CN116037295A - Method for removing mica in machine-made sand by wet method - Google Patents

Abstract

In order to solve the technical problem that mica in sand stone is difficult to remove in the prior art, the embodiment of the invention provides a method for removing mica in machine-made sand by a wet method, which comprises the following steps: coarse crushing the machine-made sand raw material, performing vertical shaft impact crushing shaping and rod grinding to obtain machine-made sand with the diameter of-3 mm and-5 mm; floating the machine-made sand with the particle diameter of-3 mm and-5 mm, and separating to obtain a foam product containing the mica mixture, a machine-made sand f finished product and a filter cake; the embodiment of the invention reduces the mica content in the machine-made sand and realizes the comprehensive utilization of mica separated from the machine-made sand.

Description

A wet method for removing mica in machine-made sand

technical field

The invention relates to a wet method for removing mica in machine-made sand.

Background technique

Sand and gravel are the largest, indispensable and irreplaceable resource raw materials for construction, roads, bridges, water conservancy, municipal and other infrastructure construction in my country. According to the different raw materials of sand, it can be divided into natural sand and gravel and machine-made sand and gravel. After long-term over-exploitation, natural sand resources are rapidly decreasing, and machine-made sand will become an important part of cement concrete. Manufactured sand is made of natural rocks, river pebbles, industrial waste, construction waste and mining waste, etc., which are made of rock particles with a particle size of less than 4.75mm after soil removal, mechanical crushing, and screening. Natural rock is the main machine-made sand raw material. When natural rocks such as granite are used to produce machine-made sand and gravel aggregate, if the mica content in the original rock is too high, the free mica content in the machine-made sand is generally high. The mica in the sand is generally in the form of flakes, the surface is smooth, the strength is very low, and the bonding force with the cement slurry is poor. When the mica content in the sand exceeds a certain limit, the workability, strength, durability and other indicators of the concrete are significantly reduced. It has a great influence on the quality of concrete. National standards and many industry standards limit the content of mica in sand. GB/T 14684 of "Sand for Construction" and DL/T 5144 of "Code for Construction of Hydraulic Concrete" limit the content of mica in sand to no more than 2%. Therefore, when the raw rock with high mica content is used to produce machine-made sand, the mica content must be controlled to improve the quality of the machine-made sand and enhance the market competitiveness of the machine-made sand. However, at present, there is no wet process in China that can economically and effectively reduce the content of mica in machine-made sand. The traditional wet process is to remove mica by washing with a large amount of water. This method is not selective for mica and has a high waste rate. The stone loss rate is high, and only part of the free mica can be removed, and the effect is limited.

Contents of the invention

In order to solve the technical problem that the mica in the sand is difficult to remove in the prior art, the embodiment of the present invention provides a wet method for removing mica in the machine-made sand, so as to reduce the content of mica in the machine-made sand and realize the separation from the machine-made sand. Comprehensive utilization of mica.

Embodiments of the present invention are realized through the following technical solutions:

In the first aspect, an embodiment of the present invention provides a wet method for removing mica in machine-made sand, including:

-3mm material b and -5mm material a are obtained after the ore raw materials are crushed, vertical shaft impact crushing and shaping, screening and classification, and rod milling;

Combine -3mm material b and -5mm material a into slurry flotation, and separate to obtain foam product e containing mica mixture and tailings slurry d;

The foam product e containing mica mixture is passed through wet strong magnetic separation, and magnetic separation obtains magnetic separation concentrate and magnetic separation tailings;

Dehydrating the magnetic separation concentrate to obtain a mixture h of biotite and lepidolite;

Dehydration of magnetic separation tailings to obtain muscovite and phlogopite mixture i;

Dewatering the tailings pulp d to obtain a finished product of qualified machine-made sand f.

Further, the mica content in the finished machine-made sand f is less than 2%.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; including:

The ore raw materials are crushed and shaped by vertical shaft impact crushing, and then the first stage of dry screening and the first stage of wet screening are carried out to obtain the finished coarse aggregate c and the aggregate to be rod-milled;

Wherein, the first stage of dry screening includes sequentially passing through the first layer of sieve and the second layer of sieve for dry sieving, and the second stage of wet sieving includes sequentially passing through the third layer of sieve, the fourth layer of The sieve and the fifth sieve are subjected to wet sieving, and the mesh sizes of the first sieve, the second sieve, the third sieve, the fourth sieve and the fifth sieve are successively reduced;

The material between the first screen and the second screen is the finished coarse aggregate; between the second screen and the third screen, between the third screen and the fourth screen The material is used as the finished coarse aggregate and/or the aggregate to be ground; the material between the fourth screen and the fifth screen is the aggregate to be ground, and the material below the fifth screen is -3mm material b;

Rod mill the aggregate to be rod milled to obtain -5mm material a.

Further, the mesh sizes of the first layer of screen, the second layer of screen, the third layer of screen, the fourth layer of screen and the fifth layer of screen are 31.5mm, 26mm, 10mm, 5mm and 3mm in sequence .

Further, the -3mm material b and -5mm material a are combined for slurry flotation to separate foam product e containing mica mixture and tailings slurry d; including:

The -3mm material b and -5mm material a are firstly stirred and slurried, then added with a pH regulator and a collector for flotation, and separated to obtain mica mixture foam concentrate e and tailings slurry d;

Dehydrating the tailings slurry d to obtain the finished product of machine-made sand f, including:

After the tailings slurry d is recovered and deslimed by sand washing, the finished machine-made sand f and muddy waste water are obtained;

After dehydrating the muddy wastewater, a filter cake g is obtained.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; also include:

The finished coarse aggregate is rod-milled to obtain -5mm material a.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; including:

Gyratory crushers, jaw crushers, cone crushers or impact crushers are used for raw material crushing, and -3mm material b obtained by wet screening after vertical shaft impact crusher shaping and -5mm material a is obtained by rod milling.

Further, the -3mm material b and -5mm material a are combined for slurry flotation to separate foam product e containing mica mixture and tailings slurry d; including:

The -3mm material b and -5mm material a first enter the mixer for mixing and mixing, add pH regulator and collector, and then flow into the flotation machine to float the mica mixture e; after flotation, the tailings slurry d enters Sand washing and fine sand recovery integrated machine processing, to obtain qualified finished machine-made sand f and mud cake g.

Further, after dehydrating the muddy wastewater, a filter cake g is obtained; including:

The muddy wastewater is sent to the thickener and filter press for dehydration and the obtained filter cake is stored, and the return water enters the clear water tank for reuse.

Further, the foam product e containing mica mixture is passed through wet strong magnetic separation, and magnetic separation obtains magnetic separation concentrate and magnetic separation tailings; including:

The foam product e containing the mica mixture is pumped into the strong magnetic high gradient magnetic separator for wet strong magnetic separation, and the magnetic separation concentrate and magnetic separation tailings are obtained by magnetic separation.

Compared with the prior art, the embodiment of the present invention has the following advantages and beneficial effects:

A wet method for removing mica in machine-made sand according to the embodiment of the present invention is to obtain -3mm material b and -5mm material a by crushing ore raw materials, vertical shaft impact crushing and shaping, screening and classification, and rod milling; Material b and -5mm material a are combined for slurry flotation and separated to obtain foam product e containing mica mixture and tailings slurry d; the foam product e containing mica mixture is subjected to wet strong magnetic separation to obtain magnetic separation concentrate ore and magnetic separation tailings; dehydration of magnetic separation concentrate to obtain biotite and lepidolite mixture h; dehydration of magnetic separation tailings to obtain muscovite and phlogopite mixture i. The foam product containing the mica mixture is subjected to wet strong magnetic separation, and the concentrate and tailings are obtained by magnetic separation and dehydrated to save, and a finished machine-made sand product with a mica content of less than 2% is obtained, which solves the problem of sand and gravel in the prior art. The mica is difficult to remove technical problems.

Description of drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic flow chart of a method for wet removal of mica in machine-made sand.

Fig. 2 is a schematic flow chart of an exemplary wet method for removing mica in machine-made sand.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "one embodiment," "an embodiment," "an example," or "example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, particular features, structures or characteristics may be combined in any suitable combination and/or subcombination in one or more embodiments or examples. Furthermore, those of ordinary skill in the art will appreciate that the drawings 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, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "higher", "lower", "inner ", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific Orientation, construction and operation in a particular orientation, therefore, should not be construed as limiting the scope of the invention.

Example

In order to solve the technical problem that the mica in the sand and gravel in the prior art is difficult to remove, the embodiment of the present invention provides a wet method for removing the mica in the machine-made sand, as shown in Figure 1, including: the first aspect, the embodiment of the present invention A wet method for removing mica in machine-made sand is provided, including:

S1. The ore raw materials are crushed, vertical shaft impact crushing and shaping, screening and classification, and rod milling to obtain -3mm material b and -5mm material a;

S2. Combining -3mm material b and -5mm material a into slurry flotation, and separating to obtain foam product e containing mica mixture and tailings slurry d;

S3. Pass the foam product e containing mica mixture through wet strong magnetic separation, and magnetic separation obtains magnetic separation concentrate and magnetic separation tailings;

S4. Dehydrating the magnetic separation concentrate to obtain a mixture h of biotite and lepidolite;

S5. Dehydrating the magnetic separation tailings to obtain a mixture i of muscovite and phlogopite;

S6. Dehydrating the tailings slurry d to obtain a finished product of qualified machine-made sand f.

In the embodiment of the present invention, -3mm material b and -5mm material a are obtained by crushing ore raw materials, vertical shaft impact crushing and shaping, screening and classification, and rod milling; the -3mm material b and -5mm material a are combined for slurry flotation, Separate the foam product e containing the mica mixture and the tailings slurry d; pass the foam product e containing the mica mixture through wet strong magnetic separation, and obtain magnetic separation concentrate and magnetic separation tailings by magnetic separation; dehydrate the magnetic separation concentrate Obtain biotite and lepidolite mixture h; dehydrate the magnetic separation tailings to obtain muscovite and phlogopite mixture i. The foam product containing the mica mixture is subjected to wet strong magnetic separation, and the concentrate and tailings are obtained by magnetic separation and dehydrated to save, and a finished machine-made sand product with a mica content of less than 2% is obtained, which solves the problem of sand and gravel in the prior art. The mica is difficult to remove technical problems.

Further, the mica content in the finished machine-made sand f is less than 2%.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; including:

The ore raw materials are crushed and shaped by vertical shaft impact crushing, and then the first stage of dry screening and the first stage of wet screening are carried out to obtain the finished coarse aggregate c and the aggregate to be rod-milled;

Wherein, the first stage of dry screening includes sequentially passing through the first layer of sieve and the second layer of sieve for dry sieving, and the second stage of wet sieving includes sequentially passing through the third layer of sieve, the fourth layer of The sieve and the fifth sieve are subjected to wet sieving, and the mesh sizes of the first sieve, the second sieve, the third sieve, the fourth sieve and the fifth sieve are successively reduced;

The material between the first screen and the second screen is the finished coarse aggregate; between the second screen and the third screen, between the third screen and the fourth screen The material is used as the finished coarse aggregate and/or the aggregate to be ground; the material between the fourth screen and the fifth screen is the aggregate to be ground, and the material below the fifth screen is -3mm material b;

Rod mill the aggregate to be rod milled to obtain -5mm material a.

Further, the mesh sizes of the first layer of screen, the second layer of screen, the third layer of screen, the fourth layer of screen and the fifth layer of screen are 31.5mm, 26mm, 10mm, 5mm and 3mm in sequence .

Further, the -3mm material b and -5mm material a are combined for slurry flotation to separate foam product e containing mica mixture and tailings slurry d; including:

The -3mm material b and -5mm material a are firstly stirred and slurried, then added with a pH regulator and a collector for flotation, and separated to obtain mica mixture foam concentrate e and tailings slurry d;

Dehydrating the tailings slurry d to obtain the finished product of machine-made sand f, including:

After the tailings slurry d is recovered and deslimed by sand washing, the finished machine-made sand f and muddy waste water are obtained;

After dehydrating the muddy wastewater, a filter cake g is obtained.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; also include:

The finished coarse aggregate is rod-milled to obtain -5mm material a.

Further, the ore raw materials are crushed, shaped by vertical shaft impact crushing, screened and graded, and rod milled to obtain -3mm material b and -5mm material a; including:

Gyratory crushers, jaw crushers, cone crushers or impact crushers are used for raw material crushing, and -3mm material b obtained by wet screening after vertical shaft impact crusher shaping and -5mm material a is obtained by rod milling.

Further, the -3mm material b and -5mm material a are combined for slurry flotation to separate foam product e containing mica mixture and tailings slurry d; including:

The -3mm material b and -5mm material a first enter the mixer for mixing and mixing, add pH regulator and collector, and then flow into the flotation machine to float the mica mixture e; after flotation, the tailings slurry d enters Sand washing and fine sand recovery integrated machine processing, to obtain qualified finished machine-made sand f and mud cake g.

Further, after dehydrating the muddy wastewater, a filter cake g is obtained; including:

The muddy wastewater is sent to the thickener and filter press for dehydration and the obtained filter cake is stored, and the return water enters the clear water tank for reuse.

Further, the foam product e containing mica mixture is passed through wet strong magnetic separation, and magnetic separation obtains magnetic separation concentrate and magnetic separation tailings; including:

The foam product e containing the mica mixture is pumped into the strong magnetic high gradient magnetic separator for wet strong magnetic separation, and the magnetic separation concentrate and magnetic separation tailings are obtained by magnetic separation.

For example, refer to FIG. 2 . The method includes: using a gyratory (or jaw crusher) or a cone crusher for crushing, vertical shaft impact crushing for shaping, rod milling for machine-made sand, and -3mm material obtained by wet screening after shaping and crushing and -5mm product obtained by rod milling. , before entering the all-in-one machine for sand washing and fine sand recovery, the slurry is mixed and foaming agent is added, and the mixture of muscovite, biotite, sericite and other mica in the machine-made sand is selected by flotation by using the flotability of mica, After flotation, the pulp enters the subsequent integrated sand washing and fine sand recycling machine and sewage treatment system to obtain qualified finished machine-made sand and mud cake; the foam product obtained by flotation enters the wet strong magnetic process, and contains lithium through biotite. And it has the principle of weak magnetism. The lepidolite in it is selected by wet strong magnetic separation, and the concentrate obtained by magnetic separation is lithium concentrate. The tailings of the concentrate are dehydrated and stockpiled. The specific production process is as follows: the material after vertical shaft crushing is screened in two stages, and the second stage is wet screening, with three layers of screens of 10mm, 5mm, and 3mm. After screening, materials >10mm and 5-10mm can be used as finished products Coarse aggregate can also enter the rod mill together with 3-5mm material to make sand, and the <3mm material and the -5mm material obtained by rod mill are machine-made sand containing mica. The material first enters the mixer for stirring and slurry mixing, then adds foaming agent, and then enters the flotation machine by gravity, and the selected foam is the mica mixture. After flotation, the ore pulp enters the sand washing and fine sand recovery integrated machine for desliming, and the qualified finished machine-made sand is obtained. The sewage enters the thickener and filter press for dehydration, and the obtained filter cake is stored, and the return water enters the clear water tank for reuse. The flotation foam product is pumped into the strong magnetic high gradient magnetic separator for wet magnetic separation. The selected concentrate is lepidolite. Stockpile. Taking the above measures, due to the good floatability of mica, the required dosage of flotation chemicals is small, and the yield of the selected foam products is low, which can ensure the output of machine-made sand products, and effectively reduce the content of mica in the finished sand, so that it meets the specifications. Exceeding the requirement of 2%, the qualified machine-made sand is produced, which greatly increases the market competitiveness of the machine-made sand. At the same time, the lithium-containing characteristics of biotite are used to select lithium concentrate, which can be sold separately to improve the economic benefits of the project.

The production process of the embodiment of the present invention is simple, reliable, high sorting efficiency, wide application range, large processing capacity, etc., can significantly reduce the mica content in the machine-made sand, and produce qualified machine-made sand products to meet the Requirements of national standards and industry standards. At the same time, the selected mica can be comprehensively utilized, and the added value of the selected lithium concentrate is very high, which can improve the comprehensive economic benefits of the project. Especially when the mica content in the raw ore is very high, this production process has greater advantages in improving the quality of machine-made sand products and increasing the comprehensive economic benefits of the project.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (10)

1. A method for wet removing mica from machine-made sand, comprising:

crushing ore raw materials, performing vertical shaft impact crushing, shaping, screening, classifying and rod grinding to obtain a material b with the diameter of-3 mm and a material a with the diameter of-5 mm;

mixing and floating a material b with the thickness of-3 mm and a material a with the thickness of-5 mm, and separating to obtain a foam product e containing a mica mixture and tailing pulp d;

carrying out wet strong magnetic separation on the foam product e containing the mica mixture to obtain magnetic concentrate and magnetic tailings;

dehydrating the magnetic concentrate to obtain a biotite and lepidolite mixture h;

dewatering the magnetic separation tailings to obtain a muscovite and phlogopite mixture i;

and dehydrating the tailing pulp d to obtain a finished product of the machine-made sand f.

2. A method of wet removing mica from machine-made sand as in claim 1 wherein said machine-made sand f finished product has a mica content of less than 2%.

3. The method for removing mica in machine-made sand by a wet method according to claim 1, wherein ore raw materials are crushed, shaped by a vertical shaft impact, classified by screening and rod-milled to obtain a material b with the diameter of-3 mm and a material a with the diameter of-5 mm; comprising the following steps:

crushing ore raw materials, performing first-stage dry screening and first-stage wet screening after vertical shaft impact crushing and shaping to obtain a finished coarse aggregate c and a to-be-rod-milled aggregate;

the first section dry screening comprises dry screening through a first layer of screen mesh and a second layer of screen mesh in sequence, the second section wet screening comprises wet screening through a third layer of screen mesh, a fourth layer of screen mesh and a fifth layer of screen mesh in sequence, and the mesh sizes of the first layer of screen mesh, the second layer of screen mesh, the third layer of screen mesh, the fourth layer of screen mesh and the fifth layer of screen mesh are reduced in sequence;

the material between the first layer of screen mesh and the second layer of screen mesh is finished coarse aggregate; the materials between the second layer of screen mesh and the third layer of screen mesh and between the third layer of screen mesh and the fourth layer of screen mesh are used as finished coarse aggregate and/or aggregate to be rod ground; the materials between the fourth layer of screen cloth and the fifth layer of screen cloth are to-be-rod-ground aggregate, and the materials below the fifth layer of screen cloth are-3 mm materials b;

and (5) performing rod milling on the aggregate to be rod milled to obtain a material a with the diameter of-5 mm.

4. A method of wet removing mica from machine-made sand as in claim 2 wherein said first, second, third, fourth and fifth layers of screens have mesh sizes of 31.5mm, 26mm, 10mm, 5mm and 3mm in that order.

5. The method for removing mica in machine-made sand by a wet method according to claim 1, wherein-3 mm material b and-5 mm material a are combined for size mixing floatation, and a foam product e containing a mica mixture and tailing pulp d are obtained by separation; comprising the following steps:

firstly stirring and pulping a material b with the diameter of-3 mm and a material a with the diameter of-5 mm, then adding a pH regulator and a collector for floatation, and separating to obtain mica mixture foam concentrate e and tailing pulp d;

dehydrating the tailing pulp d to obtain a finished product of machine-made sand f, which comprises the following steps:

the tailing pulp d is subjected to sand washing, recycling and desliming treatment to obtain finished products of machine-made sand f and mud-containing wastewater;

and dehydrating the mud-containing wastewater to obtain a filter cake g.

6. A method for wet removal of mica from machine-made sand as claimed in claim 3, wherein ore raw materials are crushed, shaped by vertical shaft impact, classified by screening and rod-milled to obtain-3 mm material b and-5 mm material a; further comprises:

and (5) performing rod milling on the finished coarse aggregate to obtain a material a with the diameter of-5 mm.

7. The method for removing mica in machine-made sand by a wet method according to claim 1, wherein ore raw materials are crushed, shaped by a vertical shaft impact, classified by screening and rod-milled to obtain a material b with the diameter of-3 mm and a material a with the diameter of-5 mm; comprising the following steps:

crushing raw materials by adopting a gyratory crusher, a jaw crusher, a cone crusher, a reaction crusher or the like, shaping by adopting a vertical shaft impact crusher, and obtaining a material b with the diameter of-3 mm and a material a with the diameter of-5 mm by adopting wet screening.

8. The method for removing mica in machine-made sand by wet method according to claim 5, wherein-3 mm material b and-5 mm material a are combined, mixed, floated and separated to obtain a foam product e containing mica mixture and tailing pulp d; comprising the following steps:

stirring and pulping a material b with the diameter of-3 mm and a material a with the diameter of-5 mm in a stirrer, adding a pH regulator and a collector, and automatically flowing into a flotation machine to float a mica mixture e; and (3) the tailings slurry d after flotation enters a sand washing fine sand recycling integrated machine for treatment, so that qualified finished product machine-made sand f and mud cake g are obtained.

9. The method for wet-process removal of mica from machine-made sand according to claim 5, wherein cake g is obtained after dehydration of the sludge-containing wastewater; comprising the following steps:

and (3) delivering the mud-containing wastewater into a thickener and a filter press for dehydration, piling up the obtained filter cake, and delivering backwater into a clean water tank for recycling.

10. The method for removing mica in machine-made sand by a wet method according to claim 2, wherein the foam product e containing the mica mixture is subjected to wet strong magnetic separation to obtain magnetic separation concentrate and magnetic separation tailings; comprising the following steps:

and feeding the foam product e containing the mica mixture into a strong-magnetic high-gradient magnetic separator through a pump to carry out wet-type strong magnetic separation, and obtaining magnetic concentrate and magnetic tailings through magnetic separation.

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