阅读说明：本技术 一种采用微生物从含锌铜精矿中选择性脱锌的方法 (Method for selectively removing zinc from zinc-containing copper concentrate by adopting microorganisms ) 是由 张雁生 赵红波 吕鑫 孙欣 邱冠周 于 2019-10-17 设计创作，主要内容包括：本发明涉及一种采用微生物从含锌铜精矿中选择性除锌的方法,包括以下步骤：将含锌铜精矿进行预处理,将预处理后的含锌铜精矿制备为矿浆,向所述矿浆中接种浸矿微生物,并加入营养物质,然后进行搅拌浸出,将浸出后的矿浆固液分离,得到选择性除锌后的低锌高品位铜精矿和含锌浸出液。本发明浸出处理后通过固液分离即可获得高品位的目的精矿,得到的滤液又可作为金属锌的生产原料,最大限度地提高了经济效益；本发明方法流程短,效率高,是一种清洁高效的多元素综合利用工艺,易于大规模工业生产。(The invention relates to a method for selectively removing zinc from zinc-containing copper concentrate by using microorganisms, which comprises the following steps: the method comprises the steps of pretreating zinc-containing copper concentrate, preparing the pretreated zinc-containing copper concentrate into ore pulp, inoculating ore leaching microorganisms into the ore pulp, adding nutrient substances, stirring and leaching, and carrying out solid-liquid separation on the leached ore pulp to obtain low-zinc high-grade copper concentrate subjected to selective zinc removal and zinc-containing leachate. According to the invention, high-grade target concentrate can be obtained through solid-liquid separation after leaching treatment, and the obtained filtrate can be used as a production raw material of metal zinc, so that the economic benefit is improved to the maximum extent; the method has short flow and high efficiency, is a clean and high-efficiency multi-element comprehensive utilization process, and is easy for large-scale industrial production.)

1. A method for selectively removing zinc from a zinc-bearing copper concentrate using microorganisms, comprising the steps of:

(1) Pretreating zinc-containing copper concentrate;

(2) Preparing the zinc-containing copper concentrate after pretreatment into ore pulp;

(3) Inoculating ore leaching microorganisms into the ore pulp, adding nutrient substances, and then stirring and leaching;

(4) And carrying out solid-liquid separation on the leached ore pulp to obtain the low-zinc high-grade copper concentrate and the zinc-containing leaching solution after selective zinc removal.

2. the method according to claim 1, wherein in step (1), the zinc grade of the zinc ~ containing copper concentrate is lower than 22%, and the copper grade is 16% ~ 33%.

3. The method of claim 1, wherein: in the step (1), the pretreatment method comprises concentrate regrinding and reagent removal, and the granularity of the treated ore is less than or equal to 0.1mm and accounts for more than 99%.

4. The method of claim 1, wherein: in the step (2), the concentration of the ore pulp is less than or equal to 30%.

5. The method of claim 1, wherein: in the step (3), the nutrient substances are soluble salt containing ferrous iron, nitrogen, phosphorus, potassium, magnesium and calcium and elemental sulfur.

6. the method of claim 1, wherein: in the step (3), the microorganism is one or more of acidithiobacillus ferrooxidans, leptospirillum ferrooxidans and leptospirillum ferriphilum.

7. the method according to claim 1, characterized in that in the step (3), the pH of the ore pulp is adjusted to be less than or equal to 5.0 during leaching, and the temperature during leaching is controlled to be 20 ~ 90 ℃.

8. the method according ~ claim 1, wherein the stirring speed in the step (3) is 15 ~ 750 rpm.

9. the method according to claim 1, wherein in the step (3), the potential of a leaching system in the agitation leaching process is controlled to be 350 ~ 850mV relative to a saturated silver/silver chloride electrode.

10. The method of claim 1, wherein: in the step (3), the stirring leaching time is more than or equal to 0.5 h.

Technical Field

The invention relates to the field of hydrometallurgy and mineral processing, in particular to a method for selectively removing zinc from zinc-containing copper concentrate by adopting microorganisms.

background

Copper is one of the earliest metals found and used in the world, and is widely used in industry due to its good electrical and thermal conductivity, strong corrosion resistance, and easy processing. Copper is second to steel and aluminum in metal material consumption, and becomes an indispensable basic material and strategic material in civil and national defense engineering and even in high and new technical fields.

At present, copper metal resource reserves in China are not abundant, and lean ores are more, rich ores are less, refractory ores are more, mineral dressing is less, intergrown ores are more, and single ores are less. By 2020, the external dependence of copper resources in China is still kept at about 70%, the passive situation that copper concentrate depends on import seriously is difficult to change in a short period, and hidden troubles are caused to national defense safety, economic safety and social problems in China.

The zinc blende is the most common zinc-containing mineral on the earth and often exists as gangue mineral together with sulphide minerals such as chalcopyrite, chalcocite, bornite and the like. When the content of zinc in the copper concentrate is high, the grade of copper is low, the difficulty is increased for subsequent processing, and the market price of the copper concentrate is seriously influenced. In order to improve the copper grade of the copper concentrate, zinc removal is required.

In industry, copper concentrate is obtained mainly through flotation separation, and then pyrometallurgy is carried out to finally obtain a copper concentrate product. However, because the floatability of copper ore and zinc ore is similar, the copper concentrate often contains more than 10% of zinc, and the copper concentrate is difficult to be completely separated by adopting the traditional flotation method, which brings great trouble to the subsequent smelting process. And in the flotation process, the activation of copper ions in the ore pulp reduces the difference between the surface hydrophobicity of the copper sulfide minerals and the zinc sulfide minerals, so that the copper and zinc are difficult to separate by using the flotation method.

The microbial metallurgy technology is a new technology for preparing high-purity materials by selectively leaching valuable elements from ores by utilizing the oxidation, dissolution and other actions of certain microbes or metabolites thereof on the ores. The biological pretreatment of copper ores has been in history for decades, and with the discovery of high-temperature leaching microorganisms and the application of the high-temperature leaching microorganisms in the field of biological metallurgy, the biological pretreatment of the copper ores is promoted to a certain extent.

However, at present, no better method is available for realizing the complete separation of zinc and copper concentrate, so how to realize the efficient selective removal of zinc in copper concentrate on the basis of simple process, low cost and environmental protection becomes the current technical problem.

disclosure of Invention

The invention provides a microorganism dezincification method aiming at the problem that the copper concentrate and zinc are difficult to be thoroughly and selectively separated in high efficiency in the wet metallurgy and mineral processing industries at present, which not only saves the cost in the dezincification process, but also can expand the resource utilization range, simultaneously ensure the process speed and efficiency and improve the resource recovery level of metal zinc.

the invention adopts the following technical scheme for solving the problems in the prior art: a method for selectively removing zinc from a zinc-bearing copper concentrate using microorganisms, comprising the steps of:

(1) pretreating zinc-containing copper concentrate;

(2) preparing the zinc-containing copper concentrate after pretreatment into ore pulp;

(3) Inoculating ore leaching microorganisms into the ore pulp, adding nutrient substances, and then stirring and leaching;

(4) and carrying out solid-liquid separation on the leached ore pulp to obtain the low-zinc high-grade copper concentrate and the zinc-containing leaching solution after selective zinc removal.

preferably, in the step (1), the zinc grade of the zinc ~ copper ~ containing concentrate is lower than 22%, and the copper grade is 16% ~ 33%.

Preferably, in the step (1), the pretreatment method comprises concentrate regrinding and reagent removal, and the treated ore has a granularity of less than or equal to 0.1mm and accounts for more than 99%.

Preferably, in the step (2), the concentration of the ore pulp is less than or equal to 30 percent.

Preferably, in the step (3), the nutrient substances are soluble salts containing ferrous iron, nitrogen, phosphorus, potassium, magnesium and calcium and elemental sulfur.

Preferably, in the step (3), the microorganism is one or more of acidithiobacillus ferrooxidans, leptospirillum ferrooxidans and leptospirillum ferrophilum.

preferably, in the step (3), the pH value of the ore pulp is adjusted to be less than or equal to 5.0 during leaching, and the temperature during leaching is controlled to be 20 ~ 90 ℃.

preferably, in the step (3), the stirring speed is 15 ~ 750 rpm.

preferably, in the step (3), the potential of a leaching system in the agitation leaching process is controlled to be 350 ~ 850mV relative to a saturated silver/silver chloride electrode.

Preferably, in the step (3), the stirring leaching time is more than or equal to 0.5 h.

the invention has the following advantages: the invention adopts high-temperature mineral leaching microorganisms, particularly moderate thermophilic microorganisms, which not only can effectively improve the reaction kinetics, but also can prevent the passivation phenomenon in the reaction process, improve the pretreatment effect, and can efficiently and selectively remove zinc in copper concentrate, wherein the removal rate is over 80 percent; the method utilizes the characteristics of simple microbial technology flow, environmental friendliness, low cost and the like to selectively and efficiently dezincify the copper concentrate, and solves the problems of complex dezincification process, high production cost, heavy pollution, high zinc loss rate and the like in the prior art; the method can realize the selective separation of zinc and target metal without roasting, pressurizing and other processes and chemical oxidants, greatly reduces the production cost, and can be widely applied to the fields of hydrometallurgy and mineral processing; according to the invention, high-grade target concentrate can be obtained through solid-liquid separation after leaching treatment, and the obtained filtrate can be used as a production raw material of metal zinc, so that the economic benefit is improved to the maximum extent; the method has short flow and high efficiency, is a clean and high-efficiency multi-element comprehensive utilization process, and is easy for large-scale industrial production.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.