CN114146821B - Zinc combined collecting agent and flotation method - Google Patents
Zinc combined collecting agent and flotation method Download PDFInfo
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- CN114146821B CN114146821B CN202111373704.XA CN202111373704A CN114146821B CN 114146821 B CN114146821 B CN 114146821B CN 202111373704 A CN202111373704 A CN 202111373704A CN 114146821 B CN114146821 B CN 114146821B
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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
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/01—Organic compounds containing nitrogen
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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
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention relates to a zinc combined collector and a flotation method, and the zinc combined collector comprises, by mass, 40-55 parts of O-alkyl-N-alkyl thiodicarbamate, 25-35 parts of N, N-dialkyl dithiocarbamate and 15-30 parts of thioglycollate. The zinc combined collecting agent has a good selective collecting effect on (iron) sphalerite, and can obviously reduce the arsenic pyrite content in zinc concentrate and improve the quality of the zinc concentrate by only consuming a small amount of the zinc combined collecting agent.
Description
Technical Field
The invention relates to a zinc combined collecting agent and a flotation method, belonging to the field of mineral separation.
Background
The (iron) sphalerite is used as a main mineral source of zinc metal, and has important significance in high-efficiency recycling. In the flotation recovery process of (iron) sphalerite, when the conventional zinc collecting agent and flotation process are adopted, copper sulfate is usually required to be added to activate the (iron) sphalerite, and under the condition that the arsenopyrite content in the ore is higher, the Cu content is higher 2+ The activation effect on the arsenopyrite can cause the consequences of large using amount of the collecting agent, high content of the arsenopyrite in the zinc concentrate and the like, and the quality of the zinc concentrate is seriously influenced. Meanwhile, in the subsequent zinc smelting process of the product, arsenic volatilizes together with zinc oxide and zinc hypoxide in the form of arsenic dioxide, and the recovery rate and the quality of the product are influenced.
The reason why the separation of arsenopyrite and (iron) sphalerite by flotation is difficult is that Cu in ore pulp 2+ Activation takes place on the surface of arsenopyrite, cu 2+ Reaction with As on mineral surfaces to form Cu 2 As and Cu 3 As 2 Isostable arsenic compounds, when using butyl xanthate as zinc scavenger, with Cu 2 As and Cu 3 As 2 The chemical action of the method leads the butyl xanthate to be tightly adsorbed on the surface of the arsenopyrite, greatly improves the floatability of the arsenopyrite and greatly increases the separation difficulty of the arsenopyrite and the (iron) sphalerite.
The applicant has previously developed a combined zinc collector for flotation of lead-zinc sulphide ore (see CN 202010669410.0), the active ingredients of which comprise 10-30 parts by weight of ammonium nitrate black powder, 30-50 parts by weight of ethidium nitrate and 30-50 parts by weight of 2-aminothiophenol, and the combined zinc collector has a good collecting capacity for zinc blende, but the usage amount is large.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide a zinc combined collector with strong selective collecting capability on sphalerite; the second purpose of the invention is to provide a flotation method.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a zinc combined collector comprises, by mass, 40-55 parts of O-alkyl-N-alkyl thionocarbamate, 25-35 parts of N, N-dialkyl dithiocarbamate and 15-30 parts of thioglycolic acid ester.
The zinc combined collecting agent can be used for solving the problem that the floatation separation of arsenopyrite and (iron) sphalerite is difficult, has strong selective collecting capability on the (iron) sphalerite, can effectively reduce the content of arsenopyrite in a zinc concentrate product obtained by floatation, has small medicament dosage, can reduce the production cost of a separation plant, and can meet the requirement of industrial production.
Further, the zinc combined collector comprises 45-55 parts of O-alkyl-N-alkyl thiodicarbamate, 28-32 parts of N, N-dialkyl dithiocarbamate and 20-25 parts of thioglycolate in parts by mass.
Further, the zinc combined collector includes 50 parts of O-alkyl-N-alkyl thionocarbamate, 30 parts of N, N-dialkyl dithiocarbamate, and 20 parts of thioglycolate.
Further, the O-alkyl-N-alkyl thionocarbamate is one or more of O-ethyl-N-ethyl thionocarbamate, O-isopropyl-N-ethyl thionocarbamate, O-ethyl-N-propyl thionocarbamate and O-allyl-N-isobutyl thionocarbamate.
Further, the N, N-dialkyl dithiocarbamate is one or more of N, N-diethyl dithiocarbamate propionitrile ester, N-diethyl dithiocarbamate allyl ester and N, N-diethyl dithiocarbamate acrylonitrile ester.
Further, the thioglycolic acid ester is one or more of ethyl thioglycolate, isopropyl thioglycolate and butyl thioglycolate.
Further, the preparation method of the zinc combined collector comprises the following steps: under normal temperature and pressure, mixing O-alkyl-N-alkyl thionocarbamate, N-dialkyl dithio carbamate and thioglycolic acid ester uniformly according to the proportion to obtain the product.
Preferably, the O-alkyl-N-alkylthionocarbamate, the N, N-dialkyldithiocarbamate and the thioglycolate are mixed and stirred for 0.5 to 1.5 hours.
Based on the same inventive concept, the invention also provides a flotation method, which comprises the following steps:
s1, providing raw ore and preparing into ore pulp;
wherein the raw ore contains zinc blende and arsenopyrite;
s2, adding copper sulfate, calcium oxide, no. 2 oil and the zinc combined collecting agent into the ore pulp of the S1, and performing rough concentration to obtain rough concentrate and rough tailings;
wherein, the adding amount of the zinc combined collector relative to the raw ore is 10-50g/t;
s3, performing scavenging on the rougher tailings obtained in the S2 for 2-4 times, returning the first scavenging concentrate to rougher flotation, and returning other scavenging concentrates to last scavenging;
wherein, before each scavenging, copper sulfate and the zinc combined collecting agent are added, and the adding amount of the zinc combined collecting agent relative to the raw ore is 5-20g/t;
and (3) carrying out concentration on the rough concentration concentrate obtained in the step (2) for 3-5 times, adding calcium oxide before each concentration, returning the first concentration tailings to rough concentration, and returning other concentration tailings to the last concentration respectively to obtain zinc concentrate.
Furthermore, in S2, the addition amount of copper sulfate relative to the raw ore is 50-200g/t, the addition amount of calcium oxide relative to the raw ore is 500-2000g/t, and the addition amount of No. 2 oil relative to the raw ore is 10-20g/t.
Further, in S3, 2 times of scavenging are performed; during the first scavenging, the adding amount of copper sulfate relative to the raw ore is 20-100g/t, and the adding amount of the zinc combined collecting agent relative to the raw ore is 10-20g/t; and during the second scavenging, the adding amount of the copper sulfate relative to the raw ore is 10-50g/t, and the adding amount of the zinc combined collector relative to the raw ore is 5-10g/t.
Further, in S3, concentration is performed 3 times; from the first time of concentration to the third time of concentration, the addition amount of the calcium oxide relative to the raw ore is 200-1000g/t, 100-500g/t and 0-200g/t in sequence.
Furthermore, in the raw ore, the grade of Pb is 0.1-0.5%, the grade of Zn is 0.5-1.1%, and the grade of As is 0.4-1%.
The zinc combined collector is different from the conventional xanthate zinc collector, and when the xanthate collector is used as the collector of (iron) zinc blende, the collector can generate stronger collecting effect on arsenopyrite, and the collector does not pass through Cu 2+ The activated arsenic pyrite surface is oxidized by the xanthate collecting agent to generate double xanthates which act on the arsenic pyrite surface to improve the floatability of the arsenic pyrite surface, and the activated arsenic pyrite surface is coated with Cu 2+ Reaction with As on mineral surfaces to form Cu 2 As and Cu 3 As 2 After the stable arsenic compound is added, xanthate collector and Cu 2 As and Cu 3 As 2 The strong chemical action of other species enables the collector to be tightly adsorbed on the surface of arsenic pyrite, and greatly improves the flotation separation difficulty of the arsenic pyrite and the (iron) zinc blende. The zinc combined collector has stronger electrochemical stability, and cannot be oxidized to act on the surface of arsenopyrite; since the O-alkyl-N-alkylsulfocarbamate, N-dialkyldithiocarbamate are p-substituted with Cu 2+ Of activated (iron) blende surfacesThe copper sulfide-like species has extremely strong selectivity effect, and the thioglycollate has strong affinity to zinc atoms and can act on the copper sulfide-like species without Cu 2+ The activated (iron) sphalerite surface is floated, and the N, N-dialkyl dithiocarbamate has certain foaming capacity and can play a role in regulating foam, so that after the three substances are combined to form the combined collecting agent, the synergistic effect generated by the combined collecting agent can promote the combined collecting agent to comprehensively recover the (iron) sphalerite, the floating probability of arsenopyrite is greatly reduced, the quality of zinc concentrate is ensured, the zinc recovery rate is improved, and the using amount of the combined collecting agent can be reduced.
The zinc combined collector has a good selective collecting effect on (iron) sphalerite, can obviously reduce the content of arsenopyrite in zinc concentrate, and improves the quality of the zinc concentrate. Besides the strong selective collecting effect on the (iron) sphalerite, the zinc (iron) sphalerite composite material also has certain foamability, and the consumption of a foaming agent in the production process can be reduced. In conclusion, the collector is beneficial to realizing the high-efficiency recovery of the (iron) sphalerite, and meanwhile, the production cost can be reduced.
Drawings
Figure 1 is a flow diagram of a flotation process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person. Unless otherwise specified, the percentages in the present invention refer to mass percentages.
Example 1
The Pb grade, the Zn grade and the As grade in certain lead-zinc sulfide ore lead dressing tailings are 0.30%, 0.72% and 0.86%, wherein Zn mainly exists in the form of zinc blende, as mainly exists in the form of arsenic pyrite, the lead dressing tailings are used As ore feeding, the dressing process flow is shown in figure 1, the flotation process is one-step, three-step and two-step, and except the dosage of the zinc combined collecting agent, the dosages of other flotation agents are shown in figure 1.
The flotation process specifically comprises the following steps:
1) Roughing: adding copper sulfate 120 g/t-raw ore, calcium oxide 1000 g/t-raw ore, no. 2 oil 15 g/t-raw ore and zinc combined collector 17.5 g/t-raw ore into the ore pulp containing zinc sulfide ore for roughing to obtain roughed concentrate and roughed tailings;
2) 2 times of scavenging: performing scavenging on the rough tailings for 2 times, adding 10 g/t-raw ore and 50 g/t-raw ore of copper sulfate before first scavenging, adding 5 g/t-raw ore and 30 g/t-raw ore of zinc combined collector before second scavenging, returning the first scavenging concentrate to rough concentration, returning the second scavenging concentrate to first scavenging, and finally obtaining tailings after finishing the scavenging;
3) And (3) fine selection: the roughing concentrate is subjected to fine concentration for 3 times, calcium oxide is added before fine concentration each time, the first-time fine concentration tailings and the first-time scavenging concentrate are combined and then return to roughing, the second-time fine concentration tailings and the third-time fine concentration tailings return to the last fine concentration respectively, and after the third-time fine concentration is finished, zinc concentrate is finally obtained;
wherein, from the first fine concentration to the third fine concentration, the addition amount of the calcium oxide relative to the raw ore is 500 g/t-raw ore, 250 g/t-raw ore and 125 g/t-raw ore in sequence.
Weighing O-ethyl-N-ethylthionocarbamate, N-diethyldithiocarbamate propionitrile ester and ethyl thioglycolate according to the mass part of 45. The lead tailings are subjected to a beneficiation test by using the collecting agent, and the amount of the collecting agent in each flotation operation is shown in table 1, and the final flotation test result is shown in table 2.
TABLE 1 amount of collector used in each job (g/t)
TABLE 2 flotation separation test results
In the obtained zinc concentrate product, the Zn grade is 44.98 percent, the As grade is 1.39 percent, the Zn recovery rate is 79.39 percent, and the As recovery rate is 2.10 percent.
Comparative example 1
The lead tailings were subjected to a beneficiation test using butyl xanthate as a zinc collector (only the difference from example 1 is in the type of the collector and the amount of the collector), the amount of the collector used in each flotation operation is shown in table 3, and the final flotation test result is shown in table 4.
TABLE 3 collecting agent dosage (g/t) for each job
TABLE 4 flotation separation test results
In the obtained zinc concentrate product, the Zn grade is 25.97%, the As grade is 20.91%, the Zn recovery rate is 78.63%, and the As recovery rate is 56.02%.
By comparison, when the dosage of the zinc combined collector in example 1 is only 59.1% of the dosage of the conventional butyl xanthate, a better beneficiation index than that of the butyl xanthate can be obtained, which shows that the zinc combined collector in example 1 has a better flotation effect and a smaller dosage of chemicals.
Comparative example 2
The lead tailings were subjected to a beneficiation test (different from example 1 only in the type of the collector) using O-ethyl-N-ethylthionocarbamate as a zinc collector, the amount of the collector used in each flotation operation is shown in table 5, and the final flotation test results are shown in table 6.
TABLE 5 collecting agent dosage (g/t) for each job
TABLE 6 flotation separation test results
In the obtained zinc concentrate product, the Zn grade is 45.96 percent, the As grade is 2.57 percent, the Zn recovery rate is 66.15 percent, and the As recovery rate is 3.21 percent.
Comparative example 3
The lead tailings were subjected to a beneficiation test (differing from example 1 only in the type of collector) using propionitrile N, N-diethyldithiocarbamate as a zinc collector, the amount of the collector used in each flotation operation is shown in table 7, and the final flotation test results are shown in table 8.
TABLE 7 collector usage (g/t) for each run
TABLE 8 flotation separation test results
The Zn grade in the zinc concentrate is 41.41 percent, the As grade is 3.18 percent, the Zn recovery rate is 63.27 percent, and the As recovery rate is 4.28 percent.
Comparative example 4
The lead tailings were subjected to a beneficiation test using ethyl thioglycolate as a zinc collector (only the difference from example 1 is in the type of the collector), the amount of the collector used in each flotation operation is shown in table 9, and the final flotation test result is shown in table 10.
TABLE 9 amount of collector used in each run (g/t)
TABLE 10 flotation separation test results
The Zn grade in the zinc concentrate is 42.53 percent, the As grade is 2.96 percent, the Zn recovery rate is 60.18 percent, and the As recovery rate is 3.76 percent.
Comparative example 5
And (2) weighing 45 parts of O-ethyl-N-ethylthiodicarbamate and N, N-diethyldithiocarbamate propionitrile ester at normal temperature and normal pressure, and mixing and stirring for 0.5 hour to obtain the zinc combined collector of the comparative example. The lead tailings were subjected to a beneficiation test (different from example 1 only in the type of the collector), the amount of the collector used in each flotation operation is shown in table 11, and the final flotation test result is shown in table 12.
TABLE 11 collector usage (g/t) for each run
TABLE 12 flotation separation test results
The Zn grade in the zinc concentrate is 43.18 percent, the As grade is 2.78 percent, the Zn recovery rate is 65.35 percent, and the As recovery rate is 3.75 percent.
Example 2
The flotation process specifically comprises the following steps of:
1) Roughing: adding 120 g/t-raw copper sulfate, 1000 g/t-raw calcium oxide, 15 g/t-raw No. 2 oil and 25 g/t-raw zinc combined collecting agent into the ore pulp containing zinc sulfide for roughing to obtain roughed concentrate and roughed tailings;
2) 2 times of scavenging: performing scavenging on the rough tailings for 2 times, adding 10 g/t-raw ore and 50 g/t-raw ore of copper sulfate before first scavenging, adding 5 g/t-raw ore and 30 g/t-raw ore of zinc combined collector before second scavenging, returning the first scavenging concentrate to rough concentration, returning the second scavenging concentrate to first scavenging, and finally obtaining tailings after finishing the scavenging;
3) And (3) fine selection: the roughing concentrate is subjected to fine concentration for 3 times, calcium oxide is added before fine concentration each time, the first-time fine concentration tailings and the first-time scavenging concentrate are combined and then return to roughing, the second-time fine concentration tailings and the third-time fine concentration tailings return to the last fine concentration respectively, and after the third-time fine concentration is finished, zinc concentrate is finally obtained;
wherein, from the first fine concentration to the third fine concentration, the addition amount of the calcium oxide relative to the raw ore is 500 g/t-raw ore, 250 g/t-raw ore and 125 g/t-raw ore in sequence.
Weighing O-allyl-N-isobutyl thionocarbamate, N-diethyldithiocarbamate acrylonitrile ester and isopropyl thioglycolate according to the mass part of 55. The zinc combined collector is used for carrying out mineral separation tests on the lead-separated tailings, the dosage of the collector in each flotation operation is shown in table 13, and the final flotation test result is shown in table 14.
TABLE 13 collector usage (g/t) for each run
TABLE 14 flotation separation test results
The Zn grade in the zinc concentrate is 46.21 percent, the As grade is 1.27 percent, the Zn recovery rate is 81.16 percent, and the As recovery rate is 3.18 percent.
Comparative example 6
The lead tailings were subjected to a beneficiation test using butyl xanthate as a zinc collector (only the difference from example 2 is in the type of the collector and the amount of the collector), table 15 shows the amount of the collector used in each flotation operation, and table 16 shows the final flotation test results.
TABLE 15 collecting agent dosages (g/t) for each job
TABLE 16 results of flotation separation test
The Zn grade in the zinc concentrate is 26.21 percent, the As grade is 16.77 percent, the Zn recovery rate is 81.18 percent, and the As recovery rate is 65.23 percent.
The comparison shows that when the dosage of the zinc combined collector in the example 2 is only 57.1% of the dosage of the conventional butyl xanthate, a better beneficiation index than the butyl xanthate can be obtained, which indicates that the zinc combined collector in the example 2 has a better flotation effect and less medicament dosage.
Comparative example 7
The lead tailings were subjected to a beneficiation test using O-allyl-N-isobutyl thionocarbamate as a zinc collector (only different from example 2 in the type of collector), the amount of the collector used in each flotation operation is shown in table 17, and the final flotation test results are shown in table 18.
TABLE 17 amount of collector used in each run (g/t)
TABLE 18 flotation separation test results
The Zn grade in the zinc concentrate is 42.48 percent, the As grade is 2.47 percent, the Zn recovery rate is 68.45 percent, and the As recovery rate is 5.01 percent.
Comparative example 8
The lead tailings were subjected to a beneficiation test (different from example 2 only in the type of the collector) using acrylonitrile N, N-diethyldithiocarbamate as a zinc collector, the amount of the collector used in each flotation operation is shown in Table 19, and the final flotation test result is shown in Table 20.
TABLE 19 collector usage (g/t) for each run
TABLE 20 flotation separation test results
The Zn grade in the zinc concentrate is 44.16 percent, the As grade is 2.25 percent, the Zn recovery rate is 69.28 percent, and the As recovery rate is 4.36 percent.
Comparative example 9
The lead tailings were subjected to a beneficiation test using isopropyl thioglycolate as a zinc collector (only different from example 2 in the type of the collector), where the amount of the collector used in each flotation operation is shown in table 21, and the final flotation test result is shown in table 22.
TABLE 21 collector usage (g/t) for each run
TABLE 22 flotation separation test results
The Zn grade in the zinc concentrate is 40.25 percent, the As grade is 2.93 percent, the Zn recovery rate is 71.58 percent, and the As recovery rate is 6.49 percent.
Comparative example 10
And weighing the O-allyl-N-isobutyl thionocarbamate and the N, N-diethyl dithiocarbamic acid acrylonitrile ester according to the mass part of 55. The lead tailings were subjected to a beneficiation test (different from example 2 only in the type of the collector), the amount of the collector used in each flotation operation is shown in table 23, and the final flotation test result is shown in table 24.
TABLE 23 collector usage (g/t) for each run
TABLE 24 flotation separation test results
The Zn grade in the zinc concentrate is 43.87 percent, the As grade is 2.38 percent, the Zn recovery rate is 64.73 percent, and the As recovery rate is 4.34 percent.
The zinc flotation test is carried out on the same lead tailings by adopting a novel combined collector, butyl xanthate, single O-alkyl-N-alkyl thiodiglyco carbamate, N-dialkyl dithiocarbamic acid ester, thioglycolic acid ester, O-alkyl-N-alkyl thiodiglyco carbamate, N-dialkyl dithiocarbamic acid ester combined collector and other collectors, and test results show that the using amount of the zinc combined collector is far lower than that of the conventional collector, namely butyl xanthate, the As content in the finally obtained zinc concentrate product is obviously reduced, the arsenopyrite collecting capability is poor, and the selective collecting effect on (iron) zinc blende is better. In addition, compared with single O-alkyl-N-alkyl thionocarbamate, N-dialkyl dithiocarbamic acid ester and thioglycolic acid ester collecting agents and O-alkyl-N-alkyl thionocarbamate and N, N-dialkyl dithiocarbamic acid ester combined collecting agents, the zinc combined collecting agent has stronger collecting capacity on (iron) zinc blende under the same dosage condition, and the flotation effect is better than the expected effect obtained by combining the O-alkyl-N-alkyl thionocarbamate, the N, N-dialkyl dithiocarbamic acid ester and the thioglycolic acid ester.
The above examples are set forth so that this disclosure will be understood in all instances to be considered illustrative and not restrictive, and that various modifications and equivalent arrangements may be devised by those skilled in the art after reading this disclosure and are intended to be included within the scope of the appended claims.
Claims (10)
1. The zinc combined collector is characterized by comprising, by mass, 45-55 parts of O-alkyl-N-alkyl thionocarbamate, 25-32 parts of N, N-dialkyl dithiocarbamic acid ester and 20-25 parts of thioglycolic acid ester.
2. A zinc composite collector according to claim 1 which includes 45-55 parts of O-alkyl-N-alkyl thionocarbamate, 28-32 parts of N, N-dialkyl dithiocarbamate and 20-25 parts of thioglycolic acid ester by mass parts.
3. A zinc composite collector according to claim 1 wherein the O-alkyl-N-alkyl thionocarbamate is one or more of O-ethyl-N-ethyl thionocarbamate, O-isopropyl-N-ethyl thionocarbamate, O-ethyl-N-propyl thionocarbamate, O-allyl-N-isobutyl thionocarbamate.
4. A zinc composite collector according to claim 1 wherein the N, N-dialkyl dithiocarbamate is one or more of propionitrile N, N-diethyl dithiocarbamate, propenyl N, N-diethyl dithiocarbamate, or acrylonitrile N, N-diethyl dithiocarbamate.
5. The zinc composite collector according to claim 1, wherein the thioglycolate is one or more of ethyl thioglycolate, isopropyl thioglycolate, butyl thioglycolate.
6. The combined collector of claim 1, wherein the method for preparing the combined collector is as follows: under normal temperature and pressure, the O-alkyl-N-alkyl sulfide carbamate, the N, N-dialkyl dithiocarbamate and the thioglycolate are uniformly mixed according to the proportion to obtain the compound.
7. A flotation process, characterized by the steps of:
s1, providing raw ore and preparing into ore pulp;
wherein the raw ore contains zinc blende and arsenopyrite;
s2, adding copper sulfate, calcium oxide, no. 2 oil and the zinc combined collector of any one of claims 1-6 into the ore pulp of the S1, and performing roughing to obtain roughed concentrate and roughed tailings;
wherein, the adding amount of the zinc combined collector relative to the raw ore is 10-50g/t;
s3, performing scavenging on the rougher tailings obtained in the S2 for 2-4 times, returning the first scavenging concentrate to rougher flotation, and returning other scavenging concentrates to last scavenging;
wherein, before each scavenging, copper sulfate and the zinc combined collector as claimed in any one of claims 1 to 6 are added, and the adding amount of the zinc combined collector relative to the raw ore is 5 to 20g/t;
and (3) carrying out concentration on the rough concentration concentrate obtained in the step (2) for 3-5 times, adding calcium oxide before each concentration, returning the first concentration tailings to rough concentration, and returning other concentration tailings to the last concentration respectively to obtain zinc concentrate.
8. A flotation process according to claim 7, wherein in S2, copper sulphate is added in an amount of 50-200g/t relative to the crude ore, calcium oxide is added in an amount of 500-2000g/t relative to the crude ore, and No. 2 oil is added in an amount of 10-20g/t relative to the crude ore.
9. A flotation process according to claim 7, wherein in S3, 2 sweeps are performed; during the first scavenging, the adding amount of copper sulfate relative to the raw ore is 20-100g/t, and the adding amount of the zinc combined collecting agent relative to the raw ore is 10-20g/t; and during the second scavenging, the adding amount of the copper sulfate relative to the raw ore is 10-50g/t, and the adding amount of the zinc combined collector relative to the raw ore is 5-10g/t.
10. A flotation process according to claim 7, wherein in S3, 3 beneficiations are carried out; from the first time of concentration to the third time of concentration, the addition amount of the calcium oxide relative to the raw ore is 200-1000g/t, 100-500g/t and 0-200g/t in sequence.
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