ANALYSIS OF THE WAYS OF GRINDING OF BEAN CULTURES SEEDS

2021 ◽  
Author(s):  
Н.А. ТАРАСЕНКО ◽  
Р.Л. ПЛОМОДЬЯЛО ◽  
Д.Ю. БОЛГОВА ◽  
Н.С. БЫКОВА ◽  
Н.С. АТАЯН
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Raw Materials ◽  
Metal Carbide ◽  
Biological Value ◽  
Average Value ◽  
High Effect ◽  
Roll Mill ◽  
Uniform Particle Size ◽  
Roll Crusher

Рассмотрены способы измельчения семян люпина и эспарцета на существующем в кондитерском производстве оборудовании – дезинтеграторе, валковой дробилке и трехвалковой мельнице с целью повышения эффективности дробления семян бобовых культур и, как следствие, их биологической ценности после дезинтегральной обработки. Установлено, что с увеличением зазора между валками возрастает среднее значение размеров дробленых частиц, т. е. доля крупных фракций увеличивается, мелких – снижается, при этом дисперсия существенно не меняется. При использовании валковой дробилки, варьируя величину зазора между валками и частоту вращения, можно оптимизировать режим дробления. Доказано, что применение для дробления семян вертикальной трехвалковой мельницы с засыпанными в нее вместе с семенами бобовых культур металлическими твердосплавными шарами за счет комбинаций ударных и истирающих воздействий на частицы семян интенсифицирует процесс, снижает время помола и способствует получению равномерного гранулометрического состава, обеспечивая высокий эффект измельчения сырья с сохранением его качественных показателей. The ways of grinding of seeds lupine and cock's head on the existing in the confectionery industry equipment, disintegrator, roller crusher and three-roll mill with the purpose of increase of efficiency of the grinding bean cultures seeds and, consequently, their biological value after disintegrating treatment were considered. It is established that with increase in gap between the rolls, the average value of the sizes of crushed particles increase, i.e. the share of large fractions increases, small – decreases, this variance does not change significantly. When using roll crusher, by varying the size of the gap between the rolls and the rotational speed can optimize the crushing mode. It is proved that use for crushing seeds vertical three-roll mill with filled in it along with the seeds of legumes metal carbide balls due to the combinations of impact and abrasive effects on the particles of seed intensifies process reduces grind time and helps to ensure a uniform particle size distribution, providing a high effect grinding of raw materials while maintaining its quality.

scholarly journals Phase evolution, characterisation, and performance of cement prepared in an oxy-fuel atmosphere

2016 ◽  
Vol 192 ◽  
pp. 113-124 ◽  
Author(s):  
Liya Zheng ◽  
Thomas P. Hills ◽  
Paul Fennell
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Carbon Capture ◽  
Raw Materials ◽  
Carbon Capture And Storage ◽  
Phase Evolution ◽  
Chemical Compositions ◽  
Phase And Elemental Compositions

Cement manufacture is one of the major contributors (7–10%) to global anthropogenic CO2 emissions. Carbon capture and storage (CCS) has been identified as a vital technology for decarbonising the sector. Oxy-fuel combustion, involving burning fuel in a mixture of recycled CO2 and pure O2 instead of air, makes CO2 capture much easier. Since it combines a theoretically lower energy penalty with an increase in production, it is attractive as a CCS technology in cement plants. However, it is necessary to demonstrate that changes in the clinkering atmosphere do not reduce the quality of the clinker produced. Clinkers were successfully produced in an oxy-fuel atmosphere using only pure oxides as raw materials as well as a mixture of oxides and clay. Then, CEM I cements were prepared by the addition of 5 wt% gypsum to the clinkers. Quantitative XRD and XRF were used to obtain the phase and elemental compositions of the clinkers. The particle size distribution and compressive strength of the cements at 3, 7, 14, and 28 days' ages were tested, and the effect of the particle size distribution on the compressive strength was investigated. Additionally, the compressive strength of the cements produced in oxy-fuel atmospheres was compared with those of the cement produced in air and commercially available CEMEX CEM I. The results show that good-quality cement can be successfully produced in an oxy-fuel atmosphere and it has similar phase and chemical compositions to CEM I. Additionally, it has a comparable compressive strength to the cement produced in air and to commercially available CEMEX CEM I.

scholarly journals Investigation of Microbial Contamination and Physicochemical Properties of Compounded Medications in Pharmacies

2020 ◽  
Vol 26 (1) ◽  
pp. 82-93
Author(s):  
Reihaneh Radmanesh ◽  
◽  
Mohsen Nabi Meybodi ◽  
Vahid Ramezani ◽  
Maryam Akrami ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Microbial Contamination ◽  
Raw Materials ◽  
Chemical Properties ◽  
Pharmaceutical Product ◽  
Physical And Chemical ◽  
Made In ◽  
And Chemical Properties

Aims: Any pharmaceutical product made in pharmacy, hospital or factory may be contaminated with microbes. This contamination can originate from raw materials or during production. Hence, it is important to study the physical and chemical properties and stability of compounded drugs. Methods & Materials: In this study, first a specific sample of prescribed medication was ordered from 63 pharmacies in Yazd, Iran. After collecting the samples, the amount of microbial contamination, viscosity and particle size distribution and their stability were investigated and their results were compared to the standard levels. Findings: Based on the results, 31.7% of the samples had discoloration and 23.8% showed creaming phenomenon. In terms of particle size distribution, 57.1% of the samples had a 20-40 μm particle size and 49.2% had a viscosity equal to 2500-3000 centipoise. Regarding stability, 12.6% of the samples underwnet phase change at 30-40°C. About of the amount of hydroquinone in samples, 35% had acceptable amount. In 23.8% of the samples, fungal infection was observed. Conclusion: Contrary to a popular belief that the compounded medicines produced in pharmacies have microbial contamination, the results of this study showed that the microbial contamination of these compounded medications is low.

Preparation and Properties of Cross-Linked Polysiloxane Microspheres for Light-Scattering

2017 ◽  
Vol 896 ◽  
pp. 57-61
Author(s):  
Ming Shan Yang ◽  
Peng Wei Yin ◽  
Hong Liang Tong
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Ph Value ◽  
Raw Materials ◽  
Narrow Particle Size Distribution ◽  
Vinyl Silane ◽  
Oil Water ◽  
Water Ratio

The narrow particle size distribution of poly (vinyl silicone) microspheres were prepared by the hydrolysis-polycondensation method with vinyl silane (VTMS) as raw materials. And the influences of pH value, oil/water ratio on the morphology, particle size and distribution of the microspheres were studied. The results shows that the particle size of microspheres decrease with the increasing of the PH value of polymerization, and the particle size has no specific linear relationship with the PH value of hydrolysis reaction, while the oil-water ratio is smaller, single particle size distribution is more narrow, more uniform distribution.

Combustion Synthesis of β-SiAlON Using 3D Ball Milling

2017 ◽  
Vol 898 ◽  
pp. 1717-1723 ◽  
Author(s):  
Xue Mei Yi ◽  
Shota Suzuki ◽  
Xiong Zhang Liu ◽  
Ran Guo ◽  
Tomohiro Akiyama
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Combustion Synthesis ◽  
Ball Mill ◽  
Raw Materials ◽  
Raw Material ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Material Particle

Combustion synthesis (CS) of β-SiAlON was conducted using a 3D ball mill, with a focus on the effect of the 2D/3D ball mill premixing conditions on the CS raw material particle size as well as on the yield and grain shape of the final products. The results showed that the particle size distribution of the raw materials was significantly affected by the premixing conditions. Various particle sizes and particle size distributions could easily be obtained by using a 3D mill instead of a 2D mill due to the complex biaxial rotation movement of 3D milling. The particle size was more sensitive to the rotation ratio (vertical spin/horizontal spin, Vv/Vh) than the rotation rate when using 3D milling. Finally, β-SiAlON with less than 5 mass% unreacted Si was obtained using premix milling conditions of 135×200 [vertical spin (rpm) × horizontal spin (rpm)]. The grain shapes of the final products were clearly influenced by the particle size distribution of the raw mixtures.

Research of the Particle Gradation Technology of Components in PBX Explosive Based on CPM Model

2015 ◽  
Vol 727-728 ◽  
pp. 366-369
Author(s):  
Qiu An Huang ◽  
Geng Guang Xu ◽  
Jian Yu Chen
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Relative Error ◽  
Fine Particles ◽  
Raw Materials ◽  
Maximum Value ◽  
Packing Model ◽  
Packing Efficiency ◽  
Compressible Packing Model

Basedon the assumption of related parameters in compressible packing model, thecompressible packing model was used for the calculation of the explosivespacking efficiency. The accuracy of the calculation was verified by experimentsand the relative error was 2.49%. Besides, the influence of content offineparticles and particle size distribution in explosives on stacking efficiencywas discussed. The results show that the stacking efficiency was increasingwith the particle size distribution increasing from 0~300μm to 0~700μm. Thepacking efficiency reached it’s maximum value when we only increased thecontent of fine particles to 40%. Therefore, the packing efficiency has arelation with particle size distribution of raw materials.

scholarly journals MONITORING OF BASIC PARAMETERS OF SOIL FERTILITY USING GEOINFORMATION SYSTEMS

2020 ◽  
Vol 15 (2) ◽  
pp. 96-101
Author(s):  
Il'ya Kostin ◽  
Elena Malysheva
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Soil Fertility ◽  
Size Distribution ◽  
Weighted Average ◽  
Relative Index ◽  
Soil Cultivation ◽  
Average Value ◽  
The Difference ◽  
High Level

The studies were carried out with the aim of developing and implementing a module for determining the degree of cultivation and soil quality for geographic information systems using the example of “GIS Agroecologist Online”. The geoinformation system database includes a reference book of soil bonitet, depending on the type of soil, particle size distribution and degree of erosion. Based on this directory, the weighted average soil tolerance is calculated for the site. Soil subtypes that fall within the boundaries of the site can be viewed using the appropriate cartogram, as well as in the interface for viewing the soil erosion characteristics of the site, which displays information about the area of each soil subtype and its bonitet, the prevailing degree of erosion and particle size distribution. The calculation of the culture index is carried out in 2 stages according to the method of T.N. Kulakovskaya. First, a relative index is calculated for each indicator used to assess fertility, which is the ratio of the difference between the actual and minimum index to the difference between the optimal and minimum values of the indicator. At the second stage, the soil cultivation index is calculated, which is calculated as the average value of all relative indices. Based on the results of calculating fertility indicators for each site, a cartogram of the degree of cultivation is automatically built, which can be viewed in the context of the district, organization and department. On the cartogram, you can clearly see areas with each degree of cultivation. A high and medium soil cultivation index indicates a high level of fertility, and a very low and low indicates possible problems. Using this cartogram, it is easy to identify problem areas, if any. When monitoring the main indicators of soil fertility, this functionality is used for each cycle of agrochemical examination. This functionality can also be used in determining the cadastral value of the plot

scholarly journals Characterization of Minim-Martap Bauxite and Its Extracted Alumina

2018 ◽  
Vol 4 (4) ◽  
pp. 598-600
Author(s):  
Parfait Aristide Zé ◽  
Cornelius Tsamo ◽  
Richard Kamga
Keyword(s):  
Particle Size ◽  
Relative Humidity ◽  
Ir Spectroscopy ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Acid Treatment ◽  
Raw Materials ◽  
Industrial Processes ◽  
Loss On Ignition

Due to their chemical and mineralogical properties bauxites are composites with multiple applications. In this work, the properties of bauxite collected from Minim-Martap and its extracted alumina were evaluated. Alumina was extracted by adapting the Bayer process at laboratory scale while the characteristics of bauxite and alumina were variably characterized by determining the particle size distribution, relative humidity, loss on ignition, pH, EC, CEC, PZC, XRD, IR, and DSC-TGA. These results show that Minim-Martap bauxite gray bauxite with easily extractable alumina. This bauxite is acidic with a pH of 6.05, PZC of 6.91 and CEC of 15 Meq/100 g which is closer to that of kaolinite clays. This result was confirm by XRD which shows two types of kaolinites: Al2Si2O5(OH)4 with 83.24% and H4Al2Si2O9 with 42.47%, mullite Al2.25Si0.75O4.875 with 67.32%, gibbsite (H2SiO4) with 83.92%. The bauxite is hydroscopic as evident from its humidity results. The IR spectroscopy of bauxite and alumina shows the presence of Al-OH and Si-OH which increase with acid treatment. Minim-martap bauxite and its extracted alumina can be used as raw materials for many industrial processes because of the different properties they possess as revealed by this study.

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