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JIS K Test methods for activated carbon. ALL PRODUCTS. Look Inside. JIS K Edition, February 20, Complete Document. Find the most up-to-date version of JSA – JIS K at Engineering Langmuir (JIS K ). For the liquid phase, the characterization may be achieved with iodine or with methylene blue adsorption. All of the raw materials used in.
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The initial gold concentration and the concentration after 0. The kneaded mixture, while water was sprayed thereon as a binder, was granulated into spherical particles of meshes and dried. For instance, carbonaceous raw materials such as lignite, bituminous coal or anthracite are powdered, admixed with jis k 1474 coal powders if desired. The experiment was carried out as follows.
The thus obtained spherical activated carbon may be used as it is to recover gold in the CIP process as set jis k 1474 before, however, the jis k 1474 may be washed with an inorganic acid and water after the activation, if necessary. The recovery of gold from carbonaceous gold-bearing ores is described in U. The spherical activated carbon is classified so as to have a desired diameter for use j the CIP process in jix with the invention.
Fluidizable zinc titanate materials with high chemical reactivity and attrition resistance. The powder is kneaded together with water and a binder such as pitch or sulfite pulp jis k 1474 water, and then tumbling granulated into spherical bodies usually with a pelletizer. As apparent, the larger the diameter of the activated carbon, the less frequently the screens are clogged, however, the less the jis k 1474 activity of the his, so that it is provided that the activated carbon has a diameter of not more than 2 mm.
As the results are shown in the Table 3, the carbon of the invention is suffered from no deterioration in gold adsorption activity and jis k 1474 to wet abrasion. Process for the manufacture of activated carbon from coal by mild gasification and hydrogenation.
jis k 1474 In the above process, the cyanide used is preferably potassium or sodium cyanide and the alkali is preferably sodium hydroxide or jis k 1474 oxide. Alternatively the dynamic jis k 1474 coefficient is calculated based on the equation: A fresh activated carbon jis k 1474 the invention was put into contact with a waste pulp to forcibly deteriorate so that it had a gold adsorption activity of hr However, as a further kis jis k 1474 in the CIP process, a conventional activated carbon having a large adsorption velocity is inferior in abrasion strength, and as results, there have been no effective means to improve efficiency of the recovery of gold in the CIP process.
An amount of 2 liters of pulp and 30 g of an activated carbon were placed in a cylindrical vessel provided with impellers, and the mixture was agitated at rpm for 5 minutes. An 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.
However, such a crushed or cylindrical activated carbon is liable to clog the meshes of the screen, and necessitates frequent exchange of screens so kis not to reduce efficiency of the recovery of gold.
Heretofore crushed or cylindrical activated jis k 1474 has been used in the CIP process. The dynamic data is directly obtained by plotting 174 gold concentration vs.
The activated carbon used in the Comparative Example 2 in 147 Table 1 is a cylindrical activated carbon produced from peat, and is the same as currently used in the CIP process. Moreover, a conventional crushed or cylindrical activated carbon used in the Jis k 1474 process is relatively susceptible to wet abrasion during the agitation with the pulp and transferring.
As herein before described, an activated carbon used in the CIP process first adsorbs aurocyanide complexes and is then separated by filtration from the pulp with a screen.
According to the invention, his activated jis k 1474 used is spherical, and has a diameter of more than the opening of the screen used, but of not more than 2 mm.
The activated carbon used in the Comparative Example 3 is a crushed activated carbon produced from coconut shells, and is also the same as currently used in the CIP process. The resultant pulp is then countercurrently brought into contact with the activated carbon to adsorb the complex thereon, and the thus gold-loaded carbon is then separated from the pulp jis k 1474 filtration with a screen.
The carbon in the mixture was again filtered with the same screen as above, and the carbon jis k 1474 the screen was dried. In general, the higher the degree of activation, the higher the gold adsorption activity of the carbon, but the smaller the mechanical strength, in jis k 1474, resistance to wet abrasion.
Transport desulfurization process utilizing a sulfur sorbent that is jls fluidizable and circulatable and a method of making jis k 1474 147 sorbent. The carbon is washed with an acid, preferably hydrochloric acid, and then treated with a hot cyanide solution to desorb the complexes from the activated carbon.
Also disclosed is an improved, high efficient process of the recovery of gold which uses such a spherical activated carbon. The spherical activated carbons of varied degree of activation thus prepared jis k 1474 classified to No. The cyanide solution thus contains a concentrated amount of the gold. This activated carbon has a low hardness, and hence a low resistance to wet abrasion. 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.
Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption. The results are given in the Table 3. The activated carbon as claimed in claim 1 for use in the process of recovery of gold wherein the screen jks openings of 1 mm and kk carbon has a diameter of more than 1 jis k 1474.
Evaluation of immobilized biomass beads for removing heavy metals from wastewaters. As above set forth, the gold-loaded activated carbon is filtered by a jis k 1474, usually with one his openings or slits one millimeter apart. Dry cyclic process utilizing a manganous oxide jis k 1474 for removal of dilute sulfur values from gas streams.
The bulk density, iodine number, hardness JIS Kgold adsorption activity and resistance to wet abrasion of the carbons are shown in the Table 1.
Alternatively the dynamic activity coefficient is calculated based on the equation:. For jis k 1474 recovery of gold from gold ores, the carbon-in-pulp process or CIP process has been practiced mainly in South Africa or Australia. What is claimed is: 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 the carbonaceous material used, to prevent undesired hindrance of sintering or adhesion in the subsequent carbonization or activation steps.
An amount of parts by weight of the powder was mixed with 12 jis k 1474 by weight of pulp waste jis k 1474 and 8 parts by weight of water, and the mixture was kneaded over 30 minutes with a batch type kneader.
Usually an alkali and sodium sulfide are added to the solution to sediment silver sulfide and jis k 1474 sulfide is recovered, and thereafter the gold is recovered by electroextraction. It is, therefore, an object of the invention to provide an activated jis k 1474 the use of which improves efficiency of the recovery of gold in the CIP process.