CN109865600B - Method for preferentially floating lead in lead-zinc sulfide ore flotation by using mixed collecting agent - Google Patents
Method for preferentially floating lead in lead-zinc sulfide ore flotation by using mixed collecting agent Download PDFInfo
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Abstract
A method of using a mixed collector to preferentially float lead in the flotation of lead zinc sulphide ores, comprising the steps of: the method comprises the steps of firstly, finely grinding raw ores, then, sequentially adding a regulator, an inhibitor and a mixed collector for size mixing, wherein the mixed collector is formed by mixing ethionine, butyl xanthate and benzohydroxamic acid and is used as a collector, the mixed collector is prepared into a collector mixture according to a certain proportion and is used or is respectively used in the flotation process, and finally, lead flotation is carried out. The invention effectively solves the problem that the original ore containing partially weathered lead oxide ore is difficult to effectively recover by the sulfide ore collecting agent in the lead-zinc sulfide ore flotation process, and can effectively improve the recovery rate of lead in lead concentrate.
Description
Technical Field
The invention relates to the technical field of mineral separation. In particular to a method for preferentially floating lead in lead-zinc sulfide ore flotation by using a mixed collecting agent.
Background
Lead-zinc ore resources in China are rich, but the ore types are complex, associated components are more, and the comprehensive utilization value is higher; the lead-zinc ore deposit is mainly sulfide ore, but does not lack large lead-zinc oxide ore deposit, the lead-zinc ratio is mainly zinc, single lead ore deposit is less, and the distribution rule of more lean ore and less rich ore is presented overall. Although the lead-zinc sulfide ore deposit mainly contains sulfide ore, due to geological mineralization, surface weathering and other reasons, a mixed ore vein formed by symbiotic sulfide ore and oxide ore often appears, and the difficulty is brought to the separation and recovery of lead and zinc.
The method for sorting lead-zinc ores in China mainly adopts flotation as a main part, the difference of the embedded granularity and the co-associated components of ores directly influences the sorting process and the chemical system of the flotation process, but the sorting of most ores follows a general sorting principle process, namely 'preferentially floating lead and then sorting zinc', mainly because the proportion of general zinc in lead-zinc sulfide ores is higher than that of lead, the floatability of the lead-zinc sulfide ores (generally mainly containing lead ores) is higher than that of the zinc sulfide ores, generally mainly containing zinc blende and zinc ferroblende, and lead is preferentially floated through a simple chemical system to obtain lead concentrate with higher lead content, and then zinc and other associated elements are recovered from lead flotation tailings. Researchers have made many research achievements in various aspects such as collecting agent, inhibitor, foaming agent, process flow and the like of lead-zinc sulfide ore flotation.
The publications on collectors for lead-zinc sulfide ore flotation are: chinese patent publication No. CN107138285A discloses a lead sulfide and zinc ore flotation combined collector and a method for using the same, chinese patent publication No. CN107252735A discloses a sulfide ore flotation composite collector and a preparation method and application thereof, chinese patent publication No. CN104475267A discloses a galena collector and a preparation method thereof, and the publication documents in the aspect of an inhibitor for lead sulfide and zinc ore flotation are as follows: chinese patent publication No. CN103817013A discloses a lead-zinc ore flotation inhibitor composition and a lead-zinc ore flotation method, chinese patent publication No. CN101138749 discloses an inhibitor used in lead flotation, and the publications in terms of a foaming agent for lead-zinc sulfide flotation include: chinese patent publication No. CN106944247A discloses a flotation collecting foaming agent and a preparation method thereof, and the published documents in the technical process of lead-zinc sulfide ore flotation include: chinese patent publication No. CN104084313A discloses a beneficiation method of low-grade lead-zinc sulfide ore, and chinese patent publication No. CN101417266 discloses a new flotation process of lead-zinc sulfide ore. It is worth noting that there are two factors that have a large influence on the flotation effect in the difference of ore properties of lead-zinc sulfide ore, one is the content of carbonaceous matter in raw ore, and the other is the content of oxidized ore or weathered ore. The key point for solving the two influencing factors lies in the selection and use of a collecting agent, for example, Chinese patent publication No. CN101138750 discloses a lead flotation process of lead-zinc sulphide ore with high carbon content, a method of adding butyl xanthate is adopted in the lead flotation process to prevent the groove sinking phenomenon caused by high carbon content and improve the lead yield, Chinese patent publication No. CN105797868A discloses a beneficiation method for recovering low-grade zinc oxide ore from lead-zinc ore flotation tailings, and a method for desliming sulphide ore or independently treating oxidized weathered ore is provided to recover lead and zinc; chinese patent publication No. CN105797868A discloses a beneficiation method for recovering low-grade zinc oxide ore from lead-zinc ore flotation tailings, or develops a novel collector or uses a combined collector, for example, chinese patent publication No. CN104907181A discloses a collector for grading lead ore and a preparation method thereof, for example, chinese patent publication No. CN1704170 discloses a sulfidization-oxidation mixed lead-zinc ore flotation method, to enhance the yield of oxidized weathered ore in sulfide ore. However, these methods are mostly used in high alkali environment, and need to be matched with high-dosage quicklime, and the problems of lime in pipelines and the like are often encountered in the production process.
Therefore, the invention provides a mixed collecting agent suitable for being used in a low-alkali environment aiming at the problem that lead-zinc sulfide ore contains carbon, oxidized ore and weathered ore in higher proportion, and the recovery index of lead can be obviously improved.
Disclosure of Invention
The invention aims to provide a method for preferentially floating lead in lead-zinc sulfide ore flotation by using a mixed collecting agent, which can obtain higher lead sorting index under the condition of large carbon and oxidized weathered ore occupation ratio in a low-alkali environment and does not influence the recovery of zinc. Compared with the prior art, the separation process can directly recover the lead sulfide ore and the lead oxide ore through flotation without decarbonization, desliming or separate treatment of the lead oxide ore, so that the loss of lead in the lead oxide ore is avoided, and the recovery rate of lead is improved.
The invention achieves the above purpose by the following technical scheme: a method for preferentially floating lead in the flotation of lead-zinc sulfide ores by using a mixed collecting agent comprises the following steps:
(1) grinding raw ore to-0.074 mm +0.010mm,
(2) adding a regulator, an inhibitor and a mixed collector for size mixing,
(3) then flotation is carried out, the foam product is lead rough concentrate or lead concentrate after multiple concentration, the product in the cell is tailings,
the mixed collecting agent is prepared by mixing the following components in percentage by weight: butyl xanthate is 5: 1-1: 1, the sodium benzoate is prepared by mixing the sodium benzoate and 20-100 g/ton of benzohydroxamic acid, the total amount is 100-300 g/ton, the dosage of the regulator is 500-1500 g/ton of sodium carbonate and 200-2000 g/ton of lime, the pH is adjusted to 10, and the inhibitor is 200-2000 g/ton of zinc sulfate and 100-500 g/ton of sodium sulfite.
The mixed collecting agent is characterized in that butyl xanthate, ethidium bromide and benzohydroxamic acid are used as collecting agents in a mixed mode according to the difference of raw ore compositions, benzohydroxamic acid in the mixed collecting agent is a main collecting agent of lead oxide ore, ethidium bromide and butyl xanthate are collecting agents of lead sulfide ore and are used directly in the flotation process, or ethidium bromide, butyl xanthate and benzohydroxamic acid are added in the flotation process respectively.
The dosage of the benzohydroxamic acid in the mixed collector is 20-100 g/ton.
The ore pulp of the selected lead-zinc sulfide ore is the ore pulp obtained after grinding of the raw ore, desliming and decarburizing are not needed, a regulator, an inhibitor and a collecting agent are sequentially added at a proper chemical adding point, and the control of the flotation pH to be 8-10 is the key for ensuring the higher collecting effect of the benzohydroxamic acid on the lead oxide ore, wherein the benzohydroxamic acid, the butyl xanthate and the ethidene nitrogen can be simultaneously added in lead flotation roughing and can also be added in lead flotation scavenging.
The invention has the outstanding advantages that:
compared with the method without adding the benzohydroxamic acid, the method has the advantages that the benzohydroxamic acid is used in the collecting agent, so that the recovery rate of lead in lead rough concentrate can be improved by 2-8% on the premise of not influencing the zinc flotation recovery, the effect of the benzohydroxamic acid is influenced by the proportion of lead oxide ore in raw ore, the mixed flotation of lead sulfide and lead oxide is realized, and the lead loss caused by desliming (removal of oxidized weathered ore) and the cost increased by independently treating the oxidized weathered ore are avoided.
Butyl xanthate and ethionine are used in the collecting agent, so that the method has a good sorting effect on lead-zinc sulfide ores with high carbon content, the lead-zinc loss caused by decarbonization can be avoided, and the use amount of lime can be reduced in a low-alkali environment with the flotation pH of 8-10.
The method has simple process, is convenient for industrial production operation, can effectively reduce the cost of the medicament, improves the recovery rate of lead, does not influence the recovery of zinc, and thus improves the utilization rate of lead and zinc resources.
Drawings
Fig. 1 is a flow chart of lead flotation roughing test of the ore dressing method for preferentially floating lead by using a mixed collector in lead-zinc sulfide ore flotation.
Fig. 2 is a flow chart of a closed circuit test of the beneficiation process using a mixed collector to preferentially float lead in the flotation of lead-zinc sulfide ore according to the present invention.
Detailed Description
The following examples are given to further illustrate the technical solutions of the present invention, but not to limit the present invention.
Example 1
The ore sample is a raw ore sample of lead-zinc sulfide ore of Nemeng, wherein the proportion of oxidized weathered ore is up to 30%, after grinding to-0.074 mm size fraction accounting for 85%, 6000 g/ton of quicklime, 400 g/ton of inhibitor zinc sulfate and 400 g/ton of sodium sulfide are adopted for crude lead roughing, the dosage of butylammonium black is 100 g/ton as a collecting agent, 50 g/ton of ethidene nitrogen, 50 g/ton of butyl xanthate and 50 g/ton of benzohydroxamic acid are adopted as a mixed collecting agent to replace the original collecting agent, the dosage of quicklime is reduced to 3000 g/ton, other conditions are the same, and the comparison of flotation test results is respectively carried out and is shown in the following table:
the result shows that the mixed collecting agent is adopted, so that the lead grade of the rough concentrate is improved, and the tungsten recovery rate of the rough concentrate is improved by about 5 percent.
Example 2
The ore sample is a certain lead-zinc sulfide ore raw ore sample in Yunnan, the carbon content is about 1 percent, the proportion of oxidized ore is about 15 percent, the original flotation process is that the lead flotation is carried out by one roughing, three scavenging and two concentration priority lead flotation, 2500 g/ton lime is used for roughing, 800 g/ton zinc sulfate, 800 g/ton sodium sulfite, 45 g/ton 25# black drug and 50 g/ton butyl xanthate, 80 g/ton raw ore benzohydroxamic acid is added in the scavenging section of the lead flotation under the premise of not changing the original medicament system and process flow, and the results of closed circuit flotation tests are compared as shown in the following table:
the result shows that the recovery rate of lead in lead concentrate is remarkably improved by about 7 percent by adopting the mixed collecting agent added with the benzohydroxamic acid.
Example 3
The ore sample is a raw ore sample of lead-zinc-copper sulfide ore containing 1.18% of carbon, the original process adopts a decarburization process, firstly 200 g/ton of zinc sulfate, 200 g/ton of sodium sulfite and 30 g/ton of ethion are used for carbon flotation, then 6500 g/ton of lime, 1200 g/ton of zinc sulfate, 1200 g/ton of sodium sulfite and 200 g/ton of ethion are used for lead flotation from decarburization tailings, the original collecting agent is replaced by 120 g/ton of ethion, 80 g/ton of butyl xanthate and 20 g/ton of phenylhydroxamic acid, decarburization operation is removed, lead flotation is directly preferentially carried out, other conditions are the same, and the flotation test results are shown in the following comparison table:
the results show that the original pesticide system and the decarburization operation lose about 4% of lead recovery rate in the removed carbon, and the mixed collecting agent is adopted to remove the decarburization operation, so that the lead recovery rate of lead concentrate is improved by about 7%.
Example 4
The ore sample is a weathered sample of a low-grade lead-zinc polymetallic sulphide ore in Xinjiang, the weathered ore accounts for about 35 percent, the primary flow adopts one-time roughing, three-time concentration and two-time scavenging, 50 g/ton of ammonium butoxide and 100 g/ton of ethyl sulfur nitrogen are used as mixed collecting agents in the roughing, the using amount of lime is 6000 g/ton, 200 g/ton of zinc sulfate, 200 g/ton of sodium sulfite and 250 g/ton of sodium sulfide, collecting agents are not added in the concentrating, the using amount of inhibitors is reduced by half step by step, inhibitors are not added in the scavenging, and the using amount of collecting agents is reduced by half step by step. The original flow collecting agent is replaced by mixed usage of 80 g/ton of ethidium and sulfur, 15 g/ton of butyl xanthate and 60 g/ton of benzohydroxamic acid, other conditions are the same, and the results of flotation tests are compared as shown in the following table:
the result shows that the grade and the recovery rate of the lead concentrate are improved by about 8% by adopting the mixed collecting agent, and the lead separation effect is obvious.
Claims (2)
1. A method for preferentially floating lead in lead-zinc sulfide ore flotation by using a mixed collecting agent is characterized by comprising the following steps:
(1) grinding raw ore to-0.074 mm +0.010mm,
(2) adding a regulator, an inhibitor and a mixed collector for size mixing,
(3) then flotation is carried out, the foam product is lead rough concentrate or lead concentrate after multiple concentration, the product in the cell is tailings,
the mixed collecting agent is prepared by mixing the following components in percentage by weight: butyl xanthate = 5: 1-1: 1 is prepared by mixing the raw materials with 20 to 100 g/ton of benzohydroxamic acid, the total amount is 100 to 300 g/ton, the dosage of the regulator is 500 to 1500 g/ton of sodium carbonate and 200 to 2000 g/ton of lime, the pH is adjusted to 10, the inhibitor is 200 to 2000 g/ton of zinc sulfate and 100 to 500 g/ton of sodium sulfite,
the mixed collecting agent is prepared by taking butyl xanthate, ethidium bromide and benzohydroxamic acid as collecting agents according to the difference of raw ore compositions, the benzohydroxamic acid in the mixed collecting agent is the main collecting agent of lead oxide ore, the ethidium bromide and the butyl xanthate are collecting agents of lead sulfide ore and are directly used in the flotation process, or the ethidium bromide, the butyl xanthate and the benzohydroxamic acid are respectively added in the flotation process,
the ore pulp of the selected lead-zinc sulfide ore is the ore pulp obtained after grinding of the raw ore, desliming and decarburizing are not needed, a regulator, an inhibitor and a collecting agent are sequentially added at a proper chemical adding point, and the control of the flotation pH to be 8-10 is the key for ensuring the higher collecting effect of the benzohydroxamic acid on the lead oxide ore, wherein the benzohydroxamic acid, the butyl xanthate and the ethidene nitrogen can be simultaneously added in lead flotation roughing and can also be added in lead flotation scavenging.
2. The method for preferentially floating lead in the flotation of lead-zinc sulfide ore according to claim 1, wherein the dosage of benzohydroxamic acid in the mixed collector is 20-100 g/ton.
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| EP0615467B1 (en) * | 1991-11-27 | 1995-08-23 | Consiglio Nazionale Delle Ricerche | 2-mercapto-benzoxazole derivatives as collectors for the selective flotation of metal ores |
| CN105689150A (en) * | 2016-04-15 | 2016-06-22 | 中南大学 | Lead-zinc oxide ore flotation inhibitor and application thereof |
| CN108405191A (en) * | 2018-02-11 | 2018-08-17 | 广西华洋矿源材料有限公司 | A kind of choosing method of lead-zinc sulfide ore |
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| CN107497607B (en) * | 2017-08-17 | 2019-06-21 | 北京矿冶研究总院 | Flotation method for micro-fine particle cassiterite |
| CN108380395B (en) * | 2018-02-28 | 2020-03-17 | 湘潭大学 | Lead-thallium separation method for thallium-containing lead sulfide concentrate |
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| EP0615467B1 (en) * | 1991-11-27 | 1995-08-23 | Consiglio Nazionale Delle Ricerche | 2-mercapto-benzoxazole derivatives as collectors for the selective flotation of metal ores |
| CN105689150A (en) * | 2016-04-15 | 2016-06-22 | 中南大学 | Lead-zinc oxide ore flotation inhibitor and application thereof |
| CN108405191A (en) * | 2018-02-11 | 2018-08-17 | 广西华洋矿源材料有限公司 | A kind of choosing method of lead-zinc sulfide ore |
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