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CN-122010124-A - Method for preparing quartz particles by removing fine kaolinite from kaolin tailings

CN122010124ACN 122010124 ACN122010124 ACN 122010124ACN-122010124-A

Abstract

The invention provides a method for preparing quartz particles by removing fine kaolinite from kaolin tailings, which comprises the following steps of crushing and screening quartz raw ores in the kaolin tailings to obtain first quartz particles with the particle size of 0.106-0.212 mm, calcining the first quartz particles to enable the kaolinite to undergo dehydroxylation phase change into calcined kaolinite to obtain second quartz particles, mechanically scrubbing the second quartz particles to realize preliminary stripping of the calcined kaolinite to obtain third quartz particles, and finally carrying out acid ultrasonic collaborative scrubbing, water washing, filtering and drying treatment on the third quartz particles to obtain the quartz particles. According to the invention, through the co-processing of calcination transformation and mechanochemical treatment, the purity of quartz particles is obviously improved, the quartz utilization bottleneck problem caused by kaolinite residues is effectively solved, and the method is suitable for industrial preparation of high-end quartz materials.

Inventors

  • FENG JIE
  • CHAO LI
  • Dai Leimeng
  • SUN HONGJUAN
  • LIU BO
  • SU XINTING

Assignees

  • 中非高岭茂名新材料有限公司
  • 西南科技大学

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. A method for producing quartz particles from kaolin tailings by removing fine-grained kaolinite, the method comprising the steps of: 1) Crushing and screening kaolin tailings to obtain first quartz particles; 2) Calcining the first quartz particles to obtain second quartz particles; 3) Mechanically scrubbing the second quartz particles to obtain third quartz particles; 4) And carrying out post-treatment on the third quartz particles to obtain quartz particles.
  2. 2. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 1, wherein the content of SiO 2 in the kaolin tailings is 70% -95%, and minerals in the kaolin tailings comprise one or more of kaolin associated quartz, gravel quartz and powder quartz.
  3. 3. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 1, wherein the screening in step 1) is to screen out the first quartz particles with the particle size of 0.106-0.212 mm by a standard analysis screen.
  4. 4. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 1, wherein the calcination in step 2) is performed in a high temperature apparatus, the calcination temperature is 500-700 ℃ and the time is 30-120 min.
  5. 5. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 1, wherein the mechanical scrubbing in the step 3) is performed in a high-speed stirring device, the stirring speed is 200-500 rpm, and the mechanical scrubbing time is 30-120 min.
  6. 6. A method for producing quartz particles from kaolin tailings by removing fine kaolinite therefrom according to claim 1, wherein the post-treatment in step 4) comprises acid ultrasonic scrubbing, water washing, filtering and drying.
  7. 7. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 6, wherein the acid ultrasonic scrubbing is to put the third quartz particles into an acidic medium and carry out deep scrubbing under ultrasonic conditions, and the water scrubbing is to wash the third quartz particles after acid ultrasonic scrubbing by ultrapure water until filtrate is neutral.
  8. 8. The method for preparing quartz particles by removing fine kaolinite from kaolin tailings according to claim 7, wherein the acidic medium is a solution prepared from deionized water and one or more of inorganic acid or organic acid, the concentration of the solution is 0.2-1 mol/L, the inorganic acid comprises hydrochloric acid, nitric acid or sulfuric acid, the organic acid comprises oxalic acid, and the ultrasonic treatment time is 30-120 min.
  9. 9. Quartz granulate, characterized in that it is produced by a process according to any of claims 1 to 8 for the production of quartz granulate by removal of fine kaolin from kaolin tailings.
  10. 10. A quartz granule according to claim 9, wherein the content of SiO 2 in the quartz granule is greater than 97.00%.

Description

Method for preparing quartz particles by removing fine kaolinite from kaolin tailings Technical Field The invention relates to the technical field of high-purity mineral material preparation and resource comprehensive utilization, in particular to a method for preparing quartz particles by removing fine kaolinite from kaolin tailings. Background Kaolin is an important nonmetallic mineral product and is widely applied to the fields of ceramics, papermaking, paint, rubber and the like. The kaolin in China is rich in resources, a large amount of tailing wastes are generated in the exploitation and mineral separation processes, the tailings generally contain more than 90% of quartz, and the kaolin is a high-quality potential raw material for preparing quartz sand from the aspect of components, so that the kaolin has a huge resource utilization prospect. However, since kaolin and quartz are often closely co-formed and mutually embedded in the natural ore-forming process, a large amount of fine-grained kaolinite group minerals (mainly kaolinite) with micron-level or submicron-level still firmly adhere to the surface of quartz particles or are filled in internal microcracks of quartz after conventional crushing, ore grinding and sorting (such as reselection, magnetic separation, flotation and the like) treatment. This close occurrence makes it difficult to effectively remove such impurities by conventional physical beneficiation methods. The residue of kaolinite can introduce a large amount of aluminum impurity elements, so that the chemical purity of quartz is seriously reduced, and the high-value utilization effect of the quartz is reduced. Currently, studies on the purification of quartz from kaolin tailings are still in the primary stage. Conventional treatment methods have significant limitations. The physical method (such as reselection and magnetic separation) is mainly aimed at impurity minerals with larger density or magnetic difference, has very little separation effect on kaolinite with similar physicochemical properties and complex embedding relationship with quartz, can not solve the problems of surface adhesion and crack filling, but the chemical pickling method can dissolve part of aluminum-containing impurities, but is difficult for acid liquor to effectively permeate and contact with kaolinite wrapped by quartz particles or embedded in the depth of narrow cracks, so that the reaction efficiency is low, the acid consumption is large, the treatment period is long, the economical efficiency and the environmental friendliness are not ideal, and the single mechanical scrubbing can remove part of impurities loosely adhered to the surface, but has limited stripping capability on fine kaolinite absorbed by strong forces such as hydrogen bonds, van der Waals and the like, and has insufficient purification depth. Therefore, there is a need to develop an efficient, economical and suitable removal method for large-scale applications to break through the technical bottleneck of quartz purification in kaolin tailings. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the objects of the present invention is to provide a method for preparing quartz particles by removing fine kaolinite from kaolin tailings, and the other object of the present invention is to provide quartz particles. In order to achieve the above object, the present invention provides, in one aspect, a method for preparing quartz particles by removing fine kaolinite from kaolin tailings, the method comprising the steps of: 1) Crushing and screening kaolin tailings to obtain first quartz particles; 2) Calcining the first quartz particles to obtain second quartz particles; 3) Mechanically scrubbing the second quartz particles to obtain third quartz particles; 4) And carrying out post-treatment on the third quartz particles to obtain quartz particles. Optionally, the content of SiO 2 in the kaolin tailing is 70% -95%, and the minerals in the kaolin tailing comprise one or more of kaolin associated quartz, gravel quartz and powder quartz. Optionally, the screening in the step 1) is to screen out the first quartz particles with the particle size of 0.106-0.212 mm through a standard analysis screen. Optionally, the calcination in the step 2) is performed in a high-temperature device, wherein the temperature of the calcination is 500-700 ℃ and the time is 30-120 min. Optionally, the mechanical scrubbing in the step 3) is performed in a high-speed stirring device, the stirring speed is 200-500 rpm, and the mechanical scrubbing time is 30-120 min. Optionally, the post-treatment in step 4) comprises acid ultrasonic scrubbing, water washing, filtration and drying. Optionally, the acid ultrasonic scrubbing is to put the third quartz particles into an acid medium and carry out deep scrubbing under ultrasonic conditions, and the water scrubbing is to wash the thir