Aug 30, 2019 In this study, the influence of dissolved ions presents in the process water of an Indian coal preparation plant is investigated on flotation behavior of coal by a combination of release analysis, batch flotation tests, dynamic froth stability measurements, surface tension measurements, contact angle measurements, zeta potential measurements ...
OSTI.GOV Technical Report Coal-flotation chemistry. Final report, 1975-1981
The flotation results showed that 90 of the coal particles float within 1 min which suggests rapid flotation kinetics in the presence of salt ions. These results also indicated that a poor flotation response for particles coarser than 0.106 mm.Coal flotation in bore water was also investigated to understand the surface chemistry of coal flotation.
The presence of certain alkali earth metal ions e.g., Ca , Mg could adversely affect flotation as they precipitate sparingly soluble hydroxyl complexes on the coal surface and change its surface charge. The effectiveness of the flotation process can be increased by reducing the dissolved ions in the recycled water through softening process.
In this work, the effect of ultrasonic pretreatment time on oxidized coal flotation was studied. Analytical techniques, such as particle size distribution PSD, scanning electron microscopy SEM, X-ray photoelectron spectroscopy XPS, contact angle measurement, and specific surface areapore analysis, were used to examine the changes in the physicochemical characteristics of the coal ...
A reagent and a method for using the reagent for treating a solid material disposed in a liquid medium and having an oxygen-controlled surface condition. The reagent includes a liquid hydrocarbon, a reducing material and an activator material. The liquid hydrocarbon has a specific gravity different from the specific gravity of the liquid medium.
1.Introduction. Coal is an important natural resource for electricity generation and the manufacturing of materials as steel, cement, absorbents, and carbon fibers .Coal is hydrophobic and it presents natural floatability due to its content of carbon, making possible its concentration by flotation.
Jan 11, 2016 The FLOTATION PROCESS is one of the commonest methods of extracting the valuable minerals from certain classes of ores, and it is generally more efficient as regards the recovery of the minerals than any other process applicable to the treatment of similar types of ores. The metallic contents of the minerals are recovered from the concentrates in a subsequent series of metallurgical operations ...
The release analysis for a refuse tailing coal slurry was carried out according to the procedure described by Dell 10,11. These tests were conducted in a cell flotation machine, with slurry concentration of 20 ww 1,000 ml of tap water and 200 g of coal, and impeller speed of 1,500 rpm. After conditioning, the air inlet valve was opened ...
Feb 01, 1994 Several nonionic surfactants and one anionic surfactant were tested to enhance the flotation response of a low-rank coal. The nonionic surfactants included an ethoxylated octyl phenol and several polypropylene-polyethylene block copolymers, and the anionic surfactant was a dioctyl sulfosuccinate. All of the surfactants improved the yield significantly, but the influence on grade was
depress coal flotation in the pH region of metal hydroxide precipitation Ye et al., 1989 Baker and Miller, 1971 Celik and Somasundaran, 1980. Also, adsorp-tion of humic substances on the surfaces of coal and coal-containing minerals was reported to result in a significant decrease in the coal flotation
Laboratory flotation of synthetic coal-pyrite mixtures and high- pyritic-sulfur coal indicated that ferric chloride fecl3, aluminum chloride alcl3, chromium chloride crcl3, and cupric sulfate cuso4 are potential pyrite depressants. Pyrite was depressed in the ph range from 4.5 to 7.0 With ferric chloride, from 5.8 to 7.0 With aluminum chloride, from 6.4 to 7.1 With chromium chloride, and f
Jan 01, 1992 In 1989 a column flotation process was developed at the CAER, which enabled the economical recovery of coal fines from high-ash fine refuse. The laboratory design was expanded to commercial scale and installed at the Mayflower Coal Preparation Plant of Powell Mountain Coal Company in December, 1989.
chloride ions specifically adsorb on the coal surface. Effect of Salt Concentration on Coal Flotation. Coal flotation was conducted in triply distilled water as well as in NaCI electrolyte solutions. It is found that changes in solution pH and salt concentration have a very complex effect on the flotation behavior of coal
Water plays a critical role in various stages of flotation, which brings a lot of pressure to the flotation processing plants resided in dry areas. In this regard, it will be of significance to explore the feasibility of using wastewater resources in mineral flotation. Coal gasification brine CGB that contains a high concentration of salts becomes the subject of interest of this study. In ...
Flotation of coal using sea water The reason that sea water has been applied for coal flotation is mainly because in 1920 some coals were reported to be readily floated in sea water without the addition of reagents collector and frother. In 1930s, the flotation of coal using sea water was further investigated by Russian researchers 8.
Aug 10, 2018 Flotation tests were conducted in a 2-liter Denver cell using 125 grams of coal in a pulp at 6.25 solids content at the natural pH pH 4.5 0.5 for Illinois No. 6 and pH 3.5 0.3 for both Upper Freeport PA and Pittsburgh No. 8 coals of each coal.
Sep 12, 2018 Reverse flotation of coal can be explained as a process where valuable minerals are depressed, while undesired and unhealthy minerals are floated with the help of some reagents. Nowadays, conventional enrichment method of coal could not achieve removing unhealthy minerals partially from internal structure of coal such as sulfur, Hg, Au, which propagate in air after burning
The effects of Ca2, Mg2, Al3, and Fe3 on the flotation behaviors of apatite, dolomite and quartz were investigated through a micro-flotation test, and the influence of calcium ions on the flotation of these minerals was further elucidated by solution chemistry study, zeta potential measurement, and X-ray photoelectron spectroscopy XPS analyses.
system on the quartz flotation during enrichment process of vanadium-bearing coal was studied by different flotation technology and ion dissolution. In this paper, the results of these investigations were discussed and the role of ether diamine collector and calcium ion dissolution in quartz flotation
US4452714A US06030,080 US3008079A US4452714A US 4452714 A US4452714 A US 4452714A US 3008079 A US3008079 A US 3008079A US 4452714 A US4452714 A US 4452714A Authority US United States Prior art keywords reagent oxygen coal bituminous coal flotation Prior art date 1977-09-30 Legal status The legal status is an assumption and is not a legal conclusion.
of studies in the literature indicating that dissolved ions in flotation pulps induce important effects on the flotation of minerals such as potash, trona, and borax soluble minerals in brine solutions Ozdemir, 2013. These studies have advanced some mechanisms to explain flotation of coal and other minerals in inorganic electrolyte solutions.
Coal flotation test were conducted with a 1 l single-chamber laboratory flotation machine type 136FL using 100 g mixture of coal, coal- ... 8.2 may be due to the presence of a high concentration of ferrous ions which results from the high solubility of coal-pyrite figure 2..
Dec 05, 2006 Flotation of coal generally exhibits a maximum around neutral pH. This maximum, despite the marked mineralogical heterogeneity, has been attributed to the isoelectric point of the coal in this pH region. The results obtained in this study demonstrate the important role of multivalent ions in determining the pH dependence of flotation.
May 05, 2017 Using 6 10 -5 M EDTA together with 2.5 10 -4 M octanohydroxamic acid and 0.05 gL sodium silicate, monazite recovery of more than 90 was achieved while only recovering 20 of calcite. Based on the fundamental study, rare earth concentrates with 4700 ppm of REEs were produced from the Fire Clay fine coal refuse using column flotation.
Mar 05, 2019 The flotation behaviors of muscovite and calcite have been widely reported , , , , but the flotation separation of these two minerals in solution with respect to the flotation of decarburized stone coal which contain a large number of metal ions are still unclear. This work focused on the flotation removal of the calcite from the decarburized ...
Separation of naturally hydrophobic particles, such as coal, by flotation is known to be enhanced with the addition of salt solutions into the system. In this study, the flotation of bituminous coal in the presence of NaCl, KCl, CaCl2 and MgCl2 without use of any flotation chemicals was investigated in detailed. In addition, zeta potential and foam stability tests were performed.
May 01, 1992 This investigation is an exploratory study to evaluate a large number of potential pyrite depressants for use during coal flotation. Subsequently, the more promising reagents can be evaluated in detail. Several reagent categories such as alkalis, lime, oxidizing agents, reducing agents, specific inorganic ions and dispersants that were found to be effective pyrite depressants are discussed here.
Jun 08, 2016 The flotation reagents can be added in a feed-forward fashion based on the plant raw coal tonnage. Automatic feedback control of the flotation reagent addition rates has been lacking due to the unavailability of sensors for determining the quality of the froth cell tailings.
floatation machine for sale philippines. Silver Ore Flotation Machinery Quarry Machine Plan Pdf. 100 ton per day copper ore crushing grinding and flotation plant copper ore flotation method is the most commonly used beneficiation methond to get the copper ore concentrate our company has rich experience in offering copper ore equipement and help the customer set up the copper ore.
Jul 01, 1995 OSTI.GOV Conference Decomposition of heavy metal-dodecylsulfate complexes generated by ion- and precipitate-flotation
EFFECT OF MULTIVALENT IONS ON COAL FLOTATION 397 EQUILIBRIUM pH AG. 2. Abstraction of calcium and aluminum from coal SL 0.04. range of 2 to 1O, there is a marked decrease in flotation beyond both extremes. This behavior is in agreement with the reported literature data 11. 12. Addition ofNaCI was found to produce no appreciable change except
Sep 29, 2003 Coal flotation is a complex process involving several phases particles, oil droplets and air bubbles. These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.
Sep 01, 2013 Abstract. The microflotation of three single minerals, mixed coalkaolinite and mixed coalmontmorillonite were examined to study the effects of clay and calcium ions on coal flotation. The results show that the ash content of flotation concentrate increases by 3 in the presence of clay minerals, and the ash content would further increase by 3 in co-presence of clay minerals and high