Sulfuric Acid Leaching of Smelter Matte

Sulfuric acid leaching of lead smelter mattes resulted in the recovery of about 45 pct of the nickel and cobalt and 10 to 45 pct of the copper. The addition of manganese dioxide increased the cobalt and nickel recovery from 45 pct to greater than 90 pct, and increased the copper from 10 to 45 pct to nearly 100 pct recovery. The cobalt and nickel extractions were found to be less dependent on ...

Dissolution kinetics of hemimorphite in methane sulfonic acid

However, for the low-grade zinc ores containing high Fe-bearing and carbonate minerals 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).

Copper LPF Leach Precipitation and Flotation Process

The gangue is siliceous so no excessive acid-consuming carbonate gangue minerals are present. Approximately 40% of the total copper occurs in non-sulphide form. Approximately 40% of the total copper occurs in non-sulphide form.

Uranium Extraction from Tailings by Dilute Alkali ...

The dissolution of gangue in alkaline or acidic solutions is of interest in a large number of fields. 19, 20 Acid leaching is typically preferred to alkali methods, as it frequently offers a more rapid dissolution kinetics and is able to leach more efficiently at coarser grades. 21 Alkali leaching is used where the reactivity of the gangue prevents acid leaching. 21, 22 Additionally, alkali ...

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,

Effects of organic acids on dissolution of Fe and Mn from ...

Effects of organic acids on dissolution of Fe and Mn from weathering coal gangue ... Continuously leaching the coal gangue for 24 h with the leaching solution was taken up to simulate the light rain (12.7 mm 24 h-1, i.e., 1 drop min-1) leaching on the coal gangue. Prior to e, samples were filtrated to a 50 mL plastic centrifuge tube with a 0.45 lm filter membrane. The remaining collected ...

Heap Leach Of Magnesium Carbonate Copper Ores

effects of acid leaching of carbonate gangue minerals The Chemistry of Copper Heap Leaching. . Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia .

Minerals & Metallurgical Processing

The effects of acid type, acid concentration, leaching temperature and leaching time on the dissolution of gangue minerals were studied. The most suitable leaching conditions were determined to be 20% HCl + 4% HF for acid type and concentration, 85 ºC for leaching temperature and 4 hours for leaching time. After removing the gangue minerals at these optimum conditions, the total carbon ...

Uranium Extraction from Tailings by Dilute Alkali ...

sociating uranium from gangue minerals is a new research topic for increasing uranium extraction from tailings with a high content of gangue minerals.18 The dissolution of gangue in alkaline or acidic solutions is of interest in a large number of fields.19,20 Acid leaching is typically preferred to alkali methods, as it frequently offers a more rapid dissolution kinetics and is able to leach ...

Acid Rain Effects - Soils - Elmhurst College

Acid deposition adds hydrogen ions, which displace these important nutrients in a process called leaching. Leaching means that the ions are washed deeper into the subsoil or washed out of the top soil. If ions are leached from the soil, they are no longer available to the roots of the plants.

EFFECTS OF MINERAL ADMIXTURE ON THE CARBONIC ACID …

effects of carbonic acid leaching on the mechanical strength of mortars, as well as relative mass loss, microstructure, and composition of various cement pastes. The results indicate that cement pastes containing less than 20 % fly ash have higher

Dissolution Kinetics of Malachite in Sulphuric Acid ...

Leaching with ammonia-water and ammonium carbamate does not affect gangue minerals such as quartz and calcite and it can also promote the dissolution of minerals that contain copper. This leaching ...

METAL LEACHING (ML/ARD) ANALYSIS - sgs.ca

Metal leaching (ML) and acid generation can have devastating effects on our environment. Acid generation occurs when waste rock that contains sulfide minerals, such as pyrite or pyrrhotite, is exposed to oxygen and water in the absence of acid neutralizing carbonate minerals. The oxidation of these sulfides results in the precipitation of ferric iron and the release of hydrogen ions. When this ...

EP0453677B1 - Depression of the flotation of silica or ...

Flotation is a process of treating a mixture of finely divided mineral solids, e.g., a pulverulent ore, suspended in a liquid whereby a portion of the solids is separated from other finely divided mineral solids, e.g., silica, siliceous gangue, clays and other like materials present in the ore, by introducing a gas (or providing a gas in situ ...

Fractional factorial design for studying uranium carbonate ...

Moreover, the reactivity of the gangue-hosted carbonate-containing minerals can prevent acid leaching (Lunt et al., 2007). In addition to its uranium-leaching property, sodium carbonate is a kitchen-used chemical which has reasonably no hazardous effect on the environment. The alkaline leaching process utilizes carbonate instead of acid and requires the addition of an oxidant in the case of ...

Copper extraction - Wikipedia

Such oxide ores are usually leached by sulfuric acid, usually in a heap leaching or dump leaching process to liberate the copper minerals into a solution of sulfuric acid laden with copper sulfate 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

barite acid leaching congo - xclusivedirectory.co.za

barite,fluorite,Ca Mg Mn Fe carbonate minerals such as rhodochrosite.This extreme form of acid leaching occurs in the higher levels of epithermal major producing countries are Congo Republic (Zaire),Botswana,South Africa.Angola.

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

The beneficiation of phosphate ores containing carbonate gangue by conventional techniques such as physical separation methods or flotation is very difficult due to the similarities in physico-chemical properties of constituent minerals present in the system.

AJ Parker CRC for Hydrometallurgy, Division of Mining and ...

indicates a first order reaction rate with acid and a zero order rate with gangue mineral concentration after fast leaching carbonate has been neutralised. A model for acid consumption has been developed that combines the knowledge of the rate in a column test with the residence time distribution of the solution. This is then used to predict the consumption rate in a commercial leach by taking ...

Gangue–reagent interactions during acid leaching of uranium

During the acid leaching of uranium, gangue–reagent interactions have both negative and positive con-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 various carbonate ...

What Are the Effects of Leaching? | Sciencing

While not directly responsible for erosion, the effects of nutrient leaching provide the opportunity for erosion to occur. For example, the acidification of soil can limit the types of plants that grow in a particular area, which leads to poorly developed root systems.

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 silicate gangue. Due to factors including slower ...

Leaching kinetics of copper flotation tailings in aqueous ...

The dissolution of carbonate gangue minerals, which are often ubiquitous in copper deposits, leads to the consumption of large amounts of acid during the leaching of such ores, which can make the ...

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

The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total Mn (TMn), MnO2 and MnCO3 leaching were investigated. Results showed that MnCO3 could more easily react with hydrogen ions than MnO2 in ores, and MnO2 decomposition could be advantageous for MnCO3 leaching. The leaching efficiencies of 91.8% for total Mn, 91.4% for MnO2 and 96.9% for ...

The kinetics of zinc silicate leaching in sodium hydroxide

The kinetics of zinc silicate leaching in sodium hydroxide Fabiano M.F. Santos, Pablo S. Pina, ... acid leaching to dissolve zinc from the ores/concentrates and special care is taken to avoid the formation of silica gel. This can be achieved by a stepwise addition of sulphuric acid, whereby the silicate is dissolved with a minimum silica gel formation (Souza et al., 2009). The acid leaching of ...

The extractive metallurgy of brannerite: Leaching kinetics ...

Certain leaching experiments were repeated with the addition of minerals commonly associated with brannerite to gain a clearer understanding of the effects of deleterious gangue. These experiments were run at the extremes and middle of the range of temperatures and acid concentrations studied. Ilmenite accelerated the precipitation of anatase while fluorite significantly increased the rate of ...

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

Reduction of "oxide copper", by acid leaching prior the flotation concentra- tion, can increase the overall copper efficiency up to more than 70% in the single-stage leaching, achieving an efficiency in the flotation concentration stage higher than 75%.