Environment-friendly feldspar supramolecular inhibitor as well as preparation method and application thereof

Abstract

The invention discloses an environment-friendly feldspar supramolecular inhibitor as well as a preparation method and application thereof, and relates to the field of mineral processing. Wherein R is shown in the specification. The method is used for separating quartz and feldspar in minerals with the feldspar content higher than that of quartz. According to the method, feldspar in minerals is inhibited through the fluorine-free environment-friendly feldspar supramolecular inhibitor, quartz is floated, the agent is green and environmentally friendly, the dosage of the agent is small, the cost is reduced, and the separation efficiency and the purity of quartz are improved.

Description

Technical Field

[0001] This application relates to the field of mineral processing, and in particular to an environmentally friendly feldspar supramolecular inhibitor, its preparation method, and its application. Background Technology

[0002] In the processing of quartz ore, feldspar and quartz need to be separated to improve the grade of the target product, quartz concentrate, while also utilizing the feldspar. Currently, the separation of feldspar and quartz mainly involves inhibiting the flotation of feldspar by adding hydrofluoric acid, achieving a separation efficiency of 60-70%.

[0003] However, since the content of quartz and feldspar varies among different minerals, when the content of feldspar in the mineral to be processed is greater than that of quartz, the grade of the obtained quartz concentrate is low, and the amount of reagent used is large, which is not conducive to environmental protection. Summary of the Invention

[0004] In view of the shortcomings of the aforementioned related technologies, this application provides an environmentally friendly feldspar supramolecular inhibitor, its preparation method, and its application. This application uses a fluorine-free, environmentally friendly feldspar supramolecular inhibitor to inhibit feldspar in minerals, thereby flotating quartz. The reagent itself is green and environmentally friendly, and the amount used is small, reducing costs and improving separation efficiency and quartz purity.

[0005] Firstly, the environmentally friendly feldspar supramolecular inhibitor provided in this application adopts the following technical solution: An environmentally friendly feldspar supramolecular inhibitor has the following general structural formula: Where R is .

[0006] Secondly, the preparation method of the environmentally friendly feldspar supramolecular inhibitor provided in this application adopts the following technical solution: A method for preparing an environmentally friendly feldspar supramolecular inhibitor includes the following steps: preparing tannic acid into an aqueous solution, adjusting the pH to 5-7, adding a ferrous ion salt solution dropwise, reacting for 12-14 hours, filtering, washing, and drying to obtain the environmentally friendly feldspar supramolecular inhibitor.

[0007] Preferably, the molar ratio of tannic acid to ferrous ions is 2-4:1.

[0008] Preferably, the molar ratio of tannic acid to ferrous ions is 3:1.

[0009] Preferably, the concentration of tannic acid in the tannic acid aqueous solution is 25-35 mg / mL.

[0010] Preferably, the concentration of tannic acid in the tannic acid aqueous solution is 30 mg / mL.

[0011] Preferably, the step of adding the ferrous salt solution is carried out at 35-45°C using the tannic acid aqueous solution.

[0012] Preferably, the step of adding the ferrous ion salt solution is carried out at 40°C in the tannic acid aqueous solution.

[0013] Preferably, the ferrous ion salt includes one or more of ferrous chloride, ferrous sulfate, and ferrous nitrate.

[0014] Preferably, the ferrous salt is ferrous chloride.

[0015] Preferably, the pH adjustment is performed by adding an acetate-sodium acetate buffer solution.

[0016] Thirdly, the application of the environmentally friendly feldspar supramolecular inhibitor provided in this application adopts the following technical solution: Application of an environmentally friendly feldspar supramolecular inhibitor, wherein the environmentally friendly feldspar supramolecular inhibitor is used to separate quartz and feldspar in minerals where the feldspar content is higher than the quartz content.

[0017] Preferably, the separation includes the following steps: preparing a mineral slurry with a mineral concentration of 300 g / L, adjusting the pH of the slurry to 8-9, adding the environmentally friendly feldspar supramolecular inhibitor and collector and stirring evenly, adding a foaming agent and then aerating and scraping the foam, collecting the foam, washing and drying to obtain quartz concentrate, and filtering and drying the remaining tailings to obtain feldspar.

[0018] Preferably, the amount of the environmentally friendly feldspar supramolecular inhibitor added is 300-400 g / t based on the mineral weight.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This application uses an environmentally friendly feldspar supramolecular inhibitor, in which hydroxyl groups and metal ions act on feldspar through chemical bonds, while having a weak effect on quartz in the mineral. This selectively locks feldspar particles to inhibit feldspar, thereby improving the separation efficiency of quartz and feldspar in the mineral and improving the purity of the quartz product. 2. This application uses an environmentally friendly feldspar supramolecular inhibitor. The agent is fluorine-free and environmentally friendly. It inhibits the relatively high content of feldspar in minerals, improves the separation efficiency of feldspar and quartz in minerals, thereby reducing the amount of agent used and further reducing environmental pollution. 3. The environmentally friendly feldspar supramolecular inhibitor of this application has low raw material cost, simple preparation process, and small dosage of reagent when used. In summary, it reduces the cost of separating feldspar and quartz. Detailed Implementation

[0020] The present application will be further described in detail below with reference to the embodiments. The following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention.

[0021] The raw materials used in the examples and comparative examples are all commercially available.

[0022] Example 1 Example 1 of this application provides an environmentally friendly feldspar supramolecular inhibitor, which is prepared by the following steps: Tannic acid is prepared into a 30 mg / mL aqueous solution in a beaker. The pH is adjusted to 5-7 using an acetic acid-sodium acetate buffer solution. The beaker containing the tannic acid aqueous solution is placed in a water bath shaking pot at 40°C. Ferrous chloride solution is slowly added dropwise until the molar ratio of tannic acid to ferrous chloride in the beaker is 3:1. The reaction is carried out for 13 hours. After filtration, washing, and drying, the environmentally friendly feldspar supramolecular inhibitor is obtained, with the structural formula shown below: Where R is .

[0023] Example 2 Example 2 of this application provides an environmentally friendly feldspar supramolecular inhibitor. The difference between Example 2 and Example 1 is that the molar ratio of tannic acid to ferrous chloride added during the preparation process in Example 2 is 2:1.

[0024] Example 3 Example 3 of this application provides an environmentally friendly feldspar supramolecular inhibitor. The difference between Example 3 and Example 1 is that the molar ratio of tannic acid to ferrous chloride added during the preparation process in Example 3 is 4:1.

[0025] Example 4 Example 4 of this application provides an application of an environmentally friendly feldspar supramolecular inhibitor, the specific steps of which are as follows: The mineral is prepared into a slurry with a weight concentration of 300 g / L, the pH is adjusted to 8-9, and the slurry is added to a flotation machine. The environmentally friendly feldspar supramolecular inhibitor prepared in Example 1 is added to the slurry, the amount of which is calculated based on the mineral weight as 350 g / t. The mixture is stirred for 3 min. Polypropylene glycol is added as a collector, the amount of which is calculated based on the mineral weight as 800 g / t. The mixture is stirred for 3 min. Secondary octanol is added as a frother, the amount of which is calculated based on the mineral weight as 100 g / t. After 1 min, aeration and foam removal begin, with a maximum concentration of 0.35 m. 3 / (m 2 The rotation speed is 2100 r / min, and the foam scraping time is 3-5 min. The foam is collected, washed, and dried to obtain quartz concentrate. The remaining tailings are filtered and dried to obtain feldspar.

[0026] In this embodiment, the flotation machine is an XFD-II type mechanically stirred single-cell flotation machine, and the mineral is a quartz ore with a feldspar content of 75% and a quartz content of 23%.

[0027] Example 5 Example 5 of this application provides an application of an environmentally friendly feldspar supramolecular inhibitor. The difference between Example 5 and Example 4 is that the environmentally friendly feldspar supramolecular inhibitor prepared in Example 2 is used in Example 5 to replace the environmentally friendly feldspar supramolecular inhibitor prepared in Example 1.

[0028] Example 6 Example 6 of this application provides an application of an environmentally friendly feldspar supramolecular inhibitor. The difference between Example 6 and Example 4 is that the environmentally friendly feldspar supramolecular inhibitor prepared in Example 3 is used in Example 6 to replace the environmentally friendly feldspar supramolecular inhibitor prepared in Example 1.

[0029] Comparative Example 1 Comparative Example 1 provides a method for separating quartz and feldspar in minerals with a feldspar content higher than that of quartz. The specific steps are as follows: Prepare a mineral slurry with a weight concentration of 300 g / L, adjust the pH to 8-9, and add it to a flotation machine. Add hydrofluoric acid to the slurry at a rate of 2000 g / t based on the mineral weight. Stir for 3 minutes. Add dodecylamine as a collector at a rate of 1000 g / t based on the mineral weight. Stir for 3 minutes. Add 2-octanol as a frother at a rate of 100 g / t based on the mineral weight. After 1 minute, begin aeration and frothing, with a maximum concentration of 0.35 m. 3 / (m 2The rotation speed is 2100 r / min, the foam scraping time is 3-5 min, the foam is collected, washed and dried to obtain feldspar, and the remaining tailings are filtered and dried to obtain quartz concentrate.

[0030] In this comparative example, the flotation machine used is the XFD-II type mechanically stirred single-cell flotation machine, and the mineral used is quartz ore with a feldspar content of 75% and a quartz content of 23%.

[0031] Testing and Inspection (1) The purity of the quartz concentrates obtained in Examples 4-6 and Comparative Example 1 was measured by inductively coupled plasma mass spectrometry, as shown in Table 1 below.

[0032] Table 1:

[0033] (2) The separation efficiency of feldspar tailings and quartz concentrate obtained in Examples 4-6 and Comparative Example 1 was calculated by measuring the recovery rate and purity of quartz concentrate, as shown in Table 2 below.

[0034] Table 2:

[0035] Results Analysis The following detailed description of this application is based on the experimental results provided in Table 1-2.

[0036] As shown in Table 1, the environmentally friendly feldspar supramolecular inhibitors prepared in Examples 1-3 were used to inhibit feldspar in quartz ore with a feldspar content of 75% and a quartz content of 23%. After quartz flotation, the purity of the target product, quartz concentrate, reached over 97.84%. The environmentally friendly feldspar supramolecular inhibitor prepared in Example 1 was used to separate quartz and feldspar, and the purity of the resulting quartz concentrate reached 98.56%. This indicates that a molar ratio of tannic acid to ferrous chloride of 3:1 is beneficial to improving the purity of the quartz concentrate obtained when using it to separate quartz and feldspar during the preparation of the environmentally friendly feldspar supramolecular inhibitor. This is because the environmentally friendly feldspar supramolecular inhibitor prepared in Example 1 has a better inhibitory effect on feldspar than the environmentally friendly feldspar supramolecular inhibitors in Examples 2 and 3. Compared to the use of hydrofluoric acid to suppress quartz in quartz ore with a feldspar content of 75% and a quartz content of 23% in Example 4, the environmentally friendly feldspar supramolecular inhibitor prepared in Example 1 significantly improved the purity of the target product, quartz concentrate, and increased the grade of the obtained quartz concentrate. At the same time, the amount of the environmentally friendly feldspar supramolecular inhibitor used was less than one-fifth of that used for hydrofluoric acid, and the environmentally friendly feldspar supramolecular inhibitor did not contain fluorine, which greatly reduced the difficulty and cost of treating the waste liquid after use and the degree of environmental pollution, making it green and environmentally friendly.

[0037] Referring to Table 2, the method of Comparative Example 1 was used to separate quartz and feldspar in minerals with a feldspar content higher than quartz content, with a separation efficiency of only 69%. However, in Examples 4-6, when the environmentally friendly feldspar supramolecular inhibitors prepared in Examples 1-3 were applied to separate quartz and feldspar in minerals with a feldspar content higher than quartz content, the separation efficiency reached over 80%, greatly increasing the separation efficiency of quartz and feldspar in minerals with a feldspar content higher than quartz content. In Example 4, which applied the environmentally friendly feldspar supramolecular inhibitor prepared in Example 1, the separation efficiency of feldspar and quartz reached 86%.

[0038] In summary, the environmentally friendly feldspar supramolecular inhibitors of Examples 1-3 of this application, when applied to the separation of quartz and feldspar in minerals with a feldspar content higher than that of quartz using the methods of Examples 4-6, not only improve the purity and grade of the target product, quartz concentrate, but also enhance the separation efficiency of quartz and feldspar. Furthermore, the environmentally friendly feldspar supramolecular inhibitors are themselves green and environmentally friendly, requiring significantly less dosage compared to hydrofluoric acid, resulting in lower cost and less pollution.

[0039] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An environmentally friendly feldspar supramolecular inhibitor, characterized in that: Its general structural formula is shown below: Where R is .

2. A method for preparing the environmentally friendly feldspar supramolecular inhibitor as described in claim 1, characterized in that: Includes the following steps: Tannic acid was prepared into an aqueous solution, the pH was adjusted to 5-7, and a ferrous ion salt solution was added dropwise. The reaction was carried out for 12-14 hours, and the solution was filtered, washed, and dried to obtain the environmentally friendly feldspar supramolecular inhibitor.

3. The preparation method of the environmentally friendly feldspar supramolecular inhibitor according to claim 2, characterized in that: The molar ratio of tannic acid to ferrous ions is 2-4:

1.

4. The preparation method of an environmentally friendly feldspar supramolecular inhibitor according to claim 2, characterized in that: The concentration of tannic acid in the tannic acid aqueous solution is 25-35 mg / mL.

5. The method for preparing an environmentally friendly feldspar supramolecular inhibitor according to claim 2, characterized in that: The tannic acid aqueous solution was subjected to the step of adding divalent ferric salt solution at 35-45℃.

6. The method for preparing an environmentally friendly feldspar supramolecular inhibitor according to claim 2, characterized in that: The ferrous ion salts include one or more of ferrous chloride, ferrous sulfate, and ferrous nitrate.

7. The method for preparing an environmentally friendly feldspar supramolecular inhibitor according to claim 2, characterized in that: The pH is adjusted by adding an acetate-sodium acetate buffer solution.

8. The application of an environmentally friendly feldspar supramolecular inhibitor as described in claim 1, characterized in that: The environmentally friendly feldspar supramolecular inhibitor is used to separate quartz and feldspar in minerals where the feldspar content is higher than the quartz content.

9. The application of the environmentally friendly feldspar supramolecular inhibitor according to claim 8, characterized in that: The separation process includes the following steps: preparing a mineral slurry with a mineral concentration of 300 g / L, adjusting the pH of the slurry to 8-9, adding the environmentally friendly feldspar supramolecular inhibitor and collector and stirring evenly, adding a foaming agent and then aerating and scraping the foam, collecting the foam, washing and drying to obtain quartz concentrate, and filtering and drying the remaining tailings to obtain feldspar.

10. The method for preparing an environmentally friendly feldspar supramolecular inhibitor according to claim 8, characterized in that: The amount of the environmentally friendly feldspar supramolecular inhibitor added is 300-400g / t based on the mineral weight.

Images