An Analysis of Limestone Gypsum Desulfurization Systems

2012 ◽  
Vol 550-553 ◽  
pp. 667-670
Author(s):  
Chun Yu Wang ◽  
Jian Qiu Liu ◽  
Peng Guo
Keyword(s):  
Particle Size ◽  
Internal Structure ◽  
Ph Value ◽  
Chloride Ion ◽  
Electric Utility ◽  
High Quality ◽  
Structure Control

Limestone-gypsum desulfurization (LGD) technique is rather popular with the Electric Utility industries in their desulfuration operation. It’s been proved that, Control of PH Value and the concentration of gypsum may prevent scaling. Adoption of rubber or plastic linings based on the medium traits and the types of desulfuration system can prevent corrosion. Simple internal structure, control of pH Value of absorption liquid between 5.6 ~ 5.8, and limestone of the particle size ≤325 meshes particle above 90% may raise the efficiency of absorption tower, and promote its longevity. Control of the concentration of Chloride ion (Cl-) may guarantee a high quality of gypsum products.

Influence of technology parameters of free-cutting steel continuous casting on the billet internal structure

2020 ◽  
Vol 76 (2) ◽  
pp. 139-142
Author(s):  
A. T. Kunakbaeva ◽  
A. M. Stolyarov ◽  
M. V. Potapova
Keyword(s):  
Regression Analysis ◽  
Continuous Casting ◽  
Internal Structure ◽  
Sulfur Content ◽  
Manganese Content ◽  
High Quality ◽  
Correlation And Regression Analysis ◽  
Cutting Steel ◽  
Continuously Cast

Free-cutting steel gains specific working properties thanks to the high content of sulfur and phosphorus. These elements, especially sulfur, have a rather high tendency to segregation. Therefore, segregation defects in free-cutting steel continuously cast billets can be significantly developed. The aim of the work was to study the influence of the chemical composition of freecutting steel and casting technological parameters on the quality of the macrostructure of continuously cast billets. A metallographic assessment of the internal structure of cast metal made of free-cutting steel and data processing by application of correlation and regression analysis were the research methods. The array of production data of 43 heats of free-cutting steel of grade A12 was studied. Steel casting on a five-strand radial type continuous casting machine was carried out by various methods of metal pouring from tundish into the molds. Metal of 19 heats was poured with an open stream, and 24 heats – by a closed stream through submerged nozzles with a vertical hole. High-quality billets had a cross-sectional size of 150×150 mm. The macrostructure of high-quality square billets made of free-cutting steel of A12 grade is characterized by the presence of central porosity, axial segregation and peripheral point contamination, the degree of development of which was in the range from 1.5 to 2.0 points, segregation cracks and strips – about 1.0 points. In the course of casting with an open stream, almost all of these defects are more developed comparing with the casting by a closed stream. As a result of correlation and regression analysis, linear dependences of the development degree of segregation cracks and strips both axial and angular on the sulfur content in steel and on the ratio of manganese content to sulfur content were established. The degree of these defects development increases with growing of sulfur content in steel of A12 grade. These defects had especially strong development when sulfur content in steel was of more than 0.10%. To improve the quality of cast metal, it is necessary to have the ratio of the manganese content to the sulfur content in the metal more than eight.

scholarly journals Synthesis of High-Quality Carboxyl End-Functionalized Poly(3-hexylthiophene)/CdSe Nanocomposites

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
He-Ping Shi ◽  
Da-Wei Lin ◽  
Rui-feng Wu
Keyword(s):  
Particle Size ◽  
Charge Transfer ◽  
Crystalline Structure ◽  
Environmentally Friendly ◽  
Cdse Nanocrystals ◽  
High Quality ◽  
Efficient Charge ◽  
Controllable Particle Size ◽  
Better Than

Carboxyl end-functionalized poly(3-hexylthiophene) (P3HT-COOH) was grafted chemically with CdSe nanocrystals (NCs) by a phosphine-free method. The particle quality of P3HT-COOH/CdSe nanocomposites was better than that of P3HT/CdSe nanocomposites, which were synthesized using the same method. Nanocrystals with controllable particle size exhibited a wurtzite crystalline structure and showed excellent nanocrystal dispersion in the P3HT-COOH matrix. Photoluminescence (PL) characterization performed on nanocomposites suggested the efficient charge transfer at the P3HT-COOH/CdSe interface. This approach based on the phosphine-free method is not only environmentally friendly but also highly efficient.

scholarly journals Ultrasonic atomizing-assisted spray drying: Effect on the quality of skimmed milk powders

2018 ◽  
Author(s):  
Yuchuan Wang ◽  
Ying Cui ◽  
Bo Wang ◽  
Min Zhang
Keyword(s):  
Particle Size ◽  
Spray Drying ◽  
Milk Powder ◽  
High Quality ◽  
Ultrasonic Atomization ◽  
Atomization Spray ◽  
L Value ◽  
Skimmed Milk ◽  
Spray Dried

Skimmed milk powders (SMP) were produced by ultrasonic atomizing-assisted spray drying (UASD). It was found that UASD can produce high quality SMP (with < 5% moisture content and < 2% insolubility) at lower inlet temperatures (~130℃). The particle size of the UASD-SMP was 10 times smaller (decreased from ~20 µm to 4 µm) than the tranditionally spray-dried SMP and the color appeal of UASD-SMP was also better (L* value increased by > 6 %). Overall, this research shown that UASD can be used to produce small particle size and high quality SMP. Keywords: Skimmed milk powder; ultrasonic atomization; spray dryer; particle size distribution; color  

The Research on Electroplating Technology Used for RF Micro Inductor Coil

2015 ◽  
Vol 645-646 ◽  
pp. 783-789
Author(s):  
Rui Ke Bi ◽  
Xiu Yan Wei ◽  
Jing Lin Wu ◽  
Hang Guo
Keyword(s):  
Ph Value ◽  
Coating Layer ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Technological Parameters ◽  
High Quality ◽  
Pulse Electroplating ◽  
Inductor Coil ◽  
Plating Layer

In this paper, we focus on the electroplating technology used for RF micro inductor coil. The technological parameters in DC electroplating are determined by SEM, linear sweep voltammetry and so on. It turns out that a high quality of plating layer is obtained when the PH value of electrochemical solution is 9, temperature is 45°C,current density is 1 A/dm2, additive is added and stirred slowly. Then the research on pulse electroplating is conducted on the basis of DC electroplating, and the result indicates that the pulse plating layer is of better quality compared with DC plating layer. Afterwards, surface structure and resistance of the copper layer are analyzed, demonstrating the obtained coating layer is good enough to be the main structure of micro inductor coil. In the end, this electroplating technology is applied to micro inductor coil. The simulation, fabrication, package and test of micro inductor coil are introduced briefly.

scholarly journals Studying the influence of properties of initial ZrO2-(7 %)Y2O3 powders on properties of ceramic products

2019 ◽  
pp. 44-50
Author(s):  
N. V. Zhirenkina ◽  
M. A. Mashkovtsev ◽  
N. V. Obabkov ◽  
I. F. Zakirov
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Zirconium Oxide ◽  
Ph Value ◽  
Slip Casting ◽  
Mechanical Grinding ◽  
Influence Of Properties ◽  
Influence Of Ph ◽  
Research Show

The paper focuses on the possibility of forming ceramic products by the method of slip casting without the stage of mechanical grinding of powders. We studied the influence of pH value of hydroxides precipitation and hydrothermal treatment on the properties of ZrO2-(7 %)Y2O3 powders, and on the mechanical properties of ceramic products made from synthesized ZrO2-(7 %)Y2O3 powders without a grinding stage. Findings of research show that the quality of ceramic products based on zirconium oxide is more influenced by the specific surface area, rather than the particle size of the initial powders

scholarly journals Experimental Investigation of Chloride Uptake Performances of Hydrocalumite-Like Ca-Al LDHs with Different Microstructures

2020 ◽  
Vol 10 (11) ◽  
pp. 3760
Author(s):  
Shupeng Zhang ◽  
Feng Yu ◽  
Wenting He ◽  
Dapeng Zheng ◽  
Hongzhi Cui ◽  
...  
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Average Particle Size ◽  
Chloride Ion ◽  
Average Particle ◽  
Chloride Uptake ◽  
Reaction Solution ◽  
Interlayer Anion ◽  
Double Hydroxides

In this study, hydrocalumite-like Ca2Al-NO3− layered double hydroxides (Ca-Al LDHs) with different microstructures were synthesized. The crystalline properties, structure composition, morphology and particle size distribution of the Ca-Al LDH (CAL) samples were illustrated. To obtain the chloride uptake performances of CAL, the influences of contact time, initial concentration of Cl−, pH of reaction solution and coexistence anions on the chloride uptake were examined systematically. Compared to the CAL samples obtained at a higher aging temperature, CAL synthesized at 60 °C demonstrated the minimum average particle size (6.148 μm) and the best Cl− adsorption capacity (211.324 mg/g). Based on the test results, the main adsorption mechanism of chloride ion on CAL was recognized as an interlayer anion exchanging reaction other than the dissolution-precipitate mode. With the increase in the pH value of reaction solution from 7 to 13, it was found that the amount of chloride ion adsorbed by CAL increased slightly, and the solution could remain at relatively high pH value even after the adsorption. The presence of CO32− and SO42− reduced the adsorption capacity of CAL dramatically as compared with OH− due to the destruction of layered structure and the formation of precipitates (CaCO3 or CaSO4). The interference sequence of the investigated anions on the chloride uptake of CAL was SO42−, CO32− and OH−, and the order of interlayer anionic affinity was Cl− > OH− > NO3−. The results illustrated that the synthesized CAL could be used as a promising chloride ion adsorbent for the corrosion inhibition of reinforcement embedded cement-based materials.

Preparation of Ammonium Iron Blue from Copperas and Ammonium Sulfate Wasted Liquid

2014 ◽  
Vol 898 ◽  
pp. 443-446 ◽  
Author(s):  
Feng Chen ◽  
Ming Yu Li
Keyword(s):  
Particle Size ◽  
Ammonium Sulfate ◽  
Ferrous Sulfate ◽  
Ammonia Oxidation ◽  
Ph Value ◽  
Total Iron ◽  
Experimental Result ◽  
Total Iron Content ◽  
Ammonium Iron

Ammonium iron blue was prepared with ferrous sulfate and ammonium sulfate wasted liquid, ferrous sulfate is a byproduct from titanium dioxide production, and ammonium sulfate waste liquid is produced by ammonia oxidation iron oxide red. The influence of some parameters such as n (FeSO4)/n (Na4Fe (CN)6) ratio, PH value , reaction time, reaction temperature were discussed. The total iron content of ammonium iron blue is 35.89% and the quality of ammonium iron blue was accorded with the industrial standard (HG/T 3001-1999). SEM experimental result proved that the particle size of ammonium iron blue was uniform and about 100-200nm, and the structure of ammonium iron blue is Straight edges polyhedron. XRD experimental result showed that the structure of ammonium iron blue was similar to Fe [Fe (CN)]3.

Quality of nixtamalized, sprouted and baked multigrain chips

2018 ◽  
Vol 48 (3) ◽  
pp. 453-467
Author(s):  
Dipika Agrahar-Murugkar ◽  
Aiman Zaidi ◽  
Shraddha Dwivedi
Keyword(s):  
Particle Size ◽  
Design Methodology ◽  
Nutritive Value ◽  
Textural Properties ◽  
High Quality ◽  
Content Type ◽  
Overall Acceptability ◽  
Pre Treatment ◽  
Hedonic Scale

Purpose The purpose of the study was to discover whether incorporating flours with high nutritive value along with pre-treatment of cereals with nixtamalization and sprouting of legumes would result in a high-quality healthy alternative for corn-based snacks. Design/methodology/approach Flours of nixtamalized cereals-corn, wheat, rice and sorghum and sprouted legumes-soybean and green gram are made into dough and baked instead of fried to form multi-grain chips. The particle size and physical properties of flour and nutritional, functional and textural properties of dough and chips are tested to study the effect of combination of nixtamalization of cereals and sprouting of legumes in the development of chips. Findings Baked multi-grain chips made of nixtamalized cereals and sprouted legumes had a significantly (p < 0.05) smaller particle size of 24.6 µm compared to T1 24.8 µm, C1 29.3 µm and C2 31.7 µm. T2 and C2 had significantly (p = 0.05) lower OAC value than C1 and T1 due to nixtamalization as nixtamalized flour needed half the amount of oil during dough formation. T1 showed highest calcium (mg/100 g) of 466 which was significantly (p < 0.05) higher than all other groups. The overall acceptability of T2 (8.6) was significantly (p < 0.05) higher than T1 (7.8), C2 (7.4) and C1 (6.8) on the nine-point Hedonic scale. Originality/value The developed chips are superior in terms of higher protein and minerals with better organoleptic acceptability and lower fat content in comparison to both corn chips and nixtamalized corn chips. The multi-grain chip therefore offers a new option for the consumer in high-quality healthy alternative to corn-based fried snacks.

Experience of clinical testing of personal telemedicine system ‘Obereg’ for remote monitoring of patients in intensive care units

2020 ◽  
pp. 52-58 ◽  
Author(s):  
A. A. Eryomenko ◽  
N. V. Rostunova ◽  
S. A. Budagyan ◽  
V. V. Stets
Keyword(s):  
Intensive Care ◽  
Intensive Care Units ◽  
Remote Monitoring ◽  
Clinical Testing ◽  
Transportation Of Patients ◽  
High Quality ◽  
Telemedicine System ◽  
Accuracy Of Measurements ◽  
Hospital Equipment

The experience of clinical testing of the personal telemedicine system ‘Obereg’ for remote monitoring of patients at the intensive care units of leading Russian clinics is described. The high quality of communication with the remote receiving devices of doctors, the accuracy of measurements, resistance to interference from various hospital equipment and the absence of its own impact on such equipment were confirmed. There are significant advantages compared to stationary patient monitors, in particular, for intra and out-of-hospital transportation of patients.

Storage Problems of Poplar Chips from Short Rotation Plantations with Special Emphasis on Fungal Development

2012 ◽  
Vol 8 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Zsuzsanna Horváth ◽  
Béla Marosvölgyi ◽  
Christine Idler ◽  
Ralf Pecenka ◽  
Hannes Lenz
Keyword(s):  
Particle Size ◽  
Health Risk ◽  
Dry Matter ◽  
Ph Value ◽  
Wood Chips ◽  
Raw Material ◽  
Special Focus ◽  
Fungal Development ◽  
Short Rotation ◽  
Fungal Particles

Abstract - There are several problems in storing wood chips freshly harvested from short rotation plantations, which result in quality losses as well as in dry matter and energy losses. The factors influencing the degradation of raw material are examined in this paper with special focus on fungal development. An excessive growth of fungi is connected to dry matter losses and also to an increased health risk during raw material handling. The following factors were measured during 6 months storage of poplar wood chips depending on particle size: box temperature, moisture content, pH-value, appearance of fungi in the storage and the concentration of fungal particles in the air. The results show a close connection between particle size, temperature and attack of fungi. During the storage mesophilic and termophilic species of the genera Alternaria, Aspergillus, Cladosporium, Mucor and Penicillium appeared. The concentration of fungal particles is the highest for fine chips and decreases in bigger particles. There was a special focus on the investigation of the properties of coarse chips (G 50), which represent a good compromise between handling, storage losses and health risk due to fungal development.

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