Preparation of an inhibitor dyl and its use in a method for desilication and decalcification of magnesite by direct flotation

Abstract

The application provides a preparation of an inhibitor DYL and a method of the inhibitor DYL for desilication and calcium removal in positive flotation of magnesite, and belongs to the technical field of positive flotation separation and purification of magnesite. The application provides a new inhibitor for synchronous desilication and calcium removal in positive flotation of magnesite and a method of application of the inhibitor in positive flotation of magnesite. The inhibitor DYL is a compound of HCA (hydroxyl citric acid) and curdlan at a mass ratio of 1:1. In the process of desilication and calcium removal in positive flotation of magnesite, the inhibitor is used for flotation separation of magnesite, dolomite and talc. The inhibitor DYL can simultaneously remove ores containing calcium and silicon, simplifies the operation steps in actual production, reduces production investment, combines the inhibitors for inhibiting silicon and calcium into one step for addition, and can greatly improve the ore dressing efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magnesite direct flotation separation and purification, and particularly relates to a preparation of an inhibitor DYL and a method for removing silicon and calcium from magnesite by direct flotation. BACKGROUND

[0002] Magnesium is one of the light metals with the largest total resources on the earth, and has a density of 1.74 g / cm 3 , certain ductility and heat dissipation. Its damping performance is superior, and it has high specific strength and is easy to recycle and reuse, so that magnesium, magnesium alloy and magnesium products are widely used in refractory materials, medical treatment, military industry, aviation, automobile and instrument fields.

[0003] One of the main sources of the magnesium industry chain is magnesite. Magnesite is an advantageous mineral resource in China, and 80% to 90% of the magnesite is used to manufacture refractory materials, which has high development and utilization value. At present, the magnesite sold by enterprises in China mainly is low-end product, and the research and development technology for high-end product with high purity is not mature enough, so that rich ore is continuously mined in recent years, low-grade magnesite is discarded, and high-quality magnesite is almost exhausted. The exploitation and utilization of low-grade magnesite resources have become the most important development trend at present, and therefore, it is of great significance to improve the beneficiation technology, change the low-grade magnesite into valuable resources, solve the shortage of high-grade magnesite resources and promote the sustainable development of magnesite resources.

[0004] Most of the domestic concentrators adopt the flotation method to separate the magnesite, and the main purification task of the magnesite is to remove the calcium carbonate and silicate minerals in the ore, that is, to remove the calcium carbonate gangue mineral such as dolomite and calcite, and the silicate mineral such as quartz, talc and serpentine. The calcium carbonate gangue will form calcium silicate after calcination, and the refractory material will be easily broken when cooling down. The silicate mineral will form fusible silicate in the subsequent calcination process, and the strength of the refractory material will be reduced. Therefore, the calcium-containing gangue and silicon-containing gangue determine the separation quality of the magnesite to a great extent. The mass fraction of CaO and SiO2 in the third-grade magnesite is required to be less than 1.5%, and the mass fraction of CaO and SiO2 in the special-grade magnesite is required to be less than 0.6%. In actual production, the amine collector is generally used for reverse flotation to remove part of the silicon-containing gangue, so as to reduce the purification pressure of the subsequent direct flotation of the magnesite, and the inhibitor for inhibiting silicon and calcium is used in the direct flotation to further purify the magnesite, so that a good separation effect can be obtained.

[0005] With the bauxite ore fine miscellaneous, the ore separation difficulty is further increased, therefore, it is very important to develop a new type of high efficiency flotation reagent applied to bauxite beneficiation. The depressor (referred to as DYL) not only has good inhibitory effect on calcium-containing and silicon-containing gangue minerals, but also has profound reference value in simplifying the flotation process, reducing production cost, solving the problem of high-grade bauxite resource shortage and promoting the sustainable development of bauxite resources in production operation. SUMMARY

[0006] The purpose of the present application is to provide a new type of depressor for bauxite direct flotation synchronous desiliconization and calcium and its application method in bauxite direct flotation. The depressor DYL is compounded with HCA (hydroxyl citric acid) and dextrin at a mass ratio of 1:1. In the direct flotation process, the calcium-containing gangue minerals and silicon-containing gangue minerals can be effectively inhibited at the same time, and the concentrate can have high purity and recovery rate.

[0007] The method for using the depressor DYL in bauxite direct flotation synchronous desiliconization and calcium is used as a depressor for bauxite, dolomite and talc flotation separation in the process of bauxite direct flotation desiliconization and calcium flotation.

[0008] A preparation method of a depressor DYL comprises the following steps:

[0009] The HCA solid powder is dissolved in deionized water, and after constant volume, an HCA dilute solution with a mass concentration of 0.5% to 5% is prepared. The dextrin solid powder is added with sodium hydroxide, and after adding deionized water, it is put into a constant temperature water bath pot and heated to dissolve the dextrin solid powder. After constant volume, a dextrin dilute solution with a mass concentration of 0.5% to 5% is prepared. Finally, the HCA dilute solution and the dextrin dilute solution with the same mass concentration are mixed at a mass ratio of 1:1 to obtain the depressor DYL.

[0010] Further, the amount of sodium hydroxide added is 10% to 30% of the mass of the dextrin solid powder, and the temperature of the constant temperature water bath pot is kept between 50 DEG C and 90 DEG C.

[0011] A method for using a depressor DYL in bauxite direct flotation desiliconization and calcium comprises the following steps:

[0012] S1: Take the bauxite pure mineral in the particle size interval of -74+38 μm, add deionized water to dissolve, and prepare the ore slurry for flotation test, and put it into a flotation tank;

[0013] S2: Put the flotation tank containing the ore slurry on the flotation machine to stir, so that the pure mineral particles are uniformly distributed in the ore slurry;

[0014] S3: adjust the ore slurry to a set pH value with an HCl solution or a NaOH solution, and stir for 1-3 min at the pH value;

[0015] S4: add an inhibitor DYL, and allow the reagent to fully react with the mineral surface for 1-3 min;

[0016] S5: add a collector, and allow the reagent to fully react with the mineral surface for 1-3 min, the collector being one or two of sodium oleate, oxidized paraffin soap, petroleum sulfonate sodium, and benzenecarboxyhydroxamic acid, and the pH value being kept constant during the addition of the reagent;

[0017] S6: after the reagent fully acts, manually scrape the froth for 3-5 min, and then put the obtained froth product and tank bottom product into an oven for drying, weighing, calculating the recovery rate, and testing the MgO, CaO, and SiO2 contents.

[0018] In the step S1, the pure mineral MgO content of the magnesite is 43.1%-47.8% by weight, the CaO content is 0.1%-0.6% by weight, the SiO2 content is 0.01%-0.2% by weight, the Al2O3 content is 0.1%-0.3% by weight, and the TFe content is 0.1% by weight; and the pure mineral SiO2 content of the talc is 61.78%-63.37% by weight, the MgO content is 31.01%-31.88% by weight, the Al2O3 content is 0.1%-0.2% by weight, and the TFe content is 0.1% by weight.

[0019] In the step S1, the pure mineral of the magnesite is selected from one or more of magnesite, dolomite, and talc, and when multiple minerals are added, the mass ratio of the magnesite, the dolomite, and the talc is (1-16):1:1.

[0020] In the step S1, the concentration of the ore slurry is 0.050-0.080 g / mL.

[0021] In the step S2, the stirring speed of the flotation machine is 1900-2100 r / min, and the stirring time is 1-3 min.

[0022] In the step S3, the mass concentration of the HCl solution is 0.1%-5%, and the mass concentration of the NaOH solution is 0.1%-5%; and the pH value ranges from 7 to 12.

[0023] In the step S4, the amount of the inhibitor DYL is 100-350 mg / L.

[0024] The amount of sodium oleate in the step S5 is 33-150 mg / L, the amount of oxidized paraffin soap is 120 mg / L-150 mg / L, the amount of sodium petroleum sulfonate is 210 mg / L-360 mg / L, and the amount of benzohydroxamic acid is 100 mg / L-150 mg / L.

[0025] In the single mineral test by using the method, the magnesite yield is 71.0%-98.4%, and the talc yield is 0.3%-94.4%;

[0026] In the mixed mineral test by using the method, the concentrate yield is 62.91%-86.79%, the MgO content is 46.9%-47.8%, the SiO2 content is 0.1%-0.2%, the CaO content is 0.1%-0.2%, and the MgO recovery rate is 88.9%-93.2%.

[0027] The inhibitor in the application can play the synergistic effect of HCA and curdlan by compounding, and the gangue minerals containing calcium and silicon can be well inhibited, and the influence on the floatability of magnesite is small, so that the application of DYL in positive flotation can improve the beneficiation efficiency and realize one-step removal of CaO and SiO2.

[0028] Compared with the prior art, the application has the beneficial effects that:

[0029] 1) The inhibitor DYL selected in the application has high selective inhibition effect on the gangue minerals containing silicon and calcium in positive flotation, and has little influence on the floatability of magnesite, so that the high recovery rate of magnesite is ensured, and the high-efficiency separation of magnesite has important reference value.

[0030] 2) The inhibitor DYL selected in the application can inhibit the floating of the gangue minerals containing calcium and silicon in positive flotation, compared with HCA, HCA can only remove the gangue containing calcium, and another reagent needs to be added to remove the gangue containing silicon, but DYL can remove the gangue containing calcium and silicon at the same time, which simplifies the operation steps in actual production, reduces the production investment, and combines the inhibitors for inhibiting silicon and calcium in one step, so that the beneficiation efficiency can be greatly improved.

[0031] 3) The inhibitor DYL selected in the application is a new reagent compounded by two reagents HCA and curdlan, and HCA and curdlan are used in the food industry, so the reagent DYL is environmentally friendly and has no harm to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flow chart of the method for using the inhibitor DYL for synchronous desiliconization and decalcification of magnesite in positive flotation;

[0033] Figure 2 The relationship between pH value and recovery rate in Example 1 of the present application;

[0034] Figure 3 The relationship between the dosage of inhibitor DYL and the recovery rate in Example 2 of the present application. DETAILED DESCRIPTION

[0035] The present application will be further described in conjunction with the examples below, but the examples are not a limitation on the technical solutions of the present application. In the following examples, the test methods are conventional methods unless otherwise specified; and the reagents and materials are commercially available unless otherwise specified.

[0036] In order to better explain the present application, the main contents of the present application will be further illustrated in conjunction with specific laboratory examples below, but the contents of the present application are not limited to the following examples.

[0037] Example 1

[0038] A preparation method of an inhibitor DYL, comprising the following steps:

[0039] The HCA solid powder is dissolved in deionized water, and after constant volume, a 50ml HCA dilute solution with a mass concentration of 0.5% is prepared; sodium hydroxide is added to the gellan gum solid powder, and after adding deionized water, the gellan gum solid powder is heated in a constant temperature water bath to dissolve, and after constant volume, a 50ml gellan gum dilute solution with a mass concentration of 0.5% is prepared. Finally, the HCA dilute solution and the gellan gum dilute solution with the same mass concentration are mixed and constant volume to 100ml to obtain the inhibitor DYL with a mass concentration of 1%.

[0040] A method for removing silicon and calcium by positive flotation of magnesite using an inhibitor DYL, comprising the following steps:

[0041] 2.0g of magnesite, dolomite and talc with particle size in the range of-74+38μm are weighed and respectively subjected to flotation, dissolved in 30ml of deionized water, and put into a 50ml flotation tank for stirring to uniformly disperse the mineral particles in the slurry.

[0042] The pH value of the slurry is adjusted to 7, 8, 9, 10, 11 and 12 respectively, and stirred for 2min, and 100mg / L of the inhibitor DYL and 100mg / L of the collector sodium oleate are sequentially added to the slurry according to the order shown in Figure 1 The stirring time is 3min, and the pH value of the slurry is kept constant during the addition of the reagents. After the reagents fully act, the foam product and the tank bottom product obtained by manually scraping the foam for 3min are put into an oven for drying, weighing and calculating the recovery rate, and the results are shown in Table 1, Figure 2 ​

[0043] Table 1 Relationship between pH and recovery rate of magnesite, dolomite and talc (%)

[0044] 7 8 9 10 11 12 Magnesite 88.67 86.66 76.92 95.6 96.58 98.12 Dolomite 81.1 86.32 29.7 62.84 83.45 83.62 Talc 3.67 1.94 2.24 1.83 1.55 2.27

[0045] Example 2

[0046] A preparation method of an inhibitor DYL, comprising the following steps:

[0047] The HCA solid powder is dissolved in deionized water, and after constant volume, a 50ml HCA dilute solution with a mass concentration of 1% is prepared. The sodium hydroxide is added to the curdlan solid powder, and after adding deionized water, it is placed in a constant temperature water bath to heat until the curdlan solid powder is dissolved. After constant volume, a 50ml curdlan dilute solution with a mass concentration of 1% is prepared. Finally, the HCA dilute solution and the curdlan dilute solution with the same mass concentration are mixed and constant volume to 100ml to obtain the inhibitor DYL with a mass concentration of 2%.

[0048] A method for removing silicon and calcium from magnesite by positive flotation using an inhibitor DYL, comprising the following steps:

[0049] 2.0g of magnesite, dolomite and talc with particle size in the range of-74+38μm are weighed and respectively subjected to flotation, 30ml of deionized water is added for dissolution, and then placed in a 50ml flotation tank for stirring to make the mineral particles uniformly dispersed in the slurry. The pH of the slurry is adjusted to 9, and stirred for 2min. According to the dosing sequence shown in the table, the inhibitor DYL is first added to the slurry, and the dosages of the inhibitor DYL are 100mg / L, 150mg / L, 200mg / L, 250mg / L and 300mg / L respectively, and the stirring time is 3min. Then 100mg / L of sodium oleate is added as a collector, and the stirring time is 3min. The pH value is kept constant during the dosing. After the reagents fully act, the foam product and the tank bottom product are obtained by manually scraping the foam for 3min, and then dried in an oven, weighed and calculated for the recovery rate, and the results are shown in the table. Figure 1 Figure 3

[0050] Table 2 Relationship between DYL dosage and recovery rate of magnesite, dolomite and talc (mg / L)

[0051] 100 150 200 250 300 Magnesite 76.92 89.47 91.86 92.23 92.37 Dolomite 29.7 18.66 10.4 10.25 4.26 Talc 2.24 1.59 2.14 1.41 1.56

[0052] Example 3

[0053] A preparation method of an inhibitor DYL, comprising the following steps:

[0054] ​​HCA solid powder is dissolved in deionized water, and after constant volume, a 50ml HCA dilute solution with a mass concentration of 1.5% is prepared; sodium hydroxide is added to the obtained solid powder, and after adding deionized water, the obtained solid powder is heated in a constant temperature water bath to dissolve the obtained solid powder, and after constant volume, a 50ml obtained dilute solution with a mass concentration of 1.5% is prepared, and finally the HCA dilute solution and the obtained dilute solution with the same mass concentration are mixed and constant volume to 100ml to obtain the inhibitor DYL with a mass concentration of 3%.

[0055] The inhibitor DYL is used for a method for desilication and calcium removal of magnesite by positive flotation, comprising the following steps:

[0056] Magnesite with a particle size in the range of-74+38μm is weighed at 1.6g, dolomite is weighed at 0.1g, and talc is weighed at 0.3g, which are uniformly mixed in a proportion of 12:1:1, and are dissolved in 30ml deionized water, and are placed in a 50ml flotation tank for stirring to uniformly disperse the mineral particles in the slurry.

[0057] The pH of the slurry is adjusted to 9, and stirring is performed for 2min. Figure 1 According to the order of adding reagents shown in the formula, 350mg / L of the inhibitor DYL is first added to the slurry, and the stirring time is 3min, and then 50mg / L of the collector sodium oleate is added, and the stirring time is 3min, and the pH value is kept constant during the addition of reagents. After the reagents fully act, the froth product and the tank bottom product obtained by manually scraping the froth for 3min are placed in an oven for drying, weighing, calculating the recovery rate, and analyzing the MgO, CaO and SiO2 contents of the froth product and the tank bottom product to calculate the recovery rate of MgO and SiO2 of the froth product and the tank bottom product. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment are as follows: MgO is 47.80% by mass percentage, CaO is 0.17% by mass percentage, SiO2 is 0.04% by mass percentage, and the recovery rate of MgO is 93.21% by mass percentage.

[0058] Comparative Example 1

[0059] The inhibitor is used for a method for desilication and calcium removal of magnesite by positive flotation, comprising the following steps:

[0060] Magnesite with a particle size in the range of-74+38μm is weighed at 1.6g, dolomite is weighed at 0.1g, and talc is weighed at 0.3g, which are uniformly mixed in a proportion of 12:1:1, and are dissolved in 30ml deionized water, and are placed in a 50ml flotation tank for stirring to uniformly disperse the mineral particles in the slurry.

[0061] The pH of the slurry is adjusted to 10, and stirring is performed for 2min. Figure 1The adding sequence is shown in the table, first add depressant water glass 120 mg / L and sodium hexametaphosphate 300 mg / L to the ore pulp, and the stirring time is 3 min, then add collector sodium oleate 70 mg / L, and the stirring time is 3 min, and the pH value is kept constant during the adding of the reagents. After the reagents fully act, manually scrape the foam for 3 min, put the obtained foam product and tank bottom product into an oven for drying, weighing, calculating the recovery rate, and testing the MgO, CaO and SiO2 contents of the foam product and tank bottom product, and calculating the MgO and SiO2 recovery rates of the foam product and tank bottom product. In the present comparative example, the main components of the magnesite concentrate obtained through the flotation experiment are as follows: MgO is 46.12% by mass percentage, CaO is 1.32% by mass percentage, SiO2 is 1.45% by mass percentage, and the MgO recovery rate is 86.79% by mass percentage.

[0062] Example 4

[0063] A preparation method of a depressant DYL includes the following steps:

[0064] The HCA solid powder is dissolved in deionized water, and after constant volume, a 50 ml HCA dilute solution with a mass concentration of 2% is prepared; sodium hydroxide is added to the curdlan solid powder, and after adding deionized water, the curdlan solid powder is heated in a constant-temperature water bath until it is dissolved, and after constant volume, a 50 ml curdlan dilute solution with a mass concentration of 2% is prepared, and finally the HCA dilute solution and the curdlan dilute solution with the same mass concentration are mixed and constant volume to 100 ml to obtain a depressant DYL with a mass concentration of 4%.

[0065] 1.6 g of magnesite, 0.1 g of dolomite and 0.3 g of talc with particle size in the range of-74+38 μm are weighed respectively, mixed uniformly according to the ratio of 10:1:1, dissolved in 30 ml of deionized water, and put into a 50 ml flotation tank for stirring to make the mineral particles uniformly dispersed in the ore pulp.

[0066] The pH of the ore pulp is adjusted to 9, and stirred for 2 min. Figure 1 The adding sequence is shown in the table, first add depressant water glass 120 mg / L and sodium hexametaphosphate 300 mg / L to the ore pulp, and the stirring time is 3 min, then add collector sodium oleate 70 mg / L, and the stirring time is 3 min, and the pH value is kept constant during the adding of the reagents. After the reagents fully act, manually scrape the foam for 3 min, put the obtained foam product and tank bottom product into an oven for drying, weighing, calculating the recovery rate, and testing the MgO, CaO and SiO2 contents of the foam product and tank bottom product, and calculating the MgO and SiO2 recovery rates of the foam product and tank bottom product. In the present comparative example, the main components of the magnesite concentrate obtained through the flotation experiment are as follows: MgO is 46.12% by mass percentage, CaO is 1.32% by mass percentage, SiO2 is 1.45% by mass percentage, and the MgO recovery rate is 86.79% by mass percentage.

[0067] Comparative Example 2

[0068] A method for using inhibitors in the positive flotation desilication of magnesite includes the following steps:

[0069] Weigh out 1.6g of magnesite, 0.1g of dolomite, and 0.3g of talc with particle sizes in the range of -74 to +38μm, mix them evenly in a ratio of 10:1:1, add 30ml of deionized water to dissolve them, and put them into a 50ml flotation cell for stirring to make the mineral particles evenly dispersed in the slurry.

[0070] Adjust the pH of the slurry to 10 and stir for 2 minutes. Follow... Figure 1 The dosing sequence is as follows: first, add 80 mg / L of water glass and 250 mg / L of sodium hexametaphosphate as inhibitors to the slurry, stirring for 3 minutes each. Then, add 150 mg / L of oxidized paraffin soap as collector, stirring for 3 minutes. Maintain a constant pH during dosing. After the reagents have fully reacted, manually skim the foam for 3 minutes. The resulting foam and bottom products are dried in an oven, weighed, and the recovery rate is calculated. The MgO, CaO, and SiO2 contents of the foam and bottom products are analyzed, and the MgO and SiO2 recovery rates are calculated. In this comparative example, the main components of the magnesite concentrate obtained by flotation experiments are 46.35% MgO, 0.74% CaO, and 0.37% SiO2 by mass percentage, with a MgO recovery rate of 89.21% by mass percentage.

[0071] Example 5

[0072] A method for preparing an inhibitor DYL includes the following steps:

[0073] HCA solid powder was dissolved in deionized water and diluted to a final volume to prepare a 50 ml HCA dilute solution with a mass concentration of 0.5%. Sodium hydroxide and deionized water were added to gellan gum solid powder and heated in a constant temperature water bath until the gellan gum solid powder dissolved. The solution was then diluted to a final volume to prepare a 50 ml gellan gum dilute solution with a mass concentration of 0.5%. Finally, the HCA dilute solution and the gellan gum dilute solution of the same mass concentration were mixed and diluted to a final volume of 100 ml to obtain a 1% DYL inhibitor.

[0074] A method for using the inhibitor DYL in the positive flotation desilication of magnesite includes the following steps:

[0075] Weigh out 1.6g of magnesite, 0.1g of dolomite, and 0.3g of talc with particle sizes in the range of -74 to +38μm, mix them evenly in a ratio of 7:1:1, add 30ml of deionized water to dissolve them, and put them into a 50ml flotation cell for stirring to make the mineral particles evenly dispersed in the slurry.

[0076] The pH of the ore slurry was adjusted to 9 and stirred for 2 min. The order of adding reagents was as shown in Table 1, and the stirring time was 3 min. During the addition of reagents, the pH value was kept constant. After the reagents fully acted, the froth product and the tank bottom product were put into an oven to dry, weighed, and the recovery rate was calculated. The contents of MgO, CaO, and SiO2 in the froth product and the tank bottom product were tested, and the recovery rates of MgO and SiO2 in the froth product and the tank bottom product were calculated. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment were as follows: MgO was 46.93% by mass fraction, CaO was 0.15% by mass fraction, and SiO2 was 0.07% by mass fraction. The recovery rate of MgO was 90.24% by mass fraction. Figure 1 The pH of the ore slurry was adjusted to 9 and stirred for 2 min. The order of adding reagents was as shown in Table 1, and the stirring time was 3 min. During the addition of reagents, the pH value was kept constant. After the reagents fully acted, the froth product and the tank bottom product were put into an oven to dry, weighed, and the recovery rate was calculated. The contents of MgO, CaO, and SiO2 in the froth product and the tank bottom product were tested, and the recovery rates of MgO and SiO2 in the froth product and the tank bottom product were calculated. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment were as follows: MgO was 46.93% by mass fraction, CaO was 0.15% by mass fraction, and SiO2 was 0.07% by mass fraction. The recovery rate of MgO was 90.24% by mass fraction.

[0077] Comparative Example 3

[0078] The magnesite 1.6 g, the dolomite 0.1 g, and the talc 0.3 g with a particle size in the range of-74+38 μm were weighed respectively, mixed uniformly according to a ratio of 7:1:1, dissolved in 30 ml of deionized water, and put into a 50 ml flotation tank for stirring to uniformly disperse the mineral particles in the ore slurry.

[0079] The pH of the ore slurry was adjusted to 9 and stirred for 2 min. The order of adding reagents was as shown in Table 1, and the stirring time was 3 min. During the addition of reagents, the pH value was kept constant. After the reagents fully acted, the froth product and the tank bottom product were put into an oven to dry, weighed, and the recovery rate was calculated. The contents of MgO, CaO, and SiO2 in the froth product and the tank bottom product were tested, and the recovery rates of MgO and SiO2 in the froth product and the tank bottom product were calculated. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment were as follows: MgO was 46.93% by mass fraction, CaO was 0.15% by mass fraction, and SiO2 was 0.07% by mass fraction. The recovery rate of MgO was 90.24% by mass fraction. Figure 1 Example 6

[0080] A preparation method of an inhibitor DYL includes the following steps:

[0081] A preparation method of an inhibitor DYL includes the following steps:

[0082] HCA solid powder is dissolved in deionized water, and after constant volume, a 50ml HCA dilute solution with a mass concentration of 0.5% is prepared; sodium hydroxide is added to the gellan gum solid powder, and after adding deionized water, the gellan gum solid powder is heated in a constant temperature water bath until it is dissolved. After constant volume, a 50ml gellan gum dilute solution with a mass concentration of 0.5% is prepared, and finally the HCA dilute solution and the gellan gum dilute solution with the same mass concentration are mixed and constant volume to 100ml to obtain the inhibitor DYL with a mass concentration of 1%.

[0083] The inhibitor DYL is used for a method for desilication and calcium removal of magnesite by positive flotation, comprising the following steps:

[0084] Magnesite with a particle size in the range of-74+38μm is weighed at 1.6g, dolomite is weighed at 0.1g, and talc is weighed at 0.3g, which are uniformly mixed in a proportion of 4:1:1, and then dissolved in 30ml deionized water, and then placed in a 50ml flotation tank for stirring to uniformly disperse the mineral particles in the slurry.

[0085] The pH of the slurry is adjusted to 9, and stirred for 2min. According to the order of adding reagents shown in Figure 1 The inhibitor DYL is first added to the slurry at 270mg / L, and stirred for 3min, and then the collector benzo hydroxamic acid is added at 130mg / L, and stirred for 3min, and the pH value is kept constant during the addition of reagents. After the reagents fully act, the froth product and the tank bottom product are obtained by manually scraping the froth for 3min, and then dried in an oven, weighed, and the recovery rate is calculated, and the contents of MgO, CaO, and SiO2 in the froth product and the tank bottom product are analyzed, and the recovery rates of MgO and SiO2 in the froth product and the tank bottom product are calculated. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment are as follows: MgO is 47.29% by mass percentage, CaO is 0.11% by mass percentage, SiO2 is 0.12% by mass percentage, and the recovery rate of MgO is 92.04% by mass percentage.

[0086] Comparative Example 4

[0087] Magnesite with a particle size in the range of-74+38μm is weighed at 1.6g, dolomite is weighed at 0.1g, and talc is weighed at 0.3g, which are uniformly mixed in a proportion of 4:1:1, and then dissolved in 30ml deionized water, and then placed in a 50ml flotation tank for stirring to uniformly disperse the mineral particles in the slurry.

[0088] The pH of the slurry is adjusted to 10, and stirred for 2min. According to the order of adding reagents shown in Figure 1The dosing sequence is as follows: first, add 75 mg / L of water glass and 200 mg / L of sodium hexametaphosphate as inhibitors to the slurry, stirring for 3 minutes each. Then, add 150 mg / L of benzohydroxyxamic acid as collector, stirring for 3 minutes. Maintain a constant pH during dosing. After the reagents have fully reacted, manually skim the foam for 3 minutes. The resulting foam and bottom products are dried in an oven, weighed, and the recovery rate is calculated. The MgO, CaO, and SiO2 contents of the foam and bottom products are analyzed, and the MgO and SiO2 recovery rates are calculated. In this comparative example, the main components of the magnesite concentrate obtained by flotation experiments are 46.89% MgO, 0.23% CaO, and 0.45% SiO2 by mass percentage, with a MgO recovery rate of 88.65% by mass percentage.

[0089] Example 7

[0090] A method for preparing an inhibitor DYL includes the following steps:

[0091] HCA solid powder was dissolved in deionized water and diluted to a final volume to prepare a 50 ml HCA dilute solution with a mass concentration of 2.5%. Sodium hydroxide and deionized water were added to gellan gum solid powder and heated in a constant temperature water bath until the gellan gum solid powder dissolved. The solution was then diluted to a final volume to prepare a 50 ml gellan gum dilute solution with a mass concentration of 2.5%. Finally, the HCA dilute solution and the gellan gum dilute solution of the same mass concentration were mixed and diluted to a final volume of 100 ml to obtain a 5% DYL inhibitor.

[0092] A method for using the inhibitor DYL in the positive flotation desilication of magnesite includes the following steps:

[0093] Weigh out 1.6g of magnesite, 0.1g of dolomite, and 0.3g of talc with particle sizes in the range of -74 to +38μm, mix them evenly in a ratio of 1:1:1, add 30ml of deionized water to dissolve them, and put them into a 50ml flotation cell for stirring to make the mineral particles evenly dispersed in the slurry.

[0094] Adjust the pH of the slurry to 9 and stir for 2 minutes. Follow... Figure 1The adding sequence is shown in the table, first add the depressant DYL2 20 mg / L to the ore pulp, the stirring time is 3 min, then add the collector sodium oleate 70 mg / L, benzohydroxamic acid 150 mg / L, the stirring time is 3 min, keep the pH value constant during the adding period. After the reagents fully act, manually scrape the foam for 3 min, put the obtained foam product and the tank bottom product into the oven to dry, weigh, calculate the recovery rate, and test the MgO, CaO, SiO2 content of the foam product and the tank bottom product, calculate the recovery rate of MgO, SiO2 of the foam product and the tank bottom product. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment are as follows: MgO is 47.51% by mass percentage, CaO is 0.09% by mass percentage, SiO2 is 0.10% by mass percentage, and the MgO recovery rate is 88.97% by mass percentage.

[0095] Comparative Example 5

[0096] Magnesite 1.6 g, dolomite 0.1 g, talc 0.3 g with particle size in the range of-74+38 μm are weighed respectively, mixed uniformly according to the ratio of 1:1:1, dissolved in 30 ml deionized water, put into a 50 ml flotation cell for stirring, so that the mineral particles are uniformly dispersed in the ore pulp.

[0097] The pH of the ore pulp is adjusted to 10, and stirred for 2 min. According to the adding sequence shown in the table, first add the depressant sodium alginate 280 mg / L to the ore pulp, the stirring time is 3 min respectively, then add the collector sodium oleate 50 mg / L, benzohydroxamic acid 100 mg / L, the stirring time is 3 min, keep the pH value constant during the adding period. After the reagents fully act, manually scrape the foam for 3 min, put the obtained foam product and the tank bottom product into the oven to dry, weigh, calculate the recovery rate, and test the MgO, CaO, SiO2 content of the foam product and the tank bottom product, calculate the recovery rate of MgO, SiO2 of the foam product and the tank bottom product. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment are as follows: MgO is 47.51% by mass percentage, CaO is 0.09% by mass percentage, SiO2 is 0.10% by mass percentage, and the MgO recovery rate is 88.97% by mass percentage. Figure 1 The adding sequence is shown in the table, first add the depressant DYL2 20 mg / L to the ore pulp, the stirring time is 3 min, then add the collector sodium oleate 70 mg / L, benzohydroxamic acid 150 mg / L, the stirring time is 3 min, keep the pH value constant during the adding period. After the reagents fully act, manually scrape the foam for 3 min, put the obtained foam product and the tank bottom product into the oven to dry, weigh, calculate the recovery rate, and test the MgO, CaO, SiO2 content of the foam product and the tank bottom product, calculate the recovery rate of MgO, SiO2 of the foam product and the tank bottom product. In this embodiment, the main components of the magnesite concentrate obtained by the flotation experiment are as follows: MgO is 47.51% by mass percentage, CaO is 0.09% by mass percentage, SiO2 is 0.10% by mass percentage, and the MgO recovery rate is 88.97% by mass percentage.

Claims

1. A method for using the inhibitor DYL in the positive flotation desilication and calcium removal of magnesite, characterized in that, Includes the following steps: S1: Take pure magnesite minerals in the -74 to +38 μm particle size range, dissolve them in deionized water to prepare a slurry for flotation test, and put it into the flotation cell; S2: Place the flotation cell containing the slurry on the flotation machine and stir it to make the pure mineral particles evenly distributed in the slurry; S3: Adjust the slurry to the set pH value using HCl or NaOH solution, and stir for 1-3 minutes under this pH condition; S4: Add the inhibitor DYL to allow the reagent to fully react with the mineral surface for 1-3 minutes; S5: Add a collector to allow the agent to react fully with the mineral surface for 1-3 minutes. During the addition of the agent, maintain a constant pH value. The collector is one or two of sodium oleate, oxidized paraffin soap, sodium petroleum sulfonate, and benzohydroxyxamic acid. S6: After the agent has fully acted, manually scrape the foam for 3-5 minutes. Place the obtained foam product and the bottom product in the oven to dry, weigh, calculate the recovery rate, and test the MgO, CaO, and SiO2 content. The preparation method of the inhibitor DYL is as follows: HCA solid powder is dissolved in deionized water, and after adjusting the volume, a dilute HCA solution with a mass concentration of 0.5% to 5% is prepared; sodium hydroxide is added to gellan gum solid powder, followed by deionized water, and the mixture is heated in a constant temperature water bath until the gellan gum solid powder dissolves. After adjusting the volume, a dilute gellan gum solution with a mass concentration of 0.5% to 5% is prepared. Finally, the dilute HCA solution and the dilute gellan gum solution with the same mass concentration are mixed at a mass ratio of 1:1 to obtain the inhibitor DYL.

2. The method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, The amount of sodium hydroxide added is 10% to 30% of the mass of the gellan gum solid powder, and the temperature of the constant temperature water bath is maintained between 50°C and 90°C.

3. The method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, In step S1, the pure magnesite mineral has a MgO content of 43.1%~47.8% by weight, a CaO content of 0.1%~0.6%, a SiO2 content of 0.01%~0.2%, an Al2O3 content of 0.1%~0.3%, and a TFe content of 0.1%.

4. The method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, In step S2, the stirring speed on the flotation machine is 1900~2100 r / min; the stirring time is 1~3 min.

5. A method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, In step S3, the mass concentration of the HCl solution is 0.1%~5%, and the mass concentration of the NaOH solution is 0.1%~5%; the pH value range is 7~12.

6. A method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, In step S4, the dosage of the inhibitor DYL is 100~350 mg / L.

7. A method for using the inhibitor DYL for desilication and calcium removal in the positive flotation of magnesite according to claim 1, characterized in that, In step S5, the amount of sodium oleate is 33~150 mg / L, the amount of oxidized paraffin soap is 120 mg / L~150 mg / L, the amount of sodium petroleum sulfonate is 210 mg / L~360 mg / L, and the amount of benzohydroxyxamic acid is 100 mg / L~150 mg / L.

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