Flotation studies on low grade graphite ore from eastern India

Vasumathi, N; Kumar, T Vijaya; Ratchambigai, S.; Rao, S Subba; Raju, G Bhaskar

doi:10.1016/j.ijmst.2015.03.014

Cited by 30 publications

(16 citation statements)

References 14 publications

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“…Graphite tailings are derived from froth flotation process of graphite ores [1]. With the increase in graphite production, the massive tailings containing hydrocarbon oil, diesel oil, and heavy metals have been generated during the past years in China, which pollute environment and occupy a large amount of land.…”

Section: Introductionmentioning

confidence: 99%

“…In conductive concrete, conductive materials [10][11][12] that replace ordinary concrete aggregates provide with high electrical conductivity, and conductive materials usually include graphite, steel fiber, and carbon fiber [13]. Graphite has good electrical conductivity and pressure-sensitive characteristics, and it can be easily obtained in powder form [1]. Concrete added graphite powder will perform well conductivity, but former studies indicate that the strength of concrete will reduce rapidly with increasing graphite powder dosage [14].…”

Section: Introductionmentioning

confidence: 99%

“…When the graphite dosage is greater than 15%, the increase of the conductivity is not obvious, but the compressive strength decreases remarkably [15]. ere is some graphite left in the graphite tailings, so the graphite tailings can provide conductive materials for the conductive concrete [1]. e additions of graphite tailings can reduce the electrical resistivity of concrete, and the tailings have less effect on the strength of concrete than pure graphite because the graphite fuses with rock.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Electrical Characteristics of Graphite Tailing Concrete

Liu

Zhu

et al. 2018

Advances in Materials Science and Engineering

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The graphite tailing causes serious environmental pollution, and the pollution problem becomes worse and worse with the increase in graphite demands. This paper focuses on the graphite tailing concrete, which can alleviate the environment problem through utilizing graphite tailings. With the orthogonal experimental design, 16 groups of specimens were designed to investigate the compressive strength of the graphite tailing concrete, and each group had 6 specimens. The significance sequence of the influencing factors for the compressive strength was studied, including the ratio of water to cement, sand ratio, graphite tailings content, and carbon fiber content. The optimal contents of graphite tailings and carbon fiber were obtained from the further experimental study on the electrical characteristics of the graphite tailing concrete, and a regression analysis was conducted to develop the predictive mixture design relationships for the electrical resistivity of the conductive graphite tailing concrete. The experimental results show that the conductive concrete mixture containing graphite tailings and carbon fiber has satisfactory mechanical strength along with well electrical conductivity. With the increase in graphite tailings content, the compressive strength decreases slowly, but the electrical resistivity decreases much more obviously. Predictions with the proposed relationship are in reasonable agreement with experimental results. This study provides references for the graphite tailing utilization alleviating the environment problems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and Electrical Characteristics of Graphite Tailing Concrete

Liu

Zhu

et al. 2018

Advances in Materials Science and Engineering

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“…Therefore, the flotation process was simplified and the stability of each product was maintained. Furthermore, the high recovery achieved through this open circuit test fully indicated that the beneficiability of this graphite ore was particularly excellent because most graphite ores worldwide, including many large flakegraphite ores, were not capable of achieving such a high recovery using the similar open circuit process parameters [34][35][36][37]. In the conventional open circuit process, as shown in Figure 7a, the raw ore was subject to coarse rod grinding and rough flotation once each, with the rough concentrate then successively reground five times and refloated six times, with pebble as the only regrinding medium for all the regrinding process.…”

Section: Open Circuit Testsmentioning

confidence: 99%

Preserving Flake Size in an African Flake Graphite Ore Beneficiation Using a Modified Grinding and Pre-Screening Process

Qiu

Zhang

2017

Minerals

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As the high value and the scarcity of large-flake graphite ore resources, it is in the best interest to maximize the amount of large flakes and minimize any processing that will reduce flake sizes. In the study, the mineralogy of an African graphite ore was estimated using X-ray diffraction (XRD), X-ray fluorescence (XRF), and optical microscope analyses. The results indicated that it was a heavily weathered large flake graphite ore and the main gangue minerals were quartz and kaolinite. The graphite flakes were thick, bent, and fractured, and some clay minerals were embedded into the graphite interlayer, which made it difficult to prevent the large flakes from being destroyed using mechanical grinding methods. An approach of steel rod coarse grinding and pebble regrinding effectively reduced the destruction of graphite flakes and improved the grinding efficiency. In addition, comparing with the conventional process, a pre-screening process was applied and the content of large flakes in the final concentrate was significantly improved.

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“…The main advantages of the column flotation cells over mechanical ones include excellent separation ability, low capital and operating cost, a less demand for plant space, simple circuit and efficient selfcleaning and adaptability to automatic control [8,14]. Also, the performance of the column is superior to that of conventional cell owing to the presence of large fines in the coal [15][16][17]. Upgrading of coal in a flotation column can be significantly improved when froth stability is properly controlled through the manipulation of appropriate variables such as gas flow rate, froth height and feed solid concentration [18].…”

Section: Introductionmentioning

confidence: 99%

Fine coal beneficiation by pilot column flotation

Vasumathi¹,

Vijayakumar²,

Prasad³

et al. 2018

J Min & Metal A Mining

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Beneficiation of coal fines with high ash content was attempted in an operating coal preparation plant by retrofitting a 0.5 m diameter pilot plant scale flotation column in the circuit. The collector and frother dosage were optimized as 0.680 kg/t and 0.058 kg/t respectively. At these reagent conditions the operating parameters of pilot scale flotation column were also optimized. The maximum yield of the froth obtained was 67.5% at the targeted ash level of 14% from a feed of 25% ash content. This was obtained at the operating parameters of 0.85 cm/s superficial air flow velocity, 0.57 cm/s superficial feed slurry velocity and 600 mm froth height. The performance of flotation column was found to be marginally better than that of the conventional flotation cells in the washery. Also, advantages such as low operational, maintenance and energy costs and operational flexibility in the case of flotation column could lead to financial accruals over a long run.

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Flotation studies on low grade graphite ore from eastern India

Cited by 30 publications

References 14 publications

Mechanical and Electrical Characteristics of Graphite Tailing Concrete

Mechanical and Electrical Characteristics of Graphite Tailing Concrete

Preserving Flake Size in an African Flake Graphite Ore Beneficiation Using a Modified Grinding and Pre-Screening Process

Fine coal beneficiation by pilot column flotation

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