Leaching test on the Oxidized Copper Ore coming from Dishui, XinJiang Province is studied in the NH4CO3-H2O system；Systematic studies are made to show the effects of various factors on the leaching rate of copper. The optimum conditions for leaching is finally confirmed, namely the grinding size is 85% of -0.074mm, concentration of Ammonium carbonate 2mol/L, temperature 45°C, solid to ...
The effects of leaching parameters, such as ammonia concentration, ammonium sulphate concentration, leaching time, and solid-to-liquid ratio, were investigated on leaching of copper. A 2 factorial ...
The dissolution kinetics of malachite in ammonia/ammonium carbonate solution is controlled by the interface transfer and diffusion across the product layer both affect the reaction rate. This model equation is given as 1/3ln(1−X)−[1−(1−X) −1/3]=kt. The activation energy of the ammonia leaching reaction was found to be 15 kJ mol −1.
Experiments on ammonium carbonate leachng of native copper ores crushed to 1-inch size showed that in 30 days 55 percent of the copper was extracted from 0.7 percent copper conglomerate-type ore, and 85 percent was extracted from 2.1 percent copper amygdaloid-type ore.
Fig. 1 Leaching of raw and reduced ore with ammonium sulfite. Fig. 2 pH change on treating ammoniacal ammonium carbonate solution by SO2 When SO2 is bubbled further, the solution turns yellow, the pH will gradually decrease until at pH 5 then rapidly to pH 3. This rapid pH change is accompanied by turbidity, then the formation of a precipitate.
3/28/2016· Hey guys, in this video we will be making a little bit of basic copper carbonate. To do this, we use copper sulfate pentahydrate and sodium carbonate (which was made in a previous video).
Additional Physical Format: Online version: Staker, W.L. (W. Lyman). Improved cupric ammonium carbonate leaching of copper scrap. [Washington, D.C.] : U.S. Dept. of ...
12/10/2013· Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new approach in the world to this method.
In-situ leaching (ISL), also called in-situ recovery (ISR) or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, in situ.In situ leach works by artificially dissolving minerals occurring naturally in a solid state. For recovery of material occurring naturally in solution, see: Brine mining.
Alternatives were developed to the conventional ammoniacal carbonate leaching-steam stripping procedure for recovering copper as an oxide from contaminated scrap metal. By entraining air bubbles in the leach solution, the copper dissolution rate was increased to 1.5 G/in2 of copper surface per hour, compared to 0.5 G/in2/hr produced by ...
Ammonia leaching of sulfide copper concentrates generate buffer type liquors (pH ranges from 9 to 10), because of the excess of ammonia and significant amount of ammonia sulfate as a leaching agent. Metals such as Cu, Ni, Co and Zn occur in ammonia systems as a cationic amminacomplexes. Alkalinity of the solution and free
ammonium hydroxide copper leach. Aug 21, 1979 This has made it possible to recycle the leach liquor to the copper leaching step of, sufficient ammonium carbonate for the leaching of copper, ....
On a commercial scale the leaching of native copper ores by a solution of ammonia and ammonium carbonate is possible as in the case of Calumet and Hecla Mining Co. (3). Universal Mineral and Metals, Inc. leaches scrap copper by a solution of ammonia, ammonium carbonate, and copper ammonium carbonate …
Studying on Leaching Process of African Copper Oxide Ore by Ammonium Carbonate Solution: SONG Zhi-peng, HU Guo-rong, PENG Zhong-dong, ZHOU Yu-lin: School of Metallurgical Science ＆ Engineering, Central South University, Changsha 410083, Hunan, China
The effect of reaction temperature on the leaching rate of copper from the malachite ore in ammonium sulfate solutions was examined at temperatures of 30, 40, 50, 60, and 70 °C. While conducting these experiments, the values of ammonium sulfate concentration, solid to liquid ratio, particle size, and stirring speed were fixed at 4 mol/L, 2 g ...
(5) No advantages were found to support the use of either ammonium sulfate leaching or ammonium hydroxide forti- fication of the ammonium carbonate leaching solution. (6) Ammonium carbonate leaching is a practical method for reducing the copper and nickel contents of sludges to
Probably, ammonium carbonate fulfils most if not all of the above requirements. The results derived from leaching experiments, using ammonium carbonate solutions and various experimental variables, on the copper flue dust are summarized in Table 2. From this series of experiments it can be deduced that under the various experimental
The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper …
Trans. Nonferrous Met. Soc. China 22(2012) 2822âˆ'2830 Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong 1, 2, YIN Zhou-lan 1, HU Hui-ping 1, CHEN Qi-yuan 1 1.
The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it was 4.0. The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the
The effects of oxidized copper ores which came from Yunnan province were carried out by using ammonialeaching methods in the laboratory.In order to seek the optimum leaching conditions under normal temperature and pressure,we conducted a series of validation experiments. Theoptimum conditions were obtained as follows: ammonia concentration 2.5mol/L, ammonium …
malachite in ammonia ammonium carbonate l– eaching" Hydrometallurgy, vol. 76, issue 1-2, 2005,pp. 55-62 [8] Chang chinJung- and J.C. Liu, "Feasibility of copper leaching from an
The ammonia-ammonium carbonate leaching method was proposed for the removal of phosphorus and extracting manganese from high-phosphorus manganese ore, both effectively and environmentally.
Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong1, 2, YIN Zhou-lan 1, HU Hui-ping1, CHEN Qi-yuan1 1. School of Chemistry and Chemical Engineering, Central …
8/21/1979· Preferably, the leaching step is carried out with an ammonium carbonate solution containing a molar excess of ammonium carbonate relative to copper, e.g., 20-50%, preferably about 30%, molar excess of ammonium carbonate, and containing free ammonia, e.g., 10-50 grams of ammonia per liter of leaching solution, preferably about 25 grams of ...
METAL RECOVERY FROM SECONDARY COPPER CONVERTER DUST BY AMMONIACAL CARBONATE LEACHING By Robert C. Gabler, Jr.,1 and Jack R. Jones2 ABSTRACT Effective recycling or disposal of flue dusts is a continuing problem, particularly for secondary smelters