our products

D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

microwave heating of refractory minerals

Microwave Heating Applications in Mineral Processing ...

10/12/2011  Walkiewicz et al. (1988 23, 1991 26) demonstrated that the rapid heating of ore containing microwave energy absorbing minerals in a non-absorbing gangue matrix generated thermal stress. This thermal stress caused micro fracturing along the mineral grain boundaries; as a result, such an ore sample becomes more amendable to grinding.

More

High Temperature Microwave Heating in Refractory Materials ...

ABSTRACT Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized.

More

Microwave Processing of Minerals

The main idea of microwave/infra-red (MW/IR) ore sorting is to use MW heating to selectively heat ore particles and separate particles based on their temperatures. This is based on the assumption that during the MW exposure some metal rich minerals tend to heat more than other minerals. A great challenge in this approach however, is to adapt

More

Microwave energy for mineral treatment processes—a brief ...

01/07/1999  The RD results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management.

More

High Temperature Microwave Heating in Refractory Materials ...

Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized.

More

Microwave Processing of Minerals

The main idea of microwave/infra-red (MW/IR) ore sorting is to use MW heating to selectively heat ore particles and separate particles based on their temperatures. This is based on the assumption that during the MW exposure some metal rich minerals tend to heat more than other minerals. A great challenge in this approach however, is to adapt

More

Microwave Heating Applications in Mineral Processing

2.1. Minerals in microwave field Conventional heat treatment of minerals is a process with high-energy consumption and it is not economical. Hence, researchers, searched for processes that are more effective. It is reported in a review paper by Xia and Pickles, 199716, that the earliest work on the microwaving of minerals began with a study of ...

More

The Effects of Power Level on the Microwave Heating of ...

The effect of power level on the microwave heating characteristics of a variety of reagent-grade chemicals and minerals has been determined in a Bureau of Mines study. Heating rates of the powdered samples are presented for incident power ranging from 500 to 2,000 W at 2.45 GHz. The apparatus consisted of a WR 975 waveguide-applicator mounted to WR 284 waveguide sections and connected

More

Recent developments in microwave processing of minerals ...

18/07/2013  One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal grinding. Each of the above areas is reviewed and the main reasons that have either ensured or hindered ...

More

Microwave heating characteristics of selected minerals and ...

Naturally occurring minerals and reagent-grade compounds were tested to determine their receptivity to microwave heating. The maximum temperature achieved for the samples and the time required to reach temperature are reported. A description of the microwave oven and a thermocouple technique that accurately measures and continuously records the temperature of samples during irradiation are ...

More

Microwave heating of magnesium silicate minerals ...

01/11/2018  The two main microwave heating mechanisms are dipolar rotation and ionic conduction, allowing a variety of materials, including minerals, to be heated upon exposure to microwave radiation . Microwaves are of interest for use in metallurgy because electric energy is efficiently converted to microwaves, microwaves transmit energy directly to samples without the need, for example, to first heat ...

More

MICROWAVE-ASSISTED DIGESTION OF MINERAL SAMPLES –

Microwave radiation generally refers to that part of the electromagnetic spectrum with frequencies between 300MHz and 300GHz (corresponding to wavelengths between 1mm and 1 metre). Heating of various materials by exposure to microwave radiation has been accepted practice for more than 60 years – the first patents for microwave ovens were taken out by the Raytheon Company (resulting

More

8302 Microwave Pretreatment Of A Refractory Gold

Applications of microwave heating. Bradhurst and Worner, 1990 discuss applications of microwave heating in mineral processing and pyromet-allurgy, including drying of coal, gold extraction and ore reduction (see also Standish and Huang, 1991 and Standish and Worner, 1991). Haque, 1987 has discussed microwave pre-treatment of refractory gold ores.

More

microwave mineral processing

Microwave Heating Applications in Mineral Processing. Microwave processing may provide substantial benefits in reducing energy consumption and environmental impact by this industry. In mineral processing, the extraction of values in an ore from the waste or gangue is an energy intensive and energy inefficient process.

More

microwave heating of refractory minerals – Grinding Mill China

microwave heating of refractory minerals... the use of microwave in refractory ore benification ... » Learn More. Microwave pretreatment of a double refractory gold ore . With direct microwave heating it was not possible to achieve the minimum temperature ... Treatment of carbonaceous refractory gold ore. Minerals Engineering, 4 ... » Learn More. gold refractory ores microwave assisted ...

More

Microwave Processing of Minerals

The main idea of microwave/infra-red (MW/IR) ore sorting is to use MW heating to selectively heat ore particles and separate particles based on their temperatures. This is based on the assumption that during the MW exposure some metal rich minerals tend to heat more than other minerals. A great challenge in this approach however, is to adapt

More

Microwave Heating Applications in Mineral Processing

2.1. Minerals in microwave field Conventional heat treatment of minerals is a process with high-energy consumption and it is not economical. Hence, researchers, searched for processes that are more effective. It is reported in a review paper by Xia and Pickles, 199716, that the earliest work on the microwaving of minerals began with a study of ...

More

Recent developments in microwave processing of minerals ...

18/07/2013  One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal grinding. Each of the above areas is reviewed and the main reasons that have either ensured or hindered ...

More

The Effects of Power Level on the Microwave Heating of ...

The effect of power level on the microwave heating characteristics of a variety of reagent-grade chemicals and minerals has been determined in a Bureau of Mines study. Heating rates of the powdered samples are presented for incident power ranging from 500 to 2,000 W at 2.45 GHz. The apparatus consisted of a WR 975 waveguide-applicator mounted to WR 284 waveguide sections and connected

More

The Use Of Microwave In Refractory Ore Benification

microwave heating of refractory minerals ... Microwave pretreatment of a double refractory gold ore Microwave-assisted grinding and liberation of processing. Read more. pretreatment of refractory gold ore with microwaves ... Study on Pretreatment of Refractory Gold Ore by Microwave roasting method was applied for the pretreatment of refractory ... Pretreatment of Refractory Ore in ...

More

Review Pretreatment Process on Refractory Gold Ores with As

eral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are selectively heating materials, fast heating rate and high heating efficiency. Microwave heating has the effect of reducing the tempera-ture of chemical reaction. So it can avoid generating gases of SO2 and As2O3 by controlling the ...

More

8302 Microwave Pretreatment Of A Refractory Gold

Applications of microwave heating. Bradhurst and Worner, 1990 discuss applications of microwave heating in mineral processing and pyromet-allurgy, including drying of coal, gold extraction and ore reduction (see also Standish and Huang, 1991 and Standish and Worner, 1991). Haque, 1987 has discussed microwave pre-treatment of refractory gold ores.

More

Mineralogical transformations of spodumene concentrate ...

The use of microwave irradiation as an alternative, potentially less energy intensive, method of heating is examined in this work. Spodumene concentrate was obtained from Greenbushes, Western Australia, and subjected to (i) direct and (ii) hybrid microwave heating. The results showed that spodumene concentrate is transparent to direct microwave irradiation. However, using hybrid heating, to ...

More

microwave mineral processing

Microwave Heating Applications in Mineral Processing. Microwave processing may provide substantial benefits in reducing energy consumption and environmental impact by this industry. In mineral processing, the extraction of values in an ore from the waste or gangue is an energy intensive and energy inefficient process.

More

microwave heating of refractory minerals – Grinding Mill China

microwave heating of refractory minerals... the use of microwave in refractory ore benification ... » Learn More. Microwave pretreatment of a double refractory gold ore . With direct microwave heating it was not possible to achieve the minimum temperature ... Treatment of carbonaceous refractory gold ore. Minerals Engineering, 4 ... » Learn More. gold refractory ores microwave assisted ...

More

Recent developments in microwave processing of minerals ...

18/07/2013  One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal grinding. Each of the above areas is reviewed and the main reasons that have either ensured or hindered ...

More

The application of microwave digestion in decomposing some ...

15/08/2018  A digestion time of 15 min for 3.0 g solid fusion agent mixture of sodium peroxide/sodium carbonate (Na2O2/Na2CO3) in a corundum crucible via microwave heating is sufficient to decompose 0.1 g refractory ore sample. An excellent microwave digestion solid agent should meet the following conditions, a good decomposition ability, an outstanding ability of absorbing microwave energy and

More

[PDF] Microwave Heating for Emolliating and Fracture of ...

Conventional heating can not be uniformly and promptly heat the rock. From this point of view only using microwave heating can be achieved volumetric heating of the material at high speed. The majority of rocks are dielectrics with losses, which are well absorbed microwave energy. Microwave discharge on dissemination elements of rock caused by the high electric fields can also lead to its ...

More

8302 Microwave Pretreatment Of A Refractory Gold

Applications of microwave heating. Bradhurst and Worner, 1990 discuss applications of microwave heating in mineral processing and pyromet-allurgy, including drying of coal, gold extraction and ore reduction (see also Standish and Huang, 1991 and Standish and Worner, 1991). Haque, 1987 has discussed microwave pre-treatment of refractory gold ores.

More

Experimental Study on Microwave Pretreatment with some ...

The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold ...

More

microwave pretreatment of a double refractory gold ore

Microwave Assisted Refractory Gold Processing Peru. microwave pretreatment Of double refractory gold ore microwave assisted leaching a review sciencedirect abstract double refractory gold ores, such as barricks goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. one possible remedy is to roast the ore and ...

More

Mineralogical transformations of spodumene concentrate ...

The use of microwave irradiation as an alternative, potentially less energy intensive, method of heating is examined in this work. Spodumene concentrate was obtained from Greenbushes, Western Australia, and subjected to (i) direct and (ii) hybrid microwave heating. The results showed that spodumene concentrate is transparent to direct microwave irradiation. However, using hybrid heating, to ...

More

microwave mineral processing

Microwave Heating Applications in Mineral Processing. Microwave processing may provide substantial benefits in reducing energy consumption and environmental impact by this industry. In mineral processing, the extraction of values in an ore from the waste or gangue is an energy intensive and energy inefficient process.

More

Refractory - Wikipedia

A refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Refractories are polycrystalline, polyphase, inorganic, nonmetallic, porous, and heterogeneous. They are typically composed of oxides or non oxides like carbides, nitrides etc. of the following materials: silicon ...

More