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effect of strength of the acid demand of chromite sand

effect of strength of the acid demand of chromite sand

Sand Testing American Foundry Society

2021-7-9  Acid Demand Value (ADV) of Sand. In this module, the AFS 1114-00-S: Acid Demand Value (ADV) of Sand test will be demonstrated. Module topics will include: purpose of the ADV test, basic variables that factor into the test, and performing the test in a virtual environment. By the end of this module, you will be capable of measuring the Acid Demand Value of sand. (0.1 CEU)

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Chromite - an overview ScienceDirect Topics

The only valuable property is an extremely high resistance to attack by either acid or basic slag. Chromite brick is the “most neutral” refractory and its limited uses all exploit this unique feature. The most important application is as a single neutral course between the basic walls and acid roof of

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Understanding ADV and pH Testing for Mold, Core

2017-2-1  Very pure silica sand with no impurities will have an ADV number of 0.0. However, if the sand contains impurities that can react with the hydrochloric acid, the ADV number will increase. So, the more impurities in the sand that react with the hydrochloric acid and neutralize it, the higher will be the ADV

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Reclamation of Green Sand Containing Hot-Box Resin

The results show that the acid demand value of the reclaimed sand is higher than that of the base sand. Compared with the base sand, the grain size of the reclaimed sand is almost no difference. It can also be observed that the tensile strength of the molding sand is influenced by the acid demand value and clay content, but the reclaimed sand can still meet the casting process needs.

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Research on Performance of Foundry Sand under the

It discoveries the raw sand with different origin will have different properties even though they have the same particle size. The properties of their molding sand are also obviously different. For the raw sand that in the same particle size with similar acid demand value and four-screen distribution, the better grain shape will earn them a higher molding sand strength even though they have higher clay content.

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(PDF) SILICA SAND: FOUNDRY REQUIREMENTS AND

The importance of the Acid Demand in testing should not be overlooked as it reveals various carbonates and salts that may be missed with a standard pH test. A high ADV will significantly shorten bench life in the cold box system and lead to pinhole defects in castings due to the production of CO2 gas evolution.

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Effect of activator concentration on the strength, ITZ

2016-8-15  While comparing Mix 1 and Mix 2, it was observed that Mix 2 had its compressive strength comparable to the target strength of 35 MPa whereas Mix 1 had substantially less strength (30.26 MPa) than the targeted strength at 28 days. It is believed that paste content in the Mix 1 appeared to be less for bonding of aggregates and also had inadequate activator-binder ratio (0.35) which affected its workability and consequently, the strength

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Effect of Lime on Mechanical and Durability Properties

2016-5-27  After 28 days the strength loss and weight loss of concrete cubes caused due to attack of acid and sulphate are compared with that of water cured concrete cubes. Acid Resistance Strength Loss. Strength loss of cubes with various percentage lime content for both PSC and PCC immersed in 1 % sulphuric acid solution are reported in Fig. 13. On inclusion of lime up to 10 % in concrete made of PSC and 7 % in concrete made of PPC, the acid resistance in terms of strength

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Process for preparing sand cores and molds -

The improvement is particularly useful with alkaline sands, especially with olivine sand. The amount of acid used varies somewhat with the Acid Demand Value (the determination of which is within the skill of the artisan) of the foundry aggregate but in general it will be in the range of from about 0.05 to 5.0% based on the weight of the aggregate, usually 0.25 to 1.0%.

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Comparative study of the effect of Er:YAG and

2018-7-6  This study investigated the effect of Er:YAG (smart 2940 Dplus, DEKA, Italy) and Er:CrYSGG (Waterlase iPlus, Biolase, USA) lasers on the shear bond strength (SBS) between the orthodontic brackets and dental porcelain in comparison with conventional acid etching with 9% hydrofluoric acid (HF, Ultradent, USA). A total of 60 specimens of maxillary ...

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The effect of pH and the solids composition on the ...

Over the past years, an increasing demand to build with mud has emerged. This poses a challenge, as the engineering properties of mud are less favourable than sand (van 't Hoff and Nooy van der Kolff, 2012). One of the main applications of mud over the past years was to use dredged mud as a hydraulic fill material in land reclamations.

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Reclamation of Green Sand Containing Hot-Box

The green sand containing hot-box resin sand was reclaimed by the process of calcination followed by mechanical reclamation. The reclaimed sands were reused in the hot-box process. The grain size distribution, the shape factor, the clay content and the acid demand value were determined. The results show that the acid demand value of the reclaimed sand is higher than that of the base sand.

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Research on Performance of Foundry Sand under

This paper makes an experiental research on the performance of foundry sand under the effect of chemical binder. It discoveries the raw sand with different origin will have different properties even though they have the same particle size. The properties of their molding sand are also obviously different. For the raw sand that in the same particle size with similar acid demand value and four ...

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Industrial foundry sands and binders LKAB

MinSand. MinSand is a synthetic sand produced from Alumina. Because of its almost perfectly spherical particle shape, MinSand is widely used in the foundry industry as a mould and core sand. In core production, binder savings can be achieved when compared to other sands. This is attained without any loss in the core’s strength.

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Strength and size of phosphorus-rich patches

2020-12-7  Under natural conditions, soil nutrients are heterogeneously distributed, and plants have developed adaptation strategies to efficiently forage patchily distributed nutrient. Most previous studies examined either patch strength or patch size separately and focused mainly on root morphological plasticity (increased root proliferation in nutrient-rich patch), thus the effects of both patch ...

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EFFECT OF NANOMATERIALS IN CEMENT MORTAR

2016-8-26  Al-Rifaie et al. [22] examined the compressive and flexural strength of nano cement mortar by using micro cement, micro sand, nano silica, and nano clay in developing a nano cement mortar which can lead to improvements in ferrocement construction. In addition, the influence of heating on compressive strength of

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AN EXPERIMENTAL LABORATORY STUDY ON

2019-4-21  Compressive strength and split tensile strength tests were carried for 7, 14 and 28 days cured samples. The results indicated 33.7% decrease in strength values for 15 percent replacement in coarse aggregates by e-waste and 16.86% decrease when coarse aggregates are replaced by 20 % e-waste plus fly ash (10%). The

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SS Print India ora cec a eclogy, Comparative Study on the ...

Keywords: Acid Attack,Compressive Strength, Flexural Strength, Manufactured Sand, Rapid Chloride Permeability, Sulphate Attack, Split Tensile Strength Comparative Study on the Strength and Durability

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Effect of surface treatments on the bond strength of

Cojet is an in-office silica coating system that uses 30-µm silica-modified Al 2 O 3 particles (Cojet-Sand) blasted to the surface, followed by the application of a silane agent (ESPE-Sil). 9,12 These silica coating systems have showed adequate bond strength values in several studies. 1,8,9,12,14-18 Kern, Thompson 16 (1994) analyzed the ...

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Determining the Essential Qualities of Sand: 6 Tests ...

2 天前  Table 3.4 gives the compressive strength of the sand to be used for different casting materials. 4. Moisture Content Test: Moisture content may be determined by the loss of weight, after evaporation. A sample of tempered sand weighing 50 gm. is dried at 110 to 115°C, and then cooled to room temperature in desiccator and re- weighed. The ...

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Research on Performance of Foundry Sand under the

This paper makes an experiental research on the performance of foundry sand under the effect of chemical binder. It discoveries the raw sand with different origin will have different properties even though they have the same particle size. The properties of their molding sand are also obviously different. For the raw sand that in the same particle size with similar acid demand value and four ...

Get Price

Industrial foundry sands and binders LKAB Minerals®

MinSand. MinSand is a synthetic sand produced from Alumina. Because of its almost perfectly spherical particle shape, MinSand is widely used in the foundry industry as a mould and core sand. In core production, binder savings can be achieved when compared to other sands. This is attained without any loss in the core’s strength.

Get Price

Dissertations and Theses @ UNI Student Work

2021-3-22  acid demand value, pH, grain fineness number and screen distribution, loss on ignition, differential scanning calorimeter/thermo gravimetric analyzer (DSC/TGA), chemical analysis by x-ray florescence, and the casting trial.

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The Fundamentals of Chlorine Chemistry and Disinfection

2011-11-18  5 Effect of Cl 2 on E.coli zRecent study on effect of chlorine on E. coli zTested 6 strains of O157:H7 at 4 Cl 2 levels 10.25 mg/L 10.5 mg/L 11.0 mg/L 12.0 mg/L X 0 0.5 1 and 2 mins contact time z5/6 isolates + E. coli control strain were highly susceptible to chlorine z>7 log10 reduction of each of these strains by 0.25 mg/L free chlorine within 1 min (CT value = 0.25)

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EFFECT OF NANOMATERIALS IN CEMENT MORTAR

2016-8-26  Al-Rifaie et al. [22] examined the compressive and flexural strength of nano cement mortar by using micro cement, micro sand, nano silica, and nano clay in developing a nano cement mortar which can lead to improvements in ferrocement construction. In addition, the influence of heating on compressive strength of

Get Price

Influence of Local Sand on the Physicomechanical ...

2016-12-1  This research consists of incorporating the crushed sand (CS) in the composition of a concrete and studies the effect of its gradual replacement by the sand dune (SD) on sustainability of high performance concrete (HPC) in aggressive environments. The experimental study shows that the parameters of workability of HPC are improved when the CS is partially replaced by the SD (#x3c;2/3).

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Effects of Super Plasticizing and Retarding Admixtures on ...

effect of dosage of retarder and SP on properties of concrete. Since in some cases at job site, it is found that the concrete is left unset for 2 to 3 days due to over dosage of retarding

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Effect of surface treatments on the bond strength of a ...

Cojet is an in-office silica coating system that uses 30-µm silica-modified Al 2 O 3 particles (Cojet-Sand) blasted to the surface, followed by the application of a silane agent (ESPE-Sil). 9,12 These silica coating systems have showed adequate bond strength values in several studies. 1,8,9,12,14-18 Kern, Thompson 16 (1994) analyzed the ...

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Strength Characteristics and the Reaction Mechanism

Stone powder cement (SPC) is widely used as a novel cement substitute material in concrete for its good gelling performance and low cost. In order to reduce the backfilling cost and assess the potential of SPC backfilling materials, a series of experiments were conducted to analyze the strength and hydration reaction mechanism of stone powder cement tailings backfill (SPCTB).

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Alleviated Effect of Salinity Stress by Exogenous ...

2017-2-19  Alleviated Effect of Salinity Stress by Exogenous Application of Ascorbic Acid on the Antioxidant Catalase Enzymes ijlsci Int. J. of Life Sciences, Vol. 4(4) December, 2016 469 The objective of this study aimed to explain the role of

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The Fundamentals of Chlorine Chemistry and Disinfection

2011-11-18  5 Effect of Cl 2 on E.coli zRecent study on effect of chlorine on E. coli zTested 6 strains of O157:H7 at 4 Cl 2 levels 10.25 mg/L 10.5 mg/L 11.0 mg/L 12.0 mg/L X 0 0.5 1 and 2 mins contact time z5/6 isolates + E. coli control strain were highly susceptible to chlorine z>7 log10 reduction of each of these strains by 0.25 mg/L free chlorine within 1 min (CT value = 0.25)

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Effect of binder composition on the shrinkage of ...

2016-11-12  With increasing demand for near-net parts, there is a need to understand and improve the dimensional accuracy of sand cast parts (Thiel, 2011). The type of binder system used for sand molding affects dimensional stability. The binders provide the required strength and refractoriness during molten metal filling in mold cavity. At

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Effects of mechanical disturbance and salinity stress

One-hundred µl of 98% sulfuric acid (H 2 SO 4) was added to the dry sample, mixed and heated at 100°C for 10 min. The sample was cooled down to room temperature, mixed with 2.4 ml of vanillin reagent (600 mg vanillin in 100 ml of hot water and 400 ml of 85% phosphoric acid) and incubated for 5 min.

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EFFECT OF SODIUM SILICATE TO SODIUM HYDROXIDE

2017-10-25  sulphuric acid. The specimen with higher alkali content performed much better, than those with a lower alkali content in terms of residual compressive strength. There are limited researches on the effect of sodium silicate to sodium hydroxide (Na 2 SiO 3 /NaOH) ratio on durability properties of geopolymer mortar especially for

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Highly Efficient Proliferation and Regeneration of ...

2018-7-30  the effect of medium strength, sucrose, nitrogen (NH 4 NO 3) and potato extract on proliferation of P. bellina protocorm-like bodies (PLBs) to improve micropropagation in this species. Optimal treatment for PLBs proliferation rate with an average fresh weight (FW) of 0.97±0.16 g was obtained through culturing on half strength (½) MS medium ...

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Binder Behavior on Chromite-Carbon Composite

1. Introduction. According to Mantovani 1, Marcheze 2 and Zambrano 3-6, the production of high-carbon ferrochrome using carbon composite pellets by the self-reduction process at the laboratory level is a process that presents technological advantages.Some features are the usage of fine chromite ore and reducing agents and high efficiency and high productivity resulting from a high reaction ...

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Mining a domestic source of chromite: a mineral

2006-2-1  Free Online Library: Mining a domestic source of chromite: a mineral deposit in Oregon is being developed to be a significant source of chromite sand for U.S. metalcasting facilities, offering a cost-effective alternative to the current South African chromite choices. by "Modern Casting"; Business Metals, metalworking and machinery Casting (Metal) Founding Metal castings industry Mineral ...

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UG-Mat Foundry Sand Recycled Materials

Lime or cement treatment will have a beneficial effect on the strength of foundry sand mixtures. Addition of lime or cement will increase the unconfined compression and CBR of fully hydrated specimens. (9) Moreover, foundry sand-based subbase specimens

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The Effect of High Purity Rice Husk Silica Synthesised ...

Consequently, the overall strength-related properties of the rubber compounds are improved. Therefore, the main interest of this study was to synthesise high purity silica from rice husk as fillers in natural rubber using a simple solvent-thermal treatment with acid leaching. This method was modified from TAPPI T204 (2007) and TAPPI T264

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Silicon in the life and performance of turfgrass

2005-10-14  The effect of Si on plant resistance todisease is considered be due either an accumulation of absorbed Si in the epidermal tissue, or expression of pathogensis-induced host defense responses. Accumulated monosilicic acid polymerizes into polysilicic acid and then transforms to amorphous silica, which forms a thickened Si-cellulose membrane.

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