CN113894034B - Purification method of quartz sand raw material - Google Patents

Purification method of quartz sand raw material Download PDF

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CN113894034B
CN113894034B CN202111067321.XA CN202111067321A CN113894034B CN 113894034 B CN113894034 B CN 113894034B CN 202111067321 A CN202111067321 A CN 202111067321A CN 113894034 B CN113894034 B CN 113894034B
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quartz sand
granularity
separation
treatment
drum
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CN113894034A (en
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张建文
马崇振
廖乾
梁汉
张华�
曾尚林
张胜广
陶斯尧
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Changsha Research Institute of Mining and Metallurgy Co Ltd
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Changsha Research Institute of Mining and Metallurgy Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators
    • B03C7/06—Separators with cylindrical material carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Silicon Compounds (AREA)

Abstract

The invention provides a method for purifying a quartz sand raw material, which comprises the following steps: (1) screening: sieving to obtain quartz sand with granularity below 0.83mm and water content below 3%; (2) magnetic separation: conveying the quartz sand to a double-drum magnetic separator to perform magnetic separation rough separation treatment and magnetic separation fine separation treatment in sequence; (3) and (3) drying: controlling the discharge temperature of the dried quartz sand to be between 70 and 120 ℃; (4) electric selection: and (4) electrically selecting the quartz sand, and controlling the selection voltage and the cylinder rotating speed to obtain the high-purity quartz sand. The purification process has the advantages of simple flow, environmental protection, no pollution, low production cost, excellent product quality, high production efficiency, high recovery rate and the like, and can be suitable for purification treatment of quartz ore with high ferric oxide content, and the purified quartz sand can reach the quality standard of high-purity quartz sand.

Description

Purification method of quartz sand raw material
Technical Field
The invention belongs to the technical field of quartz sand production, and particularly relates to a method for purifying a quartz sand raw material.
Background
Quartz sand is a silicate mineral with stable physical and chemical properties, and has the characteristics of hardness, wear resistance and the likeChemical formula is SiO 2 . Quartz sand is an important non-metallic mineral raw material, is not only widely used in the industries of producing coatings, glass, cast steel, cast iron, corrosion prevention, filtration, ceramics and refractory materials, construction, metallurgy, chemical engineering, plastics, rubber and the like, but also plays an irreplaceable role in high and new technology industries such as aerospace, bioengineering, solar cells, electronic technology, optical fiber communication, military industry and the like. The high-purity quartz sand used in the high and new technical field has strict quality requirements on the content of metal impurities such as iron, aluminum and the like in the high-purity quartz sand besides the content of silicon dioxide reaching the standard requirement.
China researches high-purity quartz sand later, beginning in the end of the last 90 th century, and lags behind foreign technologies. The prior quartz sand purification method mainly comprises the processes of acid leaching, flotation, microbial leaching, magnetic separation and the like. The acid leaching has the disadvantages of complex process, high cost and serious environmental pollution; the flotation method utilizes floatability difference of impurities and quartz sand to remove impurity ores, but the flotation method also has a serious problem of environmental pollution; the microbial leaching process has the defects of long production period, low treatment capacity, low iron removal efficiency and the like. The magnetic separation method can remove magnetic impurities such as hematite, ilmenite and the like, but has poor separation effect on the impurities with weak magnetism, and has low lower limits of separation precision and separation granularity. Such as the existing commonly used method for purifying quartz sand, such as the quartz sand purification process disclosed in CN201310587864.3, the process adopts the methods of ball milling, desliming, flotation, acid leaching and magnetic separation to obtain SiO 2 ≥99.8％，Fe 2 O 3 ≤0.023％，Al 2 O 3 ≤0.05％，TiO 2 High-quality refined quartz less than or equal to 0.02 percent. The content of the ferric oxide in the raw quartz sand ore treated by the method is only 0.02-0.06%, and the method can only treat quartz sand with low ferric oxide content and cannot play a role in quartz ore with high ferric oxide content.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art and provide a method for purifying quartz sand raw materials.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for purifying quartz sand raw materials comprises the following steps:
(1) screening: conveying the quartz sand raw material to a vibrating screen for screening treatment, wherein the granularity of the quartz sand obtained after screening treatment is below 0.83mm, and the water content of the quartz sand is controlled below 3%;
(2) magnetic separation: conveying the quartz sand obtained after the treatment in the step (1) to a double-drum magnetic separator for magnetic separation roughing treatment and magnetic separation concentrating treatment in sequence to remove magnetic impurities;
(3) and (3) drying: conveying the quartz sand obtained after the treatment in the step (2) to drying equipment for drying treatment, wherein the discharge temperature of the quartz sand after the drying treatment is controlled to be 70-120 ℃;
(4) electric selection: and (4) conveying the quartz sand obtained after the treatment in the step (3) to an electric separator for electric separation, and controlling the separation voltage and the cylinder rotating speed to obtain the high-purity quartz sand.
When the invention is used for purifying the quartz sand raw material, the screening granularity is strictly controlled during screening in order to ensure the narrow-grade screening requirement of the quartz sand material during electric separation. And conveying the screened quartz sand material to a double-drum magnetic separator for primary and secondary magnetic separation treatment to effectively remove ferromagnetic impurities, and then drying to remove moisture and humidity in the quartz sand material and reduce the inherent conductivity difference among the materials. After the drying post-treatment, the discharge temperature of the quartz sand is controlled to be 70-120 ℃, when the quartz sand enters an electric separation machine for electric separation, the higher the temperature of the material is in a certain temperature range, the better the electric separation effect is, but the overhigh temperature increases the energy consumption in the electric separation process, so that the discharge temperature of the quartz sand is controlled to be 70-120 ℃.
If according to traditional handicraft, carry out the drying earlier and carry out magnetic separation and electric selection in proper order again, the quartz sand of dry back high temperature can destroy the magnet separator magnetism and be the structure, produces the demagnetization problem to lead to the magnetic separation effect to descend, the quartz sand temperature reduces to the lower temperature after the magnetic separation simultaneously, compares with the quartz sand of high temperature, and the electric selection is selected separately the effect and also can obviously descend, needs the quartz sand material temperature of reheating to the suitable temperature that the electric selection selected separately the material, has increased the energy consumption like this again. According to the purification method of the quartz sand raw material, the processes of vibrating screen screening, double-drum magnetic separator magnetic separation, drying and electric separator electric separation are adopted, the whole process flow is simple, the environment is not polluted, the whole production efficiency is high, the process production cycle is short, the processing capacity is high, the cost is low, and the purification method is suitable for industrial production.
Preferably, in the step (1), quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm are selected after screening treatment.
Preferably, the step (1) specifically comprises the following steps: firstly, conveying quartz sand raw materials to a vibrating screen for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen for three-stage screening treatment to obtain quartz sand with the granularity of 0.045-0.15 mm and quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
The invention not only reasonably controls the granularity of the raw materials, but also classifies the feeding granularity, thereby ensuring the production quantity of the product, ensuring that the granularity of the coarse quartz sand concentrate conforms to the feeding granularity range of the drum magnetic separator and the electric separator, and respectively selecting narrow granularity fractions is beneficial to improving the processing capacity and the separation effect of the drum magnetic separator and the six-roller electric separator and improving the quality of the quartz sand concentrate product.
Preferably, the step (2) specifically comprises the following steps: respectively conveying quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm to a double-drum magnetic separator for magnetic separation roughing treatment and magnetic separation concentrating treatment in sequence; the magnetic separation roughing treatment is carried out on an upper cylinder in a double-cylinder magnetic separator, and the magnetic separation fine separation treatment is carried out on a lower cylinder in the double-cylinder magnetic separator; the double-drum magnetic separator is a dry double-drum magnetic separator;
when the granularity of the quartz sand is between 0.15 and 0.83mm, the magnetic field intensity of the upper drum is 0.08 to 0.30T, and the rotating speed of the roller is 40 to 60 r/min; the magnetic field intensity of the lower drum is 0.5-0.8T, and the rotating speed of the roller is 50-70 r/min;
when the granularity of the quartz sand is between 0.045 and 0.15mm, the magnetic field intensity of the upper drum is 0.12 to 0.30T, and the rotating speed of the drum is 60 to 80 r/min; the magnetic field intensity of the lower drum is 0.6-0.8T, and the rotating speed of the drum is 70-90 r/min.
During magnetic separation, the magnetic field intensity of the upper cylinder and the lower cylinder of the quartz sand with different granularity levels and the rotating speed of the roller in the double-cylinder magnetic separator are reasonably set, so that the magnetic impurities in quartz sand materials can be effectively removed, and the overall efficiency and the separation index are obviously improved.
Preferably, in the step (4), the electric separator is a six-roller electric separator, quartz sand obtained by upper-layer separation and separation of the six-roller electric separator is guided into a middle-layer separation and separation region during electric separation and separation, quartz sand obtained by middle-layer separation and separation is guided into a lower-layer separation and separation region for separation, the rotating speeds of cylinders of the upper, middle and lower separation regions are sequentially reduced, and the separation voltages of the upper, middle and lower separation regions are the same. The step is equivalent to that the quartz sand raw material is subjected to once roughing and twice fine concentration in a cylinder electric separator. The six-roller type electric separator can be a high-efficiency energy-saving high-voltage electric separator in a patent ZL201410115681.6, and the electric separator is configured with two rows of six rollers, so that the processing capacity of quartz sand purification is improved. The cylinder corresponds to a cylinder electrode in a high-efficiency energy-saving high-voltage electric separator and is equivalent to a roller in a common electric separator.
Preferably, in the step (4), when the granularity of the quartz sand is 0.15-0.83 mm, the sorting voltage is 25 kV-40 kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 60-160 r/min, 50-140 r/min and 40-120 r/min respectively;
when the granularity of the quartz sand is between 0.045 and 0.15mm, the sorting voltage is between 20kV and 36kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are respectively 60 to 200r/min, 50 to 190r/min and 40 to 180 r/min.
The invention selects the specific six-roller electric separator to perform electric separation, thereby effectively ensuring the production efficiency and quality. The technical indexes of the obtained quartz sand concentrate meet the quality standard of high-purity quartz sand by controlling the separation voltage and the cylinder rotating speed.
In addition, a cleaning electrode device (an electrode structure automatic timing air blowing cleaning device) can be arranged in the six-roller electric separator, so that the electrode structure and a high-voltage porcelain insulator are prevented from being covered by dust, the separation voltage is reduced, and the electrostatic separation efficiency is improved. The negative charges on the flocculent and fibrous nonconductor agglomerated particles can be neutralized, so that the nonconductor particles are dispersed in a neutral or positive charge state, and the dispersed materials fall into a nonconductor receiving hopper under the action of gravity, thereby realizing the purposes of cleaning the materials adhered on the sorting cylinder and solving the problem of material agglomeration.
Preferably, in the step (1), the granularity of the quartz sand raw material is less than 4mm, the quartz sand is quartz sand rough concentrate, and SiO in the quartz sand 2 The content is 90-98%, and the content of ferric oxide in the quartz sand is 0.02-0.50%. The purification method of the quartz sand raw material can be suitable for quartz ores with high ferric oxide content, and has wide applicable content range.
Preferably, in the step (3), the drying temperature of the quartz sand is 250-300 ℃, and the drying time is 20-30 min.
Preferably, in the step (3), the water content of the dried quartz sand is less than 0.5%. The water content is controlled to be less than 0.5%, so that the inherent conductivity difference among the quartz sand materials is good.
Compared with the prior art, the invention has the beneficial effects that:
the invention firstly adopts a pre-screening process to remove the impurities of coarse particles and the coarse quartz sand in the quartz sand, thereby ensuring the narrow-grade separation requirement of the electrically selected materials, namely the more uniform the granularity, the better the effect. And conveying the screened quartz sand material to a double-drum magnetic separator for primary and secondary coarse and fine magnetic separation treatment to remove ferromagnetic impurities. Conveying the non-magnetic quartz sand subjected to magnetic separation to a drying deviceThe drying treatment can effectively remove the moisture and humidity in the quartz sand material, reduce the inherent conductivity difference among the materials, fully loosen the quartz sand material and improve the fluidity. And conveying the dried quartz sand raw material to an electric separator for electric separation and fine selection, controlling separation voltage and cylinder rotating speed, and removing conductive impurities in the non-conductive quartz sand to obtain the high-purity quartz sand. The purification process has the advantages of simple flow, environmental protection, no pollution, low production cost, excellent product quality, high production efficiency, high recovery rate and the like, and can be suitable for purification treatment of quartz ore with high ferric oxide content, and SiO in the purified quartz sand 2 The content is more than or equal to 99.9 percent, the ferric oxide content is less than or equal to 25ppm, and the quality standard of the high-purity quartz sand is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
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 the following examples and comparative examples, a six-roller type electric separator is an efficient energy-saving high-voltage electric separator in a patent ZL 201410115681.6.
Example 1:
a method for purifying quartz sand raw material, the process flow diagram of which is shown in figure 1, comprises the following steps:
(1) selecting materials: selecting SiO with granularity below 4mm 2 The content of common quartz sand (quartz sand rough concentrate) is about 95%, and the content of ferric oxide in the quartz sand is 0.02-0.50%.
(2) Screening: firstly, conveying a quartz sand raw material to a vibrating screen (the aperture of a screen hole is 0.83mm) for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen (the aperture of the screen hole is 0.15mm) for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; then conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen (the aperture of the screen hole is 0.045mm) for three-stage screening treatment to obtain the quartz sand with the granularity of 0.045-0.15 mm and the quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
(3) Magnetic separation: respectively conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained by the treatment in the step (2), into a dry double-drum magnetic separator to sequentially carry out magnetic separation roughing treatment and magnetic separation concentrating treatment so as to remove magnetic impurities;
the magnetic separation roughing treatment is carried out on an upper cylinder in the dry type double-cylinder magnetic separator, and the magnetic separation refining treatment is carried out on a lower cylinder in the dry type double-cylinder magnetic separator;
when the granularity of the quartz sand is between 0.15mm and 0.83mm, the magnetic field intensity of the upper drum is 0.12T, and the rotating speed of the drum is 50 r/min; the magnetic field intensity of the lower drum is 0.7T, and the rotating speed of the drum is 65 r/min;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the magnetic field intensity of the upper drum is 0.15T, and the rotating speed of the drum is 60 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 70 r/min.
(4) And (3) drying: conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained after the treatment in the step (3), to drying equipment for 20min at 280 ℃ to ensure that the water content of the quartz sand is less than 0.5 percent and the discharge temperature of the quartz sand materials with two granularity levels reaches 110 ℃.
(5) Electric selection: and (4) electrically selecting the quartz sand with two granularity levels processed in the step (4) by a six-roller electric selector, wherein during electric selection, the quartz sand obtained by upper-layer selection and separation of the six-roller electric selector is guided into a middle-layer selection and separation area for selection, and the quartz sand material obtained by middle-layer selection and separation is guided into a lower-layer selection and separation area for selection.
When the granularity of the quartz sand is between 0.15mm and 0.83mm, the sorting voltage is 36kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 120r/min, 110r/min and 100r/min respectively;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the sorting voltage is 32kV, and the rotating speeds of the cylinders in the upper layer sorting area, the middle layer sorting area and the lower layer sorting area are 160r/min, 140r/min and 120r/min respectively.
Finally, the SiO in the quartz sand with the granularity of 0.15-0.83 mm is purified by the embodiment 2 The content of SiO in the quartz sand is 99.93 percent, the content of ferric oxide is less than or equal to 23ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.92 percent, the content of ferric oxide is less than or equal to 25ppm, and the quality standards of the high-purity quartz sand are all reached.
Example 2:
a method for purifying quartz sand raw materials comprises the following steps:
(1) selecting materials: selecting SiO with granularity below 4mm 2 The content of the iron oxide in the common quartz sand (quartz sand rough concentrate) is 0.02-0.50%.
(2) Screening: firstly, conveying quartz sand raw materials to a vibrating screen (the aperture of a screen hole is 0.83mm) for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen (the aperture of the screen hole is 0.15mm) for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; then conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen (the aperture of the screen hole is 0.045mm) for three-stage screening treatment to obtain the quartz sand with the granularity of 0.045-0.15 mm and the quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
(3) Magnetic separation: respectively conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained by the treatment in the step (2), into a dry double-drum magnetic separator to sequentially carry out magnetic separation roughing treatment and magnetic separation concentrating treatment so as to remove magnetic impurities;
the magnetic separation roughing treatment is carried out on an upper cylinder in the dry type double-cylinder magnetic separator, and the magnetic separation refining treatment is carried out on a lower cylinder in the dry type double-cylinder magnetic separator;
when the granularity of the quartz sand is between 0.15mm and 0.83mm, the magnetic field intensity of the upper drum is 0.15T, and the rotating speed of the drum is 50 r/min; the magnetic field intensity of the lower drum is 0.7T, and the rotating speed of the drum is 70 r/min;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the magnetic field intensity of the upper drum is 0.15T, and the rotating speed of the drum is 70 r/min; the magnetic field intensity of the lower drum is 0.0.8T, and the rotating speed of the drum is 75 r/min.
(4) And (3) drying: and (4) conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained after the treatment in the step (3), to drying equipment for 30min at 270 ℃ until the water content of the quartz sand is less than 0.5% and the discharge temperature of the quartz sand materials with two granularity levels reaches 100 ℃.
(5) Electric separation: and (4) electrically selecting the quartz sand with two granularity levels processed in the step (4) by a six-roller electric selector, wherein during electric selection, the quartz sand obtained by upper-layer selection and separation of the six-roller electric selector is guided into a middle-layer selection and separation area for selection, and the quartz sand material obtained by middle-layer selection and separation is guided into a lower-layer selection and separation area for selection.
When the granularity of the quartz sand is between 0.15 and 0.83mm, the sorting voltage is 35kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 110r/min, 100r/min and 90r/min respectively;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the sorting voltage is 32kV, and the rotating speeds of the cylinders in the upper layer sorting area, the middle layer sorting area and the lower layer sorting area are 150r/min, 130r/min and 110r/min respectively.
SiO in quartz sand with granularity of 0.15-0.83 mm purified by the embodiment 2 The content of SiO in the quartz sand is 99.94 percent, the content of ferric oxide is less than or equal to 20ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.92 percent, the content of ferric oxide is less than or equal to 22ppm, and the quality standards of the high-purity quartz sand are all reached.
Example 3:
a method for purifying quartz sand raw materials comprises the following steps:
(1) selecting materials: selecting SiO with granularity below 4mm 2 The content of the iron oxide in the common quartz sand (quartz sand rough concentrate) is about 97 percent, and the content of the iron oxide in the quartz sand is 0.02 to 0.50 percent.
(2) Screening: firstly, conveying a quartz sand raw material to a vibrating screen (the aperture of a screen hole is 0.83mm) for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen (the aperture of the screen hole is 0.15mm) for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen (the aperture of the screen is 0.045mm) for three-stage screening treatment to obtain the quartz sand with the granularity of 0.045-0.15 mm and the quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
(3) Magnetic separation: respectively conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained by the treatment in the step (2), into a dry double-drum magnetic separator to sequentially carry out magnetic separation roughing treatment and magnetic separation concentrating treatment so as to remove magnetic impurities;
the magnetic separation roughing treatment is carried out on an upper cylinder in a dry double-cylinder magnetic separator, and the magnetic separation fine separation treatment is carried out on a lower cylinder in the dry double-cylinder magnetic separator;
when the granularity of the quartz sand is between 0.15mm and 0.83mm, the magnetic field intensity of the upper drum is 0.12T, and the rotating speed of the drum is 60 r/min; the magnetic field intensity of the lower drum is 0.7T, and the rotating speed of the drum is 75 r/min;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the magnetic field intensity of the upper drum is 0.15T, and the rotating speed of the drum is 70 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 80 r/min.
(4) And (3) drying: conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained after the treatment in the step (3), to drying equipment for 25min at 250 ℃ to ensure that the water content of the quartz sand is less than 0.5 percent and the discharge temperature of the quartz sand materials with two granularity levels reaches 95 ℃.
(5) Electric selection: and (5) electrically selecting the quartz sand with two granularity levels treated in the step (4) by a six-roller electric selector, wherein during electric selection, the quartz sand obtained by upper-layer selection and separation of the six-roller electric selector is guided into a middle-layer selection and separation area for selection, and the quartz sand material obtained by middle-layer selection and separation is guided into a lower-layer selection and separation area for selection.
When the granularity of the quartz sand is between 0.15mm and 0.83mm, the sorting voltage is 34kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 120r/min, 100r/min and 90r/min respectively;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the sorting voltage is 31kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 140r/min, 130r/min and 120r/min respectively.
SiO in quartz sand with granularity of 0.15-0.83 mm purified by the embodiment 2 The content of SiO in the quartz sand is 99.95 percent, the content of ferric oxide is less than or equal to 20ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.93 percent, the content of ferric oxide is less than or equal to 23ppm, and the high purity is achievedAnd (4) quality standard of quartz sand.
Example 4:
a method for purifying quartz sand raw materials comprises the following steps:
(1) selecting materials: selecting SiO with granularity below 4mm 2 The content of the iron oxide in the common quartz sand (quartz sand rough concentrate) is about 97.4 percent, and the content of the iron oxide in the quartz sand is 0.02 to 0.50 percent.
(2) Screening: firstly, conveying a quartz sand raw material to a vibrating screen (the aperture of a screen hole is 0.83mm) for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen (the aperture of the screen hole is 0.15mm) for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; then conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen (the aperture of the screen hole is 0.045mm) for three-stage screening treatment to obtain the quartz sand with the granularity of 0.045-0.15 mm and the quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
(3) Magnetic separation: respectively conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained by the treatment in the step (2), into a dry double-drum magnetic separator to sequentially carry out magnetic separation roughing treatment and magnetic separation concentrating treatment so as to remove magnetic impurities;
the magnetic separation roughing treatment is carried out on an upper cylinder in a dry double-cylinder magnetic separator, and the magnetic separation fine separation treatment is carried out on a lower cylinder in the dry double-cylinder magnetic separator;
when the granularity of the quartz sand is between 0.15mm and 0.83mm, the magnetic field intensity of the upper drum is 0.18T, and the rotating speed of the drum is 60 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 70 r/min;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the magnetic field intensity of the upper drum is 0.20T, and the rotating speed of the drum is 75 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 80 r/min.
(4) And (3) drying: conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained after the treatment in the step (3), to drying equipment for 20min at 290 ℃, so that the water content of the quartz sand is less than 0.5%, and the discharge temperature of the quartz sand materials with two granularity levels reaches 102 ℃.
(5) Electric separation: and (5) electrically selecting the quartz sand with two granularity levels treated in the step (4) by a six-roller electric selector, wherein during electric selection, the quartz sand obtained by upper-layer selection and separation of the six-roller electric selector is guided into a middle-layer selection and separation area for selection, and the quartz sand material obtained by middle-layer selection and separation is guided into a lower-layer selection and separation area for selection.
When the granularity of the quartz sand is between 0.15 and 0.83mm, the sorting voltage is 32kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 120r/min, 110r/min and 100r/min respectively;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the sorting voltage is 36kV, and the rotating speeds of the cylinders in the upper layer sorting area, the middle layer sorting area and the lower layer sorting area are 170r/min, 140r/min and 110r/min respectively.
SiO in quartz sand with granularity of 0.15-0.83 mm purified by the embodiment 2 The content of SiO in the quartz sand is 99.95 percent, the content of ferric oxide is less than or equal to 20ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.93 percent, the content of ferric oxide is less than or equal to 22ppm, and the quality standards of the high-purity quartz sand are all reached.
Example 5:
a method for purifying quartz sand raw materials comprises the following steps:
(1) selecting materials: selecting SiO with granularity below 4mm 2 The content of the iron oxide in the common quartz sand (quartz sand rough concentrate) is 0.02-0.50%.
(2) Screening: firstly, conveying a quartz sand raw material to a vibrating screen (the aperture of a screen hole is 0.83mm) for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen (the aperture of the screen hole is 0.15mm) for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; then conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen (the aperture of the screen hole is 0.045mm) for three-stage screening treatment to obtain the quartz sand with the granularity of 0.045-0.15 mm and the quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use.
(3) Magnetic separation: respectively conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained by the treatment in the step (2), into a dry double-drum magnetic separator to sequentially carry out magnetic separation roughing treatment and magnetic separation concentrating treatment so as to remove magnetic impurities;
the magnetic separation roughing treatment is carried out on an upper cylinder in the dry type double-cylinder magnetic separator, and the magnetic separation refining treatment is carried out on a lower cylinder in the dry type double-cylinder magnetic separator;
when the granularity of the quartz sand is between 0.15mm and 0.83mm, the magnetic field intensity of the upper drum is 0.18T, and the rotating speed of the drum is 60 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 65 r/min;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the magnetic field intensity of the upper drum is 0.15T, and the rotating speed of the drum is 70 r/min; the magnetic field intensity of the lower drum is 0.8T, and the rotating speed of the drum is 80 r/min.
(4) And (3) drying: conveying the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of 0.045-0.15 mm, which are obtained after the treatment in the step (3), to drying equipment for 20min at 300 ℃ to ensure that the water content of the quartz sand is less than 0.5% and the discharge temperature of the quartz sand materials with two granularity levels reaches 105 ℃.
(5) Electric selection: and (5) electrically selecting the quartz sand with two granularity levels treated in the step (4) by a six-roller electric selector, wherein during electric selection, the quartz sand obtained by upper-layer selection and separation of the six-roller electric selector is guided into a middle-layer selection and separation area for selection, and the quartz sand material obtained by middle-layer selection and separation is guided into a lower-layer selection and separation area for selection.
When the granularity of the quartz sand is between 0.15mm and 0.83mm, the sorting voltage is 32kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are 120r/min, 100r/min and 80r/min respectively;
when the granularity of the quartz sand is between 0.045mm and 0.15mm, the sorting voltage is 36kV, and the rotating speeds of the cylinders in the upper layer sorting area, the middle layer sorting area and the lower layer sorting area are 165r/min, 140r/min and 115r/min respectively.
Finally, the SiO in the quartz sand with the granularity of 0.15-0.83 mm is purified by the embodiment 2 The content of SiO in the quartz sand is 99.96 percent, the content of ferric oxide is less than or equal to 19ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.94 percent, the content of ferric oxide is less than or equal to 21ppm, and the quality standards of the high-purity quartz sand are all reached.
Comparative example 1:
a method for purifying a quartz sand raw material, which is different from the method in example 5: in the step (4), the discharge temperature of the quartz sand materials with two granularity levels reaches 65 ℃.
The other steps were identical to those of example 5.
Finally, the SiO in the quartz sand with the granularity of 0.15-0.83 mm is purified by the comparative example 2 The content of SiO in the quartz sand is 99.65 percent, the content of ferric oxide is less than or equal to 1400ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.45 percent, the content of ferric oxide is less than or equal to 1450ppm, and the quality standard of high-purity quartz sand can not be reached.
Comparative example 2:
a method for purifying a quartz sand raw material, which is different from the method in example 5: in the step (2), quartz sand with the granularity of 0.075-0.83 mm and quartz sand with the granularity of 0.045-0.75 mm are obtained through the same screening.
The other steps were identical to those of example 5.
Finally, the SiO in the quartz sand with the granularity of 0.075-0.83 mm is purified by the comparative example 2 The content of SiO in the quartz sand is 99.80 percent, the content of ferric oxide is less than or equal to 700ppm, and the granularity is between 0.045 and 0.075mm 2 The content is 99.75 percent, the content of ferric oxide is less than or equal to 720ppm, and the quality standard of high-purity quartz sand can not be achieved.
Comparative example 3:
a method for purifying a quartz sand raw material, which is different from the method in example 5: in the step (2), quartz sand with the granularity of 0.15-4.0 mm and quartz sand with the granularity of 0.045-0.15 mm are obtained through the same screening.
The other steps were identical to those of example 5.
Finally, the SiO in the quartz sand with the granularity of 0.15-4.0 mm is purified by the comparative example 2 The content is 99.75 percent, the content of ferric oxide is less than or equal to 800ppm, the quality standard of high-purity quartz sand can not be achieved, and the granularity of SiO in the quartz sand is between 0.045 and 0.15mm 2 The content is 99.93 percent, the content of ferric oxide is less than or equal to 21ppm, and the quality standard of high-purity quartz sand can be achieved.
Comparative example 4:
a method for purifying a quartz sand raw material, which is different from the method in example 5: the method sequentially comprises the steps of material selection, screening, drying, magnetic separation and electric separation, wherein the steps of material selection, screening, drying, magnetic separation and electric separation correspond to the steps (1), (2), (4), (3) and (5) in the embodiment 5.
Finally, the SiO in the quartz sand with the granularity of 0.15-0.83 mm is purified by the comparative example 2 The content of SiO in the quartz sand is 99.85 percent, the content of ferric oxide is less than or equal to 500ppm, and the granularity is between 0.045 and 0.15mm 2 The content is 99.80 percent, the content of ferric oxide is less than or equal to 540ppm, and the quality standard of high-purity quartz sand can not be achieved.
Comparative example 5:
a method for purifying a quartz sand raw material, which is different from the method in example 5: the method sequentially comprises the steps of material selection, screening, drying, electric separation and magnetic separation, wherein the steps of material selection, screening, drying, magnetic separation and electric separation correspond to the steps (1), (2), (4), (5) and (3) in the embodiment 5.
Finally, the SiO in the quartz sand with the granularity of 0.15-0.83 mm is purified by the comparative example 2 99.62 percent of SiO in the quartz sand with ferric oxide content less than or equal to 1300ppm and granularity between 0.045 and 0.15mm 2 The content is 99.50 percent, the content of ferric oxide is less than or equal to 1350ppm, and the quality standard of high-purity quartz sand can not be achieved.

Claims (6)

1. A method for purifying a quartz sand raw material is characterized by comprising the following steps:
(1) screening: firstly, conveying quartz sand raw materials to a vibrating screen for primary screening treatment to obtain quartz sand with the granularity of less than 0.83 mm; then conveying the quartz sand with the granularity of less than 0.83mm to another vibrating screen for secondary screening treatment to obtain the quartz sand with the granularity of 0.15-0.83 mm and the quartz sand with the granularity of less than 0.15 mm; conveying the quartz sand with the granularity of less than 0.15mm to another vibrating screen for three-stage screening treatment to obtain quartz sand with the granularity of 0.045-0.15 mm and quartz sand with the granularity of less than 0.045 mm; selecting quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm, and controlling the water content of the quartz sand to be below 3% for later use;
(2) magnetic separation: respectively conveying quartz sand with the granularity of 0.15-0.83 mm and quartz sand with the granularity of 0.045-0.15 mm to a double-drum magnetic separator for magnetic separation roughing treatment and magnetic separation concentrating treatment in sequence; the magnetic separation roughing treatment is carried out on an upper cylinder in a double-cylinder magnetic separator, and the magnetic separation fine separation treatment is carried out on a lower cylinder in the double-cylinder magnetic separator; the double-drum magnetic separator is a dry double-drum magnetic separator;
when the granularity of the quartz sand is between 0.15 and 0.83mm, the magnetic field intensity of the upper drum is 0.08 to 0.30T, and the rotating speed of the roller is 40 to 60 r/min; the magnetic field intensity of the lower drum is 0.5-0.8T, and the rotating speed of the drum is 50-70 r/min;
when the granularity of the quartz sand is between 0.045 and 0.15mm, the intensity of the magnetic field of the upper drum is 0.12 to 0.30T, and the rotating speed of the drum is 60 to 80 r/min; the magnetic field intensity of the lower drum is 0.6-0.8T, and the rotating speed of the roller is 70-90 r/min;
(3) and (3) drying: conveying the quartz sand obtained after the treatment in the step (2) to drying equipment for drying treatment, wherein the discharge temperature of the dried quartz sand is controlled to be 70-120 ℃;
(4) electric separation: and (4) conveying the quartz sand obtained after the treatment in the step (3) to an electric separator for electric separation to obtain high-purity quartz sand.
2. The method for purifying a quartz sand raw material as recited in claim 1, wherein in the step (4), the electric separator is a six-roller electric separator, during electric separation, the quartz sand separated by the upper separation region of the six-roller electric separator is introduced into the middle separation region for separation, the quartz sand separated by the middle separation region is introduced into the lower separation region for separation, the rotating speeds of the cylinders of the upper, middle and lower separation regions are sequentially reduced, and the separation voltages of the upper, middle and lower separation regions are the same.
3. The method for purifying the quartz sand raw material as claimed in claim 2, wherein in the step (4), when the particle size of the quartz sand is 0.15-0.83 mm, the sorting voltage is 25 kV-40 kV, and the rotation speed of each cylinder in the upper sorting region, the middle sorting region and the lower sorting region is 60-160 r/min, 50-140 r/min and 40-120 r/min respectively;
when the granularity of the quartz sand is between 0.045 and 0.15mm, the sorting voltage is 20kV to 36kV, and the rotating speeds of the cylinders in the upper-layer sorting area, the middle-layer sorting area and the lower-layer sorting area are respectively 60 to 200r/min, 50 to 190r/min and 40 to 180 r/min.
4. The method for purifying the quartz sand raw material as claimed in any one of claims 1 to 3, wherein in the step (1), the granularity of the quartz sand raw material is below 4mm, the quartz sand is quartz sand rough concentrate, and SiO in the quartz sand is 2 The content is 90-98%, and the content of ferric oxide in the quartz sand is 0.02-0.50%.
5. A purification method of quartz sand raw material according to any one of claims 1 to 3, characterized in that in the step (3), the drying temperature of the quartz sand is 250 to 300 ℃, and the drying time is 20 to 30 min.
6. The method for purifying the quartz sand raw material as claimed in any one of claims 1 to 3, wherein the water content of the quartz sand after the drying treatment in the step (3) is less than 0.5%.
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