Refinement technology of high-purity gold

Refinement technology of high-purity gold

  • CN 104,789,794 A
  • Filed: 04/01/2015
  • Published: 07/22/2015
  • Est. Priority Date: 04/01/2015
  • Status: Active Application
First Claim
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1. a High Purity Gold refinery practice, comprises the following steps:

  • 1) ingot efflorescence;

    ingot efflorescence is obtained gold mud;

    2) preimpregnation removal of impurities;

    gold mud and hydrochloric acid soln are poured in reaction vessel respectively, solid-to-liquid ratio is 4 ~ 5;

    1, and the concentration of hydrochloric acid is 20 ~ 31v/v%, and the reaction conditions of preimpregnation removal of impurities is;

    pH value in reaction 0.5 ~ 0.7, temperature of reaction is 70 ~ 85 DEG C, and the reaction times is 3 ~ 5 hours;

    After preimpregnation terminates, reaction product is washed, filter, collect filter cake for subsequent use;

    3) chlorination leaching gold;

    add using hydrochloric acid as leaching agent in the filter cake of previous step, the solid-to-liquid ratio of filter cake and hydrochloric acid is 3 ~ 4;

    1, the concentration of hydrochloric acid is 175 ~ 225g/L, and pass into chlorine and carry out chlorination leaching gold reaction, chlorine consumption is 0.75 ~ 0.85kg/kg au, the reaction conditions of a chlorine leaching is;

    pH value 0 ~ 0.5, temperature of reaction 85 ~ 90 DEG C, 5 ~ 10 hours reaction times;

    Reaction terminates rear reaction mixture and is cooled to 30 ~ 40 DEG C, filters, gets filtrate and react for next step;

    4) once reduce;

    the pH value being adjusted previous step filtrate by alkaline matter is 0 ~ 0.5, slowly adds reductive agent NaHSO 3solution, NaHSO 3the concentration of solution is 450g/L, reductive agent NaHSO 3the consumption of solution and the weight ratio of ingot raw material are 1.63;

    1, and the Eo+ of adjustment reaction solution is that 690 ~ 700mV reduces, and electrolysis temperature is 55 ~ 57 DEG C, and the recovery time is 2.5 ~ 3.5 hours;

    After reaction terminates, collect the once reduction gold bottom reactor;

    5) secondary chlorination leaching gold;

    add in the once reduction gold of previous step using hydrochloric acid as leaching agent, gold is 3 ~ 4;

    1 with the solid-to-liquid ratio of hydrochloric acid, concentration of hydrochloric acid is 175 ~ 200g/L, and pass into chlorine and carry out secondary chlorination leaching gold reaction, the consumption of chlorine is 0.5 ~ 0.6kg/kg au, the reaction conditions of secondary chlorine leaching is;

    temperature of reaction is 85 ~ 90 DEG C, and the reaction times is 5 ~ 8 hours;

    The leaching of secondary chlorine terminates rear reaction mixture and is first warming up to 100 ~ 110 DEG C, insulation 25 ~ 35min, and then mixture is cooled to 30 ~ 35 DEG C, filters, gets filtrate and react for next step;

    6) secondary reduction;

    the pH value being adjusted previous step filtrate by alkaline matter is 0 ~ 0.5, slowly adds the reductive agent NaHSO that concentration is 450g/L 3solution, in secondary reduction reaction, the consumption of reductive agent is 85 ~ 90wt% of reductive agent consumption in a reduction reaction;

    The Eo+ of adjustment reaction solution is that 700 ~ 710mV reduces, and electrolysis temperature is 55-57 DEG C, and the recovery time is 2.5 ~ 3.5 hours;

    After reaction terminates, the secondary reduction gold collected bottom reactor is High Purity Gold product.

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