①applicable ore types: golden and silver oxidized ore, primary ore, high-sulfur and high-arsenic gold ore, cyanidation slag, gold concentrate, pyrite
cinder and anode mud etc;
②applicable beneficiation process: dump leaching, pool leaching and carbon pulp (agitation leach) etc.
2. jinchan product form: solid lump or graininess
3. jinchan dissolution method: it can be used after being fully dissolved by water under normal temperature (in general, the dissolution can be accelerated in flowing water or through full stirring; dosing pool can be built near to the barren solution pool in heap leaching process in order to let backwater which has passed carbon directly wash golden cicada and dissolve it into barren solution pool);
4.alkalinity adjustment: in general, adjustment is carried out with lime or caustic soda with stable ph value between 11-12; when the ph value of backwater
decreases, alkalinity shall be timely adjusted; when the ph value is too high (more than 12) for a very long time, alkali dirty will be generated and affect the
activated carbon adsorption or the liquid passivation will occur and affect the leaching effect);
5.dosage calculation
①the dosage of golden cicada can refer to the dosage of sodium cyanide. it is recommended to carry out beneficiation test and refer to its optimum
conditions; (1-2 g/t gold oxidized ore is common and the golden cicada concentration is generally maintained between 0.3-0.8 ‰. make proper
adjustment in accordance with different ore grades and harmful component);
②calculation method of dosage: added dosage of golden cicada=(optimum concentration value－measured concentration value)×water volume in
dosing pool; assuming that the optimum concentration value of golden cicada is 1.5 ‰ (calculated as per water volume), the backwater golden cicada
concentration is 0.6 ‰ and barren solution pool has water of 500 square meters, then the added dosage of golden cicada is (1.5－0.6)×500=450 kilograms.
6.product use flow: (in accordance with dump leaching and carbon leaching process with the use of sodium cyanide)
①process of heap leaching and pool leaching: raw ore crushing, entering pump/pool, leaching, activated carbon adsorption (zinc dust replacement), resolution electrodeposition and smelting;
②carbon pulp process (agitation leach): raw ore crushing, ore grinding, carbon leaching, electrolysis and smelting;
7.other matters
①it is recommended to used special golden coconut shell absorption carbon or zinc dust as the auxiliary absorption agent (special activated carbon special for carbon pulp gold extraction is used in the cip process);
②the best effect will be obtained when golden cicada is used at the temperature of more than 15℃;
③the gold leaching speed is relatively big, so it is recommended to detect pregnant solution grade, ph value and golden cicada concentration at regular time;
④it is not recommended to put in strong oxidizers such as hydrogen peroxide and potassium permanganate together with golden cicada (pre-treatment can be made);
⑤the use of ammonia water, sodium sulfide, potassium ferricyanide, lead nitrate and sodium hypochlorite as well as other subsidiary medicines in complex ore pre-treatment does not reject golden cicada gold leaching;
⑥a little of black slag generated after dissolution of golden cicada will not affect the leaching effect;
⑦golden cicada and sodium cyanide will not reject each other when being used at the same time;
⑧gold leaching by cip (carbon-in-plup) process and the “rich-oxygen leaching” have bad impact on golden cicada.
ii detection method of jinchan concentration (titration)
1.necessary instruments: one 50 ml conical flask, two 10 ml pipettes and 1 red head dropper;
2.reagent preparation: (reagents shall be stored in brown glass bottles to avoid heat and light);
①indicator: put a whole bottle of reagent (rhodanine) into 500 ml acetone solution. stir them until they are totally dissolved and set them aside;
②testing reagent: put a whole bottle of reagent (silver nitrate) into 1,000 ml distilled water. stir them until they are totally dissolved and set them aside.
①put 10 ml solution to be tested into a 50 ml conical flask and drop 5 drops of indicator into the bottle and shake it up (yellow);
②intake 10 ml detection reagent with pipette to implement titration; shale the bottle up while dropping during the titration. at the same time, observe the color change in liquid. the pink color refers to the end point. read the consumption of detection reagent which has been used (namely ml);
③conversion results: jinchan concentration≈[ consumed detection reagent as (ml)/2 ] ׉
ossible to add a little of calcium chlorate (bleaching powder) and ferrous sulfate for treatment, then discharge and stack them in special tailing facilities.
iv product transportation and storage: