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High vanadium ferroalloy smelting method

A smelting method and high vanadium ferrovanadium technology are applied in the smelting field of high vanadium ferrovanadium, which can solve the problems of high residual vanadium in slag, segregation of ferrovanadium, and inability to run smoothly in production, so as to overcome difficulty in breaking, change the structure of ferrovanadium, and improve recovery. rate effect

Active Publication Date: 2015-07-22
攀钢集团西昌钒制品科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Straight tube furnace smelting high-vanadium ferro-vanadium adopts a one-step process of smelting ferro-vanadium, that is, each smelting furnace needs to replace the combined straight tube furnace body once, the furnace body is prepared offline, and the vanadium-iron alloy liquid and slag obtained from smelting are processed offline. The furnace cools down and separates naturally, and the output of a single furnace is about 3 tons. If the furnace capacity is further expanded, the segregation of ferrovanadium will be serious, and the product quality cannot be effectively controlled; at the same time, the residual vanadium in the slag is high, and the recovery rate of ferrovanadium smelting is low
If a tilting electric arc furnace is used for smelting, since the melting point of high-vanadium ferro-vanadium is about 150°C higher than that of medium-vanadium ferro-vanadium, it will be difficult to crush high-vanadium ferro-vanadium with fine-grained structure after casting, and the production cannot be smooth. Row

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Examples

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example 1

[0029] First carry out batching, each compound used and its proportioning ratio are as shown in Table 1.

[0030] Use 500 kg of vanadium-containing rich slag and 200 kg of lime as the bottom, quickly add the first-stage mixture into the electric arc furnace, turn on the electricity, and then return 1500 kg of hot vanadium-containing rich slag from the previous furnace to the furnace. 190V high-voltage full-load power transmission is used to speed up the chemical material speed. After 20-30 minutes of smelting, through visual inspection and sampling analysis, when the V content in the smelting slag is 0.48%, the first phase of poor slag is produced, and a low voltage of 135V and a low current of 6000A are used for slag production.

[0031] After the first stage of poor slag is discharged, enter the second stage of reduction, switch to a high voltage of 150V and a high current of 15000-18000A, add the second-stage mixture and the feeding speed of 78~ depends on the furnace condi...

example 2

[0038] First carry out batching, each compound used and its proportioning ratio are as shown in Table 2.

[0039] Use 500 kg of vanadium-containing rich slag and 200 kg of lime as the bottom, quickly add the first-stage mixture into the electric arc furnace, turn on the electricity, and then return 2000 kg of hot vanadium-containing rich slag from the previous furnace to the furnace. 190V high-voltage full-load power transmission is used to speed up the chemical material speed. After 20 to 30 minutes of smelting, through visual inspection and sampling analysis, when the V content in the smelting slag is 0.45%, the first phase of poor slag is produced, and a low voltage of 135V and a low current of 6000A are used for slag production.

[0040] After the first phase of poor slag is discharged, enter the second phase of reduction, switch to a high voltage of 150V and a high current of 15000-18000A, add the mixture of the second phase, and the feeding speed depends on the furnace c...

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Abstract

The invention discloses a high vanadium ferroalloy smelting method. The method comprises the steps of adding cold-state vanadium-rich slag and limestone to the bottom of an electric arc furnace, adding a phase-I mixture consisting of vanadium pentoxide, aluminum particles, limestone and steel cuttings and smelting; returning heat-state vanadium-enriched slag of last batch into the electric arc furnace and discharging slag when vanadium content in smelting slag is less than 0.5%; adding a phase-II mixture consisting of vanadium trioxide, aluminum particles, limestone and steel cuttings, smelting, discharging slag when vanadium content in smelting slag is less than 0.5%, and before discharging the slag, adding aluminum or aluminum-magnesium alloy for reduction treatment; adding a refining mixture consisting of vanadium pentoxide and limestone or iron scale and limestone, smelting, controlling temperature of vanadium-iron alloy liquid in the furnace to be above 1900 DEG C, discharging the vanadium-iron alloy liquid and the vanadium-enriched slag when vanadium content is 78-82% and aluminum content is less than 1.5% in the vanadium-iron alloy liquid, pouring the vanadium-iron alloy liquid into an ingot mould which is preheated to be above 500 DEG C, and cooling, demoulding and breaking to obtain high vanadium ferroalloy which contains more than 80% of vanadium.

Description

technical field [0001] The invention belongs to the technical field of ferrovanadium smelting, and more specifically relates to a method for smelting high ferrovanadium. Background technique [0002] At present, high-vanadium ferro-vanadium is generally smelted in straight cylinder furnaces at home and abroad, and high-vanadium ferro-vanadium refers to ferro-vanadium alloys with a vanadium content of more than 80 wt%. Straight tube furnace smelting high-vanadium ferro-vanadium adopts a one-step process of smelting ferro-vanadium, that is, each smelting furnace needs to replace the combined straight tube furnace body once, the furnace body is prepared offline, and the vanadium-iron alloy liquid and slag obtained from smelting are processed offline. The furnace cools down and separates naturally, and the output of a single furnace is about 3 tons. If the furnace capacity is further expanded, the segregation of ferrovanadium will be serious, and the product quality cannot be ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B15/02C21B3/02B22D7/06
CPCY02W30/54Y02P10/20
Inventor 赖梅祥刘武汉哈春涛钟国梅
Owner 攀钢集团西昌钒制品科技有限公司
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