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A kind of drainage sand and its preparation method and application

A technology of drainage sand and chrome sand, which is applied in the field of steelmaking auxiliary materials, can solve the problems of thickened sintering layer of drainage sand, unsatisfactory drainage sand, and self-opening of drainage, so as to avoid sticky sand defects, good casting effect, and improve The effect of self-opening rate

Active Publication Date: 2021-08-27
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, due to the development of the iron and steel industry in domestic or international markets, there are more and more manufacturers of smelting steel types. Due to the particularity of steel types, the tapping temperature and molten steel composition after converter smelting are different from conventional steel types. difference, so that the molten steel enters the ladle and contacts the drainage sand added to the ladle nozzle, or reacts, or the sintering layer of the drainage sand is thickened due to the tapping temperature or the subsequent refining treatment of the molten steel, so that when the ladle is poured due to the hydrostatic pressure It is not enough to crush the sintered layer, causing the drainage to fail to open automatically, causing accidents such as unplanned shutdown or production interruption
Conventional drainage sand can no longer meet the current outstanding problems

Method used

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preparation example Construction

[0065] In addition, the present application also provides a method for preparing the above-mentioned drainage sand, for example, may include the following steps: mixing raw materials with water, followed by baking.

[0066] In an optional embodiment, the preparation includes: mixing zircon sand, quartz sand, chrome sand, carbonaceous lubricant, sintering agent and water, followed by baking.

[0067] In a preferred embodiment, the preparation may include: mixing water with raw materials other than chrome sand; mixing the premix and chrome sand while baking.

[0068] It is worth noting that in this application, it is preferred to mix other raw materials with chrome sand in the process of adding raw materials. The reason is: considering the large difference in specific gravity among various materials, chrome sand has the largest specific gravity. The more serious the tendency is, so adding it later can slow down the tendency of melting.

[0069] In an optional embodiment, the ma...

Embodiment 1

[0084] This embodiment provides a drainage sand whose raw materials include: chrome sand 55wt%, zircon sand 15wt%, quartz sand 25wt%, carbon black 0.5wt%, medium carbon graphite 0.7wt%, and sintering agent 3.8wt%.

[0085] Among them, the refractoriness of zircon sand is ≥1850°C, ZrO 2 The content of zircon sand is 62wt%, and the particle size is 0.2-1mm zircon sand accounts for 82wt%;

[0086] Cr in chrome sand 2 o 3 The content is 46wt%, and the chrome sand whose particle size is 0.25-0.9mm accounts for 85wt%;

[0087] SiO in quartz sand 2 The content is 96wt%, and the quartz sand with a particle size of 0.4-0.85mm accounts for 85wt%;

[0088] The carbonaceous lubricant is carbon black with a particle size of 8-100nm and medium carbon graphite with a particle size of 1μm-15μm, and the sintering agent is potassium feldspar with a particle size of 0.2-0.5mm.

[0089] The preparation method of above-mentioned drainage sand comprises:

[0090] Sieve all qualified raw mater...

Embodiment 2

[0093] This embodiment provides a drainage sand whose raw materials include: chrome sand 45wt%, zircon sand 20wt%, quartz sand 30wt%, carbon black 0.4wt%, medium carbon graphite 0.6wt%, and sintering agent 4.0wt%.

[0094] Among them, the refractoriness of zircon sand is ≥1850°C, ZrO 2 The content of zircon sand is 65wt%, and the particle size is 0.2-1mm zircon sand accounts for 89wt%;

[0095] Cr in chrome sand 2 o 3 The content is 47wt%, and the chrome sand whose particle size is 0.25-0.9mm accounts for 90wt%;

[0096] SiO in quartz sand 2 The content is 99wt%, and the quartz sand with a particle size of 0.4-0.85mm accounts for 91wt%;

[0097] The carbonaceous lubricant is carbon black with a particle size of 8-100nm and medium carbon graphite with a particle size of 1μm-15μm, and the sintering agent is potassium feldspar with a particle size of 0.2-0.5mm.

[0098] The preparation method of above-mentioned drainage sand comprises:

[0099] Sieve all qualified raw materia...

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Abstract

The invention discloses a drainage sand, a preparation method and application thereof, and belongs to the technical field of steelmaking auxiliary materials. The raw materials include 5-20 parts of zircon sand, 45-75 parts of chrome sand, 10-30 parts of quartz sand, 0.4-1 part of carbonaceous lubricant and ≤4 parts of sintering agent. ZrO in zircon sand 2 The content ≥ 62wt%, at least 80wt% of the particle size is 0.2-1mm. Cr in chrome sand 2 o 3 The content ≥ 46wt%, at least 85wt% of the particle size is 0.25-0.9mm. SiO in quartz sand 2 The content ≥ 96wt%, at least 85wt% of the particle size is 0.4-0.85mm. The drainage sand has uniform and stable composition, dense filling, good fluidity, uniform and moderate sintered layer, good pouring effect, and automatic pouring rate ≥ 99.5%. The preparation method comprises roasting the raw material mixed with water, the method is simple, easy to operate and suitable for industrial production. It is suitable for the preparation of high-quality steel grades.

Description

technical field [0001] The invention relates to the technical field of steelmaking auxiliary materials, in particular to a drainage sand and its preparation method and application. Background technique [0002] At present, due to the development of the steel industry in both domestic and international markets, there are more and more manufacturers of smelting steel types. Due to the particularity of steel types, the tapping temperature and molten steel composition after converter smelting are different from conventional steel types. difference, so that the molten steel enters the ladle and contacts the drainage sand added to the ladle nozzle, or reacts, or the sintering layer of the drainage sand is thickened due to the tapping temperature or the later refining treatment of the molten steel, so that when the ladle is poured due to the hydrostatic pressure It is not enough to crush the sintered layer, resulting in the failure of self-opening of drainage, unplanned shutdown or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/44C04B35/66
CPCB22D41/44C04B35/66C04B2235/3241C04B2235/3244C04B2235/3418C04B2235/3427C04B2235/3472C04B2235/424C04B2235/425C04B2235/9676
Inventor 陈永彦李晓阳秦教武张洪满王岩王希彬任义
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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