Normal temperature and pressure quick desorption electrolysis method of gold loaded carbon

Abstract

The invention discloses a normal pressure quick desorption electrolysis method of gold loaded carbon, comprising the following steps: a desorption agent containing 2-5% of sodium hydroxide and 5-10% of an auxiliary desorption agent isopropanol is subjected to heating cycle in an entire process system through pumps; the desorption temperature is 80 DEG C and the pressure is 0.1MPa;the gold loaded carbon is desorbed so that the gold enters eluent in the form of complex ions to obtain pregnant solution; the pregnant solution enters an electrolyzer and undergoes electrochemical reaction in the presence of applied voltage so that the gold is deposited and precipitated at the cathode, thus recycling the gold; electrolyzed desorption solution reaches the desorption temperature of 80 DEG C after a heater supplies energy and then circularly passes through the gold loaded carbon to elute the gold in cycles until the concentration of the gold in the pregnant solution is lower than 1-2g / L, then the desorption electrolysis process is completed; the desorption time is only 8-10h; the desorption solution can be reused and can be replenished with the sodium hydroxide and the auxiliary desorption agent isopropanol each time according to the conditions to ensure the concentration of the desorption solution; after being cycled for multiple times, the desorption solution is recycled or processed by purification devices; the desorption solution contains no cyanide, thereby realizing efficient, environment-friendly and clean production.

Description

technical field [0001] The invention relates to a rapid desorption electrolysis method for gold-carrying carbon in gold mines under normal pressure. Background technique [0002] The gold-loaded carbon desorption processes currently used in the market and mines are divided into three categories according to temperature and pressure: normal pressure and normal temperature desorption electrolysis, high temperature and medium pressure desorption electrolysis, and high temperature desorption low temperature electrolysis. [0003] Normal pressure and normal temperature desorption electrolysis process for gold-loaded carbon, the desorption temperature is 95-100°C, normal pressure, the pressure is 0.1MPa, the desorption liquid is sodium cyanide (NaCN) 2% + sodium hydroxide (NaOH) 1%, the desorption cycle is More than 36 hours, its advantages are: small equipment investment, safe operation; disadvantages: long desorption time, low production efficiency, high energy consumption. [...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of large carbon wear, large investment in equipment, fine operation requirements, high energy consumption, and high production cost in the existing heating and ballasting gold-carbon desorption electrolysis process, and to solve the problem of desorption of gold-carbon with normal ballast. The electrolysis process has the problems of long desorption time and low production efficiency, and a rapid desorption electrolysis method for gold-loaded carbon under normal pressure is provided. The desorption liquid used in this method does not contain cyanide, which realizes high efficiency, environmental protection and clean production.

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