scholarly journals Separate deposition of metals from highly concentrated solutions with granulated magnesia-silicate reagent

Vestnik MGTU ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 118-130
Author(s):  
I. P. Kremenetskaya ◽  
T. K. Ivanova ◽  
B. I. Gurevich ◽  
A. I. Novikov ◽  
V. V. Semushin
Keyword(s):  
Nickel Content ◽  
Sulfate Solution ◽  
High Concentration ◽  
Metal Compounds ◽  
Magnesite Deposit ◽  
Multi Stage ◽  
Serpentine Minerals ◽  
Copper Zinc ◽  
Co Precipitation ◽  
Main Component

Multi-stage deposition of metals from a sulfate solution with a high concentration of iron, aluminum, copper, zinc, and nickel has been studied. The concentrations of the components correspond to the composition of the sub-basement waters of the Gaisky GOK. Granular magnesia-silicate reagent based on serpentinite (Khalilovsk magnesite deposit, the Orenburg region, Russia) has been used as an alkaline agent. The magnesia-silicate reagent's ability to reduce the acidity of solutions is due to the presence of products of destruction of the original serpentine mineral, mainly magnesium oxide. The results of the solutions multi-stage purification from metals simulation have been presented. It has been found that the reagent did not wholly exhaust its activity during a single contact with the solution. Therefore, the possibility of its repeated use for the 2nd and 3rd time has been studied. As the solution is neutralized according to the known pH range of the beginning and complete deposition of metal compounds, first iron, and then aluminum are deposited. For copper and nickel, the effect of co-precipitation is observed until the pH of precipitation of poorly soluble compounds is reached. Iron is the main component of precipitations at the 1st, 2nd, and 3rd stages, which corresponds to pH = 2.4-3.7. At the 4th stage (pH = 4.0), the precipitations consisted mainly of aluminum compounds. The copper and nickel content in precipitations increase due to decreased concentration of major components (aluminum and iron) and a pH increase. The deposition of zinc from the solution occurs not to the precipitations, but on the granules surfaces. Precipitations enriched in aluminum and iron have been obtained. Sorption and co-precipitation processes have been observed for copper, zinc, and nickel, which prevents individual precipitation by these metals. Thermally activated serpentine minerals can be considered a promising alkaline reagent for technogenic solutions neutralization and purification.

Mechanisms and Remediation Technologies of Sulfate Removal from Acid Mine Drainage

2012 ◽  
Vol 610-613 ◽  
pp. 3252-3256
Author(s):  
Mei Qin Chen ◽  
Feng Ji Wu
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Metal Corrosion ◽  
Sulfate Ion ◽  
High Concentration ◽  
Biological Reduction ◽  
Acid Mine ◽  
Sulfate Removal ◽  
Co Precipitation

Acid mine drainage (AMD) has properties of extreme acidification, quantities of sulfate and elevated levels of soluble heavy metals. It was a widespread environmental problem that caused adverse effects to the qualities of ground water and surface water. In the past decades, most of investigations were focused on the heavy metals as their toxicities for human and animals. As another main constitution of AMD, sulfate ion is nontoxic, yet high concentration of sulfate ion can cause many problems such as soil acidification, metal corrosion and health problems. More attention should be paid on the sulfate ion when people focus on the AMD. In the paper, sulfate removal mechanisms include adsorption, precipitation, co-precipitation and biological reduction were analyzed and summarized. Meanwhile, the remediation technologies, especially the applications of them in China were also presented and discussed.

Separation of Heavy Metal Ions from the Solution Obtained by Leaching Low-Grade Pyrolusite with Pyrite and H2SO4

2013 ◽  
Vol 773 ◽  
pp. 283-288
Author(s):  
Xing Zou ◽  
Xiang Quan Chen ◽  
Hai Chao Xie ◽  
Xiao Dan Qiu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Separation Efficiency ◽  
Ph Value ◽  
Sulfate Solution ◽  
Ion Concentration ◽  
Manganese Sulfate ◽  
Low Grade ◽  
High Concentration

The manganese sulfate solution leached from low-grade pyrolusite with pyrite and H2SO4 contains heavy metal ions of high concentration, influencing the quality of the final products of manganese compounds and causing manganese ions not to be electrolyzed. The present study was focused on the separation of Co, Ni and Zn ions from the leached solution with BaS. By controlling the pH value at 5.0-6.5, temperature at 50-60°C, reaction time at 15 min and mixing velocity at 78 rpm, the heavy metal ions could be separated effectively. Under the above optimized conditions, the ion concentration of Co, Ni, and Zn in the solution was reduced to 0.06 mg.L-1, 0.27mg.L-1 and 0.01mg.L-1, and the separation efficiency was 99.72%, 99.18% and 99.9% respectively. The obtained pure solution meets the demands of manganese electrowinning.

scholarly journals PROFITABILITY ANALYSIS OF MARKETING OF FROZEN FISH IN KADUNA METROPOLIS, KADUNA STATE, NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 577-583
Author(s):  
M. B. Usman ◽  
O. S. Aaasa ◽  
O. S. Balogun ◽  
U. F. Yahaya
Keyword(s):  
Tertiary Education ◽  
Primary Data ◽  
Integrated Marketing ◽  
High Concentration ◽  
Profitability Analysis ◽  
Multi Stage ◽  
Return On Capital ◽  
Result Show ◽  
Frozen Fish ◽  
The Cost

This study investigated the marketing of frozen fish in Kaduna metropolis, Kaduna state. Ten (10) markets were purposively selected due to high concentration of frozen fish marketers and the volume of trading activities; Primary data were generated through the use of structured questionnaire administered to hundred (100) randomly selected retailers and fifteen (15) purposively selected wholesalers. The data were analyzed using descriptive statistic, budgeting technique, net marketing and rate of return on capital invested. The result show that majority 80 percent and 53 of the retailers and wholesalers were female, Majority (70prcent) of the retailers had primary education but most of the wholesaler’s attained tertiary education. The frozen fish marketing channels identified in the area are made up of zero and multi stage channels. Furthermore, the cost and return analysis revealed that the wholesalers realized about N121, 000.00 naira while the retailers got N56, 000.00 naira per month while return to per capital invested (RPCI) was 11 kobo and 22 kobo per Naira invested for the wholesalers and the retailers respectively. This implies that the enterprise is profitable. Transportation difficulties and marketing charges ranked were major constraints confronting frozen fish marketers. It is recommended that provision of good roads network and formidable integrated marketing system will further improve the profitability of the enterprise in the study area.

scholarly journals Transmigrant Farmers Adaptation to Rainfed Rice Field and Irrigated Rice Field in North Luwu Regency, South Sulawesi - Indonesia

2015 ◽  
Vol 9 (12) ◽  
pp. 243
Author(s):  
Eliza Meiyani
Keyword(s):  
Quantitative Research ◽  
Rice Field ◽  
Irrigated Rice ◽  
Rainfed Rice ◽  
South Sulawesi ◽  
Multi Stage ◽  
The Social ◽  
Main Component Analysis ◽  
Basic Ability ◽  
Main Component

<p class="zhengwen"><span lang="EN-GB">This research is aimed to study the anthropology of transmigration, particularly on transmigrants' adaptation to different cultural background and environment of their new place. There are three analyzed variables in this research: the farmers' basic ability, culture (tradition), and motivation which might closely related to their adaptation capability in a new location. This is a quantitative research and it was conducted in Malangke District, North Luwu Regency, South Sulawesi. Multi-stage cluster random sampling was used as the sampling method. There were 400 samples taken in this study which consist of 200 farmers of rainfed ricefield and 200 farmers of irrigated rice field. The data was taken by conducting several interviews which are based on a question list and observation. Then the data was analyzed using factor (main component) analysis, path analysis, and product-moment correlation analysis. The result shows that transmigrants' adaptation capability is not influenced only by the new physical environment condition where they live, but also their origin as well as the social, economic, and cultural factors that become parts of their life.</span></p>

scholarly journals A fast-acting elastase inhibitor in human monocytes.

1985 ◽  
Vol 162 (6) ◽  
pp. 2142-2155 ◽  
Author(s):  
E Remold-O'Donnell
Keyword(s):  
Proteinase Inhibitor ◽  
Sodium Dodecyl ◽  
Human Monocyte ◽  
Sulfate Solution ◽  
Cell Protein ◽  
Human Monocytes ◽  
High Concentration ◽  
Elastase Inhibitor ◽  
Nucleophilic Cleavage ◽  
Fast Acting

A proteinase inhibitor active against neutrophil and pancreatic elastase was detected in extracts of cultured human monocytes and the human monocyte-like cell line U937. This component forms a covalent complex with the active site of elastase; the complex is stable in boiling sodium dodecyl sulfate solution, and is susceptible to nucleophilic cleavage. The activity of the elastase inhibitor is not detected in extracts of freshly isolated monocytes, but becomes detectable when the monocytes are allowed to mature in culture, with maximum levels occurring at 5-7 d. The monocyte inhibitor is fast-acting; its reaction with 125I-labeled elastase is complete in less than 1 min at 37 degrees C. Analysis by electrophoresis and studies using a heteroantiserum to alpha 1-proteinase inhibitor demonstrated that the elastase inhibitor of monocytes/U937 cells is not identical to alpha 1-proteinase inhibitor, the major elastase inhibitor of blood plasma. The extent of conversion of 125I-elastase to the 125I-elastase-inhibitor complex is proportional to the amount of U937 extract or cultured monocyte extract, indicating that this reaction can serve to quantify the elastase inhibitor. The elastase inhibitor is an abundant component in mature monocytes, with greater than or equal to 1.5 X 10(6) molecules/cell (greater than or equal to 12 micrograms per 10(8) cells, greater than 0.1% of total cell protein). Its mol wt is estimated at 50,000. Thus, the monocyte inhibitor should be classified as a putative regulator of neutrophil (and monocyte) elastase activity at inflammatory sites. This designation is based on the properties of the molecule, including its high concentration in maturing monocytes, its affinity for elastase, and its fast reaction with this enzyme.

scholarly journals Synthesis and characterization of a new hybrid TiO2/SiO2 filler for lithium conducting gel electrolytes

2010 ◽  
Vol 8 (6) ◽  
pp. 1311-1317 ◽  
Author(s):  
Mariusz Walkowiak ◽  
Monika Osińska ◽  
Teofil Jesionowski ◽  
Katarzyna Siwińska-Stefańska
Keyword(s):  
Vinylidene Fluoride ◽  
Sulfate Solution ◽  
Electrochemical Characteristics ◽  
Polymer Gel ◽  
Composite Polymer ◽  
Gel Electrolytes ◽  
Polymer Gel Electrolytes ◽  
Electrolyte Uptake ◽  
Li Ion ◽  
Co Precipitation

AbstractThis paper describes the synthesis and properties of a new type of ceramic fillers for composite polymer gel electrolytes. Hybrid TiO2-SiO2 ceramic powders have been obtained by co-precipitation from titanium(IV) sulfate solution using sodium silicate as the precipitating agent. The resulting submicron-size powders have been applied as fillers for composite polymer gel electrolytes for Li-ion batteries based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF/HFP) copolymeric membranes. The powders, dry membranes and gel electrolytes have been examined structurally and electrochemically, showing favorable properties in terms of electrolyte uptake and electrochemical characteristics in Li-ion cells.

Solvent extraction of copper, zinc, cadmium and nickel from sulfate solution in mixer settler unit (MSU)

2014 ◽  
Vol 122 ◽  
pp. 119-127 ◽  
Author(s):  
Manis Kumar Jha ◽  
Divika Gupta ◽  
Pankaj Kumar Choubey ◽  
Vinay Kumar ◽  
Jinki Jeong ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Sulfate Solution ◽  
Zinc Cadmium ◽  
Copper Zinc

Self-Cleaning TiO2/SiO2 Thin Film Prepared by a Simple Sol-Gel Method

2014 ◽  
Vol 804 ◽  
pp. 157-160
Author(s):  
Wen Xiu Liu ◽  
Jun Na Xu ◽  
Jun Zhang ◽  
Xue Mei Liu ◽  
Wen Bin Cao
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Sulfate Solution ◽  
Ultraviolet Region ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Titanyl Sulfate ◽  
Glass Substrates ◽  
Light Region ◽  
Vis Spectroscopy

TiO2 thin films were prepared on SiO2-coated glass substrates using sols deriving from high concentration titanyl sulfate solution by the spin-coating technique. The calcined films were characterized by X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy. The film exhibited high transmittance in the visible light region and high absorption in the ultraviolet region. The contact angle of SiO2/TiO2 decreased to below 5° under 30 min of UV light irradiation and can sustain for 1 weeks.

scholarly journals Investigation on ash fouling formation of induced fan blade and heat exchanger surface in a 1000MW coal-fired power plant

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3477-3488
Author(s):  
He-Xin Liu ◽  
Jia-Fan Xiao ◽  
Hou-Zhang Tan ◽  
Yi-Bin Wang ◽  
Fu-Xin Yang
Keyword(s):  
Heat Exchanger ◽  
Power Plant ◽  
Power Plants ◽  
High Concentration ◽  
X Ray ◽  
Low Emission ◽  
Fan Blade ◽  
Main Component ◽  
Ash Fouling ◽  
Heat Exchanger Surface

The control of fouling deposition on the main equipment has always been an im-portant issue concerned by scientific research and industrial application. How-ever, severe fouling deposits on the induced fan blade and the low temperature economiser were found in a 1000 MW coal-fired power plant with ultra-low emission. The deposit samples were collected and analysed through X-ray dif-fraction spectrometer, X-ray fluorescence, elemental analyser and SEM with en-ergy dispersive spectrometers. The result shows that the deposits are mainly composed of tschermigite (NH4)Al(SO4)2 ? 12H2O, letovicite (NH4)3H(SO4)2, cal-cium sulphate CaSO4, and quartz SiO2. The ammonium sulphate is the main component of the fouling deposits. It acts as an adhesive and makes an important contribution to the deposition. The analysis shows that the ammonia slip from denitrification system and the unreasonable temperature setting are the main reasons for fouling deposition. It is suggested that the high concentration of am-monium slip at denitrification system and the rapid condensation of the sulphuric acid mist at heat exchanger should be paid more attention in coal-fired power plants.

scholarly journals RESORT RESOURCES OF THE COUNTRY AS THE MAIN COMPONENT OF THE SYSTEM OF TOURIST LOCAL HISTORY

2021 ◽  
Vol 76 (3) ◽  
pp. 145-155
Author(s):  
Daryna A. Liuta ◽  
◽  
Eduard A Kryvolapov ◽  
Eugene G. Bortnikov ◽  
◽  
...  
Keyword(s):  
Supply And Demand ◽  
Local History ◽  
Hierarchical Level ◽  
High Concentration ◽  
Consumer Market ◽  
Settlement Systems ◽  
Production And Consumption ◽  
Territorial Structure ◽  
Main Component ◽  
Different Order

The resort is a narrowly specialized territorial entity with a relatively high concentration of relevant specialization functions (balneological, climatotherapeutic and others). The relative territorial homogeneity of resort resources contributes to the formation of areal forms − resort areas, districts and resort areas. That is, the elements that are formed by the subjects-producers of the producer's market, depending on the level of territorial specialization and concentration of tourist activity, can be divided into tourist-excursion and resort. That is, territorial structures are markets of supply of different hierarchical level, complexity and specialization, to which consumer flows are directed and which provide the process of consumption of tourist goods and a certain set of tourist services. The key elements of the territorial structure of the tourist market are the nodes (resorts). Thus, the geospatial structure of the market of tourist services is formed by both sides of the market − the consumer market, forming demand, localizes it in the elements of settlement systems, based on which the demand market is formed and to which the intermediary enterprises to specialization, is localized both in the elements of settlement systems, tending to the centers of concentration of demand, as well as in the territorial structures of different order and specialization, on the basis of which the supply market is formed. Therefore, the article singles out the main scientists who studied resort activities. Also, the article defines the purpose − the characteristics of resort resources as an important component of tourist science. After the study of the outlined problem, conclusions were made based on the objectives. It is determined that the market of tourist services is a system of multifaceted, polystructural, polyform and multilevel system, which operates according to the law of balancing supply and demand, which reproduces the objectively determined need for compliance in time and space. commodity supply, and operates on the basis of fluctuations in production and consumption of tourism products. And resorts in turn are an important element of the tourist market.Keywords: resorts, territorial structure, tourist market, tourism, tourist services.

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