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Minerals | Free Full-Text | Hydrometallurgical Process and ...

The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO3 and MnO2 was also investigated. The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total Mn (TMn), MnO2 and MnCO3 leaching ...

Acid leaching decarbonization and following pressure ...

Carbonate decomposition of carbonic refractory gold ore and the following pressure oxidation were studied. In the carbonate decomposition procedure, the effects of liquid-to-solid ratio and reaction time on decomposition ratio of carbonate were investigated. The experimental result shows that the decomposition ratio of carbonate is 98.24% under the conditions of liquid-to-solid ratio of 5:1 ...

Heap Leaching Oxide and Sulfide Copper Ores

Presence of Ferric Iron in the Leaching Solvent – Ferric sulfate was found to be essential for oxidizing sulfide minerals and, when used in conjunction with acid on the oxide minerals, was found to substitute for acid and thereby reduce the ultimate consumption of acid. A good example of the use of ferric sulfate as a substitute for acid is ...

OVERVIEW OF GANGUE MINERALOGY ISSUES IN OXIDE …

involving silicate and limonite gangue minerals, which can be potential major sources of acid consumption and can readily be overlooked in comparison to more obvious sources of acid consumption such as carbonates. The review is intended to serve as a refresher on the role of ore and gangue minerals in leaching and to encourage greater attention to

Figure 1 from Alkaline leaching of brannerite. Part 1 ...

Some uranium ores contain large amounts of acid-soluble gangue, such as carbonates or soluble silicates and when the carbonate content exceeds approximately 8%, the acid consumption by gangue may render acid leaching uneconomical. In these situations, leaching in alkaline… Expand

Purification and Removal of Hematite from Talc by Acid ...

Also, acid leaching of talc ores for the exclusion of gangue minerals is an effective practice that involves the use of different acids such as HF, HCl, and H 2 SO 4 [13,14,15,16,17]. Because of its effectiveness and economic feasibility, acid leaching is a potentially attractive process for the purification of talc ores [ 17 ].

Dissolution kinetics of hemimorphite in methane sulfonic acid

to leach Zn. However, for the low-grade zinc ores containing high -bearing and carbonate minerals Fe contents, the use of sulfuric acid will result in high acid consumption, poor leaching, and complex purification process (Mahdi et al., 2013; Zhao et al., 2000). Xu et al. (2012) used sulfuric acid to leach

Dissolution Kinetics of Malachite in Sulphuric Acid ...

Malachite ores usually contain some gangue minerals, such as calcite, dolomite, and Fe 2 O 3, which can consume H 2 SO 4 during the acid leaching process according to Eqs.

CN102515279A - Comprehensive extraction method of ferro ...

CN102515279A CN2011104108153A CN201110410815A CN102515279A CN 102515279 A CN102515279 A CN 102515279A CN 2011104108153 A CN2011104108153 A CN 2011104108153A CN ...

Morphological Variations During Carbonate Leaching of ...

The dissimilar leaching behavior of Tummalapalle and Gogi uranium ores in carbonate media could be attributed to the nature of uranium mineralization and the association of uranium values with pyrite, a reactive gangue mineral, present in the ores. Leaching efficiencies and morphological changes observed were corroborated.

SciELO - Brasil - LEACHING OF MALACHITE ORE IN AMMONIUM ...

In addition, the gangue minerals existent in the ore matrix can cause high consumption of acid. For these reasons, the use of weakly acidic or basic lixiviants can be more favorable in the leaching step of the hydrometallurgical processing of malachite ore ( Oudenne and Olson, 1983 Oudenne, P. D., Olson, F. A., Leaching kinetics of malachite in ...

Effect of Hydrochloric Acid on Leaching Behavior of ...

to reduce/eliminate carbonate content by leaching the ground phosphate rock with dilute hydrochloric acid solution. Effects of hydrochloric acid concentration, reaction time, temperature and liquid/solid ratio (vol./wt. basis) on the process have been studied. Under the reaction

Changes in electrode potential in the non-oxidative ...

Acidic non-oxidative leaching of the copper shale fraction is based on the chemi-cal reactions of sulfuric acid with calcium and magnesium carbonates. The carbonate minerals are the main component of the hydrophilic gangue which forms intergrowths and impregnations with copper sulfides or creates hydrophilic ultra-fine slimes on the

WO2016011540A1 - Acid leaching of rare earth elements ...

The invention provides hydrometallurgical processes for the recovery of rare earth values from ore, using simple crushing without beneficiation to produce an enriched and purified mixed rare earth concentrate. Ore is crushed to a relatively coarse particle size, and then treated with relatively small amounts of acid, at a relatively modest elevated temperature, to render the rare earth ...

Hydrochloric acid leaching for upgrading flotation ...

improved using hydrochloric acid leaching to dissolve the carbonate minerals in the concentrate. The effects of three dominant parameters on the leaching performance, that is the leaching time, leaching temperature and hydrochloric acid concentration were investigated, and then a flotation-leaching process was proposed for processing of the

PRE-FLOTATION LEACHING OF POLISH CARBONATE …

ferous minerals, particularly in the carbonate type ore, considerably reduces the susceptibility to ef-fective liberation. A beneficial effect of non-oxidative leaching of carbonate gangue with sulfuric acid on copper ore flotation was presented in the paper. It was shown that the non-oxidative leaching of

A review of the beneficiation of calcareous phosphate ores ...

Overall, there do not appear to be any clear differences in organic acid capability, acidic properties and advantages in leaching carbonate minerals. However, from the separation perspective of the leachate and phosphate concentrate, soluble acids are better than succinic acid and cause less corrosion effects. 4.2. Acid concentration

Uranium - MinAssist

The host material is high in calcite, an acid consuming mineral, and pyrite, a carbonate consuming mineral, making both conventional acid tank leaching and alkaline leaching uneconomic. MinAssist undertook extensive mineralogical characterisation, determining the deportment and grain size of both the uranium host matrix and gangue minerals.

Leaching and solvent extraction purification of zinc from ...

Main gangue minerals were quartz, goethite, hematite, and calcite. Central composite design (CCD) method was used to design leaching experiments and the optimum conditions were found as follows: 30% of solid fraction, 22.05% sulphuric acid concentration, and the leaching temperature of 45 °C.

US4155982A - In situ carbonate leaching and recovery of ...

Uranium ore deposits which contain certain proportions of other metals and elemental components, such as are present in redox roll front ore deposits, are selectively leached in situ by passing therethrough relatively dilute aqueous leach solutions comprising essentially from about 0.5 to 5 grams per liter of ammonium bicarbonate and from about 0.1 to 3 grams per liter of peroxide, preferably ...

Selective leaching kinetics of low-grade calcareous ...

In this study, leaching with acetic acid was applied to remove as much carbonate gangue from ore as possible to achieve a suitable concentrate and increase its P 2 O 5 content to an acceptable level. The objectives of this study were to investigate the main factors involved in the leaching such as reaction time, acid concentration, pulp density ...

Effects Of Acid Leaching Of Carbonate Gangue Minerals

Leaching effects of the uranium minerals and reactive gangue material were investigated by comparing the mineralogical characteristics between pre and postleach samples A simple example of applying the knowledge of mineralogy to the selection of leaching process is the choice of carbonate leachate over acid …

Uranium Extraction from Tailings by Dilute Alkali ...

The results showed that the leaching efficiency of dilute alkali pretreatment–sulfuric acid leaching is superior to direct acid leaching. Only 13 ppm and 7.5 ppm of uranium remained in tailings by using NaOH and Na 2 CO 3, respectively, with an alkali concentration of 10 g/L, a liquid-to-solid ratio of 20, and an agitation of 400 rpm for 2 h.

Uranium Mining Impact | PDF | Mining | Gamma Ray

The effects of acid drainage are discussed in the following section. ... The presence of sulphate or carbonate minerals is of particular concern. ... Leaching rates from the tailing were calculated by balance method for 1996 to 1998 to be 70 to 100 m3 /year.

Effect of solid to liquid ratio (w/v) on the recovery of ...

The main challenges associated with carbonate-rich mixed ores are the low recovery of cobalt, mostly due to cobalt present in oxide minerals, the floatability of the carbonate gangue minerals ...

Silicate, phosphate and carbonate mineral dissolution ...

Formic and acetic acids have the tendency to attack the phosphate minerals (poor selectivity for carbonate) and can corrode equipment. Less corrosive effects and risk of phosphate mineral dissolution were achieved by lactic acid. Leaching is less effective at high organic concentrations due to the polarity of the O-H bond

(PDF) A review of the beneficiation of calcareous ...

A review of the beneficiation of calcareous phosphate ores using organic acid leaching. Download. Related Papers. Phosphate Rock Treatment with Hydrochloric Acid for Increasing P 2 O 5 Content. By balaji sembu kuppusamy and Haider Al-Rubaye, Ph.D.

US8871001B2 - Method for leaching zinc from a zinc ore ...

A method for leaching zinc from a zinc-bearing carbonate ore, the method comprising the steps of: subjecting the zinc-bearing carbonate ore to elevated temperatures of between about 300° C. and about 900° C. thereby producing a roasted ore; subjecting the roasted ore to an aqueous acid or alkali leach thereby producing an aqueous zinc solution; and subjecting the aqueous zinc solution to a ...

Minerals Engineering International Online - Commodities ...

B.J. Youlton, J.A. Kinnaird, Gangue–reagent interactions during acid leaching of uranium, Minerals Engineering, Vol. 52, 2013 A.M. Candela, V. Benatti, C. Palet, Pre-concentration of Uranium (VI) using bulk liquid and supported liquid membrane systems optimized containing bis(2-ethylhexyl) phosphoric acid as carrier in low concentrations ...

Understanding Acid Consumption and Its Relationship with ...

Acid consumption in copper heap leaching is determined by the minerals present in the ore. Gangue minerals such as biotite and chlorite consume acid together with copper-bearing minerals such as chrysocolla and malachite. Acid consumption is affected by the rate of acid application and the particle size. Some gangue minerals undergo