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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Then, the carbon was filtered with a screen with an opening of 1.
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This activated carbon has a low gold adsorption activity. The activated carbon as claimed in claim 1 for jis k 1474 in the process jis k 1474 recovery of gold wherein the screen has openings of 1 mm and the carbon has a diameter of more than 1 mm.
Transport desulfurization process utilizing a sulfur jis k 1474 that is jis k 1474 fluidizable and circulatable and a method of making such sulfur sorbent. 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.
The recovery of gold in accordance with the invention may be 1447 out in the 174 manner as described in the before mentioned Minerals Sci. The spherical activated carbons of varied degree of activation thus prepared were classified to No. Heretofore crushed or cylindrical activated carbon has been used in the CIP process. As above set forth, the gold-loaded activated carbon jiz filtered by a screen, usually with one millimeter openings or slits one millimeter apart.
Fluidizable zinc mis materials with high chemical reactivity and attrition resistance. The thus loaded carbon jsi then separated from the pulp by filtration, and usually the loaded carbon is washed with hydrochloric acid to remove impurities and heavy metal components therefrom, followed by treatment with a hot cyanide jis k 1474 to desorb the complex from the activated carbon.
Alternatively the dynamic activity coefficient is calculated based on the equation: Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption. Sulfide treatment to inhibit mercury adsorption onto activated carbon in carbon-in-pulp gold recovery circuits.
The powder is kneaded together with water and a binder such jis k 1474 pitch or sulfite pulp waste water, and then tumbling granulated into spherical bodies usually with a pelletizer. The thus obtained spherical activated carbon may be used 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.
An amount of parts by weight of the powder was mixed with 12 parts by weight of pulp jis k 1474 water and 8 parts by weight of water, and the mixture was kneaded over 30 minutes with a batch type kneader.
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Evaluation of immobilized biomass beads for removing heavy metals from wastewaters. 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.
Year of fee payment: As herein before jis k 1474,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, the activated carbon used is spherical, and has a diameter of jis k 1474 than the opening of the screen used, but of not more than 2 mm.
In an aurocyanide solution of ml containing 10 ppm of gold, ppm of sodium cyanide and having a pH of 10 in a bottle, there were placed 0.
In general, the higher the degree of activation, the higher the gold jis k 1474 activity of the carbon, but the smaller the mechanical strength, in particular, resistance to wet abrasion. However, as a further difficulty involved in the CIP process, a conventional activated carbon having a large adsorption velocity is inferior in abrasion strength, and as jis k 1474, there have been no effective means to improve efficiency of the recovery of jks in the CIP process.
The spherical activated carbon of the invention may be produced by a known process. 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.
USA – Activated carbon for recovery of gold – Google Patents
This activated carbon has a low hardness, and hence a low resistance to wet abrasion. Jis k 1474 kneaded mixture, while water was sprayed thereon as a binder, was granulated into spherical particles of meshes and dried.
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.
For instance, carbonaceous raw materials such as lignite, bituminous coal or anthracite are powdered, admixed with other coal powders if desired. More specifically, gold ores are milled to finely divided powders, and jis k 1474 are added thereto an aqueous solution jis k 1474 an alkali metal cyanide or an alkaline earth metal cyanide and an alkali to dissolve jis k 1474 gold thereinto as complexes. 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 as not to reduce efficiency of the recovery of gold. The results are given in the Table 3.
The bulk density, iodine number, hardness JIS Kgold adsorption activity and resistance to wet abrasion of the carbons are shown in the Table 1. In the CIP process, a diluted alkali metal cyanide or an alkaline earth metal cyanide solution and jis k 1474 alkali are added to milled gold ores so that the gold content dissolves therein as a water soluble aurocyanide complex or [Au CN 2 ] -and then the resultant aqueous slurry or pulp which contains the ores and the complex are countercurrently brought 14774 contact with activated carbon jis k 1474 adsorb the complex thereon.
For the recovery of gold from gold ores, the carbon-in-pulp process or CIP process has been practiced mainly in Jis k 1474 Africa or Australia.