A method for dissociating high-roughness quartz sand

Abstract

The present invention discloses a method for dissociating high-roughness quartz sand. The dissociation method comprises the following steps: classifying the quartz sand sample according to the particle size; preparing the classified sample into a slurry, adding a regulator and a dispersant and stirring, then ultrasonically scrubbing until neutral, filtering and drying to obtain materials of various particle sizes; screening the -2mm+0.6mm particle size material, screening out the +0.6mm particle size quartz sand, grinding to the required particle size, and obtaining a first quartz sand sample; screening the -0.6mm+0.1mm particle size material, screening out the +0.1mm particle size quartz sand, and obtaining a second quartz sand sample. The first and second quartz sand samples are quartz sand after monomer dissociation. The present invention adopts a pretreatment process of crushing-grading scrubbing-grinding, and uses mechanical force to separate clay minerals and iron oxide film from the quartz surface through high-concentration scrubbing of the particle size, thereby improving the yield of qualified particle size quartz sand and the mineral processing efficiency.

Description

Technical Field

[0001] The invention belongs to the field of quartz sand beneficiation, and in particular relates to a method for dissociating high-roughness quartz sand. Background Art

[0002] With the rapid development of the semiconductor and photovoltaic industries, the demand for high-quality quartz raw materials has reached a point where supply outstrips demand. With the increasing depletion of high-grade, high-purity quartz resources, such as crystal, the source of high-purity quartz has gradually shifted to relatively lower-grade mineral resources such as pegmatite, vein quartz, quartzite, and quartz sand. These high-purity quartz raw materials are extracted through complex purification techniques. The high-purity quartz industry has very strict quality requirements for quartz sand, typically requiring a SiO2 content of at least 99.9% and a particle size within the range of -0.6 to +0.1mm.

[0003] Impurities in quartz ore mainly exist in the following forms: (1) mineral impurities with relatively high dissociation degree, including associated minerals, clay mineral impurities, etc.; (2) inclusion impurities; (3) structural impurities in the crystal lattice. The existence form of impurities in quartz ore determines the specific process of high-purity quartz purification in the later stage. Among them, the first type of impurities are non-structural component impurities, which are relatively easy to remove. Usually, physical purification (such as magnetic separation, flotation, etc.) can achieve good impurity removal effect; while the second and third types are structural component impurities. Such impurities usually need to be effectively removed by chemical purification or physical-chemical combined means.

[0004] Before physical and chemical purification, the raw ore undergoes pretreatment processes such as crushing and grinding to separate the quartz from the impurities. This allows for optimal separation in subsequent purification steps, such as magnetic separation and flotation. The goal of the pretreatment stage is to initially screen for impurities or to effectively separate the minerals from the raw quartz through crushing and grinding, achieving the particle size required for subsequent processing. After pretreatment, the quartz sand typically undergoes further scrubbing and desludging to remove iron oxides and clay adhering to the surface.

[0005] Traditional pretreatment processes include crushing, grinding (sometimes accompanied by scrubbing), and desludging. For quartz sands with a high degree of clay and iron oxide cementation and a high surface roughness, the gangue minerals are often embedded in fine particles. To achieve the separation of quartz from the gangue minerals, the grinding process often results in over-fine grinding, which reduces the yield of qualified quartz sand. Furthermore, after grinding, the separation of surface impurities from the quartz sand is incomplete, and the quartz particles may still retain cemented clay impurities and an iron oxide film. Due to the fine particle size, even scrubbing is often ineffective in removing impurities, ultimately affecting product quality. Scrubbing utilizes mechanical force and friction between sand particles to remove iron film and adherent impurities from the quartz sand surface. However, due to the uneven particle size, scrubbing cannot completely remove all surface impurities, which not only prolongs scrubbing time but also reduces efficiency. Therefore, it is crucial to develop an efficient dissociation method for quartz sand with high roughness, which will help improve the output of quartz sand with standard particle size and the overall efficiency of mineral processing. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for separating high-roughness quartz sand. This method utilizes a pretreatment process consisting of crushing, graded scrubbing, and grinding. Through high-concentration scrubbing at the graded particle size, clay minerals and iron oxide films are mechanically separated from the quartz surface. Simultaneously, the cavitation effect of ultrasound (introduced during the ultrasonic scrubbing step) vibrates the slurry, accelerating the separation of quartz from surface impurities such as clay and iron oxide. Compared to the traditional crushing-grinding-(scrubbing) desludging method, this new method fully guarantees the yield of qualified graded quartz sand and improves beneficiation efficiency.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A method for dissociating high-roughness quartz sand comprises the following steps:

[0009] (1) Classify the quartz sand samples according to particle size;

[0010] (2) The classified samples are prepared into slurries, and according to the properties of the quartz sand, a regulator and a dispersant are selectively added and stirred; each slurry is then ultrasonically scrubbed until the slurry is neutral, filtered and dried to obtain materials of the corresponding particle size;

[0011] (3) Screening the material with a particle size of -2mm+0.6mm to screen out the quartz sand with a particle size of +0.6mm, and then grinding it to the required particle size according to the requirements of subsequent selection to obtain the first quartz sand sample; Screening the material with a particle size of -0.6mm+0.1mm to screen out the quartz sand with a particle size of +0.1mm to obtain the second quartz sand sample; the first quartz sand sample and the second quartz sand sample are the quartz sand after monomer dissociation.

[0012] Preferably, in step (1), the particle size of the quartz sand sample is -2 mm + 0.1 mm.

[0013] Preferably, the method of classifying according to particle size in step (1) is: according to the particle size range of the sample, it is divided into -2mm+1mm particle size, -1mm+0.6mm particle size, -0.6mm+0.3mm particle size and -0.3mm+0.1mm particle size.

[0014] Preferably, in step (2), the concentration of the slurry is 60-70 wt %, and the stirring time is 5-10 min.

[0015] Preferably, in step (2), the stirring method is: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the stirring rate is 1600~2000rpm; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the stirring rate is 800~1300rpm.

[0016] Preferably, in step (2), the specific method of ultrasonically scrubbing each slurry is as follows: for samples of -2mm+1mm particle size and -1mm+0.6mm particle size, scrubbing is performed at an ultrasonic frequency of 20-80KHz and an ultrasonic power of 500-600W for 20-40min; for samples of -0.6mm+0.3mm particle size and -0.3mm+0.1mm particle size, scrubbing is performed at an ultrasonic frequency of 20-80KHz and an ultrasonic power of 500-600W for 10-20min.

[0017] Preferably, in step (2), the amount of the regulator added is specifically as follows: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the amount of the regulator added is 500~2000g / t; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the amount of the regulator added is 500~2000g / t.

[0018] Preferably, in step (2), the amount of dispersant added is specifically as follows: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the amount of dispersant added is 5000~15000 g / t; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the amount of dispersant added is 300~1000 g / t.

[0019] Preferably, in step (2), a regulator is added according to the properties of the quartz sand, and the regulator is an acidic or alkaline substance; specifically, an alkaline regulator, such as sodium hydroxide or sodium carbonate, is added to quartz sand containing organic matter; and an acidic regulator, such as an inorganic acid such as hydrochloric acid or hydrofluoric acid, or an organic acid such as oxalic acid, is added to quartz sand with a high iron impurity content.

[0020] Preferably, in step (2), a dispersant is added according to the properties of the quartz sand. Specifically, a dispersant is added to the quartz sand with a high clay mineral content, and the dispersant is at least one of sodium hexametaphosphate, sodium pyrophosphate, sodium silicate, sodium citrate and sodium tripolyphosphate.

[0021] Preferably, in step (3), the first quartz sand sample and the second quartz sand sample are further purified to obtain quartz concentrate.

[0022] The mechanism involved in the present invention is:

[0023] Monomer dissociation is a fundamental condition for quartz sand sorting and purification, directly impacting subsequent sorting processes and purification indicators. For quartz sand with a high degree of clay and iron oxide cementation and high surface roughness, iron oxide and clay impurities may still adhere to the quartz particle surface even after crushing. Therefore, after classification, scrubbing is first performed to remove these impurities from the quartz surface. Then, coarse-grained samples (-2mm + 1mm and -1mm + 0.6mm fractions) are ground to the appropriate particle size. This can significantly reduce overgrinding and increase the yield of qualified quartz sand. Furthermore, scrubbing narrow-grained samples (-0.6mm + 0.3mm and -0.3mm + 0.1mm fractions) enhances the scrubbing effect, ensuring more thorough abrasion between quartz sand particles and more complete impurity removal.

[0024] During ultrasonic scrubbing, using specific conditioning agents and dispersants tailored to the specific properties of quartz sand can enhance impurity removal. Under strongly acidic conditions, most iron-containing impurity minerals dissolve, while quartz sand does not. Therefore, adding acid can effectively improve the removal of iron-containing impurity minerals. Alkaline agents, on the other hand, are beneficial for removing organic matter from quartz sand. Furthermore, under alkaline conditions, the zeta potential of quartz and some gangue minerals (such as feldspar and hematite) is negative. By manipulating the surface electrical properties of quartz and impurity minerals and increasing electrostatic repulsion, clay impurity removal can be enhanced. Furthermore, the use of dispersants can significantly reduce slurry viscosity and improve quartz recovery, especially for quartz sand with a high clay mineral content. The cavitation, mechanical, and thermal effects of ultrasound help remove impurities and iron oxide films deposited and adsorbed on the surface of quartz sand, thereby enhancing monomer dissociation.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) For high-roughness quartz sand, the pretreatment process of "crushing-grading scrubbing-grinding" can achieve more efficient monomer dissociation of quartz. The scrubbing process before grinding can pre-dissociate impurity minerals, and then the required quartz particle size range can be obtained through grinding, thereby minimizing the over-grinding of quartz sand caused by the dissociation of impurity minerals and ensuring the yield of quartz sand of qualified particle size.

[0027] (2) Ultrasonic scrubbing of narrow particle sizes is more efficient than scrubbing of mixed particle sizes, and the grinding between the gravels is more thorough. At the same time, under the cavitation effect of ultrasound, the dissociation of iron oxide and impurity minerals on the quartz surface is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the quartz sand dissociation process of the present invention and the traditional method, wherein the left figure corresponds to the traditional method and the right figure corresponds to the method of the present invention.

[0029] Figure 2 Schematic diagram comparing the effects of the narrow-size scrubbing method of the present invention and traditional mixed scrubbing. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Example 1

[0032] A method for dissociating high-roughness quartz sand, comprising the following steps:

[0033] (1) Quartz sand from Dongshan, Fujian Province was selected. The -0.6mm+0.1mm particle size accounted for 97.21% of the quartz sand, which met the particle size requirements for glass sand. Therefore, no crushing and grinding processes were required. The material was sieved using a standard wet screening method to separate the material into -0.6mm+0.3mm particle size and -0.3mm+0.1mm particle size.

[0034] (2) Deionized water was used to prepare the -0.6mm + 0.3mm and -0.3mm + 0.1mm slurries with a concentration of 60%, and NaOH solution (concentration of 1%) was added to each of them according to the standard of 500g / t and then stirred. Specifically, the material of -0.6mm + 0.3mm slurry was stirred at a rate of 1000rpm for 5min, and the material of -0.3mm + 0.1mm slurry was stirred at a rate of 800rpm for 5min. After stirring, each slurry was ultrasonically scrubbed. Specifically, the samples of -0.6mm + 0.3mm slurry and -0.3mm + 0.1mm slurry were scrubbed at an ultrasonic frequency of 40KHz and an ultrasonic power of 550W for 20min. After ultrasonic scrubbing, deionized water is used to wash the ore pulp until it is neutral, and then filtered and dried to obtain materials of corresponding particle sizes. The materials of corresponding particle sizes are mixed to obtain quartz sand after monomer dissociation.

[0035] (3) The quartz sand after monomer dissociation was subjected to three-stage magnetic separation with a magnetic separation intensity of 1.4 T, a pulse frequency of 200 r / min, and a flow rate of 2.0 cm / s. The magnetically separated concentrate was then acid-leached under the following conditions: temperature 80°C, acid type 10wt% oxalic acid solution plus 1wt% hydrofluoric acid solution, liquid-to-solid ratio 1mL:1g, and acid leaching time 8h. After acid leaching, the sample was washed to neutrality to obtain quartz concentrate.

[0036] The quartz concentrate described in Example 1 was subjected to ICP testing, and the iron oxide content was 105 μg / g, the aluminum oxide content was 4023 μg / g, and the quartz concentrate yield was 94.56%.

[0037] Comparative Example 1

[0038] A method for dissociating quartz sand, comprising the following steps:

[0039] (1) Quartz sand from Dongshan, Fujian Province was selected. The -0.6mm+0.1mm particle size of the quartz sand accounted for 97.21%, which met the particle size requirements of glass sand. Therefore, crushing and grinding processes were not required.

[0040] (2) Using deionized water, the -0.6mm +0.1mm particle size material was prepared into a 60% slurry. NaOH solution (concentration: 1%) was added to each of the materials at a standard of 500g / t. The mixture was then stirred at a speed of 1000rpm for 5 minutes. After stirring, the slurry was ultrasonically scrubbed at a frequency of 40kHz, a power of 550W, and a scrubbing time of 20 minutes. After ultrasonic scrubbing, the slurry was washed with deionized water until it was neutral, filtered, and dried to obtain quartz sand after monomer dissociation.

[0041] (3) The quartz sand after monomer dissociation was subjected to magnetic separation and acid leaching according to the method of Example 1 to obtain quartz concentrated sand.

[0042] The quartz concentrate described in Comparative Example 1 was subjected to ICP detection, and the iron oxide content was 127 μg / g, the aluminum oxide content was 4916 μg / g, and the quartz concentrate yield was 90.28%.

[0043] Example 2

[0044] A method for dissociating high-roughness quartz sand, comprising the following steps:

[0045] (1) Quartz ore from the Shimen area of ​​Hunan Province was selected for crushing. After a closed-circuit crushing process, the experimental quartz sandstone blocks were crushed to less than 3 mm. Then, the crushing fineness was reduced to +0.1 mm with a yield of 90%. The +0.1 mm quartz sand (qualified quartz sand) was taken for use. The +0.1 mm quartz sand was sieved by wet screening using a standard sieve to separate it into three quartz grades: +0.6 mm, -0.6 mm + 0.3 mm, and -0.3 mm + 0.1 mm.

[0046] (2) Prepare 60% ore slurry with deionized water, add regulator and dispersant, stir for 5 minutes, and then perform ultrasonic scrubbing. Specifically:

[0047] For the +0.6 mm particle size, a 3% NaOH solution was added at a standard of 500 g / t, and a 10% sodium hexametaphosphate solution was added at a standard of 5000 g / t, with stirring at a rate of 1600 rpm. The ultrasonic scrubbing frequency was 40 kHz, the power was 550 W, and the scrubbing time was 25 minutes. The scrubbed quartz sand was washed with deionized water until the water was clear, filtered, and dried. The +0.6 mm particle size after ultrasonic scrubbing was ground at a grinding concentration of 60%, using a rod mill as the grinding medium, and the grinding fineness was 80% of the -0.6 mm +0.1 mm particle size. After grinding, the -0.6 mm +0.1 mm particle size product was screened and graded for later use, which was recorded as quartz sand sample 1.

[0048] For the -0.6mm+0.3mm particle size material, NaOH solution (concentration of 1.5%) and sodium hexametaphosphate solution (concentration of 1.5%) were added at a standard of 500g / t, respectively, with a stirring rate of 1000rpm. The ultrasonic scrubbing frequency was 40kHz, the power was 550W, and the scrubbing time was 20min. The scrubbed quartz sand was washed with deionized water until the water was clear, filtered, and dried; this was recorded as quartz sand sample 2.

[0049] For the -0.3mm + 0.1mm particle size, 500g / t of each was added with a 1.5% NaOH solution and a 1.5% sodium hexametaphosphate solution. The stirring rate was 800 rpm. The ultrasonic scrubbing frequency was 40 kHz, the power was 550 W, and the scrubbing time was 20 minutes. The scrubbed quartz sand was washed with deionized water until the water was clear, filtered, and dried. This is designated as quartz sand sample three.

[0050] The quartz sand sample 1, the quartz sand sample 2 and the quartz sand sample 3 are mixed to obtain quartz sand after monomer dissociation.

[0051] (3) The quartz sand after monomer dissociation was subjected to three-stage magnetic separation. The magnetic separation medium was a fine steel rod, the magnetic separation intensity was 1.4 T, the pulse frequency was 200 r / min, and the flow rate was 1.0 cm / s. The magnetic separation concentrate was then acid-leached under the following conditions: temperature 85°C, acid type 10wt% oxalic acid solution plus 1wt% hydrofluoric acid solution, liquid-solid ratio 1mL:1g, and acid leaching time 6h. After acid leaching, the sample was washed to neutrality to obtain quartz concentrate.

[0052] The quartz concentrate described in Example 2 was subjected to ICP detection, and the iron oxide content was 82.43 μg / g, the aluminum oxide content was 478.24 μg / g, and the quartz concentrate yield was 82.21%.

[0053] Comparative Example 2

[0054] A method for dissociating quartz sand, comprising the following steps:

[0055] (1) Quartz ore was selected from Shimen, Hunan Province, and the large blocks of quartz sandstone used in the experiment were crushed to less than 3 mm through a closed-circuit crushing process. The crushed materials were ground with a grinding concentration of 60%. The grinding medium was a rod mill, and the grinding fineness was -0.6 mm + 0.1 mm. The particle size content was 80%. After grinding, the -0.6 mm + 0.1 mm particle size product was screened out for use.

[0056] (2) Using deionized water, the -0.6mm +0.1mm particle size material was prepared into a 60% slurry. NaOH solution (concentration of 1.5%) and sodium hexametaphosphate solution (concentration of 1.5%) were added to each of the materials at a standard of 500g / t. The mixture was then stirred at a speed of 1000rpm for 5 minutes. After stirring, the slurry was ultrasonically scrubbed at a frequency of 40KHz, a power of 550W, and a scrubbing time of 20 minutes. After ultrasonic scrubbing, the slurry was washed with deionized water until it was neutral, filtered, and dried to obtain quartz sand after monomer dissociation.

[0057] (3) The quartz sand after monomer dissociation was subjected to magnetic separation and acid leaching according to the method of Example 2 to obtain quartz concentrated sand.

[0058] The quartz concentrate described in Comparative Example 2 was subjected to ICP testing, and the iron oxide content was 94.04 μg / g, the aluminum oxide content was 569.25 μg / g, and the quartz concentrate yield was 71.05%.

[0059] Example 3

[0060] A method for dissociating high-roughness quartz sand, comprising the following steps:

[0061] (1) Angolan quartz ore was selected for crushing. After a closed-circuit crushing process, the experimental quartz sandstone blocks were crushed to less than 3 mm. Then, the crushing fineness was reduced to -2 mm + 0.1 mm with a yield of 95%. The +0.1 mm quartz sand (qualified quartz sand) was taken for use. The +0.1 mm quartz sand was wet-screened and sieved using a standard sieve to form four quartz sands: -2 mm + 1 mm, -1 mm + 0.6 mm, -0.6 mm + 0.3 mm, and -0.3 mm + 0.1 mm.

[0062] (2) Prepare 65% ore slurry with deionized water, add regulator and dispersant, stir for 5 minutes, and then perform ultrasonic scrubbing. Specifically:

[0063] For materials with a particle size of -2mm + 1mm, oxalic acid solution (concentration of 1%) was added at a standard of 500g / t, and the stirring speed was 1800rpm. The ultrasonic scrubbing frequency was 40KHz, the power was 550W, and the scrubbing time was 25min. The scrubbed quartz sand was washed with deionized water until the water was clear, filtered, and dried.

[0064] For materials with a particle size of -1mm + 0.6mm, oxalic acid solution (concentration of 1%) was added at a standard of 500g / t, with a stirring rate of 1600rpm. The ultrasonic scrubbing frequency was 40kHz, the power was 550W, and the scrubbing time was 20min. The scrubbed quartz sand was washed with deionized water until the water was clear, filtered, and dried.

[0065] The -2mm+1mm and -1mm+0.6mm particle sizes that have been scrubbed and washed are mixed and ground at a grinding concentration of 60%. The grinding medium is a rod mill, and the grinding fineness is 80% of the -0.6mm+0.1mm particle size. After grinding, the -0.6mm+0.1mm particle size product is screened out for use and recorded as sample 1.

[0066] For the -0.6mm + 0.3mm particle size, 1% oxalic acid solution was added to each sample at a standard concentration of 500g / t, with a stirring rate of 1000rpm. Ultrasonic scrubbing was performed at a frequency of 40kHz, a power of 550W, and a scrubbing time of 15min. The scrubbed quartz sand was washed with deionized water until clear, filtered, and dried. This was designated as Sample 2.

[0067] For the -0.3mm + 0.1mm particle size, 500g / t of oxalic acid solution (1%) was added to each sample, stirring at 800rpm. Ultrasonic scrubbing was performed at a frequency of 40kHz, a power of 550W, and a scrubbing time of 15min. The scrubbed quartz sand was washed with deionized water until clear, filtered, and dried. This was designated as Sample 3.

[0068] Sample 1, sample 2 and sample 3 are mixed to obtain quartz sand after monomer dissociation.

[0069] (3) The quartz sand after monomer dissociation was subjected to two-stage flotation to remove mica. The flotation concentration was 30%. The flotation reagent used was dodecylamine, and the dosage for each stage was 100 g / t. HF was used to control the pH to 2.0-3.0. The concentrate after flotation was acid leached using a 4 wt% hydrofluoric acid solution with a solid-liquid volume ratio of 1:3. The acid leaching time was 24 h and the acid leaching temperature was 90°C. After acid leaching, the sample was washed to neutrality, filtered and dried to obtain quartz concentrate.

[0070] The quartz concentrate described in Example 3 was subjected to ICP detection, and the iron content was 0.28 μg / g, the aluminum content was 15.51 μg / g, and the quartz concentrate yield was 80.35%.

[0071] Comparative Example 3

[0072] A method for dissociating quartz sand, comprising the following steps:

[0073] (1) Angolan quartz ore was selected for crushing. After a closed-circuit crushing process, the experimental quartz sandstone blocks were crushed to less than 3 mm. Then, the crushing fineness was -2 mm + 0.1 mm, and the yield was 95%. The + 0.1 mm quartz sand (qualified particle size) was taken for use. The crushed material was ground with a grinding concentration of 60% and a rod mill as the grinding medium. The grinding fineness was -0.6 mm + 0.1 mm, and the content of the particle size was 80%. After grinding, the -0.6 mm + 0.1 mm particle size product was screened out for use.

[0074] (2) Using deionized water, the -0.6mm + 0.1mm particle size material was prepared into a 60% slurry. Oxalic acid solution (concentration: 1%) was added to each of the materials at a standard of 500g / t. The mixture was then stirred at 1000rpm for 5 minutes. After stirring, the slurry was ultrasonically scrubbed at a frequency of 40kHz, a power of 550W, and a scrubbing time of 15 minutes. The scrubbed quartz sand was then washed with deionized water until the water was clear, filtered, and dried to obtain quartz sand after monomer dissociation.

[0075] (3) The quartz sand after monomer dissociation was subjected to flotation and acid leaching according to the method of Example 3 to obtain quartz concentrate.

[0076] The quartz concentrate described in Comparative Example 3 was subjected to ICP detection, and the iron content was 0.43 μg / g, the aluminum content was 16.25 μg / g, and the yield of quartz concentrate was 76.21%.

[0077] The ICP test results of the quartz concentrates prepared in Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1.

[0078] Table 1 Comparison of ICP test results of quartz concentrate

[0079]

[0080] The test results in Table 1 demonstrate that the present invention's narrow-fraction ultrasonic scrubbing followed by selective grinding can increase the yield of qualified quartz concentrate and optimize the dissociation effect. Compared with the traditional crushing-grinding-scrubbing dissociation method, this method can produce quartz sand concentrate with lower impurity content and higher yield.

[0081] Figure 1 Schematic diagram of the quartz sand dissociation process of the present invention and the traditional method, wherein the left figure corresponds to the traditional method and the right figure corresponds to the method of the present invention.

[0082] Figure 2 Schematic diagram comparing the effects of the narrow-size scrubbing method of the present invention and traditional mixed scrubbing.

[0083] from Figures 1 and 2It can be seen that in traditional quartz sand dissociation methods, the sample is not graded after grinding, but the materials of different particle sizes are mixed and scrubbed. The quartz sand obtained by scrubbing still contains a lot of impurities. However, the graded scrubbing method described in this invention can achieve more efficient monomer dissociation of quartz.

[0084] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for dissociating high-roughness quartz sand, characterized in that: The steps include: (1) Classify the quartz sand samples according to particle size; The particle size of the quartz sand sample in step (1) is -2mm+0.1mm; Step (1) is to classify the particles according to their particle size into -2 mm + 1 mm, -1 mm + 0.6 mm, -0.6 mm + 0.3 mm, and -0.3 mm + 0.1 mm, according to the particle size range of the sample. (2) The classified samples are prepared into slurries, and according to the properties of the quartz sand, a regulator and a dispersant are selectively added and stirred; each slurry is then ultrasonically scrubbed until the slurry is neutral, filtered and dried to obtain materials of the corresponding particle size; (3) Screening the material with a particle size of -2mm+0.6mm to screen out the quartz sand with a particle size of +0.6mm, and then grinding it to the required particle size according to the requirements of subsequent selection to obtain the first quartz sand sample; Screening the material with a particle size of -0.6mm+0.1mm to screen out the quartz sand with a particle size of +0.1mm to obtain the second quartz sand sample; the first quartz sand sample and the second quartz sand sample are the quartz sand after monomer dissociation.

2. The method for dissociating high-roughness quartz sand according to claim 1, characterized in that: The concentration of the slurry in step (2) is 60-70 wt%, and the stirring time is 5-10 min.

3. The method for dissociating high-roughness quartz sand according to claim 1, characterized in that: The stirring method in step (2) is: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the stirring rate is 1600~2000rpm; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the stirring rate is 800~1300rpm.

4. The method for dissociating high-roughness quartz sand according to claim 3, characterized in that: The specific method of ultrasonically scrubbing each slurry in step (2) is as follows: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, scrubbing is performed at an ultrasonic frequency of 20-80KHz and an ultrasonic power of 500-600W for 20-40min; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, scrubbing is performed at an ultrasonic frequency of 20-80KHz and an ultrasonic power of 500-600W for 10-20min.

5. The method for dissociating high-roughness quartz sand according to claim 4, characterized in that: The amount of the regulator added in step (2) is specifically as follows: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the amount of the regulator added is 500~2000g / t; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the amount of the regulator added is 500~2000g / t.

6. The method for dissociating high-roughness quartz sand according to claim 5, characterized in that: The amount of the dispersant added in step (2) is specifically as follows: for samples with a particle size of -2mm+1mm and -1mm+0.6mm, the amount of the dispersant added is 5000~15000 g / t; for samples with a particle size of -0.6mm+0.3mm and -0.3mm+0.1mm, the amount of the dispersant added is 300~1000 g / t.

7. The method for dissociating high-roughness quartz sand according to claim 1, characterized in that: The regulator in step (2) is an acidic or alkaline substance; The alkaline substance is at least one of sodium hydroxide and sodium carbonate; The acidic substance is at least one of an organic acid and an inorganic acid; The dispersant is at least one of sodium hexametaphosphate, sodium pyrophosphate, sodium silicate, sodium citrate and sodium tripolyphosphate.

8. The method for dissociating high-roughness quartz sand according to claim 1, characterized in that: Step (3) The first quartz sand sample and the second quartz sand sample are further purified to obtain quartz concentrate.

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