阅读说明：本技术 Boc体系溶液、其制备方法及浸金、冶金方法 (BOC system solution, preparation method thereof, gold leaching method and metallurgy method ) 是由 杨炯 于 2020-06-04 设计创作，主要内容包括：本发明公开了一种BOC体系溶液、其制备方法及浸金、冶金的方法,旨在解决现有提金技术适用性差、有毒不环保的技术问题。本发明BOC体系溶液由溴盐、氧化剂、络合剂制成。本发明提供了一种所述BOC体系溶液的制备方法；本发明还提供一种从矿石中浸出金的方法。本发明BOC体系溶液中溴盐可循环利用,尾矿无须特殊处理。本发明采用非氰无毒试剂,环境友好；常温、常压下操作,安全可靠；适应高海拔地区缺氧环境；浸出速度较快,生产周期短；尾矿无须特殊处理；适用范围广。(The invention discloses a BOC system solution, a preparation method thereof and a gold leaching and metallurgy method, and aims to solve the technical problems of poor applicability, toxicity and no environmental protection of the existing gold extraction technology. The BOC system solution is prepared from bromine salt, an oxidant and a complexing agent. The invention provides a preparation method of the BOC system solution; the invention also provides a method for leaching gold from ore. The bromine salt in the BOC system solution can be recycled, and the tailings do not need special treatment. The invention adopts non-cyanogen non-toxic reagent, which is environment-friendly; the operation is carried out at normal temperature and normal pressure, and the operation is safe and reliable; the method is suitable for the anoxic environment of high-altitude areas; the leaching speed is high, and the production period is short; the tailings do not need special treatment; the application range is wide.)

1. A BOC system solution is characterized by containing 0.03-0.25 mol/L of bromine salt, 0.01-0.15 mol/L of oxidant and 0.1-0.6 mol/L of complexing agent.

2. The BOC system solution of claim 1, wherein the bromine salt is NaBr or/and KBr.

3. The BOC system solution of claim 1, wherein the oxidant is ClO₂。

4. The BOC system solution of claim 1, wherein the complexing agent is Cl^-And (3) a complexing agent.

5. The BOC system solution of claim 4, wherein the Cl is^-The complexing agent is NaCl or NH₄Cl、MgCl、KCl、CaCl₂At least one of (1).

6. A method of preparing the BOC system solution of claim 1, comprising the steps of:

dissolving the bromine salt and the complexing agent in the solution according to claim 1, mixing, adding the oxidant, uniformly stirring, and standing for 1-2 hours.

7. A method of leaching gold from an ore, comprising the steps of:

(1) according to the weight ratio of 1 t: 2.5 to 3.5 m³Mixing the ore to be extracted and the BOC system solution of claim 1 uniformly;

(2) oscillating for 0.8-1.5 h at 5-35 ℃ and pH 4-8, standing for 0.8-1.5 h, and repeatedly treating for 4-24 h;

(3) and carrying out solid-liquid separation to obtain the gold leaching solution.

8. A method of leaching gold from ore according to claim 7 wherein, in step (1), when the gold of the ore is present to contain bright gold and/or sulphide-coated gold, a pretreatment by reselection, roasting and/or pre-oxidation is applied; the particle size of the bright gold is more than 100 mu m.

9. A metallurgical process, comprising the steps of:

taking the gold leaching solution obtained in the claim 7, extracting gold mud, and smelting to obtain a gold product.

10. The metallurgical method according to claim 9, wherein the method for extracting gold mud is any one of activated carbon adsorption or desorption, active metal reduction and inorganic or organic reducing agent reduction.

Technical Field

The invention relates to the technical field of metal extraction, in particular to a BOC system solution, a preparation method thereof and a gold leaching and metallurgy method.

Background

The cyanidation method has been practiced for more than 100 years, has mature process, strong adaptability to ores and high gold recovery rate, and is still the main method for leaching gold. However, cyanide is extremely toxic, and has applicability problem for refractory metallurgical ore resources such as high arsenic and high antimony, and non-cyanide technology is safe and environment-friendly, and has unique advantages in development of refractory metallurgical ore resources and improvement of resource utilization rate, so non-cyanide gold extraction technology research is always carried out.

At present, developed biological agent methods, thiosulfate methods, high-temperature chlorination methods, sodium hypochlorite methods, polysulfide methods, iodine methods and the like are greatly developed, but the methods are not mature enough, have poor adaptability to different ores, and have some problems which are not easy to solve in the production process, such as: the thiourea method is high in gold dissolving speed, but the temperature range is narrow (35-60 ℃), due to the fact that leaching is carried out under the acidic condition, the ore adaptation type limitation is large, meanwhile, thiourea can be hydrolyzed when being heated in an acidic (or alkaline) solution, and the hydrolysis loss consumption of the thiourea is high; the polysulfide method for leaching gold has the disadvantages of quite high required medicament concentration and great consumption, and the leaching rate of gold is small and is only 80 percent; the liquid chlorination method adopts chlorine water or a solution of sulfuric acid and bleaching powder to leach gold from ores, and ferrous sulfate is used for precipitating gold from a leaching solution, which is one of the main gold leaching methods at the end of the 19 th century, and is replaced by a cyanidation method due to transportation and storage of liquid chlorine, inevitable air pollution and other reasons; bromine used in bromine leaching is a dense fuming red liquid, bromine can be added into a leaching solution from the outside or can be generated on site, but the traditional method for generating bromine on site needs acidification pretreatment, the solution is high in acidity, the adaptability of ore types is limited, and bromine vapor has strong corrosivity; other methods also have environmental problems of high cost or secondary pollution, resulting in limited application in practical industrial production.

Therefore, no excellent non-cyanogen gold extraction technology which can be popularized and applied exists in the prior art.

Disclosure of Invention

The invention aims to solve the technical problems of poor applicability, toxicity and no environmental protection of the existing gold extraction technology by providing a BOC system solution, a preparation method thereof and a gold leaching and metallurgy method.

In order to solve the technical problems, the invention adopts the following technical scheme:

a BOC system solution is designed, and contains 0.03-0.25 mol/L of bromine salt, 0.01-0.15 mol/L of oxidant and 0.1-0.6 mol/L of complexing agent.

Preferably, the bromine salt is NaBr or/and KBr.

Preferably, the oxidant is ClO₂。

Preferably, the complexing agent is Cl^-And (3) a complexing agent.

Further, in the above-mentioned case,the Cl^-The complexing agent is NaCl or NH₄Cl、MgCl、KCl、CaCl₂At least one of (1).

A preparation method of the BOC system solution is provided, and comprises the following steps:

and dissolving and mixing the bromine salt and the complexing agent, adding the oxidant, uniformly stirring, and standing for 1-2 hours to obtain the bromine-containing water-soluble organic acid.

There is also provided a method of leaching gold from an ore, comprising the steps of:

(1) according to the weight ratio of 1 t: 2.5 to 3.5 m³Mixing the ore to be extracted and the BOC system solution uniformly;

(2) oscillating for 1 hour at the temperature of 5-35 ℃ and the pH value of 4-8, standing for 1 hour, repeatedly oscillating, and standing for 4-24 hours;

(3) and carrying out solid-liquid separation to obtain the gold leaching solution.

Preferably, in the step (1), when the gold of the ore exists to contain bright gold and/or sulfide-containing coated gold, the ore is pretreated by reselection, roasting and/or pre-oxidation; the particle size of the bright gold is more than 100 mu m.

Also provided is a metallurgical method, comprising the following steps:

and (4) taking the obtained gold leaching solution, extracting gold mud, and smelting to obtain a gold product.

Preferably, the method for extracting the gold mud is any one of activated carbon adsorption or desorption, active metal reduction and inorganic or organic reducing agent reduction.

Compared with the prior art, the invention has the main beneficial technical effects that:

1. the BOC system is a non-cyanogen non-toxic reagent and is environment-friendly; the operation is carried out at normal temperature and normal pressure, the safety and the reliability are realized, and the energy consumption is saved; the application condition is wide and is suitable for the anoxic environment in high altitude areas; the leaching speed is high, and the production period is short; the tailings do not need special treatment.

2. The bromine salt in the BOC system solution can be recycled, and the tailings do not need special treatment.

3. The method can be used for directly extracting the gold in the ore which is in a particle grade or a sub-particle grade, and for the ore which is wide in particle grade distribution, large in particle size and contains sulfide coated gold, the gold contains bright gold (the particle size is more than 100 mu m), and the gold can be extracted after being pretreated by adopting the measures of conventional reselection, roasting, pre-oxidation and the like, so that the application range is wide.

Drawings

FIG. 1 shows different concentrations of oxidizing agent ClO₂Gold leaching (V%) of the treated samples.

FIG. 2 is a graph of gold leaching (V%) for various concentrations of the bromide salt NaBr treated samples.

FIG. 3 shows gold leaching rates (V%) for samples treated with different concentrations of complexing agent NaCl.

Fig. 4 shows the gold leaching rate (V%) for the samples treated at different leaching times (t).

Detailed Description

The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.

The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the related reagents are all conventional reagents in the market, if not specifically indicated; the test methods involved are conventional methods unless otherwise specified.

The invention researches a method for dissolving gold from ore by using a non-toxic and harmless Bromine salt, oxidant and complexing agent solution system (BOC system for short).