A method of separating a lead-zinc oxide ore

Abstract

The application relates to a lead-zinc oxide ore separation method, which comprises the following steps: step one) adding a zinc sulfide inhibitor, a lead collector and a foaming agent into a lead-zinc oxide ore slurry for flotation, performing multiple lead scavenging on a lead roughing tailing slurry to obtain a lead separation tailing; performing multiple cleaning on a lead rough concentrate to obtain a lead concentrate, performing cyclone desliming on middlings generated in each cleaning, and sending the sand of the deslimed middlings to lead scavenging; step two) adding a zinc sulfide activator, a zinc sulfide collector and a foaming agent into the lead separation tailing for flotation; performing multiple zinc sulfide scavenging on a zinc sulfide roughing tailing slurry to obtain a zinc sulfide tailing; performing multiple cleaning on a zinc sulfide rough concentrate to obtain a cleaned zinc sulfide ore, performing cyclone desliming on middlings generated in each cleaning, and sending the sand of the deslimed middlings to zinc sulfide scavenging; and step three) performing zinc oxide flotation on the zinc sulfide tailing to obtain a zinc oxide concentrate and a tailing.

Description

Technical Field

[0001] This invention relates to the field of mineral sorting and processing technology, and specifically to a method for sorting oxidized lead-zinc ore. Background Technology

[0002] The complex mineral composition, high content of fine slime and soluble salts in clay-bearing oxidized lead-zinc ores make them extremely difficult to beneficiate, resulting in unsatisfactory zinc recovery rates in conventional flotation. Currently, the most commonly used beneficiation process for clay-bearing oxidized lead-zinc ores is the sulfide-amine process. The sulfide-amine process is highly sensitive to slime and generally requires desliming flotation. Traditional processes typically deslim the zinc oxide flotation feed or raw ore, resulting in large and difficult-to-control desliming volumes, leading to significant zinc oxide metal loss. Furthermore, beneficiation indicators fluctuate greatly with desliming effectiveness, making stable on-site production difficult. To achieve better beneficiation results, beneficiators have experimented with various methods in recent years, such as flocculation flotation, carrier flotation, flotation using chelating collectors, sulfide roasting-flotation, and combined processes. However, these processes have not yet achieved breakthrough progress, and low flotation recovery rates for complex oxidized lead-zinc ores remain a persistent challenge in the beneficiation industry.

[0003] Therefore, it is necessary to develop a new method for separating oxidized lead-zinc ore to solve the problem of low overall recovery rate in the flotation of oxidized lead-zinc ore in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a method for separating oxidized lead-zinc ore, thereby solving the problem of low overall recovery rate in the flotation of oxidized lead-zinc ore. This invention is achieved using the following technical solution:

[0005] A method for separating lead-zinc oxide ore includes the following steps:

[0006] Step 1) Add zinc sulfide inhibitor, lead collector and frother to lead oxide zinc ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate; perform multiple lead scavenging on the lead roughing tailings slurry to obtain lead tailings, and return the scavenging concentrate obtained from each lead scavenging to the previous stage; perform multiple fine cleaning on the lead rough concentrate to obtain lead concentrate, and deslim the middlings produced from each fine cleaning is deslimed by hydrocyclone, and the undersludge after desliming of the middlings is sent to lead scavenging.

[0007] Step 2) Add zinc sulfide activator, zinc sulfide collector and frother to lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform multiple zinc sulfide scavenging on the zinc sulfide rough tailings slurry to obtain zinc sulfide tailings, and return the scavenged concentrate obtained from each zinc sulfide scavenging to the previous stage; perform multiple fine cleaning on the zinc sulfide rough concentrate to obtain fine zinc sulfide ore, and deslim the middlings produced from each fine cleaning is performed by hydrocyclone, and the undersludge after desliming of the middlings is sent to zinc sulfide scavenging;

[0008] Step 3) Perform zinc oxide flotation on the zinc sulfide tailings to obtain zinc oxide concentrate and tailings.

[0009] Optionally, the zinc sulfide inhibitor is zinc sulfate and sodium sulfite, with the ratio of zinc sulfate to sodium sulfite being 1:0.5 to 1.

[0010] Optionally, the lead collector is at least one of the following: No. 25 black powder, butylammonium black powder, isobutyl sodium black powder, etc.

[0011] Optionally, in step one), the lead concentrate is cleaned three times, with zinc sulfide inhibitor added during each cleaning process;

[0012] In step one), the lead concentrate is subjected to a second lead scavenging process, and a lead collector is added in each lead scavenging process.

[0013] Optionally, the zinc sulfide collector is at least one of butyl xanthate, pentylenetetrazine, isobutyl xanthate, and isoamyl xanthate; the zinc sulfide activator is copper sulfate.

[0014] Optionally, in step three), the zinc sulfide tailings are first deslimed using a hydrocyclone to remove overflow, increasing the concentration of zinc sulfide tailings to 40-45%. Then, slurry conditioner, zinc oxide activator, and zinc oxide collector are added, mixed evenly, and then diluted with water to reduce the concentration of zinc sulfide tailings to 15-25% before flotation.

[0015] Optionally, in step two), pyrite inhibitors and zinc sulfide collectors are added to the obtained refined zinc sulfide ore to carry out zinc-sulfur separation flotation, thereby obtaining zinc sulfide concentrate and sulfur concentrate.

[0016] Optionally, in step three, zinc oxide flotation is performed on the zinc sulfide flotation tailings. This operation includes pulp thickening followed by pulp conditioning, and two roughing stages after pulp dilution. The pulp is thickened to a concentration of 40-45%, and then sodium carbonate, sodium hexametaphosphate, sodium sulfide, and zinc oxide collector are added for pulp conditioning. After the reagents have fully acted, the pulp concentration is diluted with water to 15-25% for flotation. This stage yields zinc oxide concentrate and final tailings.

[0017] Optionally, the zinc oxide collector is composed of an amine cationic collector and a chelating collector in a ratio of 10 to 20:1.

[0018] The amine cationic collector can be one or more of the amine collectors such as dodecylamine, octadecylamine, and mixed amines, and the chelating collector can be one or more of the hydroxamic acids such as benzyl hydroxamic acid, salicylic acid, and octyl hydroxamic acid.

[0019] Optionally, the foaming agent is one or more of the following: No. 2 oil, MIBC, polyethylene glycol methyl ether, etc.

[0020] Optionally, the lead-zinc oxide ore slurry is prepared by grinding the lead-zinc oxide ore and sodium sulfide in a mill, with the sodium sulfide addition amount being 500-1500 g / t; the final fineness of the ore is 75%-85% of the particles being -0.074 mm, and the final mass concentration of the slurry fed into the mill is 30%-35%.

[0021] Optionally, in step one), 600-800 g / t of zinc sulfate, 300-400 g / t of sodium sulfite, 60-80 g / t of lead collector, and 25-30 g / t of frother are added to the lead-zinc oxide ore slurry; 10-15 g / t of lead collector is added to the first scavenging, and 5-10 g / t of lead collector is added to the second scavenging to obtain lead tailings; the lead rough concentrate is subjected to three cleaning processes: 200-250 g / t of zinc sulfate and 100-150 g / t of sodium sulfite are added to the first cleaning, 100-150 g / t of zinc sulfate and 50-100 g / t of sodium sulfite are added to the second cleaning, and 50-60 g / t of zinc sulfate and 20-25 g / t of sodium sulfite are added to the third cleaning to obtain lead concentrate.

[0022] In step two), 150-200 g / t of copper sulfate, 60-80 g / t of zinc sulfide collector, and 25-30 g / t of No. 2 oil are added to the lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry. The zinc sulfide rough tailings slurry is then subjected to two zinc sulfide scavenging processes. In the first scavenging process, 20-30 g / t of zinc sulfide collector is added, and in the second scavenging process, 10-15 g / t of zinc sulfide collector is added.

[0023] In step three), 2500–3000 g / t of sodium carbonate, 250–300 g / t of sodium hexametaphosphate, 7000–8000 g / t of sodium sulfide, 80–100 g / t of amine cationic collector, and 20–30 g / t of chelating collector are added to the zinc sulfide tailings and mixed thoroughly. This mixture is then subjected to a first-stage roughing flotation of zinc oxide. A second-stage roughing flotation is then performed with 1500–2000 g / t of sodium sulfide and 60–100 g / t of dodecylamine to obtain zinc oxide concentrate and tailings.

[0024] Optionally, the zinc sulfide ore is roughed by adding 2000-2500 g / t calcium oxide and 10-15 g / t collector to separate zinc and sulfur, yielding zinc sulfide and sulfur. The zinc sulfide is then separated and refined twice, with 400-500 g / t calcium oxide added in the first step and 250-300 g / t calcium oxide added in the second step to obtain zinc sulfide concentrate. The sulfur is then scavenged twice, with 5-10 g / t collector added in the first step and 2-5 g / t collector added in the second step to obtain sulfur concentrate. The middlings from each separation and scavenging are returned to the previous stage.

[0025] The amount of reagent added in the above steps is based on the weight of the dry ore to be treated.

[0026] Compared with the prior art, the present invention has the following advantages and effects:

[0027] This invention deslims middlings from lead and zinc sulfide flotation, resulting in a smaller desliming volume. Furthermore, because the fine mud in the middlings is highly floatable and significantly impacts zinc oxide flotation, selective desliming is achieved, with a desliming yield below 10%. Zinc metal loss due to fine mud loss is also controlled below 10%, greatly reducing zinc metal loss. In contrast, traditional processes often deslim the raw ore or zinc oxide flotation feed, resulting in large feed volumes and indiscriminate desliming of all fine mud in the ore. This lack of selectivity and the large desliming volume lead to a desliming yield generally exceeding 15%, with zinc metal loss also exceeding 15%.

[0028] This invention employs a high-concentration pulp conditioning and low-concentration flotation method for zinc oxide flotation. First, the zinc oxide flotation feed ore slurry is thickened, increasing its concentration to 40-45%. At this concentration, mineral processing reagents are added, which enhances their effectiveness, particularly the effect of sodium sulfide, promoting the action of the zinc oxide collector on the zinc oxide mineral surface. After the reagents have acted at a high concentration, the ore slurry concentration is reduced to 20-25%. This disperses the ore slurry, reduces the adverse effects of fine slime on amine reagent flotation, and lowers the viscosity of the flotation foam from the amine collector. This high-concentration pulp conditioning and low-concentration flotation method improves concentrate grade and recovery rate.

[0029] This invention optimizes the collector for the amine sulfide process by adding a small amount of chelating collector to the amine collector used in the traditional process, thereby improving the recovery rate of difficult-to-select zinc oxide. Attached Figure Description

[0030] Figure 1 This is the process flow diagram of Example 1.

[0031] Figure 2 It is a traditional process. Detailed Implementation

[0032] To make the objectives and technical solutions of this invention clearer, the invention will be further described in detail. Unless otherwise specified, the experimental methods described in the following embodiments are conventional methods; where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions; unless otherwise specified, the reagents and materials are all commercially available.

[0033] Example 1:

[0034] A certain lead-zinc oxide ore contains 1.23% lead and 6.45% zinc, with lead and zinc oxidation rates of 75% and 80%, respectively. Figure 1 The process flow shown is as follows:

[0035] Step 1) First, grind the lead-zinc oxide ore and sodium sulfide in a mill, adding 1000g / t of sodium sulfide; the final fineness of the ore is -0.074mm with 80% of the particles, and the final mass concentration of the flotation slurry is 30% to 35%. Add 800 g / t zinc sulfate, 400 g / t sodium sulfite, 80 g / t butyl ammonium black powder, and 30 g / t frother No. 2 oil to the lead-zinc oxide ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate. Perform two lead scavenging processes on the lead roughing tailings slurry: 20 g / t butyl ammonium black powder is added in the first scavenging, and 10 g / t butyl ammonium black powder is added in the second scavenging to obtain lead tailings. The scavenging concentrate obtained from each lead scavenging is returned to the previous stage. Perform three cleaning processes on the lead rough concentrate: 200 g / t zinc sulfate and 100 g / t sodium sulfite are added in the first cleaning, 100 g / t zinc sulfate and 50 g / t sodium sulfite in the second cleaning, and 50 g / t zinc sulfate and 25 g / t sodium sulfite in the third cleaning to obtain lead concentrate. Deslim the middlings produced in each cleaning process using a hydrocyclone, and the undersand after desliming is sent to the lead scavenging process.

[0036] Step 2) Add 200 g / t of copper sulfate, 80 g / t of butyl xanthate, and 30 g / t of No. 2 oil to the lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform two zinc sulfide scavenging processes on the zinc sulfide rough tailings slurry, adding 20 g / t of butyl xanthate in the first scavenging and 10 g / t of butyl xanthate in the second scavenging to obtain zinc sulfide tailings. The scavenging concentrate obtained from each zinc sulfide scavenging is returned to the previous stage; perform three cleaning processes on the zinc sulfide rough concentrate to obtain cleaned zinc sulfide ore. The middlings produced in each cleaning process are deslimed by a hydrocyclone, and the underflow after desliming is sent to the zinc sulfide scavenging process;

[0037] Zinc sulfide ore is selected and subjected to roughing separation of zinc and sulfur by adding 2000 g / t calcium oxide and 10 g / t butyl xanthate to obtain zinc sulfide and sulfur. Zinc sulfide is then subjected to two separation and cleaning processes: the first process adds 500 g / t calcium oxide, and the second process adds 250 g / t calcium oxide to obtain zinc sulfide concentrate. Sulfur is subjected to two scavenging processes: the first scavenging process adds 5 g / t butyl xanthate, and the second scavenging process adds 2 g / t butyl xanthate to obtain sulfur concentrate. The middlings from each separation and cleaning process and the scavenging process are returned to the previous stage.

[0038] Step 3) First, deslim the zinc sulfide tailings using a hydrocyclone to remove overflow, increasing the concentration of zinc sulfide tailings to 40%. Then, add 3000 g / t sodium carbonate, 300 g / t sodium hexametaphosphate, 8000 g / t sodium sulfide, 100 g / t dodecylamine, and 20 g / t benzohydroxyxamic acid, mix thoroughly, and then dilute with water to reduce the concentration of zinc sulfide tailings to 20%. Perform a first-stage roughing flotation of zinc oxide. Then, add 2000 g / t sodium sulfide and 100 g / t dodecylamine to the tailings for a second-stage roughing process to obtain zinc oxide concentrate and tailings. All reagent dosages in the above steps are based on the weight of the dry ore to be processed.

[0039] Ultimately, we can obtain lead concentrate with a lead grade of 45% and a lead recovery rate of 67%, zinc sulfide concentrate with a zinc grade of 49% and a zinc recovery rate of 15%, and zinc oxide concentrate with a zinc grade of 26% and a zinc recovery rate of 68%.

[0040] Comparative Example 1

[0041] according to Figure 2 The traditional sulfide-amine process shown includes the following steps:

[0042] Step 1) First, grind the lead-zinc oxide ore and sodium sulfide in a mill, adding 1000g / t of sodium sulfide; the final fineness of the ore is -0.074mm with 80% of the particles, and the final mass concentration of the flotation slurry is 30% to 35%. Add 800 g / t zinc sulfate, 400 g / t sodium sulfite, 80 g / t butylammonium black powder, and 30 g / t frother to the lead-zinc oxide ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate. Perform two lead scavenging processes on the lead roughing tailings slurry: 20 g / t butylammonium black powder is added in the first scavenging, and 10 g / t butylammonium black powder is added in the second scavenging to obtain lead tailings. The scavenging concentrate obtained from each lead scavenging is returned to the previous stage. Perform three cleaning processes on the lead rough concentrate: 200 g / t zinc sulfate and 100 g / t sodium sulfite are added in the first cleaning, 100 g / t zinc sulfate and 50 g / t sodium sulfite in the second cleaning, and 50 g / t zinc sulfate and 25 g / t sodium sulfite in the third cleaning to obtain lead concentrate. The middlings produced in each cleaning process are returned to the previous stage.

[0043] Step 2) Add 200 g / t of copper sulfate, 80 g / t of butyl xanthate, and 30 g / t of No. 2 oil to the lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform two zinc sulfide scavenging processes on the zinc sulfide rough tailings slurry, adding 20 g / t of butyl xanthate in the first scavenging and 10 g / t of butyl xanthate in the second scavenging to obtain zinc sulfide tailings. The scavenging concentrate obtained from each zinc sulfide scavenging is returned to the previous stage; perform three cleaning processes on the zinc sulfide rough concentrate to obtain cleaned zinc sulfide ore, with the middlings produced from each cleaning process returned to the previous stage;

[0044] Zinc sulfide ore is selected and subjected to roughing separation of zinc and sulfur by adding 2000 g / t calcium oxide and 10 g / t butyl xanthate to obtain zinc sulfide and sulfur. Zinc sulfide is then subjected to two separation and cleaning processes: the first process adds 500 g / t calcium oxide, and the second process adds 250 g / t calcium oxide to obtain zinc sulfide concentrate. Sulfur is subjected to two scavenging processes: the first scavenging process adds 5 g / t butyl xanthate, and the second scavenging process adds 2 g / t butyl xanthate to obtain sulfur concentrate. The middlings from each separation and cleaning process and the scavenging process are returned to the previous stage.

[0045] Step 3) The zinc sulfide tailings are deslimed using a hydrocyclone to remove overflow, resulting in a zinc sulfide tailings concentration of 30%. Then, 3000 g / t of sodium carbonate, 300 g / t of sodium hexametaphosphate, 8000 g / t of sodium sulfide, and 100 g / t of dodecylamine are added and mixed thoroughly. Water is then added to dilute the mixture, reducing the zinc sulfide tailings concentration to 20%. A primary roughing flotation stage for zinc oxide is then performed. A secondary roughing stage is performed with the addition of 2000 g / t of sodium sulfide and 100 g / t of dodecylamine to obtain zinc oxide concentrate and tailings. All reagent dosages in the above steps are based on the weight of the dry ore to be processed.

[0046] The results showed little change in the indicators of lead concentrate and zinc sulfide concentrate, but the zinc grade of zinc oxide concentrate was 24% and the zinc recovery rate was only 60%, which was a significant decrease.

[0047] Example 2:

[0048] A certain lead-zinc oxide ore contains 0.89% lead and 5.65% zinc, with lead and zinc oxidation rates of 70% and 75%, respectively. The following method is used for processing:

[0049] Step 1) First, grind the lead-zinc oxide ore and sodium sulfide in a mill, adding 800g / t of sodium sulfide; the final fineness of the ore is -0.074mm with 80% of the particles being of this size, and the final mass concentration of the flotation slurry is 30% to 35%. Add 600 g / t zinc sulfate, 300 g / t sodium sulfite, 60 g / t butyl ammonium black powder, and 25 g / t frother No. 2 oil to the lead-zinc oxide ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate. The lead roughing tailings slurry is then subjected to two lead scavenging processes: 15 g / t butyl ammonium black powder is added in the first scavenging, and 5 g / t butyl ammonium black powder is added in the second scavenging, yielding lead tailings. The scavenging concentrate obtained from each lead scavenging is returned to the previous stage. The lead rough concentrate is then subjected to three cleaning processes: 250 g / t zinc sulfate and 150 g / t sodium sulfite are added in the first cleaning, 150 g / t zinc sulfate and 50 g / t sodium sulfite in the second cleaning, and 50 g / t zinc sulfate and 25 g / t sodium sulfite in the third cleaning, yielding lead concentrate. The middlings produced in each cleaning process are deslimed using a hydrocyclone, and the undersand after desliming is sent to the lead scavenging process.

[0050] Step 2) Add 150 g / t of copper sulfate, 60 g / t of butyl xanthate, and 25 g / t of No. 2 oil to the lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform two zinc sulfide scavenging processes on the zinc sulfide rough tailings slurry, adding 20 g / t of butyl xanthate in the first scavenging and 10 g / t of butyl xanthate in the second scavenging to obtain zinc sulfide tailings. The scavenging concentrate obtained from each zinc sulfide scavenging is returned to the previous stage; perform three cleaning processes on the zinc sulfide rough concentrate to obtain cleaned zinc sulfide ore. The middlings produced in each cleaning process are deslimed by a hydrocyclone, and the underflow after desliming is sent to the zinc sulfide scavenging process;

[0051] Zinc sulfide ore is selected and subjected to roughing separation of zinc and sulfur by adding 2500 g / t calcium oxide and 10 g / t butyl xanthate to obtain zinc sulfide and sulfur. Zinc sulfide is then subjected to two separation and cleaning processes: the first process adds 500 g / t calcium oxide, and the second process adds 250 g / t calcium oxide to obtain zinc sulfide concentrate. Sulfur is subjected to two scavenging processes: the first scavenging process adds 5 g / t butyl xanthate, and the second scavenging process adds 2 g / t butyl xanthate to obtain sulfur concentrate. The middlings from each separation and cleaning process and the scavenging process are returned to the previous stage.

[0052] Step 3) First, deslim the zinc sulfide tailings using a hydrocyclone to remove overflow, increasing the zinc sulfide tailings concentration to 40%. Then, add 2500 g / t sodium carbonate, 250 g / t sodium hexametaphosphate, 7000 g / t sodium sulfide, 80 g / t dodecylamine, and 20 g / t benzohydroxyxamic acid, mix thoroughly, and then perform a first-stage roughing flotation of zinc oxide. Next, add 1500 g / t sodium sulfide and 60 g / t dodecylamine to the tailings for a second-stage roughing process to obtain zinc oxide concentrate and tailings. All reagent dosages in the above steps are based on the weight of the dry ore to be processed.

[0053] Ultimately, we can obtain lead concentrate with a lead grade of 43% and a lead recovery rate of 64%, zinc sulfide concentrate with a zinc grade of 49% and a zinc recovery rate of 21%, and zinc oxide concentrate with a zinc grade of 25% and a zinc recovery rate of 61%.

[0054] Comparative Example 2

[0055] according to Figure 2 The traditional amine sulfide process shown includes the following steps:

[0056] Step 1) First, grind the lead-zinc oxide ore and sodium sulfide in a mill, adding 800g / t of sodium sulfide; the final fineness of the ore is -0.074mm with 80% of the particles being of this size, and the final mass concentration of the flotation slurry is 30% to 35%. Add 600 g / t zinc sulfate, 300 g / t sodium sulfite, 60 g / t butyl ammonium black powder, and 25 g / t frother No. 2 oil to the lead-zinc oxide ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate. Perform two lead scavenging processes on the lead roughing tailings slurry: 15 g / t butyl ammonium black powder is added in the first scavenging, and 5 g / t butyl ammonium black powder is added in the second scavenging to obtain lead tailings. The scavenging concentrate obtained from each lead scavenging is returned to the previous stage. Perform three cleaning processes on the lead rough concentrate: 250 g / t zinc sulfate and 150 g / t sodium sulfite are added in the first cleaning, 150 g / t zinc sulfate and 50 g / t sodium sulfite are added in the second cleaning, and 50 g / t zinc sulfate and 25 g / t sodium sulfite are added in the third cleaning to obtain lead concentrate. The middlings produced in each cleaning process are returned to the previous stage.

[0057] Step 2) Add 150 g / t of copper sulfate, 60 g / t of butyl xanthate, and 25 g / t of No. 2 oil to the lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform two zinc sulfide scavenging processes on the zinc sulfide rough tailings slurry, adding 20 g / t of butyl xanthate in the first scavenging and 10 g / t of butyl xanthate in the second scavenging to obtain zinc sulfide tailings. The scavenging concentrate obtained from each zinc sulfide scavenging is returned to the previous stage; perform three cleaning processes on the zinc sulfide rough concentrate to obtain cleaned zinc sulfide ore, with the middlings produced from each cleaning process returned to the previous stage;

[0058] Zinc sulfide ore is selected and subjected to roughing separation of zinc and sulfur by adding 2500 g / t calcium oxide and 10 g / t butyl xanthate to obtain zinc sulfide and sulfur. Zinc sulfide is then subjected to two separation and cleaning processes: the first process adds 500 g / t calcium oxide, and the second process adds 250 g / t calcium oxide to obtain zinc sulfide concentrate. Sulfur is subjected to two scavenging processes: the first scavenging process adds 5 g / t butyl xanthate, and the second scavenging process adds 2 g / t butyl xanthate to obtain sulfur concentrate. The middlings from each separation and cleaning process and the scavenging process are returned to the previous stage.

[0059] Step 3) The zinc sulfide tailings are deslimed using a hydrocyclone to remove overflow, resulting in a zinc sulfide tailings concentration of 30%. Then, 2500 g / t of sodium carbonate, 250 g / t of sodium hexametaphosphate, 7000 g / t of sodium sulfide, and 80 g / t of dodecylamine are added and mixed thoroughly. This mixture is then subjected to a first-stage roughing flotation of zinc oxide. A second-stage roughing flotation is performed on the tailings with an additional 2000 g / t of sodium sulfide and 100 g / t of dodecylamine to obtain zinc oxide concentrate and tailings. All reagent dosages in the above steps are based on the weight of the dry ore to be processed.

[0060] The results showed little change in the indicators of lead concentrate and zinc sulfide concentrate, but the zinc grade of zinc oxide concentrate was 23% and the zinc recovery rate was only 55%, which was a significant decrease.

[0061] Example 3

[0062] Compared to Example 2, the lead flotation and zinc sulfide flotation processes were the same, but in step three), the zinc oxide flotation did not involve high-concentration slurry conditioning or low-concentration flotation. Instead, the zinc sulfide tailings were directly deslimed in a hydrocyclone to remove overflow, resulting in a zinc sulfide tailings concentration of 30% for flotation. All other steps remained the same. The resulting zinc oxide concentrate had a zinc grade of 25% and a recovery rate of 59%.

[0063] Comparative Example 3

[0064] Compared to Example 2, all other steps were the same, except that benzohydroxyxamic acid was not added for flotation in step three. The results showed that the zinc oxide concentrate had a zinc grade of 24% and a recovery rate of 59%.

[0065] Furthermore, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for separating oxidized lead-zinc ore, characterized in that, Includes the following steps: Step 1) Add zinc sulfide inhibitor, lead collector and frother to lead-zinc oxide ore slurry for flotation to obtain lead roughing tailings slurry and lead rough concentrate; perform multiple lead scavenging on the lead roughing tailings slurry to obtain lead tailings, and return the scavenging concentrate obtained from each lead scavenging to the previous stage; perform multiple fine cleaning on the lead rough concentrate to obtain lead concentrate, and deslim the middlings produced from each fine cleaning is performed by hydrocyclone desliming, and the undersludge after desliming of the middlings is sent to lead scavenging; Step 2) Add zinc sulfide activator, zinc sulfide collector and frother to lead tailings for flotation to obtain zinc sulfide rough concentrate and zinc sulfide rough tailings slurry; perform multiple zinc sulfide scavenging on the zinc sulfide rough tailings slurry to obtain zinc sulfide tailings, and return the scavenged concentrate obtained from each zinc sulfide scavenging to the previous stage; perform multiple fine cleaning on the zinc sulfide rough concentrate to obtain fine zinc sulfide ore, and deslim the middlings produced from each fine cleaning is performed by hydrocyclone, and the undersludge after desliming of the middlings is sent to zinc sulfide scavenging; Step 3) Perform zinc oxide flotation on the zinc sulfide tailings to obtain zinc oxide concentrate and tailings.

2. The method for separating oxidized lead-zinc ore according to claim 1, characterized in that, The zinc sulfide inhibitor uses zinc sulfate and sodium sulfite, with the ratio of zinc sulfate to sodium sulfite being 1:0.5~1.

3. The method for separating lead-zinc oxide ore according to claim 1, characterized in that, The lead collector is at least one of No. 25 black powder, butylammonium black powder, and isobutyl sodium black powder.

4. The method for separating oxidized lead-zinc ore according to claim 1, characterized in that, In step one), the lead concentrate is cleaned three times, with zinc sulfide inhibitor added during each cleaning process; In step one), the lead concentrate is subjected to a second lead scavenging process, and a lead collector is added during each lead scavenging process.

5. The method for separating oxidized lead-zinc ore according to claim 1, characterized in that, The zinc sulfide collector is at least one of butyl xanthate, pentyle xanthate, isobutyl xanthate, and isoamyl xanthate; the zinc sulfide activator is copper sulfate.

6. The method for separating lead-zinc oxide ore according to claim 1, characterized in that, In step three, the zinc sulfide tailings are first deslimed using a hydrocyclone to remove overflow, increasing the concentration of zinc sulfide tailings to 40-45%. Then, slurry conditioner, zinc oxide activator, and zinc oxide collector are added, mixed evenly, and then diluted with water to reduce the concentration of zinc sulfide tailings to 15-25% before flotation.

7. The method for separating lead-zinc oxide ore according to claim 1, characterized in that, In step two), pyrite inhibitors and zinc sulfide collectors are added to the refined zinc sulfide ore to carry out zinc-sulfur separation flotation, resulting in zinc sulfide concentrate and sulfur concentrate.

8. The method for separating lead-zinc oxide ore according to claim 6, characterized in that, The zinc oxide collector is composed of an amine cationic collector and a chelating collector in a ratio of 10~20:

1. The amine cation collector is at least one of dodecylamine, octadecylamine, and mixed amines, and the chelating collector is at least one of benzohydroxyoxime acid, salicylic acid, and octylhydroxyoxime acid.

9. The method for separating oxidized lead-zinc ore according to claim 1, characterized in that, The foaming agent is one or more of No. 2 oil, MIBC, and polyethylene glycol methyl ether.

10. The method for separating lead-zinc oxide ore according to claim 1, characterized in that, The lead-zinc oxide ore slurry is prepared by grinding the lead-zinc oxide ore and sodium sulfide in a mill, with the sodium sulfide addition amount being 500~1500g / t; the final fineness of the ore is -0.074mm particle size accounting for 75%~85%, and the final mass concentration of the slurry fed into the flotation is 30%~35%.

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