CN-120518349-B - Preparation method of artificial aggregate

Abstract

The invention relates to the technical field of industrial solid waste resource utilization and artificial aggregate, in particular to a preparation method of artificial aggregate. The concrete technical scheme is that the method comprises the following steps of (1) grinding and sieving slag, fly ash and red mud, heating, adding an exciting agent, mixing to obtain slurry, and (2) heating the slurry at high temperature to coagulate the slurry, extruding and granulating, rounding, curing, soaking in alkali liquor, and curing again to obtain the artificial aggregate. The invention solves the problem of larger pores of spherical particles produced by disc granulation in the prior art.

Inventors

• ZHANG MAOHUA
• WANG SHIMIN
• ZHANG SHOUCHUN
• YIN YUQI
• REN ZIHAO

Assignees

• 北京科技大学

Dates

Publication Date

20260508

Application Date

20250527

Claims (6)

1. 1. The preparation method of the artificial aggregate is characterized by comprising the following steps of: (1) Grinding and sieving slag, fly ash and red mud, heating, adding an exciting agent, and mixing to obtain slurry; (2) Heating the slurry at 50-90 ℃ to coagulate the slurry, extruding and granulating, rounding, curing, soaking in alkali liquor, and curing again to obtain the artificial aggregate; in the step (1), the slag is more than or equal to 70 parts, the fly ash is 5-20 parts, the red mud is 5-10 parts, and the molar ratio of calcium to silicon in the whole component is more than 1.2 according to 100 parts by weight.
2. 2. The method for preparing artificial aggregate according to claim 1, wherein the alkali-exciting agent is 5-10% by mass of Na 2 O, and the alkali-exciting agent is one or a combination of sodium hydroxide, sodium carbonate and sodium silicate.
3. 3. The method for preparing artificial aggregate according to claim 2, wherein in the step (1), the heating treatment is performed at 20 to 50 ℃ for 20 to 50 minutes.
4. 4. The method of producing an artificial aggregate according to claim 2, wherein in the step (2), the slurry is put into an auxiliary granulating apparatus after being left to stand, and coagulated at 50 to 90 ℃, extruded and granulated after coagulation, and granulated by spheronization, and the granules are cured for 1 to 3 days in an environment having a temperature of 15 to 25 ℃ and a humidity of more than 90%, then soaked in a 5 to 10% sodium hydroxide solution or sodium silicate having a modulus of 1, and further cured under the same conditions after being fished out.
5. 5. A method for producing an artificial aggregate according to claim 4, wherein the disc tilt angle is 0 to 20℃during the spheronization and granulation.
6. 6. The method of claim 4, wherein the slurry is heated by electric heating or water bath heating.

Description

Preparation method of artificial aggregate Technical Field The invention relates to the technical field of industrial solid waste resource utilization and artificial aggregate, in particular to a preparation method of artificial aggregate. Background In the modern process, the demand for non-renewable resources such as ore resources, energy sources, soil resources and the like is increased increasingly, so that the accumulated stockpiling of various industrial solid wastes exceeds 620 hundred million tons, a large amount of land is occupied for the accumulation and storage of the industrial solid wastes, and the problems of environment, safety and the like are brought. Meanwhile, the requirement for concrete is extremely high, so that aggregates in the concrete are in a state of extremely rapid consumption. In order to reduce exploitation and utilization of natural aggregate and simultaneously alleviate a series of problems caused by solid waste, new technology is urgently needed to promote large-scale, high-value and green application of the solid waste. In the prior art of the patent technology using solid waste granulation, two processes of granulation and curing hardening are usually included, wherein spherical artificial aggregate is usually prepared by a disc method in the granulation process, and irregular artificial aggregate is usually prepared by mechanical crushing. The curing hardening process usually adopts the modes of alkali liquor soaking, high-temperature steam curing, accelerated carbonization and the like. The spherical artificial aggregate can better meet the demands of stress and slurry fluidity in morphology, but is influenced by a granulating mode, so that the prepared aggregate has larger water absorption, and more unhydrated substances exist, so that the mechanical property of the aggregate is not excellent. The existing patent (such as China patent with application numbers 202110484019.8, 201910611978.4, 202011103706.2 and 202311699130.4) is to put industrial solid waste, cement and other dry powder into a disc granulator, and spray an excitant or water to enable powder particles to be balled. In addition, the irregular aggregate is prepared by mechanical crushing, the prepared aggregate is damaged in the crushing process, so that more microcracks exist in the aggregate, the strength is greatly reduced, the needle-shaped aggregate is more, the disadvantages of stress and slurry fluidity exist, and more secondary micro powder is generated in the crushing process. Thus, new technical measures are also needed to promote the development of artificial aggregates. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a preparation method of artificial aggregate, which solves the problem of larger pores of spherical particles produced by disc granulation in the prior art. In order to achieve the above purpose, the invention is realized by the following technical scheme: the invention discloses a preparation method of artificial aggregate, which comprises the following steps: (1) Grinding and sieving slag, fly ash and red mud, heating, adding an exciting agent, and mixing to obtain slurry; (2) And (3) heating the slurry at high temperature to coagulate the slurry, extruding and granulating, rounding, curing, soaking in alkali liquor, and curing again to obtain the artificial aggregate. Preferably, in the step (1), slag is more than or equal to 70 parts, fly ash is 5-20 parts, red mud is 5-10 parts, and the molar ratio of calcium to silicon in the whole component is more than 1.2. Preferably, the exciting agent is an alkaline exciting agent, the dosage of the alkaline exciting agent is 5-10%, and the alkaline exciting agent is one or a combination of sodium hydroxide, sodium silicate, sodium carbonate and sodium silicate. Preferably, in the step (1), the heating treatment is performed at 20-50 ℃ for 20-50 min. Preferably, in the step (2), the slurry is added into auxiliary granulating equipment after standing, is coagulated at 50-90 ℃, is extruded and granulated after coagulation, is granulated by rolling, is cured for 1-3 days in an environment with the temperature of 15-25 ℃ and the humidity of more than 90%, is soaked in 5-10% sodium hydroxide solution or sodium silicate with the modulus of 1, and is continuously cured under the same conditions after being fished out. Preferably, the disc inclination angle is 0-20 degrees during the spheronization process. Preferably, the slurry is heated by electric heating or water bath heating. The invention has the following beneficial effects: 1. the invention is based on the characteristic that the setting speed of the alkali-activated gel material is greatly influenced by temperature, and is used for preparing the artificial aggregate. The preparation method comprises the steps of exciting potential chemical activity of raw materials in a grinding and heating mode, heating the prepared slurry by adopting auxiliary