CN111036412B - Application of inhibitor HPMA in positive flotation and magnesium removal of phosphate ore - Google Patents

Application of inhibitor HPMA in positive flotation and magnesium removal of phosphate ore Download PDF

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CN111036412B
CN111036412B CN201911182805.1A CN201911182805A CN111036412B CN 111036412 B CN111036412 B CN 111036412B CN 201911182805 A CN201911182805 A CN 201911182805A CN 111036412 B CN111036412 B CN 111036412B
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flotation
hpma
inhibitor
phosphate
magnesium
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CN111036412A (en
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杨斌
孙浩然
班小淇
印万忠
韩会丽
姚金
曹少航
徐东
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Northeastern University China
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Northeastern University China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/008—Organic compounds containing oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/06—Depressants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores
    • B03D2203/04—Non-sulfide ores
    • B03D2203/06—Phosphate ores

Abstract

An application of HPMA (high efficiency inhibitor) in positive flotation and magnesium removal of phosphate ore belongs to the field of the ore dressing and purification process of phosphate ore. The application is a technological process for removing gangue mineral dolomite by using the high-efficiency inhibitor HPMA in the phosphorite direct flotation. Dissolving the high-efficiency inhibitor HPMA in water to prepare an inhibitor HPMA solution with the mass concentration of 2-4 g/L for use in preparation of the phosphorite flotation ore pulp. Under a sodium oleate or oleic acid flotation system, according to the addition of a high-efficiency inhibitor HPMA (hydrolyzed polymaleic anhydride), the floatability difference of phosphorite (apatite) and gangue mineral (dolomite) in phosphorite is increased, the magnesium-containing mineral (dolomite) in the phosphorite is removed, magnesium impurities are reduced, the quality of low-magnesium phosphate concentrate products is improved, and particularly, a new high-efficiency flotation inhibitor is provided for the flotation separation of high-magnesium low-grade phosphorite.

Description

Application of inhibitor HPMA in positive flotation and magnesium removal of phosphate ore
Technical Field
The invention relates to the technical field of ore dressing and purification processes of phosphate ore, in particular to application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore.
Background
In the process of separating and purifying the phosphate ore, the key for improving the quality of the phosphate ore product is to reduce the MgO content of phosphate concentrate. The MgO impurity in the phosphate ore is mainly derived from magnesium-containing carbonate mineral dolomite. Apatite is a typical useful mineral containing phosphorus of phosphorus ore, but because apatite and gangue dolomite belong to salt minerals containing calcium, the similar physical and chemical properties thereof cause difficulty in flotation separation of apatite and dolomite. In addition, the phosphate ore has the characteristics of poor quality, fineness and impurities, the monomer dissociation of useful phosphorus minerals can be realized only by fine grinding, and the fine dolomite is easy to enter flotation foam in the flotation process to reduce the grade of phosphorus concentrate and increase the difficulty of the subsequent production of phosphorus chemical products. The efficient inhibitor is added in the positive flotation process of the phosphate ore, so that the dolomite flotation can be effectively inhibited, the separation efficiency of the flotation and the magnesium removal of the phosphate ore is improved, and the quality of the phosphate concentrate is improved, therefore, the efficient dolomite selective inhibitor is found to be of great significance for the efficient separation of the phosphate mineral and the dolomite in the phosphate ore.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the application of the inhibitor HPMA in the positive flotation and demagging of phosphate ores, which is to increase the difference of the floatability of phosphorite (apatite) and gangue (dolomite) in the phosphate ores according to the addition of the inhibitor HPMA (hydrolyzed polymaleic anhydride) in a sodium oleate or oleic acid flotation system, remove magnesium-containing minerals (dolomite) in the phosphate ores, reduce magnesium impurities, improve the product quality of low-magnesium phosphate concentrates, and particularly provide a new efficient flotation inhibitor for the flotation and separation of high-magnesium low-grade phosphate ores.
The invention relates to an application of an inhibitor HPMA in direct flotation and magnesium removal of phosphate ore, which is a process for applying the inhibitor HPMA to direct flotation and removal of gangue mineral dolomite of the phosphate ore.
Further, the application of the inhibitor HPMA in the direct flotation and magnesium removal of phosphate ore is to use the inhibitor HPMA in the preparation of phosphate ore flotation pulp.
Further, the application of the inhibitor HPMA in the direct flotation and magnesium removal of phosphate ore is to dissolve the inhibitor HPMA in water to prepare an inhibitor HPMA solution with the mass concentration of 2-4 g/L for use.
The inhibitor HPMA is used for the process of removing gangue mineral dolomite by phosphorite direct flotation, and specifically comprises the following steps:
step 1: ore grinding
Crushing and grinding high-magnesium low-grade phosphate ore to obtain phosphate ore powder; wherein, in the phosphate rock powder, the mass of the phosphate rock powder with the granularity less than or equal to 74 mu m accounts for 75-80% of the total mass of the phosphate rock powder;
step 2: size mixing
Placing the phosphate rock powder into flotation equipment, adding deionized water and an inhibitor HPMA aqueous solution, and stirring and mixing uniformly to obtain phosphate rock flotation pulp; wherein, according to the mass ratio, deionized water: phosphate rock powder (3-7): 1; the mass concentration of the inhibitor HPMA aqueous solution is 2-4 g/L; the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 40-70 mg/L.
And step 3: direct flotation demagging
Adding NaOH solution into the phosphorite flotation pulp at room temperature, adjusting the pH value of the phosphorite flotation pulp to 8.5-11.5, and uniformly stirring to obtain the phosphorite flotation pulp with the pH value of 8.5-11.5;
adding a collecting agent sodium oleate solution or a collecting agent oleic acid solution into phosphate ore flotation pulp with the pH value of 8.5-11.5, uniformly stirring, carrying out direct flotation rough separation and magnesium removal in flotation equipment, adopting a flotation froth scraping mode, wherein the froth scraping time is 4-5 min, obtaining flotation foam, and obtaining tailings as residual products in the flotation equipment; wherein the molar concentration of the collecting agent in the phosphorite flotation pulp is 0.3-0.4 mmol/L, preferably 0.35 mmol/L;
and 4, step 4: flotation froth aftertreatment
And drying the flotation foam to obtain the low-magnesium phosphate concentrate.
In the step 1, the high-magnesium low-grade phosphate ore comprises the following main components in percentage by mass: p2O524-32%, MgO 1.5-7.5%, CaO 40-55%, F not more than 3.5%, SiO2Less than or equal to 1.8 percent, and the balance of inevitable impurities.
In the step 2, the flotation equipment is preferably a hanging-groove type flotation machine, and the rotating speed can be adjusted at 1500-2600 r/min.
In the step 2, the stirring speed of the stirring and the uniform mixing is 1800-2100 r/min, and the stirring time is 2-3 min.
In the step 3, the temperature for direct flotation, roughing and magnesium removal is preferably 21-25 ℃.
In the step 3, the NaOH solution added for adjusting the pH value is preferably added with a NaOH aqueous solution with the mass percentage concentration of 0.4-1.2%.
In the step 3, the mixture is uniformly stirred, the stirring speed is 1800-2100 r/min, and the stirring time is 2-3 min.
In the step 3, the pH value is preferably 10.5.
In the step 3, the magnesium is removed by the direct flotation roughing, and in the process of the direct flotation roughing magnesium removal, the rotating speed is set to be 1800-2100 r/min, preferably 1900 r/min.
In the step 3, the foam scraping is performed once every 10 s.
In the step 3, the collector sodium oleate solution is preferably a sodium oleate solution with a molar concentration of 6-12 mmol/L, and the collector oleic acid solution is an oleic acid solution with a molar concentration of 6-12 mmol/L, wherein the preparation method of the collector sodium oleate solution comprises the following steps: adding solid powder of collecting agent sodium oleate into deionized water, heating to 50-60 ℃, and stirring until the solid powder of collecting agent sodium oleate is completely dissolved to obtain the collecting agent sodium oleate aqueous solution.
By adopting the method, the prepared low-magnesium phosphate concentrate contains P and Mg components, and the mass percent of each component is P2O5≥37.42％，MgO≤1.65％。
In the low-magnesium phosphate concentrate, the recovery rate of apatite is 70-90%, and the removal rate of gangue dolomite in the low-magnesium phosphate concentrate is 80-90%.
The application of the inhibitor HPMA in the direct flotation and magnesium removal of phosphate ore has the main action mechanism that: the inhibitor HPMA has strong affinity to magnesium, can generate chemical action with magnesium ions on the surface of dolomite, and is strongly adsorbed on the surface of the dolomite, so that the adsorption of a collecting agent (sodium oleate or oleic acid) on the dolomite is hindered, the surface hydrophilicity of the dolomite is increased, and the floating of the dolomite is inhibited. In addition, as magnesium ions do not exist on the surface of main phosphorite of phosphorite, the inhibitor HPMA is weakly adsorbed on the surface of the fluorapatite, the adsorption of a collecting agent (sodium oleate or oleic acid) on the surface is hardly influenced, and the phosphorite acted by the collecting agent (sodium oleate or oleic acid) has higher surface hydrophobicity, so that the phosphorite has good flotation performance. Therefore, the addition of the inhibitor HPMA increases the flotation performance difference of dolomite and apatite, so as to realize positive flotation magnesium removal of phosphate ore, and the action mechanism is proved by contact angle and adsorption amount measurement.
The invention provides an application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore, compared with the prior art, the beneficial effects are as follows:
1. the invention develops the application of the novel inhibitor HPMA, and the novel inhibitor HPMA selectively inhibits the magnesium-containing carbonate mineral dolomite, thereby realizing the direct flotation and the magnesium removal of phosphate ore, improving the removal rate of magnesium impurities, simplifying the process flow of the direct flotation and the magnesium removal of phosphate ore, having stable flotation process and simpler operation.
2. The inhibitor HPMA is an environment-friendly agent without nitrogen, phosphorus and sulfur and toxicity, and reduces the harm of agent residue to the environment compared with the traditional inhibitor for flotation and magnesium removal of phosphate ore. In addition, the inhibitor has the advantages of small dosage, low cost, easy commercial availability and convenient industrial production and application.
3. The inhibitor HPMA is a magnesium-philic chelating agent, can easily act on magnesium locus of magnesium-containing carbonate minerals, is applied to the inhibitor of gangue dolomite in the positive flotation process of phosphate ores, increases the floating difference between phosphate ores and dolomite, and provides a novel flotation inhibitor for low-grade phosphate ore flotation and magnesium removal.
Drawings
FIG. 1 is a schematic diagram of a process flow of applying the inhibitor HPMA to direct flotation and magnesium removal of phosphate ore in example 3 of the present invention.
Figure 2 is an XRD pattern of dolomite used in an example of the invention.
FIG. 3 is an XRD pattern of apatite used in examples of the present invention.
Fig. 4 is a graph showing the results of measuring the adsorption amount of the inhibitor HPMA and the mineral contact angle in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The following limited examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
In the following examples, the test methods, unless otherwise specified, are conventional methods; the reagents and materials are commercially available, unless otherwise specified.
In the following examples, in order to clarify the properties of the present invention, the phosphate ore was artificially mixed phosphate ore, in which the sizes of apatite and dolomite are less than or equal to 74 μm and the mass ratio of apatite to dolomite is 7:3, and the purities of dolomite and apatite are 98.39% and 97.36%, respectively, and the XRD patterns thereof are shown in FIG. 2 and FIG. 3.
In some of the following examples, the high-magnesium low-grade phosphate ore was obtained from hong Kong and subjected to elemental analysis according to X-ray fluorescence spectroscopy, the main component of which is, in mass percent, P2O528.89% of CaO, 53.65% of CaO, 3.04% of C, 3.12% of F, Al2O33.78% of Fe2O32.46% of SiO20.57%, MgO 4.26%, K2O is 0.23%.
In the following examples, the inhibitor HPMA is commercially pure, the collector sodium oleate or oleic acid is chemically pure, and the pH adjuster sodium hydroxide is analytically pure.
In the following examples, the reagents used in the tests were, unless otherwise specified, prepared as aqueous solutions of corresponding concentrations using deionized water.
In the following examples, the preparation method of the collector sodium oleate solution used was: adding solid powder of collecting agent sodium oleate into deionized water, heating to 50-60 ℃, and stirring until the solid powder of collecting agent sodium oleate is completely dissolved to obtain the collecting agent sodium oleate aqueous solution.
Example 1
The application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore comprises the following steps:
step 1: size mixing
Placing the artificial mixed phosphate ore sample into a flotation device, namely a hanging-groove type flotation machine, adding deionized water and an inhibitor HPMA solution with the mass concentration of 2g/L, and stirring for 3min at the impeller rotating speed of 1800r/min until the mixture is uniformly mixed to obtain phosphate ore flotation pulp; wherein the mass ratio of the deionized water to the phosphate ore is 6:1, and the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 40 mg/L;
step 2: direct flotation demagging
Adding NaOH aqueous solution with the mass percentage concentration of 1.2% into the phosphorite flotation pulp at the room temperature (21-25 ℃), adjusting the pH value of the phosphorite flotation pulp to 11.5, and stirring for 2min to obtain the phosphorite flotation pulp with the pH value of 11.5;
adding a collecting agent sodium oleate solution with the molar concentration of 6mmol/L into phosphate ore flotation pulp with the pH value of 11.5, stirring for 3min, and performing direct flotation and rough separation to remove magnesium, namely flotation and foam scraping, wherein the foam scraping time is 4 min; wherein the molar concentration of the sodium oleate dosage in the phosphorite flotation ore pulp is 0.3 mmol/L; after finishing the flotation, respectively drying, weighing and testing the grade of a flotation foam product, namely the low-magnesium phosphate concentrate, and a product in a cell, namely tailings, and calculating product indexes; wherein, the flotation foam product after drying and weighing is the low-magnesium phosphate concentrate product.
In the embodiment, the low-magnesium phosphate concentrate contains the following components in percentage by mass: p2O537.95 percent of MgO, 1.65 percent of MgO; the recovery rate of apatite in the low-magnesium phosphate concentrate is 88.89%, and the removal rate of dolomite in the low-magnesium phosphate concentrate is 84.74%.
In this example, the adsorption amounts of the inhibitor HPMA on the apatite and dolomite surfaces and the influence of the addition of the inhibitor HPMA in the sodium oleate system on the contact angles of the apatite and dolomite surfaces were examined, respectively.
The results are shown in FIG. 4, and it can be seen from FIG. 4 that the adsorption amount of the inhibitor HPMA on dolomite is higher than that on apatite, indicating that the inhibitor HPMA is strongly adsorbed on the surface of dolomite, but weakly adsorbed on the surface of apatite. When only collecting agent sodium oleate is added, the contact angles of apatite and dolomite are similar and have larger contact angles, which shows that the two kinds of sodium oleate can be adsorbed on the surfaces of two kinds of minerals, and the surfaces have better hydrophobicity. However, when the inhibitor HPMA and the collector sodium oleate are added, the apatite and dolomite show a large difference in hydrophobicity, which means that there is a significant difference in the adsorption of sodium oleate on the surfaces of the apatite and dolomite. It can be found that the apatite has a less pronounced change in contact angle and still has a larger contact angle, indicating that the addition of the inhibitor HPMA hardly affects the adsorption of sodium oleate on the apatite surface, whereas the contact angle of dolomite is significantly reduced, demonstrating that the addition of the inhibitor HPMA inhibits the adsorption of sodium oleate on the dolomite surface, thereby reducing the dolomite surface hydrophobicity. Therefore, the adsorption difference of the inhibitor HPMA on the surfaces of the apatite and the dolomite influences the adsorption behavior of the sodium oleate on the two minerals, so that the surface hydrophobicity difference is caused, the floatability difference of the two minerals is increased, and the effect of positive flotation and magnesium removal of the phosphate ore is realized.
Example 2
The application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore comprises the following steps:
step 1: size mixing
Placing the artificial mixed phosphate ore sample into a flotation device, namely a hanging-groove type flotation machine, adding deionized water and an inhibitor HPMA solution with the mass concentration of 3g/L, and stirring for 3min at the impeller rotating speed of 2100r/min until the mixture is uniformly mixed to obtain phosphate ore flotation pulp; wherein the mass ratio of the deionized water to the phosphate ore is 6:1, and the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 60 mg/L;
step 2: direct flotation demagging
Adding NaOH aqueous solution with the mass percentage concentration of 0.4% into the phosphorite flotation pulp at the room temperature (21-25 ℃), adjusting the pH value of the phosphorite flotation pulp to 8.5, and stirring for 2min to obtain the phosphorite flotation pulp with the pH value of 8.5;
adding a collecting agent sodium oleate solution with the molar concentration of 9mmol/L into phosphate ore flotation pulp with the pH value of 8.5, stirring for 3min, and performing direct flotation and rough separation to remove magnesium, namely flotation and foam scraping, wherein the foam scraping time is 5 min; wherein the molar concentration of the sodium oleate dosage in the phosphorite flotation ore pulp is 0.35 mmol/L; after finishing the flotation, respectively drying, weighing and testing the grade of a flotation foam product, namely the low-magnesium phosphate concentrate, and a product in a cell, namely tailings, and calculating product indexes; wherein, the flotation foam product after drying and weighing is the low-magnesium phosphate concentrate product.
In this embodiment, the low-magnesium phosphate concentrate contains P and Mg in the following mass percentages: p2O538.15 percent of MgO, 1.12 percent of MgO; the recovery rate of apatite in the low-magnesium phosphate concentrate is 87.40%, and the removal rate of dolomite in the low-magnesium phosphate concentrate is 86.26%.
Example 3
The application of an inhibitor HPMA in the magnesium removal of phosphate ore by direct flotation, the process flow schematic diagram of the application is shown in figure 1, and the method comprises the following steps:
step 1: ore grinding
Crushing and grinding high-magnesium low-grade phosphate ore to obtain phosphate ore powder; wherein, in the phosphate rock powder, the mass of the phosphate rock powder with the granularity less than or equal to 74 μm accounts for 75 percent of the total mass of the phosphate rock powder;
step 2: size mixing
Placing the phosphate rock powder into a flotation device, namely a single-groove flotation machine, adding deionized water and an inhibitor HPMA solution with the mass concentration of 4g/L, and stirring for 3min at the impeller rotating speed of 1900r/min until the mixture is uniformly mixed to obtain phosphate rock flotation pulp; wherein the mass ratio of the deionized water to the phosphate ore is 4:1, and the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 70 mg/L;
and step 3: direct flotation demagging
Adding NaOH aqueous solution with the mass percentage concentration of 0.9% into the phosphorite flotation pulp at the room temperature (21-25 ℃), adjusting the pH value of the phosphorite flotation pulp to 10.5, and stirring for 2min to obtain the phosphorite flotation pulp with the pH value of 10.5;
adding a collecting agent sodium oleate solution with the molar concentration of 12mmol/L into phosphate ore flotation pulp with the pH value of 10.5, stirring for 3min, and performing direct flotation and rough separation to remove magnesium, namely flotation and foam scraping, wherein the foam scraping time is 4.5 min; wherein the molar concentration of the sodium oleate dosage in the phosphorite flotation ore pulp is 0.4 mmol/L; after finishing the flotation, respectively drying, weighing and testing the grade of a flotation foam product, namely the low-magnesium phosphate concentrate, and a product in a cell, namely tailings, and calculating product indexes; wherein, the flotation foam product after drying and weighing is the low-magnesium phosphate concentrate product.
In the embodiment, the low-magnesium phosphate concentrate comprises the following main components in percentage by mass: p2O537.76 percent of MgO, 0.60 percent of MgO; the recovery rate of apatite in the low-magnesium phosphate concentrate is 74.13%, and the removal rate of dolomite in the low-magnesium phosphate concentrate is 89.87%.
Example 4
The application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore comprises the following steps:
step 1: ore grinding
Crushing and grinding high-magnesium low-grade phosphate ore to obtain phosphate ore powder; wherein, in the phosphate rock powder, the mass of the phosphate rock powder with the granularity less than or equal to 74 mu m accounts for 80 percent of the total mass of the phosphate rock powder;
step 2: size mixing
Placing the phosphate rock powder into a flotation device, namely a single-groove flotation machine, adding deionized water and an inhibitor HPMA solution with the mass concentration of 3g/L, and stirring for 3min at the impeller rotating speed of 2000r/min until the mixture is uniformly mixed to obtain phosphate rock flotation pulp; wherein the mass ratio of the deionized water to the phosphate ore is 4:1, and the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 50 mg/L;
and step 3: direct flotation demagging
Adding 0.7 mass percent NaOH dilute solution into the phosphate ore flotation pulp at room temperature (21-25 ℃), adjusting the pH of the phosphate ore flotation pulp to 9.5, and stirring for 2min to obtain the phosphate ore flotation pulp with the pH value of 9.5;
adding a collecting agent sodium oleate solution with the molar concentration of 6mmol/L into phosphate ore flotation pulp with the pH value of 9.5, stirring for 3min, and performing direct flotation and rough separation to remove magnesium, namely flotation and foam scraping, wherein the foam scraping time is 4.5 min; wherein the molar concentration of the sodium oleate dosage in the phosphorite flotation ore pulp is 0.3 mmol/L; after finishing the flotation, respectively drying, weighing and testing the grade of a flotation foam product, namely the low-magnesium phosphate concentrate, and a product in a cell, namely tailings, and calculating product indexes; wherein, the flotation foam product after drying and weighing is the low-magnesium phosphate concentrate product.
In the embodiment, the low-magnesium phosphate concentrate comprises the following main components in percentage by mass: p2O537.44 percent of MgO and 0.74 percent of MgO; the recovery rate of apatite in the low-magnesium phosphate concentrate is 72.13%, and the removal rate of dolomite in the low-magnesium phosphate concentrate is 87.87%.
Example 5
The application of an inhibitor HPMA in positive flotation and magnesium removal of phosphate ore is the same as that in example 4, except that a collecting agent oleic acid solution is adopted to replace a collecting agent sodium oleate solution, and the obtained low-magnesium phosphate concentrate comprises the following main components in percentage by mass: p2O537.42% and 0.70% MgO; the recovery rate of apatite in the low-magnesium phosphate concentrate is 70.03%, and the removal rate of dolomite in the low-magnesium phosphate concentrate is 88.87%.

Claims (7)

1. The application of the inhibitor HPMA in the direct flotation and magnesium removal of phosphate ore is characterized in that the inhibitor HPMA is used in the process of removing gangue mineral dolomite in the direct flotation of the phosphate ore, and the method specifically comprises the following steps:
step 1: ore grinding
Crushing and grinding high-magnesium low-grade phosphate ore to obtain phosphate ore powder; wherein, in the phosphate rock powder, the mass of the phosphate rock powder with the granularity less than or equal to 74 mu m accounts for 75-80% of the total mass of the phosphate rock powder;
step 2: size mixing
Placing the phosphate rock powder into flotation equipment, adding deionized water and an inhibitor HPMA aqueous solution, and stirring and mixing uniformly to obtain phosphate rock flotation pulp; wherein, according to the mass ratio, deionized water: phosphorus ore powder = (3-7): 1; the mass concentration of the inhibitor HPMA aqueous solution is 2-4 g/L; the mass concentration of the inhibitor HPMA in the phosphate ore flotation pulp is 40-70 mg/L;
and step 3: direct flotation demagging
Adding NaOH solution into the phosphorite flotation pulp at room temperature, adjusting the pH value of the phosphorite flotation pulp to 8.5-11.5, and uniformly stirring to obtain the phosphorite flotation pulp with the pH value of 8.5-11.5;
adding a collecting agent sodium oleate solution or a collecting agent oleic acid solution into phosphate ore flotation pulp with the pH value of 8.5-11.5, uniformly stirring, carrying out direct flotation rough separation and magnesium removal in flotation equipment, adopting a flotation froth scraping mode, wherein the froth scraping time is 4-5 min, obtaining flotation foam, and obtaining tailings as residual products in the flotation equipment; wherein the molar concentration of the collecting agent in the phosphorite flotation pulp is 0.3-0.4 mmol/L;
and 4, step 4: flotation froth aftertreatment
And drying the flotation foam to obtain the low-magnesium phosphate concentrate.
2. The application of the inhibitor HPMA in the direct flotation and demagging of phosphate ore according to claim 1, wherein in the step 1, the high-magnesium low-grade phosphate ore contains the following main components in percentage by mass: p2O524-32%, MgO 1.5-7.5%, CaO 40-55%, F not more than 3.5%, SiO2Less than or equal to 1.8 percent, and the balance of inevitable impurities.
3. The application of the inhibitor HPMA in the direct flotation and magnesium removal of phosphate ore according to claim 1, wherein in the step 3, the mass percentage concentration of NaOH aqueous solution added for adjusting the pH value is 0.4-1.2%.
4. The use of the depressant HPMA of claim 1 in positive flotation demagging of phosphate ore, wherein in step 3 flotation froth scraping is performed every 10 s.
5. The application of the inhibitor HPMA in phosphate ore direct flotation demagging as claimed in claim 1, wherein in the step 3, the collector sodium oleate solution is a sodium oleate solution with a molar concentration of 6-12 mmol/L, the collector oleic acid solution is an oleic acid solution with a molar concentration of 6-12 mmol/L, and the preparation method of the collector sodium oleate solution comprises the following steps: adding solid powder of collecting agent sodium oleate into deionized water, heating to 50-60 ℃, and stirring until the solid powder of collecting agent sodium oleate is completely dissolved to obtain the collecting agent sodium oleate aqueous solution.
6. The use of the inhibitor HPMA of claim 1 in the direct flotation of phosphate ore for demagging, wherein the resulting low-magnesium phosphate concentrate has P in it2O5≥37.42%，MgO≤1.65%。
7. The application of the inhibitor HPMA in direct flotation of phosphate ore to remove magnesium according to claim 1, wherein the recovery rate of apatite in the low-magnesium phosphate concentrate is 70-90%, and the removal rate of gangue dolomite in the low-magnesium phosphate concentrate is 80-90%.
CN201911182805.1A 2019-11-27 2019-11-27 Application of inhibitor HPMA in positive flotation and magnesium removal of phosphate ore Expired - Fee Related CN111036412B (en)

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