Magnesite collecting agent, magnesite desilicication purification method and magnesite concentrate

Abstract

The invention provides a magnesite collecting agent, a magnesite desiliconization purification method and magnesite concentrate, and relates to the technical field of magnesite desiliconization purification processes. The magnesite collecting agent comprises the following components in parts by mass: 5-6 parts of fatty alcohol polyoxyethylene ether phosphate and 1-2 parts of fatty acid salt. The magnesite collecting agent can obtain a good magnesite purification effect.

Description

Technical Field

[0001] The invention relates to the technical field of magnesite desiliconization and purification technology, and in particular to a magnesite collector, a magnesite desiliconization and purification method, and a magnesite concentrate. Background Art

[0002] Magnesite is an important non-metallic mineral. Due to its good refractoriness and adhesion, it is widely used in fireproof materials, chemicals, building materials and other fields.

[0003] However, with the continuous development of my country's economy, the domestic reserves of high-grade magnesite have decreased sharply. Therefore, how to purify low-grade magnesite to obtain higher-purity magnesite concentrate has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a magnesite collector, a magnesite desiliconization and purification method, and a magnesite concentrate, which solves the technical problem that the magnesite concentrate obtained by the existing magnesite purification process has low purity.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] In a first aspect, the present invention provides a magnesite collector, comprising the following components in parts by weight: 5-6 parts of fatty alcohol polyoxyethylene ether phosphate and 1-2 parts of fatty acid salt.

[0009] The above-mentioned magnesite collector includes fatty alcohol polyoxyethylene ether phosphate and fatty acid salt. The fatty alcohol polyoxyethylene ether phosphate chemically adsorbs on the magnesium site on the surface of magnesite, thereby achieving the purpose of efficient positive flotation desiliconization of magnesite and greatly improving the foam phenomenon of the foam, reducing the foam half-life and improving the foam annealing ability. In addition, the fatty acid salt can make the surface of the magnesite mineral particles hydrophobic, making the magnesite mineral particles more easily attached to the bubbles, thereby enhancing the floatability of the magnesite. The fatty acid salt and the fatty alcohol polyoxyethylene ether phosphate synergistically act on the surface of the magnesite, thereby obtaining a good magnesite purification effect.

[0010] Preferably, the fatty acid salt is selected from one of capric acid, sodium linoleate, sodium linolenate and sodium laurate.

[0011] In a second aspect, the present invention provides a method for desiliconization and purification of magnesite, comprising the following steps:

[0012] (1) Ore pre-treatment: The raw ore is crushed and ground to a grinding fineness of -0.074 mm accounting for 78%-82% to obtain the treated ore;

[0013] (2) Positive flotation enrichment: providing treated ore, adding water to slurry, stirring thoroughly, adding a regulator and stirring, then adding the collector described in the first aspect and stirring, aerating flotation, the obtained foam product is a rough concentrate of magnesite, and the obtained precipitate is quartz;

[0014] The coarse concentrate of magnesite is added with water to prepare a slurry, and then subjected to a positive flotation separation, and the obtained precipitate is the magnesite middlings, and the foam product is the magnesite concentrate.

[0015] The above-mentioned desiliconization and purification method of magnesite selects a regulator and a collector, firstly adds the regulator to inhibit quartz, and then adds a collector system composed of fatty alcohol polyoxyethylene ether phosphate and fatty acid salt, and the fatty alcohol polyoxyethylene ether phosphate chemically adsorbs to the magnesium site on the surface of the magnesite, thereby achieving the purpose of efficient positive flotation desiliconization of the magnesite, and greatly improving the foam phenomenon of the foam, reducing the foam half-life and improving the foam annealing ability. In addition, the fatty acid salt can make the surface of the magnesite mineral particles hydrophobic, making the magnesite mineral particles more easily attached to the bubbles, thereby enhancing the floatability of the magnesite, and the fatty acid salt and the fatty alcohol polyoxyethylene ether phosphate synergistically act on the surface of the magnesite, thereby obtaining a good magnesite purification effect.

[0016] Preferably, the adjusting agent is selected from any one of carboxymethyl cellulose (CMC), water glass, and sodium hexametaphosphate. CMC, water glass, and sodium hexametaphosphate combined with fatty alcohol polyoxyethylene ether phosphate and fatty acid salt can reduce the floatability of quartz, thereby improving the grade of magnesite concentrate.

[0017] Preferably, the dosage of the adjusting agent is 125g / t-200g / t. If the dosage of the adjusting agent is too large, the flotation property of some magnesite particles will be reduced, thereby reducing the recovery rate of the magnesite concentrate. If the dosage is too small, some quartz will float up, thereby reducing the grade of the magnesite concentrate.

[0018] Preferably, the dosage of the collector is 145g / t-180g / t. If the dosage of the collector exceeds this range, quartz and other gangue minerals will float up, reducing the grade of the magnesite concentrate. If the dosage is lower than this range, magnesite will be lost in the tailings, thereby reducing the recovery rate of the magnesite concentrate.

[0019] In a third aspect, the present invention provides a magnesite concentrate, wherein the magnesite concentrate is purified by the method described in the second aspect.

[0020] Preferably, the MgO grade of the magnesite concentrate is 46.22%-47.55%.

[0021] Preferably, the MgO recovery rate of the magnesite concentrate is 76.43%-86.55%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a flow chart of the desiliconization and purification method of magnesite in Example 1. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The embodiments of the present application solve the technical problem that the purity of the magnesite concentrate obtained by the existing magnesite purification process is low by providing a magnesite collector, a magnesite desiliconization and purification method, and a magnesite concentrate.

[0026] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0027] The present invention provides a method for realizing positive flotation desiliconization of magnesite by synergistic action of a regulator, fatty alcohol polyoxyethylene ether phosphate and fatty acid salt. The process provided by the present invention has a better desiliconization effect and significantly improves the flotation foam phenomenon.

[0028] The preparation method of the magnesite collector of the present application is carried out according to the following process and steps:

[0029] 1) 5-6 parts of fatty alcohol polyoxyethylene ether phosphate and 1-2 parts of fatty acid salt are uniformly mixed to obtain a mixture, and the mixture is completely dissolved in water at a mass ratio of 1:1 to obtain a collector for magnesite flotation. When used, the collector can be prepared into a 5wt% aqueous solution.

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] A magnesite in Haicheng, Liaoning Province was used as the ore sample, and its chemical composition is shown in Table 1.

[0033] Table 1 Chemical composition of a magnesite

[0034]

[0035] This embodiment provides a method for desiliconization and purification of the above-mentioned magnesite, such as Figure 1 As shown, the following steps are included:

[0036] (1) Ore pre-treatment: The raw ore is crushed and ground to a grinding fineness of -0.074 mm accounting for 78% to obtain the processed ore.

[0037] (2) Positive flotation enrichment: Add 500g of treated ore to the flotation tank, add a certain amount of tap water to mix the slurry, and fully stir to obtain ore slurry. Add CMC to the ore slurry, and the amount of CMC added is 200g / t (i.e., 200gCMC is added to 1 ton of ore slurry. The amount of other materials in the embodiment also refers to the amount added to 1 ton of ore slurry), and stir for 3 minutes. Then add 120g / t of fatty alcohol polyoxyethylene ether phosphate and 25g / t of capric acid, and stir for 4 minutes. Aeration flotation is performed, and the obtained foam product is a rough concentrate of magnesite, and the flotation tank contains quartz.

[0038] After the coarse concentrate of magnesite is placed in the flotation tank, a certain amount of tap water is added to make the slurry, and a positive flotation is carried out. The product in the tank is the magnesite middlings, and the foam product is the magnesite concentrate.

[0039] Through the one-rough-one-fine flotation desiliconization process, after flotation of a magnesite mine in Haicheng, Liaoning Province, a magnesite concentrate with a MgO grade and recovery rate of 47.55% and 86.55% was finally obtained. The separation index is good and the purity of the magnesite concentrate is high.

[0040] Example 2

[0041] A magnesite mine in Haicheng, Liaoning Province was used as the ore sample, and its chemical composition is shown in Table 2.

[0042] Table 2 Chemical composition of a magnesite

[0043]

[0044] This embodiment provides a method for desiliconization and purification of the above-mentioned magnesite, comprising the following steps:

[0045] (1) Ore pre-treatment: The raw ore is crushed and ground to a grinding fineness of -0.074 mm, accounting for 82%, to obtain the processed ore.

[0046] (2) Positive flotation enrichment: Add 500g of treated ore to the flotation tank, add a certain amount of tap water to slurry, stir thoroughly, add 125g / t CMC and stir for 3min. Then add 150g / t fatty alcohol polyoxyethylene ether phosphate and 30g / t sodium linoleate and stir for 4min. Aerate flotation, the obtained foam product is magnesite coarse concentrate, and the flotation tank contains quartz.

[0047] After the coarse concentrate of magnesite is placed in the flotation tank, a certain amount of tap water is added to the slurry for a positive flotation separation. The product in the tank is the magnesite middlings, and the foam product is the magnesite concentrate.

[0048] Through the one-rough-one-fine flotation desiliconization process, after flotation of a magnesite mine in Haicheng, Liaoning Province, a magnesite concentrate with a MgO grade and recovery rate of 46.22% and 76.43% was finally obtained. The separation index is good and the purity of the magnesite concentrate is high.

[0049] Example 3

[0050] A magnesite mine in Haicheng, Liaoning Province was used as the ore sample, and its chemical composition is shown in Table 3.

[0051] Table 3 Chemical composition of a magnesite

[0052]

[0053] This embodiment provides a method for desiliconization and purification of the above-mentioned magnesite, comprising the following steps:

[0054] (1) Ore pre-treatment: The raw ore is crushed and ground to a grinding fineness of -0.074 mm, accounting for 80%, to obtain the processed ore.

[0055] (2) Positive flotation enrichment: Add 500g of treated ore to the flotation tank, add a certain amount of tap water to slurry, stir thoroughly, add 155g / t CMC and stir for 3min. Then add 140g / t fatty alcohol polyoxyethylene ether phosphate and 28g / t sodium linolenate and stir for 4min. Aerate flotation, the obtained foam product is magnesite coarse concentrate, and the flotation tank contains quartz.

[0056] After the coarse concentrate of magnesite is placed in the flotation tank, a certain amount of tap water is added to the slurry for a positive flotation separation. The product in the tank is the magnesite middlings, and the foam product is the magnesite concentrate.

[0057] Through the one-rough-one-fine flotation desiliconization process, after flotation of a magnesite mine in Haicheng, Liaoning Province, a magnesite concentrate with a MgO grade and recovery rate of 46.52% and 80.43% was finally obtained. The separation index is good and the purity of the magnesite concentrate is high.

[0058] Comparative Example 1

[0059] The difference between this comparative example and Example 1 is that no CMC is added in step (2), 285.5 g / t of fatty alcohol polyoxyethylene ether phosphate and 59.5 g / t of capric acid are used, and the rest is the same as in Example 1.

[0060] The MgO grade and recovery rate of the finally obtained magnesite concentrate were 20.81% and 39.23% respectively, the separation index was poor, and the purity of the magnesite concentrate was low.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 is that fatty alcohol polyoxyethylene ether phosphate is not added in step (2), CMC is 306.7 g / t, capric acid is 38.3 g / t, and the rest is the same as Example 1.

[0063] The MgO grade and recovery rate of the finally obtained magnesite concentrate were 21.01% and 40.25% respectively, the separation index was poor, and the purity of the magnesite concentrate was low.

[0064] Comparative Example 3

[0065] The difference between this comparative example and Example 1 is that no capric acid is added in step (2), CMC is 215.6 g / t, and fatty alcohol polyoxyethylene ether phosphate is 129.4 g / t. Other contents are the same as in Example 1.

[0066] The MgO grade and recovery rate of the finally obtained magnesite concentrate were 22.36% and 39.68% respectively, the separation index was poor, and the purity of the magnesite concentrate was low.

[0067] Comparative Example 4

[0068] The difference between this comparative example and Example 1 is that in step (2), 500 g of treated ore is added to the flotation tank, a certain amount of tap water is added to the slurry, and the ore slurry is obtained after sufficient stirring. Fatty alcohol polyoxyethylene ether phosphate and capric acid are first added to the ore slurry, and stirred for 4 minutes. Then CMC is added and stirred for 3 minutes. Aeration flotation is performed, and the obtained foam product is a rough concentrate of magnesite, and quartz is in the flotation tank. Others are the same as Example 1.

[0069] The MgO grade and recovery rate of the finally obtained magnesite concentrate are 21.35% and 40.65% respectively, the separation index is poor, and the purity of the magnesite concentrate is low.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnesite collector, characterized in that: The invention comprises the following components in parts by weight: 5-6 parts of fatty alcohol polyoxyethylene ether phosphate and 1-2 parts of fatty acid salt.

2. The magnesite collector according to claim 1, characterized in that: The fatty acid salt is selected from one of capric acid, sodium linoleate, sodium linolenate and sodium laurate.

3. A method for desiliconization and purification of magnesite, characterized in that: The steps include: (1) Ore pre-treatment: The raw ore is crushed and ground to a fineness of -0.074 mm, accounting for 78%-82%, to obtain the processed ore; (2) Positive flotation enrichment: providing treated ore, adding water to slurry, stirring thoroughly, adding a regulator and stirring, then adding the collector described in any one of claims 1 to 2 and stirring, aerating flotation, the obtained foam product is a rough concentrate of magnesite, and the obtained precipitate is quartz; The coarse concentrate of magnesite is slurried with water, and then subjected to a positive flotation separation, and the obtained precipitate is the magnesite middlings, and the foam product is the magnesite concentrate.

4. The method for desiliconization and purification of magnesite according to claim 3, characterized in that: The adjusting agent is selected from any one of CMC, water glass and sodium hexametaphosphate.

5. The method for desiliconization and purification of magnesite according to claim 3, characterized in that: The dosage of the adjusting agent is 125g / t-200g / t.

6. The method for desiliconization and purification of magnesite according to claim 3, characterized in that: The dosage of the collector is 145g / t-180g / t.

7. A magnesite concentrate, characterized in that: The magnesite concentrate is purified by the method described in any one of claims 3-6.

8. The magnesite concentrate according to claim 7, characterized in that: The MgO grade of the magnesite concentrate is 46.22%-47.55%.

9. The magnesite concentrate according to claim 7, characterized in that: The MgO recovery rate of the magnesite concentrate is 76.43%-86.55%.

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