A comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore

Abstract

This invention relates to the field of mineral processing technology and is a comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore, comprising the following steps: First, the raw ore undergoes grinding and gold-flotation roughing and desliming flotation to produce gold-flotation rough concentrate and desliming flotation tailings; Second, using the desliming flotation tailings as feed, copper-gold roughing is performed to produce copper-gold rough concentrate and copper-gold roughing tailings; Third, using the copper-gold rough concentrate as feed, copper-gold cleaning operation I is performed, which is an open-loop + closed-loop process consisting of two cleaning operations and one fine scavenging operation, producing copper-gold cleaning operation I scavenging concentrate and copper-gold cleaning operation I tailings. This invention reduces the impact of subsequent slime on the flotation of copper oxide minerals by separating gold-flotation rough concentrate and gold-flotation rough concentrate, while also reducing the amount of slime depressant used, thereby reducing the concentration of slime depressant during copper-gold flotation, further reducing the inhibition of copper minerals by depressant, and indirectly improving the floatability of copper-gold minerals.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore. Background Technology

[0002] Surface oxidized copper ores exhibit significant lithological variations due to differences in the degree of skarnification and further alteration. However, they are generally rich in calcium and magnesium, making them prone to mud formation during grinding. Furthermore, the alteration products, talc, chlorite, and serpentine, possess excellent floatability, leading to reagent competition for adsorption with copper and gold minerals during flotation. The presence of mineral surface coatings and the relatively small differences in floatability further hinder the beneficiation and separation / recovery of copper and gold in these ores. Their separation and recovery represent a major challenge in mineral processing, making technological research on these ores crucial for technological breakthroughs and resource utilization. Summary of the Invention

[0003] This invention provides a comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore, which overcomes the shortcomings of the existing technology and can effectively solve the problems of large impact of ore slime, poor concentrate quality and low recovery rate in the flotation recovery of high-magnesium altered copper-gold ore.

[0004] To address the aforementioned problems, the present invention provides a comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore, comprising the following steps:

[0005] The first step involves grinding the raw ore and performing roughing and desliming flotation operations to produce rough gold concentrate and desliming flotation tailings.

[0006] The second step involves using the deslimed flotation tailings as feed for copper-gold roughing operations, producing copper-gold rough concentrate and copper-gold roughing tailings.

[0007] The third step involves using copper-gold rough concentrate as feed to carry out copper-gold beneficiation I operation. Copper-gold beneficiation I operation is an open-loop + closed-loop process consisting of two beneficiations and one fine sweeping, producing copper-gold beneficiation I scavenged concentrate and copper-gold beneficiation I tailings.

[0008] The fourth step involves using the concentrate obtained from the first copper-gold beneficiation operation I as feed for copper-gold beneficiation operation II. Copper-gold beneficiation operation II is an open-loop + closed-loop process consisting of two beneficiations and one fine sweeping, producing copper-gold beneficiation operation II scavenged concentrate and copper-gold beneficiation operation II tailings.

[0009] The fifth step involves using the gold-bearing rough concentrate produced in the first step as feed for gold-bearing separation flotation, producing gold-bearing separation flotation gold concentrate and gold-bearing separation tailings; the gold-bearing separation flotation is carried out through one roughing, one cleaning, and one scavenging operation.

[0010] The sixth step involves using the tailings from copper-gold concentrate I, copper-gold concentrate II, and gold mud separation as feedstock to perform Nelson gravity separation for enhanced gold recovery, producing gravity-separated gold concentrate and gravity-separated tailings.

[0011] The above also includes merging the primary concentrate of copper-gold selection II and the secondary concentrate of copper-gold selection II into the final copper-gold concentrate; merging the gold concentrate obtained from gold mud separation flotation in step 5 and the gold concentrate obtained from gravity separation in step 6 into the final gold concentrate; and merging the tailings from copper-gold roughing in step 2 and the tailings from gravity separation in step 6 into the final tailings.

[0012] In the third step mentioned above, the copper-gold beneficiation I operation is an open-loop + closed-loop process consisting of two beneficiation processes and one fine scavenging process, producing copper-gold beneficiation I scavenged concentrate and copper-gold beneficiation I tailings. This includes: the copper-gold rough concentrate undergoes a first flotation in copper-gold beneficiation I to produce a first-stage copper-gold beneficiation I concentrate and a first-stage copper-gold beneficiation I tailings; the first-stage copper-gold beneficiation I tailings are used as feed for a second-stage copper-gold beneficiation I flotation to produce a second-stage copper-gold beneficiation I concentrate and a second-stage copper-gold beneficiation I tailings; and the second-stage copper-gold beneficiation I tailings are used as feed for a scavenging flotation in copper-gold beneficiation I to produce a scavenging concentrate and a first-stage copper-gold beneficiation I tailings.

[0013] The copper-gold concentrate produced by the copper-gold refining I scavenging and flotation process is returned to the secondary tailings feed of the copper-gold refining I process, realizing an open-loop + closed-loop process for the copper-gold refining I operation.

[0014] In the fourth step above, the copper-gold refining II operation is an open-loop + closed-loop process consisting of two refining processes and one fine scavenging process, producing copper-gold refining II scavenged concentrate and copper-gold refining II tailings. This includes: using the copper-gold refining I primary concentrate obtained in the third step as feed, performing copper-gold refining II primary flotation to produce copper-gold refining II primary concentrate and copper-gold refining II primary tailings; using the copper-gold refining II primary tailings and the copper-gold refining I secondary concentrate obtained in the third step as feed, performing copper-gold refining II secondary flotation to produce copper-gold refining II secondary concentrate and copper-gold refining II secondary tailings; and using the copper-gold refining I secondary tailings as feed, performing copper-gold refining II scavenged flotation to produce copper-gold refining II scavenged concentrate and copper-gold refining II tailings.

[0015] The copper-gold concentrate produced by the copper-gold refining II scavenging and flotation process is returned to the secondary tailings feed of the copper-gold refining II process, realizing an open-loop + closed-loop process for the copper-gold refining II operation.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This invention reduces the impact of subsequent slime on the flotation of copper oxide minerals by separating floatable slime such as gold slime into gold slime and reducing the amount of slime inhibitor used, thereby reducing the concentration of slime inhibitor during copper-gold flotation, further reducing the inhibition of copper minerals by inhibitor, and indirectly improving the floatability of copper-gold minerals.

[0018] 2. This invention adopts open-circuit flotation and closed-loop flotation for copper and gold. Under the condition of ensuring that the open-circuit flotation achieves high concentrate quality and basic recovery rate, the two-step fine-graining produces concentrate, stabilizes and improves the recovery rate, and uses fine-graining and scavenging to enhance the recovery of the operation and dilute the tailings of the flotation operation, so as to achieve the purpose of efficient flotation.

[0019] 3. This invention enhances gold recovery by centrally employing Nelson gravity separation in the depleted tailings through mud-gold separation and copper-gold beneficiation.

[0020] In summary, this invention solves the problems of large impact of slime on the flotation recovery of high magnesium altered copper-gold ore, poor concentrate quality, and low recovery rate. The developed process produces high-quality flotation products, has high metal recovery efficiency, and is stable and easy to operate. Attached Figure Description

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a process flow diagram of an embodiment of the present invention. Detailed Implementation

[0023] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0024] Example 1: This embodiment of the invention discloses a comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore, comprising the following steps:

[0025] The first step involves grinding the raw ore and performing roughing and desliming flotation operations to produce rough gold concentrate and desliming flotation tailings.

[0026] The second step involves using the deslimed flotation tailings as feed for copper-gold roughing operations, producing copper-gold rough concentrate and copper-gold roughing tailings.

[0027] The third step involves using copper-gold rough concentrate as feed to carry out copper-gold beneficiation I operation. Copper-gold beneficiation I operation is an open-loop + closed-loop process consisting of two beneficiations and one fine sweeping, producing copper-gold beneficiation I scavenged concentrate and copper-gold beneficiation I tailings.

[0028] The fourth step involves using the concentrate obtained from the first copper-gold beneficiation operation I as feed for copper-gold beneficiation operation II. Copper-gold beneficiation operation II is an open-loop + closed-loop process consisting of two beneficiations and one fine sweeping, producing copper-gold beneficiation operation II scavenged concentrate and copper-gold beneficiation operation II tailings.

[0029] The fifth step involves using the gold-bearing rough concentrate produced in the first step as feed for gold-bearing separation flotation, producing gold-bearing separation flotation gold concentrate and gold-bearing separation tailings; the gold-bearing separation flotation is carried out through one roughing, one cleaning, and one scavenging operation.

[0030] The sixth step involves using the tailings from copper-gold concentrate I, copper-gold concentrate II, and gold mud separation as feedstock to perform Nelson gravity separation for enhanced gold recovery, producing gravity-separated gold concentrate and gravity-separated tailings.

[0031] In the third step mentioned above, the copper-gold beneficiation I operation is an open-loop + closed-loop process consisting of two beneficiation processes and one fine scavenging process, producing copper-gold beneficiation I scavenged concentrate and copper-gold beneficiation I tailings. This includes: the copper-gold rough concentrate undergoes a first flotation in copper-gold beneficiation I to produce a first-stage copper-gold beneficiation I concentrate and a first-stage copper-gold beneficiation I tailings; the first-stage copper-gold beneficiation I tailings are used as feed for a second-stage copper-gold beneficiation I flotation to produce a second-stage copper-gold beneficiation I concentrate and a second-stage copper-gold beneficiation I tailings; and the second-stage copper-gold beneficiation I tailings are used as feed for a scavenging flotation in copper-gold beneficiation I to produce a scavenging concentrate and a first-stage copper-gold beneficiation I tailings.

[0032] The copper-gold concentrate produced by the copper-gold refining I scavenging and flotation process is returned to the secondary tailings feed of the copper-gold refining I process, realizing an open-loop + closed-loop process for the copper-gold refining I operation.

[0033] In the fourth step above, the copper-gold refining II operation is an open-loop + closed-loop process consisting of two refining processes and one fine scavenging process, producing copper-gold refining II scavenged concentrate and copper-gold refining II tailings. This includes: using the copper-gold refining I primary concentrate obtained in the third step as feed, performing copper-gold refining II primary flotation to produce copper-gold refining II primary concentrate and copper-gold refining II primary tailings; using the copper-gold refining II primary tailings and the copper-gold refining I secondary concentrate obtained in the third step as feed, performing copper-gold refining II secondary flotation to produce copper-gold refining II secondary concentrate and copper-gold refining II secondary tailings; and using the copper-gold refining I secondary tailings as feed, performing copper-gold refining II scavenged flotation to produce copper-gold refining II scavenged concentrate and copper-gold refining II tailings.

[0034] The copper-gold concentrate produced by the copper-gold refining II scavenging and flotation process is returned to the secondary tailings feed of the copper-gold refining II process, realizing an open-loop + closed-loop process for the copper-gold refining II operation.

[0035] The above-mentioned copper-gold concentrate II primary concentrate is obtained through the following processes: first step roughing and desliming flotation of gold and other floatable materials; second step roughing of copper and gold; third step primary copper-gold concentrate I; and fourth step primary copper-gold concentrate II. The concentrate is obtained without middlings return and is unaffected by the reagent-laden slime obtained from processes other than the primary concentrate acquisition steps, resulting in high-quality copper-gold concentrate.

[0036] The process of obtaining the copper-gold concentrate II is as follows: the copper-gold concentrate I secondary concentrate is fed in the third step, the copper-gold concentrate II primary concentrate is fed in the fourth step, and the copper-gold concentrate II scavenging and flotation concentrate is fed in the fourth step. After secondary refining by copper-gold concentrate II, the copper-gold concentrate obtained is obtained as copper-gold concentrate for enhanced copper-gold recovery.

[0037] The copper-gold concentrate from the first stage and the copper-gold concentrate from the second stage are combined to form the final copper-gold concentrate. The gold concentrate from the fifth step of gold mud separation flotation and the gold concentrate from the sixth step of gravity separation are combined to form the final gold concentrate. The tailings from the second step of copper-gold roughing and the tailings from the sixth step of gravity separation are combined to form the final tailings. The product structure consists of copper-gold concentrate, gold concentrate and tailings.

[0038] In summary, the embodiments of the present invention reduce the impact of subsequent slime on the flotation of copper oxide minerals by separating floatable slime such as gold slime into gold slime and reduce the amount of slime inhibitor used, thereby reducing the concentration of slime inhibitor during copper-gold flotation, further reducing the inhibition of copper minerals by inhibitor, and indirectly improving the floatability of copper-gold minerals.

[0039] Furthermore, this invention employs open-circuit flotation and closed-loop flotation for copper and gold. Under the condition of ensuring high concentrate quality and basic recovery rate in open-circuit flotation, two-step fine-tuning produces concentrate, stabilizes and improves the recovery rate, and strengthens the recovery of the operation by fine-tuning and scavenging, thereby reducing the tailings of the flotation operation and achieving the goal of efficient flotation.

[0040] Furthermore, this invention enhances gold recovery by centrally employing Nelson gravity separation in the depleted tailings through mud-gold separation and copper-gold beneficiation.

[0041] Therefore, this invention solves the problems of large impact of ore slime on the flotation recovery of high magnesium altered copper-gold ore, poor concentrate quality, and low recovery rate. The developed process produces flotation products with good quality, high metal recovery efficiency, and is stable and easy to operate.

[0042] Example 2: An experiment was conducted on a talc-type, high-magnesium, highly altered copper-gold ore deposit in Kyrgyzstan, with a copper grade of 0.68% and a gold grade of 1.51 g / t.

[0043] Step 1: After grinding the ore with pH adjuster lime, add frother MIBC and collector A23, and then perform roughing flotation of mud gold to produce mud gold concentrate and desliming flotation tailings.

[0044] Step 2: Using the desliming flotation tailings from step (1) as feed, add modifier T-YF, sodium hydrosulfide, ammonium sulfate and collector light white oil and A23 to adjust the slurry and carry out copper-gold roughing operation to produce copper-gold rough concentrate and copper-gold roughing tailings.

[0045] Step 3: The copper-gold rough concentrate obtained in step (2) is slurried with the addition of modifier T-YF and collector A23 and then used as feed for copper-gold beneficiation I operation. Copper-gold beneficiation I operation is an open-loop + closed-loop process of two beneficiations and one fine scavenging. That is, the copper-gold rough concentrate is floated through copper-gold beneficiation I ① to produce copper-gold beneficiation I ① concentrate and copper-gold beneficiation I ① tailings. Copper-gold beneficiation I ② is floated with the copper-gold beneficiation I ① tailings as feed to produce copper-gold beneficiation I ② concentrate and copper-gold beneficiation I ② tailings. Copper-gold beneficiation I ② tailings are added with collector A23 and then used as feed for copper-gold beneficiation I scavenging flotation to produce copper-gold beneficiation I scavenging concentrate and copper-gold beneficiation I tailings.

[0046] Step 4, Copper-Gold Refinement II Operation. The Copper-Gold Refinement II Operation is an open-loop + closed-loop process consisting of two refinements and one fine sweep. The Copper-Gold Refinement I① concentrate obtained in step (3) is used as feed for Copper-Gold Refinement II① flotation, producing Copper-Gold Refinement II① concentrate and Copper-Gold Refinement II① tailings. The Copper-Gold Refinement II① tailings and the Copper-Gold Refinement I② concentrate obtained in step (3) are used as feed for Copper-Gold Refinement II② flotation, producing Copper-Gold Refinement II② concentrate and Copper-Gold Refinement II② tailings. Collector A23 is added to the Copper-Gold Refinement I② tailings to adjust the slurry and use it as feed for Copper-Gold Refinement II scavenging flotation, producing Copper-Gold Refinement II scavenging concentrate and Copper-Gold Refinement II tailings.

[0047] Step 5: Using the mud gold rough concentrate condition modifier T-YF and collector A23 obtained in step (1) as feed, perform one roughing, one cleaning and one scavenging operation to produce gold mud separation flotation gold concentrate and gold mud separation tailings.

[0048] Step 6: Using the copper-gold concentrate I tailings obtained in step (3), the copper-gold concentrate II tailings obtained in step (4), and the mud-gold separation tailings obtained in step (5) as feed, perform Nelson gravity separation for enhanced gold recovery beneficiation to produce gravity gold concentrate and gravity tailings.

[0049] Step 7, Step (4) obtains copper-gold concentrate II ① and copper-gold concentrate II ② and combines them as the final copper-gold concentrate. Step (5) separates gold mud flotation concentrate and Step (6) combines gravity separation gold concentrate as the final gold concentrate. Step (2) copper-gold roughing tailings and (6) gravity separation tailings are combined as the final tailings. The product structure is copper-gold concentrate, gold concentrate and tailings.

[0050] In this embodiment, under conditions of 0.68% copper grade and 1.51 g / t gold grade, a gold concentrate with a gold grade of 68.20 g / t and a recovery rate of 28.32% was obtained; a copper-gold concentrate with a copper grade of 18.19% and a copper recovery rate of 41.28%; and a gold grade of 32.11 g / t and a gold recovery rate of 46.59% was obtained. The overall copper recovery rate was 41.28%, and the overall gold recovery rate was 74.91%.

[0051] Example 3: The steps described in Example 2 were followed during on-site production at a high-magnesium talc-type copper oxide gold mine.

[0052] Under conditions of 0.54% copper grade and 1.68 g / t gold grade, the gold concentrate yielded a gold grade of 72.36 g / t with a recovery rate of 25.34%, and the copper-gold concentrate yielded a copper grade of 16.89% with a copper recovery rate of 38.01%, and a gold grade of 35.43 g / t with a gold recovery rate of 41.91%. The overall copper recovery rate was 38.01%, and the overall gold recovery rate was 67.25%.

[0053] Example 4: An experiment was conducted on a serpentine and chlorite type high-magnesium, high-alteration copper-gold ore with a copper grade of 2.10% and a gold grade of 4.87 g / t.

[0054] Step 1 is the same as step (1) in Example 2.

[0055] Step 2: Using the desliming flotation tailings from step (1) as feed, add modifiers T-YF, sodium hydrosulfide, ammonium sulfate, and collectors kerosene, A23, and butyl ammonium black powder to adjust the slurry before carrying out copper-gold roughing operation to produce copper-gold rough concentrate and copper-gold roughing tailings.

[0056] Steps 3, 4, 5, 6, and 7 are the same as steps (3), (4), (5), (6), and (7) in Example 2.

[0057] Under conditions of 2.10% copper grade and 4.87 g / t gold grade, the gold concentrate obtained had a gold grade of 108.83 g / t and a recovery rate of 31.13%. The copper-gold concentrate had a copper grade of 16.39% and a copper recovery rate of 52.88%, and a gold grade of 45.61 g / t and a gold recovery rate of 43.49%. The overall copper recovery rate was 52.88%, and the overall gold recovery rate was 74.62%.

[0058] Example 5: An experiment was conducted using a clay-type high-magnesium, high-alteration copper oxide concentrate with a copper grade of 0.90% and a gold grade of 2.18 g / t.

[0059] The implementation steps are as described in Example 3.

[0060] Under conditions of 0.90% copper grade and 2.18 g / t gold grade, the gold concentrate obtained had a gold grade of 32.10 g / t and a recovery rate of 21.33%. The copper-gold concentrate had a copper grade of 14.98% and a copper recovery rate of 42.81%, and a gold grade of 33.89 g / t and a gold recovery rate of 37.33%. The overall copper recovery rate was 42.81%, and the overall gold recovery rate was 58.66%.

Claims

1. A process for the integrated recovery of copper and gold from high-magnesium altered copper oxide gold ores, characterised in that, The method comprises the following steps: The first step, the raw ore is ground and the gold mud is floated, and the gold mud rough concentrate and the desliming flotation tailings are produced; The second step, the desliming flotation tailings are used as the feed ore, and the copper-gold roughing operation is carried out, and the copper-gold rough concentrate and the copper-gold roughing tailings are produced; The third step, the copper-gold rough concentrate is used as the feed ore, and the copper-gold concentration I operation is carried out, the copper-gold concentration I operation is an open loop + closed loop process of two times of concentration, one time of cleaning, and the copper-gold concentration I cleaning concentrate and the copper-gold concentration I tailings are produced; The fourth step, the concentrate obtained by the first concentration of the copper-gold concentration I operation is used as the feed ore, and the copper-gold concentration II operation is carried out, the copper-gold concentration II operation is an open loop + closed loop process of two times of concentration, one time of cleaning, and the copper-gold concentration II cleaning concentrate and the copper-gold concentration II tailings are produced; The fifth step, the gold mud rough concentrate produced in the first step is used as the feed ore, and the gold mud separation flotation operation is carried out, and the gold mud separation flotation gold concentrate and the gold mud separation tailings are produced; wherein, the gold mud separation flotation operation is carried out by one time of roughing, one time of concentration and one time of cleaning operation; The sixth step, the copper-gold concentration I tailings, the copper-gold concentration II tailings and the gold mud separation tailings are used as the feed ore, and the Nelson gravity separation gold intensified recovery operation is carried out, and the gravity separation gold concentrate and the gravity separation tailings are produced. In the third step, the copper-gold concentration I operation is an open loop + closed loop process of two times of concentration, one time of cleaning, and the copper-gold concentration I cleaning concentrate and the copper-gold concentration I tailings are produced, which comprises that the copper-gold rough concentrate is subjected to one time of copper-gold concentration I flotation, and the copper-gold concentration I one time concentrate and the copper-gold concentration I one time tailings are produced, the copper-gold concentration I two time flotation is carried out by using the copper-gold concentration I one time tailings as the feed ore, and the copper-gold concentration I two time concentrate and the copper-gold concentration I two time tailings are produced, and the copper-gold concentration I cleaning flotation is carried out by using the copper-gold concentration I two time tailings as the feed ore, and the copper-gold concentration I cleaning concentrate and the copper-gold concentration I tailings are produced. After the copper-gold concentration I cleaning flotation, the copper-gold concentration I cleaning concentrate is produced, and the copper-gold concentration I two time tailings is returned to the feed ore, so that the copper-gold concentration I operation is realized as an open loop + closed loop process.

2. The copper-gold comprehensive recovery process of high-magnesium altered copper-gold ore according to claim 1, characterized in that, Further comprising that the copper-gold concentration II one time concentrate and the copper-gold concentration II two time concentrate are combined as the final copper-gold concentrate, and the gold mud separation flotation gold concentrate obtained in the fifth step and the gravity separation gold concentrate obtained in the sixth step are combined as the final gold concentrate. The copper-gold roughing tailings in the second step and the gravity separation tailings in the sixth step are combined as the final tailings.

3. The copper-gold comprehensive recovery process of high-magnesium altered copper-gold ore according to claim 1, characterized in that, In the fourth step, the copper-gold concentration II operation is an open loop + closed loop process of two times of concentration, one time of cleaning, and the copper-gold concentration II cleaning concentrate and the copper-gold concentration II tailings are produced, which comprises that the copper-gold concentration I one time concentrate obtained in the third step is used as the feed ore, and the copper-gold concentration II one time flotation is carried out, and the copper-gold concentration II one time concentrate and the copper-gold concentration II one time tailings are produced, the copper-gold concentration II two time flotation is carried out by using the copper-gold concentration II one time tailings and the copper-gold concentration I two time concentrate obtained in the third step as the feed ore, and the copper-gold concentration II two time concentrate and the copper-gold concentration II two time tailings are produced, and the copper-gold concentration II cleaning flotation is carried out by using the copper-gold concentration I two time tailings as the feed ore, and the copper-gold concentration II cleaning concentrate and the copper-gold concentration II tailings are produced.

4. The copper-gold comprehensive recovery process of high-magnesium altered copper-gold ore according to claim 3, characterized in that, After the copper-gold concentration II cleaning flotation, the copper-gold concentration II cleaning concentrate is produced, and the copper-gold concentration II two time tailings is returned to the feed ore, so that the copper-gold concentration II operation is realized as an open loop + closed loop process.

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