阅读说明：本技术 一种利用废弃烧结砖生产再生烧结页岩多孔砖的方法 (Method for producing regenerated sintered shale perforated brick by using waste sintered brick ) 是由 黄榜彪 黄秉章 李杰能 梁晓前 朱基珍 谢伟标 刘灏 杨雷铭 王锐 于 2020-06-19 设计创作，主要内容包括：本发明提供一种利用废弃烧结砖生产再生烧结页岩多孔砖的方法,包括以下步骤：S1.原材料预处理：将废弃烧结砖进行回收、分拣、破碎、研磨和筛分,得到粒径≤2mm的废弃烧结砖粉；将页岩进行破碎、研磨和筛分,得到粒径≤2mm的页岩粉；S2.陈化：将废弃烧结砖粉和页岩粉进行混合得到混合料,然后将混合料放入陈化库中进行陈化,其中,按照质量分数计,所述废弃烧结砖粉占混合料的10％～60％；S3.成型、干燥；S4.焙烧：将已经干燥的砖坯进行焙烧,冷却得到再生烧结页岩多孔砖,其中,焙烧温度为900～1100℃,焙烧时间4～10h,升温速率为1～2℃/min。该透水砖采用废弃烧结砖和页岩为基本原料,消耗固体废弃物、减少制砖粘土的开采量、节约耕地、合理利用资源。(The invention provides a method for producing a regenerated sintered shale perforated brick by using a waste sintered brick, which comprises the following steps: s1, raw material pretreatment: recycling, sorting, crushing, grinding and screening the waste sintered bricks to obtain waste sintered brick powder with the particle size of less than or equal to 2 mm; crushing, grinding and screening shale to obtain shale powder with the particle size of less than or equal to 2 mm; s2, aging: mixing waste sintered brick powder and shale powder to obtain a mixture, and then putting the mixture into an aging warehouse for aging, wherein the waste sintered brick powder accounts for 10% -60% of the mixture according to mass fraction; s3, forming and drying; s4, roasting: and roasting the dried green bricks, and cooling to obtain the regenerated sintered shale porous bricks, wherein the roasting temperature is 900-1100 ℃, the roasting time is 4-10 h, and the heating rate is 1-2 ℃/min. The water permeable brick adopts waste sintered bricks and shale as basic raw materials, consumes solid waste, reduces the mining amount of brick-making clay, saves cultivated land and reasonably utilizes resources.)

1. A method for producing a regenerated sintered shale perforated brick by using waste sintered bricks is characterized by comprising the following steps:

s1, raw material pretreatment:

recycling, sorting, crushing, grinding and screening the waste sintered bricks to obtain waste sintered brick powder with the particle size of less than or equal to 2 mm;

crushing, grinding and screening shale to obtain shale powder with the particle size of less than or equal to 2 mm;

s2, aging:

mixing waste sintered brick powder and shale powder to obtain a mixture, and then putting the mixture into an aging warehouse for aging, wherein the waste sintered brick powder accounts for 10% -60% of the mixture according to mass fraction;

s3, forming and drying:

putting the aged mixture into a molding blank, molding the brick blank, and then drying the molded brick blank;

s4, roasting:

and roasting the dried green bricks, and cooling to obtain the regenerated sintered shale porous bricks, wherein the roasting temperature is 900-1100 ℃, the roasting time is 4-10 h, and the heating rate is 1-2 ℃/min.

2. The method for producing the regenerative sintered shale porous brick from the waste sintered brick as claimed in claim 1, wherein in step S1, the particle size distribution of the waste sintered brick powder and shale powder is: d is more than 1.18mm and less than or equal to 2mm and is 15-30%, d is more than 0.6mm and less than or equal to 1.18mm and is 20-30%, d is more than 0.315mm and less than or equal to 0.6mm and is 15-25%, d is more than 0.16mm and less than or equal to 0.315mm and is 10-20%, d is more than 0.08mm and less than or equal to 0.16mm and is 10-20%, d is less than or equal to 0.08mm and is 0.1-10%.

3. The method for producing the regenerated sintered shale porous brick from the waste sintered brick as claimed in claim 1, wherein in step S2, the mixture further comprises an activator with a mass fraction of 0.5% -5%, and the activator comprises 80-90 parts by mass of lime, 1-10 parts by mass of sodium carbonate, 3-8 parts by mass of sodium metasilicate, 2-5 parts by mass of sodium sulfate, and 1-6 parts by mass of gypsum.

4. The method for producing the regenerative shale porous brick from the waste baked brick as claimed in claim 1, wherein in step S2, the waste baked brick powder is 40% to 60% of the mixed material.

5. The method for producing the regenerated sintered shale perforated brick from the waste sintered brick as claimed in claim 1, wherein the aging time in step S2 is 8-24 h.

6. The method for producing the regenerated sintered shale perforated brick from the waste sintered brick as claimed in claim 1, wherein in step S3, the formed green brick is naturally dried to a moisture content of 10% to 15%.

7. The method for producing the regenerated sintered shale porous brick from the waste sintered brick as claimed in claim 1, wherein the firing temperature is 1050 ℃ in step S4.

8. The method for producing the regenerated sintered shale porous bricks from the waste sintered bricks according to claim 1, wherein the roasting time is 8 hours in step S4.

9. The method for producing the reclaimed sintered shale perforated brick from the waste sintered brick as claimed in claim 1, wherein the temperature rising rate is 1 ℃/min in step S4.

Technical Field

The invention relates to the field of building materials, in particular to a method for producing a regenerated sintered shale perforated brick by using a waste sintered brick.

Background

In recent years, as the economic construction of China is accelerated, the urban construction and traffic construction process of China are also accelerated. In this process, a large amount of construction waste is generated. The existing building garbage treatment in China still mainly takes stacking and landfill means, and the environmental impact and loss caused by the treatment means are huge. The construction waste mainly comprises waste concrete blocks, waste asphalt concrete, broken and sintered brick slag blocks and wastes such as mortar, metal, wood and the like scattered in the construction process. Along with the acceleration of the industrialization and urbanization process of China, the accompanying increase of the generated construction waste, and at present, China is the country with the largest urban construction scale in the world. In the face of a severe situation of building waste surrounding cities, how to reasonably control the building waste becomes a problem which needs to be solved urgently by government departments and expert scholars.

In China, in recent years, a large number of expert scholars, colleges and universities and scientific research institutes develop researches around the problem of construction waste, and the researches and developments include a construction waste recycling technology and a demonstration production line in earthquake disaster areas, which are hosted by Zhang Xiong professor of Tongji university, and a construction waste regeneration product, which is hosted by Li autumn professor of Qingdao university, and the like. But the regeneration and resource utilization rate of the building wastes of a few cities in China is higher, and most of the rest cities are still open-air landfill and stacking in an extensive way, and the resource utilization rate is less than 5%.

The waste sintered shale porous bricks come from construction wastes removed by house reconstruction and unqualified waste bricks produced by brick factories due to uncontrollable factors, China has produced a large amount of clay brick products for a long time in the past, and the clay brick products are also converted into construction solid wastes in the next decades, at present, the total stacking amount of construction wastes in China reaches 70 × 10⁹The ton of the waste material of the baked brick is estimated to be 30-50% of the total construction waste, most of the waste material of the baked brick is transported to the suburb for open-air stacking or landfill without any treatment, the stacking or landfill needs a large amount of construction investment such as land acquisition, and the like, and the problems of scattering, dust emission and the like in the clearing and stacking process are also aggravated, so that the environmental impact and pollution are further aggravated. Therefore, resource utilization of waste baked bricks has become an urgent problem to be solved.

Disclosure of Invention

The invention aims to solve the problems and provide a method for producing a regenerated sintered shale perforated brick by using waste sintered bricks.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for producing regenerated sintered shale perforated bricks by using waste sintered bricks comprises the following steps:

s1, raw material pretreatment:

recycling, sorting, crushing, grinding and screening the waste sintered bricks to obtain waste sintered brick powder with the particle size of less than or equal to 2 mm;

the shale is crushed, ground and screened to obtain shale powder with the grain size less than or equal to 2 mm.

S2, aging:

mixing the waste sintered brick powder and the shale powder to obtain a mixture, and then putting the mixture into an aging warehouse for aging, wherein the waste sintered brick powder accounts for 10% -60% of the mixture according to the mass fraction.

S3, forming and drying:

and (3) putting the aged mixture into a molding blank, molding the brick blank, and then drying the molded brick blank.

S4, roasting:

and roasting the dried green bricks, and cooling to obtain the regenerated sintered shale porous bricks, wherein the roasting temperature is 900-1100 ℃, the roasting time is 4-10 h, and the heating rate is 1-2 ℃/min.

Preferably, in step S1, the particle size distribution of the waste sintered brick powder and shale powder is: d is more than 1.18mm and less than or equal to 2mm and is 15-30%, d is more than 0.6mm and less than or equal to 1.18mm and is 20-30%, d is more than 0.315mm and less than or equal to 0.6mm and is 15-25%, d is more than 0.16mm and less than or equal to 0.315mm and is 10-20%, d is more than 0.08mm and less than or equal to 0.16mm and is 10-20%, d is less than or equal to 0.08mm and is 0.1-10%.

Preferably, in the step S2, the mixture further includes an activator with a mass fraction of 0.5% to 5%, and the activator includes, by mass, 80 to 90 parts of lime, 1 to 10 parts of sodium carbonate, 3 to 8 parts of sodium metasilicate, 2 to 5 parts of sodium sulfate, and 1 to 6 parts of gypsum.

Preferably, in step S2, the waste sintered brick powder accounts for 10% to 40% of the mixture.

Preferably, in the step S2, the aging time is 8-24 hours.

Preferably, in step S3, the formed green brick is naturally dried until the water content is 10% to 15%.

Preferably, in step S4, the calcination temperature is 1050 ℃.

Preferably, in step S4, the baking time is 8 h.

Preferably, in step S4, the temperature increase rate is 1 ℃/min.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

1. the method for producing the regenerated sintered shale perforated brick, which is related by the invention, takes the construction waste sintered brick and the shale as basic raw materials to prepare the regenerated sintered shale perforated brick, consumes solid wastes, reduces the mining amount of brick making clay, saves cultivated land and reasonably utilizes resources.

2. The method for producing the regenerated sintered shale perforated brick comprises the steps of crushing and grinding the waste sintered brick and the shale until the grain size is less than or equal to 2mm, on one hand, activating the activity of waste sintered brick powder, on the other hand, improving the compactness of a finished perforated brick product and improving the strength. In addition, the particle size distribution is: d is more than 1.18mm and less than or equal to 2mm and is 15-30%, d is more than 0.6mm and less than or equal to 1.18mm and is 20-30%, d is more than 0.315mm and less than or equal to 0.6mm and is 15-25%, d is more than 0.16mm and less than or equal to 0.315mm and is 10-20%, d is more than 0.08mm and is less than or equal to 0.16mm and is 10-20%, d is less than or equal to 0.08mm and is 0.1-10%, and the compactness of the perforated brick is ensured, and the uniformity of the inner gaps of the perforated brick can be.

The composite excitant is adopted to excite the waste sintering powder and the shale, and the excitation effect is better. Lime, sodium carbonate, sodium metasilicate, sodium sulfate and gypsum are adopted to carry out synergistic action to excite SiO₂、Al₂O₃The polymerization degree of the network polymer on the surface of the waste sintered brick powder and the shale with higher content is reduced under the action of the composite excitant, free unsaturated bonds are formed on the surface, and the waste sintered brick powder and the shale are easy to react with Ca (OH) in the system₂The reaction generates the gelled products such as calcium silicate hydrate, calcium aluminate hydrate and the like, thereby improving the compactness of the porous brick and further improving the strength.

3. The method for producing the regenerated sintered shale porous brick is an important link for determining the quality of the sintered shale porous brick, and the performance of the sintered brick is more stable than that of a non-sintered brick because the physical and chemical properties of the sintered brick are changed after high-temperature roasting. When the green body is roasted at high temperature, part of particles in the raw material are melted into substances in a molten state, and holes in the brick body are filled with the substances in the molten state, so that the porosity is small. Moreover, the brick body can utilize the molten substances formed after sintering to bond the particles which are not formed with the molten substances in the brick body to form a strength whole, so that the sintered brick has certain strength; finally, the substances in the molten state can be condensed on the outer surface of the brick body after being cooled to form a layer of protective substances, so that the brick sintered at high temperature has low water absorption, strong durability and good freeze-thaw resistance. However, if the sintering temperature is lower than the temperature at which the powder particles are melted, sufficient melted substances cannot be formed on the surface of the brick body, and the porosity and compactness of the sintered product cannot meet the standards, so that the strength of the brick body cannot meet the requirements. When the sintering temperature is too high, the powder particles in the green body all reach a molten state, the green body can soften and flow in the sintering process, the sintered brick body deforms too much, and the appearance quality of the brick body is unqualified. The sintering shale porous brick blank regenerated from the construction waste is heated from room temperature to 1050 ℃ at the speed of 1 ℃/min, and the sintering time is kept for 8h in the test. And after the calcining procedure is finished, the sintering is stopped, and then the temperature is reduced and the temperature is cooled for about 12 hours, so that the obtained regenerated sintered shale porous brick has higher strength.

Drawings

FIG. 1 is an XRD pattern of shale;

FIG. 2 is an XRD spectrum of a waste sintered brick;

FIG. 3 is a shale powder particle size fraction;

FIG. 4 is a particle size distribution of waste sintered brick powder;

FIG. 5 is an XRD analysis of brick samples at different sintering times;

FIG. 6 is an XRD analysis of brick samples at different sintering temperatures.

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 with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the embodiment of the invention, shale is selected from shale stock materials of Gaoyang brick factories in Liuzhou, the specific chemical components are shown in Table 1, and the XRD (X-ray diffraction) pattern is shown in FIG. 1.

The waste sintered shale porous bricks are derived from construction wastes removed from house reconstruction and substandard waste bricks produced by brickyard due to uncontrollable factors, and an XRD (X-ray diffraction) spectrum is shown in figure 2.

TABLE 1 shale chemical composition Table