The present study investigates the effect of blend copolymers on the physico-mechanical properties of mortar mixtures. The addition of blend copolymers to the mortar affected the physico-mechanical properties of mortar mixtures. As the ratio of PVA in the mixed copolymer increased, the properties of the mortar also improved.
Синтез высокодисперсных форм оксида цинка легированных редкоземельными элементами
Известно, что ZnO, легированный редкоземельными элементами, оказывает существенное влияние на люминесценцию, химическую и поверхностную модификацию ZnO. Обсуждаются детальные исследования влияния легирования Eu на морфологическую и кристаллическую структуру синтезированного ZnO, свойства и механизм передачи энергии. Крысиный оксид сирек кездесетин жерлик металдармен жане 4д отдельные элементы легирлеу натижесинде ЗнО жуелеринін оптикалык касиеттерін арттыру мүмкіндігі тудады.
Synthesis and characterization of vinyl acetate graft copolymers
- Preparation of grafted copolymer P(mPEG-g-VAc)
- Mechanism of grafting polymerization
- Fourier-transform infrared spectroscopy
- Nuclear magnetic resonance spectroscopy
- Thermogravimetric analysis and Differential Scanning Calorimetry analysis
- Scanning electron microscopy The mPEG and grafted copolymer P(mPEG-
- Fourier-transform infrared spectroscopy studies
- Differential Scanning Calorimetry analysis
- Thermogravimetric analysis
- Scanning electron microscopy The scanning electron micrographs of pure mPEG
The Differential Scanning Calorimetry (DSC) data of the initial mPEG and the obtained copolymer P(mPEG-g-VAc) are shown in Figure 5. Glass transition temperature (Tg) taken as the inflection point of the second heating DSC curves recorded at 10° C·min−1. The thermal stability results show that grafted copolymer has excellent thermal stability and can be widely used for various applications.
Disposal of slag of refined ferrochromium by obtaining a sintered and carbonized construction products
In the paper, the chemical composition of the slag of ferrochrome refined grades was investigated (Table 1). In this regard, the studies of the sintering process were carried out in area C. An increase in the maximum particle size of the used slag significantly increased the strength of the resulting briquettes.
Silver, gold and palladium leaching from electronic scrap using bromine- bromide solution
Berkovich I.V
In this regard, the study of the optimal conditions for dissolution of gold and related precious metals during the process of bromine-bromide leaching is of practical and theoretical importance. Thus, the present work is devoted to studying the thermodynamics and kinetics of dissolution of gold and related valuable metals, mainly copper, silver, palladium and platinum, from typical samples of electronic scrap in the bromine-bromide system, depending on the pH of the medium, the concentration of active bromine, bromide ions and phosphate buffer solution. The gold and copper content in the solution was analyzed on an ISP-OES instrument.
We have studied the gold dissolution process in the bromine-bromide system in the presence of a phosphate buffer solution (NaH2PO4) to continuously maintain the pH at a certain level. 2-4, a noticeable flow of gold in the system Br2- NaBr-NaOH-NaH2PO4 · H2O starts at pH <8 and at pH 6 almost all the gold goes into solution. In the next series of experiments, we studied the effect of the concentration of active bromine (Br2) on the rate and completeness of gold leaching and copper behavior at a concentration of 20 g·dm-3NaBr bromide.
In the process of leaching gold in the production solution, in addition to gold (52 ppm), traces of iron (3.4 ppm) and copper (6-8 ppm) were found. 15 and 16, the dissolution of palladium in the bromine-bromide system proceeds much more slowly compared to the behavior of gold. The leaching conditions of silver and palladium in the bromine-bromide system are practically presented and theoretically justified.
A noticeable dissolution of gold in the bromine-bromide system begins at pH≤8, and at pH = 6 almost all the gold goes into solution quite selectively.
Исследование влияния пластификаторов и термопластов на механические свойства
Влияние модификаторов на прочность и ударную вязкость ЭС Количество
- Механизм модифицирования ЭС и угле- пластика пластификаторами и термопластами
Investigation of the effect of plasticizers and thermoplastics on the mechanical properties of epoxy and carbon fiber reinforced plastics (Review). The goal is achieved via several methods of ER and carbon fiber reinforced plastic modifications. One of the effective modifications requires the introduction of plasticizers (tricresyl phosphate, oleic acid) or thermoplastics (polysulfone, polycarbonate, polystyrene, high impact polystyrene).
The article contains experimental data on the influence of different types of modifiers on the strength of ER and CFRP available in the literature. The optimal supply of plasticizers in ER is 15% and depends on the completeness of the solubility in the binder, a further increase in the supply of plasticizer leads to a decrease in the strength of the material. The effect of thermoplastic coating on the mechanical properties of woven carbon-epoxy composites // Journal of Materials and Science.
Svyazuyushchie dlya polimernyh kompozicionnyh materialov (Veziva za polimerne kompozitne materiale) / Uchebnoe posobie za studentov po special'nosti "Kompozicionnye nanomaterialy". Modifikaciya epoksidnogo svyazuyushchego s povyshennymi harakteristikami dlya polucheniya kompozicionnyh materialov (High Performance Epoxy Binder Modification for Composite Materials). Svyazuyushchie dlya kompozicionnyh materialov na osnove epoksidnogo oligomera, modificirovannogo smesyami termoplastov (Vezivo za kompozitne materiale na osnovi epoksi oligomera, modificiranega z mešanicami termoplastov).
Термопластичные полимеры для конструкционных композиционных материалов (обзор) / ВИАМ, Москва, Июль 1990.
Iron sulphates production being polarized by the direct and alternating currents
The essence of the method is that a catalyst is added to a sulfuric acid solution of iron sulfate (II) on a carbon fabric and the mixture is stirred in a stream of oxygen. The first electrolyzer and the cathode space of the second electrolyzer are filled with sulfate electrolyte (4). A titanium plate cut from VT-1-0 titanium plates, iron St. was used as the electrodes in the experiments.
In the cathodic half-cycle of the alternating current, hydrogen gas is released on the surface of the iron electrodes due to the low value of the ion recovery overvoltage. The results of iron oxidation in the first electrolyzer were monitored by determining the weight loss of the iron electrodes. The dependences of the reduction in the mass of iron electrodes when polarized with alternating current and the current efficiency of their dissolution on the current density in the first electrolyzer (Fig. 2) and the dependence of the degree of oxidation of iron ions (II) to iron ions (III) on the current density when polarized with direct current in the second to the electrolyzer (Figure 3).
In this case, the concentration of sulfuric acid slightly affects the change in the mass of the electrodes (table). It was established that the composition of the compound corresponds to the formula: Fe2(SO4)3 ∙ 9H2O. With further polarization of the resulting solution with a direct current, the iron (II) ions are oxidized to the trivalent state.
Based on the results of the study, an electrochemical method for the production of iron sulfate (III) was developed [16].
Study of the influence of fine fillers from technogenic waste and chemical additives on the properties
Study of the influence of fine fillers from technogenic waste and chemical additives on the properties. The standard Abrams cone is used to determine the cone melt of the self-compacting concrete. All research and tests were carried out according to the normative documentation operating on the territory of the Republic of Kazakhstan.
To perform the tests, the sand of the manufacturer "Mark" LLP (Almaty region, Kazakhstan) was used, corresponding to the standard document [10]. The effectiveness of chemical and mineralogical additives is based on the data obtained from the testing of concrete mixtures and the final conglomerate. In order to determine the effect of the type of chemical admixture used on the paving properties of the self-compacting concrete mixture, a series of experiments had to be carried out.
Based on the results of the performed tests, the results were obtained as shown in Table 5. Based on the obtained results, it is possible to highly evaluate the effect of the RSE hyperplasticizer in SCC. However, it is microsilica that should be used to obtain high strength characteristics of SCC.
Исследование влияния мелких наполнителей из техногенных отходов и различных химических добавок на удобоукладываемость самоуплотняющегося бетона и прочность бетонной матрицы // Комплексное использование минеральных ресурсов.
Calcium nitrate generating out of nitrogen-acid solutions after breaking up slurries of titanium
Sludge leaching was performed at different concentrations of nitric acid, which studied the dynamics of the degree of titanium and calcium extraction in the solution. The dependence of the titanium and calcium extraction in solution on the solid to liquid. The dependence of the main components extracted in the solution on the temperature of 3.5 mol.
The conditions of experiments and the composition of the solutions with the addition of milk of lime are shown in Table 2. An increase in the deposition time of impurities also positively affects the cleaning of the solution. But when ammonia was added from the solution, iron oxide flakes remained in the form of nitrate, the pH of the solution was 8.
The composition of the calcium nitrate salt was studied using a JEOL JXA 8230 electronic probe microanalysis. Thus, dehydrated calcium nitrate was obtained by granulating the 92-95% melt in the form of flakes. Calcium nitrate crystals were obtained from the purified solution at pH 8 with the addition of ammonium nitrate in an amount of 5% of the total weight of calcium nitrate obtained.
The dehydrated calcium nitrate was obtained by granulating 92-95% of the melt in the form of flakes at a granulator plate surface temperature of 90°C.
Разработка энергосберегающего способа для переработки техногенных отходов
Таблица 1 Сравнительные результаты экспериментов для барботажного слоя, кипящего слоя расплава и слоя расплава инверсии фаз при переработке «бедных» по цинку шлаков
Результаты экспериментов дляслоя расплава инверсии фаз при переработке «богатых» по цинку шлаков
3, характер изменения энергии Гиббса при образовании сложных молекул Zn2SiO4 и ZnFe2O4 из простых молекул - ZnO, SiO2, Fe2O3. Среднее значение константы равновесия (К) реакций образования сложных молекул из простых компонентов (табл. 3, пп. 4, 5) на два порядка (~ в 100 раз) больше, чем у реакции распада сложных молекул к простым (табл. 3, п. .1,2). Совмещенная вельц-печь РИФ-ТП - Вельц-печь Лениногорского полиметаллического комбината, холодная шлаковая переработка: Д Д 70м 5м, технологический объем печи 816 м3, среднесуточная производительность по шлаку 750 тонн.
Техногендік қалдықтарды өңдеудің энергияны үнемдейтін әдісі – инверсия сатысы балқытылған қабаттың «мінсіз» араластыру және «мінсіз» орын ауыстыру режимдерінің қосындысы ретінде әзірленді. Осының негізінде жаңа буын балқыту қондырғысы – «кері фазалық реактор – құбырлы пеш» құрылды. Эксперименттік мәліметтер кері фазалық қабаттағы мырыштың «нашар» және мырыштың «бай» қожын өңдеуге арналған отынның үлестік шығыны шамамен бірдей екенін көрсетеді. 34; «арық» қожды өңдеуге арналған «кері фазалы реакторлы құбырлы пеш» қондырғысының өнеркәсіптік үлгісін енгізген жағдайда кәдімгі отынның үлестік шығыны 1,5-1,7 есеге төмендейді және меншікті өнімділік 1 есеге төмендейді. Өнеркәсіпке «кері фазалық реакторлы құбыр пеші» қондырғысы енгізілгенде ол 4-1,5 есе артады.
An energy-saving method for the processing of technogenic waste has been developed - a melting layer with an inversion phase as a combination of "ideal" mixing and "ideal" displacement regimes. On its basis, a new generation of fusion unit was created - "reactor inversion stage - rotary furnace". Experimental data show that in the inversion phase layer, the specific fuel consumption for the processing of "poor" zinc slag and "rich" zinc slag is approximately the same.
The industrial realization of the "reactor inverted phase rotary kiln" would enable the cost-effective processing of landfill fume slag, Waelz clinker, "poor" zinc ores, tailings and other non-ferrous metal wastes.
АРАЛАС СОПОЛИМЕРЛЕРДІҢ ЦЕМЕНТТІ ЕРІТІНДІНІҢ ФИЗИКА-
СИРЕК КЕЗДЕСЕТІН ЭЛЕМЕНТТЕРМЕН БАЙЛАНҒАН МЫРЫШ ОКСИДІНІҢ
ТАЗАРТЫЛҒАН ФЕРРОХРОМНЫҢ ҚОЖЫН КҮЙДІРІЛГЕН ЖӘНЕ
КАРБОНАЗАЦИЯЛАНҒАН ҚҰРЫЛЫС БҰЙЫМДАРДЫ ЖАСАУ АРҚЫЛЫ
БРОМ-БРОМИД ЖҮЙЕСІНЕН АЛТЫН, КҮМІС, ПАЛЛАДИЙ, ПЛАТИНАНЫ
ПЛАСТИФИКАТОРЛАР МЕН ТЕРМОПЛАСТИКАЛАРДЫҢ ЭПОКСИДТІ ЖӘНЕ КӨМІРТЕКТІ ТАЛШЫҚТАРДЫҢ МЕХАНИКАЛЫҚ ҚАСИЕТТЕРІНЕ ӘСЕРІН
CТАЦИОНАРЛЫ ЖӘНЕ СТАЦИОНАРЛЫ ЕМЕС ТОКТАРМЕН
ӨНДІРІСТІК ҚАЛДЫҚТАР МЕН ХИМИЯЛЫҚ ҚОСПАЛАРДАН БӨЛІНГЕН ТОЛТЫРҒЫШТАРДЫҢ ӨЗДІГІНЕН ТЫҒЫЗДАЛАТЫН БЕТОННЫҢ ҚАСИЕТІНЕ
ТИТАН ӨНДІРІСІНДЕГІ ҚОҚЫРЛАРДЫ АШУ БАРЫСЫНДА ТҮЗІЛГЕН
ӨНЕРКӘСІПТІК ҚАЛДЫҚТАРДЫ ӨҢДЕУДІҢ ЭНЕРГИЯ ҮНЕМДЕЙТІН ӘДІСІН
ВЛИЯНИЕ СМЕСЕВЫХ СОПОЛИМЕРОВ НА ФИЗИКО-МЕХАНИЧЕСКИЕ
СИНТЕЗ ВЫСОКОДИСПЕРСНЫХ ФОРМ ОКСИДА ЦИНКА ЛЕГИРОВАННЫХ
СИНТЕЗ И ХАРАКТЕРИСТИКА ВИНИЛАЦЕТАТНЫХ ПРИВИВОЧНЫХ
УТИЛИЗАЦИЯ ШЛАКА РАФИНИРОВАННОГО ФЕРРОХРОМА С ПОЛУЧЕНИЕМ
ВЫЩЕЛАЧИВАНИЕ ЗОЛОТА, СЕРЕБРА, ПАЛЛАДИЯ И ПЛАТИНЫ ИЗ
ИССЛЕДОВАНИЕ ВЛИЯНИЯ ПЛАСТИФИКАТОРОВ И ТЕРМОПЛАСТОВ НА МЕХАНИЧЕСКИЕ СВОЙСТВА ЭПОКСИДНОЙ СМОЛЫ И УГЛЕПЛАСТИКА
ФОРМИРОВАНИЕ СУЛЬФАТОВ ЖЕЛЕЗА ПРИ ПОЛЯРИЗАЦИИ
ИССЛЕДОВАНИЕ ВЛИЯНИЯ МЕЛКОДИСПЕРСНЫХ НАПОЛНИТЕЛЕЙ ИЗ ТЕХНОГЕННЫХ ОТХОДОВ И ХИМИЧЕСКИХ ДОБАВОК НА СВОЙСТВА
ПОЛУЧЕНИЕ КАЛЬЦИЕВОЙ СЕЛИТРЫ ИЗ АЗОТНОКИСЛЫХ РАСТВОРОВ ОТ
РАЗРАБОТКА ЭНЕРГОСБЕРЕГАЮЩЕГО СПОСОБА ДЛЯ ПЕРЕРАБОТКИ
THE EFFECT OF BLEND COPOLYMERS ON PHYSICO-MECHANICAL PROPERTIES
SYNTHESIS OF FINELY DISPERSED FORMS OF ZINC OXIDE DOPED WITH RARE- EARTH ELEMENTS (REVIEW)
SYNTHESIS AND CHARACTERIZATION OF VINYL ACETATE GRAFT
DISPOSAL OF SLAG OF REFINED FERROCHROMIUM BY OBTAINING A
SILVER, GOLD AND PALLADIUM LEACHING FROM ELECTRONIC SCRAP USING BROMINE- BROMIDE SOLUTION
STUDY OF THE EFFECT OF PLASTICIZERS AND THERMOPLASTICS ON THE MECHANICAL PROPERTIES OF EPOXY AND CARBON FIBER REINFORCED
IRON SULPHATES PRODUCTION BEING POLARIZED BY THE DIRECT AND
STUDY OF THE INFLUENCE OF FINE FILLERS FROM TECHNOGENIC WASTE AND CHEMICAL ADDITIVES ON THE PROPERTIES OF SELF-COMPACTING
CALCIUM NITRATE GENERATING OUT OF NITROGEN-ACID SOLUTIONS AFTER BREAKING UP SLURRIES OF TITANIUM PRODUCTION
DEVELOPMENT OF ENERGY-EFFICIENT METHOD FOR PROCESSING
![Fig. 1. The logα Br2 – pH diagram for the bromine – water system at 298K [9].](https://thumb-ap.123doks.com/thumbv2/azdokorg/10955772.0/37.892.474.787.108.348/fig-logα-br2-ph-diagram-bromine-water-298k.webp)
![Fig. 2. [10] Dependence of the distribution coefficient of bromine H between the gas phase and bromide solutions](https://thumb-ap.123doks.com/thumbv2/azdokorg/10955772.0/37.892.507.806.841.1078/fig-dependence-distribution-coefficient-bromine-phase-bromide-solutions.webp)
