CN1044619C

CN1044619C - Method for extraction of gold from coal-oil gold-carried aggregate (gold chamber)

Info

Publication number: CN1044619C
Application number: CN95121617A
Authority: CN
Inventors: 冯明昭; 王菊芳; 马安民; 刘风英
Original assignee: Xinjiang Technical Institute of Physics and Chemistry of CAS
Current assignee: Xinjiang Technical Institute of Physics and Chemistry of CAS
Priority date: 1995-12-29
Filing date: 1995-12-29
Publication date: 1999-08-11
Anticipated expiration: 2015-12-29
Also published as: CN1153219A

Abstract

The present invention relates to a method for extracting gold from the coal-oil agglomerates carrying gold to recover gold, which adopts extracting solution prepared by the complexing of a complex compound, a catalyst, an oxidizing agent, an additive agent, a protective agent and a pH modifying agent to extract gold. Gold, silver and copper in the extracting solution (pregnant solution) is deposited by a reducing agent, and the deposited matter is filtered; then, the filtered deposited matter is calcined and desulfurized; the gold is separated out by nitric acid; powdered gold is smelted into ingot; copper nitrate is recovered by the filtrate; silver is contained in the filtrate, and the silver is deposited and recovered by sodium chloride in advance. The method which has the advantages of simple equipment and the avoidance of the toxic pollution of an organic solvent; fine gold particles can be prevented from escaping along with air currents at the time of processing by a calcining method, so the total recovery rate of gold reaches more than 95 to 99%. The present invention is a new method for the recovery of gold.

Description

Method for releasing gold in coal-oil gold-loaded agglomerates

The present invention belongs to a method for recovering gold

The invention discloses a post-treatment method of ZL9111642.2 gold-carrying agglomerates, which removes carbon and oil by a combustion method and then carries out smelting by a pyrometallurgical method or a pyrometallurgical method to obtain alloy gold. The gold can also be roasted at the temperature of 550 plus 650 ℃, carbon and oil are removed by burning, gold is recovered by a wet method by using a chlorination method after roasting ash is reground, but the treatment temperature after the burning method is not easy to control, fine-grained gold is easy to escape along with air flow, strict dust collection equipment is required to reduce loss, a CARBAO method is adopted abroad, the equipment investment is large, heavy liquid with organic solvent has high toxicity, the operation is inconvenient, and the method is not suitable for small and medium-sized gold agglomeration method gold extraction plants. The invention develops a method for releasing gold from coal-oil gold-loaded aggregates on the basis of ZL 91112642.2.

The invention aims to provide a method for releasing gold in coal-oil gold-loaded agglomerates, which is mainly used for releasing gold by adopting a releasing liquid compounded by a complexing agent, a catalyst, an oxidant, an additive, a protective agent and a pH regulator. The process flow is as follows: gold removing liquid → precipitation → gold separation by nitric acid → filtration → gold → recovery of copper and silver in the filtrate. The method has simple equipment, the gold recovery rate reaches more than 98 percent, and the method is suitable for small and medium size gold extraction plants by a coal-oil agglomeration method.

The principle of the method for releasing gold in the coal-oil gold-loaded agglomerate is that gold particles in the gold-loaded agglomerate can be catalytically oxidized by copper ammine complex ions in an alkaline medium, and form a complex with a complexing agent in the presence of an additive and a protective agent to enter a water phase, micropores and capillary tunnels in the agglomerate are filled with an oil phase, and the adsorption capacity on thiosulfate complex anions of gold with larger ionic radius is lost, so that agglomerated free gold and continuous gold in a gold chamber can be quantitatively released, and the reaction formula is as follows:

the invention relates to a method for releasing gold in coal-oil gold-loaded agglomerates, which mainly comprises the steps of (8) smashing the gold-loaded agglomerates to 60-80 meshes, naturally drying the gold-loaded agglomerates to be dried at low temperature, adding a compound releasing liquid for releasing, wherein the solid-to-liquid ratio of the compound releasing liquid is 1: 4-8, the compound releasing liquid uses sodium thiosulfate and ammonium thiosulfate as complexing agents, the concentration is 0.25-0.5mol/l, one of cuprammonium salt, copper sulfate and copper nitrate is used as a catalyst, and the concentration is 0.05-0.1 mol/l; one of sodium peroxide, hydrogen peroxide, oxygen and air is taken as an oxidant, the concentration is 0.01-0.03mol/l, and one of citrate, sodium ethylenedioxytetracetate and urea is taken as an additive, the concentration is 0.03-0.06 mol/l; one of sodium sulfite and ammonium sulfate is used as a protective agent, and the concentration is 0.02-0.1 mol/l; one of ammonium hydroxide, sodium hydroxide and sodium carbonate is used as a pH regulator, and the pH value is 9.5-10.5; and (3) preparing a compound stripping solution. (b) The temperature of the prepared compound releasing liquid is controlled between 45 ℃ and 55 ℃, the releasing time of the closed container is 4 to 8 hours under positive pressure, the stirring intensity is 100-200rpm/min, and the reaction container is a glass lining reaction kettle. (c) Depositing gold, silver and copper by using crystallized sodium sulfide and one of sodium hydrosulfite as a reducing agent in the gold in the desorbed pregnant solution, filtering the deposit, roasting for desulfurization, separating gold by using nitric acid, smelting gold powder into ingots, and recovering copper nitrate from the filtrate; silver contained in the filtrate was previously recovered by sodium chloride precipitation. The gold-carrying agglomerate contains aluminum, iron, calcium, etc. and is pre-treated with 1-2mol/l hydrochloric acid and crushed into 60-80 mesh gold chamber, leached at normal temperature or warm condition for 1-2 hr to eliminate the attached hydroxide film of aluminum, iron, calcium, etc. in the gold chamber, filtered to clean the gold chamber with water to subacidity and neutralized with dilute ammonia water to subalkaline. The agglomeration of sulfide inclusion gold remained in the gold room adopts a method of agglomerating gold and its intergrowth by 91112642.2 coal-oil agglomeration, and can be reused after adding diesel oil, when the sulfide inclusion and impurities are more, the ash content is more than 20%, and the residual inclusion gold needs to be firstly treated by a combustion method to be recovered.

Example (b):

smashing coal-oil gold-loaded agglomerates (with gold loading of 1000-plus 5000g/l) prepared from quartz vein oxidation type gold oreto 60-80 meshes, adding the smashed coal-oil gold-loaded agglomerates into a glass lining reaction kettle, adding any one of complexing agent, any one of catalyst, any one of oxidant, any one of additive, any one of protective agent and any one of pH regulator into a composite stripping liquid according to a solid-to-liquid ratio of 1: 4-8, carrying out closed stirring leaching for 4-8 hours at 45-55 ℃, cooling to room temperature, absorbing tail gas by water to recover ammonia, filtering pregnant solution, adding any one of reducing agent into the pregnant solution, uniformly stirring, standing overnight, filtering to deposit gold, silver and copper, roasting and desulfurizing deposits, separating gold by nitric acid, smelting gold powder into ingots, recovering copper nitrate from filtrate after gold separation, and depositing silver in the filtrate by sodium chloride in advance to recover silver. The gold in the gold chamber is desorbed with a recovery rate of more than 95-99%, and the agglomerate after gold desorption can be made into agglomerate for recycling by supplementing diesel oil. The gold-carrying agglomerate contains aluminum, iron and calcium, and is pre-treated with 1-2mol/l hydrochloric acid, crushed into 60-80 mesh gold chamber, leached for 1-2 hr at normal temperature or warm condition to eliminate the attached hydroxide film of aluminum, iron, calcium, etc. in the gold chamber, filtered, water washed to slightly acidic, and diluted ammonia water neutralized to slightly basic.

Claims

1. A method for gold desorption in coal-oil gold-loaded agglomerates is characterized by comprising the following steps:

(a) smashing gold-loaded agglomerates to 60-80 meshes, naturally drying to low temperature and drying, adding a compound stripping solution for stripping, wherein the solid-liquid ratio is l: 4-8, the compound stripping solution takes one of sodium thiosulfate and ammonium thiosulfate as a complexing agent, the concentration is 0.25-0.5mol/l, one of copper ammonia chromate, copper sulfate and copper nitrate as a catalyst, and the concentration is 0.05-0.1 mol/l; one of sodium peroxide, hydrogen peroxide, oxygen and air is taken as an oxidant, the concentration is 0.01-0.03mol/l, and one of citrate, sodium ethylenedioxytetracetate and urea is taken as an additive, the concentration is 0.03-0.06 mol/l; one of sodium sulfite and ammonium sulfate is used as a protective agent, and the concentration is 0.02-0.1 mol/l; one of ammonium hydroxide, sodium hydroxide and sodium carbonate is used as a pH regulator, and the pH value is 9.5-10.5; preparing a compound stripping solution;

(b) the temperature of the prepared compound releasing liquid is controlled between 45 ℃ and 55 ℃, the releasing time of the closed container is 4 to 8 hours under positive pressure, the stirring intensity is 100-;

(c) gold in the desorbed pregnant solution is deposited with gold, silver and copper by using one of crystallized sodium sulfide and sodium hydrosulfite as a reducing agent, the deposit is filtered, the gold is separated by nitric acid for roasting and desulfuration, gold powder is smelted into ingots, and copper nitrate is recovered from the filtrate; silver contained in the filtrate was previously recovered by sodium chloride precipitation.

2. The method according to claim 1, wherein the gold-loaded agglomerate contains aluminum, iron, calcium, etc., and is crushed into a 60-80 mesh chamber by 1-2mol/l hydrochloric acid pretreatment, leached for 1-2 hours at normal temperature or warm temperature to remove the hydroxide film of aluminum, iron, calcium, etc. attached to the chamber, and then the chamber is washed with water to be slightly acidic, and then neutralized with dilute ammonia water to be slightly alkaline.

3. The method of claim 1 or 2, wherein the agglomerate of sulfide inclusion gold remaining in the gold room is made by agglomerating gold and its consortium with coal-oil agglomerate, and can be reused after adding diesel oil, and the ash content is more than 20% when there are more sulfide inclusion and impurities in the agglomerate, and the residual inclusion gold is recovered by post-combustion treatment.