fects acid leaching carbonate gangue minerals

Mineral Processing Overview | SRK Consulting

The presence of carbonate minerals at levels that result in uneconomically-high acid consumption, for example, would likely favor the selection of alkali leaching. Potential to Pre-Concentrate Screening can be an effective means of pre-concentration where uranium minerals preferentially report to certain size fractions of run-of-mine or primary ...

Recovery of extra-heavy oil and minerals from carbonate ...

Organic acids were always used in acid leaching because of its selectivity and lower corrosivity, espe-cially formic acid and acetic acid.33 Gharabaghi et al. used organic acids including formic acid to reduce the content of gangue minerals such as carbonate in phosphate rocks. It is found that formic acid is the optimal acid for this ore which

Gangue–reagent interactions during acid leaching of ...

Gangue dissolution increases reagent costs, and in some cases can prevent the economic acid leaching of an ore, but can also increase uranium mineral exposure and improve recoveries. Due to rapid dissolution kinetics, the acid consumption characteristics of the various carbonate species are readily predicted, however the same is not true of ...

Metals | Free Full-Text | Gangues and Clays Minerals as ...

The presence of carbonates results in the high consumption of acid in the leaching processes. Among carbonate minerals, calcite is known for its high reactivity in acid, dissolving even in very dilute sulfuric acid conditions. Carbonates, such as chlorite and epidote, can dramatically increase acid consumption when working in long leaching periods.

EPA - Identification and Description of Mineral Processing ...

Lithium Carbonate, Soda Ash, Sodium Sulfate, and Strontium. EXHIBIT 4-1 ... Leach Residue Mineral Processing Refining Dross Mineral Processing ... Fluorspar and Hydrofluoric Acid Gangue Extraction/Beneficiation Lead and Zinc sulfides Extraction/Beneficiation

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 ...

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

Gangue-reagent interactions during acid leaching of uranium

sequences. Gangue dissolution increases reagent costs, and in some cases can prevent the economic acid leaching of an ore, but can also increase uranium mineral exposure and improve recoveries. Due to rapid dissolution kinetics, theacid consumption characteristics of the …

The Effects of Phosphate Gangue on the Leaching of …

The ore contained apatite as a gangue mineral, and phosphate dissolution was 1.6% at most and typically below 1% over 24 hours of leaching in 1 mol/L total carbonate (with a bicarbonate/carbonate ratio ranging from 1 to 4, typically 2) solution between 50 and 90 °C, though this process does have the disadvantage of requiring finer grind sizes ...

Copper Leaching Practices

Heap leaching contrasts with dump leaching principally in that ore material is leached instead of waste material. This method is not applicable to the dissolution of copper sulfide minerals or to ores containing large amounts of carbonate or other acid soluble gangue minerals.

Silicate, phosphate and carbonate mineral dissolution ...

Acetic acid enhances dissolution of calcium carbonate. Gangue minerals have a strong effect in decreasing the carbonate content in the phosphate rock. Acetic acid solution leaches the calcium carbonate without decomposing the phosphate itself. Gharabaghi et al. (2009) Low-grade calcareous phosphate

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

The Effects of Phosphate Gangue on the Leaching of Uranium ...

The ore was leached in sodium carbonate media for 24 h. Leach temperatures of 50, 70 and 90 °C, and sparging with oxygen, air and nitrogen were tested. ... the acid consumption by gangue may ...

Mineralogically-Based Determinations of Neutralization …

Gangue minerals are largely quartz, plagioclase, K-feldspar, muscovite and amphibole (Jamieson, Shaw & Clark, 1995), although other minerals have been documented in the deposit (Petersen, 1986). Carbonate minerals occur only in trace amounts and acid drainage from tailings has been documented (Jamieson, Shaw & Clark, 1995). METHODS

(PDF) The effects of hardpan layers on the water chemistry ...

This acid would have caused the slow dissolution of gangue minerals from the tailings and secondary precipitates from within the hardpan layers, and result in increasing concentrations of aqueous calcium, magnesium, manganese and potassium (Fig. 5).

Gangue–reagent interactions during acid leaching of uranium

A cleaner and efficient extraction of Mn from low-grade Mn ...

However, high acid consumption is a well-known problem encountered in the treatment of Mn carbonate ores by H 2 SO 4 leaching process, resulting from the inevitable dissolution of acid-consuming gangue minerals such as calcite (CaCO 3), dolomite (CaMg(CO 3) 2), and Fe 2 O 3 (He et al., 2016, 2017; Liu et al., 2014; Xie et al., 2013). These ...

An investigation into the leaching behaviour of copper ...

acid during the leaching of such ores, which can make the process un-economical (Habashi, 1970, 1980; You-Cai et al., 2013). Table 1 shows the acid consumption and estimated time to complete the dissolution of major carbonaceous materials in 10 g/L sulfuric acid solutions. It can be seen that for acid leaching, each ton of carbonate mineral (e.g.

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

Hydrochloric acid leaching for upgrading flotation ...

abundant carbonate minerals of dolomite significantly reduces the A/S ratio in the concentrate. As these minerals react with hydrochloric acid (Reddy et al., 1999), the hydrochloric acid leaching of the concentrate was carried out, to improve its Al 2 O 3 grade and A/S ratio.

Dump and Heap Leaching - HydroJex

uranium minerals can be leached with sulfuric acid or in alka-line conditions employing sodium carbonate. More-complex/ less-oxidized uranium minerals require stronger acid and sometimes higher temperatures. Heap leaching of nickel laterite ores using sulfuric acid was advanced during the recent commodities boom period

Chapter H ENVIRONMENTAL GEOCHEMISTRY OF SKARN AND ...

Carbonate-hosted mineral deposits generally are less likely than other deposit types to generate acid mine drainage because of the availability of acid- neutralizing minerals, such as carbonates and reactive silicates, the coarse mineral grain size, and the high metal to sulfur ratios of many sulfide minerals in skarns (Kwong, 1993).

Morphological Variations During Carbonate Leaching of ...

Leaching plays a pivotal role in uranium extraction process. The intrinsic behavior of the industrial-scale leaching process is governed by microscopic phenomena such as microstructure of uranium and gangue minerals in the ore, diffusion and chemical reactions between molecules of solvent and solid phase during leaching. The present study includes in-depth microscopic investigations on ...

Alkaline leaching of brannerite. Part 1: Kinetics ...

uranium. 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-carbonate is a potential option.

Phosphate Upgradation Future Project – Delta Minerals

Phosphate Upgradation Future Project. According to different ore properties of phosphate, Delta Minerals designs many Processes for it such as flotation, gravity separation, chemical leaching, combined dressing, photoelectric sorting, etc. Flotation is widely used in phosphate including direct flotation, reverse flotation, reverse flotation and ...

Acid leaching of oxide–sulfide copper ore prior the ...

453 Acid leaching of oxide–sulfide copper ore prior the flotation – A way for an increased metal recovery Miroslav D. Sokić1, Vladan D. Milošević1, Velizar D. Stanković2, Vladislav Lj.Matković1, Branislav R. Marković1 1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 2University of Belgrade, Technical Faculty, Bor, Serbia

Phosphate and Carbonate Selectivity - Froth Flotation ...

It really depends on your ore by the way, Oxalic acid (OA) that would be one way, if you know the ZPC of your valuable mineral; you can decrease pH by OA, and depress carbonate minerals. Mineral liberation analysis is very important. Probably you have to do that on different steps and gradually.

The Effects of Phosphate Gangue on the Leaching of Uranium ...

The extractive metallurgy of brannerite: Leaching kinetics ...

Phosphate released by gangue minerals such as apatite can cause the formation of this layer however. When leaching with acidic ferric solutions, sulphate media is superior to chloride media. Alkaline carbonate leaching was also found to be effective for brannerite leaching, albeit …

Effects Of Acid Leaching Of Carbonate Gangue Minerals

The acid leaching of oxidized zinc ores and concentrates has some drawbacks This is because zinc carbonates (smithsonite, ZnCO 3; hydrozincite, 2ZnCO 33Zn(OH) 2) and silicates are generally acid consumers Also, they are usually associated with other …

Alkaline leaching of brannerite. Part 1: Kinetics ...

Refractory uranium ores containing uranium as multiple oxides typically require leaching at elevated temperatures (> 75 °C) and acid concentrations (> 50 g/L H 2 SO 4) in order to effectively extract the uranium.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 …

PRE-FLOTATION LEACHING OF POLISH CARBONATE COPPER …

gangue carbonate matrix. Acid leaching causes chemical decomposition of carbonate matter and re-leases fine grains of copper minerals. Kinetics of leaching of the investigated ore sample with various amounts of sulfuric acid were presented. It was shown that after decomposition of 70% of carbonates

Chapter E ENVIRONMENTAL GEOCHEMISTRY OF PLATFORM …

carbonate Hg deposits are covered by Rytuba (2002) in another chapter in this volume. Environmental Considerations All of the deposits considered in this review are hosted by rock packages that contain considerable amounts of carbonate minerals both in the rock itself and in veins and massive sulfide bodies that formed by mineralizing processes.