CN115228615A - Lead-zinc oxide ore separation method - Google Patents

Lead-zinc oxide ore separation method Download PDF

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Publication number
CN115228615A
CN115228615A CN202210945010.7A CN202210945010A CN115228615A CN 115228615 A CN115228615 A CN 115228615A CN 202210945010 A CN202210945010 A CN 202210945010A CN 115228615 A CN115228615 A CN 115228615A
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ore
zinc oxide
lead
flotation
oxide
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刘志国
于传兵
宋磊
康金星
邓朝安
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores

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Abstract

The invention provides a lead-zinc oxide ore separation method, which comprises the following steps: grinding lead-zinc oxide ores to be sorted to obtain floating ore pulp; sequentially carrying out sulphide ore flotation treatment, lead oxide flotation treatment and zinc oxide flotation treatment on the ore pulp entering the flotation process; and mixing the obtained first middling to be floated, second middling to be floated and third middling to be floated, adding sodium sulfide and a zinc oxide collector to perform fine-grained zinc oxide flotation, and recovering fine-grained zinc oxide. The invention can solve the problem that the desliming link of the desliming-flotation process adopted at present causes zinc oxide loss and influences the overall recovery rate; and the desliming effect has large fluctuation, which leads to the problem that the stable production can not be realized.

Description

Lead-zinc oxide ore separation method
Technical Field
The invention relates to the technical field of mineral processing, in particular to a lead-zinc oxide ore separation method.
Background
The mineral composition of the lead-zinc oxide ore containing the mud is complex, the content of fine mud and soluble salt is high, and the ore is extremely difficult to select, so that the conventional flotation process index of the lead-zinc oxide ore is not ideal at present. Currently, the most common beneficiation process for treating mud-containing lead-zinc oxide ores is a desliming-flotation process. However, the desliming ring section of the process can cause the loss of zinc oxide, and the selection index has larger fluctuation along with the desliming effect, so that the stable production can not be generally realized on site. In order to obtain a better beneficiation effect, in recent years, beneficiation workers try various beneficiation methods such as flocculation flotation, carrier flotation, flotation using a chelate collector, sulfidizing roasting-flotation, multi-method combination, and the like. However, no breakthrough progress is made in the processes, and the flotation of the complex lead-zinc oxide ore is always a difficult problem in the ore dressing industry.
The prior art is, for example, the patent numbers: CN100391616C discloses a beneficiation method for zinc oxide ore, which carries out fine flotation on lead flotation tailings and then enters coarse flotation, and the technology aims at the floating characteristic that argillaceous zinc oxide floats small particles first and then large particles, solves the problem that the argillaceous zinc oxide is difficult to float in the prior art, can float useful zinc minerals from the argillaceous zinc oxide ore, also improves the recovery rate of zinc oxide, and reduces the content of zinc oxide in the tailings. However, the process requires the use of a large amount of fine-grained gangue mineral inhibitor, the dosage system is complicated, and the process also requires desliming, resulting in the loss of part of the zinc mineral.
As another example, the patent numbers are: CN 103182344B discloses a mineral separation combined process for treating high-mud lead-zinc-oxygen-sulfur mixed ore, which comprises screening and desliming before grinding, reselecting coarse fraction in the ground product, combining gravity tailings and desilting sand of cyclone, grinding, then performing flotation, and performing flotation on the deslimed slime. The process adopts a mode of combining gravity separation and flotation to treat the lead-zinc oxide ores in a grading manner. However, the process also has a desliming link, namely desliming flotation, and although the slime flotation link exists, the recovery rate of fine-fraction slime flotation is relatively low, so that the overall recovery rate is influenced.
In summary, the most common beneficiation process for treating mud-containing lead-zinc oxide ores is the desliming-flotation process. However, the desliming ring section of the process can cause zinc oxide loss, and the selection index has larger fluctuation along with the desliming effect, so that the problem that the stable production can not be generally carried out on site exists.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for sorting lead-zinc oxide ores, so as to solve the problem that the desliming link of the desliming-flotation process adopted at present causes zinc oxide loss and affects the overall recovery rate; and the desliming effect has large fluctuation, which leads to the problem that the stable production can not be realized.
The invention provides a lead-zinc oxide ore separation method, which comprises the following steps:
grinding lead-zinc oxide ores to be sorted to obtain floating ore pulp;
carrying out sulphide ore flotation treatment on the entering flotation pulp; the sulfide ore flotation treatment comprises the following steps: carrying out sulfide ore roughing on the in-flotation ore pulp to obtain lead-zinc sulfide rough ore and first ore pulp, and carrying out sulfide ore fine selection on the lead-zinc sulfide rough ore to obtain lead-zinc sulfide concentrate and first middling; performing first fine scavenging on the first middlings, returning the first middlings on the upper part obtained by the first fine scavenging to the sulfide ore rough concentration, and taking the first middlings on the lower part obtained by the first fine scavenging as first middlings to be floated;
carrying out lead oxide flotation treatment on the first ore pulp; the lead oxide flotation treatment comprises the following steps: performing lead oxide roughing on the first ore pulp to obtain lead oxide rough ore and second ore pulp; carrying out lead oxide concentration on the lead oxide rough ore to obtain lead oxide concentrate and a second middling; performing second fine scavenging on the second middlings, returning the second middlings on the upper part obtained by the second fine scavenging to the lead oxide roughing, and taking the second middlings on the lower part obtained by the second fine scavenging as second middlings to be floated;
performing zinc oxide flotation treatment on the second ore pulp; the zinc oxide flotation treatment comprises; performing zinc oxide roughing on the second ore pulp to obtain zinc oxide rough ores and tailings; performing zinc oxide concentration on the zinc oxide coarse ore to obtain zinc oxide concentrate and a third middling; performing third fine scavenging on the third middlings, returning the third middlings on the upper part obtained by the third fine scavenging to the zinc oxide roughing, and taking the third middlings on the lower part obtained by the third fine scavenging as third middlings to be floated;
after the first middling to be floated, the second middling to be floated and the third middling to be floated are mixed, adding sodium sulfide and a zinc oxide collector to perform fine-grained zinc oxide flotation, and recovering fine-grained zinc oxide; wherein during the fine-grained zinc oxide flotation, the flotation concentration is below 15%.
In addition, the preferable scheme is that the mass concentration of the flotation pulp is 20-25%.
In addition, the concentration of the rough concentration of the sulfide ore is preferably 20 to 25 percent; and/or the presence of a gas in the gas,
the concentration of the lead oxide roughing is 20 to 25 percent; and/or the presence of a gas in the atmosphere,
the concentration of the zinc oxide roughing is 15-20%.
In addition, it is preferable that, in the process of carrying out the sulphide ore flotation treatment on the entering flotation pulp,
carrying out sulphide ore flotation on the entering flotation pulp by adopting a mode of two-section sulphide ore rough concentration, two-section sulphide ore fine concentration and one-section first fine scavenging; wherein, the first and the second end of the pipe are connected with each other,
adding a sulphide ore collecting agent and a first foaming agent during the first-stage sulphide ore rough separation; during the second-stage sulfide ore rough concentration, firstly adding copper sulfate to activate zinc sulfide, and then adding the sulfide ore collecting agent and the foaming agent; adding the sulfide ore collector during the first fine scavenging; and/or, in the process of carrying out the sulfide ore flotation treatment on the flotation pulp, the sulfide ore collecting agent and the first foaming agent are both applied with saturated chemicals.
In addition, the preferable scheme is that the sulfide ore collecting agent is one of or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 black powder, butyl ammonium black powder and isobutyl sodium black powder which are mixed according to any proportion; and/or the first foaming agent is one of No. 2 oil, MIBC, alcohols and ether alcohols or at least two of the two mixed according to any proportion.
In addition, preferably, during the lead oxide flotation treatment of the first ore pulp,
performing lead oxide flotation on the first ore pulp by adopting a two-section lead oxide roughing, two-section lead oxide concentrating and one-section second fine scavenging mode; wherein the content of the first and second substances,
during the two-stage lead oxide roughing, firstly adding sodium sulfide to activate lead oxide, and then adding a lead oxide collecting agent and a second foaming agent; adding the lead oxide collector during the second fine scavenging; and/or the presence of a gas in the gas,
and in the process of carrying out lead oxide flotation treatment on the first ore pulp, saturated chemicals are used for both the lead oxide collecting agent and the second foaming agent.
In addition, the preferred scheme is that the lead oxide collecting agent is one of or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 black powder, butyl ammonium black powder and isobutyl sodium black powder which are mixed according to any proportion; and/or the second foaming agent is one of No. 2 oil, MIBC, alcohols, ether alcohols or at least two of the two mixed according to any proportion.
In addition, preferably, during the zinc oxide flotation treatment of the second ore pulp,
performing zinc oxide flotation on the second ore pulp by adopting a mode of two-section zinc oxide roughing, two-section zinc oxide concentrating and one-section third fine scavenging; wherein the content of the first and second substances,
during two-stage zinc oxide roughing, sodium sulfide is added to activate zinc oxide, and then a zinc oxide collector and a third foaming agent are added; during the third fine scavenging, adding sodium sulfide and the zinc oxide collector; and/or the presence of a gas in the gas,
and in the process of carrying out zinc oxide flotation treatment on the second ore pulp, saturated chemicals are adopted for the zinc oxide collecting agent and the third foaming agent.
In addition, preferably, the zinc oxide collector is a fatty amine or ether amine collector or a mixed collector of the fatty amine and the ether amine collector according to any proportion; and/or the third foaming agent is one of No. 2 oil, MIBC, alcohols, ether alcohols or at least two of the substances mixed according to any proportion.
In addition, the preferable scheme is that the final fineness of the lead-zinc oxide ore after ore grinding is-0.074 mm, and the fraction accounts for 75-90%.
According to the technical scheme, the lead-zinc oxide ore separation method provided by the invention has the advantages that the flotation of sulfide ore, the flotation of lead oxide and the flotation of zinc oxide are sequentially carried out on the pulp entering the flotation process, and the flotation of fine-grain zinc oxide is carried out after the first middling, the second middling and the third middling generated in the flotation process are concentrated, so that no slime regulator or inhibitor is required to be added in the whole process, no desliming, no mud control and full-grain grade flotation are carried out, the adverse effect of the slime regulator or inhibitor on the flotation of zinc oxide is avoided, and the flotation recovery rate of lead-zinc oxide ore is improved; the middlings containing the fine mud are treated in a centralized manner, the fine mud is led out from the main flow in time, and the fine mud is prevented from being accumulated in a circulating manner in the main flow; the saturated chemical in the flotation process of the sulfide ore and the lead oxide can enable useful minerals and partial fine mud to float upwards as much as possible, so that the fine mud floats upwards along with each section of operation while the recovery rate of the minerals is improved, and the influence of the fine mud on the subsequent zinc oxide flotation is reduced; the main flow and the middling centralized treatment both adopt flotation with specific concentration, the influence of fine mud on the flotation of zinc oxide minerals is reduced, the recovery rate of fine zinc oxide is improved, and other processes are not required to be introduced by adopting the flotation in the whole process.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow diagram of a lead zinc oxide ore separation method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a lead-zinc oxide ore separation method according to an embodiment of the invention.
In the drawings, the same reference numerals indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that the desliming link of the desliming-flotation process adopted at present causes zinc oxide loss and influences the overall recovery rate; and the problem that stable production cannot be realized due to large desliming effect fluctuation, and the like, provides a lead-zinc oxide ore separation method and a device.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the lead-zinc oxide ore separation method provided by the present invention, fig. 1 shows a flow of the lead-zinc oxide ore separation method according to an embodiment of the present invention; fig. 2 shows a specific flow of the lead-zinc oxide ore sorting method according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, the lead-zinc oxide ore separation method provided by the invention comprises the following steps:
s1, grinding lead-zinc oxide ores to be sorted to obtain ore flotation pulp.
And (3) putting lead-zinc oxide ores to be separated into ore grinding equipment for ore grinding to obtain ore floatation pulp.
In a preferable scheme of the invention, the mass concentration of the pulp entering the flotation is 20-25%.
As a preferable scheme of the invention, the lead-zinc oxide ore with the final fineness of-0.074 mm after ore grinding accounts for 75-90 percent. Wherein, the lead-zinc oxide ore with the final fineness of-0.074 mm accounts for 75-90% of the total ore grains after being ground, which means that the lead-zinc oxide ore with the grain size of below 0.074mm accounts for 75-90% of the total ore grains after being ground.
S2, sulfide ore flotation treatment is carried out on the entering flotation pulp; the sulfide ore flotation treatment comprises the following steps: carrying out sulfide ore roughing on the entering flotation pulp to obtain lead-zinc sulfide rough ores and first pulp, and carrying out sulfide ore fine selection on the lead-zinc sulfide rough ores to obtain lead-zinc sulfide concentrate and first middlings; and carrying out first fine scavenging on the first middling, returning the first middling on the upper part obtained by the first fine scavenging to the sulfide ore rough separation, and taking the first middling on the lower part obtained by the first fine scavenging as the first middling to be floated.
In a preferred embodiment of the present invention, the concentration of the roughly selected sulfide ore is 20% to 25%.
In a preferable scheme of the invention, in the process of carrying out the sulphide ore flotation treatment on the entering flotation pulp,
carrying out sulphide ore flotation on the entering flotation pulp by adopting a mode of two-section sulphide ore rough concentration, two-section sulphide ore fine concentration and one-section first fine scavenging; wherein, the first and the second end of the pipe are connected with each other,
adding a sulfide ore collecting agent and a first foaming agent during the first-stage sulfide ore roughing; when the second-stage sulfide ore is roughly selected, copper sulfate is added to activate zinc sulfide, and then a sulfide ore collecting agent and a foaming agent are added; adding a sulfide ore collecting agent during the first fine scavenging; and/or the presence of a gas in the gas,
in the process of carrying out sulphide ore flotation treatment on the entering flotation pulp, saturated chemicals are used as the sulphide ore collecting agent and the first foaming agent.
Saturated medication means that the dosage of the medicament floats upwards by 10 to 20 percent under the optimal dosage of the medicament. The saturated chemical can float useful minerals and part of fine mud as far as possible, so that the fine mud floats with each section of operation while the recovery rate of the minerals is improved, and the influence of the fine mud on the subsequent zinc oxide flotation is reduced.
As a preferable scheme of the invention, the sulfide ore collecting agent is one of or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 nigre, butyl ammonium nigre and isobutyl sodium nigre which are mixed according to any proportion;
and/or the first foaming agent is one of No. 2 oil, MIBC, alcohols and ether alcohols or at least two of the two mixed according to any proportion.
S3, carrying out lead oxide flotation treatment on the first ore pulp; the lead oxide flotation treatment comprises the following steps: performing lead oxide roughing on the first ore pulp to obtain lead oxide rough ore and second ore pulp; carrying out lead oxide concentration on the lead oxide rough ore to obtain lead oxide concentrate and a second middling; and performing second fine scavenging on the second middlings, returning the second middlings on the upper part obtained by the second fine scavenging to lead oxide roughing, and taking the second middlings on the lower part obtained by the second fine scavenging as second middlings to be floated.
In a preferred embodiment of the present invention, the lead oxide concentration in the roughing step is 20% to 25%.
In a preferable scheme of the invention, during the lead oxide flotation treatment of the first ore pulp,
performing lead oxide flotation on the first ore pulp by adopting a mode of two-section lead oxide roughing, two-section lead oxide concentrating and one-section second fine scavenging; wherein, the first and the second end of the pipe are connected with each other,
during the two-stage lead oxide roughing, firstly adding sodium sulfide to activate lead oxide, and then adding a lead oxide collecting agent and a second foaming agent; adding a lead oxide collecting agent during second fine scavenging; and/or the presence of a gas in the gas,
in the process of carrying out lead oxide flotation treatment on the first ore pulp, saturated chemicals are used for both the lead oxide collecting agent and the second foaming agent. The saturated medication refers to that the dosage of the medicament floats upwards by 10 to 20 percent under the optimal dosage of the medicament. The saturated chemical can float useful minerals and part of fine mud as far as possible, so that the fine mud floats with each section of operation while the recovery rate of the minerals is improved, and the influence of the fine mud on the subsequent zinc oxide flotation is reduced.
As a preferred scheme of the invention, the lead oxide collecting agent is one of or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 black powder, butyl ammonium black powder and isobutyl sodium black powder which are mixed according to any proportion;
and/or the second foaming agent is one of No. 2 oil, MIBC, alcohols and ether alcohols or at least two of the two mixed according to any proportion.
S4, performing zinc oxide flotation treatment on the second ore pulp; the zinc oxide flotation treatment comprises the following steps; performing zinc oxide roughing on the second ore pulp to obtain zinc oxide rough ores and tailings; performing zinc oxide concentration on the zinc oxide rough ore to obtain zinc oxide concentrate and a third middling; and performing third fine scavenging on the third middling, returning the third middling on the upper part obtained by the third fine scavenging to the zinc oxide roughing, and taking the third middling on the lower part obtained by the third fine scavenging as the third middling to be floated.
In a preferred embodiment of the present invention, the concentration of the zinc oxide is 15% to 20%.
In a preferable scheme of the invention, in the process of carrying out the zinc oxide flotation treatment on the second ore pulp,
zinc oxide flotation is carried out on the second ore pulp by adopting a mode of two-section zinc oxide roughing, two-section zinc oxide concentrating and one-section third fine scavenging; wherein, the first and the second end of the pipe are connected with each other,
during two-stage zinc oxide roughing, firstly adding sodium sulfide to activate zinc oxide, and then adding a zinc oxide collector and a third foaming agent; during the third fine scavenging, adding a sodium sulfide and zinc oxide collector; and/or the presence of a gas in the gas,
in the process of carrying out zinc oxide flotation treatment on the second ore pulp, saturated chemicals are adopted for the zinc oxide collecting agent and the third foaming agent. The saturated chemical can float useful minerals and part of fine mud as far as possible, so that the fine mud floats with each section of operation while the recovery rate of the minerals is improved, and the influence of the fine mud on the subsequent zinc oxide flotation is reduced.
As a preferable scheme of the invention, the zinc oxide collector is a fatty amine or ether amine collector or a mixed collector of the fatty amine and the ether amine collector according to any proportion; such as dodecylamine, octadecylamine; and/or the presence of a gas in the gas,
the third foaming agent is one or at least two of No. 2 oil, MIBC, alcohol substances and ether alcohol substances which are mixed according to any proportion.
S5, after the first middling to be floated, the second middling to be floated and the third middling to be floated are mixed, adding sodium sulfide and a zinc oxide collector to perform fine zinc oxide flotation, and recovering fine zinc oxide; wherein during the fine-grained zinc oxide flotation, the flotation concentration is below 15%.
In a preferable scheme of the invention, the flotation concentration is 10-15% in the fine zinc oxide flotation process.
After the selected middlings of the sulfide ores, the lead oxides and the zinc oxides are subjected to fine scavenging, all obtained tailings are treated in a centralized manner, sodium sulfide is added to activate the zinc oxide, and a zinc oxide collector is added to recover fine-grained zinc oxide, so that the loss of the zinc oxide is reduced.
The flotation concentration of the main flow and the flotation concentration of the middlings in centralized treatment are beneficial to the dispersion of slime and the flotation of oxidized ore minerals, and the flotation flow is combined, so that no slime inhibitor or pulp regulator is added in the whole flotation flow, the whole flow is not desliming and not mud-controlled flotation is realized, the inhibition of the slime inhibitor on zinc oxide minerals is avoided, the adverse effect of fine slime on the zinc oxide flotation is overcome, and the recovery rate of zinc oxide is ensured.
The following examples are presented to further illustrate the present invention so that those skilled in the art may better understand the advantages and features of the present invention.
Example 1:
the lead-zinc oxide ore contains 3.72% of lead and 7.31% of zinc, and the oxidation rates of lead and zinc are respectively 72% and 75%. The ore with the final fineness of-0.074 mm accounts for 85 percent, and the mass concentration of the ore entering the flotation pulp is 25 percent finally.
The flotation concentration of the rough concentration of the sulfide ore is 25 percent, the collecting agents are butyl xanthate and butyl ammonium black powder, and the foaming agent is No. 2 oil. The total using amount of the collecting agent in the rough separation section floats up by 20 to 150g/t Raw ore The total amount of foaming agent floats upwards by 20 to 90g/t Raw ore The total dosage of the collecting agent for fine scavenging is 10g/t Raw ore ；
The lead oxide roughing flotation concentration is 25%, the fine scavenging concentration is 15%, the collecting agents are butyl xanthate and butyl ammonium black, and the foaming agent is No. 2 oil. The total dosage of the sodium sulfide in the rough selection section is 1000g/t Raw ore The total using amount of the collecting agent floats upwards by 20 to 150g/t Raw ore The total amount of foaming agent floats up to 20-90 g/t Raw ore The total consumption of the collecting agent for fine scavenging is 10g/t Raw ore ；
The concentration of the zinc oxide in the rough flotation is 20%, the concentration of the fine scavenging is 10%, and the collecting agent is dodecylamine. The total dosage of sodium sulfide in the rough separation section is 4000g/t Raw ore The total dosage of the collecting agent is 120g/t Raw ore The total consumption of the collecting agent for fine scavenging is 15g/t Raw ore 。
The middlings are intensively treated, the flotation concentration is 10 percent, and the dosage of sodium sulfide is 2000g/t Raw ore The dosage of the laurylamine is 60g/t Raw ore 。
By the method, the lead grade of the total bulk concentrate is 10.47%, the lead recovery rate is 85.78%, the zinc grade is 20.89%, and the zinc recovery rate is 85.78%.
Example 2:
the lead-zinc oxide ore contains 2.63% of lead and 5.58% of zinc, and the oxidation rates of lead and zinc are respectively 72% and 74%. By the same method as in example 1, the lead grade of the total bulk concentrate was 8.57%, the lead recovery was 85.15%, the zinc grade was 18.85%, and the zinc recovery was 84.52%.
Example 3:
the lead-zinc oxide ore contains 4.24% of lead and 9.41% of zinc, and the oxidation rates of lead and zinc are respectively 62% and 71%. By the same method as in example 1, the lead grade of the total bulk concentrate was 11.67%, the lead recovery rate was 86.89%, the zinc grade was 25.45%, and the zinc recovery rate was 85.78% could be obtained.
Comparative example 1:
compared with the embodiment 1, the flotation concentration of each operation in the main flow is 35%, the lead grade of the total bulk concentrate is 10.01%, the lead recovery rate is 84.61%, the zinc grade is 20.14%, and the zinc recovery rate is 82.43%.
Comparative example 2:
compared with the embodiment 1, all middlings are returned to the roughing operation without being subjected to the fine scavenging operation, and the slime regulator sodium hexametaphosphate 100g/t and the water glass 2000g/t are added in the zinc flotation process, so that the lead grade of the total bulk concentrate is 10.12%, the lead recovery rate is 84.53%, the zinc grade is 20.05%, and the zinc recovery rate is 81.81%.
According to the method for separating the lead-zinc oxide ores, sulfide ore flotation, lead oxide flotation and zinc oxide flotation are sequentially carried out on entering flotation pulp, and fine-grain zinc oxide flotation is carried out after first middlings, second middlings and third middlings generated in the flotation process are concentrated, so that no slime regulator or inhibitor is required to be added in the whole process, desliming, mud control and whole-grain-level entering flotation are avoided, and the lead-zinc oxide ore flotation recovery rate is improved; the middlings containing the fine mud are treated in a centralized manner, the fine mud is led out from the main flow in time, and the fine mud is prevented from being accumulated in a circulating manner in the main flow; the main flow and the middling centralized treatment both adopt flotation with specific concentration, the influence of fine mud on the flotation of zinc oxide minerals is reduced, the recovery rate of fine zinc oxide is improved, and other processes are not required to be introduced by adopting the flotation in the whole process.
The lead-zinc oxide ore sorting method proposed according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the lead-zinc oxide ore separation process set forth above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.

Claims (10)

1. The lead-zinc oxide ore separation method is characterized by comprising the following steps:
grinding lead-zinc oxide ores to be sorted to obtain floating ore pulp;
carrying out sulphide ore flotation treatment on the flotation pulp; the sulfide ore flotation treatment comprises the following steps: carrying out sulphide ore roughing on the in-flotation pulp to obtain lead zinc sulphide rough ore and first pulp, and carrying out sulphide ore beneficiation on the lead zinc sulphide rough ore to obtain lead zinc sulphide concentrate and first middling; performing first fine scavenging on the first middlings, returning the first middlings on the upper part obtained by the first fine scavenging to the sulfide ore rough concentration, and taking the first middlings on the lower part obtained by the first fine scavenging as first middlings to be floated;
carrying out lead oxide flotation treatment on the first ore pulp; the lead oxide flotation treatment comprises the following steps: performing lead oxide roughing on the first ore pulp to obtain lead oxide rough ore and second ore pulp; carrying out lead oxide concentration on the lead oxide rough ore to obtain lead oxide concentrate and a second middling; performing second fine scavenging on the second middlings, returning the second middlings on the upper part obtained by the second fine scavenging to the lead oxide roughing, and taking the second middlings on the lower part obtained by the second fine scavenging as second middlings to be floated;
performing zinc oxide flotation treatment on the second ore pulp; the zinc oxide flotation treatment comprises; performing zinc oxide roughing on the second ore pulp to obtain zinc oxide rough ores and tailings; performing zinc oxide concentration on the zinc oxide rough ore to obtain zinc oxide concentrate and a third middling; performing third fine scavenging on the third middlings, returning the third middlings on the upper part obtained by the third fine scavenging to the zinc oxide roughing, and taking the third middlings on the lower part obtained by the third fine scavenging as third middlings to be floated;
after mixing the first middling to be floated, the second middling to be floated and the third middling to be floated, adding sodium sulfide and a zinc oxide collecting agent to perform fine zinc oxide flotation, and recovering fine zinc oxide; wherein during the fine-grained zinc oxide flotation, the flotation concentration is below 15%.
2. The lead-zinc oxide ore sorting method according to claim 1,
the mass concentration of the floating ore pulp is 20-25%; and/or the presence of a gas in the gas,
in the fine-grained zinc oxide flotation process, the flotation concentration is 10-15%.
3. The lead-zinc oxide ore sorting method according to claim 1,
the concentration of the sulfide ore rough concentration is 20-25%; and/or the presence of a gas in the gas,
the concentration of the lead oxide roughing is 20 to 25 percent; and/or the presence of a gas in the gas,
the concentration of the zinc oxide roughing is 15-20%.
4. The lead-zinc oxide ore separation method according to claim 1, wherein, in the process of carrying out the sulfide ore flotation treatment on the flotation pulp,
carrying out sulphide ore flotation on the entering flotation pulp by adopting a mode of two-section sulphide ore rough concentration, two-section sulphide ore fine concentration and one-section first fine scavenging; wherein the content of the first and second substances,
adding a sulfide ore collecting agent and a first foaming agent during the first-stage sulfide ore roughing; when the second-stage sulfide ore is roughly selected, copper sulfate is added to activate zinc sulfide, and then the sulfide ore collecting agent and the foaming agent are added; adding the sulfide ore collector during the first fine scavenging; and/or the presence of a gas in the atmosphere,
and in the process of carrying out sulfide ore flotation treatment on the flotation pulp, the sulfide ore collecting agent and the first foaming agent are both applied with saturated chemicals.
5. The lead-zinc oxide ore sorting method according to claim 4,
the sulfide ore collecting agent is one or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 black powder, butyl ammonium black powder and isobutyl sodium black powder which are mixed according to any proportion;
and/or the first foaming agent is one of No. 2 oil, MIBC, alcohols and ether alcohols or at least two of the two mixed according to any proportion.
6. The lead-zinc oxide ore separation method according to claim 1, characterized in that, during the lead oxide flotation treatment of the first ore pulp,
performing lead oxide flotation on the first ore pulp by adopting a two-section lead oxide roughing, two-section lead oxide concentrating and one-section second fine scavenging mode; wherein the content of the first and second substances,
during the two-stage lead oxide roughing, sodium sulfide is added to activate lead oxide, and then a lead oxide collecting agent and a second foaming agent are added; adding the lead oxide collector during the second fine scavenging; and/or the presence of a gas in the gas,
and in the process of carrying out lead oxide flotation treatment on the first ore pulp, saturated chemicals are used for both the lead oxide collecting agent and the second foaming agent.
7. The lead-zinc oxide ore sorting method according to claim 6,
the lead oxide collecting agent is one or at least two of butyl xanthate, amyl xanthate, isobutyl xanthate, isoamyl xanthate, no. 25 black powder, butyl ammonium black powder and isobutyl sodium black powder which are mixed according to any proportion;
and/or the second foaming agent is one of No. 2 oil, MIBC, alcohols, ether alcohols or at least two of the two mixed according to any proportion.
8. The lead-zinc oxide ore separation method according to claim 1, characterized in that, in the process of subjecting the second ore pulp to zinc oxide flotation treatment,
performing zinc oxide flotation on the second ore pulp by adopting a mode of two-section zinc oxide roughing, two-section zinc oxide concentrating and one-section third fine scavenging; wherein the content of the first and second substances,
during two-stage zinc oxide roughing, sodium sulfide is added to activate zinc oxide, and then a zinc oxide collector and a third foaming agent are added; during the third fine scavenging, adding sodium sulfide and the zinc oxide collector; and/or the presence of a gas in the atmosphere,
and in the process of carrying out zinc oxide flotation treatment on the second ore pulp, saturated chemicals are adopted for the zinc oxide collecting agent and the third foaming agent.
9. The lead-zinc oxide ore sorting method according to claim 8,
the zinc oxide collector is a fatty amine or ether amine collector or a mixed collector of the fatty amine and the ether amine collector in any proportion; and/or the presence of a gas in the gas,
the third foaming agent is one or at least two of No. 2 oil, MIBC, alcohol substances and ether alcohol substances which are mixed according to any proportion.
10. The lead-zinc oxide ore sorting method according to claim 1,
the lead-zinc oxide ore after grinding has a final fineness of-0.074 mm and the fraction accounts for 75-90%.
CN202210945010.7A 2022-08-08 2022-08-08 Lead-zinc oxide ore separation method Pending CN115228615A (en)

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