Preparation process of high-purity and high-hydrophobicity quartz sand

Abstract

The invention provides a preparation process of high-purity and high-hydrophobicity quartz sand. The preparation process comprises the following specific preparation steps: step 1, pre-crushing the quartz sand; 2, quartz sand screening treatment; step 3, cleaning and decontaminating the quartz sand; 4, draining type conveying treatment of the quartz sand; step 5, performing multi-stage impurity removal treatment on the quartz sand; step 6, performing hydrophobic processing treatment on the quartz sand; and step 7, performing subsequent drying treatment on the quartz sand. Through the seven steps, the quartz sand can be purified, and the hydrophobicity of the quartz sand can be improved. Quartz sand can be efficiently purified, the high purity of the quartz sand is guaranteed, the purified quartz sand is subjected to hydrophobic treatment through the hydrophobic processing step, and the surface hydrophobicity of the quartz sand can be effectively improved in a manner of waxing the surface of the quartz sand; therefore, the quartz sand can be better suitable for the field with high hydrophobicity requirements.

Description

Technical Field

[0001] The invention relates to the technical field of quartz sand preparation, in particular to a preparation process of high-purity and highly hydrophobic quartz sand. Background Art

[0002] Quartz sand is quartz particles made by crushing quartz stone. Quartz stone is a non-metallic mineral, a hard, wear-resistant, chemically stable silicate mineral. The color of quartz sand is milky white or colorless and translucent, with a Mohs hardness of 7. Quartz sand is an important industrial mineral raw material and a non-chemical hazardous substance. It is widely used in glass, casting, ceramics and fireproof materials, smelting ferrosilicon, metallurgical flux, metallurgy, construction, chemical industry, plastics, rubber, abrasives, filter materials and other industries. High-purity quartz sand needs to be prepared in the production and processing of quartz sand ore.

[0003] However, the existing high-purity quartz sand preparation method has the following problems: the preparation steps of high-purity quartz sand are relatively simple, the purity of quartz sand is not high, and for some quartz sands that need special uses, such as quartz sand for swimming pools, the quartz sand needs to have high hydrophobicity, and the hydrophobicity of existing quartz sands does not meet the requirements, and there is a lack of means to improve the hydrophobicity of quartz sands. Therefore, it is necessary to design corresponding technical solutions to solve the existing technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of high-purity and highly hydrophobic quartz sand, which solves the technical problem that the preparation steps of high-purity quartz sand are relatively simple, the purity of quartz sand is not high, and for some quartz sands that need special uses, for example, quartz sand for swimming pools, the quartz sand needs to have high hydrophobicity, the hydrophobicity of existing quartz sand does not meet the requirements, and there is a lack of means to improve the hydrophobicity of quartz sand.

[0005] To achieve the above object, the present invention provides the following technical solution: a preparation process of high-purity and high-hydrophobic quartz sand, the specific preparation steps are as follows:

[0006] Step 1: Pre-crushing of quartz sand;

[0007] Step 2: Quartz sand screening process;

[0008] Step 3: Quartz sand cleaning and decontamination treatment;

[0009] Step 4: Quartz sand drainage transportation treatment;

[0010] Step 5: Multi-stage impurity removal treatment of quartz sand;

[0011] Step 6: Quartz sand hydrophobic processing;

[0012] Step 7: subsequent drying of quartz sand;

[0013] Through the above seven steps, the quartz sand can be purified and the hydrophobicity of the quartz sand can be improved.

[0014] As a preferred embodiment of the present invention, step one: quartz sand pre-crushing treatment, the selected quartz ore is placed in a crusher, and a jaw crusher, an impact crusher and a sand making machine are used to crush the quartz ore in sequence, the quartzite is continuously and evenly fed into the jaw crusher by a vibrating feeder for coarse crushing, and the coarsely crushed quartzite is fed into the sand making machine by a belt conveyor for fine crushing.

[0015] As a preferred embodiment of the present invention, step 2: quartz sand screening treatment, the crushed fine sand is introduced into the circular vibrating screen to screen out qualified sand and gravel, the quartz sand with a particle size of less than 2 mm is sent to the sand washing machine to clean off the stone powder and dust, and the quartz sand with a particle size of more than 5 mm is re-sent to the crushing system and re-crushed by the impact crusher or sand making machine. The screening and cleaning system and the crushing system together form a strict and ingenious closed-loop cycle to ensure the qualified rate of quartz sand particles.

[0016] As a preferred embodiment of the present invention, step three: quartz sand cleaning and decontamination treatment, the screened and accepted qualified sand and gravel are placed in a cleaning tank according to process standards and the quartz sand is treated with clean water and decontamination with a high-pressure water gun. During the flushing process, the circulation of the quartz sand is ensured so that the quartz sand can be better flushed.

[0017] As a preferred embodiment of the present invention, step four: quartz sand drainage conveying treatment, the cleaned quartz sand is placed on a conveyor for conveying, and leakage holes with a specification of less than 1 mm are opened on the surface of the conveyor belt, which can drain the surface moisture during the flow of the quartz sand.

[0018] As a preferred embodiment of the present invention, step five: multi-stage impurity removal treatment of quartz sand, a magnetic separation: utilizing the magnetic difference of various ores or materials, through quartz sand magnetic separation equipment to carry out separation under the action of magnetic force, remove the iron-type strong magnetic substances contained in the quartz sand, and can also remove the weak magnetic substances, b acid leaching: using a mixed acid of HCl and HF in a certain proportion to soak for 3 days to remove metal oxides and part of silicate minerals soluble in acid, c flotation: placing the quartz sand after acid leaching in a flotation machine, and sorting according to the difference in the physical and chemical properties of the surface of the mineral particles and the difference in the flotation of the minerals, gravity separation: using a shaking table with appropriate water flow for gravity separation to reduce the mica content, after the treatment is completed, the quartz sand is air-dried.

[0019] As a preferred embodiment of the present invention, step six: hydrophobic processing of quartz sand, placing the dried quartz sand in a stirring container and pouring molten paraffin into the stirring container, stirring the quartz sand at a speed of 1200 revolutions per minute through a built-in stirring rod during the pouring process and maintaining the internal temperature at 100°C-150°C, and continuing to stir for 30 minutes, then discharging the molten paraffin and ensuring that the quartz sand remains in the stirring container, after the molten paraffin is discharged from the outer wall, the internal quartz sand continues to be stirred and cooled, stirring for 1h-1.5h, and continuously pouring water into the interior during the stirring process to cool the quartz sand, so that the paraffin is wrapped on the surface of the quartz sand to ensure the hydrophobicity of the quartz sand.

[0020] As a preferred embodiment of the present invention, step seven: subsequent drying of the quartz sand, the quartz sand processed in the previous step is spread on the bare ground for natural drying.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention optimizes the existing quartz sand purification steps. The purification of quartz sand is completed in sequence through seven steps of pre-crushing, screening, cleaning and decontamination, drainage-type transportation, multi-stage impurity removal, hydrophobic processing and drying. The quartz sand can be efficiently purified to ensure the high purity of the quartz sand. The purified quartz sand is hydrophobicized through the hydrophobic processing step. The hydrophobicity of the quartz sand surface can be effectively improved by waxing the quartz sand surface, so that the quartz sand can be better applied to fields with high requirements for hydrophobicity.

[0023] 2. The method for preparing high-purity and highly hydrophobic quartz sand designed in the present invention can improve the hydrophobicity of quartz sand on the basis of efficiently purifying quartz sand. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] A preparation process of high-purity and high-hydrophobic quartz sand, the specific preparation steps are as follows: step one: quartz sand pre-crushing treatment; step two: quartz sand screening treatment; step three: quartz sand cleaning and decontamination treatment; step four: quartz sand drainage conveying treatment; step five: quartz sand multi-stage impurity removal treatment; step six: quartz sand hydrophobicity processing treatment; step seven: quartz sand subsequent drying treatment, through the above seven steps, the quartz sand can be purified and the hydrophobicity of the quartz sand can be improved.

[0026] Step 1: Pre-crushing of quartz sand. Place the selected quartz ore in the crusher. Use jaw crusher, impact crusher and sand making machine to crush the quartz ore in turn. The quartzite is continuously and evenly fed into the jaw crusher by the vibrating feeder for coarse crushing. The coarsely crushed quartzite is sent to the sand making machine by a belt conveyor for fine crushing.

[0027] Step 2: Quartz sand screening treatment. The fine sand after crushing treatment is introduced into the circular vibrating screen to screen out qualified sand and gravel. The quartz sand with a particle size below 2mm is sent to the sand washing machine to clean off the stone powder and dust. The quartz sand above 5mm is sent back to the crushing system and crushed again by the impact crusher or sand making machine. The screening and cleaning system and the crushing system together form a strict and ingenious closed-loop cycle to ensure the qualified rate of quartz sand particles.

[0028] Step 3: Quartz sand cleaning and decontamination treatment. The qualified sand and gravel that have been screened out are placed in the cleaning pool according to the process standards and the quartz sand is treated with clean water and decontamination with a high-pressure water gun. During the flushing process, the circulation of the quartz sand is ensured to ensure better flushing of the quartz sand.

[0029] Step 4: Drainage-type conveying treatment of quartz sand. The cleaned quartz sand is placed on a conveyor for transportation. The surface of the conveyor belt is provided with leakage holes with a size less than 1 mm, which can drain the surface moisture during the flow of the quartz sand.

[0030] Step 5: Multi-stage impurity removal treatment of quartz sand, a magnetic separation: using the magnetic difference of various ores or materials, through the quartz sand magnetic separation equipment to separate under the action of magnetic force, remove the iron-type strong magnetic substances contained in the quartz sand, and can also remove weak magnetic substances, b acid leaching: using a mixed acid of HCl and HF in a certain proportion to soak for 3 days to remove metal oxides and some silicate minerals soluble in acid, c flotation: placing the acid-leached quartz sand in a flotation machine, according to the different physical and chemical properties of the mineral particle surface, according to the difference in mineral floatability, gravity separation: using a shaking table with appropriate water flow for gravity separation to reduce the mica content, after the treatment is completed, the quartz sand is dried in the sun.

[0031] Step 6: Hydrophobic processing of quartz sand. Place the dried quartz sand in a stirring container and pour molten paraffin into the stirring container. During the pouring process, stir the quartz sand at a speed of 1200 revolutions per minute through the built-in stirring rod and maintain the internal temperature at 120°C. Continue stirring for 30 minutes, then discharge the molten paraffin and ensure that the quartz sand remains in the stirring container. After the molten paraffin is discharged from the outer wall, continue to stir and cool the internal quartz sand. Stir for 11.2 hours. During the stirring process, continuously pour water into the interior to cool the quartz sand, so that the paraffin is wrapped on the surface of the quartz sand to ensure the hydrophobicity of the quartz sand.

[0032] Step 7: Follow-up drying of the quartz sand: Spread the quartz sand processed in the previous step on the bare ground and let it dry naturally.

[0033] The purification of quartz sand in the present invention is completed through seven steps of pre-crushing, screening, cleaning and decontamination, drainage-type transportation, multi-stage impurity removal, hydrophobic processing and drying treatment in sequence, and the quartz sand can be efficiently purified to ensure the high purity of the quartz sand. The purified quartz sand is subjected to hydrophobic treatment through the hydrophobic processing step, and the hydrophobicity of the surface of the quartz sand is effectively improved by waxing the surface of the quartz sand, so that the quartz sand can be better applied to fields with high requirements for hydrophobicity.

[0034] Embodiment 2:

[0035] A preparation process of high-purity and high-hydrophobic quartz sand, the specific preparation steps are as follows: step 1: quartz sand pre-crushing treatment; step 2: quartz sand screening treatment; step 3: quartz sand cleaning and decontamination treatment;

[0036] Step 4: Drainage-type conveying treatment of quartz sand; Step 5: Multi-stage impurity removal treatment of quartz sand; Step 6: Subsequent drying treatment of quartz sand. Through the above six steps, the quartz sand can be purified and the hydrophobicity of the quartz sand can be improved.

[0037] Step 1: Pre-crushing of quartz sand. Place the selected quartz ore in the crusher. Use jaw crusher, impact crusher and sand making machine to crush the quartz ore in turn. The quartzite is continuously and evenly fed into the jaw crusher by the vibrating feeder for coarse crushing. The coarsely crushed quartzite is sent to the sand making machine by a belt conveyor for fine crushing.

[0038] Step 2: Quartz sand screening treatment. The fine sand after crushing treatment is introduced into the circular vibrating screen to screen out qualified sand and gravel. The quartz sand with a particle size below 2mm is sent to the sand washing machine to clean off the stone powder and dust. The quartz sand above 5mm is sent back to the crushing system and crushed again by the impact crusher or sand making machine. The screening and cleaning system and the crushing system together form a strict and ingenious closed-loop cycle to ensure the qualified rate of quartz sand particles.

[0039] Step 3: Clean and decontaminate the quartz sand. Put the screened and qualified sand and gravel into the cleaning pool according to the process standards, and use a high-pressure water gun to clean and decontaminate the quartz sand with clean water. During the flushing process, ensure the circulation of the quartz sand to ensure better flushing of the quartz sand.

[0040] Step 4: Drainage-type conveying treatment of quartz sand. The cleaned quartz sand is placed on a conveyor for transportation. The surface of the conveyor belt is provided with leakage holes with a size less than 1 mm, which can drain the surface moisture during the flow of the quartz sand.

[0041] Step 5: Multi-stage impurity removal treatment of quartz sand, a magnetic separation: using the magnetic difference of various ores or materials, through the quartz sand magnetic separation equipment to separate under the action of magnetic force, remove the iron-type strong magnetic substances contained in the quartz sand, and can also remove weak magnetic substances, b acid leaching: using a mixed acid of HCl and HF in a certain proportion to soak for 3 days to remove metal oxides and some silicate minerals soluble in acid, c flotation: placing the acid-leached quartz sand in a flotation machine, according to the different physical and chemical properties of the mineral particle surface, according to the difference in mineral floatability, gravity separation: using a shaking table with appropriate water flow for gravity separation to reduce the mica content, after the treatment is completed, the quartz sand is dried in the sun.

[0042] Step 6: Follow-up drying of the quartz sand: Spread the quartz sand processed in the previous step on the bare ground and let it dry naturally.

[0043] The purification of quartz sand in the present invention is completed in sequence through six steps of pre-crushing, screening, cleaning and decontamination, drainage-type transportation, multi-stage impurity removal and drying treatment, and the quartz sand can be efficiently purified to ensure the high purity of the quartz sand.

[0044] Specifically, quartz sand was purified according to the above two groups of production and preparation methods, and 500 kg of purified quartz sand was used as raw material for purification in each embodiment, as shown in the following table:

[0045] Experimental Group Quartz sand raw material / kg Purification rate / % Impurity content / % Hydrophobicity Example 1 500 87.4 0.1 excellent Example 2 500 86.7 0.3 Difference

[0046] In addition, it can be learned from the above comparison parameters that the purification of quartz sand is completed in seven steps of pre-crushing, screening, cleaning and decontamination, drainage-type transportation, multi-stage impurity removal, hydrophobic processing and drying. The quartz sand can be efficiently purified to ensure the high purity of the quartz sand, and the purified quartz sand is hydrophobically treated through the hydrophobic processing step. By waxing the surface of the quartz sand, the hydrophobicity of the surface of the quartz sand can be effectively improved, so that the quartz sand can be better suitable for fields with high requirements for hydrophobicity. The designed high-purity and high-hydrophobic quartz sand preparation method can improve the hydrophobicity of quartz sand on the basis of efficient purification of quartz sand.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing high-purity and highly hydrophobic quartz sand, characterized in that: The specific preparation steps are as follows: Step 1: Pre-crushing of quartz sand; Step 2: Quartz sand screening process; Step 3: Quartz sand cleaning and decontamination treatment; Step 4: Quartz sand drainage transportation treatment; Step 5: Multi-stage impurity removal treatment of quartz sand; Step 6: Quartz sand hydrophobic processing; Step 7: subsequent drying of quartz sand; Through the above seven steps, the quartz sand can be purified and the hydrophobicity of the quartz sand can be improved.

2. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 1: Pre-crushing of quartz sand. Place the selected quartz ore in the crusher. Use jaw crusher, impact crusher and sand making machine to crush the quartz ore in turn. The quartzite is continuously and evenly fed into the jaw crusher by the vibrating feeder for coarse crushing. The coarsely crushed quartzite is sent to the sand making machine by a belt conveyor for fine crushing.

3. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 2: Quartz sand screening treatment. The fine sand after crushing treatment is introduced into the circular vibrating screen to screen out qualified sand and gravel. The quartz sand with a particle size below 2mm is sent to the sand washing machine to clean off the stone powder and dust. The quartz sand above 5mm is sent back to the crushing system and crushed again by the impact crusher or sand making machine. The screening and cleaning system and the crushing system together form a strict and ingenious closed-loop cycle to ensure the qualified rate of quartz sand particles.

4. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 3: Quartz sand cleaning and decontamination treatment. The qualified sand and gravel that have been screened out are placed in the cleaning pool according to the process standards and the quartz sand is treated with clean water and decontamination with a high-pressure water gun. During the flushing process, the circulation of the quartz sand is ensured to ensure better flushing of the quartz sand.

5. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 4: Drainage-type conveying treatment of quartz sand. The cleaned quartz sand is placed on a conveyor for transportation. The surface of the conveyor belt is provided with leakage holes with a size less than 1 mm, which can drain the surface moisture during the flow of the quartz sand.

6. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 5: Multi-stage impurity removal treatment of quartz sand, a magnetic separation: using the magnetic difference of various ores or materials, through the quartz sand magnetic separation equipment to separate under the action of magnetic force, remove the iron-type strong magnetic substances contained in the quartz sand, and can also remove weak magnetic substances, b acid leaching: using a mixed acid of HCl and HF in a certain proportion to soak for 3 days to remove metal oxides and some silicate minerals soluble in acid, c flotation: placing the acid-leached quartz sand in a flotation machine, according to the different physical and chemical properties of the mineral particle surface, according to the difference in mineral floatability, gravity separation: using a shaking table with appropriate water flow for gravity separation to reduce the mica content, after the treatment is completed, the quartz sand is dried in the sun.

7. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 6: Hydrophobic processing of quartz sand. Place the dried quartz sand in a stirring container and pour molten paraffin into the stirring container. During the pouring process, the quartz sand is stirred at a speed of 1200 revolutions per minute through the built-in stirring rod and the internal temperature is maintained at 100℃-150℃. Stirring is continued for 30 minutes, and then the molten paraffin is discharged and the quartz sand is retained in the stirring container. After the molten paraffin is discharged from the outer wall, the internal quartz sand is continued to be stirred and cooled for 1h-1.5h. During the stirring process, water is continuously poured into the interior to cool the quartz sand, so that the paraffin is wrapped on the surface of the quartz sand to ensure the hydrophobicity of the quartz sand.

8. A process for preparing high-purity and highly hydrophobic quartz sand according to claim 1, characterized in that: Step 7: Follow-up drying of the quartz sand: Spread the quartz sand processed in the previous step on the bare ground and let it dry naturally.