leaching with sulfuric acid of the chromite plant

Sulfuric acid leaching of Turkish chromite concentrate ...

Nov 01, 2002  In this research work the sulfuric acid leaching of a typical Turkish chromite concentrate was studied. The following was concluded considering the experimental

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Sulfuric acid leaching of South African chromite. Part 2 ...

Jul 10, 2014  The initial results of the investigation of sulfuric acid leaching of South African chromite are reported in part 1 of this study (Zhao et al., 2014). Results

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Sulfuric acid leaching of South African chromite. Part 1 ...

The leaching behavior of chromite by sulfuric acid in the presence of oxidant was studied experimentally in this work, where most tests were carried out at 160

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Sulfuric acid leaching of South African chromite. Part 2 ...

The results also showed that the sulfuric acid concentration and oxidant have a marked influence on the extraction yield of chromium and on the leaching reaction

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Sulfuric acid leaching kinetics of South African chromite ...

Mar 04, 2015  高达10%返现  The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and

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CN101979679A - Method for treating chromite by sulfuric ...

The invention discloses a method for treating chromite by sulfuric acid leaching, which comprises the following steps of: grinding the chromite into mineral

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Sulfuric acid leaching kinetics of South African chromite ...

Mar 04, 2015  The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were

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CN101979679A - Method for treating chromite by sulfuric ...

The invention discloses a method for treating chromite by sulfuric acid leaching, which comprises the following steps of: grinding the chromite into mineral powder, adding sulfuric acid into the mineral powder, stirring the mixture, and adding an oxidant into the mixture, wherein the oxidant is chromic anhydride, potassium chlorate or ammonium persulphate, and the adding amount of the oxidant ...

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Sulfuric Acid Leaching of South African Chromite. Part 1 ...

The sulfuric acid leaching behavior of the chromite in Zhao et al.'s study can be illustrated as shown in Figure 3, where four types of spinel, denoted as I, II, III, and IV, represent different ...

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leaching process for chromite

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...

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Caustic Leaching of Montana Chromite

Chromite Solvent: 8 parts of 95 per cent sulfuric acid and 3 parts of 85 per cent phosphoric acid. Oxidation Solution: 2 parts of 72 per cent perchloric acid and 1 part of distilled. water. Standard Solutions: 0.05 N. ferrous sulfate and .10 N. ceric sulfate. Indicator: 0.025 1. solution of Ferroin. Other Materials: Finely Bround crystals of

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leaching process for chromite - capeatlanticdistrictumw.org

Another cleaner process beyond the proof of concept stage for processing chromite and other refractory ores (Bayca 2013 Li et al. 2008) is the acid leaching process. It shows that chromite dissolves in concentrated sulfuric acid below 200 °C in the presence of oxidant without generating any chromium (VI)bearing substance .

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Acid Leaching - Copper Ore Treatment Method

May 23, 2017  The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment. The flowsheet contemplates a six to seven day leach-wash cycle with ...

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(Bio)leaching Behavior of Chromite Tailings

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 ...

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Leaching kinetics of acid-soluble Cr(VI) from chromite ore ...

Apr 26, 2011  Leaching kinetics of acid-soluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigated for potential remediation of COPR with industrial waste water containing HF. The results show that HF can effectively destabilize the Cr(VI)-bearing minerals, resulting in the mobilization of Cr(VI) from COPR into the leachate. Particle ...

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leaching process in south africa

Sulfuric acid leaching kinetics of South African chromite ... The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase ... Inquire Now; small scale leaching plant in south africa

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leaching with caustic of the chromite plant

leaching with caustic of the chromite plant. leaching process for chromite. Leaching of Valuable Elements from the Waste Chromite Ore from the calcium roasting process is the residue of water leaching after mixing chromite sodium carbonate (Na 2 CO 3) and dolomite and calcining at high temperatures.15 This residue contains a large amount of calcium and a small amount of iron

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(PDF) Atmospheric acid leaching of nickel laterites review ...

This review examines the atmospheric leaching (AL) of nickel laterite ores with sulphuric acid, specifically the limonite, smectite (clay) and saprolite fractions. The kinetics and mechanism of leaching of the key minerals are reviewed together with

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Leaching Process For Chromite

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 ...

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Optimization of leaching conditions for extraction of ...

Acid concentration, leaching temperature, leaching time, and solid ratio were investigated as leaching parameters and optimized. Maximum magnesium extraction yield was determined to be nearly 98% for both acids under optimum leaching parameters which leaching temperature was 85°C, solid ratio was 20wt.%, leaching time was 120 minutes, and acid ...

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Sulfuric acid leaching kinetics of South African chromite

The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a ...

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Decomposition mechanism of chromite in sulfuric acid ...

Dec 13, 2017  The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg–Al, Mg–Fe, and Mg–Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in ...

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1,2, 1,2 3 - MDPI

May 19, 2020  Abstract: Sulfuric acid-based 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

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Separation of Cr3+ and Fe3+ from sulphuric acid leaching ...

Separation of Cr3+ and Fe3+ from in sulfuric acid leaching solution of chromite with goethite was studied with experiments. The result show that Fe(OH)3 produced by adding appropriate amount of ...

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Total Chromium in Mineral Chromite and Ferrochrome Slags

Oct 18, 2017  When leaching activity has subsided, slide the cover aside slightly and slowly add about 25 mL of 1:1 sulfuric acid solution. Reclose the cover and wait for the completion of any further leaching action. Remove and rinse the cover glass, and rinse down the beaker sides. Place a glass stirring rod in the beaker and stir the contents thoroughly.

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Gravimetric Silica in Mineral Chromite and Ferrochrome Slags

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.

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The Reduction of Chrome in UG-2 Flotation Concentrate by ...

Aug 04, 2021  Sulfuric acid leaching of Turkish chromite concentrate. Minerals Engineering, 15 (11), pp. 885-888. [11] Hay, M. P. and Roy, R., (2010). A case study of optimising UG2 flotation performance. Part 1: Bench, pilot and plant scale factors which influence Cr 2 O 3 entrainment in UG2 flotation. Minerals Engineering, 23 (11), pp. 855-867. [12]

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Optimization of leaching conditions for extraction of ...

Acid concentration, leaching temperature, leaching time, and solid ratio were investigated as leaching parameters and optimized. Maximum magnesium extraction yield was determined to be nearly 98% for both acids under optimum leaching parameters which leaching temperature was 85°C, solid ratio was 20wt.%, leaching time was 120 minutes, and acid ...

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Roasting and Leaching Behavior of Nickel Laterite Ore ...

Mar 29, 2021  Sulfation, Roasting, and Leaching Procedures. For each sample, the addition of sulfuric acid (H 2 SO 4) was in the range from 34 to 68 wt pct and moisture (H 2 O) from 10 to 40 wt pct. The sample was pre-roasted at 265 °C for 60 minutes and roasted in a temperature range from 680 °C to 830 °C with times varying from 5 to 60 minutes.

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Technical Note Characterization of limonitic laterite and ...

Technical Note Characterization of limonitic laterite and solids during sulfuric acid pressure leaching using transmission electron microscopy D. Georgiou a,*, V.G. Papangelakis b a Department of ...

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Leaching kinetics of acid-soluble Cr(VI) from chromite ore ...

Apr 26, 2011  Leaching kinetics of acid-soluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigated for potential remediation of COPR with industrial waste water containing HF. The results show that HF can effectively destabilize the Cr(VI)-bearing minerals, resulting in the mobilization of Cr(VI) from COPR into the leachate. Particle ...

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WO2001075184A2 - Heap leaching of nickel containing ore ...

A process is provided for heap leaching ore to recover nickel. The process is particularly effective for ores that have a tangible clay component (i.e., 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 ...

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(PDF) Atmospheric acid leaching of nickel laterites review ...

This review examines the atmospheric leaching (AL) of nickel laterite ores with sulphuric acid, specifically the limonite, smectite (clay) and saprolite fractions. The kinetics and mechanism of leaching of the key minerals are reviewed together with

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Surface Technology Environmental Resource Center - STERC

All chromic acid produced in this country is made by reacting bichromate of soda with sulfuric acid. Bichromate of soda is the end-product of a process involving chromite ore, soda ash, lime, water and sulfuric acid. The process with improvements in equipment, controls and

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