Preparation method and application of low-temperature-resistant hematite reverse flotation collecting agent

Abstract

The invention aims to provide a low-temperature-resistant hematite reverse flotation collecting agent and a preparation and use method thereof in order to solve the problems of a hematite reverse flotation collecting agent in the prior art. The reverse flotation collecting agent is a mixture prepared after oleic acid, NaOH and acetamide are subjected to a heating reaction. Wherein the mixture comprises five active ingredients, namely cyanoacetamide, hexanal, nonanal, 2-heptanone and trans-2-decenol, respectively. The reverse flotation collecting agent is a mixture of amide, aldehyde, ketone and alcohol compounds containing active groups such as-NH2, C = N, C = O,-OH,-CH3 and-CH2, and has good temperature adaptability, selectivity, collecting performance, water solubility and dispersity. The method has the advantages of simple use process, easiness in operation and low preparation cost in application.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing flotation agents and relates to a preparation method and application of a low-temperature resistant hematite reverse flotation collector. Background Art

[0002] The characteristics of my country's iron ore are: few rich ores, many poor ores, complex ore types, many paragenetic ores, and high mining and beneficiation costs. With the increasing shortage of high-grade iron ore resources in my country, how to effectively and reasonably develop and utilize low-grade iron ore resources has become an important issue currently faced. Flotation, as an important means of iron ore selection, is of great significance to the efficient reuse of poor iron ore.

[0003] Hematite is an important iron ore. In the beneficiation process of hematite, its beneficiation methods mainly include positive flotation and reverse flotation. The reverse flotation process has significant advantages in improving the grade of hematite, but there are still some problems in the temperature adaptability, selectivity, capture, water solubility and dispersibility of the commonly used collectors, resulting in unsatisfactory beneficiation results. Therefore, it is of great significance to develop an efficient and selective low-temperature resistant hematite reverse flotation collector. Summary of the invention

[0004] The present invention aims to solve the problems existing in the prior art of hematite reverse flotation collectors, and provides a low-temperature resistant hematite reverse flotation collector and a preparation and use method thereof. The reverse flotation collector of the present invention is a mixture of amide, aldehyde, ketone and alcohol compounds containing active groups such as -NH2, C≡N, C=O, -OH, -CH3 and -CH2, and has good temperature adaptability, selectivity, collection, water solubility and dispersibility.

[0005] One of the technical solutions of the present invention is a low-temperature resistant hematite reverse flotation collector, which is a mixture prepared by heating reaction of oleic acid, NaOH and acetamide;

[0006] The mixture contains five active ingredients, namely: cyanoacetamide, structural formula I; hexanal, structural formula II; nonanal, structural formula III; trans-2-decenol, structural formula IV; 2-heptanone, structural formula V;

[0007] in:

[0008]

[0009] Structural Formula I;

[0010]

[0011] Structural formula Ⅱ;

[0012]

[0013] Structural formula III;

[0014]

[0015] Structural formula IV;

[0016]

[0017] Structural formula V.

[0018] Furthermore, the above-mentioned low-temperature resistant hematite reverse flotation collector contains effective active groups including but not limited to -NH2, C≡N, C=O, -OH, -CH3 and -CH2.

[0019] Furthermore, the present invention discloses a method for preparing the above-mentioned low-temperature resistant hematite reverse flotation collector, comprising the following steps:

[0020] 1) Weigh oleic acid, NaOH, acetamide and an appropriate amount of deionized water and place them in a reaction vessel, and heat them in an oil bath for reflux reaction; preferably, the mass ratio of oleic acid: NaOH: acetamide is 23-25:4-5:1; the reaction temperature is 130°C-180°C;

[0021] 2) After reacting for 20 to 30 minutes, the reaction solution is cooled to room temperature and water is added to form an aqueous solution, which is a reverse flotation collector; preferably, the mass concentration of the aqueous solution is 4 to 5% (the solute is calculated based on the total mass of oleic acid, sodium hydroxide and acetamide).

[0022] In addition, the present invention also discloses the application of the low temperature resistant hematite reverse flotation collector. The reverse flotation collector is used in the reverse flotation of hematite at a temperature range of 15 to 35°C, a pH value of 11.5±0.5, and a dosage of 700 to 800 g / t.

[0023] Furthermore, the application of the above-mentioned low-temperature resistant hematite reverse flotation collector is to grind the iron concentrate containing hematite to the required particle size, add water to adjust the slurry, then add NaOH to adjust the pH value of the slurry, and then add inhibitors and activators respectively, and finally adjust the temperature of the slurry to perform a three-sweep operation of one coarse and one fine.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] 1. The hematite reverse flotation collector of the present invention has a good flotation effect in the reverse flotation of hematite. According to the data in the embodiments / application examples, at a temperature of 25°C, the grade of the flotation iron concentrate can reach 69.89%, and the recovery rate can reach 78.09%; at a temperature of 20°C, the grade of the flotation iron concentrate can reach 68.98%, and the recovery rate can reach 77.03%; at a temperature of 15°C, the grade of the flotation iron concentrate can reach 65.38%, and the recovery rate can reach 81.31%.

[0026] 2. The hematite reverse flotation collector of the present invention has a certain collecting effect on minerals with calcium ion adsorption sites on the mineral surface.

[0027] 3. The hematite reverse flotation collector of the present invention has the advantages of simple use process, easy operation and low preparation cost in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the infrared spectrum of the low-temperature resistant hematite reverse flotation collector.

[0029] Figure 2 This is the mass spectrometry analysis of the main components in the low-temperature resistant hematite reverse flotation collector.

[0030] Among them, (a) TIC separation spectrum, (b) cyanoacetamide by mass spectrometry analysis, (c) hexanal by mass spectrometry analysis, (d) 2-heptanone by mass spectrometry analysis, (e) nonanal by mass spectrometry analysis, and (f) trans-2-decenol by mass spectrometry analysis.

[0031] Figure 3 This is the flotation process flow chart of low-temperature resistant hematite reverse flotation collector mixed with magnetic concentrate. DETAILED DESCRIPTION

[0032] The preparation method of the low temperature resistant hematite reverse flotation collector of the present invention is:

[0033] Oleic acid: sodium hydroxide: acetamide are weighed in a mass ratio of 23-25: 4-5: 1, placed in a reaction container, and then an appropriate amount of deionized water is added. Under the temperature condition of 130°C-180°C in an oil bath, reflux reaction is carried out for 20-30 minutes. Then the reaction solution is cooled to room temperature, and water is added to prepare an aqueous solution with a mass concentration of 4-5% (the solute is calculated based on the total mass of oleic acid, sodium hydroxide and acetamide), which is a reverse flotation collector.

[0034] Example 1

[0035] The preparation method of the reverse flotation collector used in the following examples is:

[0036] Oleic acid: sodium hydroxide: acetamide are weighed in a mass ratio of 25:5:1, placed in a reaction container, and then an appropriate amount of deionized water is added. The reaction is refluxed in an oil bath at 150°C for 30 minutes, and then the reaction solution is cooled to room temperature, and water is added to prepare a 5% aqueous solution (the solute is calculated based on the total mass of oleic acid, sodium hydroxide and acetamide), which is a reverse flotation collector. The main groups and main components of the collector of this embodiment are shown in Figure 1 and Figure 2 .

[0037] Example 2

[0038] Flotation test of a mixed magnetic concentrate in Anshan at different temperatures:

[0039] Take a mixed magnetic concentrate from Anshan with a grade of 47.24%. See the attached flotation process flow chart. Figure 3 The mixed magnetic concentrate was ground to a particle size of -0.074 mm (accounting for more than 85%), water was added to adjust the pulp to a pulp concentration of 25%, NaOH was added to a pH value of 11.5, the pulp was adjusted for 3 minutes, 700 g / t of 2.5% starch solution was added to adjust the pulp for 3 minutes, 400 g / t of 2.5% CaO solution was added to adjust the pulp for 3 minutes, 750 g / t of 5% collector of Example 1 was added to adjust the pulp for 3 minutes, and three sweeping operations of one coarse and one fine were carried out at 25°C, 20°C, and 15°C. The flotation results of the reverse flotation collector MY of Example 1 at 25°C are shown in Table 1, the flotation results of MY at 20°C are shown in Table 2, and the flotation results of MY at 15°C are shown in Table 3; the flotation results of oleic acid at 25°C are shown in Table 4.

[0040] Table 1 Flotation results of MY collector at flotation temperature of 25°C

[0041]

[0042] Table 2 Flotation results of MY collector at flotation temperature of 20°C

[0043]

[0044]

[0045] Table 3 Flotation results of MY collector at flotation temperature of 15°C

[0046]

[0047] Table 4 Flotation results of oleic acid collector at flotation temperature of 25°C

[0048]

[0049] It can be seen from Table 1, Table 2 and Table 3 that the flotation performance of the MY collector prepared by the present invention is better than that of the oleic acid collector commonly used in hematite reverse flotation. Under the temperature condition of 25°C, the grade of the flotation iron concentrate can reach 69.89% and the recovery rate can reach 78.09%; under the temperature condition of 20°C, the grade of the flotation iron concentrate can reach 68.98% and the recovery rate can reach 77.03%; under the temperature condition of 15°C, the grade of the flotation iron concentrate can reach 65.38% and the recovery rate can reach 81.31%. It is shown that the low-temperature resistant hematite reverse flotation collector of the present invention can be used for low-temperature flotation of hematite.

[0050] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A low temperature resistant hematite reverse flotation collector, characterized in that: It is a mixture obtained by heating reaction of oleic acid, NaOH and acetamide; The mixture contains five active ingredients, namely cyanoacetamide, hexanal, nonanal, 2-heptanone and trans-2-decenol.

2. The low temperature resistant hematite reverse flotation collector according to claim 1, characterized in that: The effective reactive groups contained include, but are not limited to, -NH2, C≡N, C=O, -OH, -CH3 and -CH2.

3. The method for preparing the low temperature resistant hematite reverse flotation collector according to claim 1, characterized in that: The steps include: 1) Weigh oleic acid, NaOH, acetamide and an appropriate amount of deionized water into a reaction vessel, and heat in an oil bath for reflux reaction; 2) After reacting for 20 to 30 minutes, the reaction solution is cooled to room temperature and water is added to form an aqueous solution, which is the reverse flotation collector.

4. The method for preparing the low temperature resistant hematite reverse flotation collector according to claim 3, characterized in that: The mass ratio of oleic acid: NaOH: acetamide is 23-25:4-5:1; the reaction temperature is 130°C-180°C.

5. The method for preparing the low temperature resistant hematite reverse flotation collector according to claim 3, characterized in that: The mass concentration of the aqueous solution is 4-5%.

6. The use of the low temperature resistant hematite reverse flotation collector according to claim 1, characterized in that: The reverse flotation collector is used in the reverse flotation of hematite at a temperature range of 15 to 35°C, a pH value of 11.5±0.5, and a dosage of 700 to 800 g / t.

7. The use of the low temperature resistant hematite reverse flotation collector according to claim 6, characterized in that: The iron concentrate containing hematite is ground to the required particle size, water is added to adjust the slurry, and then NaOH is added to adjust the pH value of the slurry. Then, inhibitors and activators are added respectively, and finally the temperature of the slurry is adjusted to perform a three-sweep operation of one coarse and one fine.

Images