阅读说明：本技术 一种从载金炭中回收金的方法 (Method for recovering gold from gold-loaded carbon ) 是由 陈小辉 宋洪旺 王志国 张长征 李达 杨成森 张孝 章邦琼 王军 祝宝军 李志伟 于 2021-06-25 设计创作，主要内容包括：本公开涉及一种从载金炭中回收金的方法,该方法通过采用制团-焙烧-氰化提金工艺,能够简单、高效地回收选厂废料-载金炭中的金,具体地,该方法对选厂废料-载金炭中的金的回收率不低于90％。(The invention relates to a method for recovering gold from gold-loaded carbon, which can simply and efficiently recover the gold in the plant selection waste material-gold-loaded carbon by adopting a briquetting-roasting-cyaniding gold extraction process, and particularly has the recovery rate of the gold in the plant selection waste material-gold-loaded carbon of not less than 90 percent.)

1. A method for recovering gold from gold-loaded carbon, the method comprising:

s010, preparing gold-loaded carbon into gold-loaded carbon pellets;

s020, roasting the gold-loaded carbon pellets in a roasting furnace to obtain carbon ash, wherein roasting conditions comprise: the roasting temperature is 800-850 ℃, and the roasting time is 24-28 h;

s030, performing cyaniding leaching on the carbon ash after slurry mixing to obtain a leaching solution, and performing analytic electrolysis treatment on the leaching solution to obtain solid gold.

2. The method as claimed in claim 1, wherein in step S020, the step of roasting the gold-loaded carbon pellets in a roasting furnace to obtain carbon ash comprises:

s021, placing part of the gold-loaded carbon pellets into a roasting furnace and completely covering an ignition object in the roasting furnace so as to ignite the gold-loaded carbon pellets;

s022, after part of the gold-loaded carbon pellets added in the step S021 are ignited, adding the rest part of the gold-loaded carbon pellets into a roasting furnace along the inner wall of the roasting furnace for roasting.

3. The method of claim 1, wherein the gold-bearing carbon is produced from a gold ore all-mud cyanidation carbon slurry process including attrition of granular carbon, attrition of pulverized carbon, shop recycled carbon and safety screen wood chips.

4. The method of claim 3, wherein in step S010, the step of preparing the gold-loaded carbon into gold-loaded carbon pellets comprises:

and mixing the gold-loaded carbon with an adhesive, an additive and water, and feeding the mixture into a briquetting machine to be pressed to obtain the gold-loaded carbon pellets.

5. The method of claim 4, wherein the amount of the abraded granular carbon is 20 to 35 wt%, the amount of the abraded powdered carbon is 20 to 35 wt%, the amount of the workshop recycled carbon is 20 to 35 wt%, the amount of the safety screen wood dust is 5 to 10 wt%, the amount of the binder is 7 to 9 wt%, the amount of the additive is 12 to 15 wt%, and the amount of the water is 7 to 9 wt%, based on the total weight of the gold-loaded carbon pellets;

preferably, based on the total weight of the gold-loaded carbon pellets, the consumption of the abraded granular carbon is 20-25 wt%, the consumption of the abraded powdery carbon is 20-25 wt%, the consumption of the workshop recycled carbon is 20-25 wt%, the consumption of the safety sieve sawdust is 5-7 wt%, the consumption of the adhesive is 7-8 wt%, the consumption of the additive is 14-15 wt%, and the consumption of the water is 7-8 wt%.

6. The method of claim 4 or 5, wherein the binder comprises at least one of bentonite, an inorganic binder, an organic binder, and a composite binder, and the additive comprises at least one of a curing agent, a catalyst, a plasticizer, and an accelerator.

7. The method as claimed in any one of claims 1 to 5, wherein the gold-loaded carbon pellet has a diameter of 30 to 50cm and a gold-containing grade of 200 to 300 g/t.

8. The method according to claim 1 or 2, further comprising the operation of adding an oxidizer to the furnace during the firing, wherein the oxidizer is selected from at least one of diesel, gas, coke and wood, preferably diesel.

9. A process according to any one of claims 1 to 5, wherein cyanidation leaching conditions include: the carbon mortar comprises 38-40% by mass, 10.5-11.5% by pH, and 4-6 kg/t of NaCN.

10. The method according to any one of claims 1 to 5, wherein in step S010, before the gold-loaded carbon is made into gold-loaded carbon pellets, the method further comprises an operation of pretreating the gold-loaded carbon, wherein the pretreatment comprises:

and washing the gold-loaded carbon for 2-3 times, and then drying at 80-100 ℃.

Technical Field

The disclosure relates to the technical field of metallurgy, in particular to a method for recovering gold from gold-loaded carbon.

Background

In the process of full-mud carbon-cyanide slurry of gold ore, a large amount of gold-carrying carbon can be generated due to repeated use of activated carbon, mechanical abrasion and the like, the gold-bearing grade of the gold-carrying carbon is from dozens of grams/ton to hundreds of grams/ton, and if the gold contained in the gold-carrying carbon cannot be effectively recovered, the concentration recovery rate of a carbon slurry plant is inevitably reduced. However, these gold-loaded carbons have the characteristics of finer particles, more impurities, and large grade variation, which results in that gold therein cannot be recovered by a desorption process. Therefore, a method capable of effectively recovering gold from gold-loaded carbon is needed.

Disclosure of Invention

It is an object of the present disclosure to provide a method for recovering gold from gold-loaded carbon.

In order to achieve the above object, the present disclosure provides a method for recovering gold from gold-loaded carbon, the method comprising:

s010, preparing gold-loaded carbon into gold-loaded carbon pellets;

s020, roasting the gold-loaded carbon pellets in a roasting furnace to obtain carbon ash, wherein roasting conditions comprise: the roasting temperature is 800-850 ℃, and the roasting time is 24-28 h;

s030, performing cyaniding leaching on the carbon ash after slurry mixing to obtain a leaching solution, and performing analytic electrolysis treatment on the leaching solution to obtain solid gold.

Optionally, in step S020, roasting the gold-loaded carbon pellets in a roasting furnace to obtain carbon ash, including:

s021, placing part of the gold-loaded carbon pellets into a roasting furnace and completely covering an ignition object in the roasting furnace so as to ignite the gold-loaded carbon pellets;

s022, after part of the gold-loaded carbon pellets added in the step S021 are ignited, adding the rest part of the gold-loaded carbon pellets into a roasting furnace along the inner wall of the roasting furnace for roasting.

Optionally, the gold-bearing carbon is produced from an all-mud cyanidation carbon slurry process of gold ore, including abraded granular carbon, abraded powdered carbon, shop recycled carbon and safety screen wood dust.

Optionally, in step S010, the preparing gold-loaded carbon into gold-loaded carbon pellets includes:

and mixing the gold-loaded carbon with an adhesive, an additive and water, and feeding the mixture into a briquetting machine to be pressed to obtain the gold-loaded carbon pellets.

Alternatively,

based on the total weight of the gold-loaded carbon pellets, the consumption of the abraded granular carbon is 20-35 wt%, the consumption of the abraded powdery carbon is 20-35 wt%, the consumption of the workshop recycled carbon is 20-35 wt%, the consumption of the safety sieve sawdust is 5-10 wt%, the consumption of the adhesive is 7-9 wt%, the consumption of the additive is 12-15 wt%, and the consumption of the water is 7-9 wt%;

preferably, based on the total weight of the gold-loaded carbon pellets, the consumption of the abraded granular carbon is 20-25 wt%, the consumption of the abraded powdery carbon is 20-25 wt%, the consumption of the workshop recycled carbon is 20-25 wt%, the consumption of the safety sieve sawdust is 5-7 wt%, the consumption of the adhesive is 7-8 wt%, the consumption of the additive is 14-15 wt%, and the consumption of the water is 7-8 wt%.

Optionally, the binder comprises at least one of bentonite, an inorganic binder, an organic binder and a composite binder, and the additive comprises at least one of a curing agent, a catalyst, a plasticizer and an accelerator.

Optionally, the diameter of the gold-loaded carbon pellet is 30-50 cm, and the gold grade is 200-300 g/t.

Optionally, the method further comprises the operation of adding an oxidant to the roasting furnace during roasting, wherein the oxidant is selected from at least one of diesel, coal gas, coke and wood, preferably diesel.

Alternatively, the conditions for cyanidation leaching include: the carbon mortar comprises 38-40% by mass, 10.5-11.5% by pH, and 4-6 kg/t of NaCN.

Optionally, in step S010, before the gold-loaded carbon is made into gold-loaded carbon pellets, an operation of performing pretreatment on the gold-loaded carbon is further included, where the pretreatment includes:

and washing the gold-loaded carbon for 2-3 times, and then drying at 80-100 ℃.

By adopting the technical scheme, the method disclosed by the invention can simply and efficiently recover the gold in the plant selection waste-gold-loaded carbon by adopting the briquetting-roasting-cyaniding gold extraction process, and particularly, the recovery rate of the gold in the plant selection waste-gold-loaded carbon is not lower than 90%.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

The present disclosure provides a method for recovering gold from gold-loaded carbon, the method comprising: s010, preparing gold-loaded carbon into gold-loaded carbon pellets; s020, roasting the gold-loaded carbon pellets in a roasting furnace to obtain carbon ash, wherein roasting conditions comprise: the roasting temperature is 800-850 ℃, and the roasting time is 24-28 h; s030, performing cyaniding leaching on the carbon ash after slurry mixing to obtain a leaching solution, and performing analytic electrolysis treatment on the leaching solution to obtain solid gold.

The inventor of the present disclosure finds that the burn-out rate of the gold-loaded carbon pellets after roasting has a large influence on the recovery rate of gold in the gold-loaded carbon, and specifically, the larger the burn-out rate of the gold-loaded carbon pellets is, the higher the recovery rate of gold is. This openly regulates and control through the calcination condition to carrying gold carbon pellet, has effectively promoted the burn-out rate of carrying gold carbon pellet to show the rate of recovery that has promoted gold in the carrying gold carbon. Specifically, after the gold-loaded carbon pellets are roasted under the roasting condition in the step S020, the burning loss rate of the gold-loaded carbon pellets is not less than 42%, and the recovery rate of gold in the gold-loaded carbon is not less than 90%.

Through the technical scheme, the method disclosed by the invention can simply and efficiently recover the gold in the plant selection waste-gold-loaded carbon by adopting the briquetting-roasting-cyaniding gold extraction process, and has the advantages of simple process flow, easily-controlled process conditions, simple equipment and lower investment cost.

According to the disclosure, in order to reduce gold loss in the roasting process, in step S020, when the gold-loaded carbon pellets are roasted in the roasting furnace to obtain carbon ash, a part of the gold-loaded carbon pellets may be placed in the roasting furnace and completely cover the ignition material in the roasting furnace, so that the gold-loaded carbon pellets are ignited, and then after the part of the gold-loaded carbon pellets to be added is ignited, the remaining part of the gold-loaded carbon pellets are added into the roasting furnace along the inner wall of the roasting furnace to be roasted.

In the present disclosure, the ignition material may be coke or firewood, before the firing, the ignition material may be ignited, and after the ignition material burns vigorously, the ignition material is placed on a sieve plate in the firing furnace as a primer, and after the primer reaches the firing temperature, a part of the gold-loaded carbon pellets are placed in the firing furnace and completely cover the ignition material. The residual gold-loaded carbon pellets are added along the inner wall of the roasting furnace, so that a 'fire core' can be reserved in the middle of the roasting furnace, and the gas generated in the roasting process can escape conveniently, thereby reducing the gold-loaded carbon fly ash in the roasting process and reducing the gold loss. In the roasting process, in order to ensure that the gold-loaded carbon pellets can be continuously and efficiently combusted, ventilation can be performed to the roasting furnace, and specifically, air can be blown to the roasting furnace by an air blower.

In the roasting process, the gold-loaded carbon pellets in the roasting furnace can be stirred up and down at intervals, so that powdered or granular carbon ash falls into the lower part of the sieve plate, and simultaneously, the cemented carbon ash is cleaned out of the roasting furnace, so that the sieve plate is prevented from being blocked and the blast effect is prevented from being influenced. The air quantity can be reduced in the later stage of roasting, the flame of burning is gradually reduced, the carbon ash is prevented from splashing to influence the recovery rate of gold until no fire exists, the gold-loaded carbon is roasted completely, and the gold-loaded carbon is placed into a barrel after being cooled.

In accordance with the present disclosure, the gold-bearing carbon is produced from an all-mud carbon cyanide slurry process of gold ore, which may include, for example, abraded granular carbon, abraded powdered carbon, shop recycled carbon, and safety screen wood chips.

Specifically, the worn granular carbon and the worn powdered carbon are waste carbon generated by mechanical wear in the leaching process of the all-mud carbon cyanide slurry process, wherein the gold-containing grade of the worn granular carbon is high and is about 750-860 g/t, and the gold-containing grade of the worn powdered carbon is low and is about 20-40 g/t. The workshop recycled carbon refers to waste carbon cleaned and recycled from the ground of a leaching workshop and an electrolysis workshop of the all-mud carbon cyanide slurry process, and the gold grade of the waste carbon is low and is about 50-60 g/t due to the clay impurities. The safety sieve sawdust is produced from a tailing safety sieve, and the gold-containing grade of the safety sieve sawdust is high and is about 330-400 g/t.

According to the disclosure, in step S010, when the gold-loaded carbon is made into gold-loaded carbon pellets, the gold-loaded carbon may be mixed with a binder, an additive and water, and then sent to a briquetting machine to be pressed into the gold-loaded carbon pellets.

According to the present disclosure, in the preparation of gold-loaded carbon pellets, the amount of each component may be selected within a certain range, for example, based on the total weight of the gold-loaded carbon pellets, the amount of the wear granular carbon may be 20 to 35 wt%, the amount of the wear powdery carbon may be 20 to 35 wt%, the amount of the plant recycled carbon may be 20 to 35 wt%, the amount of the safety sieve sawdust may be 5 to 10 wt%, the amount of the binder may be 7 to 9 wt%, the amount of the additive may be 12 to 15 wt%, and the amount of the water may be 7 to 9 wt%.

Preferably, based on the total weight of the gold-loaded carbon pellets, the amount of the abraded granular carbon may be 20 to 25 wt%, the amount of the abraded powdery carbon may be 20 to 25 wt%, the amount of the workshop recycled carbon may be 20 to 25 wt%, the amount of the safety sieve sawdust may be 5 to 7 wt%, the amount of the binder may be 7 to 8 wt%, the amount of the additive may be 14 to 15 wt%, and the amount of the water may be 7 to 8 wt%.

According to the present disclosure, the binder and the additive may be selected within a certain range, for example, the binder may include at least one of bentonite, an inorganic binder, an organic binder, and a composite binder, and the additive includes at least one of a curing agent, a catalyst, a plasticizer, and an accelerator. The specific selection of the above additives may be conventional in the art, and will not be described herein.

According to the present disclosure, the diameter of the gold-loaded carbon pellet is 30-50 cm, and the gold grade is 200-300 g/t.

Specifically, the inventor of the present disclosure finds that, when the gold-containing grade of the gold-loaded carbon pellet is 200-300 g/t, the recovery rate and efficiency of gold recovered from the gold-loaded carbon pellet are both high, and therefore, in the present disclosure, the addition amount of various gold-loaded carbons can be regulated and controlled according to the gold-containing grade of various gold-loaded carbons when the gold-loaded carbon pellet is prepared, so as to further improve the recovery rate and efficiency of gold.

According to the present disclosure, in order to accelerate the combustion of the gold-loaded carbon pellets, a combustion improver may be further added into the roasting furnace during the roasting process, wherein the combustion improver is at least one selected from diesel oil, coal gas, coke and wood, and preferably the diesel oil.

According to the present disclosure, the conditions of the cyanidation leaching may vary within certain ranges, for example, the conditions of the cyanidation leaching may include: the carbon mortar comprises 38-40% by mass, 10.5-11.5% by pH, and 4-6 kg/t of NaCN.

In the present disclosure, the carbon ash obtained after calcination usually presents a cementitious, powdery or granular state, and therefore, in order to improve the efficiency of cyanide leaching, the carbon ash may be subjected to water quenching before size mixing, so that the cementitious carbon ash is dispersed into a small-particle state. Cyaniding leaching can be carried out in the stirring tank, and in order to ensure cyaniding leaching effect and improve gold leaching rate, air can be supplied to the stirring tank.

According to the present disclosure, in the process of the all-mud carbon cyanide slurry, since the gold-loaded carbon has a high moisture content and can adsorb impurities such as silt in a water body while being in a water environment for a long time, which increases the roasting difficulty and the production cost, in step S010, the gold-loaded carbon may be pretreated to remove moisture and impurities therein before being made into gold-loaded carbon pellets. Wherein the pre-processing may include: and washing the gold-loaded carbon for 2-3 times, and then drying at 80-100 ℃.

The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.

The raw materials, reagents, instruments and equipment involved in the examples of the present disclosure may be purchased without specific reference.

Example 1

The gold is recovered from the gold-loaded carbon as follows:

(1) uniformly mixing 22 wt% of wear granular carbon, 22 wt% of wear powdery carbon, 22 wt% of workshop recycled carbon, 5.5 wt% of safety sieve sawdust, 7.1 wt% of bentonite, 14.3 wt% of catalyst and 7.1 wt% of water, and sending the mixture into a briquetting machine to prepare gold-loaded carbon pellets with the diameter of 30-50 cm and the gold-containing grade of 200g/t, wherein the wear granular carbon, the wear powdery carbon, the workshop recycled carbon and the safety sieve sawdust are washed and dried in advance;

(2) igniting coke with the length of about 20cm, putting the coke on a sieve plate in a roasting furnace as primer after the coke is burnt vigorously, adding gold-loaded carbon pellets after the primer temperature reaches 800 ℃, completely covering the burnt coke, simultaneously starting an air blower to roast the gold-loaded carbon pellets, adding a proper amount of diesel oil as a combustion improver to accelerate the roasting speed of the gold-loaded carbon pellets until the pellet combustion temperature reaches 800 ℃, then discontinuously adding the gold-loaded carbon pellets along the inner wall of the roasting furnace to ensure that a 'fire center' flows out from the middle of the roasting furnace so as to facilitate the escape of gas, and collecting carbon ash after roasting for 24 hours;

(3) performing water quenching on the collected carbon ash to disperse the cemented carbon ash into particles with smaller particle size, performing a cyaniding leaching process after size mixing, completing the cyaniding leaching in a mechanical stirring tank, supplying air into the stirring tank in the cyaniding leaching process to ensure the cyaniding leaching effect, improving the leaching rate of gold, returning the generated pregnant solution to an analytic electrolysis process, and collecting solid gold generated by the analytic electrolysis process, wherein the cyaniding leaching conditions comprise: the carbon mortar is 40% in mass fraction, the pH value is 10.5-11.5, and the NaCN consumption is 4 kg/t.

During roasting, the total feeding weight of the gold-loaded carbon pellets fed into the roasting furnace is weighed and recorded, after roasting, the total collected carbon ash weight is weighed and recorded, the burning loss rate (the burning loss rate is (total feeding weight-total carbon ash weight)/total feeding weight x 100%) is calculated, and the gold leaching rate is detected.

Example 2

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the calcination time in step (2) is shown in Table 1.

Comparative examples 1 to 3

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the calcination time in step (2) is shown in Table 1.

TABLE 1

Example 3

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the calcination temperature in step (2) is shown in Table 2.

Comparative examples 4 to 5

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the calcination temperature in step (2) is shown in Table 2.

TABLE 2

Examples 4 to 6

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the amount of each raw material used when preparing the gold-loaded carbon pellets in step (1) is shown in table 3.

Comparative example 6

Gold was recovered from the gold-loaded carbon according to the method of example 1, except that: the amount of each raw material used when preparing the gold-loaded carbon pellets in step (1) is shown in table 3.

TABLE 3

As can be seen from tables 1 to 3, the method disclosed by the invention can effectively recover gold in the gold-loaded carbon, and the recovery rate is higher.

The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.