CN114160293A - Wet production process for reducing mica content in machine-made sand - Google Patents
Wet production process for reducing mica content in machine-made sand Download PDFInfo
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- CN114160293A CN114160293A CN202111495345.5A CN202111495345A CN114160293A CN 114160293 A CN114160293 A CN 114160293A CN 202111495345 A CN202111495345 A CN 202111495345A CN 114160293 A CN114160293 A CN 114160293A
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- 239000004576 sand Substances 0.000 title claims abstract description 91
- 239000010445 mica Substances 0.000 title claims abstract description 62
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 126
- 238000012216 screening Methods 0.000 claims abstract description 23
- 238000005406 washing Methods 0.000 claims abstract description 22
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000002351 wastewater Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 13
- 230000008901 benefit Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
Abstract
The invention discloses a wet production process for reducing mica content in machine-made sand, which is used for reducing the mica content in the machine-made sand and comprises the following steps: crushing the raw material by a crusher to obtain a material a; screening the material a to obtain a material b and a material c; mica removing is carried out on the material b through spiral chute equipment; washing the sorted material b with sand washing equipment to obtain a material d and sand-containing wastewater; taking the combined material d and the material c as finished sand and piling; screening mica on the sand-containing wastewater by using screening equipment, and obtaining a material e by using a stone powder recovery device; and (5) stacking the materials e. By adopting the production process, the mica content in the machine-made sand can be effectively reduced to be below 2 percent, and the requirements of national standards and industrial standards are met.
Description
Technical Field
The invention relates to the technical field of sandstone production, in particular to a wet production process for reducing the content of machine-made sand mica in a sandstone aggregate processing process.
Background
The sandstone aggregate is an indispensable and irreplaceable resource raw material with the largest consumption for building, road, bridge, water conservancy, municipal infrastructure and the like. According to different sources of aggregates, the aggregates can be divided into natural sandstone aggregates and machine-made sandstone aggregates. Wherein, the gravels collected by rivers, lakes and seas are collectively called natural gravels, which is a natural resource; the sand produced by mining and crushing and screening equipment is called machine-made sand aggregate. As the demand of the sandstone aggregate is greatly increased due to the large-scale development of infrastructure in China, the natural sandstone aggregate as an unrenewable resource cannot meet the increasing market demand, and the market share of the machine-made sandstone aggregate is gradually expanded. When the raw rock is used for producing the machine-made sandstone aggregate, the mica content in the machine-made sand is generally higher, the mica in the sand is generally in a sheet shape, the surface is smooth, the strength is very low, the adhesive force with cement paste is poor, when the mica content in the sand exceeds a certain limit, the indexes of the concrete such as the workability, the strength, the durability and the like are obviously reduced, and the influence on the quality of the concrete is larger. Therefore, the content of the mica in the sand is limited by national standards and a plurality of industry standards, for example, the content of the mica in the sand is not more than 2 percent limited by GB/T14684 for building sand and DL/T5144 for hydraulic concrete construction specifications. Therefore, when the raw rock with high mica content is used for producing the machine-made sand, the mica content must be controlled to improve the quality of the machine-made sand and increase the market competitiveness of the machine-made sand. However, at present, no mature wet production process for reducing the mica content in the machine-made sand exists in China.
Disclosure of Invention
The invention aims to solve the technical problem of reducing the mica content in machine-made sand and aims to provide a wet production process for reducing the mica content in the machine-made sand.
The invention is realized by the following technical scheme:
a wet production process for reducing the mica content in machine-made sand comprises the following steps:
crushing the raw material by a crusher to obtain a material a;
screening the material a to obtain a material b and a material c;
mica removing is carried out on the material b through spiral chute equipment;
washing the sorted material b with sand washing equipment to obtain a material d and sand-containing wastewater;
taking the combined material d and the material c as finished sand and piling;
screening mica on the sand-containing wastewater by using screening equipment, and obtaining a material e by using a stone powder recovery device;
and (5) stacking the materials e.
Preferably, the material a is screened by a circular vibrating screen which is provided with a screen mesh with a screen hole of 3 mm.
Preferably, after the material a is screened, the method comprises the following steps:
s1, adding a material c into the crusher;
s2, crushing the raw material and the material c through a crusher to obtain a material a 1;
s3, screening the material a1 to obtain a material b and a material c 1;
s4, repeating the steps S1-S3N times to obtain a material b and a material c(N+1)Wherein N is a positive integer greater than or equal to 0.
Preferably, when mica removing is carried out on the material b through a spiral chute device, the method further comprises the following steps:
adding part of the material c into a rod mill to obtain a material f;
mica removing is carried out on the material f through spiral chute equipment;
and (4) washing the sorted material f by using sand washing equipment to obtain a material g and sand-containing wastewater.
Preferably, mica is screened out from the sand-containing wastewater, and then the sand-containing wastewater is recycled by a stone powder recycling device to obtain a material e.
Preferably, the spiral chute apparatus is a high frequency vibration spiral chute.
Preferably, the sand washing equipment is a spiral sand washing machine.
Preferably, the screening device is a high-frequency vibration fine screen.
Preferably, the aperture of the sieve pore of the high-frequency vibration fine sieve is 0.3mm, and the size of the sieve pore can be adjusted according to test data.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the wet production process for reducing the mica content in the machine-made sand is based on wet production and has no dust pollution.
2. According to the wet production process for reducing the mica content in the machine-made sand, provided by the invention, the materials are sequentially treated by the spiral chute and sand washing, so that the removal rate of mica is improved, and the mica content in the materials is effectively reduced.
3. The wet production process for reducing the mica content in the machine-made sand provided by the invention has the advantages of simple flow and better reliability, and meanwhile, the production equipment or system adopted by the production process has the advantages of simple structure, high separation efficiency, wide application range, large processing capacity, small occupied area, easiness in operation and management and the like, the mica content in the machine-made sand can be obviously reduced, the mica content in the machine-made sand produced by the production process is lower than 2%, and the requirements of national standards and industrial standards are met. Particularly, when the mica content in the raw ore is higher, the production process can effectively improve the quality of the machine-made sand product, increase the market competitiveness of the machine-made sand and have better economic benefit.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a wet process for reducing mica content in machine-made sand according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another wet-process production process for reducing the mica content in machine-made sand according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, if the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate an orientation or positional relationship based on that shown in the drawings, it is merely for convenience of description and simplicity of description, and does not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
As shown in fig. 1-2, the wet production process for reducing the mica content in the machine-made sand provided by this embodiment includes the following steps:
crushing raw materials by a crusher to obtain a material a;
according to different production environments, different types of crushers can be selected, such as a jaw crusher, a counterattack crusher, a gyratory crusher, a cone crusher, a roller crusher, a hammer crusher, a vertical shaft impact crusher and the like.
Screening the material a to obtain a material b and a material c;
the mica in the obtained material a has small volume after the raw materials are crushed by a vertical shaft crusher, and crushed stone with larger particle size can be directly screened from the material a as a finished product according to production requirements. In the embodiment, the material a is mainly screened by a plurality of layers of screens, wherein the plurality of layers of screens sequentially comprise screens with screen mesh sizes of 10mm, 5mm and 3mm, the screens with screen meshes of 10mm and 5mm are mainly selected according to actual production requirements and are used for screening finished crushed stone a and finished crushed stone b, the particle size of the finished crushed stone a is more than 10mm, the particle size of the finished crushed stone b is between 5mm and 10mm, the screen mesh with 3mm is mainly used for separating mica from coarse sand with a particle size of 3-5 mm through mica, the material passing through the screen mesh with 3mm screen mesh size is a mixture of mica and machine-made sand with a particle size smaller than 3mm, namely the material b, the particle size of the material screened by the screen mesh with 3mm screen mesh size is between 3mm and 5mm, namely the material c, according to production requirements, in other embodiments, more screens with screen mesh sizes can be arranged in front of the screen mesh with a screen mesh diameter of 3mm, so as to obtain finished product machine-made sand or finished crushed stone with various grain diameters.
In order to reduce the demand for raw materials when the market demand for machine-made sand is large, in one example, the screened finished crushed stones a and b are added into the vertical shaft crusher again for secondary crushing, so as to increase the discharge amount of the machine-made sand, specifically, the method comprises the following steps:
s1, adding a material c into a vertical shaft crusher;
s2, crushing the raw material and the material c through a vertical shaft crusher to obtain a material a 1;
s3, screening the material a1 to obtain a material b and a material c 1;
s4, repeating the steps S1-S3N times to obtain a material b and a material c(N+1)Wherein N is a positive integer greater than or equal to 0.
It is understood that when the present embodiment is directed to the step-by-step screening of the material a, the material c added to the vertical shaft crusher is understood to be a mixture of the finished crushed stones a and the finished crushed stones b described in the present embodiment.
It should be noted that the value of N is determined according to whether the discharged amount of machine-made sand meets the expected value.
When a plurality of layers of screens are adopted for material screening, the material c1 is screened to obtain finished crushed stone a1 and finished crushed stone b1, wherein the particle size of the finished crushed stone a1 is larger than 10mm, the particle size of the finished crushed stone b1 is between 5mm and 10mm, and the particle size of the residual material c1 is between 3mm and 5 mm.
Step three, mica removing is carried out on the material b through spiral chute equipment;
spiral chute equipment adopts high-frequency vibration spiral chute, and the purpose promotes the separation of mica and mechanism sand, and the follow-up technology of being convenient for is handled, and material b realizes that its lower floor stirs at material b's whirl in-process through high-frequency vibration spiral chute machine chute, and the vibration of high-frequency vibration spiral chute machine bottom can make material b looser to make mica change and float in the surface of water, be convenient for get rid of.
Step four, washing the sorted material b by using sand washing equipment to obtain a material d and sand-containing wastewater;
the sand washing equipment adopts a spiral sand washing machine, mica is easier to float on the water surface through the material b after the spiral chute is vibrated at high frequency, and the mica is removed more thoroughly after the spiral sand washing machine is matched.
Step five, mixing the material d with the material c, outputting and stacking the mixture to be used as finished sand;
after the material d and the material c are mixed, the mixture can be conveyed to a finished product sand silo by an adhesive tape machine for piling.
It will be appreciated that when material a is sieved through the multi-layer screen described above, material c has a particle size of between 3mm and 5 mm.
Bearing in mind that, according to the market demand for fine mechanism sand, in one example, part of the material c is mixed with the material d, and the abundant material c is further processed, the method specifically comprises the following steps:
step T1, adding the abundant part of the material c and the finished crushed stone b into a rod mill to obtain a material f;
step T2, chute is carried out on the material f through a high-frequency spiral chute machine;
and step T3, carrying out sand washing on the material f after the chute through a spiral sand washing machine to obtain a material g and sand-containing wastewater.
And mixing the obtained material g with a material with the particle size of less than 3mm, and piling to form fine machine-made sand.
And sixthly, screening the sand-containing wastewater by using screening equipment, and recovering by using a stone powder recovery device to obtain a material e.
Screening installation chooses the fine screen of high frequency vibration for use for rejecting mica, and the sieve mesh diameter of the fine screen of high frequency vibration can suitably be selected according to the concrete size of mica, and in this embodiment, the sieve mesh diameter sets up to 0.3mm to reject the mica in the material that the particle diameter is less than 0.3 mm.
It can be understood that the sand-containing wastewater comprises sand-containing wastewater obtained by sand washing of the material b and the material f.
After the mica is removed by the high-frequency vibration fine screen, the residual materials are mainly fine sand with the particle size smaller than 0.3mm, so a stone powder recovery device is adopted to recover the fine sand to obtain a material e and output the material e, the material e can be doped into finished product machine-made sand to adjust the fineness modulus of the machine-made sand according to market requirements, and the residual material e is treated as waste materials.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A wet production process for reducing the mica content in machine-made sand is characterized by comprising the following steps:
crushing the raw material by a crusher to obtain a material a;
screening the material a to obtain a material b and a material c;
mica removing is carried out on the material b through spiral chute equipment;
washing the sorted material b with sand washing equipment to obtain a material d and sand-containing wastewater;
taking the combined material d and the material c as finished sand and piling;
screening mica on the sand-containing wastewater by using screening equipment, and obtaining a material e by using a stone powder recovery device;
and (5) stacking the materials e.
2. The wet production process for reducing the mica content in the machine-made sand as claimed in claim 1, wherein the material a is sieved by a circular vibrating screen, and the circular vibrating screen is provided with a screen mesh with a mesh opening of 3 mm.
3. The wet production process for reducing the mica content in the machine-made sand as claimed in claim 1, which is characterized by comprising the following steps after the material a is sieved:
s1, adding a material c into the crusher;
s2, crushing the raw material and the material c through a crusher to obtain a material a 1;
s3, screening the material a1 to obtain a material b and a material c 1;
s4, repeating the steps S1-S3N times to obtain a material b and a material c(N+1)Wherein N is a positive integer greater than or equal to 0.
4. The wet production process for reducing the mica content in machine-made sand according to claim 1, wherein when the material b is subjected to mica removal through a spiral chute device, the wet production process further comprises the following steps:
adding part of the material c into a rod mill to obtain a material f;
mica removing is carried out on the material f through spiral chute equipment;
and (4) washing the sorted material f by using sand washing equipment to obtain a material g and sand-containing wastewater.
5. The wet production process for reducing the mica content in machine-made sand according to claim 1, wherein a material e is obtained by recovering the sand-containing wastewater through a stone powder recovery device after mica screening.
6. The wet production process for reducing the mica content in the machine-made sand according to any one of claims 1 to 5, wherein the spiral chute equipment is a high-frequency vibration spiral chute.
7. The wet production process for reducing the mica content in machine-made sand according to claim 6, wherein the sand washing equipment is a spiral sand washer.
8. The wet process production process for reducing the mica content in machine-made sand of claim 1, wherein the screening device is a high-frequency vibrating fine screen.
9. The wet process production process for reducing the mica content in machine-made sand according to claim 8, wherein the mesh opening size of the high-frequency vibration fine screen is 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495345.5A CN114160293A (en) | 2021-12-08 | 2021-12-08 | Wet production process for reducing mica content in machine-made sand |
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| CN202111495345.5A CN114160293A (en) | 2021-12-08 | 2021-12-08 | Wet production process for reducing mica content in machine-made sand |
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Cited By (1)
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