Copper and gold comprehensive recovery process for high-magnesium alteration copper oxide gold ore

Abstract

The invention relates to the technical field of mineral separation, in particular to a copper and gold comprehensive recovery process for high-magnesium alteration copper oxide gold ore, which comprises the following steps: step 1, raw ore is subjected to ore grinding and mud gold floatable roughing desliming flotation operation, and mud gold rough concentrate and desliming flotation tailings are produced; secondly, the desliming flotation tailings serve as feeding ores, copper and gold roughing operation is carried out, and copper and gold rough concentrate and copper and gold roughing tailings are produced; thirdly, the copper and gold rough concentrate serves as feeding ore, copper and gold concentration I operation is conducted, the copper and gold concentration I operation is an open-loop and closed-loop process of two-time concentration and one-time concentration sweeping, and copper and gold concentration I scavenging concentrate and copper and gold concentration I tailings are produced; according to the method, through floatable desliming-mud-gold separation of mud and gold and the like, the use amount of the slime inhibitor is reduced while the influence of subsequent slime on copper oxide mineral flotation is reduced, so that the concentration of the slime inhibitor during copper-gold flotation is reduced, inhibition of the inhibitor on copper minerals is further reduced, and the floatability of the copper-gold minerals is indirectly improved.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a copper-gold comprehensive recovery process of high-magnesium altered copper-gold oxidized ore. Background Art

[0002] The lithology of surface oxidized copper ore varies greatly due to the differences in the degree of skarnization and further alteration, but it is generally rich in calcium and magnesium, which makes it easy to muddy during the grinding process. The alteration products talc, chlorite and serpentine have very good floatability. During the flotation process, they compete with copper and gold minerals for reagent adsorption, mineral surface coverage and small floatability differences, making the copper and gold selectivity of this type of ore poor and difficult to separate and recover. Its separation and recovery is a difficult problem in mineral processing. The technical research of this type of ore is of great significance in order to achieve technological breakthroughs and resource utilization. Summary of the invention

[0003] The present invention provides a comprehensive copper and gold recovery process for high-magnesium altered copper-gold ore, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of large influence of ore mud, poor concentrate quality and low recovery rate in flotation recovery of high-magnesium altered copper-gold ore.

[0004] In order to solve the above problems, the present invention discloses a copper-gold comprehensive recovery process for high-magnesium altered copper-gold ore, comprising the following steps: In the first step, the raw ore is ground and subjected to rough desludging and flotation operations to produce rough gold concentrate and desludging flotation tailings. The second step is to use the desludging flotation tailings as feed to carry out copper-gold roughing operations to produce copper-gold rough concentrate and copper-gold roughing tailings; The third step is to use the copper-gold rough concentrate as the feed ore to carry out the copper-gold concentration I operation. The copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration I sweep concentrate and copper-gold concentration I tailings; The fourth step is to use the concentrate obtained from the first concentration of copper-gold concentration I operation as feed ore for copper-gold concentration II operation. The copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration II sweep concentrate and copper-gold concentration II tailings; The fifth step is to use the gold mud rough concentrate produced in the first step as feed ore to carry out gold mud separation flotation operation, and produce gold mud separation flotation gold concentrate and gold mud separation tailings; wherein, the gold mud separation flotation operation is carried out through one roughing operation, one fine selection operation and one scavenging operation; The sixth step is to use the copper-gold concentration I tailings, copper-gold concentration II tailings and mud gold separation tailings as feed ore to carry out Nelson gravity gold enhanced recovery and beneficiation to produce gravity gold concentrate and gravity tailings.

[0005] The above also includes combining the primary concentrate of copper-gold concentration II and the secondary concentrate of copper-gold concentration II as the final copper-gold concentrate; combining the gold mud separation flotation gold concentrate obtained in the fifth step and the gravity separation gold concentrate in the sixth step as the final gold concentrate; combining the copper-gold rougher tailings in the second step and the gravity separation tailings in the sixth step as the final tailings.

[0006] In the third step mentioned above, the copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweeping, which produces copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings, including: copper-gold rough concentrate is subjected to copper-gold concentration I primary flotation to produce copper-gold concentration I primary concentrate and copper-gold concentration I primary tailings, copper-gold concentration I primary tailings are used as feed for copper-gold concentration I secondary flotation to produce copper-gold concentration I secondary concentrate and copper-gold concentration I secondary tailings, copper-gold concentration I secondary tailings are used as feed for copper-gold concentration I scavenging flotation to produce copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings.

[0007] The above-mentioned copper-gold concentration I scavenging and flotation produces copper-gold concentration I scavenging concentrate, which is returned to the copper-gold concentration I secondary tailings feed, realizing the open-loop + closed-loop process of the copper-gold concentration I operation.

[0008] In the fourth step mentioned above, the copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one concentration sweeping, which produces copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings, including: using the copper-gold concentration I primary concentrate obtained in the third step as feed ore, carrying out copper-gold concentration II primary flotation, producing copper-gold concentration II primary concentrate and copper-gold concentration II primary tailings, using the copper-gold concentration II primary tailings and the copper-gold concentration I secondary concentrate obtained in the third step as feed ore for copper-gold concentration II secondary flotation, producing copper-gold concentration II secondary concentrate and copper-gold concentration II secondary tailings, and using the copper-gold concentration I secondary tailings as feed ore for copper-gold concentration II scavenging flotation, producing copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings.

[0009] The above-mentioned copper-gold concentration II scavenging and flotation produces copper-gold concentration II scavenging concentrate, which is returned to the copper-gold concentration II secondary tailings feed, realizing the open-circuit + closed-loop process of the copper-gold concentration II operation.

[0010] Compared with the prior art, the present invention has the following advantages: 1. The present invention reduces the influence of subsequent ore slime on the flotation of copper oxide minerals through floatable desludging and gold mud separation, while reducing the dosage of ore slime inhibitors, thereby reducing the concentration of ore slime inhibitors during copper-gold flotation, further reducing the inhibition of the inhibitors on copper minerals, and indirectly improving the floatability of copper-gold minerals.

[0011] 2. The present invention adopts open-circuit and closed-loop flotation for copper and gold concentration. Under the condition of ensuring that the open-circuit flotation operation obtains a higher concentrate quality and obtains a basic recovery rate, the concentrate is produced in two steps to stabilize and improve the operation recovery rate. The concentration and scavenging are used to strengthen the operation recovery and dilute the flotation operation tailings to achieve the purpose of efficient flotation.

[0012] 3. The present invention uses Nelson gravity separation to strengthen gold recovery through gold separation and copper-gold concentration of depleted tailings.

[0013] In summary, the present invention solves the problems of large impact of ore slime, poor concentrate quality and low recovery rate in flotation recovery of high-magnesium altered copper-gold ore, and develops a process with good flotation product quality, high metal recovery efficiency, and a stable and easy-to-operate process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0015] Figure 1 The process flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0017] Example 1: The present invention discloses a copper-gold comprehensive recovery process for high-magnesium altered copper-gold ore, comprising the following steps: In the first step, the raw ore is ground and subjected to rough desludging and flotation operations to produce rough gold concentrate and desludging flotation tailings. The second step is to use the desludging flotation tailings as feed to carry out copper-gold roughing operations to produce copper-gold rough concentrate and copper-gold roughing tailings; The third step is to use the copper-gold rough concentrate as the feed ore to carry out the copper-gold concentration I operation. The copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration I sweep concentrate and copper-gold concentration I tailings; The fourth step is to use the concentrate obtained from the first concentration of copper-gold concentration I operation as feed ore for copper-gold concentration II operation. The copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration II sweep concentrate and copper-gold concentration II tailings; The fifth step is to use the gold mud rough concentrate produced in the first step as feed ore to carry out gold mud separation flotation operation, and produce gold mud separation flotation gold concentrate and gold mud separation tailings; wherein, the gold mud separation flotation operation is carried out through one roughing operation, one fine selection operation and one scavenging operation; The sixth step is to use the copper-gold concentration I tailings, copper-gold concentration II tailings and mud gold separation tailings as feed ore to carry out Nelson gravity gold enhanced recovery and beneficiation to produce gravity gold concentrate and gravity tailings.

[0018] In the third step mentioned above, the copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweeping, which produces copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings, including: copper-gold rough concentrate is subjected to copper-gold concentration I primary flotation to produce copper-gold concentration I primary concentrate and copper-gold concentration I primary tailings, copper-gold concentration I primary tailings are used as feed for copper-gold concentration I secondary flotation to produce copper-gold concentration I secondary concentrate and copper-gold concentration I secondary tailings, copper-gold concentration I secondary tailings are used as feed for copper-gold concentration I scavenging flotation to produce copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings.

[0019] The above-mentioned copper-gold concentration I scavenging and flotation produces copper-gold concentration I scavenging concentrate, which is returned to the copper-gold concentration I secondary tailings feed, realizing the open-loop + closed-loop process of the copper-gold concentration I operation.

[0020] In the fourth step mentioned above, the copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one concentration sweeping, which produces copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings, including: using the copper-gold concentration I primary concentrate obtained in the third step as feed ore, carrying out copper-gold concentration II primary flotation, producing copper-gold concentration II primary concentrate and copper-gold concentration II primary tailings, using the copper-gold concentration II primary tailings and the copper-gold concentration I secondary concentrate obtained in the third step as feed ore for copper-gold concentration II secondary flotation, producing copper-gold concentration II secondary concentrate and copper-gold concentration II secondary tailings, and using the copper-gold concentration I secondary tailings as feed ore for copper-gold concentration II scavenging flotation, producing copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings.

[0021] The above-mentioned copper-gold concentration II scavenging and flotation produces copper-gold concentration II scavenging concentrate, which is returned to the copper-gold concentration II secondary tailings feed, realizing the open-circuit + closed-loop process of the copper-gold concentration II operation.

[0022] The process of obtaining the above-mentioned copper-gold concentration II primary concentrate is: the first step is the rough selection and desludging flotation operation of mud gold and other floatable roughing operations, the second step is the rough selection of copper and gold, the third step is the primary selection of copper and gold concentration I and the fourth step is the primary selection of copper and gold concentration II. There is no return of middlings and it is not affected by the drug-carrying ore mud obtained from operations other than the obtaining operations. It is a high-quality copper-gold concentrate.

[0023] The process of obtaining the above-mentioned copper-gold concentration II secondary concentrate is: feeding the copper-gold concentration I secondary concentrate in the third step, feeding the copper-gold concentration II primary concentrate in the fourth step, feeding the copper-gold concentration II scavenging concentrate after scavenging flotation, and then obtaining the copper-gold concentration II secondary concentrate, which is the copper-gold concentrate obtained by enhanced recovery of copper and gold.

[0024] The above-mentioned copper-gold concentration II primary concentrate and copper-gold concentration II secondary concentrate are combined as the final copper-gold concentrate, the gold concentrate through the fifth step of gold mud separation flotation and the gold concentrate through the sixth step of gravity separation are combined as the final gold concentrate, the copper-gold rougher tailings in the second step and the gravity separation tailings in the sixth step are combined as the final tailings, and the product structure is copper-gold concentrate, gold concentrate and tailings.

[0025] In summary, the embodiments of the present invention can reduce the influence of subsequent ore slime on the flotation of copper oxide minerals through floatable desludging and gold mud separation, thereby reducing the dosage of ore slime inhibitors, thereby reducing the concentration of ore slime inhibitors during copper-gold flotation, further reducing the inhibition of copper minerals by inhibitors, and indirectly improving the floatability of copper-gold minerals.

[0026] In addition, the present invention adopts open-circuit and closed-loop flotation for copper and gold concentration. Under the condition of ensuring that the open-circuit flotation operation obtains a higher concentrate quality and obtains a basic recovery rate, the concentrate is produced in two steps to stabilize and improve the operation recovery rate, and the concentration and scavenging are used to strengthen the operation recovery and deplete the flotation operation tailings to achieve the purpose of efficient flotation.

[0027] Furthermore, the present invention strengthens gold recovery by using Nelson gravity separation to concentrate the gold mud separation and copper-gold concentrated depleted tailings.

[0028] Therefore, the present invention solves the problems of large impact of ore slime, poor concentrate quality and low recovery rate in flotation recovery of high-magnesium altered copper-gold ore, and develops a process with good flotation product quality, high metal recovery efficiency, and a stable and easy-to-operate process.

[0029] Example 2: Tests were conducted on a talc-type high-magnesium, highly altered, oxidized copper-gold mine in Kyrgyzstan with a copper grade of 0.68% and a gold grade of 1.51 g / t: Step 1: After adding pH adjuster lime to the ore for grinding, add frother MIBC and collector A23, and produce mud gold concentrate and desludging flotation tailings through rough separation of mud gold and other substances.

[0030] Step 2, using the desludging flotation tailings of step (1) as feed, adding adjusting agent T-YF, sodium hydrosulfide, ammonium sulfate and collector light white oil, A23 for slurry preparation, and then performing copper-gold roughing operation to produce copper-gold rough concentrate and copper-gold roughing tailings.

[0031] Step 3, the copper-gold rough concentrate obtained in step (2) is added with adjusting agent T-YF and collector A23 for slurry adjustment and used as feed ore for copper-gold concentration I operation. The copper-gold concentration I operation is an open-loop + closed-loop process of two concentrations and one fine sweeping, that is, the copper-gold rough concentrate is subjected to copper-gold concentration I① flotation to produce copper-gold concentration I① concentrate and copper-gold concentration I① tailings, the copper-gold concentration I① tailings are used as feed ore for copper-gold concentration I② flotation to produce copper-gold concentration I② concentrate and copper-gold concentration I② tailings, the copper-gold concentration I② tailings are added with collector A23 and used as feed ore for copper-gold concentration I scavenging flotation to produce copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings.

[0032] Step 4, copper-gold concentration II operation. The copper-gold concentration II operation is an open-loop + closed-loop process of two concentrations and one fine sweeping. The copper-gold concentration I① concentrate obtained in step (3) is used as the feed ore for copper-gold concentration II① flotation to produce copper-gold concentration II① concentrate and copper-gold concentration II① tailings. The copper-gold concentration II① tailings and the copper-gold concentration I② concentrate obtained in step (3) are used as feed ore for copper-gold concentration II② flotation to produce copper-gold concentration II② concentrate and copper-gold concentration II② tailings. The copper-gold concentration I② tailings are added with collector A23 to prepare a slurry as the feed ore for copper-gold concentration II scavenging flotation to produce copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings.

[0033] Step 5, using the condition adjuster T-YF and collector A23 obtained in step (1) as feed ore after slurrying, and performing one roughing, one fine separation and one scavenging operation to produce gold mud separation flotation gold concentrate and gold mud separation tailings.

[0034] Step 6, using the copper-gold concentration I tailings obtained in step (3), the copper-gold concentration II obtained in step (4) and the mud gold separation tailings obtained in step (5) as feed, Nelson gravity gold enhanced recovery beneficiation is carried out to produce gravity gold concentrate and gravity tailings.

[0035] Step 7, the copper-gold concentrate II① concentrate and the copper-gold concentrate II② concentrate obtained in step (4) are combined as the final copper-gold concentrate, the gold concentrate obtained from the gold mud separation flotation in step (5) and the gold concentrate obtained from the gravity separation in step (6) are combined as the final gold concentrate, the copper-gold rougher tailings in step (2) and the gravity separation tailings in step (6) are combined as the final tailings, and the product structure is copper-gold concentrate, gold concentrate and tailings.

[0036] In this embodiment, under the conditions of copper grade of 0.68% and gold grade of 1.51g / t, the gold concentrate with gold grade of 68.20g / t and recovery rate of 28.32% was obtained, the copper-gold concentrate with copper grade of 18.19%, copper recovery rate of 41.28%, gold grade of 32.11g / t and gold recovery rate of 46.59% was obtained. The comprehensive recovery rate of copper was 41.28%, and the comprehensive recovery rate of gold was 74.91%.

[0037] Example 3: The steps described in Example 2 are obtained during the on-site production process of high-magnesium talc-type copper-gold oxide ore: Under the conditions of copper grade of 0.54% and gold grade of 1.68g / t, the gold concentrate with gold grade of 72.36g / t and recovery rate of 25.34% was obtained. The copper-gold concentrate with copper grade of 16.89%, copper recovery rate of 38.01%, gold grade of 35.43g / t and gold recovery rate of 41.91% was obtained. The comprehensive recovery rate of copper was 38.01% and the comprehensive recovery rate of gold was 67.25%.

[0038] Example 4, a test was conducted on a serpentine-chlorite type high-magnesium, highly altered oxidized copper-gold ore with a copper grade of 2.10% and a gold grade of 4.87 g / t; Step 1 is the same as step (1) in Example 2.

[0039] Step 2, using the desludging flotation tailings of step (1) as feed, adding adjusting agent T-YF, sodium hydrosulfide, ammonium sulfate and collecting agent kerosene, A23, butyl ammonium black powder to mix the slurry and then carry out copper-gold roughing operation to produce copper-gold rough concentrate and copper-gold roughing tailings.

[0040] Steps 3, 4, 5, 6, and 7 are the same as steps (3), (4), (5), (6), and (7) in Example 2.

[0041] Under the conditions of copper grade of 2.10% and gold grade of 4.87g / t, the gold concentrate with gold grade of 108.83g / t and recovery rate of 31.13% was obtained, the copper-gold concentrate with copper grade of 16.39%, copper recovery rate of 52.88%, gold grade of 45.61g / t and gold recovery rate of 43.49% was obtained. The comprehensive recovery rate of copper was 52.88% and the comprehensive recovery rate of gold was 74.62%.

[0042] Example 5: A test was conducted using a clay-type high-magnesium, highly altered copper oxide concentrate with a copper grade of 0.90% and a gold grade of 2.18 g / t.

[0043] The implementation steps are according to Example 3.

[0044] Under the conditions of copper grade of 0.90% and gold grade of 2.18g / t, the gold concentrate with gold grade of 32.10g / t and recovery rate of 21.33% was obtained, the copper-gold concentrate with copper grade of 14.98%, copper recovery rate of 42.81%, gold grade of 33.89g / t and gold recovery rate of 37.33% was obtained. The comprehensive recovery rate of copper was 42.81% and the comprehensive recovery rate of gold was 58.66%.

Claims

1. A comprehensive copper-gold recovery process for high-magnesium altered copper-gold ore, characterized in that: The following steps are involved: In the first step, the raw ore is ground and subjected to rough desludging and flotation operations to produce rough gold concentrate and desludging flotation tailings. The second step is to use the desludging flotation tailings as feed to carry out copper-gold roughing operations to produce copper-gold rough concentrate and copper-gold roughing tailings; The third step is to use the copper-gold rough concentrate as the feed ore to carry out the copper-gold concentration I operation. The copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration I sweep concentrate and copper-gold concentration I tailings; The fourth step is to use the concentrate obtained from the first concentration of copper-gold concentration I operation as feed ore for copper-gold concentration II operation. The copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one fine sweep, which produces copper-gold concentration II sweep concentrate and copper-gold concentration II tailings; The fifth step is to use the gold mud rough concentrate produced in the first step as feed ore to carry out gold mud separation flotation operation, and produce gold mud separation flotation gold concentrate and gold mud separation tailings; wherein, the gold mud separation flotation operation is carried out through one roughing operation, one fine selection operation and one scavenging operation; The sixth step is to use the copper-gold concentration I tailings, copper-gold concentration II tailings and mud gold separation tailings as feed ore to carry out Nelson gravity gold enhanced recovery and beneficiation to produce gravity gold concentrate and gravity tailings.

2. The copper-gold comprehensive recovery process of a high-magnesium altered copper-gold ore according to claim 1, characterized in that: It also includes combining the primary concentrate of copper-gold concentration II and the secondary concentrate of copper-gold concentration II as the final copper-gold concentrate; combining the gold concentrate of gold mud separation flotation obtained in the fifth step and the gold concentrate of gravity separation in the sixth step as the final gold concentrate; The copper-gold rougher 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 a high-magnesium altered copper-gold ore according to claim 1, characterized in that: In the third step, the copper-gold concentration I operation is an open-circuit + closed-loop process of two concentrations and one fine sweeping, producing copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings, including: copper-gold rough concentrate is subjected to copper-gold concentration I primary flotation to produce copper-gold concentration I primary concentrate and copper-gold concentration I primary tailings, copper-gold concentration I primary tailings are used as feed for copper-gold concentration I secondary flotation to produce copper-gold concentration I secondary concentrate and copper-gold concentration I secondary tailings, copper-gold concentration I secondary tailings are used as feed for copper-gold concentration I scavenging flotation to produce copper-gold concentration I scavenging concentrate and copper-gold concentration I tailings.

4. The copper-gold comprehensive recovery process of a high-magnesium altered copper-gold ore according to claim 3, characterized in that: The copper-gold concentration I scavenging flotation produces copper-gold concentration I scavenging concentrate, which is returned to the copper-gold concentration I secondary tailings feed, realizing the open-loop + closed-loop process of the copper-gold concentration I operation.

5. A copper-gold comprehensive recovery process for high-magnesium altered copper-gold ore according to claim 3 or 4, characterized in that: In the fourth step, the copper-gold concentration II operation is an open-circuit + closed-loop process of two concentrations and one concentration sweeping, producing copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings, including: using the copper-gold concentration I primary concentrate obtained in the third step as feed ore, carrying out copper-gold concentration II primary flotation, producing copper-gold concentration II primary concentrate and copper-gold concentration II primary tailings, using the copper-gold concentration II primary tailings and the copper-gold concentration I secondary concentrate obtained in the third step as feed ore for copper-gold concentration II secondary flotation, producing copper-gold concentration II secondary concentrate and copper-gold concentration II secondary tailings, and using the copper-gold concentration I secondary tailings as feed ore for copper-gold concentration II scavenging flotation, producing copper-gold concentration II scavenging concentrate and copper-gold concentration II tailings.

6. The copper-gold comprehensive recovery process of a high-magnesium altered copper-gold ore according to claim 5, characterized in that: After scavenging and flotation, Copper-Gold Concentrator II scavenging concentrate is produced and returned to the Copper-Gold Concentrator II secondary tailings feeder, realizing the open-loop + closed-loop process of Copper-Gold Concentrator II operation.

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