A covering agent for thick material layer sintering

A technology of covering agent and thick material layer, applied in the field of foundry industry, can solve the problems such as the decrease of sintering utilization coefficient and sintering yield, insufficient sintering of sintering mixture and reduction of vertical sintering speed, etc., so as to achieve good heat storage and heating performance, The effect of reducing fuel dosage and increasing vertical sintering speed

Active Publication Date: 2022-04-01
河北永洋特钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of thick material layer sintering technology also faces some difficulties. The most prominent problem is that due to the phenomenon of "automatic heat storage" in the sintered material layer, the heat in the upper part of the sintered material layer is relatively insufficient, and the temperature of the material layer is low, resulting in The sintering mixture is not fully sintered, and some raw materials may appear. At the same time, the excess heat in the lower part of the material layer will cause "over-melting", which will reduce the vertical sintering speed, resulting in a decrease in the sintering utilization factor and sintering yield.

Method used

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  • A covering agent for thick material layer sintering
  • A covering agent for thick material layer sintering
  • A covering agent for thick material layer sintering

Examples

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preparation example Construction

[0040] 1) SrMoO 4 material preparation

[0041] In a sealable polytetrafluoroethylene reactor, the Sr(NO 3 ) 2 Sr(OH) prepared with NaOH 2 solution, so that Sr(OH) 2 The concentration of the solution is 13wt%, feed nitrogen for 22 minutes, and discharge carbon dioxide gas; insert the aluminum sheet electrode and nickel electrode pretreated by nitric acid and sodium hydroxide solution, connect the aluminum sheet and nickel sheet with a wire, seal and store at room temperature After reacting for 4 hours, a thin film was deposited on the aluminum sheet. After the reaction was completed, the obtained thin film sample was rinsed, soaked in warm water for 5 min, and dried at room temperature to obtain SrMoO 4 Material;

[0042] 2) β-FeSi 2 preparation of

[0043] Mix Fe powder and Si powder at a molar ratio of 1:2 and ball mill, the ball milling speed is 230rpm, the ball-to-material ratio is 10:1, and the ball milling time is 0.5h; the mixed powder after ball milling is mold...

Embodiment 1

[0050] A covering agent for thick material layer sintering, the preparation steps comprising:

[0051] (1) Preparation of composite materials for covering agent

[0052] S1: β-FeSi 2 / Preparation of SiC material

[0053] Spread 2.5 parts by weight of modified SiC powder on 6 parts by weight of β-FeSi 2 The surface of the powder is placed in a high-temperature furnace and sintered in a high-temperature furnace to obtain β-FeSi 2 / SiC material; the sintering curve is: the vacuum degree of the high-temperature furnace is 9KPa, the heating rate is raised to 1600 °C at a rate of 12 °C / min, the temperature is kept for 2.5 hours, and the temperature is lowered to room temperature at a cooling rate of 5 °C / min;

[0054] S2: (β-FeSi 2 +SiC) / SrMoO 4 Preparation of composite materials

[0055] The above β-FeSi 2 / SiC material and SrMoO 4 According to the volume ratio of 2:15, the mass ratio of ball to material is 10:1, put it into the ball mill tank, the speed is 70rpm, and ball...

Embodiment 2

[0059] A covering agent for thick material layer sintering, the preparation steps comprising:

[0060] (1) Preparation of composite materials for covering agent

[0061] S1: β-FeSi 2 / Preparation of SiC material

[0062] Spread 3 parts by weight of modified SiC powder on 7 parts by weight of β-FeSi 2 The surface of the powder is placed in a high-temperature furnace and sintered in a high-temperature furnace to obtain β-FeSi 2 / SiC material; the sintering curve is: the vacuum degree of the high-temperature furnace is 7KPa, the heating rate is raised to 1650°C at a rate of 15°C / min, the temperature is kept at 1.5h, and the temperature is lowered to room temperature at a cooling rate of 3°C / min;

[0063] S2: (β-FeSi 2 +SiC) / SrMoO 4 Preparation of composite materials

[0064] The above β-FeSi 2 / SiC material and SrMoO 4According to the volume ratio of 3:10, the mass ratio of ball to material is 10:1, put it into the ball mill tank, the speed is 70rpm, and the ball mill is...

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Abstract

The invention discloses a covering agent for thick material layer sintering, which comprises (β-FeSi 2 +SiC) / SrMoO 4 Composite materials with expanded graphite; the above (β‑FeSi 2 +SiC) / SrMoO 4 The preparation method of the composite material is: the β‑FeSi 2 / SiC powder and SrMoO 4 Dispersed to get (β‑FeSi 2 +SiC)‑SrMoO 4 Composite powder; the SrMoO 4 melting, (β‑FeSi 2 +SiC)‑SrMoO 4 The composite powder is preheated, then the two are stirred and mixed, heat-treated to obtain a composite slurry, and the above composite slurry is poured into a preheated mold to obtain (β-FeSi 2 +SiC) / SrMoO 4 composite material. The covering agent has good heat storage and heat generation properties, can improve the quality, strength and output of sintered materials, and can reduce fuel consumption, thereby reducing sintering production costs and reducing environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of foundry industry, and in particular relates to a covering agent for sintering thick material layers. Background technique [0002] It is generally believed that thick material layer sintering can strengthen "automatic heat storage", reduce the proportion of fuel, increase the oxygen level inside the material layer, promote the combustion and burnout of solid fuel, and reduce the generation of FeO. Reduce fuel consumption, thereby reducing sintering production costs. However, the application of thick material layer sintering technology also faces some difficulties. The most prominent problem is that due to the phenomenon of "automatic heat storage" in the sintered material layer, the heat in the upper part of the sintered material layer is relatively insufficient, and the temperature of the material layer is low, resulting in The sintering mixture is not fully sintered, and some raw materials may appear. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 田利国牛延光温永亮宋乾苏泽康
Owner 河北永洋特钢集团有限公司
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