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CN-121991299-A - Composite grinding aid for quartz grinding and preparation method thereof

CN121991299ACN 121991299 ACN121991299 ACN 121991299ACN-121991299-A

Abstract

The invention relates to the technical field of ore grinding, in particular to a composite grinding aid for quartz ore grinding and a preparation method thereof, the composite grinding aid provided by the invention takes vinylphosphonic acid as a core anchoring monomer, the phosphonic acid group in the molecular structure has specific extremely strong affinity to hard acid type metal impurities such as iron, titanium, aluminum and the like exposed in the microcracks of the quartz crystal; the methyl allyl alcohol polyoxyethylene ether is used as a steric hindrance monomer to further prevent quartz fine particles from approaching each other and re-agglomerating, so that the fluidity of ore pulp is remarkably improved, and the acryloyl morpholine is used as a polar adjustment monomer, the rigid morpholine ring structure in the molecule of the acryloyl morpholine greatly enhances the stability of a polymer main chain, avoids layering and precipitation phenomena of a grinding aid in the ore pulp, can adjust the viscosity of a system, avoids abnormal fluidity of the ore pulp caused by overlong polyether chains, and ensures the stability of grinding aid effect.

Inventors

  • ZHONG LELE
  • XIE QIHONG
  • LIU JIAHUI
  • CAO LING
  • LIU YULIN
  • MA MINGJIE
  • LU DUO

Assignees

  • 湖北省鸣石高纯材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (10)

  1. 1. The preparation method of the composite grinding aid for quartz grinding is characterized by comprising the following steps of adding vinyl phosphonic acid, methallyl alcohol polyoxyethylene ether and acryloylmorpholine into deionized water, stirring for dissolution, then adding an initiator and mercaptopropionic acid into the mixture, heating and stirring for reaction, cooling to room temperature after the reaction is finished, then adding a nitrilotriacetic acid solution, and stirring uniformly to obtain the composite grinding aid.
  2. 2. The preparation method of claim 1, wherein the weight ratio of the vinyl phosphonic acid, the methallyl alcohol polyoxyethylene ether, the acryloylmorpholine, the deionized water, the initiator, the mercaptopropionic acid and the nitrilotriacetic acid solution is 8-15:10-20:4-8:150:0.3-0.8:0.2-0.5:5-10.
  3. 3. The method of claim 1, wherein the initiator is selected from persulfates.
  4. 4. The preparation method according to claim 1, wherein the temperature of the heating and stirring reaction is 65-75 ℃, and the time of the heating and stirring reaction is 3-6 hours.
  5. 5. The preparation method according to claim 1, wherein the nitrilotriacetic acid solution has a mass fraction of 25-40%.
  6. 6. The composite grinding aid prepared by the preparation method according to any one of claims 1 to 5.
  7. 7. The use of the composite grinding aid of claim 6 in a quartz grinding system.
  8. 8. The use according to claim 7, characterized by the specific steps of: s1, crushing a quartz raw ore by a jaw crusher, and then calcining and water quenching to obtain a coarse ore A; S2, secondarily crushing the coarse ore A obtained in the step S1 by a double-roller crusher, and grading the granularity by using a vibration screening machine, wherein the oversize material is coarse ore B, and the undersize material is fine ore A; S3, returning the coarse ore B obtained in the step S2 to a double-roller crusher for cyclic crushing, and adding the composite grinding aid in the claim 6 into the fine ore A obtained in the step S2 for wet ball milling to obtain quartz mineral powder with target granularity.
  9. 9. The use according to claim 8, wherein in step S3, the compound grinding aid is added in an amount of 0.3-0.8% by mass of fine ore a.
  10. 10. The method according to claim 8, wherein in the step S3, the technological parameters of the wet ball milling are that the grinding concentration is 50-70%, the grinding time is 10-30min, and the grinding fineness is 0.212-0.075mm and the proportion is more than or equal to 60%.

Description

Composite grinding aid for quartz grinding and preparation method thereof Technical Field The invention relates to the technical field of grinding, in particular to a composite grinding aid for quartz grinding and a preparation method thereof. Background The high-purity quartz sand is taken as a novel inorganic nonmetallic material, is widely applied to the preparation of core materials such as semiconductors, chips, integrated circuits, optical fibers and the like, is one of the indispensable basic materials in the high-tech field, and has important roles in the fields such as national defense and military industry, aerospace, electronic information and the like. In the process for preparing the high-purity quartz sand, the beneficiation link is particularly critical, and the beneficiation is carried out on the premise that useful minerals and gangue minerals are fully dissociated in a monomer mode and are mainly finished through crushing and grinding. The grinding process is an operation with high energy consumption, and particularly when fine grinding and superfine grinding of materials are needed, the energy consumption is higher. The statistical result shows that the electric energy consumed by the grinding in the world is about 5% of the total annual energy generation, the grinding operation investment is about 60% of the investment of the whole concentrating mill, the electric energy consumption of the grinding operation is about 30% -70% of the total electric energy consumption of the concentrating mill, the production and operation cost is about 40% -50% of the total cost of the concentrating mill, and in the technical aspect, the quality of the grinding operation product directly influences the quality of the sorting index, and the production capacity of the grinding directly determines the production capacity of the whole quartz sand mill. The addition of small amounts of chemical additives (gaseous, liquid or solid chemicals) during the grinding process, commonly referred to as grinding aids, can significantly increase the grinding efficiency or reduce the energy and steel consumption of the grinding process. Researches show that the grinding aid can improve the grindability of materials, lighten the agglomeration among particles and improve the fluidity of the materials in a mill, or can reduce the surface hardness of minerals and accelerate the grinding speed of ore particles, thereby achieving the purposes of improving the grinding efficiency, reducing the energy consumption and the like, and the beneficial grinding aid can also play a role in inhibiting the grinding medium and the lining plate of the mill, thereby reducing the steel consumption. The quartz grinding is used as a key link for processing nonmetallic minerals, the core problem faced at present is that the performance of the grinding aid is insufficient, and the existing grinding aid (such as inorganic/organic medicaments of sodium tripolyphosphate, triethanolamine and the like) can reduce the surface energy of quartz particles to a certain extent, but has limited grinding aid effect lifting range, and is difficult to meet the industrial production requirement of high-purity superfine quartz powder. Therefore, development of an efficient, specific and highly-adaptive quartz grinding effective grinding aid is urgently needed at present. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide the compound grinding aid for quartz grinding and the preparation method thereof, and the compound grinding aid provided by the invention can effectively complex metal ions such as iron, magnesium, calcium and the like, reduce the content of metal impurities, and simultaneously improve the rheological property of ore pulp, thereby improving the overall efficiency of a grinding system. In order to achieve the above purpose, the present invention adopts the following technical scheme: The preparation method of the composite grinding aid for quartz grinding comprises the following steps of adding vinyl phosphonic acid, methallyl alcohol polyoxyethylene ether and acryloylmorpholine into deionized water, stirring for dissolution, then adding an initiator and mercaptopropionic acid into the mixture, heating and stirring for reaction, cooling to room temperature after the reaction is finished, then adding a nitrilotriacetic acid solution, and stirring uniformly to obtain the composite grinding aid. In the technical scheme disclosed by the invention, the weight ratio of the vinyl phosphonic acid to the methallyl alcohol polyoxyethylene ether to the acryloylmorpholine to the deionized water to the initiator to the mercaptopropionic acid to the nitrilotriacetic acid solution is 8-15:10-20:4-8:150:0.3-0.8:0.2-0.5:5-10. In the technical scheme disclosed by the invention, the initiator is selected from persulfates, such as ammonium persulfate, sodium persulfate or potassium persulfate. In the technical scheme disclosed