Preparation method of calcium ferrite

A technology of calcium ferrite and iron ore powder, applied in the field of metallurgy, can solve the problems of waste of resources, environmental pollution, etc., and achieve the effects of speeding up slagging and dephosphorization, high product value and simple operation.

Inactive Publication Date: 2019-10-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, no suitable method has been found at home and abroad to deal with the desulfurization ash, so the desulfurization ash in iron and steel plants is mainly disposed of in the way of stockpiling. Because the desulfurization ash contains a large amount of calcium, it not only causes a great waste of resources, but also affects the surrounding environment. The environment is polluted, so it is urgent to treat part of the desulfurization ash

Method used

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  • Preparation method of calcium ferrite
  • Preparation method of calcium ferrite

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Embodiment 1

[0025] The preparation of embodiment 1 calcium ferrite

[0026] (1) Oxidation Roasting Fresh desulfurized ash was taken and roasted in an air atmosphere at a roasting temperature of 600°C for a roasting time of 20 minutes. After the roasting was complete, the product was cooled.

[0027] (2) Mixing

[0028] Add bituminous coal and hematite to the product obtained in the previous step and mix, S element in desulfurization ash: Fe element in iron ore powder: C element in carbon powder = 1:0.5-2:0-2, stir and mix for 30 minutes, made into mixed powder;

[0029] (3) Briquetting

[0030] The powder after mixing is used briquetting machine, and briquetting pressure is 20MPa, and sample diameter is 3cm, and height is 2cm, and weight is the block shape of 3g.

[0031] (4) Heating and roasting The mixed powder obtained in step (2) or the block sample obtained in step (3) is heated and roasted in an electric rotary kiln, and the specific steps are as follows:

[0032] S1 opens the p...

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Abstract

The invention relates to a preparation method of calcium ferrite. The conditions of large amount, difficult storage, difficult disposition, seriously pollution of desulfurized fly ash in a raw material factory are aimed at, firstly the desulfurized ash is heated for a period of time at oxidizing atmosphere, then coal powder, coke powder, iron ore powder are added as raw materials, crushing, mixing, water adding briquetting, hot pressing, heating roasting and other steps are conducted, a product with the calcium ferrite as the main component is prepared after desulfuration, and removed sulfur is prepared to sulfuric acid and recovered by an absorption tower. The preparation method of the calcium ferrite is advanced in process method, simple in operation and high in desulfurization rate, thepurity of a produced product is high, and the preparation method can be used as a sintering additive or a converter slag making agent to realize recycling of waste.

Description

technical field [0001] The application belongs to the technical field of metallurgy, and in particular relates to a preparation method of calcium ferrite. Background technique [0002] The iron and steel industry is an important basic industry in my country, which has the characteristics of high energy consumption, high emissions, and serious environmental pollution. With the continuous development of metallurgical technology in the iron and steel industry, the volume of blast furnaces has also expanded, resulting in a further increase in smoke and dust emissions. The sintering flue gas emitted by iron and steel enterprises contains a large amount of SO 2 , the SO of this link 2 Emissions as high as the entire iron and steel plant SO 2 60% of total emissions. Since the main raw material for ironmaking is sinter, the solution to SO by closing the sinter plant 2 The problem of emissions is not feasible, so the only option at present is to desulfurize the sintering flue ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C01B17/74
CPCC01B17/74C01G49/0081C01P2002/72
Inventor 毛瑞苏航茅沈栋王飞
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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