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DOI: 10.1016/S1006-706X(12)60066-1 Corpus ID: 135517193; Effect of Chromite-Silica Sands Characteristics on Performance of Ladle Filler Sands for Continuous Casting @article{Farshidfar2012EffectOC, title={Effect of Chromite-Silica Sands Characteristics on Performance of Ladle Filler Sands for Continuous Casting}, author={Farshad Farshidfar and …
In order to ensure the use effect of sodium silicate chromite sand, in addition to the chromite raw sand that meets the specified technical conditions, the technical requirements that the used sodium silicate must meet are: modulus 2.20～2.40, …
As can be seen from the above XRF results, the seperated chromite sand contains less than 0.5% silica contamination and therefore is perfect for re-use at the mixer. As a general side effect from the casting process, the chromite sand tends to see most of the heat from the molten metal and so is also naturally thermally reclaimed.
The SiO 2 content of the sand should be about 20% to achieve optimal sintering effects. Chromite sand for casting is not suitable for the steels. The mixed sand presented in the current study demonstrates potential as a suitable filler sand for the steel (20 ≤ Mn mass% ≤ 30).
As can be seen from the above XRF results, the seperated chromite sand contains less than 0.5% silica contamination and therefore is perfect for re-use at the mixer. …
Air Pollution: Silica sand mining and processing can also lead to air pollution, particularly from the dust generated during the extraction and processing of the sand. This dust can contain silica particles, which can contaminate oxygen if inhaled, leading to respiratory problems and other health issues such as lung cancer. ...
Chromite sand is used in the metal casting industry due to its high thermal conductivity providing the chilling effect. Chromite has a low thermal expansion which helps eliminate expansion defects. Chromite sand has a glossy black appearance and has a greater resistance to metal penetration than zircon. It has a higher acid demand than other sands, which means you will …
The most important property of silica clay sand includes the shape of the sand particle and size distribution. Sieving process was used to obtain the uniform grain size of the soil sample. Moisture content has great effect on the silica clay sand at varying quantity of moisture found in the sand.
Contamination with high-silica sand, increasing SiO 2 content, ... Fig. 4. Effect of heating temperature on chromite grain surfaces of moulding sand: a) 1000 °C, b) 1100 °C,
However, silica sand is known to have a high thermal expansion of 1.6%, low refractoriness, and a low specific gravity of 2.65 [11]. Chromite sand is often used as an alternative to silica sand, especially when the moulds require a low thermal expansion of 0.6%, high refractoriness, and a high specific gravity of 4.66.
Silica sand due to its availability and low price is the most often used as matrix of molding and core sands. However, in the last time, the situation of silica sands was changed because the so-called crystalline silica was considered to be the carcinogenic factor (grains <5 μm, i.e., respirable dust) [].The most often the so-called terrestrial sands are used.
supply and demand for silica sand, now and into the future. Because demand for frac sand has been the main driver of growth for industrial sand production, Part 2 also briefly discusses the role of silica sand as a proppant for oil and natural gas recovery. Those raising fears of the effects of frac sand mining have taken advantage
In the present work the effects of temperature and holding time on the sintering of ladle filler sand are studied. Laboratory experiments are carried out using pellets made of chromite based ...
Foundry grade chromite sand is a complex compound of various elements; chromium (Cr 2 O 3), aluminium (Al 2 O 3), silica (SiO 2), and magnesium oxide (MgO). Chrome's resilient characteristics make it the material of choice for …
Foundry Chromite sand AFS40-45 is chromium-based casting sand. It works as molding sand for lost casting, V-method casting, no-back sand casting, etc. Chromite sand used for casting is clean and of few silica impurities. By water washing and magnetic removal process, we remove harmful silica minerals from the sand. Thus, chromite sand with low turbidity can …
Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands.
In this research paper, we introduce a novel and sustainable approach for forecasting the hydraulic conductivity of sand layers subjected to microbial-induced carbonate precipitation (MICP) to mitigate the diffusion of toxic pollutants. The proposed model uniquely integrates the impact of varying CaCO3 contents on the void ratio and estimates the average particle size of …
3. The linear expansion of chromite is small, which may cause sand inclusions in the castings, so it can be used to mix the green sand molds of large castings. 4. Chromite sand is sintered with fine particles to eliminate metal infiltration, accompanied by cooling and high residual thermal strength. 5. Chromite sand is universal and can be used ...
Effect of heating temperature on grain surfaces of chromite moulding sand: a) 700 °C, b) 800 °C, c) 950 °C, d) 1200 °C. Visible are linking bridges and residues of binder in surface layer Fig. 3.
Effect of heating temperature on grain surfaces of chromite moulding sand: a) 700 °C, b) 800 °C, c) 950 °C, d) 1200 °C. Visible are linking bridges and residues of binder in surface layer.
There was another distinct correlation that showed a decrease in overall thermal stability when contaminated chromite sand was heated to elevated temperatures, which …
Chromite sand belongs to the category of special sand in modeling materials. Its main mineral composition is FeO·Cr203, density is 4.0~4.8g/cm3, Mohs hardness is 5.5~6, refractoriness is greater than 1900℃, chromite sand It has a good anti-alkaline slag effect and does not react chemically with iron oxide. Because the thermal conductivity of chromite sand …
The moulding material selected for this study is South African chromite sand that is gaining popularity both domestically and abroad as a moulding material. Chromite sand offers greater adaptability than silica sand when it comes to the casting of high temperature alloys as it is more stable at higher temperatures6.
There was another distinct correlation that showed a decrease in overall thermal stability when contaminated chromite sand was heated to elevated temperatures, which resembled data presented by prior research. 2 Understanding the importance of elemental silica in the base chromite sand ore is critical, the analysis of the specific South African ...
In case of high Mn-high Al steel grades, the effect of Mn on the sintering is more remarkable than that of Al, and the mixed filler sands are seriously sintered. Zircon sand grains are not suitable for high Mn-high Al steel grades.
Previous studies [22,23] imply that the effect of pressed pellets on the sintering of ladle filler sands can be neglected. In this study, some pressed sand pellets were used as well. When preparation, 8 g of sand grains and a few drops of organic binder solution (5 pct PVA) were well mixed and then pressed in a mold (ID 20 mm) under a pressure of 20 MPa.
This demonstrates that the main mechanism for sintering of well filler sand based on South African raw materials is the reaction between the silica and chromite sand grains, and that the silica and chromite phases react to form a liquid phase responsible for sintering. Effect of the silica content on the extent of sintering
Typical Chromite Sand Testing • South African Chromite Sand is the world standard for metalcasting and foundry applications, however there can ... • Tensile strength of various sands (chromite, silica, olivine etc.) can be measured by mixing with a foundry resin system and preparing 1 inch thick (2.54 cm) tensile specimens or
Particle size of ladle sand is important, firstly due 270 240 h 210 ' 180 5 160 sv 120 590 60 30 0 410 20 30 40 50 60 70 28/(") C-Chromite sand! S-Silica sand. Fig. 4 XRD pattern of four different particle sizes of KR1 ladle filler sand to porosity and penetration of liquid metal into filler sand, and secondly because of flowability of sands.
The reaction between the silica phase and the chromite phase is found to be the main mechanism for the sintering of sand. The reaction results in a liquid oxide phase, which …
