Fused-cast chrome-containing refractories and prospects for their industrial production

2021 ◽  
pp. 88-93
Author(s):  
V. A. Sokolov ◽  
M. D. Gasparyan
Keyword(s):  
Corrosion Resistance ◽  
Hexavalent Chromium ◽  
Chromium Oxide ◽  
Borosilicate Glass ◽  
Industrial Production ◽  
Basalt Fiber ◽  
Mineral Wool ◽  
Safe Production ◽  
Production Conditions

Information is given on various types of fused-cast chrome-containing refractories ― chromalumozircon and chromium spinelids. It is shown that the chromium spinelids refractories HPL-85 and HMG are at the same level with the ceramic refractories made of chromium oxide in terms of corrosion resistance in melts of alkali- free borosilicate glass E, mineral  wool,  basalt  fiber, etc. The problems of the presence and formation of hexavalent chromium in the production of chrome- containing materials are discussed. It is shown that the production of fused-cast chrome-containing refractories is possible under safe production conditions. The necessity of creating an industrial production of fused chromium-containing refractories based on domestic developments, taking into account the best foreign achievements, is noted.

Industrial Application of Pb–Ag–Ca Anode with Surface Passivation for Zinc Electrowinning

2014 ◽  
Vol 941-944 ◽  
pp. 1398-1401
Author(s):  
Jian Huang ◽  
Yuan Fa Ding ◽  
Xiang Dong Su ◽  
Yong Li ◽  
Yong Sheng Xiong ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Industrial Application ◽  
Industrial Production ◽  
Surface Passivation ◽  
Production Costs ◽  
Zinc Electrowinning ◽  
Alloy Anode ◽  
Detection And Tracking

The Pb–Ag–Ca alloy anode with surface passivation was applied in industrial production of zinc electrowinning. The application situation was investigated by detection and tracking more than 3 months. The results were analyzed by comparison with the data acquired from the production using the reference anodes without surface treatment. The results showed that using the anode with surface passivation can increase zinc yield, reduce Pb content in zinc product, prolong the anode life by improving the corrosion resistance, and then reduce the production costs.

Reactive Sputter Deposition of WCx Films for Replacing Hexavalent Chromium

2005 ◽  
Vol 486-487 ◽  
pp. 514-517
Author(s):  
Yeon Kyu Park ◽  
Seung Mo Kang ◽  
Daekyu Kim ◽  
Chong Mu Lee
Keyword(s):  
Corrosion Resistance ◽  
Hexavalent Chromium ◽  
Human Body ◽  
Sputter Deposition ◽  
Complex Geometries ◽  
Optimal Conditions ◽  
Rf Power ◽  
Reactive Sputter Deposition ◽  
Chromium Electroplating ◽  
Ch4 Concentration

This paper investigates the reactive sputter deposition of tungsten carbide (WCx) films for replacing hexavalent chromium which was found to cause cancer in human body. The deposition rate of the films was proportional to rf-power and inversely proportional to the CH4 content in the sputtering gas. The hardness of the WCx coatings increased as the rf-power increased. The highest hardness was obtained at the CH4 concentration of 10 vol.% in the sputtering gas. The hardness of the WCx film deposited under optimal conditions was far higher than that of the electroplated chromium film although the corrosion-resistance of the former was slightly inferior to that of the latter. Considering all these experimental results, it may be concluded that the reactive sputterdeposition of WCx coatings can be effectively applied to the parts with complex geometries as an alternative to chromium electroplating.

scholarly journals MINERAL WOOL COMPOSITE WITH THE USE OF SAPONITE-CONTAINING MINING INDUSTRY WASTE

2020 ◽  
Vol 3 (3) ◽  
pp. 21-27 ◽  
Author(s):  
T. Drozdyuk ◽  
Arkadiy Ayzenshtadt ◽  
M. Frolova ◽  
Rama Shanker Rama Shanker Verma
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Mining Industry ◽  
Basalt Fiber ◽  
Linear Increase ◽  
Mineral Wool ◽  
Basalt Fibers ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity

the paper shows the possibility of producing a thermal insulating composite based on basalt fibers and sapo-nite-containing mining waste. A method for manufacturing thermal insulating composites from hydro-mass with different contents of the mixture components is proposed. Basalt fibers were used as a filler, and pre-mechanoactivated saponite-containing material (SCM) was used as a binder. It was found experimentally that depending on the composition of composites, the coefficient of thermal conductivity varies from 0.1109 to 0.1342 W/(m•K), and the compressive strength – from 0.45 to 0.93 MPa. In addition, it was found that thermal modification of composites at temperatures up to 1200°C significantly (up to 3 times) increases the compressive strength of composites, while not affecting the coefficient of thermal conductivity. The ex-periments to determine the conductivity of the composite “basalt fiber – SСM” depending on its moisture content showed that the obtained composite is characterized by intense and linear increase in the values of conductivity when the humidity of the sample to 12% and further increase in humidity practically does not change the values of the coefficient of thermal conductivity. Comparison of the studied thermal insulation composite with known structural thermal insulation materials in terms of its thermal insulation and strength characteristics showed that it is comparable to gas and foam blocks. It should also be noted that this material is environmentally safe and can withstand high temperatures without collapsing.

scholarly journals Influence of the Type of Aggregate from Industrial Waste on Corrosion Resistance of Modified Fine-Grained Concrete

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 352
Author(s):  
Ljajsjan Zajceva ◽  
Ekaterina Lucyk ◽  
Tat’jana Latypova ◽  
Valerij Latypov ◽  
Pavel Fedorov ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Industrial Waste ◽  
Raw Materials ◽  
Mineral Wool ◽  
Concrete Mixture ◽  
Green Technologies ◽  
Widespread Application ◽  
Waste Products ◽  
Natural Resource Conservation ◽  
Use Of Resources

The development and implementation of “green” technologies in the construction sector, which ensure natural resource conservation, reduce harmful emissions and provide utilization of industrial waste, are key issues in material engineering of the XXI century. Extensive research has been devoted to solving these issues, including research in the field of concrete science. Still, the issue of developing concrete compositions with increased corrosion resistance remains much less studied. At the same time, reactive aggregates from industrial waste can have positive effect on durability of concrete, and the best result can be achieved by means of modification of a concrete mixture with highly effective additives. The article presents the research data in two lines—the study of applicability of reactive aggregates from waste products of nonmetallic and ceramic industries, mineral wool production and concrete scrap for production of corrosion-resistant concretes, as well as the assessment of possibility of Portland cement quantity reduction in a concrete mixture on local raw materials due to the introduction of additives based on polycarboxylates. The article presents the research evidence of the effect of dust and clay particles content on the quality of concrete with a polycarboxylate additive. The article describes the studies of corrosion resistance of concrete samples based on production wastes in sulfate environments and under the influence of carbon dioxide. The developed concrete compositions with waste use can be recommended for widespread application, rational use of resources, and production of durable high-quality concretes. The application of additives based on polycarboxylates makes it possible to produce concretes with the reduction of cement consumption in the mixture by 10–20% and decrease in the mode of thermo-wet treatment by two times.

Corrosion resistance without hexavalent chromium—new zinc plating systems

2002 ◽  
Vol 100 (5) ◽  
pp. 33-36 ◽  
Author(s):  
John Hadley ◽  
Wim Verberne ◽  
Linda Wing ◽  
Jim O'Grady
Keyword(s):  
Corrosion Resistance ◽  
Hexavalent Chromium ◽  
Zinc Plating

Preparation and corrosion resistance of short basalt fiber/7075 aluminum composite

2020 ◽  
Vol 71 (11) ◽  
pp. 1824-1831
Author(s):  
Yinlong Ma ◽  
Hongwei Xiong ◽  
Baoyi Chen
Keyword(s):  
Corrosion Resistance ◽  
Basalt Fiber ◽  
Aluminum Composite

Enthalpies of Chromium Oxide Solution in Soda Lime Borosilicate Glass Systems

2001 ◽  
Vol 84 (12) ◽  
pp. 2987-2990 ◽  
Author(s):  
Cheon-Woo Kim ◽  
Kwansik Choi ◽  
Jong-Kil Park ◽  
Sang-Woon Shin ◽  
Myung-Jae Song
Keyword(s):  
Chromium Oxide ◽  
Borosilicate Glass ◽  
Soda Lime

Corrosion resistance of mullite-corundum refractories to mineral wool melts

Refractories ◽  
1992 ◽  
Vol 33 (11-12) ◽  
pp. 475-480
Author(s):  
Yu. I. Goncharov ◽  
L. A. Tersenova ◽  
Yu. T. Al'kov
Keyword(s):  
Corrosion Resistance ◽  
Mineral Wool
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