Method for pretreating, decalcifying and dephosphorizing high-calcium and high-phosphorus vanadium slag

A high-calcium and high-phosphorus vanadium slag and pretreatment technology, applied in the field of metallurgy, can solve the problems of unsuitable high-calcium and high-phosphorus vanadium slag for decalcification and dephosphorization, affecting the quality of ammonium metavanadate, low phosphorus leaching rate, etc., to achieve vanadium Small loss, easy industrial application, good removal effect

Pending Publication Date: 2019-08-09
PANZHIHUA UNIV +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the removal of phosphorus, according to the volume of the leaching solution and the content of P, the prepared 10%-20% CaCl 2 Add the solution into the leaching solution and use compressed air to stir for 15 minutes, then let it stand for 40 minutes after stirring, then take a sample to analyze the content of P in the leaching solution. When the mass ratio of TV / P is 1100, it meets the requirements of the vanadium precipitation solution for phosphorus content; 5.51% vanadium loss in phosphorus process
[0005] CN102560086A discloses a method for extracting vanadium from ammonium carbonate leaching vanadium slag clinker: it combines CaO / V 2 o 5 The vanadium slag with a molar ratio of 2 to 3 is calcined and roasted at 700°C to 900°C, the vanadium slag clinker is ground and screened and leached with 200 to 800g / L ammonium carbonate solution, and the ammonium carbonate solution and vanadium slag clinker are controlled The liquid-solid ratio is 5-30, the leaching temperature is 60°C-98°C, and the leaching time is 30min-120min, so that the leaching rate of vanadium can reach more than 90%, and the leaching rate of phosphorus is 10% lower; but this process is to leach vanadium into the leach solution , not suitable for decalcification and dephosphorization of high calcium and high phosphorus vanadium slag
This research can realize the recycling of waste water and waste residue, but because ammonium oxalate will crystallize and precipitate at lower temperature, ammonium oxalate will crystallize and precipitate when vanadium is deposited at lower temperature, which will affect the quality of ammonium metavanadate
[0007] In summary, the current research on high-calcium and high-phosphorus vanadium slag focuses on roasting, leaching, and vanadium precipitation, while there are few studies on the pretreatment of high-calcium and high-phosphorus vanadium slag to achieve decalcification and dephosphorization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Grind 300g of high-calcium and high-phosphorus vanadium slag (V: 5.7%, CaO: 30.28%, P: 1.56%) through a ball mill to 0.074mm; take 50g of the ground vanadium slag and add chlorinated In the ammonium solution, the liquid-solid ratio is 4:1, the leaching temperature is 95°C, the stirring speed is 400r / min, and the stirring and leaching is 120min; after the stirring is stopped, filter and dry the solid at 100°C for 8h to obtain the decalcified and desulfurized vanadium slag, the quality of the vanadium slag is 42.74g, V content: 6.4%, CaO content 15.09%, P content 1.30%, decalcification rate 40.46%, dephosphorization rate 28.76%, vanadium loss rate 4.1%.

Embodiment 2

[0039]Grind 300g of high-calcium and high-phosphorus vanadium slag (V: 5.7%, CaO: 30.28%, P: 1.56%) through a ball mill to 0.074mm; take 30g of vanadium slag after grinding, and add chlorinated In the ammonium solution, the liquid-solid ratio is 5:1, the leaching temperature is 95°C, the stirring speed is 400r / min, stirring and leaching for 120min; after the stirring is stopped, filter and dry at 100°C for 8h to obtain decalcified and desulfurized vanadium slag, the mass of which is 26.10g , the V content is 6.4%, the CaO content is 19.18%, the P content is 1.20%, the decalcification rate is 44.89%, the dephosphorization rate is 33.07%, and the vanadium loss rate is 2.4%.

Embodiment 3

[0041] Grind 300g of high-calcium and high-phosphorus vanadium slag (V: 5.7%, CaO: 30.28%, P: 1.56%) through a ball mill to 0.033mm; take 100g of the ground vanadium slag, and add chlorinated In the ammonium solution, the liquid-solid ratio is 5:1, the leaching temperature is 95°C, the stirring speed is 400r / min, stirring and leaching for 120min; after the stirring is stopped, filter and dry at 100°C for 8h to obtain decalcified and desulfurized vanadium slag with a mass of 84.76g , the V content was 6.6%, the CaO content was 15.31%, the P content was 1.68%, the decalcification rate was 40.46%, the dephosphorization rate was 28.76%, and the vanadium loss rate was 1.9%.

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Abstract

The invention discloses a method for pretreating, decalcifying and dephosphorizing high-calcium and high-phosphorus vanadium slag, and belongs to the technical field of metallurgy. The method for pretreating, decalcifying and dephosphorizing high-calcium and high-phosphorus vanadium slag aims to overcome the problems that high-calcium and high-phosphorus vanadium slag influences the productivity and cost during vanadium extraction. The method comprises the steps: mixing and leaching the high-calcium and high-phosphorus vanadium slag with an ammonium chloride solution, carrying out solid-liquidseparation after leaching, and drying the solid to obtain the decalcified and dephosphorized vanadium slag. The method adopts the ammonium chloride solution to leach and pretreat the high-calcium andhigh-phosphorus vanadium slag, so that insoluble calcium oxide in the high-calcium and high-phosphorus vanadium slag reacts with the ammonium chloride to form soluble calcium chloride, meanwhile, thephosphorus content in the slag is reduced, the decalcified low-phosphorus vanadium slag is obtained, and the subsequent processes of roasting, leaching and vanadium precipitation can be smoothly carried out.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a pretreatment method for decalcification and dephosphorization of high-calcium and high-phosphorus vanadium slag. Background technique [0002] Vanadium is widely used in metallurgy, chemical industry and aerospace, etc. It is a strategic resource, which is indispensable for the development and progress of contemporary industry, national defense and science and technology. Vanadium slag is an important raw material for vanadium extraction. The two main vanadium extraction processes currently used in industrial applications are sodium roasting-water leaching vanadium extraction and calcification roasting-acid leaching vanadium extraction. Sodium roasting-water leaching vanadium extraction process requires lower calcium and phosphorus content in vanadium slag, and calcification roasting-acid leaching vanadium extraction requires lower phosphorus content in vanadium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/04
CPCC22B3/10C22B34/22Y02P10/20
Inventor 王俊朱学军杨涛张毅陈华简红吉马莹
Owner PANZHIHUA UNIV
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