Method for separating and purifying strongly weathered granite according to size fractions

Abstract

The invention discloses a method for separating and purifying strongly-weathered granite by size fraction. The method comprises the following steps: step 1, preparing a sample with the particle size of more than or equal to 0.5 mm and a sample with the particle size of less than 0.5 mm from strongly-weathered granite ore by adopting a scrubbing-screening process; 2, preparing potassium feldspar coarse concentrate and quartz coarse concentrate from a sample with the particle size of more than or equal to 0.5 mm by adopting processes of grinding, screening, magnetic separation for three times, grading, scrubbing, reagent removal and direct flotation, preparing superior potassium feldspar I for ceramics by adopting a process of deep purification and deacidification, and preparing quartz fine sand for optical glass by adopting a process of reverse flotation; and 3, preparing a qualified product potassium feldspar II for ceramics from the sample with the particle size of less than 0.5 mm by adopting a desliming-three-time magnetic separation process. According to the difference of main minerals contained in a sample with the particle size larger than or equal to 0.5 mm and a sample with the particle size smaller than 0.5 mm in the strongly-weathered granite ore, different mineral separation and purification processes are adopted, potassium feldspar of different qualities is recycled, and quartz fine sand for optical glass is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of ore dressing, and specifically relates to a method for beneficiation and purification of weathered granite by particle size fractionation. Background Art

[0002] Granite is an igneous rock formed by the condensation of magma underground and is widely distributed in nature. Its main minerals are quartz, feldspar, mica, etc. Unweathered or slightly weathered granite has characteristics such as a compact structure and high strength, and is mainly used in fields such as construction, roads and bridges, ceramics, and glass. Strongly weathered granite is a highly weathered rock formed by the long-term physical, chemical, and biological weathering of granite on the surface or near the surface. Its main minerals are quartz, feldspar, kaolin, mica, etc. Its strength is significantly reduced, and the particle size is mainly below 10 mm. It is mainly distributed in southern China, southwestern China, etc. in China. It is mainly used as aggregate or filler in infrastructure construction. The feldspar obtained after beneficiation and purification is used in industries such as ceramics or glass, with a low added value. The high-quality quartz resources in strongly weathered granite are not fully utilized, resulting in waste of resources.

[0003] Optical glass is widely used in the lenses of various optical instruments and has a high added value. With the rapid development of technology, the demand for optical glass increases year by year. High-quality quartz is the main raw material for optical glass, and its quality requirements are as follows: SiO2≥99.60%, Al2O3≤0.20%, Fe2O3≤0.0060%. Therefore, the present invention aims to provide a method for beneficiation and purification of weathered granite by particle size fractionation to solve the problem that only feldspar in existing strongly weathered granite is utilized, while the quartz therein is not fully utilized, resulting in low utilization rate. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention proposes a method for beneficiation and purification of weathered granite by particle size fractionation.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A method for beneficiation and purification of weathered granite by particle size fractionation includes the following steps: First step, put the strongly weathered granite into a scrubber for wet scrubbing to separate the particles from the surface mud.

[0007] Second step, put the scrubbed pulp into a vibrating screen for wet screening to obtain a sample with a particle size ≥0.5 mm and a sample with a particle size <0.5 mm.

[0008] Third step, adopt the process of "grinding - screening - magnetic separation - magnetic separation - magnetic separation - classification - scrubbing - de-drug - positive flotation" for the sample with a particle size ≥0.5 mm to obtain crude potassium feldspar concentrate and crude quartz concentrate.

[0009] The fourth step is to obtain potassium feldspar II by using the "de-sludge-magnetic separation-magnetic separation-magnetic separation" beneficiation process for samples with a particle size of less than 0.5 mm.

[0010] As a further preferred embodiment of the present technical solution: the third step is specifically:

[0011] (3-1) Grinding-Screening: Samples with a particle size of ≥ 0.5 mm are placed in a rod mill for grinding. The resulting ground products are screened by a vibrating screen. The screened products are returned to the rod mill for further grinding, and the screened products are processed in the next step.

[0012] (3-2) Three-stage magnetic separation: The undersize product is sequentially subjected to three-stage magnetic separation by a drum magnetic separator, a vertical ring high gradient magnetic separator and a periodic slurry magnetic separator, with background magnetic field strengths of 0.5 T, 1.3 T and 1.5 T, respectively, to remove biotite and iron-containing magnetic minerals and obtain magnetically separated concentrate;

[0013] (3-3) Hydraulic classification: The magnetically separated concentrated sand is placed in a hydraulic classifier for classification to obtain classified sediment with a particle size of ≥0.105 mm and classified overflow with a particle size of <0.105 mm;

[0014] (3-4) Scrubbing and decontamination: Wet scrubbing of graded sand with sulfuric acid to remove surface film iron, mud, and Ca 2+ Mg 2 , obtain scrubbing fine sand;

[0015] (3-5) Positive flotation: The scrubbed concentrate is placed in a flotation machine for positive flotation to obtain potassium feldspar concentrate and quartz concentrate;

[0016] (3-6) Deep purification-deacidification: Deeply purify the potassium feldspar concentrate to remove the impregnated iron on the surface or in the gaps to obtain potassium feldspar I;

[0017] (3-7) Reverse flotation: The quartz concentrate is subjected to reverse flotation to obtain quartz concentrate.

[0018] As a further preferred embodiment of the present technical solution: the fourth step is specifically:

[0019] (4-1) Desludging: Samples with a particle size of less than 0.5 mm are placed in a desludging bucket for desludging to obtain sediment with a particle size of ≥ 0.045 mm and mud with a particle size of less than 0.045 mm;

[0020] (4-2) Three-stage magnetic separation: The sediment is sequentially subjected to three-stage magnetic separations by a drum magnetic separator, a vertical ring high gradient magnetic separator and a periodic slurry magnetic separator, with background magnetic field intensities of 0.5 T, 1.3 T and 1.5 T, respectively, to obtain potassium feldspar II.

[0021] As a further optimization of this technical solution: in the scrubbing - drug removal step, the dosage of sulfuric acid is 10 - 30 kg / t, and the scrubbing time is 5 - 15 min.

[0022] As a further optimization of this technical solution: in the positive flotation step, the flotation reagent regime is as follows: sulfuric acid adjusts the pH of the pulp to 2 - 3, the dosage of the collector dodecylamine is 0.48 - 0.80 kg / t, and the dosage of petroleum sulfonate is 1.20 - 2.0 kg / t.

[0023] As a further optimization of this technical solution: in the deep purification - deacidification step, the process conditions are as follows: the dosage of sulfuric acid is 30 kg / t - 50 kg / t, the temperature is 60 °C - 80 °C, the time is 0.5 h - 1 h, and the pulp concentration is 50% - 60%.

[0024] As a further optimization of this technical solution: in the reverse flotation step, the flotation reagent regime is as follows: sulfuric acid adjusts the pH of the pulp to 2 - 3, the dosage of the collector dodecylamine is 0.2 - 0.5 kg / t, and the dosage of petroleum sulfonate is 0.5 - 1.25 kg / t.

[0025] As a further optimization of this technical solution: the quality indexes of the potassium feldspar Ⅰ are as follows: K2O ≥ 10%, K2O + Na2O ≥ 12%, Fe2O3 + TiO2 ≤ 0.10%.

[0026] As a further optimization of this technical solution: the quality indexes of the quartz concentrate are as follows: SiO2 ≥ 99.60%, Al2O3 ≤ 0.20%, Fe2O3 ≤ 0.0060%.

[0027] As a further optimization of this technical solution: the quality indexes of the potassium feldspar Ⅱ are as follows: K2O + Na2O ≥ 10%, Fe2O3 + TiO2 ≤ 0.60%.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] Based on the differences in the main minerals contained in the samples with particle size ≥ 0.5 mm and samples with particle size < 0.5 mm in the strongly weathered granite ore, the present invention adopts different ore dressing and purification processes, not only recovering potassium feldspar of different qualities but also obtaining quartz concentrate that meets the index requirements of quartz sand for optical glass, thereby improving the added value of the utilization of this type of ore. Description of the Drawings

[0030] Figure 1 It is a flow chart of a method for beneficiation and purification of fractionated strongly weathered granite of the present invention; Detailed Embodiments

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] Please refer to Figure 1 , this application provides a method for beneficiation and purification of weathered granite by particle size fractionation, including weathered granite, and the following steps: First step, put the weathered granite from a certain place in Guangxi with a particle size ≤ 10mm accounting for 96.55% into a scrubbing machine for wet scrubbing for 10 minutes to separate the particles from the surface mud, and the pulp concentration is 60%;

[0034] Second step, put the scrubbed pulp into a vibrating screen for wet screening to obtain a sample with a particle size ≥ 0.5mm and a sample with a particle size < 0.5mm;

[0035] Third step, adopt the process of "grinding - screening - magnetic separation - magnetic separation - magnetic separation - classification - scrubbing - de - medication - direct flotation" for the sample with a particle size ≥ 0.5mm to obtain crude potassium feldspar concentrate and crude quartz concentrate. And the crude potassium feldspar concentrate adopts the process of "deep purification - de - acidification" to obtain potassium feldspar I that meets the index requirements of potassium feldspar for daily - use ceramics (first - class product), and the crude quartz concentrate adopts the process of "reverse flotation" to obtain quartz fine sand that meets the index requirements of quartz sand for optical glass;

[0036] Specifically: Step (3 - 1) Put the sample with a particle size ≥ 0.5mm into a rod mill for grinding for 4 minutes. The grinding product is screened by a vibrating screen to obtain an over - size product with a particle size ≥ 0.5mm and an undersize product with a particle size < 0.5mm. Among them, the over - size product is returned to the rod mill for continuous grinding, and the undersize product is processed in the next step;

[0037] Step (3 - 2) Put the undersize product with a particle size < 0.5mm into a drum magnetic separator for medium - intensity magnetic separation operation to remove most biotite, strongly magnetic iron - containing minerals, etc., to obtain medium - intensity magnetic concentrate. The medium - intensity magnetic concentrate enters a vertical - ring high - gradient magnetic separator for high - intensity magnetic separation operation to remove part of biotite, strongly magnetic iron - containing minerals and most weakly magnetic iron - containing minerals, etc., to obtain high - intensity magnetic concentrate. The high - intensity magnetic concentrate enters a periodic slurry magnetic separator for ultra - high - intensity magnetic separation operation to remove part of the weakly magnetic iron - containing minerals to obtain ultra - high - intensity magnetic concentrate. The background magnetic field intensities of the medium - intensity magnetic separation, high - intensity magnetic separation, and ultra - high - intensity magnetic separation operations are 0.5T, 1.3T, and 1.5T respectively;

[0038] Step (3 - 3) Put the ultra - high - intensity magnetic concentrate into a hydraulic classifier for classification to obtain classified sand with a particle size ≥ 0.105mm and classified overflow with a particle size < 0.105mm;

[0039] Step (3-4): Put the classified sand into a scrubbing machine, perform wet scrubbing with sulfuric acid for 10 minutes, and then remove the medicine to remove part of the film iron, mud, Ca 2+ , Mg 2+ on the particle surface, and obtain scrubbed fine sand. The dosage of sulfuric acid is 20 kg / t, and the pulp concentration is 50%;

[0040] Step (3-5): Put the scrubbed fine sand into a flotation machine for positive flotation to effectively separate feldspar and quartz, and obtain potassium feldspar rough concentrate and quartz rough concentrate. The dosage of sulfuric acid is 7.5 kg / t, the dosage of collector dodecylamine is 0.48 kg / t, and the dosage of sodium petroleum sulfonate is 1.2 kg / t;

[0041] Step (3-6): Put the potassium feldspar rough concentrate into a deep purification device for deep purification, remove the impregnated iron on the surface or in the gaps of the potassium feldspar, and obtain potassium feldspar Ⅰ that meets the index requirements of potassium feldspar for daily-use ceramics (first-class products). The dosage of sulfuric acid is 40 kg / t, the temperature is 70 °C, the time is 45 minutes, and the pulp concentration is 60%;

[0042] Step (3-7): Put the quartz rough concentrate into a flotation machine for reverse flotation to separate a small amount of feldspar and quartz in the quartz rough concentrate, and obtain quartz fine sand that meets the index requirements of quartz sand for optical glass. The dosage of sulfuric acid is 6 kg / t, the dosage of collector dodecylamine is 0.3 kg / t, and the dosage of sodium petroleum sulfonate is 0.75 kg / t;

[0043] Fourth step: Use the beneficiation process of "desliming - magnetic separation - magnetic separation - magnetic separation" for samples with a particle size < 0.5 mm to obtain potassium feldspar Ⅱ;

[0044] Specifically: Step (4-1): Put the samples with a particle size < 0.5 mm into a desliming hopper for desliming to obtain sand with a particle size ≥ 0.045 mm and mud with a particle size < 0.045 mm;

[0045] Step (4-2): Put the sand with a particle size ≥ 0.045 mm into a cylindrical magnetic separator for medium magnetic operation to remove most of the biotite, strongly magnetic iron-containing minerals, etc., and obtain medium magnetic fine sand. The medium magnetic fine sand enters a vertical ring high-gradient magnetic separator for strong magnetic operation to remove part of the biotite, strongly magnetic iron-containing minerals, and most of the weakly magnetic iron-containing minerals, etc., and obtain strong magnetic fine sand. The strong magnetic fine sand enters a periodic slurry magnetic separator for high-intensity magnetic operation to remove part of the weakly magnetic iron-containing minerals, and obtain potassium feldspar Ⅱ that meets the index requirements of potassium feldspar for daily-use ceramics (qualified products). The background magnetic field intensities of the medium magnetic, strong magnetic, and high-intensity magnetic operations are 0.5 T, 1.3 T, and 1.5 T respectively.

[0046] Example 2:

[0047] On the basis of Example 1, in the first step, strongly weathered granite from a certain place in Guangdong with a particle size ≤ 10 mm accounting for 92.80% is put into a scrubber for wet scrubbing for 15 minutes to separate the particles from the surface mud, and the pulp concentration is 60%;

[0048] In the second step, the scrubbed pulp is put into a vibrating screen for wet screening to obtain a sample with a particle size ≥ 0.5 mm and a sample with a particle size < 0.5 mm;

[0049] In the third step, the sample with a particle size ≥ 0.5 mm is processed by the process of "grinding - screening - magnetic separation - magnetic separation - magnetic separation - classification - scrubbing - de - medicating - direct flotation" to obtain potassium feldspar rough concentrate and quartz rough concentrate;

[0050] Specifically: In step (3 - 1), the sample with a particle size ≥ 0.5 mm is put into a rod mill for grinding for 3 minutes. The grinding product is screened by a vibrating screen to obtain an over - size product with a particle size ≥ 0.5 mm and an under - size product with a particle size < 0.5 mm. The over - size product is returned to the rod mill for continuous grinding, and the under - size product is processed in the next step;

[0051] In step (3 - 2), the under - size product with a particle size < 0.5 mm is put into a drum magnetic separator for medium magnetic separation operation to remove most biotite, strongly magnetic iron - containing minerals, etc., to obtain medium magnetic concentrate. The medium magnetic concentrate enters a vertical ring high - gradient magnetic separator for high - intensity magnetic separation operation to remove part of biotite, strongly magnetic iron - containing minerals and most weakly magnetic iron - containing minerals, etc., to obtain high - intensity magnetic concentrate. The high - intensity magnetic concentrate enters a periodic pulp magnetic separator for ultra - high - intensity magnetic separation operation to remove part of the weakly magnetic iron - containing minerals to obtain ultra - high - intensity magnetic concentrate. The background magnetic field intensities of the medium magnetic, high - intensity magnetic and ultra - high - intensity magnetic separation operations are 0.5 T, 1.3 T and 1.5 T respectively;

[0052] In step (3 - 3), the ultra - high - intensity magnetic concentrate is put into a hydraulic classifier for classification to obtain classified sand with a particle size ≥ 0.105 mm and classified overflow with a particle size < 0.105 mm;

[0053] In step (3 - 4), the classified sand is put into a scrubber for wet scrubbing with sulfuric acid for 15 minutes and then de - medicated to remove part of the film iron, mud, Ca 2+ , Mg 2+ on the particle surface to obtain scrubbed concentrate. The sulfuric acid dosage is 30 kg / t, and the pulp concentration is 50%;

[0054] In step (3 - 5), the scrubbed concentrate is put into a flotation machine for direct flotation to effectively separate feldspar and quartz to obtain potassium feldspar rough concentrate and quartz rough concentrate. The sulfuric acid dosage is 7.5 kg / t, the dosage of collector dodecylamine is 0.64 kg / t, and the dosage of petroleum sulfonate is 1.60 kg / t;

[0055] Step (3-6): Put the crude concentrate of potassium feldspar into a deep purification device for deep purification to remove the impregnated iron on the surface or in the gaps of the potassium feldspar, and obtain potassium feldspar I that meets the index requirements of potassium feldspar (first-class product) for daily-use ceramics. The dosage of sulfuric acid is 50 kg / t, the temperature is 80 °C, the time is 1 h, and the pulp concentration is 60%.

[0056] Step (3-7): Put the crude concentrate of quartz into a flotation machine for reverse flotation to separate a small amount of feldspar and quartz in the crude concentrate of quartz, and obtain quartz concentrate that meets the index requirements of quartz sand for optical glass. The dosage of sulfuric acid is 6 kg / t, the dosage of collector dodecylamine is 0.4 kg / t, and the dosage of sodium petroleum sulfonate is 1.0 kg / t.

[0057] Fourth step: Use the beneficiation process of "desliming - magnetic separation - magnetic separation - magnetic separation" for samples with a particle size < 0.5 mm to obtain potassium feldspar II.

[0058] Specifically: Step (4-1): Put the samples with a particle size < 0.5 mm into a desliming hopper for desliming to obtain sand with a particle size ≥ 0.045 mm and slime with a particle size < 0.045 mm.

[0059] Step (4-2): Put the sand with a particle size ≥ 0.045 mm into a cylindrical magnetic separator for medium-intensity magnetic separation operation to remove most biotite, strongly magnetic iron-containing minerals, etc., and obtain medium-intensity magnetic concentrate. The medium-intensity magnetic concentrate enters a vertical ring high-gradient magnetic separator for high-intensity magnetic separation operation to remove part of biotite, strongly magnetic iron-containing minerals, and most weakly magnetic iron-containing minerals, etc., and obtain high-intensity magnetic concentrate. The high-intensity magnetic concentrate enters a periodic slurry magnetic separator for ultra-high-intensity magnetic separation operation to remove part of the weakly magnetic iron-containing minerals, and obtain potassium feldspar II that meets the index requirements of potassium feldspar (qualified product) for daily-use ceramics. The background magnetic field intensities of the medium-intensity magnetic separation, high-intensity magnetic separation, and ultra-high-intensity magnetic separation operations are 0.5 T, 1.3 T, and 1.5 T respectively.

[0060] The following table shows the results obtained from the above examples:

[0061]

[0062]

[0063] It can be concluded from Example 1 and Example 2 that the main minerals in the samples with a particle size ≥ 0.5 mm in strongly weathered granite are quartz and potassium feldspar. By using physical beneficiation + chemical beneficiation, the quality of potassium feldspar I meets the index requirements of potassium feldspar (first-class product) for daily-use ceramics, and the quality of quartz concentrate meets the index requirements of quartz sand for optical glass. Among them, the main minerals in the samples with a particle size < 0.5 mm are potassium feldspar and kaolin, and potassium feldspar II that meets the index requirements of potassium feldspar (qualified product) for daily-use ceramics is obtained by physical beneficiation.

[0064] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A method for beneficiation and purification of weathered granite by particle size fractionation, characterized in that, The method comprises the following steps: first, placing the strongly weathered granite into a scrubber for wet scrubbing to separate the particles from the surface mud; In the second step, the scrubbed pulp is placed in a vibrating screen for wet screening to obtain samples with a particle size of ≥0.5 mm and samples with a particle size of <0.5 mm; In the third step, for samples with a particle size of ≥0.5 mm, the process of "grinding-screening-magnetic separation-magnetic separation-magnetic separation-classification-scrubbing-drug removal-positive flotation" is used to obtain potassium feldspar concentrate and quartz concentrate; The fourth step is to use the "de-sludge-magnetic separation-magnetic separation-magnetic separation" beneficiation process to obtain potassium feldspar II for samples with a particle size of less than 0.5 mm.

2. The method for beneficiation and purification of highly weathered granite by particle size classification according to claim 1, wherein The third step is specifically as follows: (3-1) Grinding-Screening: Samples with a particle size of ≥ 0.5 mm are placed in a rod mill for grinding. The resulting ground products are screened by a vibrating screen. The screened products are returned to the rod mill for further grinding, and the screened products are processed in the next step. (3-2) Three-stage magnetic separation: The undersize product is sequentially subjected to three-stage magnetic separation by a drum magnetic separator, a vertical ring high gradient magnetic separator and a periodic slurry magnetic separator, with background magnetic field strengths of 0.5 T, 1.3 T and 1.5 T, respectively, to remove biotite and iron-containing magnetic minerals and obtain magnetically separated concentrate; (3-3) Hydraulic classification: The magnetically separated concentrated sand is placed in a hydraulic classifier for classification to obtain classified sediment with a particle size of ≥0.105 mm and classified overflow with a particle size of <0.105 mm; (3-4) Scrubbing - drug removal: Wet scrub the classified sand with sulfuric acid to remove the surface film iron, mud, Ca 2+ , Mg 2+ , and obtain scrubbed fine sand; (3-5) Positive flotation: The scrubbed concentrate is placed in a flotation machine for positive flotation to obtain potassium feldspar concentrate and quartz concentrate; (3-6) Deep purification-deacidification: Deeply purify the potassium feldspar concentrate to remove the impregnated iron on the surface or in the gaps to obtain potassium feldspar I; (3-7) Reverse flotation: The quartz concentrate is subjected to reverse flotation to obtain quartz concentrate.

3. A method for beneficiation and purification of highly weathered granite by particle size fractionation, as claimed in claim 1, wherein, The fourth step is specifically as follows: (4-1) Desludging: Samples with a particle size of less than 0.5 mm are placed in a desludging bucket for desludging to obtain sediment with a particle size of ≥ 0.045 mm and mud with a particle size of less than 0.045 mm; (4-2) Three-stage magnetic separation: The sediment is sequentially subjected to three-stage magnetic separations by a drum magnetic separator, a vertical ring high gradient magnetic separator and a periodic slurry magnetic separator, with background magnetic field intensities of 0.5 T, 1.3 T and 1.5 T, respectively, to obtain potassium feldspar II.

4. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, In the scrubbing-drug removal step, the amount of sulfuric acid used is 10-30 kg / t, and the scrubbing time is 5-15 min.

5. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, In the forward flotation step, the flotation reagent system is as follows: sulfuric acid is used to adjust the pH of the ore pulp to 2-3, the amount of collector dodecylamine is 0.48-0.80 kg / t, and the amount of sodium petroleum sulfonate is 1.20-2.0 kg / t.

6. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, The process conditions in the deep purification-deacidification step are: sulfuric acid dosage 30kg / t to 50kg / t, temperature 60°C to 80°C, time 0.5h to 1h, and slurry concentration 50% to 60%.

7. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, In the reverse flotation step, the flotation reagent system is as follows: sulfuric acid is used to adjust the pH of the ore pulp to 2-3, the amount of collector dodecylamine is 0.2-0.5 kg / t, and the amount of sodium petroleum sulfonate is 0.5-1.25 kg / t.

8. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, The quality indexes of the potassium feldspar I are: K2O≥10%, K2O+Na2O≥12%, Fe2O3+TiO2≤0.10%.

9. A method for beneficiation and purification of highly weathered granite by particle size fractionation according to claim 2, characterized in that, The quality indexes of the quartz fine sand are as follows: SiO2≥99.60%, Al2O3≤0.20%, Fe2O3≤0.0060%.

10. A method for beneficiation and purification of highly weathered granite by particle size classification, characterized in that, The quality indexes of the potassium feldspar II are as follows: K2O + Na2O≥10%, Fe2O3 + TiO2≤0.60%.

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