Search

CN-121974658-A - Porcelain sand for producing extra-high voltage insulator and preparation method

CN121974658ACN 121974658 ACN121974658 ACN 121974658ACN-121974658-A

Abstract

The invention discloses porcelain sand for producing an extra-high voltage insulator and a preparation method thereof, wherein the porcelain sand comprises the following components of 30-50 parts of formula mud, 13-18 parts of alumina powder, 10-15 parts of glaze powder, 4-9 parts of talcum, 3-8 parts of clay of one type, 5-10 parts of clay of the second type and 4-9 parts of albite, wherein the formula mud comprises 45-60 parts of kaolin, 25-30 parts of quartz sand, 10-15 parts of potassium feldspar, 8-10 parts of bentonite and 0.8-1.2 parts of carboxymethyl cellulose, the preparation method of the porcelain sand comprises the steps of proportioning grinding, magnetic separation iron removing, press filtration dehydration, vacuum pugging, drying sand making and high-temperature sintering, and the porcelain sand has extremely strong high temperature resistance, arc resistance and ageing resistance, can be bonded on the root of an insulator blank body through glue and sintered and formed together with the blank body, so that the root of the insulator can be better connected with a fitting through cement, and the whole mechanical strength and electrical property of the insulator are improved.

Inventors

  • CAO WEIDONG
  • ZHANG ZHENGRONG
  • YU SIFAN

Assignees

  • 湖南湖电电力设备有限公司

Dates

Publication Date
20260505
Application Date
20260114

Claims (7)

  1. 1. The porcelain sand for producing the extra-high voltage insulator is characterized by comprising 30-50 parts of formula mud, 13-18 parts of alumina powder, 10-15 parts of glaze powder, 4-9 parts of talcum, 3-8 parts of clay, 5-10 parts of clay of the second class and 4-9 parts of albite, wherein the formula mud comprises 45-60 parts of kaolin, 25-30 parts of quartz sand, 10-15 parts of potassium feldspar, 8-10 parts of bentonite and 0.8-1.2 parts of carboxymethyl cellulose.
  2. 2. The porcelain sand produced by the extra-high voltage insulator according to claim 1, wherein the clay is hard kaolin with Mohs hardness of 3.6-4.0, and the clay is soft kaolin with sand content of <40, kaolin Dan Chundu > 96.
  3. 3. The porcelain sand produced by the extra-high voltage insulator according to claim 1, wherein the glaze powder comprises 20-25 parts of borax, 15-20 parts of coastal soil, 15-20 parts of zircon sand, 10-15 parts of mica powder and 10-15 parts of silicon carbide.
  4. 4. The porcelain sand for producing extra-high voltage insulators according to claim 1, wherein the alumina powder has a mesh number of 320-325 mesh.
  5. 5. The method for preparing porcelain sand for the production of an extra-high voltage insulator according to any one of claims 1 to 4, wherein the method comprises the steps of: proportioning and grinding, namely weighing each component according to the proportion of raw materials, distributing each component of quartz sand, talcum, feldspar and glaze powder to a jaw crusher for preliminary crushing, and distributing each component to a ball mill for fine grinding until the particle size is less than or equal to 45 mu m, wherein the mass ratio of the material to the ball to the water is 1:2:0.6; Removing iron by magnetic separation, namely removing magnetic impurities in each component by a magnetic separator to ensure that the impurity content is lower than 0.3 percent; Press filtration and dehydration, namely, delivering the mixed components to a plate-and-frame filter press for dehydration, wherein the dehydration pressure is 1.2-1.5MPa; Vacuum pugging, namely pugging by a vacuum pugging machine, wherein the pugging times are more than or equal to 3 times, the extrusion pressure is 4-6MPa, and the pugging plasticity index is controlled to be 2.0-2.2; drying and sand making, namely drying mud strips at 115-120 ℃ for 1.5-2 hours, crushing the dried mud strips into particles, and screening porcelain sand blanks with qualified particle sizes through a vibrating screen in the sand rubbing process; and sintering at high temperature, namely firing the porcelain sand blank by a tunnel kiln, heating to 580-600 ℃ at the speed of 1-2 ℃ per minute, heating to 1200-1250 ℃ at the speed of 8-10 ℃ per minute, maintaining for 2-3 hours, heating to 1325-1350 ℃ rapidly, preserving heat for 4-5 hours, cooling to below 800 ℃ at the speed of 8-10 ℃ per minute, and naturally cooling to room temperature.
  6. 6. The method for preparing porcelain sand for producing extra-high voltage insulators according to claim 5, wherein the mesh number of the porcelain sand blank is controlled to be 12-26 mesh.
  7. 7. The method for preparing porcelain sand for extra-high voltage insulator production according to claim 5, wherein the mud strips obtained after vacuum pugging are subjected to ageing treatment, the mud strips are placed in an environment with the humidity of 85-90% and the temperature of 20-26 ℃ for 72-96 hours, and the section of the aged mud is free from bubbles and layering.

Description

Porcelain sand for producing extra-high voltage insulator and preparation method Technical Field The invention relates to the technical field of electroceramics equipment, in particular to porcelain sand for producing an extra-high voltage insulator and a preparation method thereof. Background The extra-high voltage insulator is core insulating equipment for transmission lines with voltage levels of 1000 kilovolts and above, and bears multiple tasks of supporting wires, isolating current and resisting complex environmental corrosion. As a 'safety guard' of an extra-high voltage power grid, the extra-high voltage insulator needs to bear tens of tons of wire tension and lightning impulse voltage, and each inch of design needs to meet the requirements of extreme electrical and high-strength mechanical properties. Therefore, how to improve the structure of the extra-high voltage insulator further improves the electrical and mechanical properties of the extra-high voltage insulator becomes an important research direction of the insulator, wherein the connection mode of the root of the insulator and the hardware becomes one of the important research points. The root of the traditional insulator is generally connected with the hardware fitting through cement, but the method is cheap and practical, because the insulator connecting surface is smooth, when the insulator cylinder is impacted by larger torque, the root of the insulator can possibly fall off from the cement seat, so that the whole insulator is damaged, and a method for increasing the friction force of the root of the insulator is needed to solve the problems. Disclosure of Invention The invention provides porcelain sand for producing an extra-high voltage insulator, which comprises, by weight, 30-50 parts of formula mud, 13-18 parts of alumina powder, 10-15 parts of glaze powder, 4-9 parts of talcum, 3-8 parts of clay, 5-10 parts of clay of a class II and 4-9 parts of albite, wherein the formula mud comprises, by weight, 45-60 parts of kaolin, 25-30 parts of quartz sand, 10-15 parts of potassium feldspar, 8-10 parts of bentonite and 0.8-1.2 parts of carboxymethyl cellulose. Further, one type of clay is hard kaolin with Mohs hardness of 3.6-4.0, and the other type of clay is soft kaolin with sand content of <40% and kaolin Dan Chundu > 96. Further, the glaze powder comprises 20-25 parts of borax, 15-20 parts of coastal soil, 15-20 parts of zircon sand, 10-15 parts of mica powder and 10-15 parts of silicon carbide. Further, the alumina powder has a mesh number of 320-325 mesh. The invention also provides a preparation method of the porcelain sand, which comprises the following steps: proportioning and grinding, namely weighing each component according to the proportion of raw materials, distributing each component of quartz sand, talcum, feldspar and glaze powder to a jaw crusher for preliminary crushing, and distributing each component to a ball mill for fine grinding until the particle size is less than or equal to 45 mu m, wherein the mass ratio of the material to the ball to the water is 1:2:0.6; Removing iron by magnetic separation, namely removing magnetic impurities in each component by a magnetic separator to ensure that the impurity content is lower than 0.3 percent; Press filtration and dehydration, namely, delivering the mixed components to a plate-and-frame filter press for dehydration, wherein the dehydration pressure is 1.2-1.5MPa; Vacuum pugging, namely pugging by a vacuum pugging machine, wherein the pugging times are more than or equal to 3 times, the extrusion pressure is 4-6MPa, and the pugging plasticity index is controlled to be 2.0-2.2; drying and sand making, namely drying mud strips at 115-120 ℃ for 1.5-2 hours, crushing the dried mud strips into particles, and screening porcelain sand blanks with qualified particle sizes through a vibrating screen in the sand rubbing process; and sintering at high temperature, namely firing the porcelain sand blank by a tunnel kiln, heating to 580-600 ℃ at the speed of 1-2 ℃ per minute, heating to 1200-1250 ℃ at the speed of 8-10 ℃ per minute, maintaining for 2-3 hours, heating to 1325-1350 ℃ rapidly, preserving heat for 4-5 hours, cooling to below 800 ℃ at the speed of 8-10 ℃ per minute, and naturally cooling to room temperature. Further, the mesh number of the porcelain sand blank is controlled to be 12-26 meshes. Further, the mud strips obtained after vacuum pugging are subjected to ageing treatment, the mud strips are placed in an environment with the humidity of 85-90 ℃ and the temperature of 20-26 ℃ for 72-96 hours, and the section of the mud material after ageing is free from bubbles and layering. The ceramic sand prepared by the method has the advantages that the ceramic sand has extremely strong high temperature resistance, arc resistance and ageing resistance, can be adhered to the root of the insulator blank through glue and is sintered and formed together with the blank, so that the su