CN116395997A - A kind of auxiliary gelling material and its preparation method and application - Google Patents

Abstract

The invention relates to the technical field of municipal engineering and building materials, in particular to an auxiliary gelling material and its preparation method and application. The auxiliary gelling material includes flash-fired clay and mineralized regenerated micropowder; the preparation method of the flash-fired clay includes slurrying and pressing the engineering spoil to obtain a mud cake, and performing wet filtration, centrifugation, drying and drying of the mud cake in sequence. Grinding to obtain clay powder, and then calcining the clay powder; the preparation method of mineralized regenerated micropowder includes mineralizing regenerated micropowder through semi-dry method and then drying and grinding to obtain mineralized regenerated micropowder, wherein semi-dry method mineralized The specific steps include: spraying sodium hydroxide solution on the flat surface of the regenerated micropowder for wetting, and then placing it in an environment with a relative humidity of 80%RH to 100%RH for mineralization. The auxiliary cementitious material can replace ordinary portland cement in a large proportion, and the preparation method has low energy consumption, short time consumption and high efficiency.

Description

A kind of auxiliary gelling material and its preparation method and application

technical field

The invention relates to the technical field of municipal engineering and building materials, in particular to an auxiliary gelling material and its preparation method and application.

Background technique

The continuous and rapid growth of the population of the urban agglomeration has led to an increasing demand for residential and transportation infrastructure. The engineering spoils generated by various buildings and municipal projects in Shenzhen alone are close to 100 million tons every year. Therefore, the disposal and consumption of engineering spoils It has increasingly become a bottleneck in the construction of "zero waste cities". At present, the resource utilization of engineering spoils mostly uses cement or water glass as a binder and engineering spoils as fillers to prepare building materials.

In addition to a large amount of engineering spoils, urban construction will also produce a large amount of building demolition materials. Some of the demolition materials can be recycled to produce recycled aggregates, but in the process of producing recycled aggregates, the weight of recycled aggregates will account for about 10%~ 20% of the by-product is recycled micropowder. Currently, the resource utilization of recycled micropowder is similar to that of engineering spoil, and it is mostly used as a filling material.

At present, in addition to being used as a filler, there is an existing technology of calcining engineering spoil and using it as a cement mixture, but the calcination process is time-consuming and energy-intensive. Likewise, for recycled micropowder, in addition to being used as a filler, there are applications of regenerated micropowder mineralized by carbon dioxide and used as a pure carbon-fixing material, cement admixture, or concrete admixture. Currently disclosed carbon dioxide mineralization regenerated micropowder mostly adopts dry mineralization or wet mineralization, but because the mineralization reaction process involves both the diffusion of gas on the surface of the powder and the reaction between gas and powder through the medium water, so Dry mineralization is less efficient, while wet mineralization requires higher energy consumption during agitation. Although the pozzolanic activity of mineralized regenerated micropowder is higher than that of limestone, if only mineralized regenerated micropowder is used as a cement mixture, its performance is still lower than that of cement prepared from granulated blast furnace slag powder or fly ash commonly used at present. Mixed wood.

Contents of the invention

In view of the above technical problems, the present invention provides an auxiliary cementitious material and its preparation method and application. The auxiliary cementitious material has good compressive strength and can replace part of the use of cement. The preparation method has low energy consumption, short time consumption and high efficiency .

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

The invention provides an auxiliary gelling material, including flash fired clay and mineralized regenerated micropowder;

The preparation method of the flash-fired clay specifically comprises: pulping and press-filtering the engineering spoil to obtain a mud cake, and sequentially performing wet filtration, centrifugation, drying and grinding on the mud cake to obtain clay powder, and The clay powder is calcined in a suspended state in air to obtain flash-fired clay, the temperature of the calcination is 850°C-950°C, and the calcination time is 0.5s-1.5s;

The preparation method of the mineralized regenerated micropowder specifically includes: mineralizing the regenerated micropowder through a semi-dry method, and then drying and grinding to obtain a mineralized regenerated micropowder. The specific steps of the semidry method mineralization include: The surface of the regenerated fine powder is sprayed with sodium hydroxide solution for wetting, and then placed in an environment with a relative humidity of 80%RH to 100%RH for mineralization.

In the present invention, the mud cake used to prepare the flash clay is made of clay and quartz sand. Because the particle diameter of clay minerals is generally smaller than that of quartz sand, the quartz sand can be removed as much as possible by wet filtration, and the clay minerals can be removed as much as possible. It is possible to filter as much as possible into the filtrate to increase the specific gravity of clay minerals in the fine particulate matter precipitate obtained after centrifugation of the filtrate. The obtained clay powder contains minerals such as kaolinite, illite, montmorillonite, quartz and the like, and the main active ingredient is kaolinite. High-temperature calcination can dehydroxylate the kaolinite to form metakaolin with an amorphous structure. Moreover, in the method for preparing flash-fired clay provided by the present invention, the clay powder is calcined in a suspended state in the air, which increases the specific surface area of the clay powder and improves the calcining efficiency, and the calcining time used is the same as that of the prior art Compared with the calcination method of the prior art, it not only improves the preparation efficiency, but also saves energy.

The regenerated micropowder used in the preparation of mineralized regenerated micropowder in the present invention is a by-product in the process of producing recycled aggregates from construction and demolition materials. It is mainly composed of hardened cement slurry, and its main components include a small amount of unhydrated cement particles, hydroxycalcite, and aluminum hydrate. Calcium silicate gel, ettringite, monosulfide calcium aluminate hydrate, etc. During the mineralization process of carbon dioxide, hexasite is transformed into calcium carbonate, and other components are decalcified to form aluminosilicate gel, which has pozzolanic activity; calcium carbonate not only participates in the hydration reaction, but also provides nucleation sites , to accelerate the cement hydration reaction. The preparation method of the mineralized regenerated micropowder provided by the present invention adopts a semi-dry method for mineralization. Due to the existence of liquid phase sodium hydroxide solution, the dissolution of carbon dioxide in the liquid phase is accelerated, and the efficiency is higher compared with dry mineralization; Moreover, because the sodium hydroxide solution is sprayed, the amount of liquid on the surface of the regenerated micro-powder is less than that of wet mineralization, and carbon dioxide is more likely to diffuse between the surfaces of the regenerated micro-powder, and there is no need for a continuous process of wet mineralization. Stirring operation requires less energy consumption.

In combination with the first aspect, the particle size of the mud cake is less than 2.36 mm, and the particles constituting the mud cake can be quickly dispersed below this particle size.

In combination with the first aspect, the specific steps of wet filtration, centrifugation, drying and grinding are as follows: after uniformly mixing the mud cake and water at a mass ratio of 1:20-50, use a sieve with a pore size not greater than 25 μm Filtrate and collect the filtrate, then centrifuge the obtained filtrate and collect the fine particle precipitate in the lower layer; air-dry the fine particle precipitate until the water content is less than 5%, and then grind and sieve to obtain clay powder with a sieved aperture of 75 μm.

In combination with the first aspect, the specific steps of the semi-dry method of mineralization include: spreading the regenerated fine powder according to the standard that the thickness of the regenerated micropowder is not greater than 1mm after being flattened, and adding sodium hydroxide The solution is evenly sprayed on the surface of the regenerated micropowder spread out to make it wet, and then the wetted regenerated micropowder is placed in a carbon dioxide concentration of 10%~30%, a temperature of 20°C~30°C, and a relative humidity of 80%RH~ Mineralization is carried out in an environment of 90% RH, and the mineralization time is not less than 1h.

Preferably, the mineralization temperature is 20° C. to 25° C., and the mineralization time is 1 h to 3 h. The mineralization time can ensure that the mineralization reaction is fully carried out.

In combination with the first aspect, the concentration of the sodium hydroxide solution is 3g/L-5g/L.

In combination with the first aspect, the mass ratio of the flash-fired clay and the mineralized regenerated fine powder is 1.5-2.2:1, preferably 2:1, by adjusting the ratio of the flash-fired clay and the mineralized regenerated fine powder in the auxiliary The mass ratio can meet the different performance requirements of auxiliary cementitious materials in different applications.

The second aspect of the present invention provides a method for preparing an auxiliary gelling material. According to the preparation method of the above-mentioned flash-fired clay and the preparation method of the mineralized regenerated micro-powder, the flash-fired clay and the mineralized regenerated micro-powder are respectively prepared, and the obtained flash-fired clay and the regenerated mineralized powder are prepared respectively. Mineralized regenerated micropowder is mixed according to the mass ratio of 1.5-2.2:1.

The preparation method includes the preparation of flash-fired clay and the preparation of mineralized regenerated micropowder, wherein the preparation method of flash-fired clay effectively improves the calcination efficiency by controlling the calcination temperature and calcination time, and forms metakaolin with an amorphous structure ; The preparation method of the mineralized regenerated micropowder does not need to be stirred for a long time, the operation is simple, and the energy consumption is lower.

The third aspect of the present invention provides a kind of application of above-mentioned auxiliary gelling material in cementitious material, this auxiliary gelling material is used in the preparation of cementitious material, the compressive strength of the obtained cementitious material is comparable to ordinary silicic acid The compressive strength of salt cement is comparable.

With reference to the third aspect, the cementitious material further includes cement.

In combination with the third aspect, the mass proportion of cement in the cementitious material is 45%-60%.

In the cementitious material comprising the auxiliary cementitious material and cement, the main active ingredient of the flash clay in the auxiliary cementitious material is metakaolin with an amorphous structure, which can dissolve hydrated aluminate ions and hydrated silicon under alkaline conditions. Acid radical ions react with calcium ions dissolved in cement to form calcium aluminosilicate hydrate gel; the main active ingredient in the mineralized regenerated micropowder in the auxiliary cementitious material is nano-calcium carbonate, which is formed by decalcification of calcium aluminosilicate hydrate The aluminosilicate gel, the aluminosilicate gel reacts with the calcium ions in the cement to generate calcium aluminosilicate hydrate gel again; The hydrated aluminate ion dissolved in kaolin reacts to form half-carbon and single-carbon calcium aluminate hydrate. Therefore, the flash-fired clay contained in the auxiliary cementitious material and the main active ingredient of the mineralized regenerated micropowder have a certain synergistic effect in the cement hydration reaction.

The beneficial effects of the present invention are: the preparation method of the auxiliary gelling material provided by the present invention is short in time, low in energy consumption and high in efficiency, and can complete the preparation of flash fired clay and mineralized regenerated micropowder in a short time and low in energy consumption. When the obtained auxiliary cementitious material is applied to cementitious materials, the performance of the composite cement obtained by mixing the auxiliary cementitious material with ordinary cement is equivalent to that of ordinary Portland cement, so the auxiliary cementitious material can replace ordinary silicate cement in a large proportion. The use of salt cement; and by adjusting the ratio of flash-fired clay and mineralized regenerated micropowder in the auxiliary cementitious material, it can also stabilize the performance fluctuation of the composite cement caused by engineering spoils and demolition materials with complex sources.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The engineering spoil used in the embodiment of the present invention and comparative example comes from a certain construction site in Nanshan District, Shenzhen City. After dehydration, pulping, and pressure filtration, it becomes a mud cake, and through a sieve with an aperture of 2mm, it is air-dried, and the mud after air-drying The chemical composition of the cake is as follows on an oxide weight basis:

chemical components Mass proportion (%) silica 61.2 Aluminum oxide 20.7 iron oxide 5.2 potassium oxide 3.2 Loss on ignition 9.7

.

The regenerated micropowder used in the examples and comparative examples of the present invention is obtained by sieving the regenerated fine aggregate with a particle size of less than 2.36 mm through a 75 μm sieve in the process of producing recycled aggregates from construction and demolition materials. The chemical composition of the regenerated micropowder Calculated by oxide weight as follows:

chemical components Mass proportion (%) Calcium Oxide 32.1 silica 35.8 Aluminum oxide 3.2 magnesium oxide 9.4 sulphur trioxide 2.1 other 1.9 Loss on ignition 15.5

.

The cement used in the embodiments of the present invention and comparative examples is pure Portland cement, which is formed by mixing cement clinker and dihydrate gypsum of P·I 42.5R grade, and its chemical composition is as follows in terms of oxide weight:

chemical components Mass proportion (%) Calcium Oxide 67.0 silica 18.6 Aluminum oxide 5.4 magnesium oxide 1.3 sulphur trioxide 3.1 iron oxide 3.0 other 1.6

.

The sodium hydroxide used in the embodiment of the present invention and the comparative example is analytically pure, and the purity is ≥ 96%; the carbon dioxide gas is a high-purity gas, and the purity is 99.99%; the compressed air is high-purity air, and the purity is 99.999%; Polycarboxylate superplasticizer.

Example 1

This embodiment provides a method for preparing auxiliary cementitious material flash-fired clay, and the specific steps are as follows:

(1) Mix the air-dried mud cake and water evenly at a mass ratio of 1:35 to obtain a slurry in which the particles are fully dispersed;

(2) filter the mud through a sieve with an aperture of 25 μm to obtain a filtrate;

(3) The filtrate is centrifuged for 10 minutes with a gravitational acceleration of 1000g in a centrifuge, and the supernatant is discharged to obtain fine particle precipitation;

(4) Air-dry the fine particles precipitated under natural conditions until the water content is less than 5%, grind and pass through a 75 μm sieve to obtain clay powder;

(5) Mix the clay powder with compressed air and spray it in from the top of the vertical tube furnace. The clay powder is dispersed in a suspended state. The temperature in the furnace is set at 900°C and calcined for 1.0s to obtain the flash fired clay.

Example 2

This embodiment provides a method for preparing auxiliary cementitious material flash-fired clay, and the specific steps are as follows:

(1) Mix the air-dried mud cake and water evenly at a mass ratio of 1:20 to obtain a slurry in which the particles are fully dispersed;

(2) filter the mud through a sieve with an aperture of 25 μm to obtain a filtrate;

(3) The filtrate was centrifuged for 15 minutes with a gravitational acceleration of 1000g in a centrifuge, and the supernatant was discharged to obtain fine particle precipitation;

(4) Air-dry the fine particles precipitated under natural conditions until the water content is less than 5%, grind and pass through a 75 μm sieve to obtain clay powder;

(5) Mix the clay powder with compressed air and spray it in from the top of the vertical tube furnace. The clay powder is dispersed in a suspended state. The temperature in the furnace is set at 850°C and calcined for 0.5s to obtain the flash fired clay.

Example 3

This embodiment provides a method for preparing auxiliary cementitious material flash-fired clay, and the specific steps are as follows:

(1) Mix the air-dried mud cake and water evenly at a mass ratio of 1:50 to obtain a slurry in which the particles are fully dispersed;

(2) filter the mud through a sieve with an aperture of 25 μm to obtain a filtrate;

(3) The filtrate is centrifuged for 10 minutes with a gravitational acceleration of 1000g in a centrifuge, and the supernatant is discharged to obtain fine particle precipitation;

(4) Air-dry the fine particles precipitated under natural conditions until the water content is less than 5%, grind and pass through a 75 μm sieve to obtain clay powder;

(5) Mix the clay powder with compressed air and spray it in from the top of the vertical tube furnace. The clay powder is dispersed in a suspended state. The temperature in the furnace is set at 950°C and calcined for 1.5s to obtain the flash fired clay.

Example 4

This embodiment provides a preparation method of auxiliary gelling material mineralization regenerated micropowder, the specific steps are as follows:

(1) Flatten the regenerated micropowder obtained by sieving through a 75 μm sieve in a stainless steel tray, and the powder thickness is 1mm;

(2) Spray 4g/L sodium hydroxide aqueous solution evenly on the surface of the regenerated micropowder that has been spread out to make it wet according to the ratio of solid to liquid mass ratio of 0.05:1;

(3) Place the wetted regenerated micropowder in an environment where the carbon dioxide concentration is 20%, the temperature is 25° C., and the relative humidity is 90% RH, and reacts for 2 hours;

(4) Air-dry the reacted regenerated micropowder under natural conditions until the moisture content is less than 5%, grind and pass through a 75 μm sieve to obtain mineralized regenerated micropowder.

Example 5

This embodiment provides a preparation method of auxiliary gelling material mineralization regenerated micropowder, the specific steps are as follows:

(1) Flatten the regenerated micropowder obtained by sieving through a 75 μm sieve in a stainless steel tray, and the powder thickness is 0.8mm;

(2) Spray 3g/L sodium hydroxide aqueous solution evenly on the surface of the regenerated micropowder that has been spread out to make it wet according to the ratio of solid to liquid mass ratio of 0.01:1;

(3) Place the wetted regenerated micropowder in an environment with a carbon dioxide concentration of 10%, a temperature of 20° C., and a relative humidity of 80% RH for 1 hour;

(4) Air-dry the reacted regenerated micropowder under natural conditions until the moisture content is less than 5%, grind and pass through a 75 μm sieve to obtain mineralized regenerated micropowder.

Example 6

This embodiment provides a preparation method of auxiliary gelling material mineralization regenerated micropowder, the specific steps are as follows:

(1) Flatten the regenerated micropowder obtained by sieving through a 75 μm sieve in a stainless steel tray, and the powder thickness is 1.0mm;

(2) Spray 5g/L sodium hydroxide aqueous solution evenly on the surface of the regenerated micropowder that has been spread out to make it wet according to the ratio of solid to liquid mass ratio of 0.1:1;

(3) Place the wetted regenerated micropowder in an environment where the carbon dioxide concentration is 30%, the temperature is 30° C., and the relative humidity is 100% RH, and reacts for 3 hours;

(4) Air-dry the reacted regenerated micropowder under natural conditions until the moisture content is less than 5%, grind and pass through a 75 μm sieve to obtain mineralized regenerated micropowder.

Example 7

This embodiment provides an auxiliary gelling material composed of the flash fired clay prepared in Example 1 and the mineralized regenerated micropowder prepared in Example 4 and its application in gelling materials, auxiliary gelling material and gelling The composition ratio of the materials is shown in Table 1.

Example 8

This embodiment provides an auxiliary gelling material composed of the flash-fired clay obtained in Example 2 and the mineralized regenerated micropowder prepared in Example 5 and its application in gelling materials, auxiliary gelling material and gelling The composition ratio of the materials is shown in Table 1.

Example 9

This embodiment provides an auxiliary gelling material composed of the flash-fired clay prepared in Example 3 and the mineralized regenerated micropowder prepared in Example 6 and its application in gelling materials, auxiliary gelling material and gelling The composition ratio of the materials is shown in Table 1.

Examples 10-12

This embodiment provides an auxiliary gelling material composed of the flash fired clay prepared in Example 1 and the mineralized regenerated micropowder prepared in Example 4 and its application in gelling materials, auxiliary gelling material and gelling The composition ratio of the materials is shown in Table 1.

Comparative example 1

This comparative example provides a method for preparing flash-fired clay. The specific steps are similar to those in Example 1, except that the clay powder is calcined at 800° C. for 2 hours.

Comparative example 2

This comparative example provides a preparation method of dry mineralized regenerated micropowder. The specific steps are as follows: flatten the regenerated micropowder in a stainless steel tray, the thickness of the powder is 1.0mm, and place it in a place where the concentration of carbon dioxide is 20% and the temperature is 25°C. , react in an environment with a relative humidity of 60% RH for 2 hours to obtain dry mineralized regenerated micropowder.

Comparative example 3

This comparative example provides a kind of preparation method of semi-dry method mineralized regenerated micropowder, and concrete steps are similar to embodiment 4, difference only is that sodium hydroxide solution is replaced by pure water and sprayed, obtain semidry method mineralized regenerated micropowder (spray water).

Comparative example 4～7

Comparative Examples 4-7 provide 4 kinds of cementitious materials, wherein the calcined clay used in Comparative Example 5 is prepared from Comparative Example 1, and the calcined clay and dry mineralized regenerated micropowder used in Comparative Example 6 are prepared from Comparative Example 1 and Comparative Example 2 respectively. Prepared, semi-dry method mineralized regenerated micropowder (water spray) and flash fire clay used in Comparative Example 7 were prepared by Comparative Example 3 and Example 2 respectively. The composition ratio of the gelling material in Comparative Examples 4-7 is shown in Table 1.

The component distribution ratio of the cementitious material in Table 1 embodiment 7～12 and comparative example 4～7

。

.

Test case 1

X-ray diffraction analysis was carried out on the flashed clay prepared in Examples 1-3 and the calcined clay prepared in Comparative Example 1 by adding 20% zinc oxide powder, and the results are shown in Table 2.

The X-ray diffraction result of table 2 embodiment 1～3 and comparative example 1

example Amorphous content (%) Example 1 26.9 Example 2 21.8 Example 3 33.2 Comparative example 1 39.6

.

From the test results in Table 2, it can be seen that Examples 1 to 3 adopt the method of flash calcination. Although the kaolinite cannot be completely converted into metakaolin due to the short calcination time, the efficiency and energy consumption of flash calcination are still significantly higher than those of ordinary calcination. Advantage. Compared with Example 2, the amorphous content in Example 3 is greatly increased, indicating that within a certain temperature and time range, higher temperature and longer calcination time are conducive to the transformation of kaolinite into metakaolin.

Test case 2

Carry out thermogravimetric analysis to the mineralization regeneration micropowder that embodiment 4～6 makes, the dry mineralization regeneration micropowder that comparative example 2 makes and the semi-dry method mineralization regeneration micropowder (water spray) that comparative example 3 makes respectively, The results are shown in Table 3.

The thermogravity result of table 3 embodiment 4～6 and comparative example 2～3

。

.

From the test results in Table 3, it can be seen that the mineralization efficiency of Examples 4-6 using semi-dry mineralization is significantly higher than that of Comparative Example 2 using dry mineralization, and Comparative Example 3 uses pure water for wet regeneration The semi-dry mineralization efficiency of the micropowder also increased, indicating that spraying a certain concentration of sodium hydroxide solution on the regenerated micropowder for semi-dry mineralization would solidify more carbon dioxide.

Compared with Example 5, the calcium carbonate content in Example 6 is improved, indicating that within a certain humidity range and mineralization time, higher humidity and longer mineralization time are conducive to the phase transformation of cement stones into calcium carbonate.

Test case 3

The cementitious materials provided in Examples 7-12 and Comparative Examples 4-7 were mixed with water according to the water gel mass ratio of 0.35 to prepare cement paste, and 0.5% of the cementitious material weight water reducer was added, and respectively The mechanical strength of the obtained cement slurry was tested, and the results are shown in Table 4.

The mechanical properties of the cement slurry corresponding to the gel material of Table 4 Examples 7-12 and Comparative Examples 4-7

。

.

From the data in Table 4, it can be seen that in Examples 7-9, with the increase of the active ingredients in the auxiliary gelling material, the mechanical properties of the clean pulp are slightly improved. Nevertheless, the particle filling effect of auxiliary cementitious materials still has a large contribution to the strength. Compared with Example 7, although the proportion of cement in the cementitious material in Example 10 and Example 12 reduces and causes the clean slurry strength to reduce to some extent, the consumption of cement is reduced, and the clean slurry strength obtained can still satisfy Requirements for use: The reduction in the proportion of flash-fired clay in the auxiliary cementitious material of Example 11 reduces the early strength of the clean slurry, indicating that the ratio of flash-fired clay-mineralized regenerated micropowder has an impact on its synergistic effect.

In addition, except for Example 10, the mechanical properties of the other examples and the pure Portland cement slurry in Comparative Example 4 have no significant difference or are slightly improved, indicating that the composite cement prepared by the auxiliary cementitious material is comparable in performance to that of pure silicate cement. Salt cement is equivalent; compared with the limestone calcined clay cement of Comparative Example 5, although there is no significant difference in strength, the mineralized recycled micropowder replaces the natural raw material, and the preparation process solidifies carbon dioxide, which has advantages in reducing the carbon footprint of cementitious materials; Compared with Comparative Example 6 and Comparative Example 5, due to the low active ingredient in the regenerated micropowder of dry mineralization, the synergistic effect with calcined clay is weak, which has a greater impact on the early strength of the clean slurry; in Comparative Example 7, the auxiliary gelling The material contains semi-dry mineralized regenerated micropowder (sprayed with water). Compared with Example 8, the early strength of the clean slurry is reduced due to the relatively low content of active ingredients.

Through the above-mentioned analysis, it can be known that the mechanical properties of the cementitious material prepared by compounding the auxiliary cementitious material provided by the present invention and cement are equivalent to the mechanical properties of the cementitious material with pure Portland cement, indicating that the auxiliary cementitious material provided by the invention can be A large proportion replaces the use of ordinary Portland cement.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technology of the present invention Any equivalent replacement or change of the scheme and its inventive concepts shall fall within the protection scope of the present invention.

Claims (10)

1. An auxiliary gelling material, characterized in that, comprises flash fired clay and mineralized regenerated micropowder; The preparation method of the flash-fired clay specifically includes: slurrying and pressing the engineering spoil to obtain a mud cake, performing wet filtration, centrifugation, drying and grinding on the mud cake in sequence to obtain clay powder, and making the mud cake The clay powder is calcined in a suspended state in air to obtain flash-fired clay, the temperature of the calcination is 850°C-950°C, and the calcination time is 0.5s-1.5s; The preparation method of the mineralized regenerated micropowder specifically includes: mineralizing the regenerated micropowder through a semi-dry method, and then drying and grinding to obtain a mineralized regenerated micropowder. The specific steps of the semidry method mineralization include: The surface of the regenerated fine powder is sprayed with sodium hydroxide solution for wetting, and then placed in an environment with a relative humidity of 80%RH to 100%RH for mineralization. 2. The auxiliary gelling material according to claim 1, characterized in that, the particle size of the particles in the mud cake is less than 2.36mm. 3. The auxiliary gelling material according to claim 1 or 2, characterized in that, the specific steps of wet filtration, drying and grinding are: mixing the mud cake and water according to the mass ratio of 1:20-50 After mixing evenly, use a sieve with a pore size not greater than 25 μm to filter and collect the filtrate, then centrifuge the obtained filtrate and collect the lower layer of fine particle precipitation; air-dry the fine particle precipitation until the water content is less than 5%, and then carry out grinding, filtering Sieve to get clay powder. 4. Auxiliary gelling material as claimed in claim 1, it is characterized in that, the concrete step of described semi-dry method mineralization comprises: spread out described regenerated micro-powder according to the standard that the thickness after flattening is not more than 1mm, according to solid Liquid mass ratio of 0.01 to 0.1, the sodium hydroxide solution is evenly sprayed on the surface of the regenerated micro-powder spread out to make it wet, and then the wetted regenerated micro-powder is placed in a carbon dioxide concentration of 10% to 30% and a temperature of Mineralization is carried out in an environment of 20℃～30℃ and relative humidity of 80%RH～90%RH, and the mineralization time is not less than 1h. 5. The auxiliary gelling material according to claim 1 or 4, characterized in that the concentration of the sodium hydroxide solution is 3g/L˜5g/L. 6. The auxiliary gelling material according to claim 1, characterized in that, the mass ratio of the flash fired clay to the mineralized regenerated fine powder is 1.5-2.2:1. 7. A preparation method of auxiliary gelling material, characterized in that, according to the preparation method of the flash-fired clay in the auxiliary gelling material described in any one of claims 1 to 6 and the preparation method of the mineralized regenerated micropowder The flash fired clay and the mineralized regenerated fine powder are prepared respectively, and the obtained flash fired clay and the mineralized regenerated fine powder are mixed according to the mass ratio of 1.5-2.2:1 to obtain the obtained product. 8. The application of the auxiliary gelling material according to any one of claims 1 to 6 or the auxiliary gelling material prepared by the preparation method according to claim 7 in gelling materials. 9. The use according to claim 8, wherein the cementitious material further comprises cement. 10. The application according to claim 9, characterized in that the mass proportion of cement in the cementitious material is 45%-60%.