chromate in depressing sulfide minerals

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Influence of soil minerals on chromium(VI) reduction by ...

The effects of soil minerals on chromate (CrVIO42-, noted as Cr(VI)) reduction by sulfide were investigated in the pH range of 7.67 to 9.07 under the anoxic condition. The examined minerals included montmorillonite (Swy-2), illite (IMt-2), kaolinite (KGa-2), aluminum oxide (γ-Al2O3), titanium oxide (TiO2, P-25, primarily anatase), and silica (SiO2).

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Mineral Gallery - the Subclasses of the Sulfates Class

The Sulfate subclasses include many exotic minerals with only a few minerals that are familiar even to most collectors. The basic chemical unit is the (AO4) complex anion with a charge of negative two (-2).The selenites and tellurites (notice the spelling) have a basic unit of (AO3).There are also some members of these subclasses with a basic anion unit of (AO6) The A can be either chromium ...

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Flotation Behavior of Complex Sulfide Ores in the Presence ...

Jan 01, 2017· In sulfide mineral flotation, Polymers have been used as potential candidates to replace hazardous reagents. Polyacrylamide polymers (PAMs) with different functional groups exhibited depressing ability for ferrous sulfide minerals such as pyrite [4]. Recently a biodegradable polymer chitosan has also shown a promising depressing ability for ...

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carbonate depression in flotation - Jack Higgins

Determination of the appropriate depressing reagents for sinking valuable minerals in the presence of collectors for carbonates is a cardinal stage in obtaining an efficient separation in the direct flotation of Mg carbonate . One of the essential challenges during flotation in the presence of Mg carbonate is the occurrence of slimes. Read More

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Chromate mineral | Britannica

Chromate mineral, any member of a small group of rare inorganic compounds that have formed from the oxidation of copper-iron-lead sulfide ores containing minor amounts of chromium.A noteworthy occurrence is at Dundas, Tasmania, known for its large, brilliant orange prismatic crystals of crocoite; of trivial economic importance, crocoite is one of the most highly prized of minerals among ...

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Pyrite Depression By Reduction Of Solution Oxidation Potential

The mechanisms for depression of sulfide minerals have remained obscure, because the mechanisms for flotation have been obscure. This is evidenced by the number of theories proposed to explain the flotation mechanisms Gaudin proposed that the adsorption of xanthate on sulfide minerals was the result of an ion 1 2 exchange mechanism.

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The Classification of Mineral Species - Max Planck Society

Melanterite is an iron ore which is formed by the oxidation and hydrothermal alteration of pyrite (FeS 2) or other iron sulfide minerals. This species is yellow green to deep green due to the presence of iron. 10. Chromates Top Photos. Minerals of the chromate class are compounds of metallic cations with the chromate anion group (CrO 4) 2-. The ...

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Sulfate mineral - Wikipedia

The sulfate minerals are a class of minerals that include the sulfate ion (SO 4 2−) within their structure.The sulfate minerals occur commonly in primary evaporite depositional environments, as gangue minerals in hydrothermal veins and as secondary minerals in the oxidizing zone of sulfide mineral deposits. The chromate and manganate minerals have a similar structure and are often …

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REVISITING SULPHIDE MINERAL FLOTATION: A FEW …

chromate, etc.)? How does introduction of S2 ... concerns that bad selectivity for non-ferrous sulfide minerals against pyrite presents, there has ... of sulfide minerals. The depressing effect generally increases from copper sulfides to galena, ...

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DEXTRINS AS SELECTIVE FLOTATION DEPRESSANTS FOR …

Dextrins as selective flotation depressants for sulfide minerals 277 depressing power towards copper minerals because the reduction of flotation of copper minerals is greater than towards the lead minerals. Still greater amount of dextrin N-8 depresses flotation of sulfides in …

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Influence of soil minerals on chromium(VI) reduction by ...

Apr 12, 2007· The effects of soil minerals on chromate (CrVIO42-, noted as Cr(VI)) reduction by sulfide were investigated in the pH range of 7.67 to 9.07 under the anoxic condition. The examined minerals included montmorillonite (Swy-2), illite (IMt-2), kaolinite (KGa-2), aluminum oxide (gamma-Al2O3), titanium oxide (TiO2, P-25, primarily anatase), and ...

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Reduction of Hexavalent Chromium by Amorphous Iron Sulfide ...

The reduction of Cr(VI) to Cr(III) decreases the toxicity and mobility of chromium contaminants in soils and water. In addition, the formation of a highly insoluble Cr(III) product would decrease the likelihood of future Cr(III) re-oxidation. Amorphous iron sulfide minerals like mackinawite (FeS1-x) have the potential to reduce large quantities of Cr(VI) and in the process form very stable [Cr ...

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chromate in depressing sulfide minerals

chromate in depressing sulfide minerals - anreximin. Lead chromate, PbCrO 4, is also used as a pigment under the name chrome yellow, Lead is found in the mineral nagyagite, a sulfide, along with gold, iron. 【Live Chat】 DEXTRINS AS SELECTIVE FLOTATION. Dextrins as selective flotation depressants for sulfide minerals 277 depressing power ...

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Amazon Best Sellers: Best Chromium Mineral Supplements

Vitamins and Minerals. Chromium, Magnesium, Biotin, Zinc, Calcium, Green Tea. Antioxidant Properties for Women. Heart, Breast Health. 60 Capsules 4.4 out of 5 stars 3,247. $19.97 - $39.97 #2. Best Naturals Chromium Picolinate 1000 mcg 120 Tablets 4.5 out of 5 stars 1,276. $11.79 ...

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Chrome Yellow Primrose Pigment - Dry ... - Natural Pigments

WARNING! CONTAINS LEAD. Please read the MSDS for more information. Chrome Yellow Primrose is a chromate of lead, and is similar to the lead salt PbCrO 4 that occurs naturally as the mineral crocoite. It is obtained synthetically as a yellow crystalline powder by precipitation from a solution of a lead salt (such as lead nitrate) and sodium chromate or sodium dichromate, and is used as a ...

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Two-liquid flotation of sulphides: An electrochemical ...

It has been shown that selective depression of the flotation of sulfide minerals by cyanide is achieved through the one or more of the following processes: 1.(A) cyanide dissolves the metal ...

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EP0830208A1 - Method of depressing non-sulfide silicate ...

A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is either (1) a polymeric material comprising recurring units of the formula: -[-X-]-x -[-Y-]-y -[-Z-]-z wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x ...

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FROTH FLOTATION : RECENT TRENDS Flotation of Sulphide …

1. Intricate mineralogy of various minerals in. close association with each other and gangue minerals. 2. Very fine dissemination of ore minerals in matrix. 3. Occurrence of oxide and oxidised minerals. 4. Excessive presence pyrite and pyrrhotite. 5. Presence of naturally floatable gangue minerals like talc, graphite, mica etc. 6.

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chromate in depressing sulfide minerals - Heledirn

chromate in depressing sulfide minerals. ... To elucidate the mechanisms of sulfide mineral depression, the U.S. Bureau of Mines examined the depressant effect of hydrosulfide on flotation of copper sulfides, using electrochemical techniques and flotation tests. Hydrosulfide addition is …

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Inorganic Depressants for Sulfide Minerals | Reagents in ...

It is generally accepted that oxidation/reduction reactions are important in flotation separation of sulfide minerals with sulfhydral collectors. Several investigators have demonstrated that reducing conditions lead to depression of sulfide minerals. Strong oxidizing conditions also lead to the depression of sulfide minerals.

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Flotation separation of carbonate from sulfide minerals ...

Flotation separation of carbonate from sulfide minerals, II: Mechanisms of flotation depression of sulfide minerals by thioglycollic acid and citric acid Article in Minerals Engineering 17(7-8 ...

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