CN114515652B - Flotation method for residual slope product type lead zinc sulfide ore - Google Patents

Flotation method for residual slope product type lead zinc sulfide ore Download PDF

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CN114515652B
CN114515652B CN202210066468.5A CN202210066468A CN114515652B CN 114515652 B CN114515652 B CN 114515652B CN 202210066468 A CN202210066468 A CN 202210066468A CN 114515652 B CN114515652 B CN 114515652B
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lead
foam
tailings
scavenging
roughing
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CN114515652A (en
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曾小辉
饶金山
陈志强
罗祖俊
胡红喜
邓志平
张颖
文保林
刘超
高无忌
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Jiangxi Yifeng Wanguo Mining Co ltd
Institute of Resource Utilization and Rare Earth Development of Guangdong Academy of Sciences
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Jiangxi Yifeng Wanguo Mining Co ltd
Institute of Resource Utilization and Rare Earth Development of Guangdong Academy of Sciences
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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
    • B03D1/02—Froth-flotation processes
    • 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
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/012—Organic compounds containing sulfur
    • 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
    • B03D1/14—Flotation machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Abstract

The invention belongs to the technical field of mineral processing, and particularly discloses a flotation method of a residual-slope-type lead-zinc sulfide ore. The flotation method of the residual-slope-accumulation type lead-zinc sulfide ore provided by the invention can realize good recovery of lead and comprehensive recovery of gold and silver.

Description

Flotation method for residual slope product type lead zinc sulfide ore
Technical Field
The invention relates to the technical field of mineral processing, in particular to a flotation method of residual-slope-accumulation type lead-zinc sulfide ore.
Background
The lead-zinc sulfide ore associated with gold and silver is generally separated by adopting a floatation method, so as to obtain lead concentrate containing gold and silver. The zinc sulfide ore is associated with the lead zinc sulfide ore with the residual gradient, but the lead zinc sulfide ore with the residual gradient is rare, and is different from other types of lead zinc ores, and belongs to the lead zinc sulfide ore with the residual gradient in the weathered ore deposit. The surface of lead sulfide is locally oxidized under the long-time weathering effect, the floatability is reduced, the grade and recovery rate of lead concentrate are hardly improved, the content of gold and silver in the obtained lead concentrate is low, the recovery rate is not high, and the waste of resources is caused.
Therefore, research is necessary for the residual-slope-type lead zinc sulfide ores associated with gold and silver so as to provide a flotation method capable of comprehensively recovering gold and silver.
Disclosure of Invention
The invention mainly solves the technical problem of providing a flotation method for the residual-slope-volume type lead-zinc sulfide ore, which can realize good recovery of lead and comprehensive recovery of gold and silver.
In order to solve the technical problems, the invention provides a flotation method of the residual-slope-accumulation type lead zinc sulfide ore, which comprises the following steps:
(1) Grinding the residual slope product type lead-zinc sulfide ore raw ore to prepare an ore grinding product, wherein the fineness of the ore grinding product is-0.075 mm and accounts for 65-70%, and 240-260 g/t of sodium sulfide and 25-35 g/t of collecting agent are added in the ore grinding process;
(2) 900-1100 g/t of zinc sulfate and 200-300 g/t of sodium sulfite are added into the ground mineral product, 10-15 g/t of collector is added, and lead roughing is carried out after stirring, so that lead roughing foam and lead roughing tailings are obtained;
(3) Adding 10-15 g/t of collector into the lead roughing tailings, stirring, and then carrying out primary lead scavenging, wherein foam of the primary lead scavenging returns to lead roughing operation, and the tailings of the primary lead scavenging enter secondary lead scavenging;
adding a collector to 5-10 g/t of tailings subjected to primary lead scavenging, stirring, and then carrying out secondary lead scavenging, wherein foam subjected to secondary lead scavenging returns to primary lead scavenging operation, and the tailings subjected to secondary lead scavenging serve as lead tailings;
(4) 280-300 g/t of sodium sulfide, 260-320 g/t of zinc sulfate and 80-110 g/t of sodium sulfite are added into the lead roughing foam, the lead roughing foam is stirred and then subjected to primary lead concentration, tailings after primary lead concentration return to lead roughing, and the foam enters secondary lead concentration;
adding 145-155 g/t of sodium sulfide, 190-200 g/t of zinc sulfate and 75-85 g/t of sodium sulfite into the foam obtained by primary lead concentration, stirring, carrying out secondary lead concentration, returning tailings obtained by secondary lead concentration to primary lead concentration operation, and allowing the foam to enter tertiary lead concentration;
adding 140-155 g/t of sodium sulfide, 110-125 g/t of zinc sulfate and 55-65 g/t of sodium sulfite into the foam for secondary lead concentration, stirring and then carrying out tertiary lead concentration, returning tailings after tertiary lead concentration to secondary lead concentration operation, wherein the foam is lead concentrate containing gold and silver;
wherein the collecting agent is cresol black drug.
In a preferred embodiment of the present invention, the collecting agent cresol black drug is further added with a higher alcohol, wherein the higher alcohol is a monohydric alcohol containing 6 to 14 carbon atoms. The addition of the higher alcohol not only can regulate the foam performance of the cresol black drug, but also can synergistically enhance the collecting effect.
As a preferred embodiment of the invention, the content of the higher alcohol in the collecting agent is 1-30% by mass.
Preferably, the mass percentage content of the higher alcohol in the collector is 15-25%.
Further preferably, the mass percentage content of the higher alcohol in the collector is 20%. Namely the collecting agent consists of cresol black drug and higher alcohol, wherein the mass ratio of the cresol black drug to the higher alcohol is 8:2.
In a preferred embodiment of the present invention, the higher alcohol is any one or a mixture of several of monohydric alcohols having 8 to 12 carbon atoms, more preferably a mixture of several of monohydric alcohols having 8 to 12 carbon atoms.
As a more preferred embodiment of the invention, the flotation process comprises the steps of:
(1) Grinding the residual slope product type lead-zinc sulfide ore raw ore to prepare an ore grinding product, wherein the fineness of the ore grinding product is-0.075 mm and accounts for 65-70%, and 250g/t of sodium sulfide and 30g/t of collecting agent are added in the ore grinding process;
(2) 1000g/t of zinc sulfate and 250g/t of sodium sulfite are added into the ground mineral product, 12g/t of collector is added, and after stirring, lead roughing is carried out, so that lead roughing foam and lead roughing tailings are obtained;
(3) Adding 14g/t of a collector into the lead roughing tailings, stirring, and then carrying out primary lead scavenging, wherein foam of the primary lead scavenging returns to lead roughing operation, and the tailings of the primary lead scavenging enter secondary lead scavenging;
adding 7g/t of a collector into the tailings subjected to primary lead scavenging, stirring, and then carrying out secondary lead scavenging, wherein foam subjected to secondary lead scavenging returns to primary lead scavenging operation, and the tailings subjected to secondary lead scavenging serve as lead tailings;
(4) Adding 300g/t of sodium sulfide, 300g/t of zinc sulfate and 100g/t of sodium sulfite into the lead roughing foam, stirring, carrying out primary lead concentration, returning tailings after primary lead concentration to lead roughing, and allowing the foam to enter secondary lead concentration;
150g/t of sodium sulfide, 200g/t of zinc sulfate and 80g/t of sodium sulfite are added into the foam for primary lead concentration, secondary lead concentration is carried out after stirring, tailings after secondary lead concentration are returned to primary lead concentration operation, and the foam enters into tertiary lead concentration;
150g/t of sodium sulfide, 120g/t of zinc sulfate and 60g/t of sodium sulfite are added into the foam for secondary lead concentration, the three-time lead concentration is carried out after stirring, tailings after the three-time lead concentration are returned to the secondary lead concentration operation, and the foam is lead concentrate containing gold and silver;
wherein the collecting agent is a mixed agent of cresol black drug and higher alcohol, and the mass ratio of the cresol black drug to the higher alcohol is 8:2.
Aiming at the characteristics of the residual slope accumulation type lead-zinc sulfide ore, lead in the residual slope accumulation type lead-zinc sulfide ore mainly exists in galena, the surface of the lead-zinc sulfide ore is generally wrapped by oxidized and changed lead alum, the surface of the lead-zinc sulfide ore is oxidized and changed under the weathering effect, and the floatability of the lead sulfide is reduced, so that sodium sulfide and a collector are added into the ore grinding to realize the surface oxidized lead sulfide vulcanization, and the granularity of an ore grinding product is controlled, and the lead sulfide with proper granularity floats in a mill through the ore grinding vulcanization and the collector collection, so that the excessive grinding is avoided.
The method of the invention adopts reasonable flotation process design, is matched with a proper medicament system and proper dissociation degree, thereby not only improving the dissociation degree of gold-silver carrier minerals, but also avoiding overgrinding, strengthening the comprehensive collection of gold-silver minerals and improving the grade and recovery rate of lead concentrate.
The flotation method of the residual-slope-accumulation-type lead-zinc sulfide ore provided by the invention can realize good recovery of lead, and simultaneously realize comprehensive recovery of gold and silver, thereby improving recovery of silver and gold in lead concentrate. The lead concentrate containing gold and silver obtained by the flotation method has the lead grade of about 20%, the silver content of about 600g/t and the gold content of about 10g/t, and the gold and silver grade is obviously improved. Compared with other collectors, for example, compared with conventional black agents and thiamine ester collectors, the collector provided by the invention has the advantages that the grade and recovery rate of lead, silver and gold in the obtained lead concentrate are high. Compared with xanthate collectors, the lead, silver and gold in the lead concentrate have higher grades under the condition of similar recovery rates of lead, silver and gold.
Drawings
FIG. 1 is a process flow diagram of the residual-slope-volume type lead zinc sulfide ore flotation method employed in examples 1-4 of the present invention;
FIG. 2 is a process flow diagram of the residual-slope-volume type lead zinc sulfide ore flotation process employed in comparative examples 1-3 of the present invention.
Detailed Description
The technical scheme of the invention is described in detail through specific examples.
In the following examples, the drugs used are commercially available products unless otherwise specified. The concentration or content in each example is mass percent. The dosage of the medicament is 250g/t for each ton of the residual-slope-type lead-zinc sulfide ore raw ore, namely 250g of the medicament is added for each ton of the residual-slope-type lead-zinc sulfide ore raw ore.
The following examples and comparative examples were conducted on the lead-zinc sulfide ore concentrate of the same composition, which contained 0.79% lead, 2.72% zinc, 0.12% copper, 33.47g/t silver and 0.93g/t gold.
Example 1
The embodiment provides a flotation method of the residual-slope-accumulation-type lead-zinc sulfide ore, wherein the flotation process is shown in a figure 1, and the adopted collector comprises 80% of cresol black (mass fraction) +20% of higher alcohol (mass fraction), and the method comprises the following steps:
s1: ore grinding
Adding 250g/t of sodium sulfide and 30g/t of a collecting agent (the composition is that cresol black 80% + higher alcohol 20%) into raw ore of the residual slope product type lead zinc sulfide ore, grinding to obtain an ore grinding product, wherein the fineness is-0.075 mm and accounts for 68.9%, and then performing lead roughing operation;
s2: lead roughing
1000g/t of zinc sulfate and 250g/t of sodium sulfite which are zinc mineral inhibitors are added into the ore grinding product, 12g/t of a collecting agent (the composition is that cresol black 80% + higher alcohol 20%) is added, and lead roughing is carried out after stirring for a plurality of minutes, so that lead roughing foam and lead roughing tailings are obtained;
s3: lead scavenging 1
Adding 14g/t of a collecting agent (the composition is that cresol black 80% + higher alcohol 20%) into the lead roughing tailings, stirring for a plurality of minutes, then carrying out lead scavenging 1, returning foam of the lead scavenging 1 to lead roughing, and carrying out lead scavenging 2 operation on the lead scavenging 1 tailings;
s4: lead scavenging 2
7g/t of a collecting agent (the composition is that cresol black 80% + higher alcohol 20%) is added into the lead scavenger 1 tailings, and after stirring for a plurality of minutes, lead scavenger 2 is carried out, the lead scavenger 2 foam returns to lead scavenger 1, and the lead scavenger 2 tailings are used as lead tailings;
s5: lead concentration 1
Adding 300g/t of sodium sulfide, 300g/t of zinc sulfate and 100g/t of sodium sulfite into the lead roughing foam, carrying out lead concentration 1, returning the tailings of lead concentration 1 to lead roughing, and allowing the foam to enter lead concentration 2;
s6: lead beneficiation 2
150g/t of sodium sulfide, 200g/t of zinc sulfate and 80g/t of sodium sulfite are added into the lead concentrating 1 foam, lead concentrating 2 is carried out, the tailings of lead concentrating 2 are returned to the lead concentrating 1, and the foam enters the lead concentrating 3;
s7: lead beneficiation 3
And 150g/t of sodium sulfide, 120g/t of zinc sulfate and 60g/t of sodium sulfite are added into the lead concentrating 2 foam, lead concentrating 3 is carried out, the tailings of the lead concentrating 3 are returned to the lead concentrating 2, and the foam is used as gold-silver-containing lead concentrate.
The obtained lead concentrate contains 24.72% of lead, 3.48% of copper, 598.94g/t of silver and 13.38g/t of gold, and the recovery rates of lead, copper, silver and gold are 77.69%, 76.24%, 44.26% and 35.74%.
Wherein the higher alcohol is market purchased goods and is mixed alcohol composed of monohydric alcohol with 8-10 carbon atoms.
Examples 2 to 4
Examples 2 to 4 compare the effects of using cresol black drug alone as a collector and using cresol black drug and higher alcohol in different proportions as collectors, and the other steps were the same as in example 1, and the comparison results are shown in Table 1 below.
TABLE 1
In the above table, example 2 was the use of cresol black alone as collector; the collector used in example 3 had the following composition: 90% of cresol black drug (mass fraction) +10% of higher alcohol (mass fraction); the collector used in example 4 had the following composition: 70% of cresol black drug (mass fraction) +30% of higher alcohol (mass fraction).
As can be seen from the concentrate indexes of different higher alcohol ratios in the table 1, as the higher alcohol ratio increases, the concentrate yield tends to decrease, the metal grade tends to increase, and the metal recovery rate tends to decrease. In the flotation process it was found that when no higher alcohols were present (i.e. example 2), the amount of flotation froth was large, especially when the ore fines content was high, and the flotation was difficult to stabilize. Proper amount of higher alcohol is added, so that flotation foam can be improved, and meanwhile, higher metal recovery rate is obtained; when the proportion of the higher alcohol exceeds 20%, the concentrate yield and the metal recovery rate are reduced, the metal grade of the concentrate is not greatly improved, and the medicament cost is increased; therefore, the collector composition preferably employed is: the cresol black drug is 80 percent+20 percent of higher alcohol, and can obtain better technical and economic indexes.
Comparative example 1
The residual-slope-accumulation type lead zinc sulfide ore adopted in the comparative example is the same as that in the example 1, the flotation process is shown in fig. 2, the adopted collector is Y-89, and the method comprises the following steps:
s1: ore grinding
250g/t of sodium sulfide is added into the raw ore of the residual slope product type lead zinc sulfide ore, ore grinding is carried out, an ore grinding product is obtained, the fineness is-0.075 mm and accounts for 68.6%, and then lead roughing operation is carried out;
s2: lead roughing
1000g/t of zinc sulfate and 250g/t of sodium sulfite which are zinc mineral inhibitors are added into the ground mineral products, 42g/t of collector is added, and lead roughing is carried out after stirring for a plurality of minutes to obtain lead roughing foam and lead roughing tailings;
s3: lead scavenging 1
Adding 14g/t of a collector into the lead roughing tailings, stirring for a plurality of minutes, then carrying out lead scavenging 1, returning foam of the lead scavenging 1 to lead roughing, and carrying out lead scavenging 2 operation on the lead scavenging 1 tailings;
s4: lead scavenging 2
Adding 7g/t of a collector into the tailings of the lead scavenging 1, stirring for a plurality of minutes, and then carrying out lead scavenging 2, wherein the foam of the lead scavenging 2 returns to the lead scavenging 1, and the tailings of the lead scavenging 2 are used as the tailings of the lead;
s5: lead concentration 1
Adding 300g/t of sodium sulfide, 300g/t of zinc sulfate and 100g/t of sodium sulfite into the lead roughing foam, carrying out lead concentration 1, returning the tailings of lead concentration 1 to lead roughing, and allowing the foam to enter lead concentration 2;
s6: lead beneficiation 2
150g/t of sodium sulfide, 200g/t of zinc sulfate and 80g/t of sodium sulfite are added into the lead concentrating 1 foam, lead concentrating 2 is carried out, the tailings of lead concentrating 2 are returned to the lead concentrating 1, and the foam enters the lead concentrating 3;
s7: lead beneficiation 3
And 150g/t of sodium sulfide, 120g/t of zinc sulfate and 60g/t of sodium sulfite are added into the lead concentrating 2 foam, lead concentrating 3 is carried out, the tailings of the lead concentrating 3 are returned to the lead concentrating 2, and the foam is used as gold-silver-containing lead concentrate.
The lead concentrate obtained in this comparative example contained 10.84% lead, 1.62% copper, 271.13g/t silver and 5.87g/t gold, with recovery of 74.89%, 73.49%, 44.23% and 34.45% lead, copper, silver and gold, respectively.
Compared with examples 1-4, the grade of lead, copper, silver and gold in the obtained lead concentrate is obviously reduced when the Y-89 collector is adopted.
Comparative example 2
The residual-slope-accumulation type lead zinc sulfide ore adopted in the comparative example is the same as that in the example 1, the flotation process is shown in fig. 2, the adopted collector is Z-200, and the method comprises the following steps:
s1: ore grinding
250g/t of sodium sulfide is added into the raw ore of the residual slope product type lead zinc sulfide ore, ore grinding is carried out, an ore grinding product is obtained, the fineness is-0.075 mm and accounts for 68.3%, and then lead roughing operation is carried out;
s2: lead roughing
1000g/t of zinc sulfate and 250g/t of sodium sulfite which are zinc mineral inhibitors are added into the ground mineral products, 42g/t of collector is added, and lead roughing is carried out after stirring for a plurality of minutes to obtain lead roughing foam and lead roughing tailings;
s3: lead scavenging 1
Adding 14g/t of a collector into the lead roughing tailings, stirring for a plurality of minutes, then carrying out lead scavenging 1, returning foam of the lead scavenging 1 to lead roughing, and carrying out lead scavenging 2 operation on the lead scavenging 1 tailings;
s4: lead scavenging 2
Adding 7g/t of a collector into the tailings of the lead scavenging 1, stirring for a plurality of minutes, and then carrying out lead scavenging 2, wherein the foam of the lead scavenging 2 returns to the lead scavenging 1, and the tailings of the lead scavenging 2 are used as the tailings of the lead;
s5: lead concentration 1
Adding 300g/t of sodium sulfide, 300g/t of zinc sulfate and 100g/t of sodium sulfite into the lead roughing foam, carrying out lead concentration 1, returning the tailings of lead concentration 1 to lead roughing, and allowing the foam to enter lead concentration 2;
s6: lead beneficiation 2
150g/t of sodium sulfide, 200g/t of zinc sulfate and 80g/t of sodium sulfite are added into the lead concentrating 1 foam, lead concentrating 2 is carried out, the tailings of lead concentrating 2 are returned to the lead concentrating 1, and the foam enters the lead concentrating 3;
s7: lead beneficiation 3
And 150g/t of sodium sulfide, 120g/t of zinc sulfate and 60g/t of sodium sulfite are added into the lead concentrating 2 foam, lead concentrating 3 is carried out, the tailings of the lead concentrating 3 are returned to the lead concentrating 2, and the foam is used as gold-silver-containing lead concentrate.
The lead concentrate obtained in this comparative example contained 5.48%, 0.82% copper, 225.46g/t silver and 2.97g/t gold, and the recovery rates of lead, copper, silver and gold were 18.01%, 17.68%, 17.48% and 8.29%, respectively.
Compared with examples 1-4, when the Z-200 collector is adopted, the grade of lead, copper, silver and gold in the obtained lead concentrate is obviously reduced, and the recovery rate is also obviously reduced.
Comparative example 3
The residual-slope-accumulation type lead sulfide zinc ore treated in the comparative example is the same as in example 1, the flotation process is shown in fig. 2, the adopted collector is 25# black medicine, and the method comprises the following steps:
s1: ore grinding
250g/t of sodium sulfide is added into the raw ore of the residual slope product type lead zinc sulfide ore, ore grinding is carried out, an ore grinding product is obtained, the fineness is-0.075 mm and accounts for 69.1%, and then lead roughing operation is carried out;
s2: lead roughing
1000g/t of zinc sulfate and 250g/t of sodium sulfite which are zinc mineral inhibitors are added into the ground mineral products, 42g/t of collector is added, and lead roughing is carried out after stirring for a plurality of minutes to obtain lead roughing foam and lead roughing tailings;
s3: lead scavenging 1
Adding 14g/t of a collector into the lead roughing tailings, stirring for a plurality of minutes, then carrying out lead scavenging 1, returning foam of the lead scavenging 1 to lead roughing, and carrying out lead scavenging 2 operation on the lead scavenging 1 tailings;
s4: lead scavenging 2
Adding 7g/t of a collector into the tailings of the lead scavenging 1, stirring for a plurality of minutes, and then carrying out lead scavenging 2, wherein the foam of the lead scavenging 2 returns to the lead scavenging 1, and the tailings of the lead scavenging 2 are used as the tailings of the lead;
s5: lead concentration 1
Adding 300g/t of sodium sulfide, 300g/t of zinc sulfate and 100g/t of sodium sulfite into the lead roughing foam, carrying out lead concentration 1, returning the tailings of lead concentration 1 to lead roughing, and allowing the foam to enter lead concentration 2;
s6: lead beneficiation 2
150g/t of sodium sulfide, 200g/t of zinc sulfate and 80g/t of sodium sulfite are added into the lead concentrating 1 foam, lead concentrating 2 is carried out, the tailings of lead concentrating 2 are returned to the lead concentrating 1, and the foam enters the lead concentrating 3;
s7: lead beneficiation 3
And 150g/t of sodium sulfide, 120g/t of zinc sulfate and 60g/t of sodium sulfite are added into the lead concentrating 2 foam, lead concentrating 3 is carried out, the tailings of the lead concentrating 3 are returned to the lead concentrating 2, and the foam is used as gold-silver-containing lead concentrate.
The lead concentrate obtained in this comparative example contained 9.53% lead, 1.42% copper, 268.83g/t silver, 5.16g/t gold, and the recovery rates of lead, copper, silver and gold were 24.75%, 24.28%, 16.48% and 11.38%, respectively.
Compared with examples 1-4, when the No. 25 black drug collector is adopted, the grade of lead, copper, silver and gold in the obtained lead concentrate is obviously reduced, and the recovery rate is also obviously reduced.
According to the embodiment and the comparative example, the method improves the content of gold and silver in the lead concentrate through a reasonable flotation process, and realizes the comprehensive recovery of silver and gold in the lead concentrate.
While the invention has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims (4)

1. A method for floating lead zinc sulfide ores with residual slope, which is characterized by comprising the following steps:
(1) Grinding the residual slope product type lead-zinc sulfide ore raw ore to prepare an ore grinding product, wherein the fineness of the ore grinding product is-0.075 mm and accounts for 65-70%, and 240-260 g/t of sodium sulfide and 25-35 g/t of collecting agent are added in the ore grinding process;
(2) 900-1100 g/t of zinc sulfate and 200-300 g/t of sodium sulfite are added into the ground mineral product, 10-15 g/t of collector is added, and lead roughing is carried out after stirring, so that lead roughing foam and lead roughing tailings are obtained;
(3) Adding 10-15 g/t of collector into the lead roughing tailings, stirring, and then carrying out primary lead scavenging, wherein foam of the primary lead scavenging returns to lead roughing operation, and the tailings of the primary lead scavenging enter secondary lead scavenging;
adding a collector to 5-10 g/t of tailings subjected to primary lead scavenging, stirring, and then carrying out secondary lead scavenging, wherein foam subjected to secondary lead scavenging returns to primary lead scavenging operation, and the tailings subjected to secondary lead scavenging serve as lead tailings;
(4) 280-300 g/t of sodium sulfide, 260-320 g/t of zinc sulfate and 80-110 g/t of sodium sulfite are added into the lead roughing foam, the lead roughing foam is stirred and then subjected to primary lead concentration, tailings after primary lead concentration return to lead roughing, and the foam enters secondary lead concentration;
adding 145-155 g/t of sodium sulfide, 190-200 g/t of zinc sulfate and 75-85 g/t of sodium sulfite into the foam obtained by primary lead concentration, stirring, carrying out secondary lead concentration, returning tailings obtained by secondary lead concentration to primary lead concentration operation, and allowing the foam to enter tertiary lead concentration;
adding 140-155 g/t of sodium sulfide, 110-125 g/t of zinc sulfate and 55-65 g/t of sodium sulfite into the foam for secondary lead concentration, stirring and then carrying out tertiary lead concentration, returning tailings after tertiary lead concentration to secondary lead concentration operation, wherein the foam is lead concentrate containing gold and silver;
wherein the collecting agent is cresol black drug, and higher alcohol is added in the collecting agent, and the higher alcohol is any one or a mixture of more than one of monohydric alcohols containing 8-12 carbon atoms.
2. The flotation method according to claim 1, wherein the mass percentage of higher alcohols in the collector is 1-30%.
3. A flotation process according to claim 2, wherein the collector comprises 15 to 25% by mass of higher alcohols.
4. A flotation process according to claim 3, wherein the collector contains 20% by mass of higher alcohols.
CN202210066468.5A 2022-01-20 2022-01-20 Flotation method for residual slope product type lead zinc sulfide ore Active CN114515652B (en)

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