The best pH for fluorite flotation in either pure water (collectorless flotation) or in the presence of surfactants (froth flotation) ranges from 7 to 11 [,,, ]. It was also shown that pH 9 is usually selected as the most suitable pH regardless of flotation reagents [54,55]. This pH value corresponds well to the zero charge point of fluorite.

A method is disclosed for beneficiating a fluorspar concentrate containing apatite as a gangue mineral, which includes further concentrating the fluorspar by a froth flotation process wherein the apatite is collected and floated with a cationic reagent in an acid flotation circuit and the fluorspar is depressed with fluoride ions.

Concentrating Fluorspar By Froth Flotation Nasa. The process of concentrating fluorspar by froth flotation of pulps containing fluorspar values comprising adding to the pulp a paper mill sulfite liquor an inorganic soluble fluoride and a fluorspar collecting agent selected from the class consisting of fatty acids and soaps and subjecting said ...

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Fluorite is usually separated from calcite by froth flotation method using large amounts of sodium silicate depressant, which can cause trouble in the loss of fluorite and wastewater treatment.

US2014405A US637528A US63752832A US2014405A US 2014405 A US2014405 A US 2014405A US 637528 A US637528 A US 637528A US 63752832 A US63752832 A US 63752832A US 2014405 A US2014405 A US 2014405A Authority US United States Prior art keywords flotation iron reagent ore froth Prior art date Legal status (The legal status is an assumption and is not a legal …

fluorspar repellent to water so it is easily removed by way of bubbles on top of the water in the flotation cell bank. Froth flotation is the process by which minerals are separated based on their attraction to water, in order to upgrade the mined ore into a saleable product. To …

Source: This article is a reproduction of an excerpt of "In the Public Domain" documents held in 911Metallurgy Corp's private library. Flotation of a Fluorspar Ore from Illinois. This report is the fourth in a Bureau of Mines series describing the sodium fluoride-lignin sulfonate-fatty acid process of froth flotation separation of fluorspar from complex ores containing fluorspar, barite ...

The froth flotation takes place in the presence of a collector reagent for the zinc sulfide such as the dithiophosphate and xanthate compounds well-known to the art. See, for example, U.S. Pat. No. 3,086,653 which describes the use of salts of dithiophosphate esters, such as the dialkyl esters, as flotation promotors.

froth layer. Particles that are retained in the froth are recovered at the lip of the froth weir at the edge of the flotation cell. The recovery of the froth is accomplished by the natural mobility of the froth which causes it to flow over the weir and the recovery is sometimes assisted by mechanical paddles.

Before fluorspar can be used to make hydrofluoric acid, the raw ore must be physically concentrated and purified. Ceramic and acid gr ades of fluorspar are concent rated (not shown) by crushing and grinding fluorspar, and purified by froth flotation. First the fluorspar is crushed and ground. Then lead and zinc sulfides are preferentially

3. Metallurgy: Communition, removal of gangue through froth flotation, concentration of fluorite to final product etc) 4. Mechanical: Availability of equipment, life of… Gained exposure to all mining activities in the Mine: 1. Geology: Exploration, Ore modelling, Core sampling, grade control. 2.

1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air …

FROTH FLOTATION "So many variables influence flotation that it will be long before every one of them can be investigated and its influence on the process determined." The froth flotation process was patented by E. L.Sulman, H. F. K. Pickard, and John Ballot in 1906, 19 years after the first cyanide process patents of MacArthur and the Forests.

Design Problems for Larger Cells. Circuit Design and Operation. After almost 60 years of application in this country froth flotation is still by far the most important process for concentrating metallic ores as well as a number of nonmetallic ores including fluorspar, phosphate rock, and potash. Its use on iron ores and coal is increasing.

In froth flotation both cells and columns are used. The column flotation stands out for its high efficiency in fine particles (slimes), its low cost of construction and assembly [ 15, 16 ]. Due to this fact, it is crucial to compare how fluorite flotation behaves in cell and …

A pilot plant, which began operation in October 1948, included froth flotation as an important concentration step. The premixed feed was heated with hot water and steam and the resulting pulp contained about 15% oil, 10 to 12% water for an average of 25% by weight of total liquids.

column flotation machine plus. Major items of equipment, fluorspar column flotation . ... Column flotation for coarse coal is supported by actual lab and plant test data that result in a full ...

The process of concentrating fluorspar by froth flotation of pulps containing fluorspar values, comprising adding to the pulp a paper mill sulfite liquor, an inorganic soluble fluoride, and a fluorspar collecting agent selected from the class consisting of fatty acids and soaps, and subjecting said pulp to froth flotation to recover the fluorspar.

The formation of slime particles in processes of minerals grinding limits froth flotation. Minera de Orgiva S.L. (Spain) produces slime sludge containing 41.05% of CaF 2 from a fluorite ore. Slimes have a very small particle diameter with very high specific surface area making this material difficult to process by froth flotation even when the grade of the material is high.

Mineral processing engineer with operations experience in PGM, Gold, Fluorspar, Copper, lead, zinc & iron ore beneficiation plants. Proven track record in effective production support, conceptualizing and implementing continuous improvement projects that improve production systems. Started my career with Minopex and Goldfields to develop as a ...

Microflotation was chosen as the technique used to relate flotation response to adsorption. The advantage of microflotation over other flotation systems, is its use of very small quantities of mineral and the ability to operate the system without the complicating froth phase.

Froth flotation is an important concentration process that can be used to selectively separate hydrophobic materials from hydrophilic waste gangue. In a more simple context, froth flotation is one of the most popular operational processes for mineral beneficiation. In ore/mineral beneficiation, froth flotation is a method by which commercially ...

Fluorspar ores as mined seldom meet commercial specifications, either with regard to fluorspar content or freedom from impurities, and suitable methods of concentration, such as froth flotation, must therefore be employed to recover commercial products from the low grade or contaminated ores.

US3430765A US478858A US3430765DA US3430765A US 3430765 A US3430765 A US 3430765A US 478858 A US478858 A US 478858A US 3430765D A US3430765D A US 3430765DA US 3430765 A US3430765 A US 3430765A Authority US United States Prior art keywords fluorspar pulp percent flotation ore Prior art date Legal status (The legal status is an assumption and is not a …

US3893915A US369892A US36989273A US3893915A US 3893915 A US3893915 A US 3893915A US 369892 A US369892 A US 369892A US 36989273 A US36989273 A US 36989273A US 3893915 A US3893915 A US 3893915A Authority US United States Prior art keywords fluorite flotation pulp ton alkali metal Prior art date Legal status (The legal status is an assumption and is not a …

One of the processes used for concentration of ores is Froth floatation process. This process is generally used for concentration of sulphide ores. Sometimes in this process we add NaCN as a depressant. NaCN is generally added in case of ZnS and PbS minerals. What is the purpose of addition of NaCN during the process of Froth floatation?

Fluorite Depressant - Froth Flotation …Fluorite flotation: please anybody suggest good depressants for silica and calcite in fluorite flotation.My specs are now: Raw fluorspar has CaF2 =60%, CaCO3=19.5%

Molecular formula of the common ore of aluminium. Answer. Al 2 O 3 .nH 2 O. iii. The oxide that forms salt and water by reacting with both acid and base. Answer. Aluminium Oxide ( Al 2 O 3 ) can react both an acid as well as a base to produce salt and water. iv. The device used for grinding an ore.

A comprehensive flotation study has been conducted on a Chinese fluorspar ore using the packed flotation column developed at Michigan Technological University (MTU). The results are compared with those for a conventional mechanical-flotation method on the same feedstocks. Key factors controlling flotation performance of both methods are evaluated based upon a simple statistic …

Pyrochlore, an economically important mineral source of niobium and tantalum, is recovered by flotation. Normally this requires numerous stages of concentrate cleaning because of the physical character of the froth, i.e., its consistency and stability. The use of 5-hydroxy quinoline as the collector/frother provides a froth with improved physical properties permitting a reduction of the ...