Unlock instant, AI-driven research and patent intelligence for your innovation.

Coil cement for intermediate frequency induction furnace and preparation method thereof

A technology of coil cement and induction furnace, applied in the field of refractory materials for medium frequency induction furnace, can solve the problems of easy cracking and breakage, high calcium content, reduced production efficiency, etc., and achieves improvement of medium and low temperature performance, good volume stability, The effect of low production cost

Active Publication Date: 2019-04-09
LENGSHUIJIANG HUAKE PERFORMANCE MATERIALS
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current coil cement mostly uses high-purity corundum as raw material, but high-purity corundum is expensive
High-purity corundum-based coil cement has poor thermal shock resistance, and is prone to cracks and damage during use, requiring frequent repairs, which not only reduces production efficiency, but also weakens the protective effect on the coil
[0005] The literature (Wu Bin. Research on the use of titanium-containing slag to prepare intermediate frequency furnace coil cement. Proceedings of the 2011 National Academic Conference on Unshaped Refractory Materials, 2011, 455~458) introduces a method for preparing coil cement by using titanium dioxide-containing industrial slag. The main defect is: the calcium content in industrial slag is too high, dicalcium silicate will be produced during the use of cement, and the transition between different crystal phases of dicalcium silicate will cause the pulverization of the material, which seriously affects the safe use of the material
The patented technology of "a cement for intermediate frequency furnace lining" (CN104030704 A) and the patented technology of "a preparation method of cement for intermediate frequency furnace" (CN104030703 A) both use brown corundum as the main raw material, and the price of brown corundum is relatively high. The production cost of cement is high; the literature (Dai Xilong et al. Preparation and application of refractory cement for coreless induction furnace. Casting, 2006.55 (5), 528~529) uses dense fused corundum, activated alumina micropowder and pure calcium aluminate Cement is used as raw material to prepare refractory mortar, and the fused corundum used has poor thermal shock resistance, and the production cost of the prepared refractory mortar is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A coil cement for an intermediate frequency induction furnace and a preparation method thereof. 35~40wt% bauxite clinker, 19~24wt% calcined forsterite, 6~10wt% corundum fine powder, 1~2wt% silica powder, 10~12wt% α-Al 2 o 3 Micropowder, 20-22wt% aluminate cement and 0.1-0.15wt% water reducer are used as raw materials, and mixed evenly to obtain coil cement for intermediate frequency induction furnace.

[0026] The water reducing agent described in this embodiment is sodium tripolyphosphate.

[0027] The amount of water added in this example is 17~17.6wt%, and the volume density of the prepared intermediate frequency induction furnace coil cement is 2.3~2.33g / cm after being treated at 110°C for 24h. 3 , the apparent porosity is 31~33%, the flexural strength is 5~5.6MPa, the compressive strength is 24~27MPa; the bulk density measured after 800℃×3h treatment is 2.2~2.23g / cm 3 , The apparent porosity is 33~35%, the linear change rate is -0.2~0%, the flexural strength is ...

Embodiment 2

[0029] A coil cement for an intermediate frequency induction furnace and a preparation method thereof. With 40~45wt% bauxite clinker, 14~19wt% calcined forsterite, 10~14wt% corundum fine powder, 2~3wt% silica powder, 8~10wt% α-Al 2 o 3 Micropowder, 18~20wt% aluminate cement and 0.15~0.2wt% water reducing agent are used as raw materials, which are uniformly mixed.

[0030] The water reducer described in this example is sodium hexametaphosphate.

[0031] The amount of water added in this example is 16.4~16.9wt%, and the volume density of the prepared intermediate frequency induction furnace coil cement is 2.35~2.38g / cm after being treated at 110°C for 24h. 3 , the apparent porosity is 30~32%, the flexural strength is 6.2~6.8MPa, the compressive strength is 25~29MPa; the bulk density measured after 800℃×3h treatment is 2.2~2.24g / cm 3 , The apparent porosity is 32~34%, the linear change rate is -0.18~0%, the flexural strength is 4~4.5MPa, and the compressive strength is 21~26MP...

Embodiment 3

[0033] A coil cement for an intermediate frequency induction furnace and a preparation method thereof. With 45~50wt% bauxite clinker, 9~14wt% calcined forsterite, 14~18wt% corundum fine powder, 3~4wt% silica powder, 6~8wt% α-Al 2 o 3 Micropowder, 16~18wt% aluminate cement and 0.2~0.25wt% water reducing agent are used as raw materials, which are uniformly mixed.

[0034] The water reducing agent described in this embodiment is melamine.

[0035] The amount of water added in this example is 15.6~16wt%, and the volume density of the prepared intermediate frequency induction furnace coil cement is 2.38~2.41g / cm after being treated at 110°C for 24h. 3 , the apparent porosity is 28~30%, the flexural strength is 7.6~8.1MPa, the compressive strength is 26~31MPa; the bulk density measured after 800℃×3h treatment is 2.23~2.27g / cm 3 , The apparent porosity is 30~32%, the linear change rate is -0.17~0%, the flexural strength is 4.3~4.8MPa, and the compressive strength is 23~28MPa.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to coil cement for a medium-frequency induction furnace and a preparation method of the coil cement. According to the technical scheme, the coil cement for the medium-frequency induction furnace is prepared by uniformly mixing the following raw materials by weight percent: 35 to 55 percent of calcined bauxite, 4 to 24 percent of calcined forsterite, 6 to 20 percent of corundum fine powder, 1 to 5 percent of silicon dioxide micro powder, 4 to 12 percent of alpha-Al2O3 micro powder, 12 to 22 percent of aluminate cement and 0.1 to 0.3 percent of a water reducing agent. The particle size of the calcined forsterite is 0.088 to 1mm; and the content of MgO in the calcined forsterite is greater than 42 percent, and the content of Fe2O3 in the calcined forsterite is less than or equal to 10 percent. The particle size of the calcined bauxite is 0.088 to 3mm, and the content of Al2O3 in the calcined bauxite is 75 to 90 percent. The particle size of the silicon dioxide micro powder is less than 10 microns, and the content of SiO2 in the silicon dioxide micro powder is greater than or equal to 92 percent. The particle size of the corundum fine powder is less than 0.088mm, and the content of Al2O3 in the corundum fine powder is 94 to 99.5 percent. The prepared coil cement for the medium-frequency induction furnace has the characteristics of good volume stability, high strength and long service life.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for intermediate frequency induction furnaces. Specifically relates to a coil cement for an intermediate frequency induction furnace and a preparation method thereof. technical background [0002] Forsterite not only has large reserves and low price, but also has the characteristics of high refractoriness, good insulation, good thermal stability and strong slag resistance. It is an excellent refractory raw material. [0003] The coil glue is coated around the coil to insulate and protect the coil. With the increasingly harsh smelting conditions of intermediate frequency induction furnaces, the insulation, refractoriness, thermal shock stability, volume stability and heat preservation of coil cement are all required to develop in a better direction. [0004] The current coil cement mostly uses high-purity corundum as raw material, but high-purity corundum is expensive. High-purity c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/3418C04B2235/3445C04B2235/5436
Inventor 袁聪李远兵余东寿袁添翼周伟强
Owner LENGSHUIJIANG HUAKE PERFORMANCE MATERIALS