CN112474032B - Beneficiation method for willemite - Google Patents
Beneficiation method for willemite Download PDFInfo
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- CN112474032B CN112474032B CN202011013311.3A CN202011013311A CN112474032B CN 112474032 B CN112474032 B CN 112474032B CN 202011013311 A CN202011013311 A CN 202011013311A CN 112474032 B CN112474032 B CN 112474032B
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- acid
- octadecene
- willemite
- reverse flotation
- concentrate
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910052844 willemite Inorganic materials 0.000 title claims abstract description 44
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000011701 zinc Substances 0.000 claims abstract description 60
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 60
- 238000005188 flotation Methods 0.000 claims abstract description 56
- 239000012141 concentrate Substances 0.000 claims abstract description 51
- 239000002253 acid Substances 0.000 claims abstract description 32
- 230000002000 scavenging effect Effects 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 229910001748 carbonate mineral Inorganic materials 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims abstract description 4
- 150000004763 sulfides Chemical class 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007127 saponification reaction Methods 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 2
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 11
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 150000003568 thioethers Chemical class 0.000 abstract 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 16
- 239000011787 zinc oxide Substances 0.000 description 13
- 235000014692 zinc oxide Nutrition 0.000 description 13
- 238000011084 recovery Methods 0.000 description 11
- 235000010755 mineral Nutrition 0.000 description 10
- 239000003814 drug Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 229940105847 calamine Drugs 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052864 hemimorphite Inorganic materials 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 229910021646 siderite Inorganic materials 0.000 description 4
- CPYIZQLXMGRKSW-UHFFFAOYSA-N zinc;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Zn+2] CPYIZQLXMGRKSW-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- LGERWORIZMAZTA-UHFFFAOYSA-N silicon zinc Chemical compound [Si].[Zn] LGERWORIZMAZTA-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
Classifications
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- 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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
- B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
-
- 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
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a beneficiation method for willemite. The beneficiation method comprises the following steps: s1: grinding willemite until mineral monomers are dissociated, and adding sulfide salt into carbonate minerals to adjust the pH value of ore pulp to 11-12; s2: adding modified octadecene-9-acid into the ore pulp of the S1 for reverse flotation roughing to obtain reverse flotation roughing tailings and reverse flotation roughing concentrate; s3: the reverse flotation rougher tailings are subjected to primary concentration to obtain tailings; s4: adding modified octadecene-9-acid into the reverse flotation rough concentrate for scavenging to obtain zinc concentrate. The beneficiation method provided by the invention has the advantages that the simple process flow and the reagent system are adopted, the willemite and carbonate gangue minerals can be effectively separated by floatation, the willemite concentrate is effectively recovered and obtained, the technical index is good, the purposes of energy conservation, emission reduction and comprehensive utilization of resources are achieved, and the beneficiation method is suitable for beneficiation of low-grade willemite.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a mineral separation method of willemite.
Background
The willemite is refractory zinc oxide ore, aiming at the refractory zinc oxide ores such as the siderite, the most effective method at present is a sulfide xanthate flotation method, and aiming at refractory zinc oxide ores such as the siderite and the calamine, an amine flotation method is often adopted, but the two methods are difficult to efficiently recycle the siderite, so that the loss of zinc ore resources is caused. According to the report of related data, the foreign zinc oxide ore has a sorting recovery rate of 60% -70%, up to 78%; the sorting recovery rate of zinc oxide ores in China is 68 percent on average and is up to 73 percent at most. So far, no report is made on a mineral separation process for effectively recovering low-grade willemite with zinc grade lower than 5%.
The patent with publication number CN103721857A (publication date 20140416) discloses a preparation method of a willemite collector. However, the method aims at the ore willemite containing mud and dolomite gangue, and the raw ore has high zinc content and cannot be applied to the willemite with low zinc content.
Patent publication No. CN 102764690A (publication day 20121107) discloses a beneficiation method for treating low-grade refractory lead zinc oxide ores; but it is directed to lead zinc oxide rather than willemite.
The patent with publication No. CN101734686A (publication day 20100616) discloses a method for comprehensively utilizing middle and low grade zinc oxide ores (mainly willemite, calamine and siderite) with high added value in a green mode, but the obtained raw materials are recyclable, and are not beneficiation products.
Patent publication No. CN102671770A (publication No. 20120919) discloses a flotation separation method of calamine and quartz. But it is directed to calamine rather than willemite.
In a word, the beneficiation of the willemite can not obtain good beneficiation indexes, and the beneficiation of the low-grade willemite is not reported.
Therefore, the research and development of the beneficiation method for the willemite has important practical significance.
Disclosure of Invention
The invention aims to overcome the defect of the existing beneficiation method for low-grade willemite and provides a beneficiation method for the willemite. The beneficiation method provided by the invention has the advantages that the simple process flow and the reagent system are adopted, the willemite and carbonate gangue minerals can be effectively separated by floatation, the willemite concentrate is effectively recovered and obtained, the technical index is good, the purposes of energy conservation, emission reduction and comprehensive utilization of resources are achieved, and the beneficiation method is suitable for beneficiation of low-grade willemite.
In order to achieve the purpose of the invention, the invention adopts the following scheme:
a beneficiation method for willemite comprises the following steps:
s1: grinding willemite until mineral monomers are dissociated to obtain carbonate minerals, and adding sulfide salt into the carbonate minerals to adjust the pH value of ore pulp to be 11-12;
s2: adding modified octadecene-9-acid into the ore pulp of the S1 for reverse flotation roughing to obtain reverse flotation roughing tailings and reverse flotation roughing concentrate;
s3: the reverse flotation rougher tailings are subjected to primary concentration to obtain tailings;
s4: adding modified octadecene-9-acid into the reverse flotation rough concentrate for scavenging to obtain zinc concentrate.
The invention realizes the ore dressing of the willemite by the combination of sulfide and a specific collector, and specifically comprises the following steps:
firstly, grinding in the step S1 until gangue minerals such as willemite, carbonate and the like are fully dissociated, and then adding sulfide salt, wherein the addition of the sulfide salt can adjust the pH value on one hand and prevent zinc oxide from floating upwards on the other hand; and then in the step S2, the special collector is used for modifying octadecene-9-acid for reverse flotation, and then the ore concentrate of the willemite and the carbonate gangue mineral can be effectively separated by flotation after scavenging, so that the willemite concentrate is effectively recovered, the technical index is good, the purposes of energy conservation, emission reduction and comprehensive utilization of resources are achieved, and the method is suitable for the beneficiation of low-grade willemite.
Aiming at the willemite with the zinc content of 1.5-2.5%, the ore dressing method can finally obtain the willemite concentrate with the zinc content of 16-30% and the recovery rate of 70-77%.
Preferably, the ore is ground in S1 using a grinder.
Preferably, the addition amount of the sulfide salt in the S1 is 500-1500 g/t, calculated by raw ore, and the same is true.
More preferably, the addition amount of the sulfide salt in S1 is about 1000 g/t.
Preferably, the sulfide salt in S1 is one or more of sodium sulfide, sodium hydrosulfide or sodium persulfate.
Preferably, the modified octadecene-9-acid is obtained by treating the octadecene-9-acid with concentrated sulfuric acid and then adding strong alkali for saponification.
Specifically, putting octadecene-9-acid into a beaker, putting the beaker into a water bath kettle, controlling the temperature of the water bath to be about 90 ℃, slowly dripping a certain amount of concentrated sulfuric acid (the mass ratio of the octadecene-9-acid to the concentrated sulfuric acid is 5:1-10:1) into the beaker, and carrying out stirring reaction for 1-1.5 h to obtain a product 1; (2) And (3) putting a certain amount of the product 1 into a beaker, adding NaOH with the mass ratio of 3:1-5:1, controlling the temperature to be 80-90 ℃ and carrying out saponification reaction for about 2 hours to obtain the modified octadecene-9-acid.
Preferably, the amount of the modified octadecene-9-acid in S2 is 50 to 150g/t.
Preferably, the number of times of scavenging in S4 is 2, wherein the dosage of the modified octadecene-9-acid is 20-60 g/t during one scavenging; during secondary scavenging, the dosage of the modified octadecene-9-acid is 10-30 g/t.
More preferably, the dosage of the modified octadecene-9-acid is 40g/t in one scavenging process; during secondary scavenging, the dosage of the modified octadecene-9-acid is 20g/t.
Preferably, the zinc content in the silicon zinc ore is 1.5-2.5%.
Preferably, the zinc content of the zinc concentrate obtained in S4 is about 16 to 30%.
Compared with the prior art, the invention has the following beneficial effects:
the beneficiation method provided by the invention has the advantages that the simple process flow and the reagent system are adopted, the willemite and carbonate gangue minerals can be effectively separated by floatation, the willemite concentrate is effectively recovered and obtained, the technical index is good, the purposes of energy conservation, emission reduction and comprehensive utilization of resources are achieved, and the beneficiation method is suitable for beneficiation of low-grade willemite.
Drawings
FIG. 1 is a process flow diagram of the beneficiation process provided in example 1
Detailed Description
The invention is further illustrated below with reference to examples. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. The experimental procedures in the examples below, without specific details, are generally performed under conditions conventional in the art or recommended by the manufacturer; the raw materials, reagents and the like used, unless otherwise specified, are those commercially available from conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art in light of the above teachings are intended to be within the scope of the invention as claimed.
The modified octadecene-9-acid selected in each embodiment of the invention is prepared by the following method: (1) Placing a certain amount of octadecene-9-acid into a beaker, placing the beaker into a water bath kettle, controlling the temperature of the water bath to be about 90 ℃, slowly dripping a certain amount of concentrated sulfuric acid (the mass ratio of the octadecene-9-acid to the concentrated sulfuric acid is 5:1-10:1, in the invention, 8:1) into the beaker, and carrying out stirring reaction for 1-1.5 hours to obtain a product 1; (2) Putting a certain amount of the product 1 into a beaker, adding NaOH (4:1 in the invention) with the mass ratio of 3:1-5:1, controlling the temperature to be 80-90 ℃ and carrying out saponification reaction for about 2 hours to obtain the modified octadecene-9-acid.
Example 1
The zinc content of the ore is 1.99%, the ore dressing is carried out according to the technological process shown in figure 1, and the method specifically comprises the following steps:
(1) Grinding willemite until mineral monomers are dissociated, adding sodium sulfide into carbonate minerals, and adjusting the pH value of ore pulp;
(2) Adding modified octadecene-9-acid into the ore pulp obtained in the step (1) for reverse flotation roughing to obtain reverse flotation roughing tailings and reverse flotation roughing concentrate;
(3) The reverse flotation rougher tailings are subjected to primary concentration to obtain tailings;
(4) Adding modified octadecene-9-acid into the reverse flotation rough concentrate for scavenging to obtain zinc concentrate.
The zinc reverse flotation rougher is operated according to the dosage of the medicaments listed in table 1 to obtain reverse flotation rougher concentrate and reverse flotation rougher tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc recovery rate of the obtained zinc concentrate is 76.29 percent and the zinc content of the obtained zinc concentrate is 16.22 percent.
Example 2
The zinc content of the ore is 2.45%, the ore dressing step is consistent with that of the embodiment 1, and the reverse flotation roughing of zinc is operated according to the dosage of the medicaments listed in the table 1 to obtain reverse flotation rough concentrate and reverse flotation rough tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc recovery rate of the obtained zinc concentrate is 75.29 percent and the zinc content of the obtained zinc concentrate is 21.58 percent.
Example 3
The zinc content of the ore is 1.85%, the ore dressing step is consistent with that of the embodiment 1, and the reverse flotation roughing of zinc is operated according to the dosage of the medicaments listed in the table 1 to obtain reverse flotation rough concentrate and reverse flotation rough tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc concentrate obtained contains 29.34% of zinc and the zinc recovery rate is 70.36%.
Comparative example 1
The zinc content of the ore is 2.25%, the ore dressing step is consistent with that of the embodiment 1, and the reverse flotation roughing of zinc is operated according to the dosage of the medicaments listed in the table 1 to obtain reverse flotation rough concentrate and reverse flotation rough tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc recovery rate of the obtained zinc concentrate is 36.25 percent and the zinc content of the obtained zinc concentrate is 12.45 percent.
Comparative example 2
The zinc content of the ore is 2.08%, the ore dressing step is consistent with that of the embodiment 1, and the reverse flotation roughing of zinc is operated according to the dosage of the medicaments listed in the table 1, so as to obtain reverse flotation rough concentrate and reverse flotation rough tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc recovery rate of the obtained zinc concentrate is 25.24 percent and the zinc content of the obtained zinc concentrate is 8.57 percent.
Comparative example 3
The zinc content of the ore is 1.95%, the ore dressing step is identical to that of the embodiment 1, and the reverse flotation roughing of zinc is operated according to the dosage of the medicaments listed in the table 1, so as to obtain reverse flotation rough concentrate and reverse flotation rough tailings; the reverse flotation rough concentrate is not added with a reagent to carry out primary concentration operation to obtain tailings; the reverse flotation rougher tailings were subjected to twice scavenging according to the dosage of the agents listed in table 1 to obtain zinc concentrate.
The zinc recovery rate of the obtained zinc concentrate is 51.58 percent and the zinc content of the obtained zinc concentrate is 4.58 percent.
Table 1 dosage of example medicament (g/ton crude ore)
。
From the above, the beneficiation method provided by the invention can effectively separate the willemite from carbonate gangue minerals by flotation through simple process flow and medicament system, effectively recover and obtain the willemite concentrate (zinc concentrate), wherein the zinc content is about 16-30%, the recovery rate is about 70-77%, the technical index is good, the purposes of energy conservation, emission reduction and comprehensive utilization of resources are achieved, and the beneficiation method is suitable for beneficiation of low-grade willemite; if the selected reagent is improper (comparative examples 1 to 3), the zinc content is low, the recovery rate is low, and the effective ore dressing of the willemite cannot be realized.
Those of ordinary skill in the art will recognize that the embodiments herein are intended to assist the reader in understanding the principles of the invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (9)
1. The beneficiation method for the willemite is characterized by comprising the following steps of:
s1: grinding willemite until mineral monomers are dissociated to obtain carbonate minerals, and adding sulfide salt into the carbonate minerals to adjust the pH value of ore pulp to be 11-12;
s2: adding modified octadecene-9-acid into the ore pulp of the S1 for reverse flotation roughing to obtain reverse flotation roughing tailings and reverse flotation roughing concentrate;
s3: the reverse flotation rougher tailings are subjected to primary concentration to obtain tailings;
s4: adding modified octadecene-9-acid into the reverse flotation rough concentrate for scavenging to obtain zinc concentrate;
the sulfide salt in the S1 is one or more of sodium sulfide, sodium hydrogen sulfide or sodium persulfate;
the modified octadecene-9-acid in S2 is prepared by the following method: placing octadecene-9-acid into a beaker, placing the beaker into a water bath kettle, controlling the temperature of the water bath kettle to be about 90 ℃, slowly dripping concentrated sulfuric acid into the beaker, and continuously stirring and reacting for 1-1.5 h to obtain a product I, wherein the mass ratio of the octadecene-9-acid to the concentrated sulfuric acid is 5:1-10:1; and (3) putting the product I into a beaker, adding NaOH, controlling the temperature to be 80-90 ℃ and the time to be 2h, and performing saponification reaction to obtain the modified octadecene-9-acid.
2. A beneficiation process according to claim 1, wherein S1 is ground using a grinding mill.
3. The beneficiation method according to claim 1, wherein the addition amount of the sulfide salt in the step S1 is 500-1500 g/t.
4. A beneficiation process according to claim 3, wherein the sulfide salt is added in S1 in an amount of 1000 g/t.
5. The beneficiation method according to claim 1, wherein the amount of the modified octadecene-9-acid in S2 is 50-150 g/t.
6. The beneficiation method according to claim 1, wherein the number of times of scavenging in the step S4 is 2, and the dosage of the modified octadecene-9-acid is 20-60 g/t during one scavenging; during secondary scavenging, the dosage of the modified octadecene-9-acid is 10-30 g/t.
7. The beneficiation process according to claim 6, wherein the amount of modified octadecene-9-oic acid used in one sweep is 40g/t; during secondary scavenging, the dosage of the modified octadecene-9-acid is 20g/t.
8. The beneficiation method according to claim 1, wherein the zinc content of the willemite ore is 1.5-2.5%.
9. The beneficiation method according to claim 1, wherein the zinc content of the zinc concentrate obtained in S4 is 16-30%.
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