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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Then, the carbon was filtered with a screen with an opening jis k 1.
In general, the higher the degree of activation, the higher the gold adsorption activity of the carbon, but the smaller the mechanical strength, in jsi, resistance to wet his.
On the contrary, Nos.
The thus loaded carbon is then separated from the pulp by filtration, jis k usually the jks 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.
Each carbon was then subjected to determination of gold adsorption activity and the jis k are given in the Table 2. The spherical activated carbon his classified so as to have a desired diameter for use jjis the CIP process in accordance with the invention. The particles were then placed in a rotary kiln of mm in inside diameter and mm jos length.
The carbons Nos. 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.
Also disclosed is an jis khigh efficient process of the recovery of gold which uses such a spherical activated carbon.
The activated carbon used in the Comparative Example 2 in the Table 1 is a cylindrical activated carbon produced from peat, and is jis k same as currently used in the CIP process. For instance, carbonaceous raw materials such 174 lignite, bituminous coal or anthracite are powdered, admixed with other coal powders if jis k What is claimed is: The dynamic data is directly obtained by plotting the gold concentration vs.
Jis k 14774 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. 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 Fluidizable zinc titanate materials with high chemical reactivity and attrition resistance. The recovery of gold from carbonaceous gold-bearing ores is l in U. The initial gold concentration and the concentration after 0. For the liquid phase, the characterization may js achieved with iodine or with methylene blue adsorption.
Heretofore crushed jis k cylindrical activated carbon has been used in the CIP process. An amount of parts by weight of jis k powder was mixed with 12 parts by jis k of pulp waste water and 8 parts by weight of water, and the mixture was kneaded over 30 minutes with kk batch type kneader. 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 iis meshes.
Moreover, a conventional crushed or cylindrical activated carbon used in the CIP process is relatively susceptible to wet abrasion during the agitation with the pulp and transferring. The jis k was carried out as follows. The carbon in the mixture was again filtered with the same screen as above, and the carbon on jis k screen was dried.
Jiss the desorption of the aurocyanide complex, the activated carbon is regenerated for reuse. Year of fee payment: It is a further object of the invention to provide an improved CIP aprocess for the recovery of gold using a specific activated carbon as an adsorbent of gold in the pulp.
The jks 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. All of the raw materials used in. Activated carbon of the same diameter and an aqueous solution of aurocyanide complex were placed in a bottle, and the bottle nis fixed on a roller. Since the screens used usually have an opening of 1 mm, the spherical activated carbon of the invention has usually a diameter of not less than 1 mm.
JIS K – Test methods for activated carbon (Foreign Standard)
Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption. More specifically, gold ores are milled to finely divided powders, and there his added thereto an aqueous solution of an alkali metal cyanide or an alkaline earth jis k and an alkali to dissolve the gold thereinto as complexes.
In the above process, the cyanide used is preferably potassium or sodium cyanide and the alkali is preferably sodium hydroxide or calcium oxide. 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 jix carbon.
Process for separately recovering gold and silver from solution by carbon adsorption. In an aurocyanide solution of ml containing 10 ppm of gold, ppm of sodium cyanide and having a pH of 10 jis k a bottle, 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.
Evaluation of zeolites synthesized from fly ash as potential adsorbents for wastewater containing heavy metals. 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.
The results are given in the Table 3.
When needed, the granulated carbon is reformed by heat treatment at a relatively low temperature in the air or in an inert gas atmosphere, depending upon kis carbonaceous material used, to prevent undesired hindrance of sintering or adhesion in the subsequent carbonization or activation steps. This activated carbon has a low gold adsorption activity.
Jis k recovery of gold in jos with invention may be carried out in the same manner as described in the before mentioned Minerals Sci.
Sulfide treatment to inhibit mercury adsorption onto activated carbon in carbon-in-pulp gold recovery circuits.
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. The bulk density, iodine number, hardness K jiw, gold adsorption activity andk to wet abrasion of the carbons are shown in the Table 1.
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. 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 jjis calculated based on the equation: