Impurity removal and quality improvement method for potassium feldspar ore

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a potassium feldspar ore impurity removal and quality improvement method. The potassium feldspar ore is subjected to two-stage high-intensity magnetic separation impurity removal, and magnetic separation concentrate is obtained; after the magnetic concentrate is mixed to be neutral, a roughing agent is added for roughing flotation, and roughing concentrate is obtained; and after the roughing concentrate is subjected to size mixing to be neutral, a concentration reagent is added for concentration flotation, concentration concentrate is obtained, and the potassium feldspar ore impurity removing and quality improving technology is completed. According to the method, a magnetic-flotation combined beneficiation method is utilized, metal ions serve as one of flotation reagent components, dark iron-rich impurity minerals can be effectively removed, the number of harmful elements such as iron, calcium and magnesium can be reduced, the problem that black spots or rough surfaces appear in the firing process of the potassium feldspar can be avoided, and the quality of the potassium feldspar is improved. The whiteness value and the industrial utilization value of the low-quality potassium feldspar are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and more specifically relates to a method for removing impurities and improving the quality of potassium feldspar ore. Background Art

[0002] Potassium feldspar is a potassium-containing framework silicate mineral, which is mainly used in glass, ceramics, refractory materials and fertilizer industries. Although the reserves of feldspar mineral resources are abundant, most of them are low-quality feldspars, which are often accompanied by impurity elements such as iron, titanium, calcium, magnesium and manganese. These elements are present in biotite, chlorite, amphibole, calcium feldspar and other clay minerals that coexist (or are associated) with potassium feldspar, which limits the high-value utilization of potassium feldspar.

[0003] At present, flotation is commonly used in industrial production to remove impurities from potassium feldspar. This type of process utilizes the differences in the surface properties and surface charging mechanisms of different minerals, and can remove dark impurity minerals such as iron and titanium in feldspar ores, and is easy to separate feldspar from silicate minerals such as quartz and mica. Due to the contamination of harmful elements such as iron, titanium and calcium in low-quality potassium feldspar ores or the presence of dark impurity minerals with fine particle sizes, the traditional amine flotation process has a poor effect on the removal of impurities from potassium feldspar, which causes black spots, uneven surfaces, and low whiteness values ​​in the concentrate during firing. The product is difficult to meet sales standards, which reduces the scope of application of potassium feldspar. Cationic amines are effective collectors for feldspar flotation removal. In the process of industrial application, the pH of the ore pulp needs to be adjusted to acidic (2-3). The strongly acidic flotation environment is prone to cause serious corrosion to equipment and transportation pipelines, with great safety hazards and high wastewater treatment costs.

[0004] Therefore, how to provide a process technology that can be used to remove impurities and improve the quality of low-quality potassium feldspar ore, so as to reduce the dark impurities and 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 the present invention is to provide a method for removing impurities and improving the quality of potassium feldspar ore, which utilizes a magnetic-flotation combined beneficiation method and uses metal ions as one of the flotation agent components to solve the problems existing in the above-mentioned prior art and achieve the removal of magnetic impurity minerals in low-quality potassium feldspar ore and fine-grained dark impurity iron-rich minerals.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] One of the technical solutions of the present invention is to provide a method for removing impurities and improving the quality of potassium feldspar ore, the steps comprising:

[0008] The potassium feldspar ore is subjected to two-stage strong magnetic separation to remove impurities and obtain magnetic concentrate (non-magnetic product);

[0009] After slurrying the magnetic concentrate to neutrality, a roughing agent is added to perform roughing flotation to obtain a roughing concentrate (unfloated product) and a roughing tailing (foam product);

[0010] The rougher concentrate is slurried to neutrality and then a concentration agent is added to carry out concentration flotation to obtain a concentrated concentrate (unfloated product) and a concentrated tailing (foam product).

[0011] Furthermore, the magnetic field strength of the two-stage strong magnetic separation and impurity removal is 0.6-1.4T.

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

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

[0014] Preferably, the combined collector consists 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 (rough flotation + fine flotation) can effectively remove other particulate dark impurity minerals, such as fine-grained biotite, phlogopite, chlorite and other minerals.

[0016] The roughing flotation and cleaning flotation processes in the present invention are reverse flotation.

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

[0018] Preferably, the amount of the combined collector in the beneficiation agent is 50-300 g / t, and the amount of the metal ion is 50-250 g / t.

[0019] The invention adds metal ions and anion-cation combined collectors in the flotation stage for use together, which is conducive to the selective floating of fine-grained dark iron-rich minerals to become tailings, thereby improving 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 or branched chain hydrocarbon group.

[0021] Preferably, the anionic collector is at least one of long-chain alkyl sulfonates, long-chain alkyl sulfates and long-chain alkyl fatty acid salts.

[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 or branched chain hydrocarbon group.

[0023] The present invention uses an anion-cation combination collector to facilitate the flotation, impurity removal and quality improvement of potassium feldspar ore under neutral flotation environment conditions, and based on the "synergistic effect" generated between the combined collectors, further enhances the selectivity of the collectors and the solubility of the reagents.

[0024] Metal ions cooperate with anion-cation combination collectors to further enhance the separation of fine-grained dark impurity minerals and potassium feldspar in the flotation stage, reducing the impact of harmful elements on the whiteness value of potassium feldspar ore. At the same time, it can avoid the problem of black spots or rough surface during firing of potassium feldspar due to the presence of iron, titanium, calcium, etc., thereby improving the industrial utilization value of potassium feldspar.

[0025] In the neutral flotation solution, although the surface of dark impurity iron-rich minerals such as biotite, phlogopite, chlorite and amphibole is negatively charged, there are still positively charged micro-regions. After the introduction of metal ions, the metal ions act as an adsorption bridge for anionic collectors, preferentially acting on the negative electron holes on the mineral surface, indirectly inducing the adsorption of anionic collectors, and the anionic active sites adsorbed on the surface react with cationic amine collectors again, making the adsorption behavior of amine collectors more solid.

[0026] Preferably, the metal ions include Ca 2+ Mg 2+ , Fe 2+ and Cu 2+ At least one of .

[0027] In some specific embodiments, the Ca 2+ and Mg 2+ Provided by the corresponding metal chloride; the Fe 2+ and Cu 2+ Provided by the corresponding metal sulfates.

[0028] In the present invention, the rougher tailings and the cleaner tailings are combined to obtain the flotation tailings.

[0029] The second technical solution of the present invention is to provide 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 the present invention is to provide a method for improving the quality of potassium feldspar concentrate obtained by beneficiation of low-grade potassium feldspar ore, the steps comprising:

[0031] The low-grade potassium feldspar ore is subjected to two-stage strong magnetic separation to remove impurities and obtain magnetic concentrate (non-magnetic product);

[0032] After slurrying the magnetic concentrate to neutrality, a roughing agent is added to perform roughing flotation to obtain a roughing concentrate (unfloated product) and a roughing tailing (foam product);

[0033] After slurrying the rougher concentrate to neutrality, a beneficiation agent is added to perform beneficiation flotation to obtain beneficiated concentrate (unfloated product) and beneficiated tailings (foam product);

[0034] The roughing agent and the cleaning agent are composed of a combined collector and metal ions;

[0035] The combined collector is composed 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 .

[0037] The roughing flotation and cleaning flotation processes in the present invention are reverse flotation.

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

[0039] The present invention uses a magnetic-flotation combined mineral separation process, with two stages of strong magnetic separation, one roughing flotation and one fine flotation process, to effectively remove dark iron-rich impurity minerals coexisting (associated) with potassium feldspar ore, improve the whiteness value of potassium feldspar products, and the process flow of the present invention is relatively short.

[0040] The present invention uses an anionic-cationic combined collector and metal ions as reagents for rough flotation and fine flotation during the flotation process. The introduction of metal ions further improves the flotation selectivity of the collector, which is beneficial for the collection and floating of fine impurity minerals. The separation and impurity removal of potassium feldspar is achieved under natural pH (neutral) conditions, avoiding the problem of easy corrosion of equipment and environmental pollution in the acidic flotation environment.

[0041] The method of the invention can effectively reduce the amount of ferrous 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0043] Figure 1 The process flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

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

[0045] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0046] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0047] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

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

[0049] In the specific implementation manner 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 The process flow chart of an embodiment of the present invention.

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

[0052] Example 1

[0053] The steps of removing impurities and improving the quality 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, and is ground and slurried with water to obtain raw ore slurry;

[0055] Among them, the grinding concentration is 67%, the mass percentage of grinding fineness of 200 mesh is 30%, and the mass percentage concentration of the original 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 pulp is subjected to two strong magnetic separations to remove impurities (strong magnetic separation I, 0.6T; strong magnetic separation II, 1.4T) using a Slon type vertical ring pulsating high gradient magnetic separator to obtain magnetic concentrate (non-magnetic product) and magnetic product (magnetic tailings);

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

[0061] S4, after the roughing concentrate is slurried and stirred for 2 minutes, 100g / t of metal ions (calcium chloride, magnesium chloride, ferrous sulfate or copper sulfate) is added per ton of raw ore under natural pH (neutral) conditions, and stirred for 4 minutes; 200g / t of anion-cation combined collector (dodecylamine: sodium oleate = 1:3, mass ratio) is added, and aeration is started for a first concentration (concentrated flotation), and the scraping time is 6 minutes to obtain a concentrated ore and a concentrated tailings;

[0062] S5, rougher tailings and concentrated tailings are combined into flotation tailings.

[0063] Comparative Example 1

[0064] Compared with Example 1, the flotation reagents in the roughing flotation and the cleaning flotation only use the same amount of anion-cation combination collector, that is, 400 g / t of anion-cation combination collector (dodecylamine: sodium oleate = 1:3, mass ratio) is used in the roughing flotation, and 200 g / t of anion-cation combination collector (dodecylamine: sodium oleate = 1:3, mass ratio) is used in the cleaning flotation.

[0065] Comparative Example 2

[0066] Compared with Example 1, the only difference is that the pH value after slurry adjustment in steps S3 and S4 is 4.

[0067] Comparative Example 3

[0068] Compared with Example 1, the only difference is that the pH value after slurry adjustment in steps S3 and S4 is 10.

[0069] The selected concentrate in step S4 of Example 1 and Comparative Examples 1 to 3 was filtered, dried and weighed, and then fired as the final concentrate, and its whiteness value (%) was detected and the yield was calculated. The results are shown in Table 2.

[0070] Table 2

[0071]

[0072]

[0073] It can be seen from the contents of Table 2 that Example 2 of the present invention adopts a magnetic-flotation combined beneficiation process. In the flotation process, metal ions are used in combination with an anion-cation combination collector. After one roughing and one fine separation, a feldspar concentrate with a high whiteness value is obtained, and impurities in the potassium feldspar ore are effectively removed in a natural pH (neutral) solution environment.

[0074] Under the same process conditions, when comparative example 2 adopts metal ions and anion-cation combination collector for flotation in an acidic (pH=3) flotation environment, impurities in potassium feldspar ore cannot be effectively removed, and the effect of whitening and improving the quality of feldspar concentrate is not good; when comparative example 3 selects metal ions and anion-cation combination collector for flotation in an alkaline (pH=10) environment, the whiteness value of the obtained feldspar concentrate is low, and the concentrate yield is relatively low.

[0075] Example 2

[0076] The steps of removing impurities and improving the quality of potassium feldspar ore are as follows:

[0077] S1, the selected potassium feldspar ore (raw ore, the same as in Example 1) has a particle size of less than 1 mm, and is crushed, ground, and water-added to obtain raw ore slurry;

[0078] Among them, the grinding concentration is 67%, the mass percentage of grinding fineness of 200 mesh is 30%, and the mass percentage concentration of the original ore slurry is 38%;

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

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

[0081] S4. After the roughing concentrate is slurried and stirred for 2 minutes, 50g / t, 100g / t, 150g / t, 200g / t or 250g / t (calcium chloride) of metal ions is added per ton of raw ore under natural pH (neutral) conditions, and stirred for 4 minutes; 200g / t of anion-cation combined collector (dodecylamine: sodium oleate = 1:3, mass ratio) is added, and aeration is started for a first concentration (concentrated flotation), and the scraping time is 6 minutes to obtain a concentrated ore and a concentrated tailings;

[0082] S5, rougher tailings and concentrated tailings are combined into flotation tailings.

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

[0084] Table 3 Effect of metal ion dosage on potassium feldspar ore separation index

[0085]

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

[0087] Example 3

[0088] The steps of removing impurities and improving the quality of potassium feldspar ore are as follows:

[0089] S1, the selected potassium feldspar ore (raw ore, the same as in Example 1) has a particle size of less than 1 mm, and is crushed, ground, and water-added to obtain raw ore slurry;

[0090] Among them, the grinding concentration is 67%, the mass percentage of grinding fineness of 200 mesh is 30%, and the mass percentage concentration of the original ore slurry is 38%;

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

[0092] S3. After the magnetic concentrate is slurried and stirred for 2 minutes, 200g / t (calcium chloride) of metal ions is added per ton of raw ore under natural pH (neutral) conditions, and stirred for 4 minutes; 100g / t, 200g / t, 300g / t, 400g / t, 500g / t or 600g / t (dodecylamine: sodium oleate = 1:3, mass ratio) of anionic-cationic combined collector is added, and after stirring for 4 minutes, aeration is started to carry out a roughing (roughing flotation) with a scraping time of 6 minutes to obtain roughing tailings (foam product) and roughing concentrate (unfloated product);

[0093] S4, after the roughing concentrate is slurried and stirred for 2 minutes, 100g / t (calcium chloride) of metal ions is added per ton of raw ore under natural pH (neutral) conditions, and stirred for 4 minutes; 50g / t, 100g / t, 150g / t, 200g / t, 250g / t or 300g / t of anion-cation combined collector (dodecylamine: sodium oleate = 1:3, mass ratio) is added, and aeration is started for a first concentration (concentrated flotation), and the scraping time is 6 minutes to obtain a concentrated ore and a concentrated tailings;

[0094] S5, rougher tailings and concentrated tailings are combined into flotation tailings.

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

[0096] Table 4 Effect of the dosage of anion-cation combined collector on the separation index of potassium feldspar ore

[0097]

[0098]

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

[0100] Example 4

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

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

[0103] Table 5 Effect of the type and proportion of alkyl primary amines on the flotation index of potassium feldspar ore with combined collector

[0104]

[0105] It can be seen from the data in Table 4 that by using the magnetic-flotation combined beneficiation process, after two strong magnetic separations, in the natural pH flotation solution environment, using metal ions and anion-cation combination collectors to remove impurities from the potassium feldspar ore, one roughing separation and one fine separation, a feldspar concentrate with high yield and whiteness value can be obtained, which effectively avoids the problem of equipment corrosion and environmental pollution in the acidic flotation environment.

[0106] Example 5

[0107] Compared with Example 1, the only difference is that the type of anionic collector is different, and the specific types are shown in Table 5.

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

[0109] Table 6 Effect of anionic collector types on combined collector flotation parameters of potassium feldspar ore

[0110] Anionic-cationic combined collector Concentrate yield (%) Concentrate whiteness (%) Dodecylamine:sodium dodecyl sulfonate 57.39 52.40 Dodecylamine: sodium lauryl 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] It can be seen from the data in Table 6 that the present embodiment adopts the magnetic-flotation combined beneficiation process to effectively remove impurities in the potassium feldspar ore. In a neutral flotation environment, by adding different types of long-chain anion collectors in combination with dodecylamine, a feldspar concentrate with a high yield and whiteness value can be obtained.

[0112] At the same time, Ca 2+ The chemical multi-element analysis results of the potassium feldspar concentrate product obtained after the synergistic flotation of ions and anionic-cationic combined collectors (dodecylamine: sodium oleate = 1:3) are shown in Table 7. It can be seen that the contents of elements such as iron, calcium and magnesium in the concentrate product are 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] Compared with Example 1, the only difference is that the anion-cation combination collector is replaced by a cationic collector (dodecylamine) with a dosage of 100 g / t.

[0117] Comparative Example 5

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

[0119] The selected concentrate in step S4 of comparative examples 4 to 5 was filtered, dried and weighed, and then fired as the final concentrate, and its whiteness value (%) was detected and the yield was calculated. The results are shown in Table 8.

[0120] Table 8

[0121]

[0122] It can be seen from the data in Table 8 that, compared with Example 1, when a single cationic amine collector or a single anionic collector is used in conjunction with metal ions to flotation and remove impurities from low-quality potassium feldspar ore, the quality improvement and whitening effect is poor. Comparative Example 4, when dodecylamine is used as a collector in a natural pH flotation environment in combination with metal ions, cannot effectively remove dark impurity minerals in potassium feldspar ore, and the obtained feldspar concentrate has basically no whitening effect, and the concentrate yield is low; Comparative Example 5, when sodium oleate is used in combination with metal ion flotation, cannot effectively remove impurities in potassium feldspar ore, and the anionic collector with weak collection ability has a poor effect on whitening and improving the quality of feldspar concentrate, and the whiteness value of the obtained concentrate is low.

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

[0124] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for removing impurities and improving the quality of potassium feldspar ore, characterized in that the steps include: The potassium feldspar ore is subjected to two-stage strong magnetic separation to remove impurities and obtain magnetic separation concentrate; After slurrying the magnetic concentrate to neutrality, a roughing agent is added to perform roughing flotation to obtain a roughing concentrate and a roughing tailing; After slurrying the rougher concentrate to neutrality, a concentrating agent is added to perform concentrating flotation to obtain a concentrating concentrate and a concentrating tailings; The roughing agent and the cleaning agent are composed of a combined collector and metal ions; The combined collector consists of a cationic collector and an anionic collector.

2. The method according to claim 1, characterized in that The magnetic field strength of the two-stage strong magnetic separation and impurity removal is 0.6-1.4T.

3. The method according to claim 1, characterized in that The dosage of the combined collector in the roughing agent is 100-600 g / t, and the dosage of the metal ion is 100-500 g / t; the dosage of the combined collector in the fine agent is 50-300 g / t, and the dosage of the metal ion is 50-250 g / t.

4. The method according to claim 1, characterized in that The mass ratio of the cationic collector to the anionic collector is 1-2:2-4.

5. The method according to 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.

6. The method according to claim 1, characterized in that The metal ions include Ca 2+ Mg 2+ , Fe 2+ and Cu 2+ At least one of .

7. The method according to claim 6, characterized in that The Ca 2+ and Mg 2+ Provided by the corresponding metal chloride; the Fe 2+ and Cu 2+ Provided by the corresponding metal sulfates.

8. Use of the method according to any one of claims 1 to 7 in improving the quality of potassium feldspar concentrate after beneficiation of low-grade potassium feldspar ore.

9. A method for improving the quality of potassium feldspar concentrate obtained by beneficiation of low-grade potassium feldspar ore, characterized in that the steps include: The low-grade potassium feldspar ore is subjected to two-stage strong magnetic separation to remove impurities and obtain magnetic separation concentrate; After slurrying the magnetic concentrate to neutrality, a roughing agent is added to perform roughing flotation to obtain a roughing concentrate and a roughing tailing; After slurrying the rougher concentrate to neutrality, a concentrating agent is added to perform concentrating flotation to obtain a concentrating concentrate and a concentrating tailings; The roughing agent and the cleaning agent are composed of a combined collector and metal ions; The combined collector is composed 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 .

10. The method according to claim 9, characterized in that The mass ratio of the cationic collector to the anionic collector is 1-2:2-4.

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