CN101818258A

CN101818258A - Method for quickly leaching gold and silver by using mixed leaching agent

Info

Publication number: CN101818258A
Application number: CN 201010167103
Authority: CN
Inventors: 梁伟基; 梁增扬
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-10
Filing date: 2010-05-10
Publication date: 2010-09-01
Anticipated expiration: 2030-05-10
Also published as: CN101818258B

Abstract

The invention discloses a method for quickly leaching gold and silver by using a mixed leaching agent, which comprises the following steps of: crushing gold-containing pyrite smelting slag, a sulfide-containing visible gold ore or/and a gold-containing oxidized ore serving as raw materials, conditioning the raw materials with water to form slurry, adding ammonium thiocyanate, thiocarbamide, urea and an oxidant, namely manganese dioxide or ferric chloride, into the ore slurry and stirring and leaching the mixed slurry to leach the gold and silver out. The method has the advantage that: the mixed leaching agent formed by adding the urea into the ammonium thiocyanate can quickly leach the gold and the silver out of the sulphur and arsen-containing gold ore by adding the urea with a low cost, particularly the gold and the silver which are contained in pyrolusite can be leached out with a lower cost. At the same time, beneficial elements in the ores can be comprehensively used.

Description

A kind of method of quickly leaching gold and silver by using mixed leaching agent

Technical field

The invention belongs to hydrometallurgical technology, specifically is to add the method for thiocarbamide from the kustelite of sulfur-bearing arsenic or the kustelite rapid extraction gold and silver the oxidized ore with ammonium thiocyanate or thiocyanate-.

Background technology

At present, method of extracting gold and silver and few from sulfur-bearing arsenic kustelite, except that cyanide process, other method drug concentration is all very high, so that cost increases.For example; Sulphur cyanogen method; The concentration of thiocyanate-must reach 5% leaching yield that just can reach about 90% in the aqueous solution of thiocyanate-.If mine tailing then can bring to environment to have a strong impact on not sterile-processed.Otherwise be exactly the leaching condition harshness, be difficult to promote aborning.As thiocarbamide, single to soak gold and silver concentration with thiocarbamide also higher, and be easy to problems such as oxidation.Water-chlorine process leaches the high kustelite of sulfur-bearing then loses more than gain especially.Therefore, the present invention will solve cyanide process exactly, and to soak golden toxicity big, slow-footed problem.Other soaks golden method drug concentration height, the difficult problem of condition harshness.

Summary of the invention

In order to overcome the deficiencies in the prior art, the invention provides a kind of method of quickly leaching gold and silver by using mixed leaching agent.

The technical scheme that the present invention solves the art technical problem is as follows:

A kind of method of quickly leaching gold and silver by using mixed leaching agent,, add thiocarbamide with ammonium thiocyanate and in the aqueous solution of pH0.5, add urea and oxygenant Manganse Dioxide or iron trichloride and make leaching agent and extract gold and silver in the ore or/and auriferous oxidized ore is a raw material with auriferous pyrite cinder, the visible gold mine of Containing Sulfur.The concrete operations step is as follows:

1. ore is milled to 120～300 orders;

2. water is sized mixing by 3: 1 pairs of levigate ores of solvent and solute weight ratio, obtains ore pulp;

3. ore pulp is pumped in the reactor of band stirring, put into sulfuric acid and regulate pH values of pulp 0.5, add 0.1～1% ammonium thiocyanate, 0.1～0.5% thiocarbamide and 0.1～0.5% urea of the water weight of sizing mixing; 1～5% oxygenant Manganse Dioxide or the iron trichloride that adds ore deposit weight;

4. agitation leach is 4 hours, and the sulphide ores leaching yield reaches 95%, and the oxidized ore leaching yield reaches 97%;

5. recovery can be replaced or adsorb to the gold and silver in your liquid according to a conventional method.

The present invention has following advantage compared with the prior art:

1. by adding protective material urea, can leach the gold and silver in the sulfur-bearing arsenic gold mine cheaply fast.Play key effect to reducing thiocarbamide and the consumption concentration of thiocyanate-in immersion liquid; And urea is with low cost nontoxic.

2. contained gold and silver in oxidized ore and the pyrolusite particularly, it is more cheap to leach cost, can also fully utilize the beneficial element in the ore simultaneously.

3. owing to greatly reduce the consumption of thiocyanate-, tailings discharging can not impact environment.

4. the present invention is no matter be the sulphide ores Gold Ore, or the oxidized ore Gold Ore, through baked parcel Gold Ore etc., can both leach gold and silver fast, and leaching yield is high.

5. the present invention has ease for operation, and production environment is gentle.Do not resemble problems such as water-chlorine process chlorine is difficult to control and cyanide process mine tailing toxicity is big, working condition is easy to advantages such as control.

Embodiment

Add the mixing leaching agent that thiocarbamide forms with ammonium thiocyanate,, can leach the gold and silver in the sulfur-bearing arsenic gold mine cheaply fast by adding urea.The gold and silver that contains in the pyrolusite particularly, cost is more cheap, can also fully utilize the beneficial element in the ore simultaneously.

Below in conjunction with embodiment the present invention is further described.But need to prove that embodiment does not constitute the restriction to claim protection domain of the present invention.

Embodiment one

10 kilograms of the sulfate slags of Hengyang City, Hunan vitriol works, its principal element content of slag is as follows; Sulphur 3%, arsenic 2%, iron 30%, gold 5 gram/tons, silver 30 gram/tons.

Wash and starch lixiviation process with all sliming cyanidation carbon

Sulfate slag is milled to 300 orders, washes and starches with all sliming cyanidation carbon and leached 48 hours, leaching yield only reaches about 35%.Mine tailing contains about gold 3 gram/tons, silver 20 gram/tons.Belong to the refractory mineral type.

Leach with this law the inventive method;

1. sulfate slag is milled to 300 orders.

2. by the liquid-solid ratio agitation leach of sizing mixing at 3: 1.

3. regulate pH values of pulp 0.5 with sulfuric acid; In ore pulp, put into 0.3 kilogram of ammonium thiocyanate, 0.15 kilogram of sulphur

Urea, 0.09 kilogram of urea and 0.5 kilogram of Manganse Dioxide.

4. agitation leach is 4 hours, and gold leaching rate reaches 95%, and mine tailing contains gold 0.25 gram/ton, silver leaching rate 93%, mine tailing argentiferous 2.1 gram/tons.

Embodiment two;

10 kilograms in somewhere, Hezhou City, Guangxi gold mine sample, its principal element content is as follows; Sulphur 15%, arsenic 1.5%, gold 12.5 gram/tons, the gold mine type belongs to as seen gold of quartz vein.Silver 300 gram/tons,

Leach with this law;

1. Gold Ore is milled to 200 orders,

2. by the liquid-solid ratio agitation leach of sizing mixing at 3: 1

3. regulate pH values of pulp 0.5 with sulfuric acid,, in ore pulp, put into 0.3 kilogram of ammonium thiocyanate, 0.15 kilogram of thiocarbamide, 0.09 kilogram of urea and 0.5 kilogram of Manganse Dioxide.

4. agitation leach is 4 hours, and gold leaching rate reaches 95%, and mine tailing contains gold 0.65 gram/ton, silver leaching rate 95%, mine tailing argentiferous 15 gram/tons.

Embodiment three;

100 kilograms of Baise of Guangxi gold mine mountain oxidized ores, constituent content is as follows; Sulphur 0.5%, arsenic 1.5%, gold 3.5 gram/tons, silver 8.5 gram/tons,

1. Gold Ore is milled to 120 orders,

2. by liquid-solid ratio 3; 1 agitation leach of sizing mixing

3. regulate pH values of pulp 0.5 with sulfuric acid, in ore pulp, put into 0.3 kilogram of ammonium thiocyanate, 0.3 kilogram of thiocarbamide, 0.3 kilogram of urea and 1 kilogram of Manganse Dioxide.

3. agitation leach is 4 hours, and gold leaching rate reaches 95%, and mine tailing contains gold 0.18%, silver leaching rate 93%, mine tailing argentiferous 0.6 gram/ton.

Claims

1. the method for a quickly leaching gold and silver by using mixed leaching agent, with auriferous pyrite cinder, the visible gold mine of Containing Sulfur or/and auriferous oxidized ore is a raw material, it is characterized in that, add thiocarbamide with ammonium thiocyanate and add urea and oxygenant Manganse Dioxide or iron trichloride make leaching agent and extract gold and silver in the ore in the aqueous solution of pH0.5, the concrete operations step is as follows:

1) ore is milled to 120～300 orders;

2) water is sized mixing by 3: 1 pairs of levigate ores of solvent and solute weight ratio, obtains ore pulp;

3) ore pulp is pumped in the reactor of band stirring, put into sulfuric acid and regulate pH values of pulp 0.5, add 0.1～1% ammonium thiocyanate, 0.1～0.5% thiocarbamide and 0.1～0.5% urea of the water weight of sizing mixing; 1～5% oxygenant Manganse Dioxide or the iron trichloride that adds ore deposit weight;

4) agitation leach is 4 hours, and the sulphide ores leaching yield reaches 95%, and the oxidized ore leaching yield reaches 97%;

5) recovery can be replaced or adsorb to the gold and silver in your liquid according to a conventional method.