Sulfuric acid leaching kinetics of South African chromite ...

10%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.

Leaching With Caustic Of The Chromite Plant

Caustic Leaching Of Montana Chromite Core. Oct 20 2020 The leaching kinetics study indicated that the leaching process of chromium was controlled by the surface chemical reaction between the chromite ore processing residue and sulfuric acid Overall the direct acidic leaching process could not achieve high leaching efficiency and resulting in a large amount …

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 °C.

OPTIMIZATION OF CONDITIONS IN SULFURIC ACID …

94.1 % under the conditions of 175 °C, 6 hours and 84.6 wt % sulfuric acid. The maximum extraction of chromium in the presence of perchloric acid was 98.7 % under the conditions of 175 °C, 2 hours, 84.6 wt % sulfuric acid and ½ perchloric acid / chromite ratio. The latter one was also the highest recovery value obtained

Sulfuric acid leaching of Turkish chromite concentrate ...

Leaching of chromite in sulfuric acid with the addition of perchloric acid Due to the low recoveries obtained with the use of sulfuric acid only, perchloric acid additions were made to the sulfuric acid. Table 1 shows that the extraction of chromium increases in the presence of perchloric acid.

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

DOI: 10.1016/J.MINPRO.2014.05.009 Corpus ID: 97761639; Sulfuric acid leaching of South African chromite. Part 2: optimization of leaching conditions @article{Jiang2014SulfuricAL, title={Sulfuric acid leaching of South African chromite.

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

Sulfuric acid leaching of Turkish chromite concentrate ...

In this research work the sulfuric acid leaching of a typical Turkish chromite concentrate was studied. The following was concluded considering the experimental results: 1. In the absence of perchloric acid, the maximum chromium extraction was about 58% under the conditions of 175 °C, 70 vol% H 2 SO 4 (81.4 wt.%) and 2 h.

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 ...

Decomposition mechanism of chromite in sulfuric acid ...

10%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 …

leaching-1.doc - PROJECT REPORT MAY 2011 UNDERGROUND ...

Some of the major problems of-situ leaching are the block age of the well and the loss of permeability of the ore body due to the precipitation of insoluble compounds. For example, during in-situ leaching of uranium ore with sulfuric acid the precipitation of calcium sulfate can result in a significant drop in the permeability of the ore. In ...

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Sulfuric Acid Leaching of Bangka Indonesia Ilmenite Ore and Ilmenite Decomposed by NaOH Sulfuric Acid Attack on Ordinary Portland Cement and Geopolymer Material Sulfuretin isolated from heartwood of Rhus verniciflua inhibits LPS-induced inducible nitric oxide synthase, cyclooxygenase-2, and pro-inflammatory cytokines expression via the down ...

Decomposition mechanism of chromite in sulfuric acid ...

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 …

(PDF) Sulfuric acid leaching of Turkish chromite concentrate

The optimum process conditions of leaching treatment were found to be a temperature of 176 °C, a dichromic acid/chromite mass ratio of 0.12, and a …

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 …

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

DOI: 10.1016/J.MINPRO.2014.04.002 Corpus ID: 94880981; Sulfuric acid leaching of South African chromite. Part 1: Study on leaching behavior @article{Zhao2014SulfuricAL, title={Sulfuric acid leaching of South African chromite.

OPTIMIZATION OF CONDITIONS IN SULFURIC ACID …

In this study, only trivalent chromium remained in the leach solution and did not change to hexavalent state. Obtained product after leaching was chromium(III) sulfate. v The maximum extraction of chromium in the absence of perchloric acid was 94.1 % under the conditions of 175 °C, 6 hours and 84.6 wt % sulfuric acid.

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 °C.The results indicated that magnesium and aluminum were leached out together from the silicate phase and porous amorphous silica was produced as a product layer, while the spinel phase gradually …

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

Zhao Q, Liu C, Shi P, Zhang B, Jiang M, Zhang Q et al. Sulfuric acid leaching of South African chromite. Part 1: Study on leaching behavior . International Journal of Mineral Processing . 2014;130:95–101.

(PDF) Sulfuric acid leaching of Turkish chromite concentrate

The feasibility of the sulfuric acid leaching process on treating low Fe (II)-chromite has yet to be further evaluated, and the effect of the dichromic acid is still unclear. ... ... It was noted...

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 °C.