temperature of nitric acid processing of phosphogypsum, which is 70 0C, was revealed. Regularities of the process of extraction of concentrate of rare earth elements from phosphogypsum by acid leaching are obtained.The use of nitric acid for the production of rare earth elements from phosphogypsum and for the production of purified phosphogypsum sediment from soluble impurities scientifically substantiated. The content of rare earth elements in the filtrate was determined at various acid concentrations. The efficiency of sediment removal of rare earth elements from phosphogypsum by interaction with nitric acid at a concentration of 25, 30 and 35%, respectively, was established. Purified phosphogypsum can then be used to produce gypsum binder in the construction industry and in fertilizer technology in agriculture. Concentrate of rare earth elements can be used in medicine, metallurgy and other industries with the selection of individual elements and in general.

Hydrochemical Investigation of Dissolving Sulfide Gold-Bearing Raw Material of Uderey Deposit

2019 ◽  
Vol 946 ◽  
pp. 535-540
Author(s):  
Oleg A. Dizer ◽  
Denis A. Rogozhnikov ◽  
Stanislav S. Naboichenko
Keyword(s):  
Nitric Acid ◽  
Nitric Acid Concentration ◽  
Raw Material ◽  
Experiment Planning ◽  
Mathematical Experiment ◽  
Solid Ratio ◽  
Level Model ◽  
Chemical And Phase Compositions ◽  
Main Components ◽  
Gold Bearing

This article describes a method for the hydrochemical dissolution of a sulfide gold-bearing raw material from the Uderey’s deposit using nitric acid. The chemical and phase compositions of the studied material, mainly represented by compounds of silicon, sodium, arsenic, iron and sulfur, are investigated. Phase composition: pyrite, arsenopyrite, quartz, thenardite. The dependences of the influence of temperature, time, and the liquid to solid ratio on extracting the main components in the solution were determined by methods of mathematical experiment planning. The calculated values ​​of the determination coefficients testify to the adequacy of the chosen two-level model. The optimum parameters of the process were obtained: L/S ratio = 8; the nitric acid concentration was 6 M; experiment duration was 75 minutes.

scholarly journals Nitric acid leaching of polymetallic middlings of concentration

2013 ◽  
Vol 54 (6) ◽  
pp. 440-442 ◽  
Author(s):  
D. A. Rogozhnikov ◽  
S. V. Mamyachenkov ◽  
S. V. Karelov ◽  
O. S. Anisimova
Keyword(s):  
Nitric Acid ◽  
Acid Leaching ◽  
Nitric Acid Leaching

Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore

2013 ◽  
Vol 734-737 ◽  
pp. 1033-1036
Author(s):  
Gui Fang Zhang ◽  
Peng Yan ◽  
Qing Rong Yang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Research Results ◽  
Solid Ratio ◽  
Leaching Residue

Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium entering into solution. The research results has shown that the scandium leaching rate could reach 92.06% under the optimal conditions which the hydrochloric acid concentration is 22.8%, the dosage of aid leaching agent is 6%, liquid solid ratio is 4:1, particle size of leaching material totally is less than 0.15mm and leaching time is 8h.

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