Method for preparing ferroboron based on thermit self-propagating gradient reduction and slag-washing refining
A self-propagating technology of ferroboron alloy, applied in the field of ferroalloy, can solve the problems of high carbon content, low recovery rate of alloy elements, large segregation of alloy components, etc. in ferroboron alloy, and achieve the effect of lowering melt temperature, energy consumption and viscosity
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Embodiment 1
[0054] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:
[0055] Step 1: Material pretreatment
[0056] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;
[0057] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe 2 o 3 Powder: aluminum powder: CaO=1.0:2.73:1.7:1.12;
[0058] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;
...
Embodiment 2
[0074] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:
[0075] Step 1: Material pretreatment
[0076] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;
[0077] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe 2 o 3 Powder: aluminum powder: CaO=1.0:2.71:1.9:1.43;
[0078] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;
...
Embodiment 3
[0094] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:
[0095] Step 1: Material pretreatment
[0096] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;
[0097] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe2 o 3 Powder: aluminum powder: CaO=1.0:2.82:2.0:1.68;
[0098] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;
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