A method for preparing zinc oxide ore flotation agent

Abstract

The present invention discloses a method for preparing a zinc oxide ore flotation agent, comprising the following steps: S1, mixing dodecylamine with oleic acid and stearic acid in a weight ratio of 1-2:3-4:1-2, and heating to 70-75°C to obtain a mixed solution; S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, wherein the mass of the mixture is 7-13% of the mass of the mixed solution; S3, mixing the mixture with the mixed solution, cooling to 40-45°C and stirring at a constant temperature for 24-48 hours to obtain a collector. The collector of the present invention can effectively improve the flotation recovery rate of zinc concentrate and reduce the grade of zinc in tailings.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral flotation, and in particular relates to a method for preparing a zinc oxide ore flotation agent. Background Art

[0002] Zinc exists naturally in the form of sulfide minerals and oxide minerals. In sulfide ores, zinc primarily exists as sphalerite, while in oxide ores, it primarily exists as smithsonite and hemimorphite. However, my country's zinc ore resources are characterized by a lack of rich ores and a diverse range of types, as well as a limited number of large mines and a high number of small and medium-sized mines. Although zinc sulfide ore is the predominant raw material used in modern zinc smelting, the increasing depletion of zinc sulfide ore resources has put the processing and utilization of zinc oxide ore on the agenda. my country possesses abundant reserves of zinc oxide ore. According to statistics, the proven reserves of zinc oxide ore reach 80 million tons, primarily distributed in Yunnan, Guizhou, and Gansu provinces, with Yunnan Province alone containing approximately 7.1 million tons. Zinc oxide is a secondary mineral of zinc, which mainly exists in the forms of smithsonite (ZnCO3), hemimorphite [Zn4Si2O7(OH)2·H2O], willemite (Zn2SiO4), hydrozincite [Zn5(CO3)2(OH)6], and zincite (ZnO). The gangue minerals are mainly calcite, dolomite, quartz, clay, iron oxide and iron hydroxide.

[0003] At present, the main beneficiation method of zinc oxide ore is flotation, which mainly includes sulfide-amine salt flotation, sulfide-xanthate flotation, fatty acid collector flotation, flocculation flotation and combined flotation. However, these methods have their own disadvantages. For example, the sulfide-amine salt flotation method is easily affected by ore slime and salt minerals, and is not suitable for processing ores containing a large amount of mica, sericite, chlorite, and carbonaceous shale; the sulfide-xanthate flotation method has unsatisfactory flotation indicators for zinc silicate minerals and ores with high iron oxide content. At the same time, heating and activation are required during the flotation process, and the dosage of sulfide reagents needs to be strictly controlled; fatty acid direct flotation method is not suitable for processing zinc oxide ores with high iron content and carbonate gangue; the key to the flocculation flotation method is to select a reagent with a specific flocculation effect for the zinc oxide ore.

[0004] The reagents used in the flotation process of zinc oxide ore generally include regulators, flocculants, frothers and collectors. Among them, the collector is the key reagent in flotation. The collection effect of the collector directly affects the recovery rate of zinc oxide ore. How to prepare the collector for zinc oxide ore has always been a concern of the mineral processing industry at home and abroad. Summary of the Invention

[0005] In order to overcome the problems existing in the background technology, the present invention provides a method for preparing a zinc oxide ore flotation agent.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for preparing a zinc oxide ore flotation agent comprises the following steps:

[0008] S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 1-2:3-4:1-2, and heating to 70-75° C. to obtain a mixed solution;

[0009] S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 7-13% of the mass of the mixed solution;

[0010] S3, mixing the mixture with the mixed liquid, cooling it to 40-45°C and stirring it at a constant temperature for 24-48 hours to obtain a collector.

[0011] Furthermore, in the step S1, the weight ratio of dodecylamine to oleic acid and stearic acid is 2:3:2.

[0012] Furthermore, in the step S3, the stirring speed is 200-250 r / min.

[0013] Beneficial effects of the present invention: The collector of the present invention can effectively improve the flotation recovery rate of zinc concentrate and reduce the grade of zinc in tailings. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below to facilitate understanding by technicians.

[0015] Example 1, a method for preparing a zinc oxide ore flotation agent, comprising the following steps:

[0016] S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 1:3:1 and heating to 70° C. to obtain a mixed solution;

[0017] S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 7% of the mass of the mixed solution;

[0018] S3, mixing the mixture with the mixed liquid, cooling it to a constant temperature of 40°C, and stirring it at a speed of 200 r / min for 24 hours to obtain a collector.

[0019] Example 2, a method for preparing a zinc oxide ore flotation agent, comprising the following steps:

[0020] S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 2:4:2 and heating to 75° C. to obtain a mixed solution;

[0021] S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 13% of the mass of the mixed solution;

[0022] S3, mixing the mixture with the mixed liquid, cooling to a constant temperature of 45°C, and stirring at a speed of 250 r / min for 48 hours to obtain a collector.

[0023] Example 3, a method for preparing a zinc oxide ore flotation agent, comprising the following steps:

[0024] S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 2:3:2 and heating to 73° C. to obtain a mixed solution;

[0025] S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 10% of the mass of the mixed solution;

[0026] S3, mixing the mixture with the mixed liquid, cooling to a constant temperature of 42°C, and stirring at a speed of 220 r / min for 36 hours to obtain a collector.

[0027] Example 4, a method for preparing a zinc oxide ore flotation agent, comprising the following steps:

[0028] S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 1.5:3.5:1.5, and heating to 75° C. to obtain a mixed solution;

[0029] S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 10% of the mass of the mixed solution;

[0030] S3, after mixing the mixture with the mixed liquid, cool it to a constant temperature of 45°C, and stir it at a speed of 250 r / min for 48 hours to obtain the collector.

[0031] Example 5,

[0032] This example uses a zinc oxide ore from Simao, Yunnan Province, as an example. This ore contains 9.64% zinc, with an oxidation rate greater than 99%. The main zinc-containing minerals are hemimorphite and smithsonite, with smaller amounts of hydrozincite, hematite, and cerussite. The gangue minerals, sericite and kaolin, are relatively high. The ore's overall structure is loose and brittle, and it is prone to producing secondary slime. The collectors prepared in Examples 1 to 4 (900 g of collector added per ton of ore) and existing collectors were used to flotate the raw ore powder. The flotation process was identical except for the addition of the flotation agent. The flotation results are shown in the following table:

[0033] Collector product Yield (%) Zinc grade (%) Zinc recovery rate (%) Example 1 zinc concentrate 41.22 22.48 86.49 Example 2 zinc concentrate 40.98 23.05 87.52 Example 3 zinc concentrate 41.01 23.15 86.77 Example 4 zinc concentrate 41.59 21.47 86.51 Existing collectors zinc concentrate 39.77 17.29 81.32

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for preparing a zinc oxide ore flotation agent, characterized in that: The following steps are involved: S1, mixing dodecylamine, oleic acid, and stearic acid in a weight ratio of 1-2:3-4:1-2, and heating to 70-75° C. to obtain a mixed solution; S2, then adding a mixture of methanol and ethylene glycol in a volume ratio of 1:2 to the mixed solution, the mass of the mixture being 7-13% of the mass of the mixed solution; S3, mixing the mixture with the mixed liquid, cooling it to 40-45°C and stirring it at a constant temperature for 24-48 hours to obtain a collector.

2. The method for preparing a zinc oxide ore flotation agent according to claim 1, wherein: In the step S1, the weight ratio of dodecylamine to oleic acid and stearic acid is 2:3:

2.

3. The method for preparing a zinc oxide ore flotation agent according to claim 1, wherein: In the step S3, the stirring speed is 200-250 r / min.