The allocation of gallium from a multicomponent eutectic in the disposal of technological waste recycle

2017 ◽  
Author(s):  
V. B. Koltsov ◽  
E. A. Sevrukova ◽  
S. A. Slesarev
Keyword(s):  
Technological Waste ◽  
Multicomponent Eutectic

Wastewater sludge treatment at the municipal wastewater treatment facilities with the purpose of its further utilization

2021 ◽  
pp. 46-51
Author(s):  
Ю.А. Егорова ◽  
В.И. Кичигин ◽  
О.И. Нестеренко ◽  
А.А. Юдин
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Sludge ◽  
Mineral Fertilizers ◽  
Municipal Wastewater Treatment ◽  
Urban District ◽  
Sludge Treatment ◽  
Technological Waste ◽  
Treatment Facilities ◽  
Water And Wastewater

Осадки городских очистных канализационных сооружений являются самым массовым технологическим отходом, создающим проблемы утилизации для любого города. Рассмотрены возможные методы обработки осадков сточных вод на городских очистных канализационных сооружениях городского округа Самара с целью их последующей утилизации. Обозначены причины и приведены документальные подтверждениянекорректности возложения ответственности за обращение с такими отходами только на организации водопроводно-канализационного хозяйства. Рассмотрен способ захоронения обезвоженного осадка сточных вод в обвалованном полигоне. Установлено, что обработанные на очистных сооружениях осадки относятся к V классу опасности для окружающей среды. Обработанные, стабилизированные, подсушенные, обезвреженные отходы осадков сточных вод (малоопасный осадок с песколовок при очистке хозяйственно-бытовых и смешанных сточных вод, практически не опасный осадок с песколовок при очистке хозяйственно-бытовых и смешанных сточных вод и избыточный ил биологических очистных сооружений в смеси с сырым осадком) могут быть использованы в качестве наполнителей бетонно-цементных смесей и органоминеральных удобрений или переданы для утилизации сторонним организациям. Sludge from the municipal wastewater treatment facilities is the most massive technological waste that causes trouble for any city. Possible methods of wastewater sludge treatment at the municipal wastewater treatment facilities of the Samara Urban District with the purpose of its further utilization are considered. The reasons are indicated and documentary evidence of the incorrectness of assigning the responsibility for processing such wastes only to the water and wastewater utilities is provided. The method of landfilling dewatered wastewater sludge in a ridged landfill is considered. It has been established that the sludge processed at the wastewater treatment facilities is referred to the V class of environmental hazard. Sludge subjected to the treatment, stabilization, drying and neutralization (low hazardous sludge from grit chambers for domestic and mixed wastewater treatment; almost non-hazardous sludge from grit chambers for domestic and mixed wastewater treatment and excess sludge from biological treatment facilities mixed with raw sludge) can be used as fillers for concrete-cement mixtures and organo-mineral fertilizers or transferred for disposal to outside companies.

Analytical Representation of Multicomponent Eutectic Systems

1960 ◽  
Vol 52 (7) ◽  
pp. 619-620 ◽  
Author(s):  
Imrich. Klein ◽  
Irvin M. Krieger ◽  
H. Benne. Kendall
Keyword(s):  
Analytical Representation ◽  
Eutectic Systems ◽  
Multicomponent Eutectic

scholarly journals Influencia de la velocidad en las asas recicladas de polietileno de alta densidad probada con un método adaptado específico industrial

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
Fidel Alfonso Romero-Toledo ◽  
Dan Florin Teusdea ◽  
Mircea Vodă
Keyword(s):  
Tensile Strength ◽  
Mechanical Performance ◽  
Mechanical Resistance ◽  
Injection Process ◽  
Cleaning Agents ◽  
Duty Cycles ◽  
Technological Waste ◽  
Nonstandard Conditions ◽  
Multiple Measurements

This article studies the influence of the tensile speed when testing plastic products used to transport containers that may contain various liquids (drinking water, windshield fluid, cleaning agents, etc.). This case study was conducted on certain parts, generally called "handles", which are basically plastic items obtained largely from recycled technological waste resulting from the injection process of various packaging related to the food industry polyethylene caps and lids more precisely. During the handling and transport process, these parts are subjected to various static stresses, therefore, a minimum mechanical resistance is required. Fatigue stress has not been performed due to a limited number of duty cycles. To determine these quality characteristics, multiple measurements of tensile strength and elongations were performed at different traction speeds, measurements that have been validated on the market for several years. We have observed that testing speed over 500 mm/min is not necessary because the tensile strength values do not vary significantly. These results are very important in determining the constructive form of these products and the methods for validating quality indicators. Also, we have proposed to identify a method able to assess the mechanical performance of the product used in nonstandard conditions. The study can be used for a much wider range of similar applications in the plastics industry.

scholarly journals Application of solid-liquid extraction with organic acids for recovery of precious metal from technological waste in disuse

2020 ◽  
Vol 8 (8) ◽  
pp. 366-373
Author(s):  
Antonio Dos santos ◽  
Dinalva Schein ◽  
Mauro Cesar Marchetti ◽  
Estela Bresolin Pereira ◽  
Arthur Rolim Stasiak
Keyword(s):  
Liquid Extraction ◽  
Added Value ◽  
Electronic Industry ◽  
Protection Measures ◽  
Aqua Regia ◽  
Technological Waste ◽  
Liquid Part ◽  
Solid Part ◽  
Solid Liquid Extraction ◽  
Solid Liquid

The electro and electronic industry has been increasing gradually, causing an increase in the generation of waste of electrical and electronic equipment, which have several components that have added value such as - for example - gold. Aiming at environmental protection, measures are sought for the recovery of these metals, through tests with several technologies such as leaching. This consists in separating the component from the solid part, transferring it to the liquid part, using acids. It is necessary to study acids that are less harmful to the environment. Thus, microprocessors of obsolete computers were collected, their characterization was carried out and the elements present in the pins were identified. After the characterization, the leaching stage was carried out, firstly with aqua regia; then with acetic and citric acids. The leaching results presented about 10 mg / L of gold with aqua regia and about 0.5 mg / L with citric acid.

scholarly journals New technological procedure for sustainable processing of mining technological waste

2012 ◽  
pp. 61-88
Author(s):  
Rodoljub Stanojlovic ◽  
Zoran Stirbanovic ◽  
Jovica Sokolovic
Keyword(s):  
Technological Waste

scholarly journals Hopeful high-strength casting alloys based on Al―Mg―Ge(Si) ternary systems

2020 ◽  
Vol 2020 (01) ◽  
pp. 55-66
Author(s):  
N. P. Korzhova ◽  
◽  
T. M. Legka ◽  
Y. V. Milman ◽  
K. E. Grinkevich ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Cast Alloy ◽  
High Strength ◽  
Ternary Systems ◽  
Eutectic Type ◽  
Eutectic Alloys ◽  
Binary Eutectic ◽  
Casting Aluminum ◽  
Multicomponent Eutectic

The relative analysis of phase equilibria in the Al-corner of the ternary phase diagrams of Al―Mg―Ge(Si) systems is carried out. Both systems are characterized by the presence of a quasi-binary cross-section of the eutectic type, which is shifted towards Mg-enriched alloys, and sufficiently width range existence of the univariant eutectic transformation L-Al + Mg2Ge(Si). The melting point of quasi-binary eutectic (-Al + Mg2Ge) in the Al―Mg–Ge system and (-Al + Mg2Si) in the Al―Mg―Si is 629 °С and 597 °С, respectively, and the content of the strengthening phase ((Mg2Ge or Mg2Si) in eutectics is 7% (vol.) и 13% (vol.). The properties of non-alloyed alloys with different volume content of eutectic are investigated and the basic compositions of alloys with the optimal strength/ductility ratio for subsequent doping are selected as well. Taking into account the coordinates of the corresponding eutectic transformations, the doping system with the participation of Zn, Cu and other elements is determined. The heat treatment regimes for multicomponent eutectic alloys were selected, to ensure precipitation of Zn(Cu)-nanoparticles that strengthen matrix solid solution. It was shown that according to the level of mechanical properties, these alloys belong to high-strength alloys with property ranges: -Al + Mg2Ge) ― В = 470―590 МPа, 0,2 = 350―520 МPа, = 8,0―15,5%; -Al + Mg2Si) ― В = 400―560 МPа, 0,2 = = 430―520 МPа, = 2,3–-4,5%. Using a complex U-like Nechenji―Kuptsov test, casting properties were determined and it was shown that the fluidity of (-Al + Mg2Si) alloy was 1,3 times higher than that of the AK7ch cast alloy. In terms of the combination of mechanical and casting properties, the new multicomponent eutectic alloys based on the Al―Mg―Ge(Si) ternary systems are superior to the best modern industrial casting aluminum alloys. Keywords: casting aluminum alloys, ternary Al―Mg―Ge(Si) systems, eutectic alloys, alloying, microstructure, mechanical properties, fluidity.

scholarly journals Technical possibilities of the cutting oils filtration residues combustion

2014 ◽  
Vol 60 (No. 2) ◽  
pp. 45-49
Author(s):  
M. Pešek ◽  
M. Přikryl
Keyword(s):  
Climate Change ◽  
Czech Republic ◽  
Biomass Burning ◽  
Energy Production ◽  
Fossil Fuels ◽  
Final Solution ◽  
The Czech Republic ◽  
Greenhouse Gases Emissions ◽  
Technological Waste ◽  
Utilization Of Wastes

The value of consumption share of electricity from renewable sources in the Czech Republic up to 8% in 2010 stems from an individual obligation adopted by the Czech Republic when signing the Kyoto Protocol of the United Nations Framework Convention on Climate Change. One of the possibilities how to reduce greenhouse gases emissions from fossil fuels consists in biomass burning. Biomass used for power purposes is obtained on purpose as a result of production activities or it originates from utilization of wastes from agricultural, forest and industrial production. In biomass burning, the boiler used produces carbon dioxide, recyclable in nature. Increase of the amount of municipal and technological waste including materials that are heavily soiled and difficult to recycle pushed up demand to obtain the best possible solutions in terms of both technological and economic terms. Recycling of materials can provide multiple circulations which have to lead to final solution such as storage or use in energy production. One of the solutions shall consist in recommending the installation of the sorting line, the homogenizer, and possibly a pelletizer to ensure sufficient homogeneity of the material.  

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