Valuable Minerals Research Articles

ОПТИМИЗАЦИЯ ЛОГИСТИЧЕСКОЙ СХЕМЫ ДЛЯ ОБЕСПЕЧЕНИЯ РАЙОНОВ РЕСПУБЛИКИ ТАТАРСТАН УДОБРЕНИЯМИ ИЗ ОТХОДОВ ПТИЦЕВОДСТВА

The problem of poultry agroindustrial complex sector waste’s recycling, in particular, live activity’s waste products (poultry droppings), is considered. The technology of their utilization in gasification installation by airless, oxygenfree thermal decomposition to produce fuel gas and valuable mineral fertilizer - ash method using is proposed. The technology of waste (manure) gasification for its environmental friendliness due to the nitrogen absence at gasifying medium is known. Ash after unloading from the gasification plant can be used in agriculture as a mineral fertilizer with a high content of phosphorus and potassium. The ash, in turn, for a long time is stored and does not require special transportation conditions. The waste into a useful product’s conversion will allow poultry enterprises to eliminate environmental payments for negative environmental impacts. Poultry waste in areas that can be divided into three large centers is generated, the poultry waste gasification enterprises’ construction will be carried out and innovative technologies for its recycling will be introduced. Raw materials for large enterprises are supposed to be delivered by the cluster method from small ones. The product obtained after gasification must be known on the market and accessible through the transport’s network. A solution is also proposed to fertilizers imbalance’s eliminating on the Republic of Tatarstan districts example by transport routes optimizing from equidistant centers to all consumers organizing. The transport problem solving method to find the best schemes for fertilizers’ transporting to areas with the greatest deficit was used. A matrix of paired comparisons is presented, and the optimal transportation plan is calculated. The results show that the proposed routes and the transported fertilizers amount can the region’s situation with the fertilizers’ imbalance improving. This technique allows the regions’ agroindustrial sector due to the search and transportation to areas’ costs as to fertilization’s necessity optimizing.

Role of faults and tectonic blocks in the Daugiztau gold deposit, Uzbekistan

This article delves into the comprehensive study of geodynamics concerning ore formation within the local area of gold ore mineralization in the central KyzylKum province. The primary focus lies in understanding the influential role of faults and tectonic blocks in the distribution of gold mineralization at the Daugyztau ore field. Geodynamics, as a significant factor in ore formation processes, is driven by external forces and prominently characterized by the dynamic activity of faults and blocks.The central KyzylKum province is renowned for its rich gold deposits, and exploring the underlying geodynamic processes is crucial for deciphering the mechanisms behind the formation and distribution of these valuable mineral resources. The study aims to shed light on the relationship between geodynamic phenomena and gold mineralization within the Daugyztau ore field.One of the key aspects under investigation is the role of faults, which are fractures or discontinuities in the Earth's crust, in controlling the migration and concentration of gold-bearing fluids. These faults act as pathways and conduits for the transportation of hydrothermal fluids, facilitating the deposition of gold and other associated minerals. By analyzing the spatial distribution and characteristics of faults in the area, researchers can gain insights into the geological processes responsible for gold mineralization.

Geodynamic issues of ore deposits in Central Asia

The focus of this study is on a pressing issue in ore geology, specifically the geodynamics of ore formation. The paper delineates a comprehensive methodology for examining the geodynamic context in regions hosting endogenous mineralization. The foundation for reconstructing geodynamics lies in geological and structural investigations into the circumstances surrounding mineralization, complemented by outcomes from physical modeling. Tectonic tension and deformation analyses of ore fields and deposits further contribute crucial insights. The study underscores that understanding the geodynamic setting is paramount for elucidating the processes leading to ore formation. This involves a detailed examination of geological structures, conditions of mineralization, and physical modeling results. By adopting this approach, the research provides a robust framework for reconstructing the geodynamic conditions prevalent during the period of ore formation. As a practical application of this methodology, the paper presents results from the reconstruction of the geodynamic situation during the ore formation period in a gold deposit situated in Western Uzbekistan. These findings contribute to a deeper comprehension of the geodynamic processes associated with the formation of valuable mineral deposits, thereby enhancing our ability to interpret and potentially predict similar occurrences in ore geology.

Identifying Separation Potency and Relationship of Grade and Density of Copper Ore for Gravity-Based Early Coarse Gangue Rejection using Statistical Method

The mineral processing industry faces a pressing challenge of declining productivity, particularly in metal minerals production, driven by soaring operational costs, with crushing and grinding operations accounting for a substantial portion of the energy consumption. To mitigate these challenges, early gangue rejection or preconcentration is proposed as an effective solution. This approach involves the removal of non-valuable materials and the concentration of valuable minerals at the initial processing stages, leading to increased efficiency, higher ore feed grades, cost savings, and reduced environmental impact. Various methods for gangue rejection exist, with gravity-based separation and ore sorting being the predominant options. Gravity-based separation stands out for its simplicity and versatility, making it the preferred choice in many scenarios. This study introduces a novel approach for evaluating gangue rejection potential, optimizing data distribution, and generating theoretical separation potential curves that account for both grade and density criteria. These curves provide insights into material rejection, metal losses, and optimal separation points, offering valuable guidance for mineral processing operations. Additionally, the study investigates the correlation between raw ore grade and density data, highlighting a strong relationship across different size fractions. This finding suggests that gravity-based separation can effectively rely on both grade and density parameters, resolving previous disparities observed in distribution models. By shedding light on advanced gangue rejection strategies, this research contributes to improved productivity and informed decision-making in the mineral processing industry.

Soil Survey and Lithogeochemical Techniques in Mineral Exploration

This paper investigates the critical roles of soil surveys and lithologic evaluation in identifying potential mineral resources. Soil surveys involve the systematic mapping, examination, description, and classification of soils within a defined area. Through targeted sampling and laboratory analysis, these surveys can reveal the concentration of metals in the soil. By analyzing these metal signatures, geoscientists can infer the underlying geology and identify areas with a higher likelihood of hosting valuable mineral deposits. Lithologic evaluation complements soil surveys by focusing on the physical characteristics of rock units exposed at outcrops, in hand samples, or cores. Observable with the naked eye or a magnifying lens, these characteristics include color, texture, and structural features. Lithogeochemistry, or rock geochemistry, builds upon this foundation by analyzing the chemical composition of the bedrock. This analysis aims to identify spatial patterns of elements typically associated with specific types of mineral deposits. By integrating the findings from soil surveys and lithologic evaluations, geoscientists gain a comprehensive understanding of the subsurface environment, enabling them to prioritize areas for further mineral exploration activities. This paper delves into the fundamentals of these techniques, highlighting their strengths and limitations in the context of mineral resource exploration.

Exploring the effects of mineral depletion on renewable energy technologies net energy returns

The energy transition poses a set of new challenges related to mineral scarcity and depletion. The process of mineral depletion is characterised by increasing energy consumption per tonne of valuable minerals mined (i.e. energy intensity of mining), due to the decline in the quality of mined deposits. As renewable energy technologies are heavily reliant on a range of minerals, some of them scarce, the net energy returns (i.e., the share of energy available to provide energy services) of renewable energy technologies may be significantly affected by this decline. This may in turn jeopardise the ability of renewable energy technologies to provide sufficient net energy, and hence, support decent living standards. The aim of this article is therefore to explore, using net energy analysis techniques combined with Life Cycle Analysis data, the effects of mineral depletion on the net energy returns of four renewable energy technologies: solar photovoltaic, concentrated solar power, onshore wind, and offshore wind.The results indicate that the effects of mineral depletion on the net energy returns of renewable energy technologies will be marginal. Indeed, even for very high increases in the energy intensities of mining, the share of net energy returns decreases by less than 3 percentage points by 2060 for each technology analysed — 2.3% for wind offshore, 1.6% for solar photovoltaic and concentrated solar power, and 1.1% for wind onshore. These results are validated with a Monte Carlo simulation conducted on the energy intensities of mining. In addition, the article discusses that technological factors, such as improvements in metallurgical energy efficiencies and material intensities of manufacturing have the potential to somewhat offset the effects of mineral depletion. Hence, although constraints related to mineral scarcity and depletion may be critical for the energy transition, concerns regarding the impacts of these issues on the net energy returns of renewable energy appear to be unfounded.

From agricultural practices to mining activities: The consequences of this paradigm shift for the food security in Guinea

This study aims to analyse the effects that the mining activity exercises on agriculture and the livelihoods of local communities in the Republic of Guinea. Mining and agricultural activities are intertwined in such a way that the operation of one affects the other. Over the years, mining activities have been seen to negatively affect farming, livestock grazing and fisheries in the surrounding communities. Mining consists in the excavation of useful and economically valuable minerals from deposits in the earth. Despite its potential to generate a large amount of revenue, the mining sector is not adequately regulated, and as a consequence creates a ground for illegal mining activities. These activities, depending on the type of mining, have a spectrum of effects on agricultural activities including competition for land control and use, pollution of water bodies and exposure of crops and livestock to the harmful effects of heavy metals. The cumulative effects of these activities have modified the agricultural practices, disrupted landscapes, and negatively influence the availability of food crops in the areas where mining activities are carried out, which in turn threatens the food security of the region of Boké. This article also evaluates the impacts of mining on agricultural activities in the region, with a view of providing evidence for policymakers for taking necessary action and foster sustainable solutions.

Water quality impact on flotation Response: A focus on specific ions and temperature

Plant water recycling causes an accumulation of ions in the process water which may affect plant processes since processing routes are water intensive. Seasonal temperature differences affect the water quality through variation of the available recycled water within the plant between the summer and winter seasons. The objective of this study was therefore to investigate the effect of specific ions and temperature, relevant to onsite process water recycling and temperature variations brought about by seasonal changes, on the separation of gangue from valuable minerals in batch flotation of a low-grade Cu-Ni-PGE ore. Water and solids recoveries were impacted by Ca2+ and SO42-. At high SO42- concentrations, an increase in Ca2+ increased the mass of water and solids recovered. An increase in SO42- alone caused an increase in copper recovery whilst decreasing the copper grade. S2O32- alone affected the nickel recovery. An increase in S2O32- caused an increase in nickel recovery whilst the nickel grade was affected by the interaction of S2O32- and temperature. Furthermore, copper showed similar trends as those observed for nickel in the responses for the mineral grade. At high S2O32- concentration there was no observable change in the nickel and copper grades when temperature increased. At low S2O32- concentrations, an increase in temperature decreased the nickel and copper grades. In addition to the interactive effect of temperature and S2O32-, nickel was more temperature sensitive in comparison to copper. The study demonstrated that there are specific ion concentration ranges beyond which flotation performance was adversely affected and other ranges beyond which no observable effect on flotation was visible. Based on this understanding, it may be possible to predict the ideal operating conditions for the number of water recycles in a plant. The higher ionic concentrations and their corresponding ionic strengths resulted in a more stable froth in comparison to lower ionic concentrations and consequently an improvement in the recoveries.

Development of technology production of soft cheese "Mozzarella" on the basis of goat's milk

Among variety of food products, cheeses occupy one of the leading places. It is a concentrated protein product that is easily absorbed by body and has good organoleptic properties. The purpose of research is to develop technology for the production of soft cheese "Mozzarella" based on the optimal ratio of dairy raw materials (cow's and goat's milk) and enriched by food additive - paprika. Soft cheese product "Mozzarella" made from 50 % goat's milk: 50 % cow's milk became the best example. Standard and generally accepted research methods were used in work in accordance with technological scheme and taking into account latest achievements of science and technology. Physico-chemical indicators of finished products are presented. An x-ray spectroscopic analysis of the composition of chemical elements of soft cheese "Mozzarella", made in ratio of goat and cow milk, with addition of paprika, was carried out. The results of research showed that soft cheese contains many macro- and microelements. The product is rich in valuable proteins, vitamins and minerals, such as calcium - 27.21%, phosphorus - 18.80 %, and has high nutritional value. The implementation of the proposed technology in production allows to obtain products oriented to the domestic market. The developed cheese "Mozzarella" expands range of products, has increased nutritional and biological value, improves organoleptic and functional properties of product.

Valorization of acid mine drainage into potable water and valuable minerals through membrane distillation crystallization

Owing to the rise in population growth and demands for the current living standards, mineral and water resources are depleting at the alarming rate. Also, the mineral–water-energy nexus raises a concern of high-quality water and mineral production at low costs. Membrane distillation crystallization (MDC) has emerged as a promising technology capable of simultaneous water and mineral recovery from wastewater or industrially discharged brines. Herein, the MDC was evaluated for recovery of water and precious minerals from acid mine drainage discharged from the mine tailings. High quality fresh water with 99.9 % salt rejection and permeate flux of 2.32 kg·m−2·h−1 was recovered at 52 °C feed inlet temperature. Also, feed temperatures were varied to determine their impact on mineral crystal morphology, size distribution and growth rate. Predominantly recovered minerals were gypsum, manganese fluoride, potassium iron oxide, nickel oxide hydroxide, sodium sulphate and dihydrogen sulphate. Orthorhombic crystal structure of mineral salts was attained at low feed inlet temperature (34 °C). Higher feed inlet temperatures (i.e. 41° C and 52° C) promoted co-crystallization giving rise to orthorhombic polymorph structures. Narrow crystal size distribution was reported at low water recovery factor (initial growth) for all temperatures. However, the particle size distribution broadened as the recovery factor increased. The crystal sizes ranged from 3.91 ± 0.97 µm to 14.04 ± 3.31. Remarkably, crystal growth rate increased with an increase in feed inlet temperature. These findings open a research direction towards economic recovery of mineral and water to supplement the existing shortages. With a myriad of crystals obtained from the MDC process, an additional operational unit is required to selectively recover high economic minerals.

On the selection of the coarsest size class in flotation rate characterizations

This paper studies size-by-size batch flotation kinetics for the separation of Cu at particle sizes +75 μm, investigating the responses in the -150/+75 μm, -212/+150 μm, -300/+212 μm, -355/+300 μm and +355 μm size fractions. The kinetic results were analyzed to identify classes limited by the maximum achievable recovery or low flotation rates. Combinations of these classes were investigated, emulating the selection of the coarsest size in a kinetic study. The impact of compositing size classes was discussed, emphasizing implications in the identification of difficult-to-float components. The -212/+75 μm classes reached steady recoveries at long flotation times, whereas the -355/+212 μm classes presented sustained increasing recoveries at extended flotation times. Flotation rate distributions in the -212/+75 μm classes exhibited mound-shaped distributions, indicating low fractions of rate constants close to zero (R∞-limited case). Conversely, the -355/+212 μm classes presented reverse J-shaped distributions, with a high fraction of valuable minerals with flotation rates close to zero (rate-limited case). Combining several size classes in the definition of the coarsest size fraction in kinetic characterizations proved to hide the flotation patterns of the less massive constituents (+212 μm classes). The +75 μm and +150 μm cumulative retained classes trended towards steady recoveries, consistently leading to mounded flotation rate distributions. This study highlighted the need for reliable methodologies to select size fractions in kinetic characterizations, as their arbitrary definitions may lead to a misinterpretation of the mineral losses when compositing classes with different flotation responses.

Enhanced Flotation of Dolomite Particles by Grinding with Short Cylindrical Media

In the field of mineral processing, the successful flotation of target minerals requires sufficient liberation through grinding. The aim of this paper is to compare and evaluate the performance of ball versus short cylindrical media for comminution of dolomite by point and line contact, respectively. The results of the grinding experiments indicate that short cylinders generate more angular particles with intermediate sizes and exhibit a higher grinding efficiency compared to balls. The Population Balance Model demonstrates the distribution of broken fragment sizes during the breaking stage for each size range. The results of the DEM (discrete element method) grinding simulation are consistent with the experimental findings in terms of the distribution of particle sizes, the shape of the particles, and the distribution of broken fragment sizes. Furthermore, short cylinders selectively produce more active {104} crystal surface of dolomite, which possess a higher adsorption capacity with collectors and are preferentially floated as the concentrate. In reverse flotation for removal of dolomite, tests confirm that the products obtained from grinding with short cylinders exhibit a higher flotation recovery of dolomite compared to those obtained from ball grinding. This study provides a reference scheme for optimizing the grinding and flotation processes of valuable minerals.

MEMBENTUK GENERASI CINTA LAUT MELALUI PENDIDIKAN OCEAN LITERACY BAGI SISWA SEKOLAH DASAR DI DESA JEROWARU, LOMBOK TIMUR

The ocean is a natural resource with abundant potential, encompassing both marine biodiversity and valuable minerals such as oil, gas, and metals. However, this potential is currently facing serious challenges due to overexploitation and environmental degradation. Overfishing, pollution, and uncontrolled coastal development have threatened fish populations and marine ecosystems. Additionally, the phenomenon of climate change has increased pressure on ocean resources. Serious efforts are needed to curb and address the rate of ocean resource degradation, and one of them is by enhancing ocean literacy. This community engagement activity aims to enhance ocean literacy among the community, especially elementary school students in the Jerowaru District, East Lombok Regency. Various forms of activities and media that are used to convey ocean literacy content in this community engagement, i.e. drawing workshop, watching videos, retelling watched videos, and storytelling. Based on the conducted community engagement activities, it is evident that the enthusiasm of elementary school students in participating is very high. The students enthusiastically followed all the activities, executed all instructions well, and were able to provide feedback by answering questions about ocean literacy materials accurately and effectively.

Corruption and its Impact on Socio-Economic Development in Selected Countries of Africa

Africa is indeed a continent blessed with an abundance of natural resources, ranging from valuable minerals like gold, diamonds, copper, and oil. These resources hold immense potential for fostering economic growth and development across the continent. However, Africa continues to grapple with extreme poverty and underdevelopment, with corruption being identified as a major impediment to progress. This paper focuses on the pervasive issue of corruption in Africa, with Nigeria, Uganda, and Zimbabwe as case studies. The research employs a descriptive and analytical method of historical research, grounded in the Prebendal Theory as its theoretical framework. The findings of this study reveal the staggering impact of corruption on Africa's development, with annual losses of approximately $60 to $100 billion due to illicit financial flows. These flows divert resources away from political and socio-economic advancement, exacerbating widespread impoverishment. In conclusion, the paper underscores the corrosive effect of corruption on Africa's development and offers several recommendations to address this issue. These include promoting merit-based leadership selection, enforcing stronger legal actions against corruption, empowering anti-corruption agencies, engaging citizens and civil society in the fight against corruption, and strengthening the rule of law and judicial independence. These recommendations aim to pave the way for a more transparent and accountable future in Africa.

Petrography and geochemistry of Cretaceous bauxites from Jajce, Bosnia and Herzegovina

The study presents petrographic and compositional data of Late Cretaceous bauxite deposits in the area of Jajce, Bosnia and Herzegovina. Results indicate that bauxites exhibit ooidic to pisodic textures enclosed within a pelitomorfic matrix. Most of the deposits are boehmitic but in some localities, a considerable quantity of diaspore is identified. Hematite is the dominant Fe-mineral, while kaolinite, goethite and calcite are minor. The accessory minerals are represented by anatase, rutile and zircon. Al2O3 content ranges between 54.32–61.05 wt % and is negatively correlated to Fe2O3. Rare earth elements (REE) show variable concentrations, reaching up to 1353 ppm. The chondrite normalized patterns reveal negative Eu anomaly in all and positive Ce anomaly in almost all samples. Ce anomaly shows negative correlation with REE. Bauxites from the Jajce area represent valuable mineral resource with potentially valuable quantities of REE and Sc. Mineralogy and geochemical signature indicate a complex petrogenetic history.

Mechanistic Insights into Electrodeposition in Seawater at Variable Electrochemical Potentials

AbstractThe classical approach to manufacturing cement and concrete involves considerable and energy‐intensive exploitation of minerals from the environment, calling for alternative and sustainable methods to obtain such resources. Electrodeposition resulting from local pH changes near an oxygen or water reduction electrode can be used to grow valuable minerals in seawater for use in the cement and concrete industries, with the potential to use clean electricity without relying on the mining of resources. Limited knowledge is available about the electrochemical reaction networks that yield mineral precipitates via electrodeposition in seawater, hindering a complete assessment of the promise of such an approach to serving the construction industry. This work presents an investigation of the electrodeposition in seawater as a function of the applied potential. The work identifies multiple electrochemical potential regimes that yield distinct polymorphs, quantities, and production rates of calcium and magnesium‐based minerals due to the varying rates of oxygen reduction and water‐splitting reactions. The quality of the produced minerals is comparable to that of traditionally mined aggregates in terms of morphology and composition, supporting that seawater represents a vast source of raw materials for use in the construction industry upon an enhancement in the efficiency of hydroxide‐producing reactions and the reactor design.

All About Particles: Modelling Ore Behaviour in Mineral Processing

Mineral processing encompasses the series of operations used to first liberate the valuable minerals in an ore by comminution, and then separate the resulting particles by means of their geometric, compositional, and physical properties. From a geometallurgical perspective, it is fundamental to understand how ore textures influence the generation of ore particles and their properties. This contribution outlines the processes used to generate and concentrate ore particles, and how these are commonly modelled. A case study illustrates the main ideas. Finally, a brief outlook on the most important research challenges remaining in this branch of geometallurgy is presented.

Ecological desalination of anchovy residues and their mixture with soybean meal for the production of poultry feed: Optimization of waste through response surface methodology (RSM)

Salted anchovy bones are a non-recyclable waste product containing high salt levels. However, they also contain valuable minerals such as calcium, phosphorus, potassium, magnesium, and nitrogen. This study aimed to find a cost-effective method to desalinate anchovy bones while preserving their nutritional value and repurposing them as a raw material for poultry feed. Through various tests, we were able to reduce the salt content of the anchovy bones from 15.4% to 4.7% using a 50/50 percent mixture of tap water and from 15.4% to 3.7% using a mixture of tap water and soybean meal in a 30/70 percent ratio. Combining soybean meal with desalted anchovy bones resulted in a nutritional composition comparable to that found in poultry feed, reducing salt content. The response surface method (RSM) was employed to determine the optimal proportions of desalted anchovy bones (70-90%) and soybean meal (10-30%) and to study the variables affecting the concentrations of NaCl, Ca, P, Ash, and TNM. The study revealed the influence of desalted anchovy bone and soybean meal percentages on these concentrations. This study demonstrates that the method used provides an ideal approach for understanding the interactions between input parameters (% DAR, % SM) and output parameters (NaCl, Ca, P, Ash, and TNM) and shows promising results for the desalination of anchovy bones using a soybean meal cake as well as the feasibility of creating poultry feed.

Recovery of phosphorus from aqueous media as vivianite by crystallization

AbstractSince phosphorus resources are limited, optimal management of available phosphorus (P) and phosphorus recovery is a vital issue for the entire world. Studies continue on more efficient and economical phosphorus recovery techniques from wastewater and sludge. Recovery of phosphorus as vivianite is a current issue worldwide and studies are ongoing. Vivianite is a valuable mineral used in some industrial facilities and agricultural activities. Therefore, recovery of P from wastewater based on vivianite formation not only contributes to the sustainable use of phosphorus but also provides potential economic opportunities. In this study, it was aimed to determine the recovery potential of phosphorus as vivianite and to evaluate the effects of operational conditions on phosphorus recovery. For this purpose, two types of lab‐scale crystallizer, semibatch completely mixed and fluidized bed, were used. In experimental studies, the effects of operating parameters such as pH, Fe/P ratio, Fe feeding rate, and P concentration for vivianite crystallization were investigated. The highest phosphorus recovery was found at a Fe/P ratio of 1.8 and P removal efficiency of up to 69% was achieved by vivianite crystallization.

The purification of acid mine drainage through the formation of schwertmannite with Fe(0) reduction and alkali-regulated biomineralization prior to lime neutralization

Acid mine drainage (AMD) contains abundant Fe (II), Fe(III), and SO42−, as well as a large amount of dissolved toxic metals and metalloids, posing a serious threat to the environment. In this study, an integrated technique for the treatment of AMD was proposed. The technique started with pre-oxidation followed by Fe(0) reduction and alkali-regulated biomineralization and then ended with lime neutralization. The technique removed toxic metal oxyanions in the pre-oxidation stage and recovered pure schwertmannite during the subsequent alkali-regulated biomineralization. Fe(III), which could not be directly biomineralized, was reduced to Fe(II) by Fe(0). A small amount of alkali was added to regulate the hydrolytic mineralization reaction after Fe(II) oxidation in AMD, which in a single biomineralization could remove in the form of schwertmannite >95 % of soluble Fe in the AMD. In the subsequent lime neutralization process, the amount of lime required and the sludge produced were reduced by 75.4 % and 84.9 %, respectively, compared to the raw AMD. Additionally, the content of non-ferrous metals in the sludge increased 5.6-fold. Compared with non-alkali-regulated biomineralization, the schwertmannite obtained by the alkali-regulated biomineralization had a higher adsorption capacity for oxyanions (e.g., arsenic, chromium, and antimony). The new approach should significantly reduce the treatment cost of AMD and recover Fe and S elements in the form of valuable secondary minerals, such that it is reasonable to expect that it will be widely adopted in practical applications.