阅读说明：本技术 一种基于低品质矿物废渣制备复合掺合料的工艺 (Process for preparing composite admixture based on low-quality mineral waste residues ) 是由 宋军伟 郭慧 段先辉 刘方华 黎军 刘轩 刘洋 杨航 于 2021-10-15 设计创作，主要内容包括：本发明提出一种基于低品质矿物废渣制备复合掺和料的工艺,该工艺包括如下步骤：通过粉磨机将矿物废渣粉磨,得到矿渣粉,矿渣粉的比表面积在400m～(2)/kg以上；通过高压风机抽吸粉磨机内的矿渣粉,并将矿渣粉排入选粉机,通过对矿渣粉进行分级,得到第一矿渣粉和第二矿渣粉；通过输送装置将步骤二制得的第一矿渣粉和第二矿渣粉输送至预混装置中进行混合,得到预混料；将废旧橡胶先经粉碎机粉碎再通过粉磨机粉磨,制得橡胶粉,将橡胶粉、纳米二氧化钛以及步骤三得到的预混料放入搅拌机中进行搅拌,制得掺和料。本发明能够对不同粒度的矿渣粉进行分别处理,以实现高效利用矿渣粉。(The invention provides a process for preparing a composite admixture based on low-quality mineral waste residues, which comprises the following steps: grinding the mineral waste residue by a grinding machine to obtain slag powder, wherein the specific surface area of the slag powder is 400m 2 More than kg; the method comprises the following steps of (1) sucking slag powder in a grinding mill through a high-pressure fan, discharging the slag powder into a powder concentrator, and grading the slag powder to obtain first slag powder and second slag powder; conveying the first slag powder and the second slag powder prepared in the second step to a premixing device through a conveying device for mixing to obtain a premix; and (3) crushing the waste rubber by a crusher, then grinding by a grinding machine to obtain rubber powder, and stirring the rubber powder, the nano titanium dioxide and the premix obtained in the step three in a stirrer to obtain the admixture. The invention can respectively treat the slag powder with different granularities so as to realize the high-efficiency utilization of the slag powder.)

1. A process for preparing a composite admixture based on low-quality mineral waste residues is characterized by comprising the following steps:

grinding the mineral waste residue through a grinding machine (10) to obtain mineral residue powder; wherein the specific surface area of the slag powder is more than 400m²Per kg, the percent of residue on sieve of 50 μm is 5%;

pumping the slag powder in the pulverizer (10) through a high-pressure fan (50), discharging the slag powder obtained in the first step into a powder concentrator (20), and grading the slag powder to obtain first slag powder and second slag powder; wherein the particle size of the first slag powder is 28-45 μm, and the particle size of the second slag powder is 20-27 μm;

step three, conveying the first slag powder and the second slag powder prepared in the step two to a premixing device (40) through a conveying device (30) for mixing to obtain a premix;

and step four, crushing the waste rubber by a crusher, then grinding by a grinding machine (10) to prepare rubber powder, and putting the rubber powder, the nano titanium dioxide and the premix obtained in the step three into a stirrer (60) for stirring to prepare the admixture.

2. The process for preparing the composite admixture based on the low-quality mineral waste residue as claimed in claim 1, wherein the powder concentrator (20) comprises an inner spiral shell (21) connected with the discharge end of the high-pressure fan (50), and an outer spiral shell (22) sleeved on the outer surface of the inner spiral shell (21).

3. The process for preparing a composite admixture based on low quality mineral waste residue as claimed in claim 2, wherein the conveyor means (30) comprises a first inclined auger (32) connected to the discharge end of the inner cyclone shell (21) and a second inclined auger (31) connected to the discharge end of the outer cyclone shell (22).

4. A process for preparing a composite admixture based on low quality mineral waste residue as claimed in claim 3, wherein said premixing device (40) comprises a mixing box (41) connected to the discharge end of said conveying device (30), a dosing assembly (42) provided at the top end of the interior of said mixing box (41), and a premixing assembly (43) provided at the bottom end of the interior of said mixing box (41).

5. The process for preparing a composite admixture based on low-quality mineral waste residue as claimed in claim 4, wherein the quantitative feeding assembly (42) comprises a material guide plate (421) fixed inside the mixing box (41), a rotating shaft (422) provided at one end of the material guide plate (421) and rotatably connected with the inner wall of the mixing box (41) through a bearing, and a plurality of material receiving plates (423) fixed on the outer surface of the rotating shaft (422).

6. The process for preparing a composite admixture based on low-quality mineral waste residue as claimed in claim 5, wherein the quantitative feeding assembly (42) further comprises a weight sensor (424) provided on the lower surface of the guide plate (421).

7. The process for preparing the composite admixture based on the low-quality mineral waste residue as claimed in claim 6, wherein the premixing assembly (43) comprises a partition plate mechanism (431) arranged at the inner bottom end of the mixing box (41), and conveying augers (433) arranged at both sides of the partition plate mechanism (431).

8. The process for preparing the composite admixture based on the low-quality mineral waste residue as claimed in claim 7, wherein the partition plate mechanism (431) comprises a partition plate frame (4311) fixed at the bottom end of the interior of the mixing box (41), and a partition plate (4312) inserted at the top end of the partition plate frame (4311).

9. The process for preparing the composite admixture based on the low-quality mineral waste residue as claimed in claim 8, wherein a winding mechanism (432) is connected to the driving end of the partition plate mechanism (431), the winding mechanism (432) comprises a steel wire rope (4321) fixed to the upper surface of the partition plate (4312), and one end of the steel wire rope (4321) far away from the partition plate (4312) extends to the outside and is connected with a winch (4322).

10. The process for preparing the composite admixture based on the low-quality mineral waste residue as claimed in claim 4, wherein a first discharging pipe (411) is fixed on one side surface of the mixing box (41) and is symmetrically arranged, a second discharging pipe (412) is fixed on one side surface of the mixing box (41) far away from the first discharging pipe (411), the discharging end of the first discharging pipe (411) is connected with the feeding end of the stirring mill (60), the discharging end of the second discharging pipe (412) is connected with a third inclined packing auger (413), and the discharging end of the third inclined packing auger (413) is connected with the feeding end of the pulverizer (10).

Technical Field

The invention relates to the technical field of building material preparation, in particular to a process for preparing a composite admixture based on low-quality mineral waste residues.

Background

Mineral admixtures are an important building material in the field of civil engineering construction. Specifically, the mineral admixture is inorganic mineral fine powder which is added during concrete preparation and can improve the performance of fresh concrete and hardened concrete.

The prior patent (application number: 201911143435.0) proposes a composite mineral blend and a preparation method thereof, wherein the preparation method comprises the following components in percentage by weight: 40-60% of steel slag powder, 30-45% of iron tailing micro powder, 5-20% of slag powder, 0-5% of desulfurized ash slag and 0-5% of desulfurized gypsum/phosphogypsum. The composite mineral admixture provided by the invention mixes the steel slag powder, the iron tailing micro powder and the slag powder according to a specific proportion, fully utilizes the calcium-based component in the steel slag powder to fully react with the iron tailing micro powder or the active silicon-aluminum material in the slag powder which is activated by mechanochemistry, so as to improve the reaction activity of the composite mineral admixture and the dense filling effect of the matching of step granularity, and the comprehensive proportion of the steel slag powder and the iron tailing micro powder is more than 70%, so that the steel slag and the iron tailings are utilized to a greater extent.

However, the above configuration method still has drawbacks: for example, although the above preparation method can improve the reactivity of the composite mineral admixture and the dense filling effect of the matching of the step particle size, the above preparation method cannot separately process and match the mineral slag with different particle sizes, thereby affecting the compactness of the prepared admixture.

Disclosure of Invention

Based on the above, the present invention aims to provide a process for preparing a composite admixture based on low-quality mineral waste residues, so as to solve the technical problems in the background art.

The invention provides a process for preparing a composite admixture based on low-quality mineral waste residues, which comprises the following steps:

grinding the mineral waste residue through a grinding machine to obtain mineral residue powder: wherein the specific surface area of the slag powder is more than 400m²Per kg, the percent of residue on sieve of 50 μm is 5%;

pumping the slag powder in the grinding machine by a high-pressure fan, discharging the slag powder obtained in the step one into a powder concentrator, and grading the slag powder to obtain first slag powder and second slag powder; wherein the particle size of the first slag powder is 28-45 μm, and the particle size of the second slag powder is 20-27 μm;

step three, conveying the first slag powder and the second slag powder prepared in the step two to a premixing device through a conveying device for mixing to obtain a premix;

and step four, crushing the waste rubber by a crusher, then grinding by a grinding machine to prepare rubber powder, and putting the rubber powder, the nano titanium dioxide and the premix obtained in the step three into a stirrer for stirring to prepare the admixture.

Furthermore, the powder concentrator comprises an internal rotation shell connected with the discharge end of the high-pressure fan, and an external rotation shell sleeved on the outer surface of the internal rotation shell. In the invention, the slag powder is sorted by the powder concentrator so that the first, heavier slag powder falls into the outer spiral shell and the second, lighter slag powder falls into the inner spiral shell.

Further, conveyor include with the first oblique auger that the discharge end of interior spiral shell is connected, and with the oblique auger of second that the discharge end of outer spiral shell is connected. In the invention, the first slag powder is conveyed to the mixing box through the first inclined packing auger, and the second slag powder is conveyed to the mixing box through the second inclined packing auger.

Furthermore, the premixing device comprises a mixing box connected with the discharge end of the conveying device, a quantitative feeding assembly arranged at the top end inside the mixing box, and a premixing assembly arranged at the bottom end inside the mixing box. In the invention, the quantitative feeding component is used for controlling the amount of the first slag powder premixed in the premixing component so as to adjust the proportion of the slag powder with different particle sizes.

Furthermore, the quantitative feeding assembly comprises a material guide plate fixed inside the mixing box, a rotating shaft arranged at one end of the material guide plate and rotatably connected with the inner wall of the mixing box through a bearing, and a plurality of material bearing plates fixed on the outer surface of the rotating shaft. In the invention, the material is driven to fall into the premixing component through the material bearing plate for premixing, and when the rotating shaft stops driving the material bearing plate to rotate, the material is blocked by the material bearing plate from further falling.

Furthermore, the quantitative feeding assembly further comprises a weight sensor arranged on the lower surface of the material guide plate. In the invention, the electronic signal with the material weight information is transmitted to the PLC connected with the weight sensor for judgment, so that the weight of the materials stacked on the guide plate exceeds the standard, and the redundant parts are discharged through the premixing component.

Furthermore, the premixing assembly comprises a partition plate mechanism arranged at the bottom end inside the mixing box and conveying augers arranged on two sides of the partition plate mechanism. In the invention, the discharge directions of the first slag powder and the second slag powder are controlled by the forward rotation and the reverse rotation of the conveying auger.

Furthermore, baffle mechanism is including being fixed in the baffle frame of the inside bottom of mixing box to and alternate in the division board on baffle frame top. In the invention, the size of the opening of the partition plate frame is controlled by lifting the partition plate in the partition plate frame, so that whether the materials in two spaces formed by separating the mixing boxes by the partition plate are mixed or not is controlled.

Furthermore, the driving end of the partition plate mechanism is connected with a winding mechanism, the winding mechanism comprises a steel wire rope fixed on the upper surface of the partition plate, and one end, far away from the partition plate, of the steel wire rope extends to the outside and is connected with a winch. In the invention, the winch drives the steel wire rope to perform rope winding and rope unwinding actions so as to control the lifting of the partition plate connected with the steel wire rope.

Further, a first discharging pipe is symmetrically arranged on the surface of one side of the mixing box, a second discharging pipe is arranged on the surface of one side, away from the first discharging pipe, of the mixing box, the discharging end of the first discharging pipe is connected with the feeding end of the stirring machine, the discharging end of the second discharging pipe is connected with a third inclined auger, and the discharging end of the third inclined auger is connected with the feeding end of the flour mill. In the invention, the two conveying augers rotate simultaneously until the mixed first slag powder and the mixed second slag powder are pushed into the second discharge pipe, and then the mixed mixture is discharged into the stirrer through the second discharge pipe communicated with the stirrer.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the process can respectively treat the slag powder with different granularities so as to achieve the purpose of efficiently utilizing the slag powder. The method specifically comprises the following steps: pumping the slag powder in the pulverizer by a high-pressure fan, and discharging the obtained slag powder into a powder concentrator; through carrying out the grading in order to obtain first slag powder and second slag powder to slag powder, get into the first slag powder of compounding case bottom space through ration feeding subassembly control to the mixing proportion that first slag powder and second slag powder correspond is controlled.

Secondly, the process can carry out targeted treatment aiming at the proportion of the first slag powder and the second slag powder so as to adjust the proportion of the first slag powder and the second slag powder. The method specifically comprises the following steps: dividing the bottom space of the mixing box through a partition plate mechanism so that one of the mixing box processes first slag powder and the other mixing box processes second slag powder; the discharge directions of the first slag powder and the second slag powder are controlled by the forward rotation and the reverse rotation of the conveying auger; when the first slag powder is discharged into the pulverizer, the first slag powder is reprocessed.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention as set forth above.

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic view of the overall structure of a device for preparing a composite admixture based on low-quality mineral waste residues, which is proposed by the present invention;

FIG. 2 is a top view of the apparatus for preparing a composite admixture based on low-quality mineral waste residues according to the present invention;

FIG. 3 is an isometric view of an apparatus for preparing a composite admixture based on low quality mineral waste residue in accordance with the present invention;

FIG. 4 is a schematic structural view of a powder concentrator in the apparatus for preparing a composite admixture based on low-quality mineral waste residues, according to the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 2;

FIG. 8 is a side view of the apparatus for preparing a composite admixture based on low-quality mineral waste residue according to the present invention.

Description of the main symbols:

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 8, the present invention provides a process for preparing a composite admixture based on low-quality mineral waste residues, which comprises the following steps:

grinding the mineral waste residue through a pulverizer 10 to obtain mineral residue powder; wherein the specific surface area of the slag powder is more than 400m²The percentage of residue on the sieve at 50 μm was 5% per kg.

Secondly, sucking the slag powder in the pulverizer 10 through a high-pressure fan 50, discharging the slag powder obtained in the first step into a powder concentrator 20, and grading the slag powder to obtain first slag powder and second slag powder; the particle size of the first slag powder is 28-45 mu m, and the particle size of the second slag powder is 20-27A.

And step three, conveying the first slag powder and the second slag powder prepared in the step two to a premixing device 40 through a conveying device 30 for mixing to obtain a premix.

And step four, crushing the waste rubber by a crusher, then grinding by a grinding machine 10 to prepare rubber powder, and putting the rubber powder, the nano titanium dioxide and the premix obtained in the step three into a stirrer 60 for stirring to prepare the admixture.

Specifically, please refer to fig. 1, fig. 2 and fig. 3, the powder concentrator 20 includes an inner rotary shell 21 connected to a discharge end of the high pressure fan 50, and an outer rotary shell 22 sleeved on an outer surface of the inner rotary shell 21. The conveying device 30 comprises a first inclined packing auger 32 connected with the discharge end of the inner rotary shell 21 and a second inclined packing auger 31 connected with the discharge end of the outer rotary shell 22.

It should be noted that in the present embodiment, the slag powder is sorted by the powder concentrator 20, so that the first, heavier slag powder falls into the outer spiral shell 22, and the second, lighter slag powder falls into the inner spiral shell 21.

Further, the first slag powder is conveyed to the mixing box 41 through the first inclined auger 32, and the second slag powder is conveyed to the mixing box 41 through the second inclined auger 31.

Specifically, referring to fig. 1, 4 and 5, the premixing device 40 includes a mixing box 41 connected to the discharge end of the conveying device 30, a quantitative feeding assembly 42 disposed at the top end of the mixing box 41, and a premixing assembly 43 disposed at the bottom end of the mixing box 41.

The quantitative feeding assembly 42 includes a material guiding plate 421 fixed inside the material mixing box 41, a rotating shaft 422 provided at one end of the material guiding plate 421 and rotatably connected to an inner wall of the material mixing box 41 through a bearing, and a plurality of material receiving plates 423 fixed to an outer surface of the rotating shaft 422. Meanwhile, the quantitative feeding assembly 42 further includes a weight sensor 424 disposed on a lower surface of the material guide plate 421.

It should be noted that, in this embodiment, the first slag powder and the second slag powder are received by the mixing box 41, and the amount of the first slag powder premixed in the premixing assembly 43 is controlled by the quantitative feeding assembly 42, so as to adjust the ratio of the slag powders with different particle sizes.

Further, the guide plate 421 guides the first slag powder to slide down to the vicinity of the rotating shaft 422, the rotating shaft 422 drives the material bearing plate 423 to rotate, so as to drive the material to fall into the premixing component 43 for premixing through the material bearing plate 423, and when the rotating shaft 422 stops driving the material bearing plate 423 to rotate, the material is blocked by the material bearing plate 423 from further falling down.

Further, the weight sensor 424 with the model HW2-50 senses the weight of the material stacked on the material guide plate 421, and transmits an electronic signal with the weight information of the material to the PLC controller connected to the weight sensor 424 for judgment, so that when the weight of the material stacked on the material guide plate 421 exceeds the standard, the surplus part is discharged through the premixing assembly 43.

Specifically, referring to fig. 1, fig. 4 and fig. 5, the premixing assembly 43 includes a partition mechanism 431 disposed at the bottom end of the mixing box 41, and conveying augers 433 disposed at two sides of the partition mechanism 431.

Specifically, the partition mechanism 431 includes a partition frame 4311 fixed to the bottom end inside the mixing box 41, and a partition plate 4312 inserted into the top end of the partition frame 4311, and a driving end of the partition mechanism 431 is connected to the winding mechanism 432.

The winding mechanism 432 is fixed on a steel wire rope 4321 on the upper surface of the partition plate 4312, the steel wire rope 4321 is far away from one end of the partition plate 4312 and extends to the outside to be connected with the winch 4322, a first discharge pipe 411 is symmetrically arranged on the surface of one side of the mixing box 41, a second discharge pipe 412 is fixed on the surface of one side of the mixing box 41 far away from the first discharge pipe 411, the discharge end of the first discharge pipe 411 is connected with the feed end of the stirrer 60, the discharge end of the second discharge pipe 412 is connected with a third inclined packing auger 413, and the discharge end of the third inclined packing auger 413 is connected with the feed end of the pulverizer 10.

It should be noted that, in this embodiment, the bottom space of the mixing box 41 is divided by the partition mechanism 431, so that one of them processes the first slag powder and the other processes the second slag powder. In practical application, the discharge directions of the first slag powder and the second slag powder are controlled by the forward rotation and the reverse rotation of the conveying auger 433.

Furthermore, the size of the opening of the partition plate 4311 is controlled by the lifting of the partition plate 4312 in the partition plate 4311, so as to control whether the materials in the two spaces formed by the partition plate 4312 separating the mixing box 41 are mixed or not.

Further, the winch 4322 drives the steel wire rope 4321 to perform rope winding and rope unwinding to control the lifting and lowering of the partition plate 4312 connected to the steel wire rope 4321, and pulleys abutting against the steel wire rope 4321 are disposed on both sides of the mixing box 41 to prevent dry friction between the steel wire rope 4321 and the mixing box 41.

Further, two carry auger 433 to rotate simultaneously, until first slag powder and the second slag powder after the mixture all pushed the inside back of second discharging pipe 412, discharge the mixture after the mixture into mixer 60 through the second discharging pipe 412 that is linked together with mixer 60, further mix the mixture after to through mixer 60, when the inside transport auger 433 that is close to rotation axis 422 one end of mixing box 41 reverses, carry first slag powder to the oblique auger 413 of third through second discharging pipe 412, so that first slag powder gets into pulverizer 10 and grinds again.

The specific operation mode of the invention is as follows:

when preparing the admixture, firstly, the mineral waste residue is ground by a grinding machine 10 to obtain the slag powder, and the specific surface area of the slag powder is 400m²More than kg;

the slag powder in the pulverizer 10 is sucked by a high pressure fan 50, and the obtained slag powder is discharged into a powder concentrator 20, and the slag powder is classified to obtain a first slag powder and a second slag powder;

conveying the prepared first slag powder and second slag powder to a premixing device 40 through a conveying device 30 to be mixed to obtain a premix;

and (3) crushing the waste rubber by a crusher, then grinding by a grinding machine 10 to prepare rubber powder, and putting the rubber powder, the nano titanium dioxide and the premix obtained in the step three into a stirrer 60 for stirring to prepare the admixture.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.