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microwave exfoliation vermiculite

Microwave Exfoliation of Vermiculite and Phlogopite

Considering the strong interaction between water and microwaves, the effect of microwave power on exfoliation characteristics of vermiculites and phlogopites after treatment with water and hydrogen...

MICROWAVE EXFOLIATION OF VERMICULITE AND PHLOGOPITE

Vermiculites and phlogopites can be exfoliated by chemical and thermal treatment methods to obtain chemically inert, adsorbent, fire-resistant, low-density materials with excellen

Continuous energy efficient exfoliation of vermiculite

Nov 21, 2012 The concept of using microwave energy to exfoliate vermiculite is not new. For example US Patent 3758415 (Wada, 1973) reported pre-treatment of vermiculite ore with polar molecules before microwave exfoliation.

Microwave technology of vermiculite exfoliation

Microwave technology of vermiculite exfoliation Essentially, such heat carriers as incandescent gas or intensive infrared rays are not needed for heating vermiculite. Heating of vermiculite is conducted by microwave energy in a special chamber, a microwave reactor that can be compared to a houshold microwave oven.

Exfoliation of vermiculites with chemical treatment using

Jan 01, 2014 Appearance of exfoliated Libby flakes after being irradiated with microwaves for 20 s. The expansibility values (k) obtained under microwave treatment and H 2 O 2 solutions at 30 and 50%, respectively, during 20 s for the vermiculite from Goiás were 8.14 and 7.13.

Folorunso, Olaosebikan (2015) Microwave processing of

microwave exfoliation of vermiculite has been limited to laboratory scale using domestic microwave ovens (2.45 GHz, power below 1200 W) and the route to scale up the process to industrial capacity has not given due consideration.

Microwave processing of vermiculite Nottingham ePrints

The continuous microwave exfoliation tests carried out at both pilot scale at 53-126 kg/h and the scaled up system at 300-860 kg/h demonstrated that microwave energy can be used for the industrial exfoliation of vermiculite at high throughputs and is able to produce products below the specified product bulk densities standard required by The Vermiculite Association (TVA).

On the mechanism of exfoliation of ‘Vermiculite’ Clay

Microwaves have also been employed successfully by several investigators as an alternative thermal method to exfoliate vermiculite (e.g. Obut et al., 2003; Marcos & Rodríguez, 2011). As well as thermal methods, vermiculite may also be exfoliated chemically.

US8728348B2 Microwave processing of feedstock, such as

Ways of applying microwaves to feedstock to be processed are disclosed. One embodiment relates to heating inter-layer water in vermiculite to expand the vermiculite. Another embodiment relates to heating water in oil-contaminated materials and waste products, such as drilling cuttings, contaminated soils and certain types of animal by-products, to drive out oil.

Microwave technology of vermiculite exfoliation

Microwave technology of vermiculite exfoliation Essentially, such heat carriers as incandescent gas or intensive infrared rays are not needed for heating vermiculite. Heating of vermiculite is conducted by microwave energy in a special chamber, a microwave reactor that can be compared to a houshold microwave oven.

Microwave processing of vermiculite Nottingham ePrints

The continuous microwave exfoliation tests carried out at both pilot scale at 53-126 kg/h and the scaled up system at 300-860 kg/h demonstrated that microwave energy can be used for the industrial exfoliation of vermiculite at high throughputs and is able to produce products below the specified product bulk densities standard required by The

Preparation of Expanding Vermiculite by Chemical and

All work reported so far on microwave exfoliation of vermiculite has been limited to laboratory scale using domestic microwave ovens (2.45 GHz, power below 1200 W) and the route to scale up the

(PDF) Understanding the performance of a pilot vermiculite

The continuous microwave exfoliation system This process was repeated three times for a fresh sample of the same grade of vermiculite exfoliated at the same microwave Microwave exfoliation of all the samples was studied using a power and throughput and the effective bulk density was calcu- 150–200 kg/h continuous microwave system (see Fig. 2).

British Library EThOS: Microwave processing of vermiculite

The continuous microwave exfoliation tests carried out at both pilot scale at 53-126 kg/h and the scaled up system at 300-860 kg/h demonstrated that microwave energy can be used for the industrial exfoliation of vermiculite at high throughputs and is able to produce products below the specified product bulk densities standard required by The

e2v launches ProWave pioneering vermiculite exfoliation

12 May 2011 e2v launches ProWave pioneering vermiculite exfoliation system. e2v, the leading global provider of technology solutions for high performance systems, has unveiled a revolutionary new industrial microwave system for the exfoliation of vermiculite,

On the mechanism of exfoliation of ‘Vermiculite’

exfoliating vermiculite is by short lived rapid so called ‘shock’ or ‘flash’ heating. Commercially, this is usually achieved by heating to temperatures of around 900ºC for a few minutes or more in a vertical or rotary furnace (Hindman, 2006). With some vermiculites in the laboratory the onset of exfoliation

VERMİKÜLİTLERİN MİKRODALGA GENLEŞME ÖZELLİKLERİ

In this study, microwave exfoliation characteristics of eight vermiculite and one phlogopite sample were determined using a kitchen type microwave oven considering power and reaction time. Same samples were also expanded at flame and the results obtained were compared so as to determine the differences between the exfoliation behaviours.

olaosebikan folorunso University of Nottingham

interaction of microwave fields with such materials has been used to develop a pilot scale microwave based process for the exfoliation of vermiculite. During commissioning of the system it was noted that vermiculites from different geographical sources behaved very differently in

The effect of microwave radiation on mineral processing

Synopsis Between 50% and 70% of the total energy used in the extraction process may be attributed to comminution. Microwave pre-treatment has been suggested as a means to decrease the energy

WO2013038184A1 Microwave processing of feedstock

A method and apparatus (10) for processing feedstock such as vermiculite (34)or oil- contaminated drill cuttings using microwaves is described. The method involves removing ferrous material form the feedstock by magnetic separation (46) before exposing the feedstock to microwaves. This reduces arcing in the microwave cavity.

Microwave preparation of raw vermiculite for use in

This study sought to determine optimum conditions for the microwave exfoliation of raw vermiculite and examined the removal characteristics of copper ions from water by the processed vermiculite. When 100 g of raw vermiculite was irradiated at 440 W for 330 s, 66% of the raw vermiculite was exfoliated.

e2v Launches Pioneering Microwave Vermiculite Exfoliation

May 16, 2011 Through its partnership with The University of Nottingham, UK, e2v has produced the new industrial microwave ProWave ® vermiculite processing systems that utilizes patented technologies to offer a multitude of benefits to the industry. Improved energy consumption is of critical importance to processing and manufacturing industries; the energy consumption...

Katrib, Juliano and Folorunso, Olaosebikan and Dodds

microwave energy has also been used in the processing of wide varieties of feedstock, such as food stuffs, agricultural products, polymers, waste treatment, and microwave treatment of coal [8-10]. The concept of using microwave energy to exfoliate vermiculite is not new, but there is a lack of understanding and

Environmental Impact Award winner

Winner The University of Nottingham, The microwave exfoliation of vermiculite Background Vermiculite is a naturally occurring mineral that is widely used in fireproofing, insulation and horticulture. In its natural form the mineral is in the form of thin layered platelets and

The 2011 Manufacturing & Process Innovation winner

Microwaves exfoliate vermiculite by evaporating the water in the mineral, with the build-up of pressure as the water expands and changes to steam, forcing the layers apart. The key to the process was determining a microwave frequency that would heat only the

Energy efficient technology of obtaining heat-insulating

The paper presents energy-efficient technology with using microwaves to swell vermiculite. Replacement of traditional firing of vermiculite during exfoliation due to the use of microwave heating is promising, primarily due to lower energy costs.

VERMİKÜLİTLERİN MİKRODALGA GENLEŞME ÖZELLİKLERİ

In this study, microwave exfoliation characteristics of eight vermiculite and one phlogopite sample were determined using a kitchen type microwave oven considering power and reaction time. Same samples were also expanded at flame and the results obtained were compared so as to determine the differences between the exfoliation behaviours.

Microwave Processing of Materials

microwave design, materials handling and chemical reaction engineering have been reported for different,each providing a basis for the scale up of the applications technology. In several cases including rock fracture and sorting, oil and drilling waste processing and vermiculite exfoliation this has led to the development of unique

WO2013038184A1 Microwave processing of feedstock

A method and apparatus (10) for processing feedstock such as vermiculite (34)or oil- contaminated drill cuttings using microwaves is described. The method involves removing ferrous material form the feedstock by magnetic separation (46) before exposing the feedstock to microwaves. This reduces arcing in the microwave cavity.

Katrib, Juliano and Folorunso, Olaosebikan and Dodds

microwave energy has also been used in the processing of wide varieties of feedstock, such as food stuffs, agricultural products, polymers, waste treatment, and microwave treatment of coal [8-10]. The concept of using microwave energy to exfoliate vermiculite is not new, but there is a lack of understanding and

Preparation of Expanding Vermiculite by Chemical and

Based on the characters of expanding and layer adsorbing of vermiculite,industrial vermiculite samples from Weili Mine of Xinjiang Province were expanded by both chemical and microwave chemical methods. The influences to the exfoliation ratio of different parameters such as concentration of hydrogen peroxide, power of the microwave, heating time, ratio of solid-liquid, immersion time were

Minerals Free Full-Text Modified Vermiculite as

This step was followed by the exfoliation of the vermiculite with (1) abruptly heating in an oven at 1000 °C for 1 min, and (2) with microwave irradiation in a microwave oven (SHARP R64sT) working at 2.45 GHz of frequency with 800 W of energy for 25 s.

The effect of microwave radiation on mineral processing

Synopsis Between 50% and 70% of the total energy used in the extraction process may be attributed to comminution. Microwave pre-treatment has been suggested as a means to decrease the energy

Minerals Free Full-Text Modified Vermiculite as

The aim of this study was to investigate the efficiency of removing Cr6+ from aqueous solutions using two exfoliated vermiculite: (1) heated abruptly at 1000 °C and (2) irradiated with microwave radiation. The effects investigated were contact time, adsorbate concentration and initial Cr6+ concentration. The adsorption with both exfoliated vermiculites was well described by the DKR isotherm

Vermiculite: Structural Properties and Examples of the Use

Jul 02, 2012 Weiss et al. studied exfoliation of Mg-vermiculite after thermal, microwave and/or hydrogen peroxide treatments. A stronger than hydrogen peroxide oxidation agent potassium persulfate (K 2 S 2 O 8) used Matějka et al. to delaminate/exfoliate Mg-vermiculite. The vermiculite treatment with potassium persulfate solution caused a collapse of the

Structural Changes in Vermiculites Induced by Temperature

Microwave irradiation of vermiculite samples caused much less water loss than they do when subjected to sudden high-temperature heating; it also caused exfoliation of the material. From a structural point of view, the X-ray diffraction patterns of the vermiculites of Sta. Olalla, China, and Libby showed loss of crystallinity and disorder.

Permittivity and AC conductivity measurement of hydrated

Sep 11, 2015 The study demonstrated that AC conductivity of vermiculite is dependent on the frequency and loss and that this dependency influences the exfoliation rate of vermiculite when exfoliated by microwave radiation.