Assessment of various scenarios for the development of mineral deposits in the region (as exemplified by the Republic of Tuva)

It is shown that Tuva has a sufficiently rich mineral and raw material diversity and the potential for their development. Nevertheless, the development of the republic is hindered by the existence of transport and infrastructure restrictions, to eliminate which, first of all, it is necessary to build a railway along the Kyzyl-Kuragino highway. On the other hand, given the border area of the territory that adjoins western Mongolia, there is a possibility of implementing various scenarios for the construction of railway tracks. The calculations performed to evaluate scenarios for the development of mineral resources of the republic using methods of intersectoral assessment shows that when implementing a pessimistic option for the development of the potential of mineral resources of Tuva (in which the construction of the railway to Tuva is frozen and only deposits of non-ferrous metals and gold are developed), the gross regional product of the republic will grow to 164 billion rubles, which will be 45% of the growth of this indicator in relation to the GRP of 2018. With the implementation of the optimistic option I, (in which it is planned to build a railway along the Kuragino-Kyzyl highway, coal deposits, non-ferrous metals, gold are being developed), the GRP of the republic will grow up to 351 billion rubles. In addition, calculations have been made for the construction of railways that would connect Tuva with Mongolia and China.

Pengaruh penambahan Silikon pada remelting piston motor bekas menggunakan tungku induksi terhadap kekuatan tarik dan kekerasan

Aluminum is one of the most widely used non-ferrous metals in industry and engineering because of its light weight and resistance to corrosion. The purpose of this study is to change the waste of used motor pistons using an induction furnace by recycling or remelting the material and adding a mixture of silicon with variations of 8%, 10% and 12% to improve its mechanical properties. In this research, I used the main furnace for the smelting. The results of this study in the tensile test showed that the strength and wear strength increased with the addition of silicon elements but became brittle and stiff this happened because the value of the elastic modulus decreased with the addition of silkon elements, namely at 12% at 1.06 N/mm² and at a variation of 8 % of 1.13 N/mm². In the hardness test, it was found that the addition of silicon to aluminum with variations of 8%, 10% and 12% increased the hardness of the material.

Components’ Characterization of End-of-Life Dishwashers

The treatment of Wastes of Electrical and Electronic Equipment (WEEE) is a significant source of secondary raw materials. Ferrous and non-ferrous metals, electronic equipment, and plastics are among these materials. One of the most common metals sourced out of WEEE is stainless steel. Dishwashers are common sources of stainless steel, so large amounts of stainless steel can be recovered from them. In this project, dishwashers were submitted to size reduction via shredding, and the shredded products went through a magnetic separator (which separates all the magnetic ferrous components), an eddy current sensor (which separates all the non-ferrous components) and an induction sorting sensor (which removed all the metallic fractions). This procedure led to the following two streams: one with stainless steel, boards, and cables and another stream mainly including plastic. In the next stage, the stainless-steel stream passed through a high-intensity magnetic separator, leading to a magnetic and a non-magnetic stream. Thereafter, hand sorting was applied to both streams which aimed to increase the recovery from each stream.

Nonoxidizing heating of chip‑powder dispersions of ferrous metals in hydrocarbon atmosphere

The process of inorganic and organic components temperature transformation of metal waste into solid and gaseous products in a continuous hot briquetting muffle furnace has been studied. The composition of the hydrocarbon atmosphere formed in the muffle under conditions of limited access to the oxidizer has been determined. It is shown that the thermal destruction of the coolant oil phase proceeds according to a complex mechanism of consecutive reactions, including polycondensation, polymerization, and deep compaction with a constant decrease in the hydrogen content and ends with the formation of a coke‑like carbon residue on the surface of metal particles and an air suspension of finely dispersed carbon particles (smoke). When it is heated to hot briquetting temperatures of 750–850 °C, chemically active dispersions of ferrous metals are protected from oxidation first by a hydrocarbon gas with a density of 9.0–13.5 kg/m3, then by a pyrocarbon coating with a thickness of 0.1–0.3 mm up to the completion of the processes of pressing and cooling the briquette.

Manufacturing Complexes for the Non-Ferrous Metals Processing of the Golden Horde Cities: Search for Analogies

The article is devoted to the Golden Horde complexes associated with the processing of non-ferrous metals and the organization of handicraft production. Historiography has repeatedly voiced the significant role of the masters of the conquered territories in the formation of the metalworking production of the Golden Horde. In the article the characteristic features of the Golden Horde craft complexes are considered in comparison with similar complexes of Kievan Rus cities, as well as with some traditions of the organization of Central Asian craft. Data from workshops of Tsarevskoe, Uvekskoe, Bolgarskoe settlements, Staryy Orhey were brought in. The complexes are considered in terms of such parameters as location in the city planning system, type of structure, presence of smelting furnaces and hydraulic structures, set of production, range of products and coexistence with other industries. It is noted that in the cities of the Golden Horde there are various forms of organization of metalworking crafts, small workshops in craft districts and complex workshops functioning within household plots. The workshops location is not clearly defined; in general, they do not form specialized areas. The structures in which the workshops operate have no design features and may not contain heat engineering structures. Workshops for the processing of non-ferrous metals most often function in conjunction with bone carving and pottery production, less often in a composition with leather, glass making, and gemstone processing. This is significantly different from the situation in Kievan Rus cities, where the processing of non-ferrous metals is most often combined in various forms with the processing of ferrous metals. The handicraft complexes of the Golden Horde cities demonstrate a wide variety of forms, and most of them find their analogies in the materials of ancient Russian cities, therefore, it is difficult to single out specific features indicating possible genetic connections.

Foreign trade relations between Ukraine and China: main directions of development

The article is devoted to the problems of developing foreign trade relations between Ukraine and China, as China ranks first in terms of trade among other trade partners of Ukraine. The article analyzes the reasons for China's interest in Ukraine and possible benefits for our country. The countries' export, import, foreign trade turnover, and foreign trade balance indicators are studied. The calculated indicators allowed us to state a positive trade balance for most goods, which indicates the advantage of exports over imports. The growth rates of exports and imports for the main product groups are calculated. It is concluded that the dynamics of international trade for ferrous metals, seeds, and fruits export growth rates are the highest, and electric machines and flour products - the lowest. The necessity of direct investments for further development in all spheres of the economy is substantiated. The structure of investment cooperation between Ukraine and China is analyzed, and conclusions are made about the number of direct investments coming from China. Based on the research and study of literature sources on the selected topic, the following conclusions were drawn on the prospects of foreign trade relations between China and Ukraine: it is advisable to study in detail the development of China's interests to adjust Ukraine's export policy to revive cooperation partners of Ukraine; as for the Ukrainian-Chinese trade relations, the following product groups have particular prospects for development: already positive in the foreign trade balance (corn, soybeans, barley, dairy products, honey), negative in the foreign trade balance (poultry, pork, fruits, vegetables) ) and products that do not require special state permits (sunflower oil and a wide range of food products). It is expedient to develop bilateral relations in mutually beneficial areas for both countries; there is a positive trade balance for most goods. For ferrous metals, seeds, and fruits, the export growth rates are the highest. For electric machines and flour products - the lowest, we need to emphasize the stabilization of exports of commodity groups, where export growth has increased. Ukraine needs to make tremendous efforts to join the «One Belt, One Road» initiative as a participant: because our country is only a watchdog. Also, you need to show more initiative and declare your desire to join the project «16 + 1»

Adsorbents Made of Inorganic Industrial Waste

Data demonstrate the possibility of manufacturing adsorbents by using inorganic industrial waste and provide raw material list for this purpose. Inorganic waste coming from water treatment, mining and construction industries, solid fuel combustion products, spent inorganic sorbents, catalysts and chemical absorbers, chemical, metallurgical and metal finishing industries waste are used as raw materials. Adsorbents production methods by using inorganic industrial waste have been analysed, and parameters of porous structure and adsorbents sorption activity in terms of organic compounds and cations of non-ferrous metals resulting from aqueous medium are listed.