Synchronous removal inhibitor of low-grade siliceous calcareous collophanite gangue minerals and application

Abstract

The present application relates to a kind of low-grade silicon calcareous collophanite gangue mineral synchronous removal inhibitor and application, the inhibitor includes methylene bis naphthalene sulfonic acid sodium 40~70 parts, polysaccharide polymer 15~30 parts and organic acid 15~30 parts by mass fraction.The inhibitor provided in the present application contains active groups such as sulfonic acid group, hydroxyl group and carboxyl group in raw material, can occur strong adsorption with dolomite, iron-aluminum sesquioxide and activated quartz and other gangue minerals in silicon calcareous collophanite, mask the active site of gangue mineral surface, inhibit the adsorption of collector on the surface of gangue mineral, and by the reasonable proportioning between raw materials, can significantly improve the grade and recovery rate of phosphate concentrate, effectively reduce the content of harmful impurities therein.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral flotation, and particularly relates to a synchronous removal inhibitor for gangue minerals of medium and low grade siliceous-calcic collophanite and application thereof. BACKGROUND

[0002] At present, with the continuous development of phosphate rock resources, the crisis of high-grade phosphate rock resources is highlighted. Less than 10% of phosphate rock resources with P2O5 grade greater than 30%, more than 90% of medium and low grade phosphate rock resources, and more than half of these ores are in the form of siliceous-calcic collophanite, with ore reserves reaching 5 billion tons. Therefore, improving the separation technology of medium and low grade siliceous-calcic collophanite is increasingly important for guaranteeing the safety of national phosphate rock resources and sustainable economic development.

[0003] Medium and low grade collophanite needs to remove impurity gangue minerals such as calcium, magnesium, silicon, iron and aluminum by beneficiation method. These gangue minerals are usually removed by direct-reverse flotation to obtain good phosphate concentrate, but direct-reverse flotation has defects such as complex reagent preparation, large reagent dosage and high energy consumption, which is not conducive to green mine construction. Single direct flotation can efficiently remove complex impurity gangue minerals, avoid equipment corrosion caused by acidic ore slurry in the reverse flotation process and a series of problems such as acid wastewater treatment, and direct flotation conforms to the principle of "inhibiting more and floating less", but the existing inhibitors have poor selectivity, which makes it difficult to realize efficient separation of medium and low grade collophanite, especially the synchronous inhibition of dolomite and iron-aluminum sesquioxide in siliceous-calcic collophanite. Therefore, it is of great significance to develop an economic, efficient and green flotation inhibitor. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies and provide a synchronous removal inhibitor for gangue minerals of medium and low grade siliceous-calcic collophanite and application thereof, which solves the technical problem of poor selectivity of collophanite direct flotation inhibitor in the prior art.

[0005] To achieve the above technical purpose, the technical solution provided by the present application is as follows:

[0006] In a first aspect, the present application provides a synchronous removal inhibitor for gangue minerals of medium and low grade siliceous-calcic collophanite, which comprises, by mass fraction, 40-70 parts of methylene bis-naphthalene sulfonic acid sodium, 15-30 parts of polysaccharide polymer and 15-30 parts of organic acid.

[0007] In a second aspect, the present application provides the use of the above inhibitor in the synchronous removal of gangue minerals of medium and low grade siliceous-calcic collophanite, comprising the following steps:

[0008] (1) grinding the collophanite ore and preparing a slurry by adding water; adjusting the pH of the slurry to alkaline, and then adding the inhibitor and collector for roughing to obtain phosphate rough concentrate and roughing tailings;

[0009] (2) adding an inhibitor into the phosphorus rough concentrate for cleaning to obtain a cleaning tailing and a phosphorus concentrate;

[0010] (3) adding an inhibitor and a collector into the roughing tailing for scavenging to obtain a scavenging tailing and a scavenging concentrate; the scavenging concentrate and the cleaning tailing return to the roughing process.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] In the inhibitor provided by the present application, by adopting 40-70 parts of methylene bis-naphthalene sulfonic acid sodium, 15-30 parts of polysaccharide polymer and 15-30 parts of organic acid, the raw materials contain active groups such as sulfonic acid group, hydroxyl group and carboxyl group, which can strongly adsorb the gangue minerals such as dolomite, iron-aluminum sesquioxide and activated quartz on the surface of the siliceous-calcic collophanite, mask the active sites on the surface of the gangue minerals and inhibit the adsorption of the collector on the surface of the gangue minerals, and through the reasonable proportioning of the raw materials, the grade and recovery rate of the phosphorus concentrate can be significantly improved and the content of harmful impurities can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a process flow diagram of the present application. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0015] The present application provides a kind of low-grade siliceous-calcic collophanite gangue mineral synchronous removal inhibitor and application, to solve the problem of poor selectivity of collophanite direct flotation inhibitor, the inhibitor has high selectivity, process flow is simple, and flotation separation effect is good, which helps to greatly improve the quality of phosphorus concentrate, and is worth large-scale popularization and application.

[0016] In the first aspect, the present application provides a kind of low-grade siliceous-calcic collophanite gangue mineral synchronous removal inhibitor, by mass parts, including 40-70 parts of methylene bis-naphthalene sulfonic acid sodium, 15-30 parts of polysaccharide polymer and 15-30 parts of organic acid.

[0017] Preferably, the polysaccharide polymer is at least one of carboxymethyl inulin, carboxylated chitosan, gum arabic, corn starch, xanthan gum and pectin.

[0018] Preferably, the organic acid is at least one of a series of non-toxic and harmless small molecular organic acids, specifically citric acid, malic acid, fumaric acid, fulvic acid and phytic acid.

[0019] Further preferably, the siliceous-calcareous collophanite flotation depressant comprises 55-65 parts by mass of methylene bis-naphthalene sulfonic acid sodium salt, 20-25 parts by mass of polysaccharide polymer, and 15-20 parts by mass of small-molecule organic acid.

[0020] Further preferably, the siliceous-calcareous collophanite flotation depressant comprises 55-65 parts by mass of methylene bis-naphthalene sulfonic acid sodium salt, 20-25 parts by mass of polysaccharide polymer, and 15-20 parts by mass of small-molecule organic acid.

[0021] Further preferably, the siliceous-calcareous collophanite flotation depressant comprises 55-65 parts by mass of methylene bis-naphthalene sulfonic acid sodium salt, 20-25 parts by mass of polysaccharide polymer, and 15-20 parts by mass of small-molecule organic acid.

[0022] Further preferably, the siliceous-calcareous collophanite flotation depressant comprises 55-65 parts by mass of methylene bis-naphthalene sulfonic acid sodium salt, 20-25 parts by mass of polysaccharide polymer, and 15-20 parts by mass of small-molecule organic acid.

[0023] In a second aspect, referring to Figure 1 The present application provides a use of the above-mentioned depressant in simultaneously removing gangue minerals from low-to-medium grade siliceous-calcareous collophanite, comprising the following steps:

[0024] (1) grinding the collophanite ore and preparing a slurry by adding water; adjusting the pH of the slurry to alkaline, then adding the depressant, and after fully mixing, adding the collector for roughing to obtain a flotation froth product-phosphorus rough concentrate and a tank product-roughing tailings;

[0025] (2) adding the depressant to the phosphorus rough concentrate for cleaning to obtain a tank product-cleaning tailings and a froth product-phosphorus concentrate;

[0026] (3) adding the depressant and the collector to the roughing tailings for scavenging to obtain a tank product-scavenging tailings and a flotation froth product-scavenging concentrate; the scavenging concentrate and the cleaning tailings are returned to the roughing process.

[0027] Preferably, in the collophanite ore of step (1), the P2O5 grade is 20-30%, the magnesium oxide content is 1-4%, the sesquioxide content is 3-6%, and the SiO2 content is 12-25%. The sesquioxide is A2O3, and A represents Fe or Al.

[0028] Preferably, in step (1), the collophanite ore is ground to more than 80% of -0.074 mm, and a slurry of 20-45% wt is prepared by adding water.

[0029] Preferably, in step (1), the pH regulator is used to adjust the pH value of the ore slurry A to 8-11, and more preferably to 9-11; the pH regulator is one or both of sodium carbonate and sodium bicarbonate.

[0030] Preferably, the dosage of the depressant in step (1) is 150-500 g / t, and more preferably 200-400 g / t, and even more preferably 250-300 g / t; the dosage of the depressant in step (2) is 20-100 g / t, and more preferably 40-60 g / t, and most preferably 50 g / t; the dosage of the depressant in step (3) is 120-150 g / t, and more preferably 120 g / t.

[0031] Preferably, the collector is a mixture of fatty acids and sodium petroleum sulfonate, and more specifically, sodium oleate and sodium petroleum sulfonate are mixed in a ratio of 1:1.

[0032] Preferably, the dosage of the collector in step (1) is 200-300 g / t, and the dosage of the collector in step (3) is 100-150 g / t.

[0033] Preferably, the dosage of the depressant and the dosage of the collector are both relative to the collophanite ore.

[0034] Preferably, after the depressant and / or the collector are added in steps (1)-(3), the mixture is stirred uniformly, and then is scraped for 1-10 min; more preferably, the scraping time in roughing is 3-6 min, the scraping time in cleaning is 1-4 min, and the scraping time in scavenging is 2-5 min.

[0035] More preferably, after the depressant and / or the collector are added in steps (1)-(3), the mixture is stirred for 2-5 min, respectively.

[0036] Main mechanism and advantages of the present application:

[0037] (1) The depressant provided by the present application contains sulfonic acid groups, the carboxymethyl inulin contains hydroxyl and carboxyl groups, and the phytic acid contains multiple hydroxyl groups, which can strongly adsorb to the surfaces of gangue minerals such as dolomite, iron-aluminum sesquioxide and activated quartz in the siliceous-calcic collophanite, mask the active sites on the surfaces of the gangue minerals, and inhibit the adsorption of the collector on the surfaces of the gangue minerals, so that the grade and the recovery rate of the phosphate concentrate can be significantly improved.

[0038] (2) The process for synchronously removing the gangue minerals in the medium-low grade collophanite provided by the present application is simple and easy to operate, forms a short process, and is a high-efficiency, stable and reliable process for running the medium-low grade siliceous-calcic collophanite flotation reagent system. Compared with the existing reagent system, the process can significantly reduce the dosage of the flotation reagent and the energy consumption, and reduce the beneficiation cost.

[0039] (3) The inhibitor of the present application has the characteristics of multiple inhibition properties, low reagent consumption, and high selectivity, forming a short process for simultaneous removal of harmful impurity minerals such as magnesium, iron, aluminum, and silicon, with low beneficiation cost and significant economic benefits, and is particularly suitable for low-grade siliceous calcareous collophanite.

[0040] The present application will be further described in detail below through specific examples. To avoid repetition, the related raw materials in the examples of the present application are described as follows: both the inhibitor and the collector are prepared into a solution with a concentration of 30-50 wt% for subsequent use, and the specific amount is based on the inhibitor and the collector themselves.

[0041] For example, 280 g / t of collophanite flotation inhibitor is added, which means that 280 g of inhibitor (a mixture of methylene bis-naphthalene sulfonic acid sodium, polysaccharide polymer, and organic acid) is added per ton of collophanite ore, and the addition form is to prepare the inhibitor into a 30-40 wt% solution before use.

[0042] Example 1

[0043] In this example, the siliceous calcareous collophanite flotation inhibitor (KN-16) used is composed of the following components in mass fraction: methylene bis-naphthalene sulfonic acid sodium 60 parts, polysaccharide polymer 20 parts, and small molecule organic acid 20 parts. Among them, the polysaccharide polymer is carboxymethyl inulin, and the small molecule organic acid is phytic acid.

[0044] The collector is a mixture of fatty acids and petroleum sulfonate sodium, specifically a mixture of sodium oleate and petroleum sulfonate sodium in a ratio of 1:1.

[0045] The collophanite ore in this example is from a low-grade siliceous calcareous collophanite sample in Guizhou, with a P2O5 grade of 22.06%, a SiO2 content of 21.59%, a MgO content of 2.86%, and a sesquioxide A2O3 content of 4.89% (A represents Fe and Al); and is processed according to the following application steps:

[0046] (1) The collophanite ore is ground to 81.05% of the original ore mass with a particle size of -0.074 mm, the pulp concentration is adjusted to 30% by adding water, the pulp pH is adjusted to 9.5 by adding sodium carbonate, 280 g / t of collophanite flotation inhibitor is added, and then 260 g / t of collector is added, and after stirring for 3 minutes each time, the roughing is carried out, the froth time is 4-5 minutes, and the floating froth product - phosphorus rough concentrate and the tank product - roughing tailings are obtained;

[0047] (2) The froth product phosphorus rough concentrate is subjected to cleaning, and 50 g / t of collophanite depressant is added in the cleaning process, and after stirring for 3 min, the froth is scraped for 2-3 min to obtain the in-tank product, i.e. cleaning tailings, and the froth product, i.e. phosphorus concentrate;

[0048] (3) The cleaning tailings product is subjected to scavenging, and 120 g / t of collophanite depressant and 140 g / t of collector are added in the scavenging process, and after stirring for 3 min, the froth is scraped for 3-4 min to obtain the in-tank product, i.e. scavenging tailings, and the froth product, i.e. scavenging concentrate; the scavenging tailings are subjected to discarding treatment, and the scavenging concentrate product and the cleaning tailings product are returned to the roughing process.

[0049] In the above embodiment, a phosphorus concentrate product with a P2O5 grade of 35.56%, MgO content of 0.91%, SiO2 content of 6.35%, A2O3 content of 1.93%, and phosphorus recovery rate of 85.12% is finally obtained; the product meets the requirements of a first-class phosphorus concentrate raw material for wet-process phosphoric acid preparation, and effectively solves the problem of simultaneous removal of harmful impurities such as silicon, magnesium, iron and aluminum in medium and low-grade siliceous-calcic collophanite.

[0050] Comparative Example 1

[0051] The other conditions are completely consistent with those in Example 1, except that common sodium silicate is used as the depressant.

[0052] A phosphorus concentrate product with a P2O5 grade of 30.28%, MgO content of 3.95%, SiO2 content of 7.12%, A2O3 content of 3.05%, and phosphorus recovery rate of 80.23% is finally obtained.

[0053] Comparative Example 2

[0054] The other conditions are completely consistent with those in Example 1, except that only the methylene bis-naphthalene sulfonic acid sodium in KN-16 is used as the depressant.

[0055] A phosphorus concentrate product with a P2O5 grade of 31.01%, MgO content of 0.93%, SiO2 content of 7.38%, A2O3 content of 3.19%, and phosphorus recovery rate of 79.23% is finally obtained.

[0056] Comparative Example 3

[0057] The other conditions are completely consistent with those in Example 1, except that only the carboxymethyl inulin in KN-16 is used as the depressant.

[0058] A phosphorus concentrate product with a P2O5 grade of 26.01%, MgO content of 4.20%, SiO2 content of 8.26%, A2O3 content of 3.01%, and phosphorus recovery rate of 83.12% is finally obtained.

[0059] Comparative Example 4

[0060] All other conditions are completely consistent with Example 1, the difference is that only the phytic acid in KN-16 is used as the inhibitor.

[0061] Finally, the P2O5 grade is 25.89%, the MgO content is 3.25%, the SiO2 content is 8.21%, the A2O3 content is 3.31%, the phosphorus recovery rate is 76.62%, and the phosphate concentrate product is obtained.

[0062] Comparative Example 5

[0063] All other conditions are completely consistent with Example 1, the difference is that only the methylene bis-naphthalene sulfonic acid sodium and carboxymethyl inulin in KN-16 are used as the inhibitor.

[0064] Finally, the P2O5 grade is 33.56%, the MgO content is 1.02%, the SiO2 content is 6.98%, the A2O3 content is 2.59%, the phosphorus recovery rate is 82.16%, and the phosphate concentrate product is obtained.

[0065] Comparative Example 6

[0066] All other conditions are completely consistent with Example 1, the difference is that only the methylene bis-naphthalene sulfonic acid sodium and phytic acid in KN-16 are used as the inhibitor.

[0067] Finally, the P2O5 grade is 33.75%, the MgO content is 0.98%, the SiO2 content is 8.23%, the A2O3 content is 3.21%, the phosphorus recovery rate is 80.56%, and the phosphate concentrate product is obtained.

[0068] Comparative Example 7

[0069] All other conditions are completely consistent with Example 1, the difference is that only the carboxymethyl inulin and phytic acid in KN-16 are used as the inhibitor.

[0070] Finally, the P2O5 grade is 27.26%, the MgO content is 2.98%, the SiO2 content is 8.03%, the A2O3 content is 2.86%, the phosphorus recovery rate is 82.51%, and the phosphate concentrate product is obtained.

[0071] Example 2

[0072] In this example, the siliceous calcium phosphate flotation inhibitor used is composed of the following components in mass fraction:

[0073] Methylene bis-naphthalene sulfonic acid sodium 60 parts, polysaccharide polymer 20 parts, and small molecule organic acid 20 parts. Among them, the polysaccharide polymer is carboxymethyl inulin, and the small molecule organic acid is phytic acid.

[0074] The collector is a mixture of fatty acid and petroleum sulfonate sodium, and specifically, sodium oleate and petroleum sulfonate sodium are mixed in a ratio of 1:1.

[0075] The raw phosphate ore in the embodiment is from a low-grade siliceous-calcareous phosphate ore sample in Hubei, with P2O5 grade of 25.06%, SiO2 content of 18.23%, MgO content of 2.07%, and sesquioxide A2O3 content of 4.89%. The raw ore is processed according to the following steps:

[0076] (1) The raw phosphate ore is ground to 85.29% of the mass of the raw ore with a particle size of 0.074 mm, water is added to adjust the pulp concentration to 33%, sodium carbonate is used to adjust the pH value of the pulp to 10, 260 g / t of phosphate ore flotation depressant is added, and then 270 g / t of collector is added for roughing. After stirring for 3 minutes, roughing is performed, and the scraping time is 4-5 minutes. The floating foam product is a rough phosphate concentrate, and the product in the tank is a roughing tailing;

[0077] (2) The foam product, the rough phosphate concentrate, is subjected to cleaning. In the cleaning process, 50 g / t of phosphate ore depressant is added, and after stirring for 3 minutes, the floating scraping time is 2-3 minutes. The product in the tank is a cleaning tailing, and the foam product is a phosphate concentrate;

[0078] (3) The roughing tailing product is subjected to scavenging. In the scavenging process, 130 g / t of phosphate ore depressant and 130 g / t of collector are added, and after stirring for 3 minutes, the scavenging is performed. The scraping time is 3-4 minutes. The product in the tank is a scavenging tailing, and the floating foam product is a scavenging concentrate. The scavenging tailing is subjected to discarding treatment, and the scavenging concentrate product and the cleaning tailing product are returned to the roughing process.

[0079] In the above embodiment, a phosphate concentrate product with P2O5 grade of 35.78%, MgO content of 0.52%, SiO2 content of 6.35%, and A2O3 content of 1.87% is obtained, and the phosphate recovery rate is 83.58%. The product meets the requirements of a first-class phosphate concentrate for wet-process phosphoric acid preparation, and effectively solves the problem of simultaneous removal of harmful impurities such as silicon, magnesium, iron, and aluminum in low-grade siliceous-calcareous phosphate ore.

[0080] Comparative Example 8

[0081] The other conditions are completely consistent with those in Example 2, except that the proportion of the reagents in KN-16 is changed. Specifically, the reagents are composed of 30 parts of sodium methylene bis naphthalene sulfonate, 50 parts of carboxymethyl inulin, and 20 parts of phytic acid.

[0082] Finally, the P2O5 grade of the product is 30.26%, the MgO content is 1.68%, the SiO2 content is 7.13%, the A2O3 content is 2.36%, the phosphorus recovery rate is 81.51%, and the phosphorus concentrate product is obtained.

[0083] The main conditions and test results of Examples 1-2 and Comparative Examples 1-8 are statistically analyzed, and the results are shown in Table 1.

[0084] Table 1 Main conditions and test results of Examples 1-2 and Comparative Examples 1-8

[0085]

[0086] From Table 1, it can be seen that:

[0087] (1) The P2O5 grade and recovery rate of the phosphorus concentrate obtained by using the siliceous-calcic collophanite flotation depressant provided in Example 1 are higher than those of Comparative Examples 1-7. The harmful impurities of silicon dioxide, magnesium oxide and iron aluminum sesquioxide in the phosphorus concentrate of Example 1 are lower than those of Comparative Examples 1-7, and the removal rates of the harmful impurities of silicon dioxide, magnesium oxide and iron aluminum sesquioxide are higher than those of Comparative Examples 1-7. The simultaneous inhibition effect of the reagent scheme in Example 1 on complex gangue minerals is significant.

[0088] (2) Specifically, the P2O5 grade and recovery rate of the phosphorus concentrate obtained by using the siliceous-calcic collophanite flotation depressant provided in Example 1 are higher than those of Comparative Examples 1-7. Compared with the phosphorus concentrate obtained by using a single depressant, the harmful impurities of silicon dioxide, magnesium oxide and iron aluminum sesquioxide in the phosphorus concentrate of Example 1 are significantly lower than those of Comparative Examples 1-7, and the removal rates of the harmful impurities of silicon dioxide, magnesium oxide and iron aluminum sesquioxide are significantly higher than those of Comparative Examples 1-7. Moreover, the flotation indexes of the phosphorus concentrate obtained in Example 1 are also better than the flotation indexes obtained by using any combination of other reagents. This shows that the siliceous-calcic collophanite flotation depressant provided in the present application can significantly improve the grade and recovery rate of the phosphorus concentrate and reduce the content of harmful impurities therein by combining methylene bisnaphthalene sulfonic acid sodium, carboxymethyl inulin and phytic acid. The effect is better than that of the conventional depressant sodium silicate, and the effect of using a single depressant and a two-depressant combination in KN-16. This shows that the depressant can produce a synergistic effect in selectively inhibiting multiple gangue minerals during the flotation process.

[0089] (3) Further, the siliceous-calcic collophanite flotation depressant provided by embodiment 2, the flotation obtains the P2O5% grade and recovery rate of the phosphate concentrate higher than that of comparative example 8. The silica, magnesium oxide and iron aluminum sesquioxide harmful impurities in the phosphate concentrate of embodiment 2 are significantly lower than those of comparative example 8, and the removal rates of silica, magnesium oxide and iron aluminum sesquioxide harmful impurities are significantly higher than those of comparative example 8. This shows that the siliceous-calcic collophanite flotation depressant provided by the application can significantly improve the grade and recovery rate of the phosphate concentrate and reduce the content of harmful impurities therein by reasonably matching sodium methylene bisnaphthalene sulfonate, carboxymethyl inulin and phytic acid.

[0090] (4) The application proposes to use a new depressant KN-16 to simultaneously remove multiple gangue minerals in siliceous-calcic collophanite, and through the synergistic effect between different depressants, the harmful impurity minerals of silicon, magnesium, iron and aluminum are simultaneously inhibited, which significantly reduces the consumption of flotation reagents and energy consumption, forms a high-efficiency short-flow separation technology, and has great significance for the development and utilization of medium-low grade siliceous-calcic collophanite resources.

[0091] Compared with the prior art, the application provides a siliceous-calcic collophanite gangue mineral synchronous removal depressant and application. The depressant comprises, in mass fraction, 40-70 parts of sodium methylene bisnaphthalene sulfonate, 15-30 parts of a polysaccharide polymer and 15-30 parts of an organic acid. The application specifically comprises the following steps: grinding and water adding to obtain preselected slurry, adjusting the pH value of the slurry to 8-11, adding the collophanite flotation depressant, fully stirring and uniformly mixing, and then adding a collector for roughing, and performing cleaning on the rough concentrate to obtain a phosphate concentrate product. The depressant components are reasonably designed, the depressant has the advantages of high selectivity, low dosage, strong inhibition capacity, easy operation and management, and can simplify the phosphate flotation process, realize synchronous inhibition of multiple gangue minerals in siliceous-calcic collophanite, and is convenient for large-scale industrial application.

[0092] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the application. Any various other corresponding changes and modifications made according to the technical concept of the application shall be included in the scope of protection of the claims of the application.

Claims

1. A depressant for simultaneous removal of gangue minerals of medium-low grade siliceous calcareous collophanite, characterized in that, The sodium methylene bis-naphthalene sulfonate is 40-70 parts by mass, the polysaccharide polymer is 15-30 parts by mass, and the organic acid is 15-30 parts by mass; ​ The polysaccharide polymer is at least one of carboxymethyl inulin, carboxylated chitosan, gum arabic, corn starch, xanthan gum and pectin; The organic acid is at least one of citric acid, malic acid, fumaric acid, fulvic acid and phytic acid.

2. The use of the depressant according to claim 1 for the simultaneous removal of gangue minerals from low and medium grade siliceous and calcareous collophanite veins, characterized in that, The method comprises the following steps: (1) grinding the collophanite raw ore, adding water to prepare a slurry, adjusting the pH of the slurry to alkaline, and then adding an inhibitor and a collector for rough separation to obtain a phosphorus rough concentrate and a rough separation tailing; (2) adding an inhibitor to the phosphorus rough concentrate for fine separation to obtain a fine separation tailing and a phosphorus concentrate; (3) adding an inhibitor and a collector to the rough separation tailing for scavenging separation to obtain a scavenging separation tailing and a scavenging separation concentrate; the scavenging separation concentrate and the fine separation tailing are returned to the rough separation process.

3. Use according to claim 2, characterized in that, In the collophanite raw ore of step (1), the P2O5 grade is 20%-30%, the magnesium oxide content is 1-4%, the sesquioxide content is 3-6%, and the SiO2 content is 12-25%.

4. Use according to claim 2, characterized in that, In step (1), the collophanite raw ore is ground to more than 80% of -0.074 mm, and water is added to prepare a 20-45%wt slurry.

5. Use according to claim 2, characterized in that, In step (1), a pH adjusting agent is used to adjust the pH of the slurry A to 8-11; the pH adjusting agent is one or both of sodium carbonate and sodium bicarbonate.

6. Use according to claim 2, characterized in that, The inhibitor dosage in step (1) is 150-500g / t relative to the collophanite raw ore; the inhibitor dosage in step (2) is 20-100g / t; and the inhibitor dosage in step (3) is 120-150g / t.

7. Use according to claim 2, characterized in that, The collector is a mixture of fatty acids and petroleum sodium sulfonate; the collector dosage in step (1) is 200-300g / t relative to the collophanite raw ore, and the collector dosage in step (3) is 100-150g / t.

8. The use according to claim 2, characterized in that, In steps (1)-(3), after adding the inhibitor and / or the collector, stirring is performed until uniform, and then defoaming is performed for 1-10min.

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