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Production of synthetic rutile

Production of synthetic rutile

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Nov 02, 1992 · 36. A process according to claim 33, wherein the acid is sulfuric acid at a concentration of about 5% by weight. 37. A process according to claim 25, wherein the acid treatment comprises sequential leaching steps, including a leaching step with hydrochloric acid, and a leaching step with sulfuric acid. 38.

Recovery of water and acid from leach solutions using ...

Recovery of water and acid from leach solutions using ...

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This paper describes for the first time the use of direct contact membrane distillation (DCMD) for acid and water recovery from a real leach solution generated by a hydrometallurgical plant. The leach solutions considered contained H2SO4 or HCl. In all tests the temperature of the feed solution was .

EPA2

EPA2

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A process is provided for heap leaching ore to recover nickel. The process is particularly effective for ores that have a tangible clay component (, greater than 10 % by weight). The process includes sizing the ore (where necessary), forming pellets by contacting ore with a concentrated sulfuric acid lixiviant and agglomerating. The pellets are formed into a heap and leached with a ...

wet chemical analysis of silica in chromite ore

wet chemical analysis of silica in chromite ore

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The sulfuric acid leaching processes with different temperature were systematically studied by . Chat Online; Chromite (Cr2FeO4) CrFeO4PubChem. Since silica sand is common and inexpensive it is the most commonly used mineral. Imported chromite ore was consumed by one chemical firm to produce chromium Mine dust was the prime cause of the ...

Leaching of valuable elements from thermal power plant ...

Leaching of valuable elements from thermal power plant ...

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Leaching was performed with 20, 30 and 40 wt% sulphuric acid, respectively, in an autoclave at 100(o)C, 120(o)C and 140(o)C for 120, 240, 360 and 480 min, at a constant value of the liquid/solid ratio. After autoclaving, the samples (suspensions) were diluted with a constant value of water and stirring at 50(o)C for 60 min.

Advanced Materials Research Vols. 361363 | p. 12 ...

Advanced Materials Research Vols. 361363 | p. 12 ...

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Abstract: Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of atmospheric pressure and the addition of oxidant A. And the leaching rate of chromium and iron would be % and %, respectively.

(Bio)leaching Behavior of Chromite Tailings

(Bio)leaching Behavior of Chromite Tailings

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In order to rule out chromite as a source of dissolved Cr, a leaching experiment with concentrated ore (product after the beneficiation plant) at pH 2, and a pulp density of 30 g/L, was performed . The results show three fold less Cr in the leachate of the concentrated ore sample (47 mg/kg) compared with the leachate of the fresh tailing sample ...

Chromium

Chromium

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Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group is a steelygrey, lustrous, hard, and brittle transition metal. Chromium is the main additive in stainless steel, to which it adds anticorrosive is also highly valued as a metal that is able to be highly polished while resisting tarnishing.

Novel Approach for Enhanced Scandium and Titanium Leaching ...

Novel Approach for Enhanced Scandium and Titanium Leaching ...

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Apr 04, 2018 · While sulfuric acid was determined as the best candidate for direct acid leaching of both metals, the need of pretreatment, low solidtoliquid ratio, high acid concentration and consumption, and ...

Study on mechanisms of different ...

Study on mechanisms of different ...

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The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing agent. The results show that the main phases in ...

Chromic acid

Chromic acid

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The term chromic acid is usually used for a mixture made by adding concentrated sulfuric acid to a dichromate, which may contain a variety of compounds, including solid chromium kind of chromic acid may be used as a cleaning mixture for glass. Chromic acid may also refer to the molecular species, H 2 CrO 4 of which the trioxide is the anhydride.

USA1

USA1

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A method for recovering chromite from ore slurry obtained by processing nickel oxide ore, the raw material, in a plant for the wet smelting of nickel oxide ore. In the method chromite is separated and recovered from an ore slurry obtained from a nickel oxide ore when nickel and cobalt are recovered from the nickel oxide ore. The method has a grain diameter separation step for separating the ...

Modeling Chromium Dissolution and Leaching from Chromite ...

Modeling Chromium Dissolution and Leaching from Chromite ...

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Dec 30, 2005 · Therefore, knowledge of migration behavior and leaching rates of chromium through waste materials are of primary concern for environmentally sound management of hazardous wastes. Leaching rates of total Cr and Cr(VI) were studied experimentally using laboratory columns packed with COPR material produced by a sodium chromite plant.

Pyanodons Mods Tutorials – Chromium Chain

Pyanodons Mods Tutorials – Chromium Chain

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Hello everyone, and welcome to Pyanodons mods. This is OtakuShowboat, and in this tutorial, we'll be going over the chromium ore processing chain as well as my thoughts on obtaining the outside resources required in the more advanced sections of the chain. Below is the companion video tutorial video. If you enjoy the video, please . Pyanodons Mods Tutorials – Chromium .

Gravimetric Silica in Mineral Chromite and Ferrochrome Slags

Gravimetric Silica in Mineral Chromite and Ferrochrome Slags

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Oct 18, 2017 · A high aluminum concentration tends to slow the reaction. A slow leach reaction may become a very fast leach reaction when sulfuric acid is added, so care must be exercised. Once the leach reaction has finished, the addition of sulfuric acid is generally accompanied by moderate effervescence unless a significant amount of carbonate is present.

Magnesiumphosphate compound fertiliser and production ...

Magnesiumphosphate compound fertiliser and production ...

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During the decomposition of the raw materials with sulfuric acid is the leaching of metal ions: potassium, magnesium, iron, and the formation of colloidal silicic acid After dissolution of cementing ligament chromite grain is separated, that eliminates the ingress of fertilizer chromium oxide.

chromite processing plant regulations

chromite processing plant regulations

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May 19, 2020To avoid the transformation from Cr(III) into Cr(VI) in the chromite processing, sulfuric acid leaching has been proposed and extensively studied [26–29]. In this process, Cr(III) is extracted from the chromite in a heated sulfuric acid solution with the help of recovered dichromic acid, Get Price

Minerals | Free FullText | Cleaner Production of ...

Minerals | Free FullText | Cleaner Production of ...

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Sulfuric acidbased leaching is a promising cleaner method to produce chromium salts, but its feasibility for treating low Fe(II)chromite still remains to be proven. A Box–Behnken design (BBD)based set of experiments for sulfuric acid leaching of low Fe(II)chromite was utilized in this work for generating an experimental dataset for revealing the functional relationships .

Acid leaching of chromite

Acid leaching of chromite

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May 01, 1994 · The reaction between chromite and sulphuric acid was studied in the temperature range 140 210oc. The leaching time varied from 2 to 6 hours and the sulphuric acid concentration from 60 to 90 percent by weight. A solid liquid ratio of 1:25 and particle size of 90 +75 Itm was kept constant in all experiments.

Leaching Process For Chromite

Leaching Process For Chromite

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Experimental Study on Sulfuric Acid Leaching Behavior of ... Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of ...

[PDF] Hot Filtration: A Way to Enhance the Recovery of ...

[PDF] Hot Filtration: A Way to Enhance the Recovery of ...

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A high grade chromite concentrate obtained from the Pinarbasi region of Kayseri province in Turkey was reacted with a solution of sulfuric acid and perchloric acid at atmospheric pressure. The effects of temperature, duration, sulfuric acid concentration and perchloric acid addition on leach recovery were determined in several experiments.

In situ leach

In situ leach

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Insitu leaching of copper was done by the Chinese by 977 AD, and perhaps as early as 177 BC. Copper is usually leached using acid (sulfuric acid or hydrochloric acid), then recovered from solution by solvent extraction electrowinning (SXEW) or by chemical most amenable to leaching include the copper carbonates malachite and azurite, the oxide tenorite, and the silie ...

acid leaching with hcl

acid leaching with hcl

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Two leaching agents were used, are 6 M sulfuric acid (H 2 SO 4) or hydrochloric acid (HCl). 10 g of calcined kaolin was added to 100 ml of the 6 M leaching agent in a 250 mL round flask with condenser previously heated at 90°C (slurry density is 10 g per 100 ml of the leaching agent) and the slurry was stirred at 500 rpm for 3 hours.