Upgrading of the process of technological pulp separation in modern pressure filters

Белоглазов, И. И.; Bazhin, V. Yu.; Zyryanova, O. V.

doi:10.17580/nfm.2016.01.07

Cited by 6 publications

(7 citation statements)

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“… *—the ratio of binder components is based on the previously performed series of experiments [ 13 , 16 ]. …”

Section: Figurementioning

confidence: 99%

“…Natural gypsum is also used as a sulfate component, i.e., combined (sulfate) activation [ 14 ]. A supersulfated binder (SSB) compared to ordinary Portland cement (OPC) has advantages such as low heat release during hydration, resistance to sulfates contained in the sea or ground water [ 15 , 16 ]. The main research in recent years has been devoted to the development of eco-friendly SSBs based on industrial by-products and wastes: slags, ash, phosphogypsum, cement dust, or lime-containing by-products of the chemical industry [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…A supersulfated binder (SSB) compared to ordinary Portland cement (OPC) has advantages such as low heat release during hydration, resistance to sulfates contained in the sea or ground water [ 15 , 16 ]. The main research in recent years has been devoted to the development of eco-friendly SSBs based on industrial by-products and wastes: slags, ash, phosphogypsum, cement dust, or lime-containing by-products of the chemical industry [ 16 ]. This makes it possible to completely eliminate the use of OPC in the composition of these binders with comparable strength characteristics to that of OPC.…”

Section: Introductionmentioning

confidence: 99%

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Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

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The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

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“… *—the ratio of binder components is based on the previously performed series of experiments [ 13 , 16 ]. …”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supersulfated Cement Applied to Produce Lightweight Concrete

et al. 2021

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“…La extracción del oro genera toneladas de residuos mineros que se depositan en la superficie, y gran cantidad de escombros son depositados sobre suelos naturales [3]. Los procesamientos de la explotación minera se consideran comúnmente como una de las fuentes clave de contaminación del suelo [4], [5], [6]. El daño ambiental puede llegar a ser irreparable si en el proceso de explotación se utilizan químicos como el cianuro y el mercurio, dejando zonas áridas y, como sucede en Colombia, extensas zonas de deforestación [7], [8].…”

Section: Introductionunclassified

La minería de oro sostenible: implicaciones del uso de los residuos como agregado para hormigón

Casadiego-Quintero

Monroy

Londoño

2021

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Es necesario extraer una gran cantidad de roca para obtener una cantidad mínima de oro, debido a que el oro se encuentra diseminado en parte por miles en el yacimiento. El proceso de extracción genera de manera significativa producto de desecho sólido debido al triturado del material, lo que genera desechos desde el tamaño bloque hasta la granulometría arenosa y fina. La mayoría de residuos terminan como depósitos en la superficie o en taludes que generan peligro de deslizamientos o daños en el suelo, otra gran parte del material del suelo termina siendo vertido en ríos y arroyos, lo que aumenta la tasa de sedimentación y la deposición de metales pesados. Las áreas que se dedican a la explotación de oro en Colombia se encuentran sobre las Cordilleras de los Andes, cerca nacimientos de agua, lo que genera que una cantidad importante de fuentes de agua se vean afectadas, además, las minas se encuentran en algunos casos cercanas a los páramos como el páramo de Santurban, una importante fuente de agua en el norte de Colombia. Las minas generan entre 5 y 8 toneladas diarias de residuo, lo que hace inmanejable la ubicación del material. Por medio de la petrografía y la difracción de rayos x se encontró un contenido importante de sílice proveniente del cuarzo, plagioclasas y micas.

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“…1,2 Various physical and chemical properties of polymers and large numbers of threads interlacing and forming weave patterns result in industrial fabrics which are widely used on the market as filter cloths. 3 Out of all possible cloth materials, polypropylene is the most widely used. 4 The central role of any filter medium in solid/liquid separation is to ensure the separation of a suspension into solids and clean filtrate.…”

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confidence: 99%

An improved procedure for calculating the pore size distribution of filter cloths in capillary flow porometry

Ängeslevä

Salmimies

Häkkinen

2023

Textile Research Journal

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Pore size distribution is one of the most important structural characteristics of filter cloths and can, in theory, be used to predict filtration performance. Capillary flow porometry is a common method to determine the pore diameter(s) and the pore size distribution of a porous material. Equipment applying this method has many advantages, but data processing and further calculations still require refining to be fit for purpose in calculations of flow capacity. The present study aims to develop a new procedure for processing volumetric flow rate data and corresponding pressure, which are measured by capillary flow porometry. The processed data are further used to calculate the pore size distribution of textile materials. Six industrial samples of polypropylene filter cloth were examined using scanning electron microscopy and capillary flow porometry. The raw data measured by the capillary flow porometer were processed using the developed method that considers changes in flow regimes as pressure increases. In addition, the nonideality of pores, originating from tortuosity, an irregular cross-sectional shape of the pore, and the number of pores, were considered in calculations by combining all these characteristics in one single parameter. This work shows that pores in a textile material are not ideal cylinders. The standard pore size distribution calculations should consider an imperfect pore structure and, therefore, be corrected.

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Upgrading of the process of technological pulp separation in modern pressure filters

Cited by 6 publications

References 0 publications

Supersulfated Cement Applied to Produce Lightweight Concrete

Supersulfated Cement Applied to Produce Lightweight Concrete

La minería de oro sostenible: implicaciones del uso de los residuos como agregado para hormigón

An improved procedure for calculating the pore size distribution of filter cloths in capillary flow porometry

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