CN110981296A

CN110981296A - Pressing method brick making process for building waste mud

Info

Publication number: CN110981296A
Application number: CN201911188918.2A
Authority: CN
Inventors: 王建军; 刘涛; 胡宝山; 仲建; 李家红
Original assignee: SHANGHAI ZHIPING FOUNDATION ENGINEERING CO LTD
Current assignee: SHANGHAI ZHIPING FOUNDATION ENGINEERING CO LTD
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-04-10

Abstract

The embodiment of the invention discloses a pressing method brick making process for building waste mud, which comprises the following steps: s100: carrying out sand separation and washing treatment on the building slurry to obtain desanded slurry; s200: adding a flocculating agent into the desanded slurry, quickly stirring until tiny solid particles in the slurry are coagulated into flocculent lumps with larger volume, standing, and removing supernatant; s300: dehydrating the flocculated slurry to obtain a dehydrated mud cake with the water content of less than or equal to 35%; s400: the materials are prepared according to the following material mass percentages: 80-90% of dewatered mud cake, 12-17% of cement and 2-3% of water reducing agent; s500: adding water into the ingredients, and stirring to obtain a brick making raw material; s600: and pressing the brick making raw materials to obtain a finished product brick. The brick making process of the building waste mud can reduce the treatment cost of the waste mud, solve the problem of environmental pollution caused by the waste mud and realize the recycling value of the waste mud.

Description

Pressing method brick making process for building waste mud

Technical Field

The embodiment of the invention relates to the field of brick making, in particular to a pressing method brick making process for building waste mud.

Background

A large amount of clay bricks are used as wall materials in the traditional construction industry, and the production of the clay bricks certainly damages farmlands, consumes farmland land resources and seriously damages ecological balance. Clay bricks are prohibited in all cities in the country in 2010, so that bricks made of clay raw materials instead of traditional clay raw materials must be found.

With the continuous development of the building industry, a large amount of waste slurry can be generated in the building construction process, including sand, bentonite and a large amount of water, the existing treatment mode is to load and transport the waste slurry on a tank handle spot, and thus, a plurality of problems can be generated: the amount of waste slurry generated in building construction is huge, the loading and outward transportation cost is high, and the efficiency is low; the slurry spills and leaks to pollute the environment in the transportation process; the mud is discarded at will and buried to cause greater pollution.

The inventor of the application finds that in the prior art, after the water content of the building waste mud is lower than 60%, the main treatment mode is still landfill, the treatment cost is high, the occupied area of a construction site is large, and the efficiency is low.

Disclosure of Invention

The embodiment of the invention provides a pressing method brick making process for building waste mud, which is used for making bricks from the building waste mud, has simple process, greatly reduces the expense of the treatment cost of the building waste mud, can replace the traditional clay brick to be used as a building wall material, and achieves the effect of recycling waste.

The embodiment of the invention provides a pressing method brick making process for building waste mud, which comprises the following steps:

s100: carrying out sand separation and washing treatment on the building slurry to obtain desanded slurry;

s200: adding a flocculating agent into the desanded slurry, quickly stirring until tiny solid particles in the slurry are coagulated into flocculent lumps with larger volume, standing, and removing supernatant;

s300: dehydrating the flocculated slurry to obtain a dehydrated mud cake with the water content of less than or equal to 35%;

s400: the materials are prepared according to the following material mass percentages:

80 to 90 percent of dehydrated mud cake

12 to 17 percent of cement

2 to 3 percent of water reducing agent;

s500: adding water into the ingredients, stirring, wherein the added water accounts for 6-12% of the total mass percent, and uniformly stirring to obtain a brick making raw material;

s600: and pressing the brick making raw materials to obtain a finished product brick.

In one possible embodiment, the construction mud comprises sand and bentonite, and the water content of the construction mud is greater than or equal to 80%.

In a possible scheme, the flocculating agent in the S200 comprises polyacrylamide (anions) and quicklime, and is added according to the ratio of 1-1.1g/L of polyacrylamide (anions) to 10g/L of quicklime.

In a possible solution, the step S300 specifically includes the following steps:

s310: conveying the flocculent agglomerate slurry to a belt filter press for gravity dehydration;

s320: the slurry after gravity dehydration is sent to a wedge-shaped section of a belt filter press for prepressing and dehydration;

s330: delivering the slurry subjected to prepressing and dehydration to a pressure dehydration area of a belt type filter press for filter pressing and dehydration;

s340: and (3) detecting the water content of the slurry subjected to filter pressing and dewatering, repeating the step S300 if the water content is more than 35% in the detection result, and obtaining a dewatered mud cake with the water content of less than or equal to 35% in the detection result.

In one possible embodiment, the water reducing agent is a water reducing agent having a water reduction rate of greater than or equal to 15%.

In a possible scheme, in the step S500, the stirring time is 5-10min, and the stirring speed is 60-200 r/min.

In a possible scheme, the S600 specifically includes the following steps:

s610: weighing the brick making raw materials to obtain the brick making raw materials with equal weight;

s620: conveying the brick making raw materials with equal weight to a pressure brick making machine, pressing into brick culture, and placing on a brick containing plate;

s630: and conveying the brick containing plate to a curing room for curing to obtain a finished brick.

In one feasible scheme, the curing chamber has the temperature of 10-30 ℃, the humidity of 70-90% and the curing time of 10-15 days.

Based on the scheme, the sand and stone particles in the waste slurry are removed through sand separating and washing equipment, then the flocculating agent is added, the mixture is rapidly stirred until the tiny solid particles in the slurry are coagulated into flocculent lumps with larger volume, the flocculent lumps are stood, the supernatant liquid is removed, the remaining slurry is pumped to a belt filter press to be subjected to filter pressing and dehydration to obtain a dehydrated mud cake with the water content of less than or equal to 35 percent, the dehydrated mud cake, the cement and the water reducing agent are added with water and stirred to be uniformly stirred to obtain a brick making raw material, and the brick making raw material is sent to a pressure brick making machine to be pressed into bricks for culture, so that the finished brick is finally obtained. The invention recycles the building waste mud through the process, thereby not only reducing the cost of waste mud treatment, but also realizing economic benefit of the waste mud. The pressed brick can be used in different places according to different requirements, including but not limited to brick laying, permeable brick, water conservancy revetment and landscape decoration.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a block diagram of a process flow in an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication connection; either directly or indirectly through intervening media, either internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The technical solution of the present invention will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments

Fig. 1 is a process flow diagram in an embodiment of the present invention, and as shown in fig. 1, the process for making bricks by using building waste mud through a pressing method in the embodiment includes the following steps:

specifically, the building slurry in step S100 includes drilling pile foundation construction slurry, underground wall continuous construction slurry, slurry shield construction slurry or trenchless construction slurry; the sand separating and washing treatment refers to washing the building slurry by using a sand washing machine to remove sand and stone in the building slurry to obtain desanded slurry, and discharging the slurry to a desanding pool; the sandstone is a non-adhesive material, and the durability of the finished brick can be improved by removing the sandstone.

specifically, in this embodiment, the slurry in the desanding pool is pumped to the flocculation pool, the pumping is stopped when the slurry reaches 80% of the volume of the flocculation pool, the flocculant is added into the flocculation pool, the slurry is rapidly stirred, the flocculant can be added and stirred simultaneously, the coagulation effect is prevented from being influenced by the coagulation of the flocculant, and after the slurry is coagulated into flocculent lumps, the slurry is left for 20-30min, and the supernatant is removed; a plurality of flocculation ponds can be arranged, so that the construction can be continuously carried out; a plurality of slurry pumps can also be added in the middle of the flocculation tank for stirring, so that the flocculation effect is accelerated; the flocculent agglomerates refer to the state in which the fine particles in the slurry are agglomerated together.

specifically, the obtained flocculent block-shaped slurry is sent to a belt filter press, the slurry is repeatedly subjected to filter pressing and dehydration, and the water content of the obtained dehydrated mud cake is ensured to be less than or equal to 35% through detection; the plasticity of the brick can be influenced by the water content of the brick making raw materials, the shrinkage rate of the finished brick is influenced, the drying time of the brick is indirectly influenced by the shrinkage rate, and if the brick is dried too fast, the brick body is easy to crack, and the product quality is influenced.

80 to 90 percent of dehydrated mud cake

12 to 17 percent of cement

2 to 3 percent of water reducing agent;

specifically, each raw material is put into a raw material bin in the automatic batching equipment, the automatic batching equipment can transmit required amount of raw materials to the stirring mechanism according to the set value of the batching system, and the automatic batching equipment can be purchased in the market. For example, an automated batching device sends 83% dewatered cake, 14.5% cement, and 2.5% water reducer to the mixing mechanism as a percentage of the total batch. The cement is added into the ingredients, so that the workability of the ingredients can be improved, and bricks can be easily made; but as the cement addition increases, the batch strength decreases; the water reducing agent is added, so that the cement consumption can be reduced, the cost is reduced, the workability of the ingredients can be improved, and the strength is improved.

specifically, the batching equipment sends the required amount of the dewatered mud cake, the cement and the water reducing agent to the stirring mechanism, and then water accounting for 8 percent of the batching mass is added to the stirring mechanism and is stirred uniformly to obtain the brick making raw material. The ingredients are uniformly stirred, otherwise, the expected effect cannot be obtained, and shrinkage and drying cracks can be generated due to different shrinkage rates of various raw materials.

S600: and pressing the raw materials for making bricks to obtain the finished product brick.

Specifically, the brick making raw materials are sent to a brick making machine to be pressed to obtain finished bricks, and bricks with different structures, such as hollow bricks, perforated bricks, layered bricks and the like, can be made according to the purposes of the finished bricks, and the brick making machine can be purchased in the market.

According to the above contents, in the process for making bricks by using the pressing method of the building waste mud in the embodiment, the building waste mud is treated by a sand separating and washing machine, sand and stone in the waste mud are removed, and sand-removed mud is obtained; adding a flocculating agent into the desanded slurry to obtain flocculent block-shaped slurry, standing for a period of time, and removing supernatant; then sending the slurry to a belt filter press, and carrying out repeated filter pressing and dehydration on the slurry to obtain a dehydrated mud cake with the water content less than or equal to 35%; conveying the dehydrated mud cake to a batching system, batching according to 83% of the dehydrated mud cake, 14.5% of cement and 2.5% of a water reducing agent by the batching system, conveying the batching to a stirring mechanism, and adding water for uniform stirring; and (3) conveying the uniformly stirred raw materials to a pressure brick making machine for brick making to finally obtain a finished product brick. Through the brick making process by the pressing method of the building waste mud, the building waste mud is recycled, the treatment cost is reduced, and the economic value of the waste mud is realized.

Further, in this embodiment, the construction slurry in step S100 includes sand and bentonite, and the water content of the construction slurry is greater than or equal to 80%. Specifically, the building slurry in the invention is pollution-free slurry containing sandstone and bentonite, and the construction process is accompanied by a water adding process, so that the water content of the obtained building slurry is higher, and the water content filtration is different with different constructions through detection, but the water content filtration is more than or equal to 80%.

Further, the flocculant in S200 comprises polyacrylamide (anion) and quicklime, and is added according to the ratio of 1-1.1g/L of polyacrylamide (anion) to 10g/L of quicklime. Comparing solid-liquid separation effects of various chemical flocculants, finding that the best separation effect can be obtained by selecting polyacrylamide (anions) and quicklime for matching use, wherein the best addition amount of the selected polyacrylamide (anions) is 1-1.1g/L, and the best addition amount of the quicklime is 10 g/L; in this example, a flocculant was added to the slurry after the sand removal in a ratio of 1.05g/L of polyacrylamide (anion) to 10g/L of quicklime, and the mixture was rapidly stirred.

Further, step S300 specifically includes the following steps:

Specifically, in the present embodiment, step S310, step S320, and step S330 are all completed in a belt filter press, which is divided into a gravity dewatering section, a wedge-shaped pre-pressing section, and a filter-pressing dewatering section; after supernatant liquor of the flocculated slurry is removed, pumping the flocculated slurry to a mesh belt of a belt filter press, allowing free water between the slurries to flow out under the action of self weight, slightly extruding the slurry at a wedge-shaped prepressing section to remove free water on the surface, almost completely losing the fluidity, meeting the conditions of filter pressing and dewatering, and repeatedly extruding the slurry by reasonably arranging compression rollers; step S340, detecting the mud subjected to filter pressing and dehydration, and repeating the step S300 for the mud with the water content of more than 35% until obtaining a dehydrated mud cake with the water content of less than or equal to 35%.

Further, the water reducing agent is a water reducing agent with the water reducing rate of more than or equal to 15%. In this embodiment, the water reducing agent may be a polycarboxylic acid water reducing agent.

Further, in step S500, the stirring time is 5-10min, and the stirring speed is 60-200 r/min. Tests show that the rotating speed of the stirrer can influence the effect of the water reducing agent, the stirring rotating speed is set to be 60-200r/min to be optimal, and after cement is stirred by adding water, the cement is easy to separate after too long time, and the time is controlled to be 5-10 min. In the example, the rotating speed of the stirrer can be 130r/min, and the stirring time can be 7.5 min.

Further, step S600 specifically includes the following steps:

Specifically, the same raw material is supplied by the brick making machine each time, so that a product with the same standard can be obtained, and the brick making raw materials are weighed to obtain brick making raw materials with the same weight and then are sent to the brick making machine; the brick making machine presses the brick culture in a pressing and forming mode, and the prepared brick culture is placed on the brick containing plate, so that the brick culture is convenient to transport and place; the brick containing plate is conveyed to a curing room for curing, so that the influence of bad weather or environment on brick curing is prevented. The brick making machine in the embodiment can be a full-automatic brick making machine, and is a machine integrating an electric control system, a hydraulic system, a plate conveying machine, a brick receiving machine and a plate stacking machine, so that the labor cost is reduced.

Specifically, the curing room temperature is 10-30 ℃, the humidity is 70-90%, and the curing time is 10-15 days. The brick making process adopts compression molding, and the brick can not be exposed to sunlight and can not be cured at low temperature; the higher the ambient temperature is, the lower the relative humidity is, the higher the shrinkage speed of the brick culture is, and the brick is easy to crack; the higher the environmental temperature is, the lower the relative humidity is, the shorter the time for the brick culture to reach the relative equilibrium water content is, and the brick culture is easy to crack; the lower the ambient temperature, the longer the brick culture reaches relative stability, and after the temperature reaches 0 ℃, the brick culture may be accompanied by conditions of spalling. In the embodiment, the curing room with the temperature of 20 ℃ and the humidity of 80% can be selected for environmental curing for 12 days to obtain the finished product brick.

In the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first feature and the second feature or indirectly contacting the first feature and the second feature through an intermediate.

Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressing method brick making process for building waste mud is characterized by comprising the following steps:

80 to 90 percent of dehydrated mud cake

12 to 17 percent of cement

2 to 3 percent of water reducing agent;

2. The process according to claim 1, characterized in that: the construction mud comprises sandstone and bentonite, and the water content of the construction mud is greater than or equal to 80%.

3. The process according to claim 1, characterized in that: the flocculating agent in the S200 comprises polyacrylamide (anions) and quicklime, and is added according to the proportion of 1-1.1g/L of polyacrylamide (anions) to 10g/L of quicklime.

4. The process according to claim 1, characterized in that: the step S300 specifically comprises the following steps:

5. The process according to claim 1, characterized in that: the water reducing agent is a water reducing agent with the water reducing rate of more than or equal to 15%.

6. The process according to claim 1, characterized in that: in step S500, the stirring time is 5-10min, and the stirring speed is 60-200 r/min.

7. The process according to claim 1, characterized in that: the step S600 specifically includes the following steps:

8. The process according to claim 7, characterized in that: the curing room temperature is 10-30 ℃, the humidity is 70-90%, and the curing time is 10-15 days.