Low-alkalinity crystallizer covering slag prepared from building waste clay

A technology for mold mold powder and construction waste is applied in the field of low alkalinity mold mold mold powder, which can solve the problems of crushing, affecting the uniformity and integrity of mold powder particles, and achieve the effects of reducing production costs, saving costs, and simple processing.

Active Publication Date: 2011-11-09
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the mold slag made of wollastonite and bauxite as the main raw materials is prone to breakage during transportation, which affects the uniformity and integrity of its mold slag particles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Low-alkalinity crystallizer mold slag using construction waste clay as raw material, the mass percentage of its raw material components is: clay 35%, fluorite 13%, limestone 24%, sodium carbonate 8%, magnesium oxide 3%, carbon Black 2%, graphite 14%, binder 1%. Mold flux chemical composition: CaO 28.9%, SiO 2 33.6%, Na 2 O 4.82%, F - 8.68%, MgO 2.8%, Al 2 o 3 4.12%, Fe 2 o 3 0.93%, solid carbon C 15.5%. Mold flux physical properties: basicity (CaO / SiO 2 ) 0.86, melting point 1060°C, viscosity (1300°C) 0.39Pa·S, melting speed 36 seconds, moisture ≤0.3%.

Embodiment 2

[0018] Low-alkalinity crystallizer mold slag using construction waste clay as raw material, the mass percentage of its raw material components is: clay 48%, fluorite 9%, limestone 17%, sodium carbonate 11%, magnesium oxide 1%, carbon Black 3%, graphite 10%, binder 1%. Mold flux chemical composition: CaO 25.9%, SiO 2 30.6%, Na 2 O 5.8%, F - 8.2%,MgO 2.5%,Al 2 o 3 4.62%, Fe 2 o 3 0.93%, solid carbon C 17.8%. Mold flux physical properties: basicity (CaO / SiO 2 ) 0.85, melting point 1030°C, viscosity (1300°C) 0.48Pa·S, melting speed 42 seconds, moisture ≤0.3%.

Embodiment 3

[0020] The low-alkalinity crystallizer mold slag using construction waste clay as raw material has the following raw material components: 40% clay, 11% fluorite, 20% limestone, 11% sodium carbonate, 2% magnesium oxide, carbon 4% black, 10% graphite, 2% binder. A low-alkalinity crystallizer mold slag using construction waste clay as raw material, the mass percentage of the main chemical components is as follows: The main chemical components of the low-alkalinity mold slag are CaO 27%, SiO 2 28%, MgO 2%, Al 2 o 3 5%, Na 2 O 8%, F - 7%, Fe 2 o 3 2%, solid carbon C 12%. Mold flux physical properties: basicity (CaO / SiO 2 ) 0.96, melting point 1030°C, viscosity (1300°C) 0.48Pa·S, melting speed 42 seconds, moisture ≤0.3%.

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Abstract

The invention discloses low-alkalinity crystallizer covering slag prepared from building waste clay. The low-alkalinity crystallizer covering slag comprises the following raw material components in percentage by mass: 30 to 55 percent of clay, 8 to 15 percent of fluorite, 15 to 30 percent of lime stone, 8 to 15 percent of sodium carbonate, 1 to 3 percent of magnesium oxide, 2 to 4 percent of carbon black, 5 to 15 percent of graphite and 1 to 3 percent of binder. The covering slag prepared from the clay serving as a main material can maintain the complete granules of the hollow covering slag, has good heat-preserving effect in the using process and is melted uniformly without caking so as to guarantee to introduce molten slag uniformly and smoothly, effectively control the heat transfer ofa crystallizer, avoid the caking of the crystallizer and a blank shell and improve the external quality of cast blanks.

Description

[0001] technical field [0002] The invention belongs to the technical field of auxiliary materials for steelmaking, in particular to a low-alkalinity crystallizer mold slag using construction waste clay as a raw material. technical background [0003] Mold slag plays a role in lubrication, heat preservation, prevention of secondary oxidation of molten steel, adsorption of floating inclusions and regulation of heat flow to the crystallizer in the continuous casting process. Mold flux composition is based on CaO-SiO 2 -Al 2 o 3 The pseudo-wollastonite region in the ternary system selects the composition of each component, and CaO is the main alkaline material in the components that constitute the mold flux, and SiO 2 As the main acidic material, Na 2 O, CaF 2 , MgO as the main flux, carbonaceous components as the skeleton material and melting rate control agent. Through the organic combination of base material and flux, the chemical composition of the mold flux is adjus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/07B22D11/111
Inventor 张令李党军朱云峰
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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