Investigation Of The Properties Of The Developed Composite Chemical Flotation Reagents And Their Application In The Flotation Process

The Paper Considers The Results Of Studying The Chemical Composition And Physicochemical Properties Of Ore And A Number Of Organomineral Ingredients Based On Local Raw Materials And Production Wastes For The Development Of Composite Flotation Reagents-Foaming Agents. A New Flotation Reagent-Foaming Agent, Conventionally Designated "KHF-VS", Is Synthesized, Similar To The Russian-Made T-92. The Results Of Physicochemical Studies Of The Developed Flotation Reagents-Foaming Agents Are Presented, And On Their Basis Effective Compositions For Use In The Process Of Ore Flotation Have Been Developed. To Compare The Sorption Properties Of The Developed Composite Flotation Reagents-Foaming Agents Of The Kkhf-VS Class With A Traditional Foaming Agent - T-92, We, Together With The Employees Of Almalyk Mining And Metallurgical Combine (AGMK), Conducted Tests In Laboratory Production Conditions. According To The Results Of The Experiments, The Best Indicators Were Obtained Using The Sample KHF-VS-1, The Extraction Of Copper In The Rough Concentrate Consisted Of 91.35% With A Quality Of 6.74% Copper

Preparation Of Cotton Raw Material And Analys Of Its Acceptance And Delivery Mechanisms

The article describes about  the period of cotton harvest at the ginnery under the Aktash ginnery No. 3 in the system of cotton-textile cluster and the periodic delivery of cotton on the day of delivery of the maximum amount of cotton in the season, the receipt of cotton delivered by truck to ginneries. and taking into account the status of domestic and foreign transporters used in the transmission, 20-30% of the total amount of cotton to be accepted at the enterprise, 70-80% in the outlying areas, the current XPP-III transporter receives and transfers cotton due to low productivity cases of non-compliance with the requirements of the technological process. Object of the work: One of the main requirements for the technological process of cotton processing today is to improve the performance of the XPP-III cotton receiving and transfer conveyor while maintaining the natural properties of the raw material. Methods: Due to the large amount of cotton in the horizontal belt on the XPP-III conveyor and the increase in the mass of cotton, it was observed that the cotton is fed to the sloping belt elevator in a dense and large amount without crushing. Results: It was studied that the process of entering a large amount of cotton into the settlement should be between 18:00 and 22:00 hours, and during this time all the mechanized means in the settlement should work at high productivity. Conclusion: operation of all machinery at high voltage as a result of continuous supply of cotton to the cotton mill,their time to unload cotton from trucks,non-accumulation of vehicles,it will be necessary to avoid congestion from waiting traffic,  and  all this shows the need of creating a machine that receives and transmits cotton which operates at high productivity

A Cost-Benefit Analysis of Early Childhood Hygiene Interventions in Uzbekistan

Abstract This paper applies cost-benefit analysis (CBA

Investigation of the kinetics of heat treatment of epoxy polymers

The study examines the effect of the concentration of modifiers (BDI) on the annihilation characteristics of cured epoxy polymers using the positron annihilation method. The results show that both the concentration and size of microcavity defects decrease, which can be explained by the formation of densely sewn areas due to the production of additional bridges. The supramolecular structure of the formed epoxy polymer is discussed, with the identification of several distinct areas, including polymer globules formed by stacking chains of simple polyester macromolecules around polymerization centers, and the interglobular space consisting of the ends of macro chains and low molecular weight products. The end groups of polymerization-cured epoxy polymers, such as double bonds of the vinylidene type, hydroxyl and unreacted epoxy groups, create conditions for the splitting of BDI in the interglobular space. The study also demonstrates that at optimal concentrations of modifiers, there is a decrease in the radius and concentration of micropore defects, as well as a general decrease in the proportion of free volume. The curing processes of epoxy polymers and their heat treatment in the presence of modifiers are investigated, with BDI having a significant effect on the formation of the epoxy polymer structure

Adhesion-strength and tribotechnical properties of machine-building composite polymer coatings

The article presents the results of studies of adhesive, strength and tribotechnical properties of composite polycaproamide polymer materials and coatings based on them for mechanical engineering purposes. It has been established that the relative change in the adhesion strength depends on the degree of filling in air and in argon has an extreme character passing through a maximum for coatings based on PCA with aluminum oxide, and for coatings made of PCA with copper oxide, it has a complex character. The formation of adhesive, strength, and tribotechnical properties of filled polycaproamide coatings was also studied. At the same time, it was found that by adjusting the temperature-time technological modes, it is possible to increase the adhesive, strength, and tribotechnical characteristics of composite polycaproamide coatings for machine-building purposes

Influence temperature and strong magnetic field on oscillations of density of energy states in heterostructures with quantum wells Hgcdte/Cdhgte

For the first time, the influence of temperature and a transverse strong magnetic field on the oscillations of the density of energy states is studied in the conduction band of heterostructures with quantum wells HgCdTe/CdHgTe. Analytical expressions are derived for oscillations of the density of states in quantum-dimensional heterostructural materials in the presence of transverse quantizing magnetic fields with a parabolic dispersion law. A new mathematical model has been developed for calculating the temperature dependence of the density of states oscillations in nanosized heterostructural materials under the action of a transverse quantizing magnetic field

Temperature dependence of width band gap in Inxga1-Xasquantum well in presence of transverse strong magnetic field

This article investigated the temperature dependence of the width band gap in InxGa1-xAs quantum well in the presence of a transverse strong magnetic field. A new method was proposed for determining the width band gap of GaAs/InxGa1-xAs heterostructures based on a InxGa1-xAs quantum well in the presence of a magnetic field and temperature. An analytical expression is obtained for calculating the width band gap of a rectangular quantum well at various magnetic fields and temperatures

Investigation of the sorption method of processing molybdenum-containing raw materials to extract rare metals

The article investigates the sorption method of concentrating rare metals on various sorbents (brands “Purolight”: A-100, A-170, A-172 and BO-020) and determines the optimal conditions for their extraction. It is shown that the extraction of molybdenum on the sorbent “Purolight A-100” was 98%. The proposed sorption mechanism consists in the formation of molybdenum complexes with functional phosphor basics and sulfate groups of sorbents. Sorption of rhenium on the Purolite A-170 sorbent was 93%. Sorption of rhenium on the sorbent BO-020 is described by the Langmuir equation with a maximum static exchange capacity of 94%. Based on the sorption and desorption kinetics of molybdenum and rhenium on various ion-exchange sorbents, it was shown that the sorption of molybdenum and rhenium proceeds most efficiently on low-basic anion exchangers A-100 Mo and A-170, respectively, and after double recleaning of the “rough” rhenium concentrate, ammonium rhenium of qualification was obtained AR-0

Modeling the Temperature Dependence of Shubnikov-De Haas Oscillations in Light-Induced Nanostructured Semiconductors

In this work, the influence of light on the temperature dependence of transverse magnetoresistance oscillations is studied. A generalized mathematical expression that calculates the temperature and light dependence of the quasi-Fermi levels of small-scale p-type semiconductor structures in a quantizing magnetic field is derived. New analytical expressions have been found to represent the temperature dependence of transverse differential magnetoresistance oscillations in dark and light situations, taking into account the effect of light on the oscillations of the Fermi energy of small-scale semiconductor structures. A mathematical model has been developed that determines the light dependence of the second-order derivative of the transverse magnetoresistance oscillations of p‑type semiconductors with quantum wells by magnetic field induction. A new theory is proposed, which explains the reasons for the significant shift of the differential magnetoresistance oscillations along the vertical axis measured in the experiment for dark and light conditions