Ceramic Sand Research Articles

Feasible Study on Using Recycled Ceramic Sand and Ultra Fine Sand in Combination

Research on performance of waste ceramics and ultra fine sand was carried on. And based on it, waste ceramics were crushed as recycled ceramic sand, and substituted for parts of ultra fine sand to make mortar. The feasibility, economic and social benefits of a combination of recycled ceramic sand and ultra fine sand was analyzed. The study provides us with a new solution for waste ceramics disposal and ultra fine sand usage.

Fluidity and Temperature Profile of Ductile Iron in Thin Sections

It has been shown that it is possible to produce thin wall ductile iron (TWDI) castings of considerable length using an Archimedes spirals with a wall of 1, 2 or 3 mm in thickness. The fluidities for different moulding materials [(classical mould, chemically bonded silica sand and chemically bonded low-density alumina-silicate ceramic sand (LDASC)], chemical composition, and pouring temperature were estimated. There is a significant temperature drop in thin sections (contrary to typical sections) during the mould filling. A profile of real temperature drop is presented along with theoretical predictions. The high temperature drop of liquid iron results in an increased cooling rate (before the eutectic equilibrium solidification temperature), which in turn affects the solidification and microstructure of TWDI castings. Microstructures were characterized quantitatively using an image analyser. Structure parameters for different wall thicknesses and moulding materials (graphite nodule count, ferrite and cementite fraction) are plotted, which is versus distance from the entrance to the mould cavity. It has been shown that the thin wall castings have a gradient structure. Moreover, a strong influence of LDASC sand (material with low ability to absorb the heat) on the structure parameters of TWDI castings is presented.

Orthogonal Experimental Study on Thermal Insulation Mortar Containing Mixed Ceramic Sand and Vitrified Micro Bead Aggregates

Orthogonal Experimental Study on Thermal Insulation Mortar Containing Mixed Ceramic Sand and Vitrified Micro Bead Aggregates

Orthogonal Experimental Study on Thermal Insulation Mortar Containing Mixed Ceramic Sand and Vitrified Micro Bead Aggregates

Mixed light aggregates can effectively reduce the coefficient of thermal conductivity of composite materials. Through orthogonal experiments of thermal insulation mortar containing mixed ceramic sand and vitrified micro bead aggregates, we analyzed the law of influence of relevant factors on the dry bulk density, coefficient of thermal conductivity and compressive strength of mortar containing mixed ceramic sand and vitrified micro bead aggregates and provided basic data for further improvement of such thermal insulation mortar so as to promote the development and application of high performance thermal insulation materials.

Experimental Study on Crack Resistance of Ceramic Sand Insulation Mortar

This article analyzes about four aspects of insulation mortar of various performance indicators, including anti-cracking, flexural strength and compressive strength, shear bond strength and shrinkage rate, it is concluded that the insulation mortar meets to various performance indicators requirement of masonry mortar or plastering mortar.

DRYING AND HARDENING OF CERAMIC MOULDS APPLIED IN THE INVESTMENT CASTING TECHNOLOGY - INVESTIGATIONS OF THE PROCESS KINETICS

Ceramic moulds applied in the investment casting technology are multilayer structures, built in an alternating process of depositing and drying of successive layers. Each individual layer is formed from a fluid (liquid) ceramic moulding sand and a grain matrix. In the current, environmentally technology fluid ceramic sands based on ethyl silicate are being substituted by ceramic sands containing colloidal silica as a binder. The ability and rates of drying and hardening of these new colloidal (water) ceramic moulding sands are quite different than of the ones which have a binder dissolved in alcohol. The kinetics of the process based on new binders is not well known. The technological principle requires that the successive layer deposition is done only when the one deposited previously is already sufficiently dry. Investigations of the possibility of application of some methods including: ultrasound, resistance and weigh method are presented in the paper. Advantages and disadvantages of each method are indicated as well as the assessment of their practical suitability is perfomed.

Some Key Points on High Strength Grey Iron Cylinder Block Production

Three key points are discussed to manufacture 300Mpa cylinder block castings. The first one is the design of grey iron chemical composition. The chemical composition used for production is as follows: C: 3.20-3.30%, Si: 1.60-1.80%, Mn: 0.70-1.00%, S: <0.10%, P: <0.06%, Cu: 0.70-0.80%, Cr: 0.25-0.35%, Ni: 0.30-0.40%, Sn: 0.06-0.08%. The stream inoculation is adopted. Another key point is to increase the chilling effect of molding material. A kind of ceramic sand is used in the experiment. The ceramic sand is mainly composed of electric fusion bauxite. The material gives much stronger chilling effect. The tensile strength can be 20 MPa higher compared with ordinary silica sand. The third key point is to use the technology of synthetic cast iron. The 300 MPa cylinder block is successfully developed.

RETRACTED ARTICLE: Compressive strength and durability properties of ceramic wastes based concrete

This paper presents an experimental study on the properties and on the durability of concrete containing ceramic wastes. Several concrete mixes possessing a target mean compressive strength of 30 MPa were prepared with 20% cement replacement by ceramic powder (W/B = 0.6). A concrete mix with ceramic sand and granite aggregates were also prepared as well as a concrete mix with natural sand and coarse ceramic aggregates (W/B = 0.5). The mechanical and durability performance of ceramic waste based concrete are assessed by means of mechanical tests, water performance, permeability, chloride diffusion and also accelerated aging tests. Results show that concrete with partial cement replacement by ceramic powder although it has minor strength loss possess increase durability performance. Results also shows that concrete mixtures with ceramic aggregates perform better than the control concrete mixtures concerning compressive strength, capillarity water absorption, oxygen permeability and chloride diffusion. The replacement of cement and aggregates in concrete by ceramic wastes will have major environmental benefits.

New Method for Estimation of Aeolian Sand Transport Rate Using Ceramic Sand Flux Sensor (UD-101)

In this study, a new method for the estimation of aeolian sand transport rate was developed; the method employs a ceramic sand flux sensor (UD-101). UD-101 detects wind-blown sand impacting on its surface. The method was devised by considering the results of wind tunnel experiments that were performed using a vertical sediment trap and the UD-101. Field measurements to evaluate the estimation accuracy during the prevalence of unsteady winds were performed on a flat backshore. The results showed that aeolian sand transport rates estimated using the developed method were of the same order as those estimated using the existing method for high transport rates, i.e., for transport rates greater than 0.01 kg m−1 s−1.

Capillary pressure method for measuring lipophilic hydrophilic ratio of filter media

Lipophilic Hydrophilic Ratio (LHR) was defined based on Washburn equation. The LHR values of five filter media were calculated from the wetting rates of cyclohexane (apolar) and water (polar) through compact filter media beds measured by capillary pressure method. The surface structures of filter media were characterized by X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR). It was confirmed by great regression coefficients and reproducibility of wetting rates that the values have a good reliability and the technique is applicable. The LHR values of nutshell, manganese sand, ceramic granule, quartz sand and ceramic sand are 66.87, 1.24, 1.22, 1.16 and 0.80, respectively, which shows that nutshell is much more lipophilic while manganese sand, ceramic granule and quartz sand are somehow more lipophilic than ceramic sand. This fact is consistent with the results of XPS and FTIR.

Characteristics of Artificial Ceramic Sand and its Behavior after Heat Treatment

Characteristics of Artificial Ceramic Sand and its Behavior after Heat Treatment

Coefficients of capillary mass transfer of porous solids based on curves of pore distribution

The coefficients of capillary conductivity, capillary diffusion, and thermal diffusion of a liquid are determined for porous ceramic and quartz sand using differential curves of pore distribution obtained experimentally.

Thermal and electrical characteristics of a high-frequency electrothermal fluidization bed

Based on an analysis of the thermal and the electrophysical characteristics of a fluidization bed with dielectric clay particles, a method has been developed of distending such particles by means of a high-frequency electric field for the production of ceramic sand.