Investigation of Hydrometallurgical Processing of Titanomagnetite Ore Enrichment Waste

2020 ◽  
Vol 299 ◽  
pp. 1115-1120
Author(s):  
E.S. Makhotkina ◽  
M.V. Shubina ◽  
I.G. Shubin

In the article the negative impact of titano-magnetite ore enrichment waste on the environment and the possibility of its use as vanadium-containing raw materials are overviewed. The chemical and mineralogical composition features of various samples of the Kusinsky deposit titanomagnetite ore tails are presented. Different combinations of their roasting processes (with and without salt additives, with oxides, carbonates, or their compositions) and leaching processes (with water or acid) during hydrometallurgical processing were analyzed.The experiment results on the extraction of vanadium in the form of soluble vanadates from the titanomagnetite ore tails by leaching from samples subjected to roasting with soda ash, sodium sulfate, calcium oxide, and sodium chloride in various mass ratios are presented. The significant influence of ore sample chemical composition on the vanadium extraction degree was revealed. It was revealed that for this type of vanadium raw material additives of sodium chloride and sodium carbonate are most preferable from the vanadium extraction degree point of view.

Author(s):  
E. S. Makhotkina ◽  
M. V. Shubina

The actuality of exhausted of titanium-magnetite ore deposits wastes is stipulated not only by necessity of their negative impact on environmental elimination, but also by a possibility of application of these wastes as vanadium-containing raw materials. Analysis of existing technological processes for vanadium extraction accomplished. A possibility of vanadium extraction out of Kusinsky deposit titanium-magnetite ore tails studied. Results of experiments on vanadium extraction as soluble vanadates by leaching from the samples after roasting with soda ash, sodium sulfate, calcium oxide, and sodium chloride in various mass ratios presented. It was determined, that additives of sodium chloride and sodium carbonate are the most effective reagents for roasting of this type of vanadium raw materials. A significant effect of titanium-magnetite ore tails chemical composition on the vanadium extraction degree revealed: with an increase content from 0.15% to 0.53% in the ore tails vanadium, the extraction degree increases to 74.8%. When using the sodium chloride reaction additive, it is possible to leach in only one stage using sulfuric acid. Increasing the sodium chloride amount in the roasting mixture leads to a significant increase in the vanadium extraction degree in the leaching solution.


2017 ◽  
Vol 265 ◽  
pp. 994-998 ◽  
Author(s):  
E.S. Makhotkina ◽  
M.V. Shubina

The causes of the global vanadium consumption increase are described and new applications of this metal are given in the article. The main natural sources of vanadium are titanomagnetite, which is a strategic mineral raw material. The current volumes of vanadium extraction from natural raw materials do not match the demand of the market. Therefore there is an urgent need for recycling of secondary and technogenic sources. Partially the basic existing technologies processing vanadium-containing waste are reviewed. The effect of these wastes on the environment and human health is analyzed. The importance of vanadium steel slag recycling for the ecological state of industrial regions, resource-efficiency in expanding the raw material sources of vanadium and reducing the cost of steel production in general is shown. The results of studies on the extraction of vanadium in the form of soluble vanadate of metallurgical vanadium slag using hydrometallurgical processing are demonstrated. The analysis of the received values of the vanadium extraction degree was conducted. The influence of various factors on the completeness of extraction was examined. A significant influence on the vanadium extraction degree of slag chemical composition, the ratio of slag and alkaline additives in the charge, conditions of roasting and leaching was revealed.


2020 ◽  
Vol 10 (18) ◽  
pp. 6222 ◽  
Author(s):  
Girts Bumanis ◽  
Jelizaveta Zorica ◽  
Diana Bajare

The potential of phosphogypsum (PG) as secondary raw material in construction industry is high if compared to other raw materials from the point of view of availability, total energy consumption, and CO2 emissions created during material processing. This work investigates a green hydraulic ternary system binder based on waste phosphogypsum (PG) for the development of sustainable high-performance construction materials. Moreover, a simple, reproducible, and low-cost manufacture is followed by reaching PG utilization up to 50 wt.% of the binder. Commercial gypsum plaster was used for comparison. High-performance binder was obtained and on a basis of it foamed lightweight material was developed. Low water-binder ratio mixture compositions were prepared. Binder paste, mortar, and foamed binder were used for sample preparation. Chemical, mineralogical composition and performance of the binder were evaluated. Results indicate that the used waste may be successfully employed to produce high-performance binder pastes and even mortars with a compression strength up to 90 MPa. With the use of foaming agent, lightweight (370–700 kg/m3) foam concrete was produced with a thermal conductivity from 0.086 to 0.153 W/mK. Water tightness (softening coefficient) of such foamed material was 0.5–0.64. Proposed approach represents a viable solution to reduce the environmental footprint associated with waste disposal.


2008 ◽  
Vol 59 (2) ◽  
pp. 129-134
Author(s):  
Ion Teoreanu ◽  
Roxana Lucia Dumitrache ◽  
Stefania Stoleriu

Any change of the raw material sources for glazes, economically, ecologically motivated, and also from the glaze quality point of view, is conditioned by the molecular formula rationalization and by the variation limits of the molecular formula, respectively. The proper glaze compositions are placed within their limit variation intervals with optimized processing and utilization properties. For this purpose, the rationalization criteria and procedures of molecular formulas are summarized in the present paper, as well as the results referring to their rationalization obtained in the authors� previous work. Thus, one starts from a base of raw materials that are selected, usable and also accessible for the design and producing of the glazes. On these bases the groundwork and the design equation for the glaze recipes are developed, exemplified for a single glaze. For an easy access to results, computer programs are used for an easy access to results.


2021 ◽  
pp. 47-50
Author(s):  
Антонина Григорьевна Чернобровина ◽  
Наталья Николаевна Роева ◽  
Наталия Евгеньевна Куликова ◽  
Ольга Юрьевна Попова

В настоящее время к одним из наиболее приоритетных направлений пищевой промышленности относят разработку функциональных продуктов питания на основе экологически чистого сырья естественного происхождения, в том числе ягодного. При разработке новых продуктов с защитными свойствами важно учитывать ингредиентный состав сырья, оказывающий лечебно-профилактический эффект, и с этой точки зрения ягоды малины и брусники заслуживают особого внимания. С целью максимального извлечения и сохранения природных, физиологически-функциональных компонентов дикорастущих ягод (витаминов, микро- и макроэлементов, фенольных, пектиновых соединений и др.) были разработаны и созданы мультиэнзимные композиции для предобработки ягод брусники (МЭКб) и малины (МЭКм). Большой интерес вызывали исследования состава и содержания красящих веществ в исследуемых образцах. В качестве структурных элементов антоцианов в соке малины и брусники, а также в их ферментативных соках установлены дисахариды, основной структурный компонент которых - цианидин. Количественное содержание антоцианов в соке брусники и малины составило 305,4 и 106,2 мг/дм3, а в ферментативном соке брусники (БФС) и малины (МФС) - 553,7 и 146,4 мг/дм3, соответственно. Высокое содержание красящих веществ - важный критерий для использования БФС и МФС в качестве источника натуральных красителей. Установлена более высокая антиоксидантная активность в БФС и МФС (соответственно в 1,3 и 1,5 раза) по сравнению с соком, полученным без применения ферментных препаратов. Следовательно, ферментативный сок ягод обладает высокими антиоксидантными свойствами и служит источником натуральных красителей, поэтому его можно рассматривать как перспективный сырьевой полуфабрикат при производстве продуктов питания функциональной направленности, оказывающих благотворное регулирующее действие на организм человека. Currently, one of the priority areas of the food industry is the development of functional food products based on environmentally friendly raw materials of natural origin, including berry. When developing new products with protective properties, it is important to take into account the ingredient composition of the raw materials, which has a therapeutic and prophylactic effect, and from this point of view, raspberries and lingonberries deserve special attention. In order to maximize the preservation and extraction of natural, physiologically functional components of wild berries (vitamins, micro - and macroelements, phenolic compounds, pectin and other substances) were developed and created multienzymatic compositions for the pretreatment of lingonberry (MEKb) and raspberry (MEKm). Of great interest were studies on the characterization and content of dyes in the samples being studied. As structural elements of anthocyanins in raspberry and lingonberry juice, as well as in their enzymatic juices, disaccharides were established, the main structural component of which is cyanidine, and the quantitative content of anthocyanins (mg/dm3) in the juice of lingonberry and raspberry, corresponded - 305.40 and 106.20, and in the enzymatic juice of lingonberry and raspberry - 553.70 and 146.40. The high content of dyes is an important criterion for the use of BFS and MFS as a source of natural dyes. A higher antioxidant activity was found in BFS and MFS (1.3 and 1.5 times, respectively) compared with juice obtained without the use of enzyme preparations. Therefore, the enzymatic juice of berries has high antioxidant properties and is a source of natural dyes, so it can be considered as a promising raw material in the production of functional foods that have a beneficial regulatory effect on the human body.


2012 ◽  
Vol 42 (4) ◽  
pp. 283-294
Author(s):  
Ľudovít Kucharič ◽  
Vladimír Bezák ◽  
Dušan Majcin ◽  
Ján Vozár

Abstract A positive gravity anomaly was observed in the Flysch belt realm. Based on this fact and available geological knowledge we suppose that the source of gravity anomaly might be carbonate rocks lying perhaps in the footwall of Flysch sediments. The carbonates belong perhaps to the Penninic crust cover (a part of Klippen belt), or to lower structural stage of the Flysch belt. Besides this it is interpreted more volume of Neogene subvolcanic bodies in the frame of the Flysch belt based on the results of the newest magnetic measurements in the NE part of Slovakia (Kucharič et. al., in press). These are accompanied by increasing heat flow and hydrothermal alteration within neighbouring rocks what may eventuate into creation of raw materials. These two factors - carbonates and subvolcanic bodies - are important items for appraisal of new perspective in this area not only from hydrocarbon occurrences point of view (a primary intend within this area) but also for enhancement of geothermal potential of Slovak Republic and opening possibilities for prognosis of raw material occurrences as well.


2019 ◽  
Vol 73 (4) ◽  
pp. 265-274
Author(s):  
Slavica Mihajlovic ◽  
Zivko Sekulic ◽  
Jovica Stojanovic ◽  
Vladan Kasic ◽  
Iroslav Sokic ◽  
...  

Quality of raw materials, including quartz sand and quartzite, varies from one deposit to another. Furthermore, the material quality determines in which industrial branches it can be used after certain preparation processes. Potential applications of quartz raw materials are: in the construction and refractory industry, ceramics and glass industry, then in metallurgy, foundry and also in production of water treatment filters. Geological investigations of the central Serbia region, in the Rekovac municipality, resulted in identification of occurrence of quartz sand ("Ursula") and quartzite ("Velika Krusevica"). Preliminary laboratory tests and characterization of the quartz sand size fraction -0.63+0.1 mm confirmed the possibility of applying this size fraction in the construction materials industry, while the quartzite can be used in refractory, glass and metallurgy industries. After determining the geological reserve of quartz sand "Ursula" and quartzite "Velika Krusevica", detailed investigations are required. Quality conditions from the aspect of chemical composition and physical properties of quartz sand and quartzite are mostly clearly defined by a special standard for this purpose. On the other hand, there are also application areas where standards does not exist, but users define their quality conditions. This example is with the application of quartz sand in the production of water glass. Chemical composition as well is not always the determining factor for the application of quartz raw material. For example, for quartz sand used for sandblasting, grain form is essential. From the economic analysis point of view, the prices of quartz raw materials vary depending on their chemical and physical properties. After all, what needs to be pointed out is the fact that these raw materials are very widespread in nature and that their exploitation is quite simple. After the raw material is excavated, it is stored and further sieved, washed, dried and processed according to customer requirements. All of these processes are cheaper than preparing, for example, limestone, and significaly cheaper than preparation of metal ores.


2021 ◽  
Vol 10 (1) ◽  
pp. 1-7
Author(s):  
Herliati Rahman ◽  
Akhirudin Salasa

Currently, the use of alternative fuels and raw materials (AFR) in the cement industry is very attractive. This is driven by demands for environmental sustainability and the efficiency of fuel and raw material costs. One of the materials that can be used as AFR is sludge oil. However, it needs to be ensured that the chlorine content in the sludge oil does not exceed the threshold so that it does not have a negative impact during the cement production process. It is known that if the chlorine content is more than the threshold, it can cause blocking or clogging of the separator and the kiln. This study aims to determine the performance of the Jena Multi EA 4000 instrument in determining the chlorine content in sludge oil quickly and accurately. Analytic Jena Multi EA 4000 is an Atomic Absorption Spectrometers (AAS) instrument that can be used for analysis of samples in the form of solids or slurries containing chlorine. As validation of the resulting analysis, the wet method is used, which as usual, to determine chlorine levels. From the statistic analysis, namely the F-test and T-test, We found that F-count equal to 0.0080 and F-table equal to 4.2839. it shows that F-count < F-table, indicating the difference in the variance of the two methods H0: s12 = s22 is accepted because there is no difference to the variability of these two tests and the value of T-count = -3.9717 and T-table = 2.1788 so that T-count <T-table is accepted because there is no difference in the average accuracy of the two methods H0: M1 = M2.  


2020 ◽  
Author(s):  
Sara Daffara ◽  
Gabriele L.F. Berruti ◽  
Marta Arzarello

The Ciota Ciara cave is a Middle Palaeolithic site located in Piedmont (north-western Italy) and it is the only one systematically investigated in the region. It opens at 670 m a.s.l. on the west side of Monte Fenera and its archaeological deposit has a stratigraphic sequence documenting several and repeated human frequentations. Four archaeological layers have been identified (13, 14, 15 and 103) and are characterized by lithic assemblages where vein quartz is the main exploited raw material. The upper level (13), was already subject to technological and functional studies but the enlargement of the excavated area made necessary a completion of the technological data. The aim of this work is to deal with a complete technological and functional study of the lithic assemblage of the four archaeological layers of the Ciota Ciara cave to face the issues of predetermination and adaptation of the reduction sequences to the raw materials features. The technological analysis is based on the concept of chaîne opératoire and refers to the classical definitions of the S.S.D.A., discoid and Levallois methods for the identification of the different exploitation strategies. The concepts of curated and expedient technology are also applied to the present study. We finally refer to the huge debate concerning the concept of predetermination related to cores that show reduced or none phases of core configuration for the analysis and interpretation of the considered lithic assemblage.The results obtained show that the general behaviour can be interpreted as expedient, both from a technological and a functional point of view. The Middle Palaeolithic hunter-gatherers of the Ciota Ciara cave adapted their “technological background” to the resources available and put into action flexible adaptation strategies. Even in the shortness or absence of phases of core configuration, predetermination can be observed in the adaptation of Levallois and discoid concepts to the natural constraints of the pebbles chosen as cores. The natural convexities are exploited to obtain Levallois and discoid flakes after an intentional choice made by the knappers. In order to deeply investigate the characteristics of the technological behaviour of the hunter-gatherers that inhabited the site, the use-wear analysis is a fundamental additional source of information and it is here aimed to understand if there is or not a differential use of the lithic artefacts according to their typology and/or to the knapping method.


2021 ◽  
Vol 15 (1) ◽  
Author(s):  
M. Golovko ◽  
T. Golovko ◽  
A. Pak ◽  
L. Krykunenko

The expediency of improving the technological methods of processing unprofitable small fish and expanding the range of food products from them is substantiated. It is proposed to enrich the meat of freshwater fish with trace elements by adding to salt or brine during the salting of raw materials dietary supplements based on chelate complexes. The kinetics of penetration of micronutrients of a dietary supplement based on a chelate complex into the muscle tissue of crucian carp was studied by electronic paramagnetic resonance. The ambassador was held in three ways. According to the first dry method of salting, the fish was mixed with sodium chloride NaCl with the addition of a dietary supplement based on a chelate complex in the amount of 20… 25% and 0.1% by weight of raw materials, respectively. According to the second brine method, the fish was salted in brine, which was a solution of sodium chloride NaCl in the amount of 2 kg of salt per 1 kg of raw material. The amount of dietary supplement based on the chelate complex was 0.1% by weight of raw materials. According to the third method, the ambassador was carried out in brine with the same concentrations of sodium chloride and dietary supplements, but previously the fish raw materials were treated with ultrasound. Salting of fish was carried out for 6 days. The distribution of Mn ions in the plane (i, j) is investigated. The kinetics of the penetration of a microelement into the volume of crucian muscle tissue was studied by the EPR method. The kinetics of Mn2 + ion distribution in the studied muscle tissue samples and the tomogram of these surfaces were determined. The values of the area under the EPR spectra are normalized to the values of the area under the maximum EPR signal. For the maximum EPR signal for dry pickling, the signal from the liquid in which the raw material was during salting, and during the brine - the signal from the brine sample was selected. It is noted that the kinetics of penetration of the trace element is determined by the area of contact of the raw material with diffusing substances and the method of intensification of the internal transfer of these substances within the raw material. It was found that for brine and brine with pre-sonication, the amount of trace element in the depth of the crucian muscle tissue differs within the error. This indicates the homogeneity of the distribution of the trace element of the dietary supplement based on the chelate complex by such methods of salting.


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