A method for removing impurities and improving the quality of potassium feldspar ore

Abstract

This invention belongs to the field of mineral processing technology, and more specifically, relates to a method for removing impurities and upgrading potassium feldspar ore. The invention involves two-stage high-intensity magnetic separation of potassium feldspar ore to obtain a magnetic concentrate; after adjusting the magnetic concentrate to neutral, roughing reagents are added for roughing flotation to obtain a rough concentrate; after adjusting the rough concentrate to neutral, cleaning reagents are added for cleaning flotation to obtain a clean concentrate, thus completing the process of removing impurities and upgrading potassium feldspar ore. This invention utilizes a combined magnetic-flotation mineral processing method, using metal ions as one component of the flotation reagents. This effectively removes dark-colored, iron-rich impurities, reduces the amount of harmful elements such as iron, calcium, and magnesium, avoids the problem of black spots or surface roughness in potassium feldspar during calcination, and improves the whiteness value and industrial utilization value of low-quality potassium feldspar.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and more specifically relates to a method for removing impurities and improving the quality of potassium feldspar ore. Background Technology

[0002] Potassium feldspar is a potassium-containing framework silicate mineral, mainly used in the glass, ceramics, refractory materials, and fertilizer industries. Although feldspar reserves are abundant, most are low-quality feldspar, often containing impurities such as iron, titanium, calcium, magnesium, and manganese. These elements are present in biotite, chlorite, amphibole, anorthite, and other clay minerals that coexist with potassium feldspar, limiting the high-value utilization of potassium feldspar.

[0003] Currently, flotation is commonly used in industrial production to remove impurities from potassium feldspar. This process utilizes the differences in surface properties and surface charging mechanisms of different minerals to remove dark-colored impurities such as iron and titanium from feldspar ore, and easily separates feldspar from silicate minerals such as quartz and mica. However, due to contamination by harmful elements such as iron, titanium, and calcium, or the presence of fine-grained dark-colored impurities in low-quality potassium feldspar ore, traditional amine flotation processes are ineffective at removing impurities. This results in problems such as black spots, uneven surfaces, and low whiteness in the concentrate during calcination, making it difficult for the product to meet sales standards and limiting the application range of potassium feldspar. Cationic amines are effective collectors for feldspar flotation, but in industrial applications, the pulp pH needs to be adjusted to acidic (2-3). Strongly acidic flotation environments can cause severe corrosion to equipment and pipelines, posing significant safety hazards and high wastewater treatment costs.

[0004] Therefore, it is necessary to provide a process technology applicable to the removal and upgrading of low-quality potassium feldspar ore, in order to reduce the amount of dark-colored iron-rich minerals in the ore, further enhance the industrial utilization value of potassium feldspar, and provide technical support for the comprehensive utilization of feldspar mineral resources. Summary of the Invention

[0005] The purpose of this invention is to provide a method for removing impurities and improving the quality of potassium feldspar ore. This method utilizes a magnetic-flotation combined beneficiation process, incorporating metal ions as one of the components of the flotation reagents, to solve the problems existing in the prior art and achieve the removal of magnetic impurity minerals and fine-grained dark-colored iron-rich impurity minerals from low-quality potassium feldspar ore.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] One of the technical solutions of this invention: provides a method for removing impurities and upgrading potassium feldspar ore, comprising the following steps:

[0008] Potassium feldspar ore was subjected to two-stage strong magnetic separation to remove impurities, resulting in magnetic concentrate (non-magnetic product);

[0009] After the magnetic concentrate is slurry adjusted to neutral, roughing reagents are added for roughing flotation to obtain roughing concentrate (unfloated product) and roughing tailings (froth product);

[0010] After the rough concentrate is adjusted to neutral, a refining reagent is added for refining flotation to obtain refined concentrate (unfloated product) and refined tailings (froth product).

[0011] Furthermore, the magnetic field strength of the two strong magnetic separation impurities is 0.6 to 1.4 T.

[0012] The magnetic separation stage (two-stage strong magnetic separation) can remove a large number of magnetic impurity minerals, such as biotite, chlorite, and amphibole.

[0013] Furthermore, the coarse and fine reagents are composed of a combined collector (hereinafter referred to as an anion-cation combined collector) and metal ions.

[0014] Preferably, the combined collector is composed of a cationic collector and an anionic collector; the mass ratio of the cationic collector to the anionic collector is 1-2:2-4.

[0015] The flotation stage (rougher flotation + cleaner flotation) can effectively remove other particulate dark impurity minerals, such as fine-grained biotite, phlogopite, chlorite, etc.

[0016] In this invention, the roughing flotation and cleaning flotation processes are reverse flotation.

[0017] Preferably, the amount of the combined collector in the roughing agent is 100-600 g / t, and the amount of metal ions is 100-500 g / t.

[0018] Preferably, the amount of the combined collector in the selected reagent is 50-300 g / t, and the amount of metal ions is 50-250 g / t.

[0019] This invention incorporates metal ions and anion-cation combined collectors in the flotation stage, which facilitates the selective flotation of fine-grained, dark-colored, iron-rich minerals into tailings and improves the flotation and impurity removal efficiency of potassium feldspar ore.

[0020] Preferably, the cationic collector is an alkyl primary amine with the structural formula R-NH2, wherein R is C 10 ~C 18 Straight-chain or branched hydrocarbon groups.

[0021] Preferably, the anionic collector is at least one selected from long-chain alkyl sulfonate, long-chain alkyl sulfate, and long-chain alkyl fatty acid salt.

[0022] In some specific embodiments, the long-chain alkyl sulfonate has the structural formula R-SO3. -·Me + The structural formula of the long-chain alkyl sulfate is R-OSO3. - ·Me + The structural formula of the long-chain alkyl fatty acid salt is R-COO - ·Me + Where R is C 12 ~C 22 Straight-chain or branched hydrocarbon groups.

[0023] This invention utilizes anion-cation combined collectors to facilitate the flotation, impurity removal, and quality improvement of potassium feldspar ore under neutral flotation conditions. Based on the "synergistic effect" generated between the combined collectors, the selectivity and solubility of the collectors are further enhanced.

[0024] The metal ion synergistic anion-cation combined collector further enhances the separation of fine-grained dark impurity minerals from potassium feldspar in the flotation stage, reduces the impact of harmful elements on the whiteness value of potassium feldspar ore, and avoids the problem of black spots or rough surface caused by the presence of iron, titanium, calcium and other elements in potassium feldspar during firing, thus improving the industrial utilization value of potassium feldspar.

[0025] In neutral flotation solutions, dark-colored iron-rich minerals such as biotite, phlogopite, chlorite, and amphibole, while negatively charged on their surfaces, still possess micro-regions of positive charge. Upon introduction of metal ions, these ions act as adsorption bridges for anion collectors, preferentially acting on the negative electron holes on the mineral surface, indirectly inducing the adsorption of anion collectors. The adsorbed anion active sites then interact again with cationic amine collectors, making the adsorption behavior of amine collectors even more robust.

[0026] Preferably, the metal ion includes Ca. 2+ Mg 2+ Fe 2+ and Cu 2+ At least one of them.

[0027] In some specific implementations, the Ca 2+ and Mg 2+ Provided by the corresponding metal chloride salt; the Fe 2+ and Cu 2+ It is provided by the corresponding metal sulfate.

[0028] In this invention, roughing tailings and cleaning tailings are combined to obtain flotation tailings.

[0029] The second technical solution of the present invention provides an application of the above method in improving the quality of potassium feldspar concentrate after beneficiation of low-grade potassium feldspar ore.

[0030] The third technical solution of this invention: provides a method for improving the quality of potassium feldspar concentrate obtained from the beneficiation of low-grade potassium feldspar ore, comprising the following steps:

[0031] Low-grade potassium feldspar ore was subjected to two-stage strong magnetic separation to remove impurities, resulting in magnetic concentrate (non-magnetic product);

[0032] After the magnetic concentrate is slurry adjusted to neutral, roughing reagents are added for roughing flotation to obtain roughing concentrate (unfloated product) and roughing tailings (froth product);

[0033] After adjusting the rough concentrate to neutral, a refining reagent is added for refining flotation to obtain refined concentrate (unfloated product) and refined tailings (froth product).

[0034] The coarse and fine reagents consist of a combination of collectors and metal ions;

[0035] The combined collector consists of a cationic collector and an anionic collector;

[0036] The metal ions include Ca. 2+ Mg 2+ Fe 2+ and Cu 2+ At least one of them.

[0037] In this invention, the roughing flotation and cleaning flotation processes are reverse flotation.

[0038] The present invention discloses the following technical effects:

[0039] This invention utilizes a combined magnetic-flotation beneficiation process, consisting of two stages of strong magnetic separation, one roughing flotation, and one cleaning flotation, to effectively remove dark-colored, iron-rich impurities associated with potassium feldspar ore, thereby improving the whiteness of potassium feldspar products. Furthermore, the process flow of this invention is relatively short.

[0040] This invention utilizes anion-cation combined collectors and metal ions as reagents for roughing and cleaning flotation during the flotation process. The introduction of metal ions further enhances the flotation selectivity of the collectors, which is beneficial for the capture and flotation of fine-grained impurities. Under natural pH (neutral) conditions, the separation and removal of potassium feldspar is achieved, avoiding the problems of equipment corrosion and environmental pollution caused by acidic flotation environments.

[0041] The method of this invention can effectively reduce the amount of iron-rich dark gangue minerals, avoid the problem of black spots or rough surface of potassium feldspar during firing, and improve the whiteness value and industrial utilization value of potassium feldspar. Attached Figure Description

[0042] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0043] Figure 1 This is a process flow diagram of an embodiment of the present invention. Detailed Implementation

[0044] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0045] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0046] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0047] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0048] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0049] In a specific embodiment of the present invention, the magnetic separation equipment used for strong magnetic separation and impurity removal is a Slon-type vertical ring pulsating high gradient magnetic separator.

[0050] Figure 1 This is a process flow diagram of an embodiment of the present invention.

[0051] Unless otherwise specified, all raw materials used in the specific embodiments of this invention are commercially available products.

[0052] Example 1

[0053] The steps for impurity removal and upgrading of potassium feldspar ore are as follows:

[0054] S1. The selected potassium feldspar ore (raw ore) has a particle size of less than 1 mm. After grinding and adding water to adjust the slurry, the raw ore slurry is obtained.

[0055] The grinding concentration is 67%, the grinding fineness is 200 mesh, the mass percentage is 30%, and the mass percentage concentration of the raw ore slurry is 38%.

[0056] The main components of potassium feldspar ore are shown in Table 1:

[0057] Table 1 Chemical composition of potassium feldspar ore / wt.%

[0058] <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[Fe2O3]]> CaO MgO <![CDATA[TiO2]]> 70.12 15.38 6.63 2.56 2.70 0.93 1.28 0.40

[0059] S2. The raw ore slurry is subjected to two strong magnetic separations (strong magnetic separation I, 0.6T; strong magnetic separation II, 1.4T) using a Slon type vertical ring pulsating high gradient magnetic separator to remove impurities, resulting in magnetic concentrate (non-magnetic product) and magnetic product (magnetic tailings).

[0060] S3. After the magnetic concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, 200 g / t of metal ions (calcium chloride, magnesium chloride, ferrous sulfate or copper sulfate) is added per ton of raw ore, and stirred for 4 minutes; 400 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) is added, and stirred for 4 minutes. Then, aeration is started to carry out one roughing (roughing flotation), with a frothing time of 6 minutes, to obtain roughing tailings (froth product) and roughing concentrate (unflotated product);

[0061] S4. After the rough concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, add 100 g / t of metal ions (calcium chloride, magnesium chloride, ferrous sulfate or copper sulfate) per ton of raw ore and stir for 4 minutes; add 200 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio), and start aeration for primary cleaning (clean flotation), with a skimming time of 6 minutes, to obtain clean concentrate and clean tailings;

[0062] S5. Roughing tailings and cleaning tailings are combined into flotation tailings.

[0063] Comparative Example 1

[0064] Compared with Example 1, the flotation reagents used in the roughing flotation and cleaning flotation are only equal amounts of anion-cation combined collectors. That is, 400 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) is used in the roughing flotation, and 200 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) is used in the cleaning flotation.

[0065] Comparative Example 2

[0066] The only difference from Example 1 is that the pH value after slurry preparation in steps S3 and S4 is 4.

[0067] Comparative Example 3

[0068] The only difference from Example 1 is that the pH value after slurry preparation in steps S3 and S4 is 10.

[0069] After the selected concentrates in step S4 of Examples 1 and Comparative Examples 1-3 were filtered, dried, and weighed, they were used as the final concentrates. After calcination, their whiteness value (%) was tested, and the yield was calculated. The results are shown in Table 2.

[0070] Table 2

[0071]

[0072]

[0073] As can be seen from Table 2, Example 2 of the present invention adopts a magnetic-flotation combined mineral processing technology. During the flotation process, metal ions and anion-cation combined collectors are used in combination. After one roughing and one cleaning, feldspar concentrate with a high whiteness value is obtained. Impurities in potassium feldspar ore are effectively removed in a natural pH (neutral) solution environment.

[0074] Under the same process conditions, when Comparative Example 2 used a combination of metal ions and anion-cation collectors in an acidic (pH=3) flotation environment, it could not effectively remove impurities from potassium feldspar ore, and the whitening and upgrading effect of feldspar concentrate was poor. When Comparative Example 3 used a combination of metal ions and anion-cation collectors in an alkaline (pH=10) environment, the whiteness value of the feldspar concentrate obtained was low, and the concentrate yield was relatively low.

[0075] Example 2

[0076] The steps for removing impurities and upgrading potassium feldspar ore are as follows:

[0077] S1. Selected potassium feldspar ore (raw ore, same as in Example 1) with a particle size of less than 1 mm, is crushed, ground, and mixed with water to obtain raw ore slurry;

[0078] The grinding concentration is 67%, the grinding fineness is 200 mesh, the mass percentage is 30%, and the mass percentage concentration of the raw ore slurry is 38%.

[0079] S2. The raw ore slurry is subjected to two strong magnetic separations (strong magnetic separation I, 0.6T; strong magnetic separation II, 1.4T) using a Slon type vertical ring pulsating high gradient magnetic separator to remove impurities, resulting in magnetic concentrate (non-magnetic product) and magnetic product (magnetic tailings).

[0080] S3. After the magnetic concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, 100 g / t, 200 g / t, 300 g / t, 400 g / t or 500 g / t (calcium chloride) of metal ions are added per ton of raw ore, and stirred for 4 minutes; 400 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) is added, and stirred for 4 minutes. Then, aeration is started to carry out one roughing (roughing flotation), with a frothing time of 6 minutes, to obtain roughing tailings (froth product) and roughing concentrate (unflotated product);

[0081] S4. After the roughing concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, add 50 g / t, 100 g / t, 150 g / t, 200 g / t or 250 g / t (calcium chloride) of metal ions per ton of raw ore, and stir for 4 minutes; add 200 g / t of anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio), and start aeration for a primary cleaning (clean flotation), with a skimming time of 6 minutes, to obtain clean concentrate and clean tailings;

[0082] S5. Roughing tailings and cleaning tailings are combined into flotation tailings.

[0083] After the selected concentrate in step S4 of Example 2 was filtered, dried and weighed, it was used as the final concentrate. After calcination, its whiteness value (%) was tested and the yield was calculated. The results are shown in Table 3.

[0084] Table 3. Effects of metal ion dosage on potassium feldspar ore beneficiation parameters

[0085]

[0086] As can be seen from the data in Table 3, the whiteness of the concentrate after calcination first increases and then decreases with the amount of metal ions used, while the concentrate yield increases.

[0087] Example 3

[0088] The steps for removing impurities and upgrading potassium feldspar ore are as follows:

[0089] S1. Selected potassium feldspar ore (raw ore, same as in Example 1) with a particle size of less than 1 mm, is crushed, ground, and mixed with water to obtain raw ore slurry;

[0090] The grinding concentration is 67%, the grinding fineness is 200 mesh, the mass percentage is 30%, and the mass percentage concentration of the raw ore slurry is 38%.

[0091] S2. The raw ore slurry is subjected to two strong magnetic separations (strong magnetic separation I, 0.6T; strong magnetic separation II, 1.4T) using a Slon type vertical ring pulsating high gradient magnetic separator to remove impurities, resulting in magnetic concentrate (non-magnetic product) and magnetic product (magnetic tailings).

[0092] S3. After the magnetic concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, 200 g / t of metal ions (calcium chloride) is added per ton of raw ore, and stirred for 4 minutes. Then, 100 g / t, 200 g / t, 300 g / t, 400 g / t, 500 g / t, or 600 g / t of an anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) is added, and stirred for 4 minutes. After stirring, aeration is started to carry out one roughing (roughing flotation), with a frothing time of 6 minutes, to obtain roughing tailings (froth product) and roughing concentrate (unflotated product).

[0093] S4. After the roughing concentrate is slurry-adjusted and stirred for 2 minutes, under natural pH (neutral) conditions, 100 g / t of metal ions (calcium chloride) is added per ton of raw ore, and stirred for 4 minutes. Then, 50 g / t, 100 g / t, 150 g / t, 200 g / t, 250 g / t, or 300 g / t of an anion-cation combined collector (dodecylamine:sodium oleate = 1:3, mass ratio) are added, and aeration is started for a first cleaning (clean flotation). The frothing time is 6 minutes, and clean concentrate and clean tailings are obtained.

[0094] S5. Roughing tailings and cleaning tailings are combined into flotation tailings.

[0095] After the selected concentrate in step S4 of Example 3 was filtered, dried and weighed, it was used as the final concentrate. After calcination, its whiteness value (%) was tested and the yield was calculated. The results are shown in Table 4.

[0096] Table 4. Effect of anion-cationic combined collector dosage on potassium feldspar ore beneficiation parameters

[0097]

[0098]

[0099] As can be seen from the data in Table 4, when using reverse flotation to remove impurities from low-quality potassium feldspar ore, under the same process conditions, both excessive and insufficient dosage of the anion-cation combined collector will affect the quality of potassium feldspar flotation concentrate, while appropriate collector dosage can significantly improve the whiteness of potassium feldspar concentrate.

[0100] Example 4

[0101] Compared with Example 1, the difference lies in the combination and ratio of the anion-cation combined collector, and the specific combination and ratio are shown in Table 4.

[0102] After the selected concentrate in step S4 of Example 4 was filtered, dried and weighed, it was used as the final concentrate. After calcination, its whiteness value (%) was tested and the yield was calculated. The results are shown in Table 5.

[0103] Table 5. Effects of Alkyl Primary Amine Types and Proportions on Flotation Indicators of Combined Collectors for Potassium Feldspar Ore.

[0104]

[0105] As can be seen from the data in Table 4, by using the magnetic-flotation combined beneficiation process, after two strong magnetic separations in a natural pH flotation solution environment, and using a combination of metal ions and anion-cation collectors to remove impurities from potassium feldspar ore, a roughing and cleaning process can be carried out to obtain feldspar concentrate with high yield and whiteness value, effectively avoiding the problems of equipment corrosion and environmental pollution caused by acidic flotation environment.

[0106] Example 5

[0107] The only difference from Example 1 is that the types of anionic collectors are different, as shown in Table 5.

[0108] After the selected concentrate in step S4 of Example 5 was filtered, dried and weighed, it was used as the final concentrate. After calcination, its whiteness value (%) was tested and the yield was calculated. The results are shown in Table 6.

[0109] Table 6. Effects of Anionic Collector Type on Flotation Indicators of Combined Collectors for Potassium Feldspar Ore.

[0110] Anion-cation combined collector Concentrate yield (%) Concentrate whiteness (%) Dodecylamine: Sodium dodecyl sulfonate 57.39 52.40 Dodecylamine: Sodium dodecyl sulfate 53.21 52.80 Dodecylamine: Oxidized Paraffin Soap 64.40 53.70 Dodecylamine: Sodium oleate 63.09 55.40 Dodecylamine: Sodium Linoleate 59.97 52.90

[0111] As shown in Table 6, the magnetic-flotation combined beneficiation process in this embodiment effectively removes impurities from potassium feldspar ore. In a neutral flotation environment, feldspar concentrate with high yield and whiteness can be obtained by adding different types of long-chain anionic collectors in combination with dodecylamine.

[0112] At the same time, with Ca 2+ The chemical multi-element analysis results of the potassium feldspar concentrate obtained by synergistic flotation with ionic and anion-cation combined collector (dodecylamine: sodium oleate = 1:3) are shown in Table 7. It can be seen that the content of elements such as iron, calcium and magnesium in the concentrate is low.

[0113] Table 7 Chemical composition of potassium feldspar concentrate / wt.%

[0114] <![CDATA[SiO2]]> <![CDATA[AI2O3]]> <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[Fe2O3]]> CaO MgO <![CDATA[TiO2]]> 66.96 19.12 9.14 4.47 0.03 0.14 0.11 0.03

[0115] Comparative Example 4

[0116] The only difference from Example 1 is that the anion-cation combined collector is replaced with a cationic collector (dodecylamine) at a dosage of 100 g / t.

[0117] Comparative Example 5

[0118] Compared with Example 1, the only difference is that the anion-cation combined collector is replaced with an anionic collector (sodium oleate) at a dosage of 300 g / t.

[0119] After filtration, drying, and weighing, the selected concentrate from step S4 of Comparative Examples 4-5 was used as the final concentrate. After calcination, its whiteness value (%) was tested, and the yield was calculated. The results are shown in Table 8.

[0120] Table 8

[0121]

[0122] As shown in Table 8, compared with Example 1, the effects of using a single cationic amine collector or a single anionic collector in conjunction with metal ions for flotation and impurity removal of low-quality potassium feldspar ore were poor in both quality improvement and whitening. In Comparative Example 4, when dodecylamine was used as a collector in a natural pH flotation environment in conjunction with metal ions, it could not effectively remove dark-colored impurity minerals from the potassium feldspar ore, and the obtained feldspar concentrate had virtually no whitening effect and a low concentrate yield. In Comparative Example 5, when sodium oleate was used in conjunction with metal ion flotation, it could not effectively remove impurities from the potassium feldspar ore; the weak collecting ability of the anionic collector resulted in poor whitening and quality improvement of the feldspar concentrate, and the obtained concentrate had a low whiteness value.

[0123] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0124] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for removing impurities and upgrading potassium feldspar ore, characterized in that the steps include: include: Two-stage high-intensity magnetic separation was performed on potassium feldspar ore to remove impurities, resulting in magnetic concentrate. After the magnetic concentrate is adjusted to neutral, roughing reagents are added for roughing flotation to obtain roughing concentrate and roughing tailings. After adjusting the rough concentrate to neutral, a refining reagent is added for refining flotation to obtain refined concentrate and refined tailings. The coarse and fine reagents consist of a combination of collectors and metal ions; The combined collector consists of a cationic collector and an anionic collector; The metal ions include Ca. 2+ Mg 2+ Fe 2+ and Cu 2+ At least one of them; The amount of combined collector in the roughing agent is 100-600 g / t, and the amount of metal ions is 100-500 g / t; the amount of combined collector in the cleaning agent is 50-300 g / t, and the amount of metal ions is 50-250 g / t.

2. The method as described in claim 1, characterized in that, The magnetic field strength of the two strong magnetic separation processes is 0.6~1.4T.

3. The method as described in claim 1, characterized in that, The mass ratio of the cationic collector to the anionic collector is 1~2:2~4.

4. The method as described in claim 1, characterized in that, The cationic collector is an alkyl primary amine; the anionic collector is at least one of long-chain alkyl sulfonate, long-chain alkyl sulfate, and long-chain alkyl fatty acid salt.

5. The method as described in claim 1, characterized in that, The Ca 2+ and Mg 2+ Provided by the corresponding metal chloride salt; the Fe 2+ and Cu 2+ It is provided by the corresponding metal sulfate.

6. The application of the method according to any one of claims 1 to 5 in improving the quality of potassium feldspar concentrate after beneficiation of low-grade potassium feldspar ore.

7. A method for improving the quality of potassium feldspar concentrate obtained from the beneficiation of low-grade potassium feldspar ore, characterized in that the steps include... include: Low-grade potassium feldspar ore is subjected to two-stage strong magnetic separation to remove impurities, resulting in magnetic concentrate. After the magnetic concentrate is adjusted to neutral, roughing reagents are added for roughing flotation to obtain roughing concentrate and roughing tailings. After adjusting the rough concentrate to neutral, a refining reagent is added for refining flotation to obtain refined concentrate and refined tailings. The coarse and fine reagents consist of a combination of collectors and metal ions; The combined collector consists of a cationic collector and an anionic collector; The metal ions include Ca. 2+ Mg 2+ Fe 2+ and Cu 2+ At least one of them.

8. The method as described in claim 7, characterized in that, The mass ratio of the cationic collector to the anionic collector is 1~2:2~4.

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