阅读说明：本技术 一种石英精砂及其制备方法和应用 (Quartz fine sand and preparation method and application thereof ) 是由 郭鑫 田应忠 任朋 吴国亮 魏培贺 张建强 李莎莎 张志永 张乐 许可 姚杰 于 2021-08-27 设计创作，主要内容包括：本发明特别涉及一种石英精砂及其制备方法和应用,属于矿物加工技术领域,方法包括：预设分级粒度；将石英砂按分级粒度进行分类,获得粗石英砂和细石英砂；将粗石英砂进行色选,获得色选精矿和色选尾矿；将色选精矿进行第一磨矿、第一磁选和第一浮选,获得粗粒级石英精砂；将细石英砂和色选尾矿进行混合,获得混合矿；将混合矿进行第二磨矿、第二磁选和第二浮选,获得细粒级石英精砂；采用“破碎+分级+色选+磁选+浮选”的选矿工艺进行石英矿的提纯。通过对石英矿进行分级处理,得到不同粒度的产品满足不同领域的需求。粗粒级石英精砂满足光伏玻璃、军工技术、耐火材料等领域；细粒级石英精砂应用于硅微粉制造、化学化工、冶金和食品等领域。(The invention particularly relates to quartz fine sand and a preparation method and application thereof, belonging to the technical field of mineral processing, and the method comprises the following steps: presetting classification granularity; classifying the quartz sand according to the grading granularity to obtain coarse quartz sand and fine quartz sand; carrying out color separation on the coarse quartz sand to obtain color separation concentrate and color separation tailings; carrying out first ore grinding, first magnetic separation and first flotation on the color separation concentrate to obtain coarse fraction quartz concentrate; mixing the fine quartz sand and the color separation tailings to obtain mixed ore; performing second ore grinding, second magnetic separation and second flotation on the mixed ore to obtain fine-grained quartz concentrate; the quartz ore is purified by adopting the ore dressing process of crushing, grading, color separation, magnetic separation and flotation. The quartz ores are subjected to grading treatment to obtain products with different particle sizes, so that the requirements of different fields are met. The coarse-grained quartz fine sand meets the requirements of the fields of photovoltaic glass, military technology, refractory materials and the like; the fine-grained quartz refined sand is applied to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy, food and the like.)

1. A method of producing a quartz concentrate, the method comprising:

presetting classification granularity;

classifying the quartz sand according to the grading granularity to obtain coarse quartz sand and fine quartz sand;

carrying out color separation on the coarse quartz sand to obtain color separation concentrate and color separation tailings;

carrying out first ore grinding, first magnetic separation and first flotation on the color separation concentrate to obtain coarse fraction quartz concentrate;

mixing the fine quartz sand and the color separation tailings to obtain mixed ore;

and carrying out second ore grinding, second magnetic separation and second flotation on the mixed ore to obtain fine-grained quartz concentrate.

2. The method for preparing quartz concentrate according to claim 1, wherein the first flotation is a direct flotation process;

the pH value of the ore pulp of the first flotation is 5.0-11.0;

the collecting agent for the first flotation comprises at least one of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyloxy polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount of the collecting agent for the first flotation is 20-600g/t pulp;

the inhibitor for the first flotation comprises at least one of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzene sulfonate and hydrolyzed polymaleic anhydride, and the dosage of the inhibitor for the first flotation is 100-3000g/t pulp.

3. The method for preparing quartz concentrate according to claim 1, wherein the second flotation is a direct flotation process;

the pH value of the ore pulp of the second flotation is 5.0-11.0;

the collecting agent for the second flotation comprises at least one of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyloxy polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount of the collecting agent for the second flotation is 20-600g/t pulp;

the inhibitor for the second flotation comprises at least one of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzene sulfonate and hydrolyzed polymaleic anhydride, and the dosage of the inhibitor for the second flotation is 100-3000g/t pulp.

4. The method of preparing quartz concentrate according to claim 1, wherein the classified particle size is 0.13mm to 0.17 mm.

5. A method for producing quartz concentrate according to claim 1, characterized in that the first grinding is aimed at a content of 100% by weight of the colour concentrate grain size < 1 mm.

6. The method of claim 1, wherein the magnetic field strength of the first magnetic separation is 0.1T to 2.3T.

7. A method of producing quartz concentrate according to claim 1, characterized in that the second grinding is aimed at a content of 20-95% by weight of the mixed ore having a grain size < 0.106 mm.

8. The method of claim 1, wherein the magnetic field strength of the second magnetic separation is 0.1T to 2.3T.

9. A quartz concentrate, comprising a coarse-fraction quartz concentrate and a fine-fraction quartz concentrate, which are produced by the method for producing a quartz concentrate according to any one of claims 1 to 8.

10. Use of a quartz concentrate, characterized in that the quartz concentrate comprises a coarse-fraction quartz concentrate and a fine-fraction quartz concentrate, which are produced by the method for producing a quartz concentrate according to any one of claims 1 to 8; the application comprises the step of using the coarse-grained quartz concentrate in the fields of photovoltaic glass, military technology or refractory materials; the application comprises the step of applying the fine-grained quartz concentrate to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy or food.

Technical Field

The invention belongs to the technical field of mineral processing, and particularly relates to quartz refined sand and a preparation method and application thereof.

Background

With the development of industry, quartz has been widely used in industrial production. The quartz has excellent physicochemical properties such as high temperature resistance, corrosion resistance, low thermal expansion, high insulating property, light transmittance and the like, is widely applied to high and new technology industries such as photovoltaics, electronic information, optical communication, electric light sources and the like, and has important position and function in strategic emerging industries.

At present, the quality requirements of the quartz in the industry are continuously increased, and particularly, the requirements on the whiteness, the purity, the iron content and other impurity contents are increasingly increased. The gradual exhaustion of natural crystal resources promotes the rapid development of the preparation technology of high-purity quartz taking quartzite, silica and vein quartz as raw materials, most of quartz ores which can be developed and utilized at present have low purity and contain a large amount of impurities, such as Al and Fe₂O₃The presence of Mn, Cu is extremely largeReducing the whiteness and purity of the quartz ore, thereby reducing the commercial utilization value of the quartz ore. High purity quartz has become an irreplaceable key raw material in high technology.

Quartz purification processes are mainly divided into two types at home and abroad, one type adopts a chemical leaching method, and has the defects of high environmental protection risk and complex process flow; the second method is a flotation method, which mainly comprises the steps of removing pyrite in the quartz by reverse flotation and removing iron minerals in the ore by reverse flotation, wherein the iron minerals in the quartz ore have low content and large difference of laying types, so that the reverse flotation adaptability is poor and the flotation effect is poor.

The related patents are as follows: the Chinese patent application CN111268684A discloses a screening and purifying process of high-purity fused quartz, which comprises the following steps: 1) crushing; 2) washing with water; 3) magnetic separation; 4) roasting; 5) ultrasonic treatment; 6) and (4) acid leaching. The technology adopts roasting and acid leaching processes, so that the energy consumption is high, the pollution is large, and the subsequent environmental protection treatment cost is high; the Chinese patent application CN111153409A discloses a method for purifying quartz sand by removing iron through microwave heating and ultrasonic-assisted acid leaching, which utilizes microwave heating to heat an impurity-containing phase in quartz at the temperature of 400-1000 ℃ so as to promote the phase change and cracking of the impurity-containing (Fe) phase and an adjacent quartz substrate, and then adopts the ultrasonic-assisted acid leaching method to remove iron. The microwave heating energy consumption in the process is high, the pollution of the acid leaching process is great, and the subsequent environmental protection treatment cost is high; the Chinese patent application CN108928824A discloses a preparation process of high-purity quartz sand, which needs to use a large amount of hydrochloric acid and hydrofluoric acid, wherein the hydrofluoric acid belongs to dangerous chemicals, and is easy to generate danger or toxic and harmful byproducts in the production process. The invention of Chinese patent application CN109081352A relates to an ultra-pure quartz sand and its purification process, the whole process requires high temperature heating at 40-1000 deg.C, and uses a large amount of acid liquor, which results in high energy consumption and high cost. The invention discloses a low-grade quartz sand purification process in China's patent application CN109046746A, which adopts reverse flotation to respectively treat coarse and fine particle fractions, adopts a conventional collector of sulfide ore, has poor effect of collecting oxidized minerals in the ore, and does not reflect the content of impurity minerals in the patent and the embodiment. The invention of the Chinese patent application CN109127110A pyrite type quartz sand flotation purification process uses a medicament for flotation removal of pyrite, has poor separation effect on other types of quartz sand and has large medicament dosage. The invention of China patent application CN107662922A discloses a purification method of quartz sand, which comprises the steps of crushing, grading, scrubbing, washing with water to remove mud, floating, acid washing, leaching and drying to obtain high-purity quartz sand with the purity of more than 99.9%. The process flow is complex, and the acid washing process has great influence on the environment. The purification process of the quartz sand disclosed in the Chinese patent application CN107128936A has the disadvantages of complex process flow, complex cleaning liquid and acid liquid components used in the process, large medicament dosage and environmental pollution.

Disclosure of Invention

The application aims to provide quartz fine sand and a preparation method and application thereof, and aims to solve the problems of high energy consumption, high pollution, complex process flow, high production cost, difficulty in maintaining equipment and the like in the conventional quartz ore purification process.

The embodiment of the invention provides a preparation method of quartz fine sand, which comprises the following steps:

presetting classification granularity;

classifying the quartz sand according to the grading granularity to obtain coarse quartz sand and fine quartz sand;

carrying out color separation on the coarse quartz sand to obtain color separation concentrate and color separation tailings;

carrying out first ore grinding, first magnetic separation and first flotation on the color separation concentrate to obtain coarse fraction quartz concentrate;

mixing the fine quartz sand and the color separation tailings to obtain mixed ore;

and carrying out second ore grinding, second magnetic separation and second flotation on the mixed ore to obtain fine-grained quartz concentrate.

Optionally, the first flotation adopts a direct flotation process;

the pH value of the ore pulp of the first flotation is 5.0-11.0;

the collecting agent for the first flotation comprises at least one of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyloxy polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount of the collecting agent for the first flotation is 20-600g/t pulp;

the inhibitor for the first flotation comprises at least one of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzene sulfonate and hydrolyzed polymaleic anhydride, and the dosage of the inhibitor for the first flotation is 100-3000g/t pulp.

Optionally, the second flotation adopts a direct flotation process;

the pH value of the ore pulp of the second flotation is 5.0-11.0;

the collecting agent for the second flotation comprises at least one of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyloxy polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount of the collecting agent for the second flotation is 20-600g/t pulp;

the inhibitor for the second flotation comprises at least one of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzene sulfonate and hydrolyzed polymaleic anhydride, and the dosage of the inhibitor for the second flotation is 100-3000g/t pulp.

Optionally, the classification particle size is 0.13mm-0.17 mm.

Optionally, the first ore grinding aims at 100% of the color concentrate with the granularity of less than 1 mm.

Optionally, the magnetic field strength of the first magnetic separation is 0.1T-2.3T.

Optionally, the second grinding is performed with a target that the mixed ore has a weight content of 20% -95% and a grain size of less than 0.106 mm.

Optionally, the magnetic field strength of the second magnetic separation is 0.1T-2.3T.

Based on the same inventive concept, the embodiment of the invention also provides quartz refined sand, which comprises coarse-fraction quartz refined sand and fine-fraction quartz refined sand, wherein the coarse-fraction quartz refined sand and the fine-fraction quartz refined sand are prepared by the preparation method of the quartz refined sand.

Based on the same inventive concept, the embodiment of the invention also provides an application of the quartz refined sand, wherein the quartz refined sand comprises coarse-fraction quartz refined sand and fine-fraction quartz refined sand, and the coarse-fraction quartz refined sand and the fine-fraction quartz refined sand are prepared by adopting the preparation method of the quartz refined sand; the application comprises the step of using the coarse-grained quartz concentrate in the fields of photovoltaic glass, military technology or refractory materials; the application comprises the step of applying the fine-grained quartz concentrate to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy or food.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

the preparation method of the quartz concentrate provided by the embodiment of the invention comprises the following steps: presetting classification granularity; classifying the quartz sand according to the grading granularity to obtain coarse quartz sand and fine quartz sand; carrying out color separation on the coarse quartz sand to obtain color separation concentrate and color separation tailings; carrying out first ore grinding, first magnetic separation and first flotation on the color separation concentrate to obtain coarse fraction quartz concentrate; mixing the fine quartz sand and the color separation tailings to obtain mixed ore; performing second ore grinding, second magnetic separation and second flotation on the mixed ore to obtain fine-grained quartz concentrate; the quartz ore is purified by adopting the ore dressing process of crushing, grading, color separation, magnetic separation and flotation. The quartz ores are subjected to grading treatment to obtain products with different particle sizes so as to meet the requirements of different fields. The coarse-grained quartz fine sand can meet the requirements of the fields of photovoltaic glass, military technology, refractory materials and the like; the fine-grained quartz refined sand can be applied to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy, food and the like.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;

fig. 2 is a mineral processing process diagram provided by the embodiment of the invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

according to an exemplary embodiment of the present invention, there is provided a method of preparing quartz concentrate, the method including:

s1, presetting classification granularity;

as an alternative embodiment, the classifying particle size is 0.13mm to 0.17 mm. Preferably 0.15 mm.

S2, classifying the quartz sand according to the grading granularity to obtain coarse quartz sand and fine quartz sand;

specifically, quartz ore is crushed, generally, the granularity of the crushed ore material is 1mm-3mm, and then grading is carried out, wherein the grading specifically comprises classifying the ore material with the granularity larger than the separation granularity into coarse quartz sand and classifying the ore material with the granularity smaller than the separation granularity into fine quartz sand.

S3, performing color separation on the coarse quartz sand to obtain color separation concentrate and color separation tailings;

s4, performing first ore grinding, first magnetic separation and first flotation on the color separation concentrate to obtain coarse fraction quartz concentrate;

as an alternative mode, the color concentrate is ground, and the content of the ground ore with the granularity of less than 1mm is 100 percent. The ore grinding equipment is a ball mill, a rod mill and a ceramic lining type ball mill.

The reason for controlling the content of the ore grinding granularity less than 1mm to be 100 percent is to better realize the monomer dissociation of minerals and grind the ores as finely as possible, while the general granularity of the quartz concentrate is less than 1mm and has the content of 99.8 percent, and simultaneously, the requirements of the use granularity of the quartz concentrate and the monomer dissociation degree are considered, and the ores are ground until the content of the granularity less than 1mm is 100 percent.

As an optional implementation manner, the ground ore product is subjected to a magnetic separation process to obtain non-magnetic coarse fraction magnetic concentrate and magnetic coarse fraction magnetic tailings, the magnetic separator is one or a combination of a wet permanent magnetic separator and a high gradient magnetic separator, and the magnetic field strength is 0.1-2.3T.

As an optional implementation manner, the coarse fraction magnetic concentrate is treated by a flotation process, and a direct flotation process is adopted to obtain coarse quartz concentrate as flotation foam and coarse fraction flotation tailings as flotation underflow. The pH value of the flotation pulp is 5-11, and the pH regulator is one or the combination of sodium hydroxide, sodium carbonate, sulfuric acid and phosphoric acid; the concentration of the ore pulp is 30-65%; the collecting agent is one or more of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyl polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount is 20-600 g/t; the inhibitor is one or a combination of more of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzenesulfonate and hydrolyzed polymaleic anhydride, and the dosage is 100-3000 g/t.

S5, mixing the fine quartz sand and the color separation tailings to obtain mixed ore;

and S6, carrying out second ore grinding, second magnetic separation and second flotation on the mixed ore to obtain fine-grained quartz refined sand.

As an alternative embodiment, the mixed ore is ground, the grinding fineness (-0.106mm size fraction) is 20% -95%, and the grinding equipment is a ball mill, a rod mill or a ceramic lining type ball mill.

The reason for controlling the grinding fineness (-0.106mm size fraction) to be 20% -95% is to realize the monomer dissociation of the quartz minerals and meet the use requirements of subsequent products, the adverse effect of excessively small content value is that the product granularity is excessively fine, the application range of the subsequent products is narrow, the subsequent products are not suitable for large-scale production, the excessive adverse effect is that the product granularity is excessively large, the monomer dissociation of the minerals is not favorably realized, and the separation of the quartz and the impurity minerals is difficult to realize in the mineral separation process.

As an optional implementation mode, the mixed ore is treated by a magnetic separation process, and the nonmagnetic minerals are fine-fraction magnetic separation concentrates. The magnetic separator is one or combination of a wet high-gradient magnetic separator and a permanent magnetic separator, and the magnetic field intensity is 0.1-2.3T.

As an optional implementation manner, the fine-fraction magnetic concentrate is processed by a flotation process, flotation foam is fine-fraction quartz concentrate, and flotation underflow is flotation tailings. The pH value of the flotation pulp is 5-11, and the pH regulator is one or the combination of sodium hydroxide, sodium carbonate, sulfuric acid and phosphoric acid; the concentration of the ore pulp is 20 to 40 percent; the collecting agent is one or more of N-hexadecyl-1, 3-propane diamine, dodecylamine, hexadecyl polyvinyl alcohol, N-alkyl propane diamine and tallow propylene diamine, and the using amount is 20-600 g/t; the inhibitor is one or a combination of more of modified phosphate starch, modified corn starch, sodium naphthol azo-p-benzenesulfonate and hydrolyzed polymaleic anhydride, and the dosage is 100-3000 g/t.

According to another exemplary embodiment of the present invention, there is provided a quartz concentrate including a coarse-fraction quartz concentrate and a fine-fraction quartz concentrate, which are manufactured using the method for manufacturing a quartz concentrate provided above.

According to another exemplary embodiment of the present invention, there is provided a use of quartz concentrates including coarse-fraction quartz concentrates and fine-fraction quartz concentrates, which are produced using the method for producing quartz concentrates provided above; the application comprises the step of using the coarse-grained quartz concentrate in the fields of photovoltaic glass, military technology or refractory materials; the application comprises the step of applying the fine-grained quartz concentrate to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy or food.

The quartz concentrates of the present application, and the methods of preparation and use thereof will be described in detail below with reference to examples, comparative examples and experimental data.

Example 1

A quartz ore, wherein, SiO₂97.71% of Al₂O₃The content of 0.16%, the content of Cu 20ppm, the content of Mn 12ppm, and the content of Fe 1.49%, and the quality improvement and impurity removal test was performed according to the flow shown in FIG. 2.

The method comprises the following specific steps: crushing and grading raw ores, and performing color separation on the raw ores with the diameter of 0.15mm to obtain color separation concentrates and color separation tailings; and grinding, magnetic separation and flotation are carried out on the color separation concentrate to obtain coarse fraction quartz concentrate. Wherein, the ore grinding adopts a ceramic lining ball mill, the content of the ore grinding granularity of-1 mm is 100%, the magnetic separation is combined use of a permanent magnetic machine and a high gradient magnetic separator, the magnetic field intensity is respectively 0.2T and 1.0T, the flotation adopts a flow of primary coarse-tertiary fine-one sweeping, the pH of ore pulp is 9, the flotation concentration is 50%, and the collecting agent is N-hexadecyl-1, 3-propane diamine: 1:2 of laurylamine, and the dosage is 150 g/t; the inhibitor is modified corn starch, and the dosage is 800 g/t. The color separation tailings and the products with the grading size of-0.15 mm are uniformly mixed, and fine-grained quartz refined sand is obtained through ore grinding, magnetic separation and flotation. Wherein, the content of grinding fineness-0.106 mm is 85%, the grinding adopts a ceramic lining ball mill, the magnetic separation adopts a high gradient magnetic separator, the magnetic field intensity is 1.5T, the flotation adopts a coarse-fine-one-scanning process, the pH of ore pulp is 9, the flotation concentration is 30%, and the collecting agent is N-hexadecyl-1, 3-propane diamine: and the dosage of the laurylamine is 1:2, and is 200 g/t. The inhibitor is hydrolyzed polymaleic anhydride, and the dosage is 300 g/t.

Example 1

A quartz ore, wherein, SiO₂98.85% of Al₂O₃The content was 0.32%, the Cu content was 32ppm, the Mn content was 41ppm, and the Fe content was 0.88%, as shown in FIG. 2The process of (2) is used for carrying out quality improvement and impurity removal tests.

The method comprises the following specific steps: crushing and grading raw ores, and performing color separation on the raw ores with the diameter of 0.15mm to obtain color separation concentrates and color separation tailings; and grinding, magnetic separation and flotation are carried out on the color separation concentrate to obtain coarse fraction quartz concentrate. Wherein, the grinding adopts a rod mill, the content of the grinding granularity of-1 mm is 100%, the magnetic separation is combined use of a permanent magnet machine and a high gradient magnetic separator, the magnetic field intensity is 0.3T and 1.7T respectively, the flotation adopts a primary coarse-tertiary fine-one-sweep process, the pH of the ore pulp is 10, the flotation concentration is 60%, the use amount of a collector tallow propylene diamine is 200g/T, the use amount of an inhibitor is modified phosphate starch and is 1000 g/T; the color separation tailings and the products with the grading size of-0.15 mm are uniformly mixed, and fine-grained quartz refined sand is obtained through ore grinding, magnetic separation and flotation. Wherein, the grinding adopts a rod mill, the content of grinding fineness of-0.106 mm is 80%, the magnetic separation adopts a high-gradient magnetic separator, the magnetic field intensity is 2.0T, the flotation adopts a flow of coarse-fine-one-scan, the pH of ore pulp is 10, the collecting agent is laurylamine which is 1:2, and the dosage is 300 g/T. The inhibitor is modified phosphate starch, and the dosage is 500 g/t.

Comparative example 1

Mixing SiO₂97.71% of Al₂O₃The quartz sand with the content of 0.16 percent, the content of Cu of 20ppm, the content of Mn of 12ppm and the content of Fe of 1.49 percent is purified by adopting a CN109046746A process flow and a medicament.

Comparative example 2

Mixing SiO₂97.71% of Al₂O₃The quartz sand with the content of 0.16 percent, the content of Cu of 20ppm, the content of Mn of 12ppm and the content of Fe of 1.49 percent is purified by adopting a CN107128936A process flow and a medicament.

Comparative example 3

Mixing SiO₂98.85% of Al₂O₃The quartz sand with the content of 0.32 percent, the content of Cu of 32ppm, the content of Mn of 41ppm and the content of Fe of 0.88 percent is subjected to quality improvement and impurity removal tests according to the flow shown in FIG. 2.

The method comprises the following specific steps: crushing and grading raw ores, and performing color separation on the raw ores with the diameter of 0.15mm to obtain color separation concentrates and color separation tailings; and grinding, magnetic separation and flotation are carried out on the color separation concentrate to obtain coarse fraction quartz concentrate. Wherein, the ore grinding adopts a ceramic lining ball mill, the content of the ore grinding granularity of-1 mm is 100%, the magnetic separation is combined use of a permanent magnetic machine and a high gradient magnetic separator, the magnetic field intensity is respectively 0.2T and 1.0T, the flotation adopts a primary coarse-tertiary fine-one-scanning process, the pH of ore pulp is 9, the flotation concentration is 50%, and the dosage of dodecyl trimethyl ammonium chloride is 300 g/T; the inhibitor is sodium hexametaphosphate with the dosage of 60 g/t. The color separation tailings and the products with the grading size of-0.15 mm are uniformly mixed, and fine-grained quartz refined sand is obtained through ore grinding, magnetic separation and flotation. Wherein the content of ground ore fineness-0.106 mm is 85%, the ground ore adopts a ceramic lining ball mill, the magnetic separation adopts a high gradient magnetic separator, the magnetic field intensity is 1.5T, the flotation adopts a primary coarse-secondary fine-one-scanning process, the pH of ore pulp is 9, the flotation concentration is 30%, the collecting agent is dodecyl trimethyl ammonium chloride, and the using amount is 200 g/T. The inhibitor is water glass, and the dosage is 3500 g/t.

Examples of the experiments

The results of the tests on the coarse fraction quartz concentrate and the fine fraction quartz concentrate obtained in examples 1 to 2 and comparative examples 1 to 3 are shown in the following tables.

From the above table, the method is adopted to carry out grading treatment on the quartz ore, so as to obtain products with different particle sizes to meet the requirements of different fields. The coarse-grained quartz fine sand can meet the requirements of the fields of photovoltaic glass, military technology, refractory materials and the like; the fine-grained quartz refined sand can be applied to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy, food and the like.

As can be seen from comparison of data of comparative example 1, comparative example 2 and example 1, the effect of example 1 cannot be achieved by purifying quartz ore by using parameters in patents CN109046746A and CN107128936A, wherein the collector in patent CN109046746A mainly aims at sulfide ore, i.e. has a certain effect on sulfide ore such as sulfurous iron ore in ore, so the patent technology is not suitable for processing the ore sample in example 1; in patent CN107128936A, oxalic acid, formic acid and citric acid used in acid leaching are weak acids, which have a certain removal effect on iron minerals in quartz ore in example 1, but have an insignificant removal effect on aluminum minerals, copper minerals and manganese minerals. .

By comparing the data of the comparative example 3 and the data of the example 2, the situations that the content of silicon dioxide in the concentrate is reduced, the content of aluminum oxide is increased, the content of iron is increased, the content of copper is increased and the content of manganese is increased can occur when the types of the flotation collecting agent and the types and the using amount of the inhibitor are not in the range provided by the embodiment, so that the quartz concentrate can not meet the market demand of photovoltaic glass, namely high-end quartz industry.

One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:

(1) the method provided by the embodiment of the invention adopts a mineral processing technology of crushing, grading, color separation, magnetic separation and flotation to purify the quartz ore, and solves the problems of high energy consumption, large pollution, complex process flow, high production cost, difficulty in maintaining equipment and the like in the existing quartz ore purification technology;

(2) the method provided by the embodiment of the invention adopts the novel collecting agent, and has good collecting performance for quartz ores with different size fractions;

(3) the method provided by the embodiment of the invention is used for grading the quartz ores to obtain products with different particle sizes so as to meet the requirements of different fields. The coarse-grained quartz fine sand can meet the requirements of the fields of photovoltaic glass, military technology, refractory materials and the like; the fine-grained quartz refined sand can be applied to the fields of silicon micropowder manufacture, chemistry and chemical engineering, metallurgy, food and the like;

(4) the method provided by the embodiment of the invention has the advantages of small environmental pollution, low consumption of related medicaments, large raw ore treatment capacity, simple and stable process equipment and high application value.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.