Applications of two electric arc plasma torches for the beneficiation of natural quartz

Grishin, Yuri-Mikhailovich; Miao, Linlin; Borisov, Lev-Alekseevich; Serykh, N.V.; Kulagin, A.A.

doi:10.1007/s12613-019-1734-8

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…Practically, it is difficult to theoretically evaluate the enrichment efficiency of quartz concentrate, which depends on a variety of physical-chemical interaction mechanisms. The results in [6] showed that the high enrichment efficiency of quartz concentrate is always accompanied by a high thermal destruction degree-the presence of cracks in particles and the split of large particles into smaller one. As a result, the excess of the thermal stress in particles (due to non-uniform particle temperature field) above the ultimate destruction strength could be considered as a comprehensive criterion for evaluating the thermal destruction degree and enrichment efficiency of quartz concentrate.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results [4,6] showed that the total mineral impurities in quartz concentrate could be reduced by almost 5-10 times from 100-120 ppm to 10-20 ppm by using the electric arc torch as a plasma generator within power up to 20 kW. However, the arc materials are always found in the HPQ concentrate and limit its final purity level.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Miao¹,

Grishin²

2020

Plasma Sci. Technol.

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Numerical simulation of turbulent mixing process of polydisperse quartz particle (particle size distribution in the range of 0.1-0.4 mm) flow with Ar and Ar-H 2 plasma generated by radio frequency inductively coupled plasma (RF-ICP) torch has been made. An approximate two-stage approach has been proposed to calculate the spatial-temporal distributions of temperature and resulting thermal stress in quartz particles during dynamic heating in polydisperse plasma flow. The influence of working gas compositions, particle size distributions, injection angle and flow rate of carrier gas on the thermal destruction conditions of quartz particles has been determined under different particle feed rates. It is found that all the solid quartz particles (0.1-0.4 mm) could be thermal destructed without overheating in RF-ICP torch system, when the hydrogen volume fraction in working gases is more than 1.5%-2% and particle feed rate is in a certain range. The values of the maximum and minimum feed rates have been determined under different hydrogen volume fractions. An optimal particle injection angle and flow rate of carrier gas is found around 50°-60°and 160-220 slpm, under which the value of maximum equivalent thermal stress in quartz particles is highest.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Miao¹,

Grishin²

2020

Plasma Sci. Technol.

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“…The quartz particles are dynamically heated up when they are introduced into the thermal plasma flow and the thermal stress would arise in the quartz particles. Consequently, under a specific condition the quartz particles would be destroyed and the mineral impurities including some structural impurities can be effectively removed from the particles [8]. To some extent, the enrichment efficiency of quartz particles is directly related to the degree of thermobaric destruction [8].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, under a specific condition the quartz particles would be destroyed and the mineral impurities including some structural impurities can be effectively removed from the particles [8]. To some extent, the enrichment efficiency of quartz particles is directly related to the degree of thermobaric destruction [8].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies [7,8] have experimentally shown that the HPQ could be obtained in the final stage, when the quartz concentrates are introduced in an arc plasma torch followed by ultrasonic dispersion, sieving and drying. The defect of applying arc plasma torch for the quartz enrichment is that the metal arc materials in the plasma flow would pollute the HPQ concentrate.…”

Section: Introductionmentioning

confidence: 99%

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Influence of vacuoles with gas–liquid inclusions on the thermobaric destruction conditions of natural quartz under dynamic heating in an RF-TICP torch system

Miao

Nie²,

Grishin³

et al. 2023

Plasma Sci. Technol.

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In present work the turbulent mixing process of a polydisperse quartz particle flow with a plasma stream generated by an RF inductively coupled plasma torch were numerical studied. The thermobaric stress in the quartz particles under dynamic heating in a heterogeneous plasma flow was determined by a two-stage approximation approach. The effect of the presence of vacuoles in natural quartz on the particle thermobaric destruction conditions was studied. It was found that the equivalent thermal and baric stresses in quartz particles may significantly increase in the presence of vacuoles within a small gas volume fraction. The influence of the regime and energetic working conditions of an RF inductively coupled plasma torch system on the particle thermobaric destruction conditions was examined, and a recommendation was given to promote the degree of thermobaric destruction of quartz particles, which is of substantial importance for improving the overall enrichment efficiency of quartz concentrates.

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Deep insight into the reductive roasting treatment on iron removing from quartz

Yang

Zheng

et al. 2021

Advanced Powder Technology

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Applications of two electric arc plasma torches for the beneficiation of natural quartz

Cited by 5 publications

References 16 publications

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Dynamic heating and thermal destruction conditions of quartz particles in polydisperse plasma flow of RF-ICP torch system

Influence of vacuoles with gas–liquid inclusions on the thermobaric destruction conditions of natural quartz under dynamic heating in an RF-TICP torch system

Deep insight into the reductive roasting treatment on iron removing from quartz

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