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3 edition of Preparation of Aluminum Fluoride From Alumina Hydrate and Dilute Fluoride Solutions. found in the catalog.

Preparation of Aluminum Fluoride From Alumina Hydrate and Dilute Fluoride Solutions.

United States. Bureau of Mines.

Preparation of Aluminum Fluoride From Alumina Hydrate and Dilute Fluoride Solutions.

by United States. Bureau of Mines.

  • 229 Want to read
  • 29 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 6524
ContributionsBlake, H., Koch, R.
ID Numbers
Open LibraryOL21741206M

Exchange Capacity of Activated Alumina vs. Fluoride Ion Concentration in Influent (20) 43 Figure Relation of Exchange Capacity and pH of Influent (20) 45 Figure Schematic Diagram of Fluidized Reactor System for Defluoridation Studies (1) 47 Figure Effect of Activated Alumina Particle Size on Fluoride Removal Capacity (1) Figure Aluminum Residual from Jar Tests, Fluoride Removal by Aluminum Sulfate, Aluminum Dose (mg/L) vs. Final Aluminum Concentration (mg/L) at five pH levels Figure Selected Aluminum Residual results from Jar Tests, Aluminum Dose (mg/L) vs. Final Aluminum Concentration (mg/L) at five pH levels.

  Activated alumina (AA) is the only filter material specifically designed to remove fluoride and arsenic from water. It is a ceramic compound made of aluminium oxide with a very high surface-area-to-weight ratio, AA has a very high capacity for fluoride adsorption. Most municipal water supplies add 2 ppm (parts per million) of fluoride.   Aluminium fluoride is the chemical compound with the formula AlF3. It has the consistency of a white powder. AlF3 is refractory, in strong contrast to the other halides of aluminium.

Aluminum fluoride, AlF 3, is used to make pure aluminum from oxidized aluminum. It consists of an aluminum atom surrounded by three fluoride atoms, connected with covalent bonds.   We claim 1. Continuous process for obtaining aluminum fluoride by reacting fluosilicic acid with an aluminous material, forming a suspension of insoluble silica hydrate and a supersaturated solution of α-allotropic aluminum fluoride, which reaction is carried out by using fluosilicic acid having a concentration of 5 to 25%, previously heated to approximately 60° to 95°C, and finely.


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Preparation of Aluminum Fluoride From Alumina Hydrate and Dilute Fluoride Solutions by United States. Bureau of Mines. Download PDF EPUB FB2

USA USA USA USA US A US A US A US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords aluminum acid solution aluminum fluoride fluoride Prior art date Legal status (The legal status is an assumption Cited by: Preparation of aluminum fluoride from alumina hydrate and dilute fluoride solutions.

Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Preparation of aluminum fluoride from alumina hydrate and dilute fluoride solutions Paperback – January 1, by Henry E.

Blake (Author) See all formats and editions Hide other formats and editionsAuthor: Henry E. Blake. Preparation of aluminum fluoride from alumina hydrate and dilute fluoride solutions /.

The majority of aluminium fluoride is produced by treating alumina with hydrogen fluoride at °C: Fluorosilicic acid may also be used make aluminum fluoride.

H 2 SiF 6 + Al 2 O 3 + 3 H 2 O → 2 AlF 3 + SiO 2 + 4 H 2 O. Alternatively, it is manufactured by thermal decomposition of ammonium ance: white, crystalline solid, odorless. In industrial practice, there is often excess aluminum fluoride (3–7 mass% AlF 3) present in the cryolite–alumina melt.A ternary eutectic exists at mass% Al 2 O 3, mass% AlF 3, and mass% Na 3 AlF 6 at °C.

Other constituents such as sodium chloride (NaCl), lithium carbonate (Li 2 CO 3), calcium oxide (CaO), magnesium oxide (MgO), or magnesium carbonate (MgCO 3) are. USA US05/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords gas alumina aluminum fluoride liquor method according Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Alumina is formed through a dehydroxylation process of aluminium hydroxide and there are many forms of transition alumina. Aluminas prepared at different pH and calcination temperatures have different chemical composition and surface properties [22], [23], [24].

Name / Formula / F.W. Concentration g/L Aluminum chloride M g AlCl 3 • 6H 2O M g Aluminum nitrate M g Al(NO 3) 3 • 9H 2O Aluminum sulfate M g Al 2(SO 4) 3 • 18H 2O Ammonium acetate M g NH. Alumina Defluoridation Model Simulator (AAD) that has to be developed, predicted that the dissolution of aluminium fluoride and aluminium complexes is more favourable to high fluoride concentration with low alumina dosage in pH range ofwhich may lead to increase in residual aluminium.

This article deals with the aluminium fluoride formula. Aluminium fluoride is a colourless solid, that happens to be an inorganic compound. Furthermore, aluminium fluoride has a white crystal appearance whose sublimation takes place at degrees. Moreover, this compound is. is heated with steam up to 95'C.

Aluminium tri-hydrate fluoride suspension is separated from the liquor solution at drum or belt vacuum-filters prior delivering materials with Vo humidity to. Aluminium fluoride dissolves slowly in strong sulfuric acid and releases hydrogen fluoride, and when mixed with strong aqueous alkali solutions, aluminate is formed.

Aluminium fluoride slowly decomposes in molten alkalis and forms fluorides and aluminate. Chemical stability Stable under normal circumstances. Aluminium chloride (AlCl 3), also known as aluminium trichloride, describe compounds with the formula AlCl 3 (H 2 O) n (n = 0 or 6).

They consist of aluminium and chlorine atoms in a ratio, and one form also contains six waters of are white solids, but samples are often contaminated with iron(III) chloride, giving a yellow color. The anhydrous material is important. Alumina Hydrate (Coarse) Aluminium hydroxide or alumina tri hydrate (ATH) is the hydrated oxide of aluminium.

Alumina hydrate is separated from bauxite ore using the Bayer process, with average particle size ranging from micron. The block crystals of alumina hydrate. Alumina Hydrate: Priced per pound Alumina Hydrate/ Alumina Hydroxide is a source of alumina in glazes.

It is more correctly referred to as Aluminu. Aluminium fluoride is used in turning alumina into aluminium. It lowers the melting point of alumina and boosts its electrical conductivity.

It is also used in the preparation of white enamels, as an anti-reflection coating in complex optical systems, as a constituent in welding fluxes, and in the preparation of fluorine containing glasses.

Aluminium fluoride is a colourless chemical compound with a molecular formula AlF 3. It is mainly used in the production of aluminium. It occurs naturally as oskarssonite and rosenbergite.

It can be manufactured synthetically too. The majority of aluminium fluoride is produced by treating hydrogen fluoride with alumina or aluminium oxide at of dissolved fluoride.

The alumina bed held up to 1 g of alumina, which was sufficient for XPS and XRD studies. Several samples were prepared by this method and the one referred to in this paper is labelled WF1.

Dry HF adsorption. An apparatus for adsorbing hydro- gen fluoride. In the pH range, selective precipitation of fluoride as an aluminium hydroxyfluoride hydrate product was achieved by neutralisation of the combined solutions with addition of 2 M NaOH.

The dehydration of aluminum fluoride trihydrate (AlF 3. 3H 2 O) above °C results in partial pyrolysis and the formation of aluminum oxide (Al 2 O 3) and hydrogen fluoride. This is prevented by first removing molecules of water at °C and then completing the drying with a short heating at °[email protected]{osti_, title = {Fluoride complexes of aluminum in sulfate solutions}, author = {Petrosyants, S.P.

and Buslaeva, E.R.}, abstractNote = {Aqueous solutions of aluminum sulfate and aluminum nitrate with additions of LiF have been studied by /sup 19/F and /sup 27/Al NMR. The formation of mono- di- and trifluoro complexes of aluminum has been established at LiF:Al mole .The fluoride capacity of the alumina is slightly greater for the 10 ppm level, but in both cases, it is around %.

These data are for alumina pretreated with aluminum sulfate; note the poor performance of the untreated alumina. Fluoride removal from a saturated calcium fluoride solution is shown in .