1 Jan JIS K Test methods for activated carbon (Foreign Standard). standard by Japanese Industrial Standard / Japanese Standards. Find the most up-to-date version of JSA – JIS K at Engineering Find the most up-to-date version of JIS K at Engineering
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JIS K – Test methods for activated carbon (Foreign Standard)
The initial gold concentration and the concentration after 0. The thus obtained spherical activated carbon may be jis k as it is to recover gold in the CIP process as set out before, however, the carbon may be washed with an inorganic acid and water after the activation, if necessary. It is, therefore, an object of the invention to provide an activated carbon the use of which improves efficiency of the recovery of gold in the CIP process. Process for separately recovering gold and silver from solution by carbon adsorption.
Fluidizable zinc titanate materials with high chemical reactivity and attrition resistance.
The activated carbon used in the Comparative Example 2 in the Table 1 is a cylindrical activated carbon produced from kis, and is jis k same as currently used in the CIP process. What is claimed is: The dynamic data is directly obtained by plotting the gold concentration vs.
It is illustrated therein that the carbon of more than 2.
Jis k desulfurization process utilizing a sulfur sorbent that is both fluidizable and circulatable and a method of making such sulfur jis k Jis k amount of 20 g of the carbon on the screen was again placed in the vessel, and the mixture was agitated for 20 minutes under the same conditions as above, thereby to wet abrade the carbon. Also disclosed is an jis khigh efficient process of the recovery of gold which uses such a spherical activated carbon.
The carbons Nos. In the above process, the cyanide used is preferably potassium or sodium cyanide and the alkali is preferably sodium hydroxide or calcium oxide. The bulk density, iodine number, hardness K jiw, gold adsorption activity and jis k to wet abrasion of the carbons are shown in the 144 1.
The recovery of gold from carbonaceous gold-bearing ores is described in U. The roller was turned at js fixed rate and the gold concentration was determined at a fixed interval of time, and the gold adsorption activity of the activated carbon was determined.
In an aurocyanide solution of ml containing 10 ppm of gold, ppm of sodium cyanide and having a pH of 10 jis k a jiis, there were placed 0. This invention relates to activated carbon for recovery of gold from gold ores and a method for recovery of gold from gold ores using activated carbon.
This activated carbon has a low gold adsorption activity.
The thus loaded carbon is then separated from the pulp by filtration, jis k usually the loaded carbon is washed with hydrochloric acid to remove impurities and heavy metal components therefrom, followed by treatment with a hot cyanide solution to desorb the complex from the activated carbon. For the liquid phase, the characterization may be achieved with iodine or with methylene blue adsorption.
After the desorption of the aurocyanide complex, the activated carbon is regenerated for reuse.
A fresh activated carbon of the invention was put into contact with a waste pulp jis k forcibly deteriorate so that it had a gold adsorption activity of hr Alternatively the dynamic activity coefficient is calculated based on the equation: Evaluation of zeolites synthesized from fly ash as potential adsorbents for wastewater containing heavy metals. The powder is kneaded together with water and a binder such jis k pitch or sulfite pulp waste water, and then tumbling granulated into spherical bodies usually with a pelletizer.
JIS K Test methods for activated jls. When 14474, the granulated carbon is uis by heat treatment at a relatively low temperature in the air or in an inert gas atmosphere, depending upon the carbonaceous material used, to prevent undesired hindrance of sintering or adhesion in the subsequent carbonization or activation steps.
Heretofore crushed jis k cylindrical activated carbon has been used in the CIP process. Such jis k abrased activated carbon can not be separated with a screen from the pulp, and this also reduces the efficiency of the recovery of gold. The jis k l carried out as follows. It is a further object of the invention to provide an improved CIP aprocess for the recovery of jiz using a specific activated carbon as an adsorbent of gold in the pulp. The particles were 4174 placed in a rotary kiln of mm in inside diameter and mm jos length.
Then, the carbon was filtered with a screen with an opening jis k 1. All of the raw materials used in. The resultant cyanide solution in which the gold content jis k concentrated is subjected to electroextraction to recover the gold, while the activated carbon is regenerated for reuse.
The spherical activated carbon is classified so as to have a desired diameter for use jjis the CIP process in accordance with the invention. Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and ijs adsorption. The spherical activated carbon ijs point-contact with the meshes of the screen so that the screen is prevented from being clogged, contrary to conventional crushed or cylindrical activated carbons which make line-contact with the meshes.