AP-42, CH 8.7: Hydorfluoric Acid
8.7 Hydrofluoric Acid. 8.7.1 General5-6. Hydrogen fluoride (HF) is listed as a Title III Hazardous Air Pollutant. Hydrogen fluoride is produced in 2 forms, as anhydrous hydrogen fluoride and as …
Fact Sheet: Hydrofluoric Acid | PennEHRS
Hydrofluoric acid (HF) is a strongly corrosive chemical. HF readily penetrates the skin and mucous membranes, and can cause deep tissue destruction. Severity and timing of effects depends on the concentration, duration of exposure, and penetrability of the exposed tissue. Symptoms may start immediately or pain may be delayed. Life threatening systemic …
Hydrofluoric Acid | HF | CID 14917
Hydrofluoric acid is an irritant to the mucosa of the upper and lower portions of the respiratory tract. As in ocular tissues, concentrations as low as 5 mg/L (5 ppm) may produce irritation to the nasal mucosa. When hydrofluoric acid is present in concentrations greater than 48%, the solution fumes, adding to the volatile airborne fraction. ...
HF production
Production of hydrofluoric acid (HF) The main grades of fluorspar available are: crude ore 25-30%. metallurgical grade 75-82%. ceramic grade 94-96%. acid grade 97%. crystalline grade 99%. The most demanded is the acid grade, …
Feldspar flotation flowsheet. | Download Scientific Diagram
Feldspar flotation flowsheet. ... Hydrofluoric acid (HF), which is the main regulator used in the flotation of feldspar, may cause serious environmental and health-related problems. Therefore, to ...
Safe Use of HF
Guidelines for the Safe Use of Hydrofluoric Acid A. Introduction Hydrofluoric acid (HF) has a number of physical, chemical, and toxicological properties that make it especially hazardous to handle. Both anhydrous hydrofluoric acid and aqueous solutions are clear, colorless, and highly corrosive liquids. When exposed to air, anhydrous HF and
A novel method for desulfurization and purification of …
Anhydrous hydrofluoric acid (AHF) and other fluorine compounds are mainy produced from the high-quality fluorite concentrates. ... Fig. 1 shows the flowsheet for AHF production, where fluorite reacts with concentrated sulfuric acid to form hydrofluoric acid under the reaction temperature of 160–200 °C, as described by Reaction (1) (Dreveton ...
Feldspar Beneficiation & Flotation Process
The flowsheet illustrated is typical for the average feldspar ore containing quartz, mica, garnet and other iron bearing silicates normally encountered in pegmatites or large dykes of alaskite-granite. ... All flotation is carried out in acid circuits, either with sulphuric acid or hydrofluoric acid both of which are highly corrosive to metal ...
Uses and Industrial Applications of Hydrofluoric …
Despite this characteristic, hydrofluoric acid is a relatively weak acid since it doesn't completely dissociate into water. How Hydrofluoric Acid Works. Hydrogen fluoride mixes with water to form hydrofluoric acid. …
Leaching of rare earths from Abu Tartur (Egypt) phosphate
The leaching of rare earth elements (REEs) from Egyptian Abu Tartur phosphate rock using phosphoric acid has been examined and was subsequently optimized to better understand if such an approach could be industrially feasible. Preliminary experiments were performed to properly define the design of experiments. Afterward, 24 full factorial design was …
HYDROFLUORIC ACID SCRUBBER SYSTEMS | Semantic Scholar
A laboratory study was initiated to (1) demonstrate the effectiveness of these scrubber solutions to sorb HF, (2) determine if unexpected reactions occurred at flowsheet conditions, and (3) determine the consequences of deviation from flowsheet conditions. Caustic or aluminum scrubber solutions remove hydrogen fluoride from off-gas streams.
Alkylation Technology Study FINAL REPORT
FINAL REPORT Document No.: AQMD-15-5087-005 Rev: 2 NEC Project No. AQMD-15-5087 Date: 9/9/2016 Client Project No.: Client: South Coast Air Quality Management District (SCAQMD) Project: Alkylation Technology Study
Alkylation Technology Study FINAL REPORT
Plot area for a Sulfuric Acid Alkylation unit (without onsite acid regeneration) or Solid Acid Alkylation unit is comparable to that for an HF Alkylation unit, although this is somewhat dependent on the capacity of the unit, as
Extraction Recovery of Tantalum (V) and Niobium (V) from Hydrofluoric …
Comparative study of extraction of tantalum(V) and niobium(V) with octanol and tributyl phosphate was made. The data on distribution of tantalum(V) and niobium(V) between octanol and hydrofluoric and hydrofluoric-sulfuric acid aqueous solutions were obtained. The flowsheet for preparation of pure tantalum and niobium oxides was developed.
CDC | Facts About Hydrogen Fluoride (Hydrofluoric Acid)
Facts About Hydrogen Fluoride (Hydrofluoric Acid) Related Pages. FACT SHEET. What hydrogen fluoride is. Hydrogen fluoride is a chemical compound that contains fluorine. It can exist as a colorless gas or as a fuming liquid, or it can be dissolved in water.
Fluorite Processing Methods and Flowsheet
Fluorite flotation was carried out in alkaline medium. They used oleic acid as a collector, sodium carbonate as a pH adjuster, and tannic acid as a calcite inhibitor. To Wrap Up. The above is the processing of fluorite ore. …
HYDROFLUORIC ACID, SOLUTION | CAMEO Chemicals | NOAA
HYDROFLUORIC ACID attacks glass and any other silica containing material. May react with common metals (iron, steel) to generate flammable hydrogen gas if diluted below 65%. Reacts exothermically with chemical bases (examples: amines, amides, inorganic hydroxides). Can initiate polymerization in certain alkenes.
MODIFICATIONS FOR THE STR FUEL RECOVERY …
chemistry of the STR hydrofluoric acid method of reprocessing zirconium- uranium alloy fuels, it has been shown that the process can be modified - to ... operation was not favored for flowsheet use. The batch and continuous dissolution and solvent extraction flowsheets are given embodying the principal results of this study. . .
Efficient Recovery of Niobium and Tantalum from
Currently, hydrofluoric acid leaching is the main industrial method for treating tantalum–niobium concentrates. Tin slag is an important secondary resource for tantalum and niobium extraction . In cassiterite smelting process, tantalum and niobium were enriched in the reducing slag along with other elements such as rare earth element, ...
Nuclear fuel cycle' Extractingg uranium from its ores
Acid leaching- Uranium ores vary significantly from deposit to deposit and each mill must be designed to fit the specific characteristics of its ore. The general process, however, is similar for many ores, variations of the acid-leach flowsheet shown in Figure 1 have been used in more than 20 nulls. The basic steps in this flowsheet are:
Hydrogen Fluoride (HF)
Hydrogen Fluoride also referred to as HF acid or Anhydrous HF is a clear, colorless corrosive liquid that is extremely hazardous. HF is a versatile chemical with diverse industrial …
Thermal and Mechanical Activation in Acid Leaching …
The most common process flowsheet recommended by the researchers for alumina recovery can be summarized into four basic steps: (1) ... Murat M, Driouche M (1988) Chemical reactivity of thermally activated clay minerals estimation by dissolution in hydrofluoric acid. Cem Concr Res 18(2):221–228.
PRODUCTION OF IONIUM FROM A PITCHBLENDE RESIDUE
A plant designed for concentrating thorium by extraction from pitchblende residue by use of tributyl phosphate followed by hydrofluoric acid strip is described. The fluoride product is further purified by a solvent extraction flowsheet in hot laboratory equipment. An outline of the chemical technology used in this process is presented.
TCAP Aluminium Dissolution Flowsheet Basis
The Actinide Technology Section has proposed the use of an nitric acid HNO3 and potassium fluoride KF flowsheet for stripping palladium Pd from palladium-coated kieselguhr Pd/K and removing aluminum (Al) metal from the TCAP coils. The basis for the HNO3-KF flowsheet is drawn from many sources. A brief review of the sources will be presented. The basic …
Pickling and Passivating Stainless Steel
Mixtures of nitric and hydrofluoric acids are usually used for pickling stainless steels. Pickling is the process used to remove weld heat tinted layers from the surface of stainless ... Acid treatments alone cannot be relied upon to remove oil, grease or inorganiccontaminants that can also prevent the passive layer forming
Flowsheet of hydrofluoric acid process. The data are the …
Download scientific diagram | Flowsheet of hydrofluoric acid process. The data are the specific capacity of spherical graphite materials. from publication: Assessment of Spherical Graphite for ...
Hydrofluoric Acid Fact Sheet
Hydrofluoric Acid Fact Sheet . This fact sheet is for general safety awareness. Individual Standard Operating Procedures for all experiments and processes involving hydrofluoric …
Typical process block diagram for the …
Fig. 1 shows the flowsheet for AHF production, where fluorite reacts with concentrated sulfuric acid to form hydrofluoric acid under the reaction temperature of 160e200 C, as described by Reaction ...
LABORATORY DEVELOPMENT OF THE PERFLEX PROCESS …
technical report: laboratory development of the perflex process for dissolution of uranium alloy fuels in hydrofluoric acid-hydrogen peroxide solutions
Dissolution of plutonium oxide in nitric acid at high hydrofluoric acid …
@article{osti_7036488, title = {Dissolution of plutonium oxide in nitric acid at high hydrofluoric acid concentrations}, author = {Kazanjian, A R and Stevens, J R}, abstractNote = {The dissolution of plutonium dioxide in nitirc acid (HNO/sub 3/) at high hydrofluoric acid (HF) concentrations has been investigated. Dissolution rate curves were obtained using 12M …