A combined method for purifying sedimentary facies quartz sand by acid-deacidification-grading

Abstract

The application discloses a kind of deposition phase quartz sand acid washing-acid removal-classification combined purification method, comprising the following steps: S1, the granularity composition is 0.105mm-0.71mm content accounts for no less than 90%, SiO2 Content is not less than 97% of deposition phase quartz sand is immersed in acid-containing solution and is carried out acid chemical corrosion, the present application relates to mineral processing technical field.The deposition phase quartz sand acid washing-acid removal-classification combined purification method, by using acid washing-classification combined purification method, under the action of friction-acid chemical corrosion, the fine particles, microfine particles feldspar debris and clay minerals obtained by decomposition or dispersion are quickly separated by classification process, which can significantly reduce the consumption of acidic medium, shorten the purification time, improve the production efficiency and quality of low-iron quartz sand, and help to avoid excessive conversion of the feldspar debris and clay minerals into metal ions and complexes, reduce the separation difficulty of impurity minerals and elements and water, and reduce the environmental protection treatment cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, in particular to a deposition phase quartz sand acid washing-acid removal-grading combined purification method. BACKGROUND

[0002] The deposition phase quartz sand mainly includes aeolian phase desert sand, river and lake phase quartz sand and clay mineral associated type quartz sand, wherein the aeolian phase desert sand has huge reserves in Tongliao, Inner Mongolia, Shuangliao, Jilin and Zhangwu, Liaoning, China, and the main mineral composition thereof is quartz, iron-containing potassium sodium feldspar and a small amount of mica, zirconium and titanium sand; the particle size of-0.71 mm accounts for more than 90%, and the aeolian phase desert sand is affected by weathering erosion and natural transportation, so that the quartz and iron-containing potassium sodium feldspar in the aeolian phase desert sand have high roundness, the quartz has high hardness, the iron-containing potassium sodium feldspar is more susceptible to weathering, and has more crystal defects and lower hardness.

[0003] The aeolian phase desert sand is pretreated by rubbing, gravity separation and magnetic separation process, and the main chemical composition of the strong magnetic concentrate obtained is that the content of SiO2 is not less than 88% and the content of Al2O3 is not less than 3%, and the strong magnetic concentrate is further subjected to neutral or acid quartz reverse flotation (i.e. feldspar positive flotation) to obtain a flotation quartz concentrate with a SiO2 content of not less than 97% and an Al2O3 content of not more than 0.8%, and in actual operation, the SiO2 content of the flotation quartz concentrate is as high as possible and the Al2O3 and Fe2O3 contents are as low as possible.

[0004] Due to the influence of flotation selectivity, a small amount of iron-containing potassium sodium feldspar is often left in the flotation quartz concentrate, which is the main reason for the high SiO2 content of the quartz concentrate, and the iron-containing potassium sodium feldspar is left in each particle size level, so that static or dynamic acid washing process is often needed to further increase silicon content, reduce aluminum content and reduce iron content.

[0005] At present, the acid washing process in production is usually“(static, dynamic) acid washing→solid-liquid separation(acid recovery)→neutralization and washing→solid-liquid separation(dehydration)”, and the solid-liquid separation is usually carried out by using a belt vacuum filter and a dehydration screen, and is affected by whether there is spraying water, spraying water pressure, filter cloth aperture and screen plate aperture size, so that the fine and micro-fine particles and the complex of aluminum and iron minerals are often left in the acid solution, thereby causing the Al2O3 and Fe2O3 contents of the quartz concentrate to be too high, or through long-time acid washing, the iron-containing potassium sodium feldspar and kaolin particles are completely dissolved into metal ions and complex state, although the effect of increasing silicon content, reducing aluminum content and reducing iron content of the quartz sand is achieved, but the acid washing is excessive, the amount of acid medium is increased, the acid washing time is too long, the acid washing efficiency is reduced, and the production cost is increased. SUMMARY

[0006] (I) Technical problems solved

[0007] In view of the deficiencies of the prior art, the present application provides a deposition phase quartz sand acid pickling-acid removal-grading combined purification method, which solves the problems of excessive acid pickling, increased use of acid medium, excessively long acid pickling time, reduced acid pickling efficiency, and increased production cost caused by the existing acid pickling process.

[0008] (II) Technical solution

[0009] To achieve the above object, the present application is implemented by the following technical solution: a deposition phase quartz sand acid pickling-acid removal-grading combined purification method, comprising the following steps:

[0010] S1, immerse the deposition phase quartz sand with a particle size composition of 0.105mm-0.71mm and a content ratio of not less than 90% and a SiO2 content of not less than 97% in an acid-containing solution for acid chemical corrosion, wherein in the acid medium, the solid-liquid ratio of the acid chemical corrosion process of the deposition phase quartz sand is 1-3:1, and the implementation mode includes but is not limited to static corrosion and dynamic corrosion, wherein the dynamic acid chemical corrosion efficiency is higher than that of static acid chemical corrosion, and the implementation mode of dynamic acid chemical corrosion can be mechanical stirring, self-grinding overturning and upward liquid flow intervention mode;

[0011] S2, after dynamic acid chemical corrosion for 0.5-2.0 hours, perform solid-liquid separation on the acid-pickled quartz sand and the acid-containing solution, recover the acid solution and obtain the acid-pickled quartz sand;

[0012] S3, mix the acid-pickled quartz sand with a neutral or alkaline aqueous solution, perform hydraulic classification and desliming on the acid-pickled quartz sand at a mass concentration of not higher than 30%, remove <0.105mm particle size minerals by overflow, and obtain a bottom stream containing quartz sand;

[0013] S4, dehydrate the bottom stream containing quartz sand, and obtain low-iron quartz sand with a particle size composition of 0.105mm-0.71mm and a Fe2O3 content of not higher than 0.010%.

[0014] Preferably, the deposition phase quartz sand with a SiO2 content of not less than 97% in step S1 is obtained by pretreatment, and the pretreatment process includes but is not limited to scrubbing, desliming, classification, gravity separation, magnetic separation, scrubbing-flotation, wherein the main mineral composition of the flotation concentrate is quartz, a small amount of feldspar or clay minerals such as kaolin and bentonite, and the SiO2 content of the natural deposition phase quartz sand can directly exceed 97%, which can still be operated according to this method, the higher the SiO2 content, the lower the Al2O3 and Fe2O3 content, and the lower the acid pickling cost.

[0015] Preferably, the quartz sand in the step S1 is deposited in a sedimentary facies, including but not limited to aeolian desert sand, river and lake sedimentary facies quartz sand and clay mineral associated quartz sand, and the acid used includes but is not limited to hydrofluoric acid, hydrochloric acid and sulfuric acid in inorganic acid, and oxalic acid and citric acid in organic acid, or a mixed acid of organic acid and inorganic acid (such as hydrofluoric acid and oxalic acid).

[0016] Preferably, the implementation of the step S3 is an upward water flow type hydrocyclone and an overflow type desliming bucket, and the upward water flow is not less than 11.5 m 3 / h·m 2 , respectively obtaining a classified overflow and a classified underflow, the classified overflow containing <0.105 mm particle size feldspar, clay mineral debris and metal ion flocculation, and the classified underflow being a quartz sand-containing slurry.

[0017] Preferably, the hydrocyclone comprises a cylinder, a motor is fixedly connected to the top of the cylinder, one end of a motor output shaft is fixedly connected to a rotating shaft through a shaft coupling, a spiral blade is fixedly connected to the bottom of the surface of the rotating shaft, a worm gear is fixedly connected to the surface of the rotating shaft and above the spiral blade, a cross rod is rotatably connected between the two sides of the inner wall of the cylinder, a worm is fixedly connected to the cross rod and engaged with the worm gear, and a canoe is fixedly connected to the top and the bottom of the two sides of the surface of the cross rod, and a through hole is formed in the surface of the canoe.

[0018] Preferably, the top of one side of the cylinder is communicated with an overflow pipe, the top of one side of the inner wall of the cylinder is fixedly connected with a limiting frame, a filter screen is movably connected to the bottom of the inner wall of the limiting frame, the filter screen is arranged at the overflow port of the overflow pipe, and a mounting assembly is arranged on the top of the filter screen for dismounting the filter screen.

[0019] Preferably, the mounting assembly comprises a top plate fixedly connected to the top of the filter screen, the top plate is movably connected to one side of the top of the cylinder, a fixing rod is fixedly connected to the front face and the back face of the top of the cylinder, the top end of the fixing rod penetrates through the top plate and extends to the outside of the top plate, an annular seat is fixedly connected to the front face and the back face of the top of the top plate, threaded rods are threadedly penetrated through the two sides of the annular seat, and threaded grooves are formed in the two sides of the fixing rod and matched with the threaded rods.

[0020] Preferably, the bottom of the other side of the cylinder is communicated with a water inlet pipe, and the top of the surface of the cylinder is communicated with a feeding pipe.

[0021] (Three) beneficial effects

[0022] The application provides a sedimentary facies quartz sand acid washing-desliming-classification combined purification method.

[0023] (1), the deposition phase quartz sand acid pickling-acid removal-classification combined purification method, by adopting acid pickling-classification combined purification method, under the friction-acid chemical corrosion, the fine particles, micro-fine particles of feldspar debris and clay minerals obtained by decomposition or dispersion are quickly separated by classification process, which can significantly reduce the consumption of acid medium, shorten the purification time, improve the production efficiency and quality of low iron quartz sand, and help to avoid excessive conversion of the feldspar debris and clay minerals into metal ions and complexes, reduce the separation difficulty of impurity minerals and elements and water, and reduce the environmental protection treatment cost.

[0024] (2), the deposition phase quartz sand acid pickling-acid removal-classification combined purification method, in the process of classification, the spiral blade cooperates with the upward liquid flow to continuously turn the quartz sand deposited at the bottom upward, while the adjusting mechanism drives the paddle to collide with the material, accelerates the separation of fine particles, micro-fine particles of feldspar debris and clay minerals, and the separation and screening of the material are more uniform, and the efficiency of classification is improved.

[0025] (3), the deposition phase quartz sand acid pickling-acid removal-classification combined purification method, by setting a filter screen at the overflow port, the coarse quartz sand is prevented from flowing out of the cylinder together with the separated fine mineral particles, and the threaded rod is rotated out of the threaded groove, so that the filter screen can be pulled out of the cylinder through the top plate, which is convenient for cleaning and prevents the filter screen from being blocked. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The process flow chart of the dynamic acid chemical corrosion-acid removal-classification of the application;

[0027] Figure 2 The schematic diagram of the structure of the application;

[0028] Figure 3 The sectional view of the structure of the application;

[0029] Figure 4 The schematic diagram of the adjusting mechanism and the paddle structure of the application;

[0030] Figure 5 The local enlarged view of A in the application; Figure 3

[0031] In the figure: 1, cylinder; 2, motor; 3, rotating shaft; 4, spiral blade; 5, worm; 6, cross bar; 7, worm; 8, paddle; 9, through hole; 10, water inlet pipe; 11, feed pipe; 12, overflow pipe; 13, limiting frame; 14, filter screen; 15, top plate; 16, fixed rod; 17, annular seat; 18, threaded rod; 19, threaded groove. DETAILED DESCRIPTION

[0032] ​With reference to the accompanying drawings on the basis of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] Embodiment one

[0034] With reference to the accompanying drawings on the basis of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. Figure 1 The present application provides a combined purification method of acid washing-deacidification-grading for sedimentary facies quartz sand, which comprises the following steps:

[0035] Taking the aeolian facies desert sand in Tongliao region of Inner Mongolia as an example, the raw ore is subjected to impurity removal, mechanical scrubbing, desliming, grading, gravity separation, magnetic separation, medium scrubbing-flotation to obtain the flotation quartz sand. The chemical composition and particle size composition of the flotation quartz sand are shown in Table 1.

[0036] Table 1 Particle size screen analysis and particle grading test results of the flotation quartz sand

[0037] Particle size (mm) Yield (%) Cumulative yield (%) SiO2(%) Al2O3(%) Fe203(%) +0.71 0.00 0.00 0.00 0.00 0.00 -0.71+0.5 1.30 1.30 99.45 0.19 0.031 -0.5+0.45 4.14 5.44 99.37 0.25 0.037 -0.45+0.3 44.86 50.30 99.29 0.32 0.040 -0.3+0.2 40.56 90.86 98.95 0.35 0.047 -0.2+0.125 8.59 99.45 98.77 0.42 0.056 -0.125 0.55 100.00 98.68 0.60 0.070 Total 100.00 / 99.12 0.33 0.044

[0038] The flotation quartz sand is subjected to continuous dynamic acid chemical leaching purification for 1.5 h at a quartz sand mass concentration of 60% by using hydrofluoric acid and oxalic acid as the chemical leaching medium, with an initial amount of 75 kg / t and a circulating supplement amount of 25 kg / t, and under the condition of heat preservation at 80°C. The rotation speed of the mechanical stirring type purification machine is 294 r / min. The purified quartz sand is directly filtered by a vacuum belt filter to recover the acid liquor. The pore size of the belt vacuum filter is 40 μm. The deacidified quartz sand is subjected to chemical composition analysis of the whole particle size and the particle size, as shown in Table 2.

[0039] Table 2 Chemical composition analysis of the continuous dynamic deep purification quartz sand

[0040] Particle size (mm) Yield (%) Cumulative yield (%) SiO2(%) Al203(%) Fe203(%) +0.71 0.00 0.00 0.00 0.00 0.00 -0.71+0.5 2.01 2.01 99.41 0.15 0.0086 -0.5+0.45 5.79 7.80 99.30 0.19 0.0094 -0.45+0.3 46.90 54.70 99.22 0.25 0.010 -0.3+0.2 36.90 91.60 99.15 0.30 0.015 -0.2+0.125 7.47 99.07 99.10 0.39 0.016 -0.125 0.93 100.00 99.01 0.47 0.019 Total 100.00 / 99.19 0.28 0.012

[0041] The continuous dynamic deep purification quartz sand is taken out in an amount of 5 kg and mixed with water to form a quartz sand slurry with a mass concentration of 30%. The slurry is stirred for 1 min, and then statically placed for 30 s. The upper layer of acid liquor is poured out. The above steps are repeated twice to obtain the cleaned quartz sand. The whole particle size and the particle size of the cleaned quartz sand are subjected to chemical composition analysis, as shown in Table 3.

[0042] Table 3 Chemical composition analysis of the continuous dynamic deep purification-cleaned quartz sand

[0043] Particle size (mm) Yield (%) Cumulative yield (%) SiO2(%) Al2O3(%) Fe203(%) +0.71 0.00 0.00 0.00 0.00 0.00 -0.71+0.5 2.07 2.07 99.40 0.15 0.0087 -0.5+0.45 5.69 7.76 99.32 0.18 0.0094 -0.45+0.3 46.30 54.06 99.27 0.24 0.0098 -0.3+0.2 37.25 91.46 99.18 0.27 0.011 -0.2+0.125 7.84 99.15 99.12 0.30 0.013 -0.125 0.85 100.00 98.91 0.51 0.014 Total 100.00 / 99.23 0.25 0.0105

[0044] The continuous dynamic deep purification quartz sand is classified and deslimed by using the up-flow type hydrocyclone, the used hydrocyclone is 125mm type hydrocyclone, the up-flow water quantity is 11.5m 3 / h·m 2 The classified and deslimed classified sand is analyzed in terms of chemical composition in the whole particle size and the particle size, as shown in Table 4:

[0045] Table 4 Chemical composition analysis of the hydrocyclone quartz sand of the continuous deep purification

[0046] Particle size (mm) Yield (%) Cumulative yield (%) SiO2(%) Al2O3(%) Fe203(%) +0.71 0.00 0.00 0.00 0.00 0.00 -0.71+0.5 2.22 2.22 99.54 0.13 0.0078 -0.5+0.45 5.50 7.72 99.48 0.18 0.0085 -0.45+0.3 47.11 54.82 99.39 0.20 0.0089 -0.3+0.2 37.60 92.42 99.25 0.24 0.0092 -0.2+0.125 7.22 99.64 99.27 0.26 0.011 -0.125 0.36 100.00 99.20 0.30 0.012 Total 100.00 / 99.35 0.22 0.0091

[0047] The test results show that, compared with the acid chemical dissolution-deacidification and acid chemical dissolution-deacidification-cleaning processes, the acid chemical dissolution-deacidification-hydrocyclone process has the highest SiO2 content and the lowest Al2O3 and Fe2O3 contents in the obtained quartz sand, and reaches the quality requirements of the low-iron quartz sand for photovoltaic glass (SiO2, ≥99.3%; Al2O3, ≤0.50%; Fe2O3, ≤0.010%), and it can be seen that the acid chemical dissolution-deacidification-hydrocyclone process has significant technical advantages and practicability in the field of producing low-iron quartz sand from the sedimentary aeolian desert sand.

[0048] Example Two

[0049] Based on the example one, please refer to Figures 2 to 4 As shown in the figure, the specific improvements are as follows: the hydrocyclone comprises a cylinder 1, the bottom of the cylinder 1 is provided with a discharge pipe, the discharge pipe and the water inlet pipe 10 are both provided with electromagnetic valves, the top of the cylinder 1 is fixedly connected with a motor 2, the motor 2 is provided, which increases the flowability of the water flow, and can change the rotating speed to improve the separation efficiency, and one end of the output shaft of the motor 2 is fixedly connected with a rotating shaft 3 through a shaft coupling, the bottom end of the rotating shaft 3 penetrates through the cylinder 1 and extends into the inside of the cylinder 1, the bottom of the surface of the rotating shaft 3 is fixedly connected with a spiral blade 4, the surface of the rotating shaft 3 and above the spiral blade 4 are fixedly connected with a worm gear 5, the two sides of the inner wall of the cylinder 1 are rotatably connected with a cross rod 6, the middle of the cross rod 6 is fixedly connected with a worm 7 meshing with the worm gear 5, the top and the bottom of the surface of the two sides of the cross rod 6 are both fixedly connected with a paddle 8, the surface of the paddle 8 is provided with a plurality of through holes 9, the through holes 9 are evenly distributed on the surface of the paddle 8, and the diameter of the through holes 9 is only suitable for the passage of the-0.105mm particle size mineral, the paddle 8 increases the collision with the quartz sand material, which is convenient for classifying and desliming the quartz sand;

[0050] The bottom of the other side of the cylinder 1 is communicated with a water inlet pipe 10, the water inlet pipe 10 is connected with an external water conveying device, and the top of the surface of the cylinder 1 is communicated with a feeding pipe 11.

[0051] Through the structure of the above setting, in use, the quartz sand solution enters the cylinder 1 through the feed pipe 11, the external water conveying device enters water through the water inlet pipe 10, the motor 2 is started, the rotating shaft 3 is driven to rotate, the rotating shaft 3 drives the spiral blade 4 to rotate, the spiral blade 4 can continuously turn up the quartz sand deposited at the bottom in cooperation with the upward flow, and the quartz sand is screened and separated, at the same time, the rotating shaft 3 drives the worm gear 5 to rotate, the worm gear 5 drives the cross rod 6 to rotate through the worm 7, and the cross rod 6 drives the boat 8 to rotate, so that the upward material is stirred and collided, the friction between the material and the upward material is increased, the separation of the fine and micro-fine feldspar debris and clay minerals is accelerated, and the separation and screening of the material are more uniform.

[0052] Example three

[0053] In combination with example one and example two, please refer to Figure 2 , Figure 3 and Figure 5 , the specific improvements are as follows: the top of one side of the cylinder 1 is communicated with an overflow pipe 12, the overflow pipe 12 is used for overflow removal of -0.105mm particle size minerals, the top of one side of the inner wall of the cylinder 1 is fixedly connected with a limiting frame 13, which is used for limiting installation of a filter screen 14, and the bottom of the inner wall of the limiting frame 13 is movably connected with the filter screen 14, the filter screen 14 prevents the underflow containing quartz sand from overflowing out of the cylinder 1, the filter screen 14 is arranged at the overflow port of the overflow pipe 12, and the top of the filter screen 14 is provided with a mounting assembly for dismounting the filter screen 14;

[0054] The mounting assembly comprises a top plate 15 fixedly connected with the top of the filter screen 14, the top plate 15 is movably connected to one side of the top of the cylinder 1, the front and back surfaces of the top of the cylinder 1 are both fixedly connected with a fixed rod 16, the top end of the fixed rod 16 penetrates through the top plate 15 and extends to the outside of the top plate 15, the front and back surfaces of the top of the top plate 15 are both fixedly connected with an annular seat 17, and the two sides of the annular seat 17 are both threadedly penetrated through a threaded rod 18, and the two sides of the fixed rod 16 are both provided with a threaded groove 19 matched with the threaded rod 18, so that the filter screen 14 can be manually taken out for cleaning without the aid of external tools, and the operation is simple and fast.

[0055] Through the structure of the above setting, the fine and micro-fine feldspar debris and clay minerals separated out flow out of the cylinder 1 through the overflow pipe 12, the filter screen 14 prevents the quartz sand coarse particles from flowing out of the cylinder 1 together with the fine mineral separated out, and after the threaded rod 18 is rotated to the outside of the annular seat 17 and moves out of the threaded groove 19, the filter screen 14 can be pulled out of the cylinder 1 through the top plate 15, so that the clogged filter screen 14 can be cleaned.

[0056] Meanwhile, the contents not described in detail in the specification are all the prior art known to those skilled in the art, and the model parameters of each electric appliance are not specifically limited, and the conventional equipment suitable for the equipment can be used.

[0057] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A combined purification method for sedimentary quartz sand by acid washing, deacidification, and classification, characterized in that: Includes the following steps: S1. Immerse sedimentary quartz sand with a particle size composition of 0.105mm-0.71mm and a content of not less than 90% and a SiO2 content of not less than 97% in an acidic solution for acid chemical etching for 0.5-1.5 hours. S2. The acid-washed quartz sand and the acid-containing solution are subjected to solid-liquid separation to recover the acid solution and obtain the acid-washed quartz sand. S3. The acid-washed quartz sand is hydraulically classified and deslimed at a concentration not exceeding 30% by mass. The overflow removes minerals with a particle size of <0.105mm to obtain the underflow containing quartz sand. The hydraulic classification and desliming are achieved by using an upward flow type hydraulic classifier and an overflow type desliming bucket, with an upward flow rate of not less than 11.5 m³ / h·m². S4. Dewater the underflow containing quartz sand to obtain low-iron quartz sand with a particle size distribution of 0.105mm-0.71mm and an Fe2O3 content of no more than 0.010%. The hydraulic classifier includes a cylinder, a motor is fixedly connected to the top of the cylinder, and a rotating shaft is fixedly connected to one end of the motor output shaft via a coupling. A spiral blade is fixedly connected to the bottom of the rotating shaft surface, and a worm gear is fixedly connected to the rotating shaft surface above the spiral blade. A crossbar is rotatably connected between the two sides of the inner wall of the cylinder, and a worm gear meshing with the worm gear is fixedly connected to the middle of the crossbar. Samples are fixedly connected to the top and bottom of both sides of the crossbar surface, and through holes are opened on the surface of the samples.

2. The combined purification method of sedimentary phase quartz sand by acid washing-deacidification-classification according to claim 1, characterized in that: The sedimentary quartz sand with a SiO2 content of not less than 97% in step S1 is obtained through pretreatment. The pretreatment process includes scrubbing, desliming, classification, gravity separation, magnetic separation, and flotation.

3. The combined purification method of sedimentary phase quartz sand by acid washing-deacidification-classification according to claim 1, characterized in that: The sedimentary quartz sand in step S1 includes aeolian desert sand, fluvial and lacustrine sedimentary quartz sand, and clay mineral-associated quartz sand.

4. The combined purification method of sedimentary phase quartz sand by acid washing-deacidification-classification according to claim 1, characterized in that: An overflow pipe is connected to the top of one side of the cylinder, a limiting frame is fixedly connected to the top of one side of the inner wall of the cylinder, and a filter screen is movably connected to the bottom of the inner wall of the limiting frame. The filter screen is set at the overflow port of the overflow pipe, and an installation component is provided on the top of the filter screen for disassembling and assembling the filter screen.

5. The combined purification method of sedimentary phase quartz sand by acid washing, deacidification, and classification according to claim 4, characterized in that: The mounting assembly includes a top plate fixedly connected to the top of the filter screen. The top plate is movably connected to one side of the top of the cylinder. Fixed rods are fixedly connected to both the front and back sides of the top of the cylinder. The top ends of the fixed rods penetrate the top plate and extend to the outside of the top plate. Annular seats are fixedly connected to both the front and back sides of the top of the top plate, and threaded rods are threaded through both sides of the annular seats. Threaded grooves that match the threaded rods are provided on both sides of the fixed rods.

6. The combined purification method of sedimentary phase quartz sand by acid washing-deacidification-classification according to claim 1, characterized in that: A water inlet pipe is connected to the bottom of the other side of the cylinder, and a feed pipe is connected to the top of the surface of the cylinder.

Images