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CN-122010439-A - Light granule and preparation method thereof

CN122010439ACN 122010439 ACN122010439 ACN 122010439ACN-122010439-A

Abstract

The invention discloses a light granule and a preparation method of the light granule. The preparation method comprises the steps of material preparation, collecting a preset raw material with the particle size of less than 75 mu m from a preset silt raw material, strip making, extrusion granulating, and sintering, wherein the preset raw material is prepared into at least one mud strip without additionally adding or mixing a foaming agent or a gas generating substance, the at least one mud strip is extruded and granulated into a plurality of raw material balls with the particle size ranging from 2mm to 30 mm in average value under the vacuum condition, and the raw material balls without additionally adding or mixing the foaming agent or the gas generating substance are sequentially sintered into a plurality of light-weight granules in a rotary kiln through a preheating section, a sintering section and a cooling section. The predetermined sintering temperature of the sintering section falls between 1120 ℃ and 1160 ℃.

Inventors

  • Lai Congming
  • Lan Longkuan

Assignees

  • 兴磊资源回收股份有限公司
  • 赖聪铭
  • 蓝隆宽

Dates

Publication Date
20260512
Application Date
20251111
Priority Date
20241111

Claims (20)

  1. 1. A process for the preparation of lightweight pellets characterized by the steps of: A material preparation step of collecting a predetermined raw material having a particle diameter of 75 μm or less from a predetermined silty raw material; a slivering step of preparing the predetermined raw material into at least one mud strip without adding or mixing a foaming agent or a foaming substance; An extrusion granulating step of extruding and granulating the at least one mud strip under a vacuum condition into a plurality of raw material balls having a predetermined particle size with an average value within a particle size range of 2-30 mm, and A sintering step of sequentially passing the green pellets without the foaming agent or the foaming material added or mixed therein through a preheating section, a sintering section and a cooling section in a rotary kiln to sinter them into a plurality of light pellets, wherein a predetermined sintering temperature of the sintering section is from 1120 ℃ to 1160 ℃.
  2. 2. The preparation method according to claim 1, wherein the predetermined silt material is a material of which the soil texture code is B1 to B7.
  3. 3. The method of claim 1, wherein the predetermined silty material is from a construction of a residual earth and stone.
  4. 4. The method according to claim 1, wherein the predetermined sintering temperature of the sintering section in the sintering step is 1130 ℃ to 1150 ℃.
  5. 5. The method according to claim 4, wherein the predetermined sintering temperature of the sintering section in the sintering step is 1150 ℃.
  6. 6. The method of claim 1, wherein the raw pellets pass through the rotary kiln for no more than 15 minutes during the sintering step.
  7. 7. The method of claim 1, further comprising, prior to the sintering step, mixing the green pellets with a predetermined powder material to at least partially attach or coat the surfaces of the green pellets with the predetermined powder material.
  8. 8. The method of claim 7, wherein the predetermined powder material comprises silicon oxide.
  9. 9. The method of manufacturing according to claim 8, wherein the predetermined powder material comprises silica.
  10. 10. The method of manufacturing according to claim 9, wherein the predetermined powder material is silicon powder.
  11. 11. The method according to claim 1, wherein in the extrusion granulating step, the at least one mud strand is extrusion-granulated under the vacuum condition into the plurality of raw pellets having the predetermined particle diameter in a particle diameter range of 4 to 25mm on average.
  12. 12. The method of claim 1, further comprising a pretreatment step prior to the extrusion granulating step, the pretreatment step comprising maintaining the mud strip in a pre-vacuum state.
  13. 13. The method according to claim 12, wherein the vacuum condition is to maintain at least one mud strip in the pre-vacuum state, and in the extrusion granulating step, the at least one mud strip is extrusion granulated into the plurality of raw pellets under the vacuum condition.
  14. 14. The method according to claim 12, wherein the pre-vacuum state is a vacuum degree of evacuating the vacuum pug mill to 70% or more.
  15. 15. The method according to claim 14, wherein the pre-vacuum state is a vacuum degree of evacuating the vacuum pug mill to 76% or more.
  16. 16. The method of claim 12, wherein the pre-treatment step comprises drying the slivers to reduce the water content of the slivers to 12% and then performing a subsequent extrusion granulation step.
  17. 17. Lightweight aggregate as a mix aggregate for the preparation of concrete for construction, characterized in that the lightweight aggregate is produced by the preparation method of claim 1.
  18. 18. The lightweight pellet as in claim 17, wherein the lightweight pellet has a specific gravity of 2 or less and a barrel crush strength of 15 MPa or more.
  19. 19. The lightweight pellet of claim 18, wherein the lightweight pellet has a barrel crush strength of 20 or more MPa.
  20. 20. The lightweight pellet of claim 17, wherein the interior of the lightweight pellet has a plurality of voids and the exterior surface of the lightweight pellet has a roughness less than the roughness of the interior of any plane the lightweight pellet is cut through.

Description

Light granule and preparation method thereof Technical Field The invention relates to a light granule and a preparation method of the light granule. In particular to a light granule with the cylinder pressure degree not less than 15 MPa and a preparation method of the light granule. Background Natural sand resources are widely used in a variety of modern industries such as, but not limited to, construction engineering, gardening substrates, and the like. As described above, with the excessive exploitation of natural sand resources and the vigorous development of various industries, the yield of natural sand resources is gradually unable to meet the increasing demands, and related industries are difficult to continue to develop or the industrial cost required to be paid is continuously increased. In addition, the extraction and removal of natural sand resources from the natural environment may cause changes to the terrain and may thus pollute the environment, alter the ecosystem, or cause earth and stone currents. In addition, industrial pollution or industrial noise is easily generated in the mining process, so that natural environment or surrounding residents are affected. Therefore, in order to save natural resources, protect the environment, reduce the negative effects of the mining process, and meet the needs of various industries, it is necessary to develop and manufacture artificial sand having properties similar to or at least usable in place of natural sand. Disclosure of Invention Aiming at the defects and shortcomings in the prior art, the invention aims to provide a light plasmid material and a preparation method thereof. In order to achieve the above purpose, the invention adopts the following technical scheme: A process for producing lightweight pellets, which comprises a material preparation step of collecting a predetermined raw material having a particle diameter of 75 μm or less from a predetermined powdery raw material, a strand forming step of forming at least one strand from the predetermined raw material without adding or mixing a foaming agent or a gas generating substance, an extrusion granulating step of extrusion granulating the at least one strand under a vacuum condition into a plurality of green pellets having a particle diameter in a range of 2 to 30 mm on average, and a sintering step of sintering the green pellets without adding or mixing a foaming agent or a gas generating substance in a rotary kiln in this order through a preheating section, a sintering section and a cooling section to obtain a plurality of lightweight pellets, wherein a predetermined sintering temperature of the sintering section is 1120 to 1160 ℃. The lightweight aggregate used as the mixing aggregate for preparing the concrete for the building is prepared by the preparation method. Efficacy against the prior art According to the lightweight aggregate and the preparation method of the lightweight aggregate provided by the embodiments of the invention, the artificial sand with partial properties which are the same as or similar to natural sand and are more convenient to prepare can be prepared, or at least the artificial sand with the application which can partially replace the natural sand can be prepared and can be industrially utilized. Further, according to the lightweight pellets and the method for producing lightweight pellets provided in the embodiments of the present invention, lightweight pellets having a specific gravity of 2 or less but a cylinder pressure of 15MPa or more can be produced. As mentioned above, the lightweight aggregate has significantly higher strength than natural sand and can be used in the construction industry as a mix aggregate for preparing concrete for construction. As described above, the construction constructed of the lightweight aggregate can exhibit lightweight but strong construction characteristics with respect to natural sand, and can further improve characteristics such as shock resistance. Drawings Fig. 1 is a schematic flow chart of a method for preparing lightweight pellets according to an embodiment of the invention. Fig. 2 is an illustrative schematic diagram showing details of a process flow of a method for producing lightweight pellets according to still another embodiment of the invention. Fig. 3 is a substantial illustration photograph of green pellets to be sintered after being dried in the method of manufacturing lightweight pellets according to the first embodiment of the present invention. Fig. 4 is a substantial illustration photograph of the green pellets of fig. 3 after sintering in a method of manufacturing lightweight pellets according to a first embodiment of the present invention. Fig. 5 is a cross-sectional illustration photograph of a lightweight pellet prepared via a method of preparing lightweight pellets according to a second embodiment of the present invention. Fig. 6 is a cross-sectional illustration photograph of a lightweight pellet pre