Resource recycling method for 80 ferrovanadium slag

A technology of ferrovanadium slag and recycling, applied in the field of metallurgy, can solve the problems of low utilization rate of elements, poor economic benefits, and impossibility of realization, and achieve the effects of quick results, small investment, and simplified production process steps

Active Publication Date: 2012-08-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, none of the existing processes can realize the comprehensive application of valuable metal elements such as vanadium, aluminum, magnesium, etc. in high-vanadium iron slag; the utilization rate of elements is low, the energy consumption is generally high, and the economic benefits are poor

Method used

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  • Resource recycling method for 80 ferrovanadium slag
  • Resource recycling method for 80 ferrovanadium slag
  • Resource recycling method for 80 ferrovanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The resource utilization method of the 80 vanadium iron slag adopts the following process steps.

[0028] 1. Raw material pretreatment:

[0029] 1) Crushing: Crushing the poor iron-vanadium slag through a jaw crusher to a particle size of less than 5mm.

[0030] 2) Grinding and screening: Grind the poor ferrovanadium slag after crushing with a ball mill for 20 minutes, and control the particle size of mechanical screening at -80 mesh.

[0031] 2. Mixing and stirring: Mix the poor iron vanadium slag and 80wt% sulfuric acid at a mass ratio of 1:5, and mechanically stir at a speed of 200r / min for 0.6h.

[0032] 3. Sulfation roasting:

[0033] 1) Pre-roasting stage: Pre-roast at 100°C for 24 hours for drying treatment, stirring several times in the middle.

[0034] 2) Roasting stage: Roast at 400°C for 2 hours to make roasted slag, and recover the exhaust gas; the flue gas produced by sulfation roasting is absorbed by sulfuric acid, and the obtained concent...

Embodiment 2

[0043] Embodiment 2: The resource utilization method of the 80 vanadium iron slag adopts the following process steps.

[0044] 1. Raw material pretreatment:

[0045] 1) Crushing: Crushing the poor iron-vanadium slag through a jaw crusher to a particle size of less than 5mm.

[0046] 2) Grinding and screening: Grind the poor ferrovanadium slag after crushing with a ball mill for 2 hours, and control the particle size of mechanical screening at -80 mesh.

[0047] 2. Mixing and stirring: Mix the poor iron vanadium slag and 98wt% sulfuric acid at a mass ratio of 1:3.5, and mechanically stir at a speed of 100r / min for 0.8h.

[0048] 3. Sulfation roasting:

[0049] 1) Pre-roasting stage: Pre-roast at 150°C for 4 hours for drying treatment, stirring several times in the middle.

[0050] 2) Roasting stage: Roast at 500°C for 5 hours to make roasted slag, and recover the exhaust gas; the flue gas produced by sulfation roasting is absorbed by sulfuric acid, and the obtained concentra...

Embodiment 3

[0059] Embodiment 3: The resource utilization method of the 80 vanadium iron slag adopts the following process steps.

[0060] 1. Raw material pretreatment:

[0061] 1) Crushing: Crushing the poor iron-vanadium slag through a jaw crusher to a particle size of less than 5mm.

[0062] 2) Grinding and screening: Grind the poor ferrovanadium slag after crushing with a ball mill for 40 minutes, and control the particle size of mechanical screening at -80 mesh.

[0063] 2. Mixing and stirring: Mix the poor iron vanadium slag and 45wt% sulfuric acid at a mass ratio of 1:10, and mechanically stir at a speed of 150r / min for 0.5h.

[0064] 3. Sulfation roasting:

[0065] 1) Pre-roasting stage: Pre-roast at 200°C for 1 hour for drying treatment, stirring several times in the middle.

[0066] 2) Roasting stage: Roast at 250°C for 6 hours to make roasted slag, and recover the exhaust gas; the flue gas produced by sulfation roasting is absorbed by sulfuric acid, and the obtained concentr...

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Abstract

The invention discloses a resource recycling method for 80 ferrovanadium slag, which adopts the following steps: (1) sulfating roasting: mixing the ferrovanadium slag and sulfuric acid, stirring, and then conducting sulfating roasting to obtain roasting slag; (2) leaching: mixing the roasting slag and deionized water or diluted acid, stirring and leaching, and then filtering to obtain leaching liquid; (3) enriching vanadium: adding ammonium sulfate into the leaching liquid, heating and dissolving, and then cooling, crystallizing, and filtering to obtain aluminum ammonium sulfate crystal and crystallization post liquid; (4) oxidizing and sinking vanadium: adding oxidant into the crystallizing post liquid to conduct oxidizing, converting all V3+ and V4+ in the crystallizing post liquid into V5+, then dropwise adding ammonia water, stirring and filtering to obtain ammonium polyvanadate sediment and filtrate, and roasting ammonium polyvanadate to obtain vanadium pentoxide; and (5) magnesium separating reacting: distilling and concentrating the filtrate, cooling, and filtering to obtain magnesium sulfate crystal. The method has the advantages of being simple in technology process, low in energy consumption and friendly in environment.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a resource utilization method of 80% vanadium iron slag. Background technique [0002] High-vanadium ferro-smelting usually uses vanadium oxides as raw materials, and adopts aluminothermic or electric aluminothermic smelting. This method will produce more than one ton of slag per ton of ferrovanadium. Only Chenggang produces more than 3000t of poor ferrovanadium slag every year, which contains V 2 o X 3~6%,Al 2 o 3 70-80%, loss of vanadium oxide (converted into V 2 o 5 ) total amount ≥ 100t / year. [0003] At present, there are mainly three ways to treat the 80-vanadium iron slag: the first one is to prepare refractory materials by compounding with high-aluminum magnesium aggregate as a gel material. Patent Publication No. CN 102145996A discloses a method for preparing refractory fire clay containing vanadium-iron slag. In the method, 50% to 80% of fine aggregate and 20% to 50% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C01F5/40C01F7/76B09B3/00
Inventor 祁健陈东辉石立新高明磊周冰晶
Owner HEBEI IRON AND STEEL
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