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Acid leaching

use for uranium ores In uranium processing Leaching Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature Except in special circumstances sulfuric acid is the leachant used it is supplied in amounts sufficient to obtain a final leach liquor at about Pegue o preço

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Impacts of Uranium In

Jan 09 2015Existing and Proposed Uranium In-Situ Leaching Sites From 1979 in-situ leaching was also applied using wells drilled from the surface The leaching agent used in most cases was sulfuric acid From 1981 in-situ leaching was also used to increase the yield from mined out conventional underground mines [Tabakov1993] Pegue o preço

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Does sulfuric acid react with copper?

In summary sulfuric acid is not a strongly oxidizing acid however concentrated sulfuric acid is a strong enough oxidizing agent to dissolve copper Sulfur dioxide is produced by reduction of the sulfuric acid That copper(II) ions are in the aqueous solution is shown by the formation of the deep blue copper-ammonia complex Pegue o preço

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23 3 Hydrometallurgy

Heap leaching is an extraction process by which chemicals (usually sulfuric acid) are used to extract the economic element from ore which has been mined and placed in piles on the surface Heap leaching is generally economically feasible only for oxide ore deposits Pegue o preço

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Extraction of vanadium from sulfuric acid leaching

The sulfuric acid leaching solution of stone coal was prepared by roasting the stone coal at 850 C for 1 h followed by leaching with 15% (v/v) H 2 SO 4 and 5% (wt) NaClO 3 ( as oxidant) at 95 C Fig 1 is the forms of vanadium (and for 6 h Due to roasting and oxidative Pegue o preço

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The Leaching of Hematite in Acid Solutions

The leaching rate of hematite was seen to be first order with respect to hydrogen ion activity a(H+) in hydrochloric acid or perchloric acid solutions with or without the addition of common salts while the rate was of a half order in sulfuric acid solutions with or without the addition of sodium sulfate Pegue o preço

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Sulfuric acid a dangerous mining aid

Sulfuric acid a dangerous mining aid Access to water has been restricted in several towns across Mexico after water was contaminated following a leak at a nearby mine According to the national water authority Conagua some 40 000 cubic meters (1 4 million cubic feet) of leached copper in sulfuric acid was spilled into the Bacanuchi River Pegue o preço

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Sulfuric acid injection in copper heap leaching

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap where it dissolves the copper from the ore The resulting solution of sulfuric acid and copper sulfate is collected in a small pool Pegue o preço

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Sulfuric acid a dangerous mining aid

Sulfuric acid a dangerous mining aid Access to water has been restricted in several towns across Mexico after water was contaminated following a leak at a nearby mine According to the national water authority Conagua some 40 000 cubic meters (1 4 million cubic feet) of leached copper in sulfuric acid was spilled into the Bacanuchi River Pegue o preço

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In situ leach

Copper is usually leached using acid (sulfuric acid or hydrochloric acid) then recovered from solution by solvent extraction electrowinning (SX-EW) or by chemical precipitation Ores most amenable to leaching include the copper carbonates malachite and azurite the oxide tenorite and the silicate chrysocolla Pegue o preço

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A Review on Novel Techniques for Chalcopyrite Ore Processing

The results of this study have shown that sulfuric acid leaching in the presence of hydrogen peroxide is an effective route for copper and zinc recovery from Nigerian complex sulfide ore The dissolution process in the presence of H 2 O 2 has been investigated by both Jiang et Pegue o preço

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Sulfuric acid leaching of sulfide slag of Sarcheshmeh

Sulfuric acid leaching is the most conventional method for extraction of copper because of its economic advantages Several factors affect the solubility of different elements in this acid As an example low concentrated sulfuric acid leaches the copper carbonates and the copper oxides and it has a little effect on copper silicates Pegue o preço

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Sulfuric Acid

Sulfuric acid is a key element in the production of fertilizer (phosphates and ammonium sulfate) which is its primary use (approximately 65% of total consumption) Sulfuric acid is also used in the mining industry for leaching of copper nickel uranium and other elements from ores (approximately 15% of Pegue o preço

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High Pressure Acid Leach

High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius) elevated pressures (roughly 50 bar or 725 psi) and sulfuric acid to separate nickel and cobalt from the laterite ore Pegue o preço

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Leaching of Metals from Hydrometallurgical Residue by

The optimum conditions for the extraction Zn Fe and Cu are leaching temperature 85 C sulfuric acid concentration 2 mol L-1 the smaller particle size 63m and the solid-to-liquid ratio 1 10 After 2 h of leaching treatment at these optimum conditions over 80% of metals are extracted from the residues Pegue o preço

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KINETICS AND MECHANISM OF SPHALERITE LEACHING BY

leaching kinetics of the silicate concentrate by sulphuric acid Ferric and cupric ions bacteria oxygen and other oxidants have been used as leaching agents of sphalerite in sulphate and chloride media under atmospheric or pressure leaching conditions Ferric ion in either sulphate or chloride media can be used to leach sphalerite Pegue o preço

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Sulfuric Acid

Sulfuric acid is a key element in the production of fertilizer (phosphates and ammonium sulfate) which is its primary use (approximately 65% of total consumption) Sulfuric acid is also used in the mining industry for leaching of copper nickel uranium and other elements from Pegue o preço

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Sulfuric Acid Chlorine Bleach Reaction

Mar 13 2018Bleach and Sulfuric Acid When an acid is mixed with sodium hypochlorite the acid will donate a hydrogen molecule to the compound replacing the sodium molecule (Na) to produce hypochlorous acid (HClO) Mixing sulfuric acid with a solution of sodium hypochlorite will result in a solution of sodium sulfate (Na2SO4) and hypochlorous acid Pegue o preço

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Leaching and recovery of zinc and copper from brass slag

Abstract Leaching and recovery processes for zinc and copper from brass slag by sulfuric acid were carried out and iron and aluminum were also precipitated as hydroxides in addition to silica gel The factors affecting the performance and efficiency of the leaching processsuch as agitation rate leaching time acid concentration and temperature were separately investigated Pegue o preço

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Fractal kinetic characteristics of hard

Sep 19 2018Sulfuric acid leaching is a non-selective process During the leaching process mineral impurities are also dissolved in the leaching solution and those minerals exist in the solution in ionic state or precipitate produced by plasma in combination with sulfuric acid root Pegue o preço

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Heap Leaching Mining Techniques Metals Mining Copper

Sulfuric acid heap leaching of nickel The technique is an acid heap leaching process like that of the copper method in that it uses sulfuric acid instead of cyanide solution to liquefy the target minerals from crushed ore The process has been urbanized by European Nickel PLC for the rock laterite deposits of Turkey and the Balkans Pegue o preço

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STUDIES ON TREATMENT OF URANIUM ORES I LEACHING OF

The results obtained showed that the atmospheric oxidation leaching with dilute sulfuric acid was an attractive method for extraction of uranium from such low grade ore By this method over 96% of the uranium together with some copper more and from 0 3 to 2% of the iron were extracted at 60 deg C in 6 Pegue o preço

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In Situ Leach Mining (ISL) of Uranium

Otherwise acid (sulfate) leaching is generally better In this case the leach solution is at a pH of 2 5-3 0 about the same as vinegar Acid leaching gives higher uranium recovery – 70-90% – compared with 60-70% for alkaline leach and operating costs are about half those of alkaline leach Pegue o preço

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WO2001075184A2

The leach solution preferably contains sulfuric acid but other acids such as hydrochloric and nitric acid are also feasible The heap may then be rinsed with water (either fresh or salt water) concentrated or dilute acid or a combination of them with the effluent being collected for recovery of metal values Pegue o preço

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High Pressure Acid Leach

High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius) elevated pressures (roughly 50 bar or 725 psi) and sulfuric acid to separate nickel and cobalt from the laterite ore Pegue o preço

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Sulfuric acid leaching of sulfide slag of Sarcheshmeh

Sulfuric acid leaching is the most conventional method for extraction of copper because of its economic advantages Several factors affect the solubility of different elements in this acid As an example low concentrated sulfuric acid leaches the copper carbonates and the copper oxides and it has a little effect on copper silicates Pegue o preço

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Acid Rock Drainage and Metal Leaching at the Proposed

Acid drainage and metal leaching occur because the metals we want from mines commonly exist as complex chemical compounds in the rock The entire mineral makeup of the rock not just the copper or gold determines how excavating and storing rock affects the environment Pegue o preço

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Sulfuric acid injection in copper heap leaching

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap where it dissolves the copper from the ore The resulting solution of sulfuric acid and copper sulfate is collected in a small pool Pegue o preço

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The sulfuric acid bake and leach route for processing of

Baillie and Hayton (1970) tested sulfuric acid leaching and sulfuric acid baking for recovery of rare earths from the allanite bearing Mary Kathleen uranium tailings Approximately 65% of the rare earths dissolved in sulfuric acid (of unspecified concentration) at 60% solids density and boiling temperature Pegue o preço

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In situ remediation of bauxite residue by sulfuric acid

In situ remediation of a bauxite residue by integrating a storage area with CSIRO's soda recovery process was evaluated The process consisted of the following steps bauxite residue is neutralized with sulfuric acid the slurry is separated into a neutralized residue and a leachate Pegue o preço

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Leaching of metals from hydrometallurgical residue by

Effect of acid Concentration The effect of sulfuric acid on the leaching of the recovery of metals Zn Fe and Cu was studied at constant temperature (85 C) particle size (63μm) leaching time of 2h and solid-to-liquid ratio (1 10) The results of the effect of H 2 SO 4 concentration on of the recovery of metals are illustrated in Figure 6 It is apparent from figure 4 that the recovery of Zn Fe and Cu increases with Pegue o preço

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Process Intensification of Zinc Oxide Leaching Process

leaching of heavy metals Sulphuric acid is the most common leaching agent because of its chemical properties and also its relatively low cost The acid is usually used in its dilute state to leach copper oxides zinc ores phosphate ores among many others [3 4] Pegue o preço

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