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HYDROFLUORIC ACID AND SULFURIC ACID MIXTURE CAMEO

Reactivity Profile. HYDROFLUORIC ACID AND SULFURIC ACID MIXTURE reacts exothermically with bases of all kinds, both organic (amines, amides) and inorganic (oxides and hydroxides of metals). If diluted with water (below 65%) reacts with many metals (aluminum, zinc, iron, steel) to generate hydrogen gas with the possibility of explosion.

Hydrofluoric and sulphuric acid leaching of tantalite

Jan 01, 1989 Hydrofluoric and sulphuric acid leaching of tantalite C.F. Davidson and S.R. Crane 507 Salt Lake City Research Center, U.S. Bureau of Mines, 729Arapeen Drive, Salt Lake City 84108, Utah, U.S.A. ABSTRACT Tantalum and niobium extraction from domestic tantalite concentrates was studied by the United States Department of Interior, Bureau of Mines, using HF, H2SO4, and HF/H2SO4 mixtures.

US4342648A Direct flotation of pyrochlore Google Patents

Direct flotation of pyrochlore from its ore can be carried out at acidic pH using 1-amidoethyl-2-substituted imidazolines of the formula ##STR1## wherein R and R' are independently alkyl or alkenyl of 8 to 22 carbons, or their salts. In the presence of large amounts of carbonate in the ore, the pulp is acidified with hydrofluoric acid, fluosilicic acid, or their acid reacting compounds.

Alkylation Process

Alkylation Process Alkylation is the process of producing gasoline range material light olefins (primarily propylene and butylene) with isobutane in the presence of a highly acidic catalyst, either sulfuric acid or hydrofluoric acid. The product (alkylate) contains a mixture of

Hydrofluoric Acid (HF) from fluorspar

The process for manufacturing Hydrofluoric Acid is based on following reaction: CaF2 + H2SO4→ 2 HF + CaSO4. The process involves the following stages: Fluorspar drying, Sulphuric Acid manufacture from Sulphur, reaction of Fluorspar with Sulphuric Acid, Hydrofluoric Acid purification, scrubbing and by-product Calcium Sulphate neutralisation.

Density Functional Theory Study of Leaching Performance of

Apr 13, 2018 Several processing methods have been reported, including acid leaching, chlorination, and the alkali-fusion method.5, 6 Currently, most pyrochlore is processed by acid leaching, including hydrofluoric acid (HF) leaching, sulfuric acid (H 2 SO 4) leaching, and hydrochloric acid (HCl) leaching.2, 6, 7 Thomas et al.2 found that sulfuric acid can

US4342648A Direct flotation of pyrochlore Google Patents

Direct flotation of pyrochlore from its ore can be carried out at acidic pH using 1-amidoethyl-2-substituted imidazolines of the formula ##STR1## wherein R and R' are independently alkyl or alkenyl of 8 to 22 carbons, or their salts. In the presence of large amounts of carbonate in the ore, the pulp is acidified with hydrofluoric acid, fluosilicic acid, or their acid reacting compounds.

Extraction of Niobium from Tin Slag

pyrochlore associated and from degradated products of minerals sulfuric acid at 50oC but well above 175oC the concentrated acid dissolves the metal completely. The attack on this metal by hydrofluoric acid is to be used. A process is claimed whereby

TANTALUM, COLUMBIUM, AND FERROCOLUMBIUM

The concentrate or slag is digested with aqueous hydrofluoric acid (sometimes in conjunction with sulfuric acid) to form fluoride salts of the metals. Unreacted concentrate or slag (gangue) is removed by settling and decantation and is disposed of as a low level radioactive waste. This leaching process also generates an acid mist

Right to Know Hazardous Substance Fact Sheet

Sulfuric Acid can affect you when inhaled. Sulfuric Acid is a CARCINOGEN. HANDLE WITH EXTREME CAUTION. Sulfuric Acid is CORROSIVE and contact can severely irritate and burn the skin and eyes, and may lead to blindness. Inhaling Sulfuric Acid can irritate the nose and throat. Sulfuric Acid can irritate the lungs. Higher

Pyrochlore flotation SOQUEM

As afore-mentioned, the flotation of the columbium-bearing mineral is carried out in an acid circuit, i.e. at a pH of below 7, and acids such as hydrofluoric, sulfuric, hydrochloric and phosphoric may be used as pH modifiers. Hydrofluoric acid may be mixed with the oxalic acid or oxalate salt modifying agent in the flotation operation.

Processing of columbite-tantalite ores and concentrates

pyrochlore concentrates, whereas niobium compounds for nonferrous applications are exclusively produced from ores like columbites, tantalites, struverites or tin slag as byproducts for their tantalum content. Obtaining and Processing of Pyrochlore Concentrates. Concentrates containing 50-60 %

Caustic fusion of columbite-tantalite concentrates with

Diluted sulfuric acid (1:1) and iron powder are added to aid in dissolving the manganese; then more water is added to bring the sulfuric acid to about 1 molar. The insoluble residue which contains the niobic and tantalic acids is recovered by filtration. It is washed and then dried at

Hydrofluoric acid Sigma-Aldrich

Elemental Impurities according to ICH Q3D inhalation, Standard 3. Product Number. Product Description. SDS. 93679. TraceCERT®, in nitric acid and hydrofluoric acid (5% nitric acid and <0.5% hydrofluoric acid ), applicable for testing acc. to USP<232>, Ph.Eur. Gen. Chapter 5.20.

Sulfuric Acid NIOSH CDC

Sulfuric acid (H2S04) is a corrosive substance, destructive to the skin, eyes, teeth, and lungs. Severe exposure can result in death. Workers may be harmed from exposure to sulfuric acid. The level of exposure depends on dose, duration, and type of work being done.

Tantalum pentoxide Wikipedia

Tantalum pentoxide, also known as tantalum(V) oxide, is the inorganic compound with the formula Ta 2 O 5.It is a white solid that is insoluble in all solvents but is attacked by strong bases and hydrofluoric acid. Ta 2 O 5 is an inert material with a high refractive index and low absorption (i.e. colourless), which makes it useful for coatings. It is also extensively used in the production of

Hydrofluoric Acid Environment, Health and Safety

Hydrofluoric Acid. Hydrofluoric acid (HF) differs from other acids because it readily penetrates the skin and dissociates into fluoride ions, causing destruction of deep tissue layers, including bone. Pain associated with skin exposure to HF may not occur for 1-24 hours. Unless you can rapidly neutralize the HF and bind the fluoride ions

Niobium and Niobium Compounds, High Temperature Materials

Jan 01, 1993 INTRODUCTION 1. PROPERTIES A. Physical Properties Î . Cold-Worked Niobium C. Chemical Properties 2. OCCURRENCE 3. PROCESSING OF NIOBIUM ORES A. Winning of Pyrochlore Concentrates Î . Treatment of Pyrochlore Concentrates C. Production of Niobium Oxide from Columbites and Tantalites Extraction Processes D. Chlorination 4. N I O B I U M C O M P O U N D S A. O x i d e

Are lead-free piezoelectrics more environmentally friendly

Feb 16, 2017 Typically, the ore is crushed and milled and subjected to flotation to form a pyrochlore concentrate. The concentrate, which include acid-leaching (e.g., hydrochloric acid, sulfuric acid and hydrofluoric acid) and solvent extraction are treated to form niobium oxide, which is further processed to obtain the targeted form of niobium.

1 L.D. Cunningham, Columbium (Niobium) and Tantalum

The concentrate or slag is digested with aqueous hydrofluoric acid (sometimes in conjunction with sulfuric acid) to form fluoride salts of the metals. Unreacted concentrate or slag (gangue) is removed by settling and decantation and is disposed of as a low level radioactive waste. This leaching process also

Extraction of Niobium from Tin Slag

pyrochlore associated and from degradated products of minerals sulfuric acid at 50oC but well above 175oC the concentrated acid dissolves the metal completely. The attack on this metal by hydrofluoric acid is to be used. A process is claimed whereby

TANTALUM, COLUMBIUM, AND FERROCOLUMBIUM

The concentrate or slag is digested with aqueous hydrofluoric acid (sometimes in conjunction with sulfuric acid) to form fluoride salts of the metals. Unreacted concentrate or slag (gangue) is removed by settling and decantation and is disposed of as a low level radioactive waste. This leaching process also generates an acid mist

The composition, chemical properties, and processing of

Jan 30, 2019 A process for acid leaching of the REM for the purpose of simultaneous recovery of a niobium–titanium concentrate has been tested. For this, the ore was ground in a ball mill and leached with 5 M nitric acid and, for comparison, with 5 M hydrochloric acid at temperatures up to 200 °C and a solid–liquid ratio of 1:5 (autoclave conditions).

Caustic fusion of columbite-tantalite concentrates with

Diluted sulfuric acid (1:1) and iron powder are added to aid in dissolving the manganese; then more water is added to bring the sulfuric acid to about 1 molar. The insoluble residue which contains the niobic and tantalic acids is recovered by filtration. It is washed and then dried at

Niobium Plansee

Another important source of niobium is pyrochlore, a calcium niobate with a complex structure. Deposits of this ore can be found in Australia, Brazil and some African countries. The mined ores are refined over a number of different steps to obtain concentrates of up to 70 % (Ta,Nb)2O5. These are then dissolved in hydrofluoric and sulfuric acid.

A Review of Niobium-Tantalum Separation in Hydrometallurgy

obtained. The first step in the processing is the reaction of the oxides with hydrofluoric acid [10]: Ta2O5 + 14 HF → 2 H2[TaF7] + 5 H2O (1) Nb2O5 + 10 HF → 2 H2[NbOF5] + 3 H2O (2) The first industrial scale separation, developed by de Marignac, used the difference in solubility

Are lead-free piezoelectrics more environmentally friendly

Feb 16, 2017 Typically, the ore is crushed and milled and subjected to flotation to form a pyrochlore concentrate. The concentrate, which include acid-leaching (e.g., hydrochloric acid, sulfuric acid and hydrofluoric acid) and solvent extraction are treated to form niobium oxide, which is further processed to obtain the targeted form of niobium.

A Fundamental Economic Factor In The Rare Earth Space: Acid

Dec 02, 2014 pH modification and pyrochlore activator in flotation mineralogy leading to difficult mineral processing, the acid consumption of a typical silicate such as sulphuric and hydrofluoric

Can Hydrofluoric Acid Disintegrate Bone ThoughtCo

Jun 30, 2019 Hydrofluoric acid attacks the silicon oxide in most types of glass. It also dissolves many metals (not nickel or its alloys, gold, platinum, or silver), and most plastics. Fluorocarbons such as Teflon (TFE and FEP), chlorosulfonated polyethylene, natural rubber, and neoprene all are resistant to hydrofluoric acid.

JMMCE20110300002_16331732.pdf Journal of Minerals

View Notes JMMCE20110300002_16331732.pdf from METALLURGY 1-10 at Catholic University of the North, Coquimbo. Journal of Minerals & Materials Characterization & Engineering, Vol. 10, No.3,

Hydroflouric acid Sigma-Aldrich

hydrofluoric acid. Support Customer Support Contact Us FAQ Safety Data Sheets (SDS) Certificates (COA/COO) Quality & Regulatory Calculators & Apps Webinars. Orders Quick Order Custom Products Commerce Solutions. Company About Us Responsibility Events Press Releases Programs Careers Offices. Social Media. MilliporeSigma.

(PDF) A Review of Niobium-Tantalum Separation in

The first step in the processing is the reaction of the oxides with hydrofluoric acid [10]: Ta2O5 + 14 HF → 2 H2[TaF7] + 5 H2O (1) Nb2O5 + 10 HF → 2 H2[NbOF5] + 3 H2O (2) The first industrial scale separation, developed by de Marignac, used the difference in solubility between the complex niobium and tantalum fluorides, dipotassium

EXPERIMENTAL AND STATISTICAL STUDY MUHAMMAD

tani ore took us closer to the process selection [6-9]. Toromanoff and Habashi [10] have worked on niobium oxide production from pyrochlore concen-trates by using 10 M HCl at 200 °C in a pressure reactor for 4 h. Yang et al. demonstrated over 98% leaching of niobium with sulphuric acid under pres-sure using oxygen [11]. These processes mainly used