scholarly journals Dispersed filler based on synthetic calcium carbonate – requirements for applications quality

2021 ◽  
Vol 83 (1) ◽  
pp. 303-308
Author(s):  
E. S. Natarova ◽  
Y. M. Nehcesova
Keyword(s):  
Calcium Carbonate ◽  
Waste Product ◽  
Calcium Nitrate ◽  
Water Soluble ◽  
Mineral Fertilizers ◽  
Soluble Nitrogen ◽  
Calcium Nitrate Tetrahydrate ◽  
Vacuum Filter ◽  
Carbonate Production ◽  
Insoluble Precipitate

The introduction of fillers into various materials improves its technological, physical and mechanical properties, and leads to a decrease in cost. The main areas of application of natural and synthetic calcium carbonate as highly dispersed fillers are: the construction industry, the production of Portland cement, mineral fertilizers, glass, paper, polymer composite materials, paints and varnishes, and rubbers. A promising direction at present is the use of production by-products as fillers, for example, conversion calcium carbonate - a waste product from the production of a complex mineral fertilizer - nitroammophoska. However, its use in the above areas is limited by the content of water-soluble nitrogen-containing impurities, impurities of heavy metals, strontium carbonate, phosphates, etc. The analysis of scientific, technical and patent literature on methods of purification of conversion calcium carbonate has been carried out. These methods are based on the extraction of impurities from the initial product of calcium carbonate production - a melt of calcium nitrate tetrahydrate by precipitation with various reagents, followed by the isolation of an insoluble precipitate (impurities) and processing of the purified melt into calcium carbonate and nitroammofoska. A method is proposed for the extraction of acid-tonic-soluble iron-containing impurities from the initial calcium nitrate melt in order to obtain a cleaner by-product - conversion calcium carbonate, which will expand the scope of its application. An effective method is to dilute the initial calcium nitrate melt with a 60% solution of ammonium nitrate to a calcium content of 12-13%, followed by the isolation of an acid-insoluble precipitate in a vacuum filter, conversion of the purified calcium nitrate solution with ammonium carbonate and separation of the resulting suspension in a drum filter. The described method can reduce the amount of iron-containing impurities by more than 50%.

scholarly journals Tomato fertigation in an open ground

2019 ◽  
Vol 14 (4) ◽  
pp. 347-361
Author(s):  
Omariy Georgievich Chamurliev ◽  
Alexander Nikolaevich Sidorov ◽  
Anatoly Aleksandrovich Kholod ◽  
Georgy Omarievich Chamurliev ◽  
Natalia Vladimirovna Bogomolova
Keyword(s):  
Positive Impact ◽  
Plant Root ◽  
Soil Layer ◽  
Calcium Nitrate ◽  
Steppe Zone ◽  
Fertilizer Application ◽  
Water Soluble ◽  
Mineral Fertilizers ◽  
Chestnut Soils ◽  
Volgograd Region

Obtaining high and stable yields of tomato with good consumer qualities in the open field has now become problematic due to the fact that hybrids and varieties of tomato of an intensive type place high demands on the presence of moisture and nutrients in the root-soil layer. The required level of soil moisture in combination with the introduction of calculated doses of mineral fertilizers during the growing season provides for obtaining the planned yields of vegetables, including tomato. The most important resource for the further development of agriculture in the Russian Federation is irrigated land. Volgograd region is one of the largest irrigated agricultural regions in Russia. Growing of almost all vegetables in the region is conducted on irrigated lands. The use of only one irrigation without the use of fertilizers will not have a positive impact on the growth, development and productivity of plants. Fertigation is the most effective and economical way of delivering nutrients to the plant root system and allows to get a higher yields than other methods of fertilizer application. In fertigation systems, the control of optimal concentrations of fertilizers is easily achieved, their ratio and these parameters can be controlled automatically. The purpose of this work was to study the comparative efficiency of ammonium nitrate, calcium nitrate and a combination of calcium nitrate and ammonium chloride for tomato fertigation in combination with non-root dressings of complex water-soluble fertilizers containing macroand microelements in open feild on irrigated lighchestnut soil of dry steppe zone of chestnut soils in the Volgograd region. As a result, analysis of the use of mineral fertilizers for tomato fertigation in light chestnut soils of the Volgograd region was carried out. The positive effect of foliar dressing with microelements in the proposed dosages has been proven.

Aspects of the Use of Conversion Calcium Carbonate — the Solution of the Ecological Problem of Utilization

2018 ◽  
Vol 22 (10) ◽  
pp. 48-53
Author(s):  
L.V. Rudakova ◽  
S.I. Niftaliev ◽  
Yu.M. Neochesova ◽  
E.S. Natarova
Keyword(s):  
Heat Treatment ◽  
Calcium Carbonate ◽  
Calcium Nitrate ◽  
Total Content ◽  
Water Soluble ◽  
Insoluble Residue ◽  
Ecological Problem ◽  
Main Component ◽  
Positive Effect

Studies have been carried out to improve the quality of conversion calcium carbonate. The process of extraction of insoluble iron-containing impurities at the stage of obtaining calcium carbonate from calcium nitrate melt was studied. It has been determined that the preliminary removal of the acid-insoluble residue from the melt of Ca (NO3)2by filtration or settling allows the Fe2O3content to be reduced by more than 50 % in the form of magnetically susceptible impurities and further increases the whiteness of the final product. The effect of grinding and heat treatment of conversion calcium carbonate on the evolution of nitrogen-containing impurities is studied. It has been established that the amount of water-soluble substances in the sample increases exponentially with increasing shredding time of the material. Heat treatment can significantly reduce (in almost 3 times) the total content of water-soluble substances in the crushed product. Simultaneously with the removal of the "bound" nitrogen, the content of the main component increases by 1.5–2 %. A positive effect of heat treatment is also an increase in the rate of refinement of conversion calcium carbonate, which makes the dispersed composition of the product more homogeneous. A technological scheme for processing conversion calcium carbonate into a disperse filler with specified properties has been developed.

Water soluble nitrogen forms on two different soils as affected by biofertilization

2007 ◽  
Vol 35 (2) ◽  
pp. 597-600
Author(s):  
Ida Kincses ◽  
Tibor Filep ◽  
Péter Nagy ◽  
Andrea Kovács
Keyword(s):  
Water Soluble ◽  
Soluble Nitrogen ◽  
Nitrogen Forms ◽  
Different Soils

Удобрение перца сладкого

2018 ◽  
Author(s):  
V.A. Borisov ◽  
A.M. Menshikh ◽  
V.S. Sosnov ◽  
G.F. Monakhos
Keyword(s):  
Drip Irrigation ◽  
Sweet Pepper ◽  
Water Soluble ◽  
Mineral Fertilizers ◽  
High Quality ◽  
Organic Mineral ◽  
Soluble Fertilizer

Показано действие минеральных удобрений, микрокристаллического комплексного водорастворимого удобрения «Мастер» и органоминерального наноудобрения с ростостимулирующей активностью «Арксойл» при капельном орошении на урожайность и качество сладкого перца нового гибрида F1 Темп. Сочетание основного удобрения с листовой и корневой подкормками позволяет получить до 65 т/га плодов перца высокого качества.The action of mineral fertilizers, microcrystalline complex water soluble fertilizer Master and organic mineral nano-fertilizer with growth-stimulating activity Arksoil under drip irrigation on the productivity and quality of sweet pepper of the new hybrid F1 Temp is shown. The combination of basic fertilizer with leaf and root fertilizing allows to obtain up to 65 t/ha of pepper fruits of high quality.

A new potential of calcium carbonate production induced by Bacillus sphaericus in batch fermentation

2018 ◽  
Vol 10 (9) ◽  
Author(s):  
Nuraiffa Syazwi Adzami ◽  
◽  
Miskiah Fadzilah Ghazali ◽  
Amira Hidayati Ramli ◽  
Husnul Azan Tajarudin ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Batch Fermentation ◽  
Bacillus Sphaericus ◽  
Carbonate Production

Temperature Measurement of Single Levitated Microparticles Using Stokes/Anti-Stokes Raman Intensity Ratios

1994 ◽  
Vol 48 (12) ◽  
pp. 1498-1505 ◽  
Author(s):  
Scot D. Rassat ◽  
E. James Davis
Keyword(s):  
Temperature Measurement ◽  
Calcium Nitrate ◽  
Composition Analysis ◽  
Calcium Nitrate Tetrahydrate ◽  
Electrodynamic Balance ◽  
Beam Expander ◽  
Nitrate Tetrahydrate ◽  
Intensity Ratios ◽  
Anti Stokes ◽  
Heating Beam

A method has been developed to determine the temperature of single microparticles levitated in an electrodynamic balance. Particle temperatures were ascertained from the measured intensities of the Stokes and anti-Stokes Raman spectra. Temperatures near ambient were obtained for titanium dioxide and calcium nitrate microparticles with the use of a Raman-based calibration of the optical system to correct for wavelength-dependent effects. Higher temperatures were also measured with the use of a carbon dioxide infrared laser to electromagnetically heat the particle. In an effort to minimize particle instabilities caused by the heating beam, the Gaussian intensity profile of the beam was modified with an axicon beam expander to produce a doughnut-like intensity distribution. The temperature measurement technique and quantitative Raman composition analysis were applied to study dehydration of a calcium nitrate tetrahydrate particle.

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