scholarly journals Latvijas minerālās izejvielas eko-keramikas izstrādei

2018 ◽  
Vol 35 ◽  
pp. 62-85
Author(s):  
Gaida Sedmale ◽  
Māris Rundāns ◽  
Mārtiņs Randers ◽  
Ingunda Šperberga ◽  
Andris Cimmers
Keyword(s):  
High Temperature ◽  
Ceramic Material ◽  
Gas Phase ◽  
Phase Formation ◽  
Raw Materials ◽  
Ceramic Materials ◽  
Firing Process ◽  
Mineral Raw Materials ◽  
Technological Processes ◽  
Insight Into

Darbā dots ieskats par iespējām izmantot Latvijas minerālās izejvielas kā bāzi vai  piedevu  keramikas  materiālu  (eko-materiālu)  izstrādei ar dažādu pielietošanas aspektu, to skaitā parādīt iespēju šo materiālu ieguves tehnoloģisko procesu optimizēšanai virzībā uz to apdedzināšanas temperatūras samazināšanu, līdz ar to reducējot kaitīgu gāzveida izmešu nonākšanu vidē. Parādīti darbu rezultāti laika periodā no 2007. g. līdz 2017. g. Tiek apskatīti un analizēti sekojoši pētījumi:neapstrādāta māla pielietošana atkritumu deponēšanas vietu noblīvēšanai;daļēji dehidratizēta māla pielietošana Cr3+, Cr6+, Zn2+ un Cu+ jonu sorbcijai, kas veidojas galvanisko procesu notekūdeņos; poru saturošas augsttemperatūras keramikas izstrāde no jauktiem izejvielu maisījumiem, kas nodrošina pietiekamu gāzveida fāzes izveidošanos keramikas apdedzināšanas procesā, veidojot poras, lai pielietotu par filtrēšanas/attīrīšanas materiālu;illīta māla piedevu izmantošana, lai pazeminātu augsttemperatūras blīvas keramikas saķepināšanas/apdedzināšanas temperatūru, iegūstot ilgspējīgu mehāniski un termiski izturīgu produktu; kā arī tehnoloģiskie procesi, kas nodrošina porainas, siltumu izolējošas keramikas materiāla ieguvi pie pazeminātām temperatūrām (ģeopolimēru metode).Mineral Raw Materials of Latvia for Development of Eco-CeramicsThe paper gives an insight into the possibilities to use Latvian mineral raw materials as a base or additives for the development of ceramic materials (eco- materials) with different application aspects, including showing the possibility of optimizing the technological processes of these materials towards the reduction of their firing temperature, thereby reducing the release of harmful gaseous effluents into the environment.The results of the works that are reported in the period were obtained from  2007 to 2017. The following studies are reviewed and analyzed: the use of untreated clay for the sealing of waste deposits; the use of partly dehydrated clay for sorption of Cr3+,6+, Zn2+ and Cu2+, which have formed in galvanic processes; the development of porous high temperature ceramics from mixes  of mineral raw materials and synthetic additives that provide a sufficient gas phase  formation in the firing process and consecutively to form pores in obtained ceramic material; the use of illite clay additives to reduce the temperature of sintering of high temperature dense mechanical and thermally durable ceramics, as well as technological processes that ensure the production of porous, heat-insulating ceramic materials at reduced temperatures (geopolymer method).

The Use of Combustion Reactions for Processing Mineral Raw Materials: Metallothermy and Self-propagating High-temperature Synthesis (Review)

2015 ◽  
Vol 47 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Farit Kh. Urakaev ◽  
Kenzhebek A. Akmalaev ◽  
Eljan S. Orynbekov ◽  
Beykut D. Balgysheva ◽  
Dinar N. Zharlykasimova
Keyword(s):  
High Temperature ◽  
Raw Materials ◽  
Temperature Synthesis ◽  
Mineral Raw Materials ◽  
High Temperature Synthesis

scholarly journals Gas phase formation of phenalene via 10π-aromatic, resonantly stabilized free radical intermediates

2020 ◽  
Vol 22 (27) ◽  
pp. 15381-15388
Author(s):  
Long Zhao ◽  
Ralf I. Kaiser ◽  
Wenchao Lu ◽  
Musahid Ahmed ◽  
Artem D. Oleinikov ◽  
...  
Keyword(s):  
High Temperature ◽  
Free Radical ◽  
Gas Phase ◽  
Phase Formation ◽  
Radical Intermediates ◽  
Temperature Conditions ◽  
Combustion Systems ◽  
Circumstellar Environments

1H-Phenalene can be synthesized via the reaction of the 1-naphthyl radical with methylacetylene and allene under high temperature conditions prevalent in carbon-rich circumstellar environments and combustion systems.

scholarly journals Infrared spectroscopy as the method for evaluating technological properties of minerals and their behavior in technological processes

2020 ◽  
Vol 166 ◽  
pp. 02002
Author(s):  
Ihor Kholoshyn ◽  
Natalia Panteleeva ◽  
Oleksandr Trunin ◽  
Liudmyla Burman ◽  
Olga Kalinichenko
Keyword(s):  
Infrared Spectroscopy ◽  
Raw Materials ◽  
Structure And Properties ◽  
Technological Properties ◽  
Mineral Raw Materials ◽  
Operational Analysis ◽  
Technological Processes ◽  
Innovative Solutions ◽  
Technological Processing

Infrared spectroscopy (IR) is a highly effective method for the analysis of minerals, rocks and ores, capable of solving a whole range of problems when choosing innovative solutions for the technological processing of various types of mineral raw materials. The article considers the main directions of using the infrared spectroscopy method in assessing the technological properties of minerals and their behavior in technological processes: evaluation of the grade (quality) of mineral raw materials; analysis of the behavior of minerals in the technological process with prediction of their technological properties; analysis of changes in the structure and properties of minerals in technological processes; operational analysis of mineral substances at various stages of technological processing. The article illustrates all aspects of the use of infrared spectroscopy at various stages of studying the material composition of mineral raw materials in its enrichment assessment by specific examples of solving problems arising from the technological redistribution of various types of ore and non-metallic minerals.

Formation Mechanism of AlZrO and ZrAlON Phases in Al-ZrO2-N2 Systems

2010 ◽  
Vol 150-151 ◽  
pp. 1234-1238
Author(s):  
Rong Lin Wang ◽  
Jia Lin Sun ◽  
Jing Long Bu ◽  
Zhi Fa Wang
Keyword(s):  
Mass Transfer ◽  
High Temperature ◽  
Gas Phase ◽  
Formation Mechanism ◽  
Raw Materials ◽  
Contact Reaction ◽  
Intermediate Phases ◽  
N2 Atmosphere ◽  
Temperature Dynamics

Al-ZrO2 composites were sintered in N2 atmosphere at 1000 oC, 1100 oC, 1200 oC and 1300 oC with ZrO2 and Al powders as raw materials. Formation mechanism of AlZrO and ZrAlON phases in Al-ZrO2-N2 systems were investigated by TG-DTA, XRD, SEM and EDS analyses. Results showed there existed new phases of ZrAl3O3N and AlxZr1-xO2-0.5x beside ZrO, ZrN, Al2O3, AlN and intermediate phases of Al7O3N5, Al8O3N6, ZrON, ZrON2, Zr7O8N4 in samples sintered at 1000 oC to 1300 oC. There existed process of mass transfer of ZrO2 in gas phase in samples at high temperature. Dynamics processes of ZrAl3O3N and AlxZr1-xO2-0.5x phases formed in N2 atmosphere at high temperature included contact reaction and ZrAlON sosoloid crystallization.

Influence of Coated Composite Powders on the Properties of ZrB2-YAG-Al2O3 Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 451-456
Author(s):  
Jie Guang Song ◽  
Xiu Qin Wang ◽  
Fang Wang ◽  
Shi Bin Li ◽  
Gang Chang Ji
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Composite Powder ◽  
Raw Materials ◽  
Protective Layer ◽  
Ceramic Materials ◽  
Composite Powders ◽  
Plasma Sintering ◽  
Spark Plasma

ZrB2, YAG and Al2O3 are widely applied because of some excellent performances, but ZrB2 is easily oxidized in the high-temperature air. To make the ZrB2 ceramics obtain better oxidation resistance, high-density ZrB2-YAG-Al2O3 ceramics were prepared. The influences of coated composite powders on the densification and the oxidation resistance of ZrB2-YAG-Al2O3 ceramics were investigated. The 80wt%ZrB2-YAG-Al2O3 multiphase ceramic materials from different composite raw materials with the spark plasma sintering technique were successfully prepared. The densification of ZrB2-YAG-Al2O3 ceramics with Al2O3-Y2O3 composite powder coated is easier than that of ZrB2-YAG-Al2O3 ceramics with YAG-Al2O3 powder mixed. The reaction temperature is lower than the 1100¡æ for synthesizing YAG powders from Al2O3-Y2O3 composite powders. The weight gain are increased with increased the oxidation temperature. B2O3 is reacted with Al2O3 to form Al18B4O33, Al18B4O33 is melted and coated on the surface of ceramics to form a protective layer for the oxidation resistance of ceramics at high temperature. The oxidation weight gain of ZrB2-YAG-Al2O3 ceramic with Al2O3-Y2O3 composite powder coated is lower than that of ZrB2-YAG-Al2O3 ceramic with YAG-Al2O3 powder mixed.

scholarly journals Effect of High Temperature on Mechanical Properties of Geopolymer Mortar

2018 ◽  
Vol 163 ◽  
pp. 06004 ◽  
Author(s):  
Mateusz Sitarz ◽  
Izabela Hager ◽  
Joanna Kochanek
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Fly Ash ◽  
Cement Mortar ◽  
Raw Materials ◽  
Thermal Exposure ◽  
Amorphous Structure ◽  
Secondary Mineral ◽  
Mineral Raw Materials ◽  
Interesting Alternative

The advent of modern aluminosilicate binders has resulted in practical uses for fly ash, which belongs to the group of secondary mineral raw materials; this provides an interesting alternative to cementitious binders, which have a large carbon footprint. Geopolymers mineral binders with a growing range of applications in construction. Their inorganic, amorphous structure endows them with better resistance to high temperature compared to cementitious binders. In this study, the alkaline activation of aluminosilicate Połaniec Fly Ash made it possible to obtain noncementitious material with compressive strength of 18.5 MPa. The article presents the results of a comparison of characteristics of geopolymer mortar and Portland cement mortar after thermal exposure.

Thick films of ceramic superconducting, electro-ceramic materials

2002 ◽  
Vol 74 (11) ◽  
pp. 2083-2096 ◽  
Author(s):  
H. Altenburg ◽  
J. Plewa ◽  
G. Plesch ◽  
O. Shpotyuk
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Ceramic Material ◽  
Thick Film ◽  
Screen Printing ◽  
Thick Films ◽  
Ceramic Materials ◽  
Superconducting Materials ◽  
Processing Sequence ◽  
Oxide Powders

The use of thick films becomes more and more important in particular for electronic and microelectronic applications. The term “thick film ” does not relate so much to the thickness of the film but more to the kind of deposition. Thick films are made by low-priced processes such as doctor (dr) blading, screen-printing, or spraying methods, etc. The preparation of thick films of ceramic material by these methods generally implies a processing sequence of the following steps: preparation of the oxide powders; preparation of pastes and slurries; painting/printing, etc.of the pastes onto a suitable substrate; drying at low temperature; and sintering at high temperature to get a consolidated layer. These technologies and the fabricated thick films of thermoresistive and superconducting materials will be discussed.

Development of an Innovative Carbon-Based Ceramic Material Application in High Temperature, Neutron and Hydrogen Environment

2005 ◽  
Vol 475-479 ◽  
pp. 1497-1502
Author(s):  
C.H. Wu
Keyword(s):  
High Temperature ◽  
Ceramic Material ◽  
Safety Concern ◽  
Life Time ◽  
Ceramic Materials ◽  
Great Effort ◽  
Hydrogen Environment ◽  
Lower Reactivity ◽  
Very High ◽  
Carbon Based

In the framework of the European Fusion Research Program, a great effort has been made to develop an innovative carbon-based ceramic material to meet all of all operational requirements. After a decade of research and development, It is succeeded to develop an advanced material: namely, a 3D CFC, contains about 8-10 at% of Silicon with porosity is about 3-5% . This advanced ceramic material possess very high thermal conductivity, dimensional stability under the neutron irradiation, lower chemical erosion (longer life time), lower tritium retention and lower reactivity with water and oxygen (safety concern) . This innovative ceramic materials seems very promising for application in the high temperature, neutron and hydrogen environment. A detailed discussion on development , properties and application of material is presented.

Insight into High Temperature Gas-Phase Arsenic Capture by a CaO–Ca12Al14O33 Synthetic Sorbent

2021 ◽  
Vol 35 (3) ◽  
pp. 2425-2433
Author(s):  
Zhongli He ◽  
Bing Song ◽  
Cai Liang ◽  
Bin Liu ◽  
Zhirui Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Phase ◽  
Insight Into ◽  
High Temperature Gas
Sign in / Sign up

Export Citation Format

Share Document