A carbon-bonded magnesium-silicon-calcium gunning material for steelmaking electric furnace maintenance

A technology of gunning material and magnesium silicon, which is applied in the field of refractory materials for steelmaking electric furnace maintenance, can solve problems such as unsatisfactory service life, general use effect, and reduced corrosion resistance, so as to reduce peeling, reduce quantity, and improve steel quality. quality effect

Active Publication Date: 2017-09-19
何宇智 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main raw material of magnesia gunning material is magnesia (from magnesite, resource shortage), high cost, used in domestic (for magnesium products with MgO>70%, the state implements export license quota management, the market price is 600 yuan / tons, the export of such products is restricted), and the effect is average; forsterite-based gunning material uses cheap olivine clinker (obtained by light burning of boron gangue minerals) to replace about 50% of magnesia (MgO<70 %, no export quota), thereby reducing the dependence on magnesium resources, but the corrosion resistance is also reduced, so the service life is not ideal, because of its high cost performance, it still has a certain advantage in export products
Generally speaking, what is currently lacking at home and abroad is the effective and cost-effective electric furnace gunning material

Method used

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  • A carbon-bonded magnesium-silicon-calcium gunning material for steelmaking electric furnace maintenance
  • A carbon-bonded magnesium-silicon-calcium gunning material for steelmaking electric furnace maintenance

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Preparation of carbon-bonded magnesium-silicon-calcium gunning material XHPB-C10 for steelmaking electric furnace maintenance:

[0039] 1) Raw material crushing, screening and fine grinding: the limestone is crushed in a crusher to make particles with a particle size of 1mm≤particle size90% magnesia in a crusher or Raymond machine to make particles of 0.074mm≤particle size<1mm and particles with a particle size<0.074 mm particles.

[0040] 2) Proportion mixing and packaging: Add 10 parts of limestone granules with 1mm≤particle size90% magnesia 0.074mm≤particle size<1mm, and 22.5 parts of granular materials with a particle size of<0.074mm In addition, 9.2 parts of binder are added; after mixing evenly, it is completed through steps such as detection and packaging.

[0041] In this example, the binder is composed of the following components in parts by weight: 5 parts of asphalt with a particle size of ≤1 mm, 2.5 parts of slaked lime with a particle size of ≤400 mesh, 1....

Embodiment 2

[0043] Preparation of carbon-bonded magnesium-silicon-calcium gunning material XHPB-C10-45 for steelmaking electric furnace maintenance:

[0044] 1) Raw material crushing, screening and fine grinding: the limestone is crushed in a crusher to make particles with a particle size of 1 mm ≤ particle size 85% magnesia in a crusher or Raymond machine to make particles greater than or equal to 0.074mm ≤ particle size < 1mm And particles with a particle size <0.074mm.

[0045] 2) Proportion mixing and packaging: add 10 parts of limestone granules with 1mm≤particle size85% magnesia, In addition, 9.2 parts of binding agent are added; after mixing evenly, it is completed through steps such as detection and packaging.

[0046]In this example, the binder is composed of the following components by weight: 5 parts of asphalt with a particle size of ≤1mm, 2.5 parts of slaked lime with a particle size of ≤400 mesh, 1.0 part of microsilica powder, 0.5 part of hydroxypropyl methylcellulose, so...

Embodiment 3

[0048] Preparation of carbon-bonded magnesium-silicon-calcium gunning material XHPB-C20 for steelmaking electric furnace maintenance:

[0049] 1) Raw material crushing, screening and fine grinding: the limestone is crushed in a crusher to make particles with a particle size of 1 mm ≤ particle size 90% magnesia in a crusher or a Raymond machine to make particles with a particle size of <0.074mm respectively.

[0050] 2) Proportion mixing and packaging: add 10 parts of limestone granules with 1mm≤particle size90% magnesia and smaller than 0.074mm, and 9.2 parts of a binder; The steps of detection and packaging are completed.

[0051] The binder in this example is composed of the following components in parts by weight: 5 parts of asphalt with a particle size of ≤1mm, 2.5 parts of slaked lime with a particle size of ≤400 mesh, 1.0 part of microsilica powder, 0.5 part of hydroxypropyl methylcellulose, lauryl sulfuric acid Sodium 0.2 parts.

[0052] The typical values ​​of the ph...

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Abstract

The invention relates to a carbon-bonded magnesium-silicon-calcium gunning material for steelmaking electric furnace maintenance, which is composed of the following components in proportion by weight: 20 to 25 parts of limestone with a particle size of 0.2mm≤<5mm; limestone with a particle size of 0.2mm≤<5mm 45 to 47.5 parts of lightly burnt olivine; 20 to 27.5 parts of magnesia with a particle size of <1mm; 9.2 parts of binder; wherein the binder is composed of the following components by weight: 5 parts of asphalt with a particle size of ≤1mm, 2.5 parts of slaked lime with a particle size of ≤400 mesh part, 1.0 part of silicon micropowder, 0.5 part of hydroxypropyl methylcellulose, and 0.2 part of sodium lauryl sulfate; the present invention adopts a binder with carbon as the main component to suppress slag invasion and overburning, and it is better than ordinary gunning material It is more resistant to corrosion; limestone and slaked lime are used as calcium sources, which are resistant to hydration and can purify molten steel; the amount of magnesia used in raw materials is small, which can save resources and reduce costs.

Description

technical field [0001] The invention relates to the technical field of refractory materials for steelmaking electric furnace maintenance, in particular to a carbon-bonded magnesium-silicon-calcium gunning material for steelmaking electric furnace maintenance. Background technique [0002] Modern electric furnace steelmaking adopts new technologies such as eccentric bottom tapping (EBT), steel retention operation, hot charging of molten iron, and enhanced oxygen blowing of the furnace door oxygen lance, which has the characteristics of high efficiency and fast pace, but at the same time causes poor working conditions for the furnace lining (molten steel and slag on the furnace lining, which can easily lead to damage to the furnace lining), low furnace age, and long shutdown maintenance time. The furnace lining gunning technology is used to carry out hot or cold repairs on the slag line and furnace slope corrosion. The most effective way to prolong the service life of electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 何宇智张晓樵
Owner 何宇智
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