Magnesite collector, magnesite desilication purification method and magnesite concentrate

Abstract

The application provides a magnesite collecting agent, a magnesite desilication purification method and a magnesite concentrate, and relates to the technical field of magnesite desilication 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 present application relates to the technical field of magnesite desilication purification process, in particular to a magnesite collector, a magnesite desilication purification method and a magnesite concentrate. BACKGROUND

[0002] Magnesite is an important non-metallic mineral, which is widely used in fireproof materials, chemical industry and building materials due to its good fire resistance and adhesion.

[0003] However, with the continuous development of China's economy, the domestic high-grade magnesite reserves have decreased sharply, therefore, how to purify low-grade magnesite to obtain high-purity magnesite concentrate has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0004] (I) Technical problem to be solved

[0005] In view of the shortcomings of the prior art, the present application provides a magnesite collector, a magnesite desilication purification method and a magnesite concentrate, which solves the technical problem of low purity of the magnesite concentrate obtained by the existing magnesite purification process.

[0006] (II) Technical scheme

[0007] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0008] In the first aspect, the present application provides a magnesite collector, which comprises the following components by mass fraction: fatty alcohol polyoxyethylene ether phosphate 5-6 parts, fatty acid salt 1-2 parts.

[0009] The above-mentioned magnesite collector comprises fatty alcohol polyoxyethylene ether phosphate and fatty acid salt, the fatty alcohol polyoxyethylene ether phosphate chemically adsorbs on the magnesium sites on the surface of the magnesite, thereby realizing the purpose of efficient positive flotation desilication of the magnesite, and greatly improving the foaming phenomenon of the foam, reducing the half-life of the foam and improving the foam merging ability. In addition, the fatty acid salt can make the surface of the magnesite particles hydrophobic, so that the magnesite particles are 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 good magnesite purification effect.

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

[0011] In the second aspect, the present application provides a magnesite desilication purification method, which comprises the following steps:

[0012] (1) ore pretreatment: the raw ore is crushed and ground to a grinding fineness of -0.074mm 78%-82%, to obtain the treated ore;

[0013] (2) positive flotation enrichment: providing the treated ore, adding water to adjust the pulp, fully stirring, adding the adjusting agent and stirring, then adding the collector of the first aspect and stirring, and aerofloat, the obtained foam product is magnesite rough concentrate, and the obtained sediment is quartz;

[0014] The magnesite rough concentrate is added to water to adjust the pulp, and then once positive flotation cleaning is carried out, and the obtained sediment is magnesite middlings, and the foam product is magnesite concentrate.

[0015] The above-mentioned magnesite desilication purification method selects the adjusting agent and the collector, first adds the adjusting agent to inhibit the quartz, and then adds the collector system composed of fatty alcohol polyoxyethylene ether phosphate and fatty acid salt. The fatty alcohol polyoxyethylene ether phosphate chemisorbs with the magnesium sites on the surface of the magnesite, so as to realize the purpose of efficient positive flotation desilication of the magnesite, and greatly improve the foam phenomenon of the foam, reduce the half-life of the foam, and improve the foam merging ability. In addition, the fatty acid salt can make the surface of the magnesite particles hydrophobic, so that the magnesite particles are 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, so as to obtain good magnesite purification effect.

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

[0017] Preferably, the amount of the adjusting agent is 125g / t-200g / t. If the amount of the adjusting agent is too large, the floatability of part of the magnesite particles is reduced, thereby reducing the recovery rate of the magnesite concentrate. If the amount of the adjusting agent is too small, part of the quartz will float, thereby reducing the grade of the magnesite concentrate.

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

[0019] In a third aspect, the present application provides a magnesite concentrate, which is purified by the method of 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 DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a flow chart of the method for desilication and purification of magnesite in embodiment 1. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The embodiments of the present application provide a magnesite collector, a method for desilication and purification of magnesite, and a magnesite concentrate, which solve the technical problem of low purity of the magnesite concentrate obtained by the existing magnesite purification process.

[0026] The technical solutions in the embodiments of the present application are as follows to solve the above technical problems:

[0027] The present application provides a method for realizing desilication of magnesite by positive flotation through the synergistic effect of an adjusting agent and a fatty alcohol polyoxyethylene ether phosphate and a fatty acid salt. The process provided by the present application has better desilication effect, and the flotation foam phenomenon is significantly improved.

[0028] The preparation method of the magnesite collector according to the present application is as follows:

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

[0030] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings in the specification and specific embodiments.

[0031] Embodiment 1

[0032] A certain 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 certain magnesite

[0034]

[0035] The embodiment provides a method for desiliconizing and purifying the above magnesite, which comprises the following steps as shown in the figure: Figure 1

[0036] (1) ore pretreatment: the raw ore is crushed and ground, and the ore is ground to a grinding fineness of 78% of -0.074 mm to obtain the treated ore.

[0037] (2) positive flotation enrichment: 500g of the treated ore is added to the flotation tank, a certain amount of tap water is added to the pulp, and the pulp is fully stirred to obtain the ore pulp. CMC is added to the ore pulp, and the addition amount of CMC is 200g / t (i.e. 200g of CMC is added to 1 ton of ore pulp, and the amount of other materials in the embodiment is also referred to the amount added to 1 ton of ore pulp), and stirred for 3min. Then add fatty alcohol polyoxyethylene ether phosphate 120g / t and sunflower acid 25g / t, and stir for 4min. Air flotation, the obtained foam product is magnesite rough concentrate, and the flotation tank is quartz.

[0038] The magnesite rough concentrate is placed in the flotation tank, a certain amount of tap water is added to the pulp, and one-stage positive flotation cleaning is carried out. The obtained tank product is magnesite middlings, and the foam product is magnesite concentrate.

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

[0040] Example 2

[0041] A certain magnesite 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 certain magnesite

[0043]

[0044] The embodiment provides a method for desiliconizing and purifying the above magnesite, which comprises the following steps:

[0045] (1) ore pretreatment: the raw ore is crushed and ground, and the ore is ground to a grinding fineness of 82% of -0.074 mm to obtain the treated ore.

[0046] ​(2) Positive flotation enrichment: 500g of the treated ore was added to the flotation tank, and a certain amount of tap water was added to adjust the pulp. After stirring evenly, 125g / t of CMC was added and stirred for 3min. Then 150g / t of fatty alcohol polyoxyethylene ether phosphate and 30g / t of sodium linoleate were added, and stirred for 4min. After aeration flotation, the foam product was magnesite rough concentrate, and the flotation tank was quartz.

[0047] The magnesite rough concentrate was placed in the flotation tank, and a certain amount of tap water was added to adjust the pulp. One-stage positive flotation cleaning was carried out, and the tank product was magnesite middlings, and the foam product was magnesite concentrate.

[0048] Through the one-rough-one-clean positive flotation desilication process, the Liaoning Haicheng magnesite was floated, and finally the magnesite concentrate with MgO grade and recovery rate of 46.22% and 76.43% was obtained, the separation index was good, and the purity of the magnesite concentrate was high.

[0049] Example 3

[0050] A certain magnesite in Liaoning Haicheng was used as a mineral sample, and its chemical composition was as shown in Table 3.

[0051] Table 3 Chemical composition of a certain magnesite

[0052]

[0053] The method for desilication and purification of the above magnesite provided in this embodiment includes the following steps:

[0054] (1) Ore pretreatment: The raw ore was crushed and ground to a grinding fineness of 80% passing 0.074mm to obtain treated ore.

[0055] (2) Positive flotation enrichment: 500g of the treated ore was added to the flotation tank, and a certain amount of tap water was added to adjust the pulp. After stirring evenly, 155g / t of CMC was added and stirred for 3min. Then 140g / t of fatty alcohol polyoxyethylene ether phosphate and 28g / t of sodium linoleate were added, and stirred for 4min. After aeration flotation, the foam product was magnesite rough concentrate, and the flotation tank was quartz.

[0056] The magnesite rough concentrate was placed in the flotation tank, and a certain amount of tap water was added to adjust the pulp. One-stage positive flotation cleaning was carried out, and the tank product was magnesite middlings, and the foam product was magnesite concentrate.

[0057] Through the one-rough-one-clean positive flotation desilication process, the Liaoning Haicheng magnesite was floated, and finally the magnesite concentrate with MgO grade and recovery rate of 46.52% and 80.43% was obtained, the separation index was good, and the purity of the magnesite concentrate was high.

[0058] Comparative Example 1

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

[0060] The MgO grade and recovery rate of the final magnesite concentrate are 20.81% and 39.23% respectively, the separation index is poor, and the purity of the magnesite concentrate is low.

[0061] Comparative Example 2

[0062] The difference between the present comparative example and Example 1 is that no CMC is added in step (2), fatty alcohol polyoxyethylene ether phosphate 285.5 g / t, sunflower acid 59.5 g / t, and the rest is the same as Example 1.

[0063] The MgO grade and recovery rate of the final magnesite concentrate are 20.81% and 39.23% respectively, the separation index is poor, and the purity of the magnesite concentrate is low.

[0064] Comparative Example 3

[0065] The difference between the present comparative example and Example 1 is that no CMC is added in step (2), fatty alcohol polyoxyethylene ether phosphate 285.5 g / t, sunflower acid 59.5 g / t, and the rest is the same as Example 1.

[0066] The MgO grade and recovery rate of the final magnesite concentrate are 20.81% and 39.23% respectively, the separation index is poor, and the purity of the magnesite concentrate is low.

[0067] Comparative Example 4

[0068] The difference between the present comparative example and Example 1 is that no CMC is added in step (2), fatty alcohol polyoxyethylene ether phosphate 285.5 g / t, sunflower acid 59.5 g / t, and the rest is the same as Example 1.

[0069] The MgO grade and recovery rate of the final magnesite concentrate are 20.81% and 39.23% respectively, the separation index is poor, and the purity of the magnesite concentrate is low.

[0070] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0071] The above examples are merely used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for purifying magnesite by desilication, characterized by, It comprises the following steps: (1) ore pretreatment: the raw ore is crushed and ground, and the ore is ground to a fineness of 78%-82% of -0.074 mm, to obtain treated ore; (2) positive flotation enrichment: providing the treated ore, adding water to adjust the slurry, fully stirring, adding an adjusting agent and stirring, then adding a collector and stirring, and aerating and floating, the obtained foam product is a magnesite rough concentrate, and the obtained sediment is quartz; The magnesite rough concentrate is added with water to adjust the slurry, and then once positive flotation cleaning is carried out, the obtained sediment is a magnesite middling, and the foam product is a magnesite concentrate; The collector comprises the following components by mass fraction: 5-6 parts of fatty alcohol polyoxyethylene ether phosphate, and 1-2 parts of a fatty acid salt.

2. The method for purifying magnesite by desilication according to claim 1, characterized by, The fatty acid salt is selected from one of sunflower acid, sodium linoleate, sodium linolenate, and sodium laurate.

3. The method for purifying magnesite by desilication according to claim 1, characterized by, The adjusting agent is selected from any one of CMC, water glass, and sodium hexametaphosphate.

4. The method for purifying magnesite by desilication according to claim 1, characterized by, The amount of the adjusting agent is 125 g / t-200 g / t.

5. The method for purifying magnesite by desilication according to claim 1, wherein The amount of the collector is 145 g / t-180 g / t.

6. A magnesite concentrate characterized in that, The magnesite concentrate is purified by the method of any one of claims 1-5.

7. The magnesite concentrate according to claim 6, characterized in that, The MgO grade of the magnesite concentrate is 46.22%-47.55%.

8. The magnesite concentrate according to claim 6, characterized in that, The MgO recovery rate of the magnesite concentrate is 76.43%-86.55%.

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