Fine particle flotation for Florida dolomitic phosphate pebbles

Gu, Zhengxing

doi:10.33915/etd.1251

Cited by 6 publications

(10 citation statements)

References 7 publications

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“…Where: with the results summarized in Table 4-9 (Gu et al, 2002). However, there are three disadvantages with the IMC cationic process.…”

Section: Pico-nano Bubble Column Flotationmentioning

confidence: 99%

Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator

Xiong¹

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Froth flotation is widely used in minerals industry. However, it is effective in a narrow size range, nominally 45-250 μm for coal and 10-150 μm for minerals. And the flotation performance of coal and minerals beyond this size range is not quite satisfactory. It is now recognized that the low-flotation efficiency of ultrafine particles is mainly due to the low probability of bubble-particle collision while the main reason for poor flotation recovery of coarse particles is the high probability of detachment of particles from the bubble surface. Pico-nano bubbles refer to tiny bubbles smaller than 0.5 μm, which can be produced using ultrasonic or hydrodynamic cavitation method. A fundamental analysis has shown that pico-nano bubbles will serve as a secondary collector, bridging between hydrophobic particles and conventional sized bubbles, which can significantly improve the flotation recovery of hydrophobic particles by increasing the probability of collision and attachment and reducing the probability of detachment. In order to obtain an optimal designed cavitation venturi tube for pico-nano bubbles' generation, different designs of cavitation venturi tubes were fabricated and tested in this study. The test results showed that maximum volume of pico-nano bubbles, 65% to 75%, and minimum mean pico-nano bubble size, 150 to 240 nm, were achieved at the medium ratio of the diameter of throat and outlet of the venturi tube (3 to 4), medium outlet angle (11°to 13°), high inlet angle (26° to 27°) and high ratio of the length of the throat and the diameter of throat (2.3 to 3). The laboratory-scale coal flotation tests showed that, the combustible material recoveries for coarse fractions,-700+355 μm, and ultrafines fraction,-75 μm, were remarkably increased in the presence of pico-nano bubbles in coal flotation. The maximum combustible recovery of 85 to 90% and minimum clean coal ash of 9.5 to 11% were achieved from 29.6% ash content of Pittsburgh No. 8 seam coal. At a given flotation combustible material recovery, more than half of the collector can be saved by using pico-nano bubbles in the column flotation. The frother dosage was also reduced to half. The laboratory-scale phosphate reverse flotation tests revealed that both the P 2 O 5 grade and P 2 O 5 recovery had been greatly improved in the presence of pico-nano bubbles. The column flotation using pico-nano bubble was capable of extending to float minus 75 m and 355-700 m particle size ranges much more effectively than column flotation with conventional sparger devices. The economic analysis performed in this study demonstrated that the application of pico-nano bubbles in both phosphate reverse flotation and coal flotation were economically feasible.

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“…Where: with the results summarized in Table 4-9 (Gu et al, 2002). However, there are three disadvantages with the IMC cationic process.…”

Section: Pico-nano Bubble Column Flotationmentioning

confidence: 99%

Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator

Xiong¹

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“…PA-31 was considered as one of the most effective collectors for reverse flotation of carbonate minerals, particularly dolomite. This reagent was also used as carbonate flotation collector for processing dolomitic phosphate resources in Florida (Gu andHwang, 1999, Grubber andZheng, 2002).…”

Section: Fatty Acids and Their Saltsmentioning

confidence: 99%

“…Based on previous research (Gu, 2002), four parameters were selected in this study. for downstream application.…”

Section: Modified Packed Column Flotationmentioning

confidence: 99%

“…Among those reagents used in this study, there is no doubt that the mixture of FAS-40A and DSS1 achieved better Selectivity Index than that of any other reagents. (Li, et al 2003).The packed flotation column was developed by Yang (Gu, 2002). It was designed to have a packing bed in an open column to provide smaller and longer torturous flow passages for sufficient time for particle/bubble contact and stabilize the froth layer inside the column.…”

Section: Ph Effect On Dolomite Flotation In Presence Of Dss1mentioning

confidence: 99%

“…Based on previous experience on the original packed column flotation of Florida dolomitic phosphate samples (Gu, 2002) as well as fine dolomitic phosphate pebble flotation using stirred-tank cell in this study, the control parameters considered in the experiment design included collector dosage, pH, slurry/froth interface level (froth height) and air flowrate. Considering the results of packed column flotation and stirred-tank cell flotation on dolomitic phosphate pebble samples, the operation conditions for the modified packed column flotation in this study were determined and listed in Table 4-2.…”

Section: Experiments Design For Modified Packed Column Flotationmentioning

confidence: 99%

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Dolomite flotation of high magnesium phosphate ores using fatty acid soap collectors

Gu¹

Self Cite

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The separation of dolomite from apatite has been recognized as one of the most difficult subjects in mineral processing due to the similarities in their physiochemical properties. In this study, selective surfactants were used with a fatty acid soap collector to improve the flotation performance of separating dolomite from high magnesium phosphate ores. Three surfactants, diethyl phthalate (DP), Tween-80 (TW) and derivative of sulfonate salt (DSS1) were used. Hallimond cell flotation was conducted using pure dolomite sample to determine the effects of various factors including dosages, particle size, Ca 2+ ions and slimes on the dolomite flotation recovery. The results showed that the surfactants can significantly improve dolomite flotation performance by increasing collecting ability and tolerating the effect of calcium ions and slime contents. The stirrer-tank cell batch flotation tests were carried out using two natural high magnesium phosphate ore samples containing 3.3% and 1.5% MgO. The test results showed that the surfactant DP could improve dolomite flotation at low dosages, and DSS1 could enhance the separation of dolomite from phosphate by improving both iii collecting ability and flotation selectivity. When 10% of DSS1 was used with the fatty dissertation committee Chair, Dr. Felicia F. Peng for her persistent guidance during the course of the research work. The valuable suggestions and comments by dissertation committee members, Dr.

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Energy conversion in phosphate ore grain mixture activated via ultra-centrifugal mill

Andrić

Terzić

Petrov

et al. 2015

International Journal of Mineral Processing

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Fine particle flotation for Florida dolomitic phosphate pebbles

Cited by 6 publications

References 7 publications

Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator

Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator

Dolomite flotation of high magnesium phosphate ores using fatty acid soap collectors

Energy conversion in phosphate ore grain mixture activated via ultra-centrifugal mill

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