Flotation impurity removal process for high-purity quartz sand

Abstract

The invention discloses a high-purity quartz sand flotation impurity removal process which comprises the following steps: S1, feeding: injecting quartz sand into a flotation machine; s2, carrying out primary flotation in a flotation machine; s3, the flotation machine is emptied for the first time; s4, the quartz sand obtained after primary flotation is injected into the flotation machine again for secondary flotation; and S5, secondary emptying is conducted, and high-purity quartz sand is obtained, in the step S2, primary flotation comprises the following steps that S201, EDI hot water is added into a flotation machine, ventilation is conducted, and the temperature of the EDI hot water ranges from 40 DEG C to 50 DEG C; s202, the flotation machine is started to fully stir the quartz sand, and then the air valve is closed; s203, HF acid is added, and the pH value is adjusted; s204, chemical adding is carried out; according to the high-purity quartz sand flotation impurity removal process, mica, feldspar, iron-containing minerals and the like can be effectively removed, after two times of flotation, internal impurities are obviously reduced, the purity of quartz sand can be greatly improved, and the high-purity quartz sand flotation impurity removal process is integrally simple and easy to control and suitable for application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of ore dressing, and particularly relates to a process for removing impurities from high-purity quartz sand by flotation. Background Art

[0002] High-purity quartz sand is a key raw material for high-tech industries such as semiconductors, photovoltaics, and optical fibers, with extremely high purity requirements. Its purity usually requires a silicon dioxide content of ≥ 99.99%. High-purity quartz has excellent optical properties, corrosion resistance, and high insulation due to its unique crystal structure and crystal characteristics; and high-purity quartz sand needs to be subjected to flotation treatment during the purification process.

[0003] The invention patent with the publication number CN202410163438.5 discloses a special flotation machine for high-purity quartz sand and its use method. The flotation method includes a pulp preparation process, a mica floating process, a feldspar floating process, and a high-purity quartz cleaning and discharging process; according to the flotation machine and the use method, the flotation effect can be promoted and the yield of high-purity quartz can be improved.

[0004] However, the above flotation method is relatively single and it is difficult to obtain high-purity quartz sand; the purpose of the above flotation method is to remove impurities such as mica and feldspar, but it is difficult to remove iron-containing minerals and other metal minerals, and the residue of other impurities affects the purity of quartz sand, and the use effect is not ideal. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a process for removing impurities from high-purity quartz sand by flotation, which can effectively remove mica, feldspar, iron-containing minerals, etc. After two flotation processes, the internal impurities are significantly reduced, the purity of quartz sand can be greatly improved, and the overall process is simple and easy to control.

[0006] To achieve the above purpose, the technical solution of the present invention is: a process for removing impurities from high-purity quartz sand by flotation, including the following steps: S1: Feeding, injecting quartz sand material into the flotation machine; S2: First flotation in the flotation machine; S3: First emptying the flotation machine; S4: Injecting the quartz sand material after the first flotation into the flotation machine again for second flotation; S5: Second emptying to obtain high-purity quartz sand.

[0007] Preferably, the primary flotation in step S2 includes the following steps: S201: Add EDI hot water into the flotation machine and ventilate, where the temperature of the EDI hot water is 40-50°C; S202: Start the flotation machine, fully stir the quartz sand, and then close the air valve; S203: Add HF acid to adjust the pH value; S204: Add medicine, add the cationic medicine of mica flotation agent and the anionic medicine of feldspar flotation agent, and then add the foaming agent; after adding the medicine, fully stir for 2-3 minutes, open the air valve for ventilation and stirring; decide whether to make up water according to the bubble height, and decide whether to add medicine according to the amount of impurities in the bubbles during flotation; after there are no obvious impurities on the surface of the flotation bubbles, drain the water inside the flotation machine; S205: After the primary flotation is completed, rinse with EDI hot water 2-3 times, and open the drain valve for a one-time drainage after the pp bucket, filter bag and grate below the flotation machine are ready.

[0008] Preferably, the secondary flotation in step S4 includes the following steps: S401: Use the overhead crane to add the pickled quartz into the flotation machine tank; S402: Add EDI hot water and ventilate and stir, close the air valve after the quartz sand is fully stirred; S403: Add HF acid to adjust the pH value; S404: Add medicine, add the cationic medicine of mica flotation agent and then add the foaming agent; after adding the medicine, fully stir for 2-3 minutes, open the air valve for ventilation and stirring; decide whether to make up water according to the bubble height, and decide whether to add medicine according to the amount of impurities in the bubbles during flotation; after there are no obvious impurities on the surface of the flotation bubbles, drain the water inside the flotation machine; S205: After the primary flotation is completed, rinse with EDI hot water 2-3 times, and open the drain valve for a one-time drainage after the pp bucket, filter bag and grate below the flotation machine are ready.

[0009] Preferably, in the primary flotation and the secondary flotation, add HF acid to adjust the pH value to 1-3.

[0010] Preferably, in S204, the ratio between the cationic medicine and the anionic medicine is 3:2.

[0011] Preferably, the cationic medicine added in the primary flotation and the secondary flotation is any one of dodecylamine, octadecylamine, and coconut oil amine.

[0012] Preferably, the anionic medicine in the primary flotation is any one of sodium petroleum sulfonate, sodium oleate, and sodium dodecyl sulfate.

[0013] A process for removing impurities from high-purity quartz sand by flotation includes the following steps: S1: Feeding, injecting quartz sand material into a flotation machine; S2: Performing primary flotation in the flotation machine; S3: Draining the flotation machine for the first time; S4: Injecting the quartz sand material after primary flotation into the flotation machine again for secondary flotation; S5: Draining for the second time to obtain high-purity quartz sand. The primary flotation in step S2 includes the following steps: S201: Adding EDI hot water into the flotation machine and ventilating, where the temperature of the EDI hot water is 40 - 50 °C; S202: Starting the flotation machine, fully stirring the quartz sand, and then closing the air valve; S203: Adding HF acid to adjust the pH value; S204: Adding drugs. After adding a cationic drug for mica flotation and an anionic drug for feldspar flotation, a foaming agent is added; after adding the drugs, stir well for 2 - 3 min, open the air valve for ventilation and stirring; decide whether to make up water according to the height of the bubbles, and decide whether to add drugs according to the amount of impurities in the bubbles during flotation; drain the water inside the flotation machine after there are no obvious impurities on the surface of the flotation bubbles; S205: After the primary flotation is completed, rinse with EDI hot water 2 - 3 times. After the pp bucket, filter bag, and grate below the flotation machine are ready, open the drain valve for the first drainage; S3: Draining the flotation machine for the first time; S4: Injecting the quartz sand material after primary flotation into the flotation machine again for secondary flotation. Compared with the prior art, this process for removing impurities from high-purity quartz sand by flotation has the beneficial effects of being able to effectively remove mica, feldspar, iron-containing minerals, etc. After two flotation processes, the internal impurities are significantly reduced, the purity of the quartz sand can be greatly improved, and the overall process is simple and easy to control. Detailed implementation mode

[0014] Now, the present invention will be further described in detail. Only the basic structure of the present invention is illustrated schematically, so it only shows the components related to the present invention.

[0015] A process for removing impurities from high-purity quartz sand by flotation includes the following steps: S1: Feeding, injecting quartz sand material into a flotation machine; S2: Performing primary flotation in the flotation machine; The primary flotation in step S2 includes the following steps: S201: Adding EDI hot water into the flotation machine and ventilating, where the temperature of the EDI hot water is 40 - 50 °C; S202: Starting the flotation machine, fully stirring the quartz sand, and then closing the air valve; S203: Adding HF acid to adjust the pH value; S204: Adding drugs. After adding a cationic drug for mica flotation and an anionic drug for feldspar flotation, a foaming agent is added; after adding the drugs, stir well for 2 - 3 min, open the air valve for ventilation and stirring; decide whether to make up water according to the height of the bubbles, and decide whether to add drugs according to the amount of impurities in the bubbles during flotation; drain the water inside the flotation machine after there are no obvious impurities on the surface of the flotation bubbles; S205: After the primary flotation is completed, rinse with EDI hot water 2 - 3 times. After the pp bucket, filter bag, and grate below the flotation machine are ready, open the drain valve for the first drainage; S3: Draining the flotation machine for the first time; S4: Injecting the quartz sand material after primary flotation into the flotation machine again for secondary flotation; The secondary flotation in step S4 includes the following steps: S401: adding the pickled quartz into the flotation machine tank by using a traveling crane; S402: adding EDI hot water and ventilating and stirring, and closing the air valve after the quartz sand is fully stirred; S403: adding HF acid and adjusting the pH value; S404: adding medicine, adding the mica flotation agent cationic agent and then the foaming agent; after adding the agent, fully stirring for 2-3 minutes, opening the air valve for ventilation and stirring; deciding whether to add water according to the height of the bubbles, and deciding whether to add medicine according to the amount of impurities in the bubbles during flotation; emptying the water inside the flotation machine after there are no obvious impurities on the surface of the flotation bubbles; S205: after the primary flotation is completed, rinse with EDI hot water 2-3 times, and open the emptying valve for primary emptying after the PP bucket, filter bag and grate under the flotation machine are ready in place; S5: secondary emptying to obtain high-purity quartz sand.

[0016] The flotation machine comprises a flotation box 1, a drain valve 2 is provided at the bottom of the flotation box 1, a liquid discharge port 3 is provided at the outer side of the flotation box 1, an upper bracket 4 is provided at the top of the flotation box 1, a rotating shaft 6 is provided on the upper bracket 4, a stirring rod 5 extending into the flotation box 1 is provided at the bottom of the rotating shaft 6, a motor 8 is provided at the outer side of the flotation box 1, and the motor 8 is connected to the rotating shaft 6 through a belt 7.

[0017] In this embodiment, HF acid is added to adjust the pH value to 1-3 during the primary flotation and the secondary flotation. In S204, the ratio between the cationic agent and the anionic agent is 3:2.

[0018] The cationic reagents added in the primary flotation and the secondary flotation are any one of dodecylamine, octadecylamine and coconut amine, and the anionic reagent in the primary flotation is any one of sodium petroleum sulfonate, sodium oleate and sodium dodecyl sulfate.

[0019] The flotation process of this technology is divided into primary flotation and secondary flotation. The flotation equipment used in the two flotations is the same. The quartz sand flotation section mainly removes mica, feldspar, iron-containing mineral impurities, etc.

[0020] The quartz material is loaded into the flotation machine by an electric hoist, and pure water and flotation reagents are added for flotation operation. After flotation, it is repeatedly washed with pure water until it is clean.

[0021] Working principle: After the quartz sand slurry and reagent are fully mixed, they are fed to the bottom of the flotation machine. After the impeller rotates, negative pressure is formed in the wheel cavity, so that the slurry under the bottom and in the trough enters the mixing zone through the lower and upper suction ports of the impeller respectively, and the air enters the mixing zone along the air guide sleeve, where the slurry, air and reagent are mixed. Under the action of the centrifugal force of the impeller, the mixed slurry enters the mineralization zone, the air forms bubbles and is crushed, and fully contacts with the quartz sand particles to form mineralized bubbles. Under the action of the stator and turbulent plate, the bubbles are evenly distributed in the cross section of the trough body, and move upward into the separation zone, enriched to form a foam layer, which is manually scraped out with a stainless steel spoon to form foam with attached impurities. The unmineralized quartz sand particles on the bottom of the trough will be mixed, mineralized and separated from impurities again through the circulation hole and the upper suction port. The quartz sand material can be discharged from the flotation machine as a finished product to the material box only after the impurities contained in the quartz sand are removed and reduced to the expected result.

[0022] In this embodiment, the flotation machine is a 400-type single-slot impeller flotation machine; its main parameters are: 1. The inner lining is made of anti-corrosion and wear-resistant PE material, PE thickness ≥ 8mm, and can withstand high temperatures of 80 degrees Celsius; 2. The impeller stator and rotor are made of polyurethane, the main shaft is made of carbon steel, the main shaft and oil seal fit tightly, and the brand oil seal ensures no oil leakage; 3. Spindle motor: 7.5KW-4 level; 4. Quartz sand that can be floated at one time: about 400 kg; 5. Two drainage holes are evenly left on the side of the flotation machine, controlled by butterfly valve, butterfly valve size: DN65; 6. The bottom discharge port is sealed with a butterfly valve to prevent leakage. Open the butterfly valve to discharge the material and close the butterfly valve to seal it. The size of the butterfly valve is DN100. 7. The upper cover of the flotation machine is made of PP material; 8. Box material: 4mm carbon steel; 9. The weight of the whole machine is about 0.5 tons.

[0023] During use, the amount of reagents used is reduced to reduce costs. The first flotation adopts combined use of reagents, that is, a mixture of cations and anions, and the second flotation adds cationic reagents to directional remove impurities that were not selected in the first flotation, thereby improving the impurity removal accuracy and obtaining high-purity quartz.

[0024] The impurity residue test results of the high-purity quartz sand obtained through this process are shown in the following table: The raw materials of this application can be granitic pegmatite (albite granite) and vein quartz. The main minerals of granitic pegmatite ore properties are plagioclase and quartz, and also contain a certain amount of potassium feldspar, muscovite and biotite, a small amount of tourmaline, apatite, garnet, trace magnetite, sphene, etc. The particle sizes of the original ore quartz crystals are not very different, and the quartz particles are in tooth-shaped mosaic combination. The contact boundary between quartz and feldspar is straight or serrated, and the dissemination relationship is relatively simple. The original ore quartz particles contain trace solid inclusions and fluid inclusions. The solid inclusions are mainly microscopic flaky muscovite, needle-shaped gold apatite and short-columnar tourmaline, etc. The fluid inclusions are mainly gas-liquid two-phase inclusions, and there are also some gas-phase and liquid-phase inclusions. The particle sizes of the inclusions are small, mostly distributed in linear or vein-like shapes, and inclusion-bearing daughter crystals are occasionally seen. This process is convenient and easy to control, can effectively remove impurities such as mica, feldspar, and iron-containing minerals. After two flotation operations, the internal impurities are significantly reduced, and the purity of quartz sand can be greatly improved.

[0025] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of this invention.

Claims

1. A process for flotation removal of impurities from high-purity quartz sand, characterized in that: The method comprises the following steps: S1: loading, injecting quartz sand into a flotation machine; S2: performing a first flotation in the flotation machine; S3: emptying the flotation machine once; S4: injecting the quartz sand after the first flotation into the flotation machine again for a second flotation; S5: emptying the machine twice to obtain high-purity quartz sand.

2. The process for flotation removal of impurities from high-purity quartz sand according to claim 1, characterized in that: The flotation in step S2 includes the following steps: S201: adding EDI hot water into the flotation machine and ventilating, wherein the temperature of the EDI hot water is 40-50°C; S202: starting the flotation machine, stirring the quartz sand fully, and then closing the air valve; S203: adding HF acid and adjusting the pH value; S204: adding chemicals, adding mica flotation agent cationic agent and feldspar flotation agent anionic agent and then adding foaming agent; stirring fully for 2-3 minutes after adding the chemicals, and opening the air valve for ventilation and stirring; deciding whether to add water according to the height of the bubbles, and deciding whether to add chemicals according to the amount of impurities in the bubbles during flotation; emptying the water inside the flotation machine after there are no obvious impurities on the surface of the flotation bubbles; S205: after one flotation is completed, rinse with EDI hot water 2-3 times, and open the drain valve for one drain after the PP bucket, filter bag and grate under the flotation machine are ready.

3. The process for flotation removal of impurities from high-purity quartz sand according to claim 1, characterized in that: The secondary flotation in step S4 includes the following steps: S401: adding the pickled quartz into the flotation machine tank by using a crane; S402: adding EDI hot water and ventilating and stirring, and closing the air valve after the quartz sand is fully stirred; S403: adding HF acid and adjusting the pH value; S404: adding medicine, adding the mica flotation agent cationic agent and then the foaming agent; after adding the agent, fully stir for 2-3 minutes and open the air valve for ventilation and stirring; decide whether to add water according to the height of the bubbles, and decide whether to add medicine according to the amount of impurities in the bubbles during flotation; empty the water inside the flotation machine after there are no obvious impurities on the surface of the flotation bubbles; S205: after the first flotation is completed, rinse with EDI hot water 2-3 times, and open the emptying valve for one emptying after the PP bucket, filter bag and grate under the flotation machine are ready.

4. The process for flotation removal of impurities from high-purity quartz sand according to claim 1, characterized in that: During the primary and secondary flotation, HF acid is added to adjust the pH value to 1-3.

5. The process for flotation removal of impurities from high-purity quartz sand according to claim 2, characterized in that: In the S204, the ratio between the cationic agent and the anionic agent is 3:

2.

6. The process for flotation removal of impurities from high-purity quartz sand according to claim 1, characterized in that: The cationic reagents added in the primary flotation and the secondary flotation are any one of dodecylamine, octadecylamine and coconut amine.

7. The process for flotation removal of impurities from high-purity quartz sand according to claim 1, characterized in that: The anion reagent in the primary flotation is any one of sodium petroleum sulfonate, sodium oleate, and sodium dodecyl sulfate.

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