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Hevi-Sand® Foundry Chromite Sand is used in foundries worldwide due to its unique combination of properties. Hevi-Sand® is produced from high-grade foundry chromite which has been specially treated for use as a mold and core media in the production of quality castings. …
Chromite sand has been applied continuously in foundries since the 1960s, as exemplified in Picture 4. The CastTherm 45 product is the conventional material used by steel foundries for mold and core production …
Zircon and chromite sand have low thermal expansion but good thermal conductivity which is responsible for their excellent chilling properties [16, pp. 920–921]. …
The values of thermal conductivity of the molds which consisted of silica, zircon, chromite sands decrease gradually from room temperature to 1,000°C. The mean values of thermal conductivity of these molds are 0.0015CGS unit for silica sand, 0.0018CGS unit for olivine sand, 0.0021CGS unit for zircon sand and 0.0018CGS unit for chromite sand.
2.1 Materials. The natural material tested in the present work is a carbonate (calcareous) granular material with origin from the South China Sea. The specific gravity of …
Crushed and sieved Chromite sand with the fineness of AFS30-35, AFS35-40, AFS40-45, AFS45-50, and AFS45-55 are specifications of molding sand. Chromium ore sand has excellent thermodynamic properties such as high refractory temperature, low specific heat, and high thermal conductivity.
thermal conductivity of these parts may be primarily explained by their dissimilar porosity since the chemical and phase compositions of the refractories are similar. ... The temperature relationship of the thermal conductivity of the magnesite--chromite refractory is close to linear (Fig. 5, curve 4), which is characteristic of this type of ...
where k~=effective thermal conductivity of the packed bed, ke=effective thermal conductivity by conduction only, and kr=effective thermal conductivity by radiation only. There are a number of models1, 6, 9, 11-22for the pre-diction of k e. Other models2, 3, 9, 23-30are available in which k r can be added to k e, as well as modelsl, 18-20
Numerical simulation of the foundry process, aimed at reducing costs and production lead times, directly impacts the responsiveness and competitiveness of the foundries that employ it. Three experiments were conducted to establish the values of specific heat capacity (Cp), density (ρ), and thermal conductivity (λ) of green sand over a measurement range …
46% Chromite sand is composed of chromium, iron, and oxygen (chemical formula FeCr2O4). It is an oxide mineral belonging to the spinel group. 46% content referring to Cr2O3 content more than 46%.
Chromite improves thermal shock and slag resistance, volume stability, and mechanical strength. A major advance in the technology of basic refractories occurred during the early 1930s, when important discoveries were made regarding combinations of chrome ore and dead burned magnesite.
Foundry grade Chromite grains are a kind of foundry sand with high refractoriness. The content of chromium oxide of casting chromite sand should be at least 46%. That will get high Solid-phase sintering temperature. Chrome ore sand is especially featured with its high thermal conductivity. It can not only make the casting steel cool quickly, but also prevent casting …
The merits of chromite foundry sands include high refractoriness, good chemical stability, low thermal expansion – which means the mould retains a stable size – and high density and thermal conductivity (which promote rapid solidification …
Dry Chromite sand is usually used for large, heavy, and structurally complex casting surface dry sand. Dry sand in casting needs to have high sand mold strength, fire resistance temperature, and resistance to molten steel erosion. Besides the sintering temperature and thermal conductivity, the moisture of chromite sand is an important technical index as well.
Chromite sand belongs to the category of special sand in modeling materials. Its main mineral composition is FeO.Cr2O3, density is 4.0～4.8g/cm3, Mohs hardness is 5.5～6, refractoriness is greater than 1900℃, chromite Sand has good resistance to alkaline slag and does not react chemically with iron oxide. ... Since the thermal conductivity ...
Its properties enable the material to be used in high duty grey iron and steel foundries as core and mould making sand. Its high thermal conductivity gives it good chilling properties, low thermal expansion gives rise to good dimensional stability. Its basicity being close to neutral allows the use of a wide range of resin bonding systems and ...
Chromite sands have been utilized to produce cores in foundries for many years. This investigation focuses on finer grades of chromite sand for core produced with shell technology. The specific shell cores produced result from the unique thermal characteristics of finer grades of chromite sand. The resulting castings demonstrate a high level of casting …
Chromite sand AFS 40-45 is a quick chilling material with high refractory temperature and excellent thermal conductivity. Therefore, in the casting of cast iron, it is necessary to prevent cold iron from being replenished outside the …
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 …
Chromite Sand in the foundry industry. Its properties enable the material to be used in high duty grey iron and steel foundries as core and mould making sand. Its high thermal conductivity gives it good chilling properties, low thermal expansion gives rise to good dimensional stability.
The thermal conductivity of chromite sand is several times greater than that of silica sand, and the chromite sand itself undergoes solid-phase sintering during molten metal pouring, which is beneficial to prevent the penetration of molten metal. In the foundry industry, chromite sand is mainly used as the mold, core surface sand and anti ...
Chromite ore is a type of spinel ore containing chromium oxide, iron oxide, and small amounts of silicon and calcium. After breaking into small particles, it becomes sandy and is also known as …
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 …
46% Chromite sand with high thermal conductivity works well to make the casting steel cool. Especially for large casting, chromite sand can make it solidify in a proper order. It is suitable for resin no-bake sand casting, sodium silicate binder casting, and shell molding casting. Chromite sand is produced from washed natural chromite ore. There are few sediment and silica …
Foundry Chromite Sand is special sand with excellent properties at high temperatures. Provides high resistance to the liquid metal penetration and produces more rapid cooling of the casting compared with other sands. Thermal expansion is much lower than silica sand, thus reducing the sand's expansion problems. The chromite sand is compatible with all chemical processes of …
The thermal conductivity of materials used in the production of sand moulds has been studied in several scientific centres and presented in many papers (Banaszak 2006;Binczyk et al. 2006;Ignaszak ...
Due to its better thermal conductivity, this type of sand is mainly used for casting materials with high casting temperatures. Performance characteristics of the plants. ... A strong- field magnet separates the chromite sand from the silica sand and the waste fraction. In a downstream stage, the separation process is supported by a fluidising ...
for the thermal conductivity of sand of the form. k ... Thermal conductivity, for instance, plays a crucial role in elucidating interactions like seepage and upwelling between groundwater and ...
Physical properties of Chromite Sand Melting point of 2150°C Good thermal conductivity Good resistance to thermal shock Excellent resistance to metal penetration or burn-on Resists slag attack High dimensional stability …
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 …
