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Method for extracting vanadium from high-calcium and high-phosphorus vanadium slag

A high-calcium and high-phosphorus vanadium slag, phosphorus-vanadium technology, applied in the direction of improving process efficiency, can solve problems such as reducing vanadium leaching rate, inability to adapt to vanadium slag, hindering vanadium diffusion, etc.

Inactive Publication Date: 2013-11-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the generated vanadium slag has a high content of calcium oxide and phosphorus, and the traditional sodium roasting process and calcification roasting process can no longer adapt to the vanadium slag.
[0003] For high-calcium and high-phosphorus vanadium slag, in the sodium vanadium extraction process, calcium and vanadium are combined to produce calcium vanadate, which is difficult to leach during leaching; and if calcification roasting is used directly to process this type of vanadium slag , not only is it easy to form hardened rings during roasting, making the rotary kiln unable to operate normally, but also a large amount of calcium sulfate will be formed during acid leaching, covering the surface of the clinker particles, hindering the diffusion of vanadium in the clinker after roasting, thus Reduce vanadium leaching rate

Method used

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  • Method for extracting vanadium from high-calcium and high-phosphorus vanadium slag
  • Method for extracting vanadium from high-calcium and high-phosphorus vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] The composition of the high-calcium and high-phosphorus vanadium slag in this example is shown in sample 1 in Table 1.

[0037] The high-calcium and high-phosphorus vanadium slag is crushed and ground to make its particle size about 95% below 120 mesh. Take 300g of high-calcium and high-phosphorus vanadium slag after grinding, mix it with 150ml of concentrated hydrochloric acid for activation reaction, the reaction time is 3 hours, and the reaction temperature is 90°C. After filtering, 140ml of supernatant and 132.8g of low-calcium and low-phosphorus vanadium are obtained scum.

[0038] Adjust the pH value of the supernatant to 5 with calcium oxide, settle and filter to obtain 98g of ferric hydroxide, evaporate and concentrate the remaining solution to 50ml, and crystallize after cooling to normal temperature to obtain 120g of anhydrous calcium chloride.

[0039] The low-calcium and low-phosphorus vanadium slag is directly roasted at a high temperature at a temperature...

example 2

[0042]The composition of the high-calcium and high-phosphorus vanadium slag in this example is shown in sample 2 in Table 1.

[0043] The high-calcium and high-phosphorus vanadium slag is crushed and ground to make its particle size about 95% below 120 mesh. Take 300g of high-calcium and high-phosphorus vanadium slag after grinding, mix it with 150ml of concentrated hydrochloric acid for activation reaction, the reaction time is 4 hours, and the reaction temperature is 95°C. After filtering, 142ml of supernatant and 135.8g of low-calcium and low-phosphorus vanadium are obtained scum.

[0044] Adjust the pH value of the supernatant to 5 with calcium oxide, settle and filter to obtain 90g of ferric hydroxide, evaporate and concentrate the remaining solution to 50ml, and crystallize after cooling to normal temperature to obtain 110g of anhydrous calcium chloride.

[0045] The low-calcium and low-phosphorus vanadium slag is directly roasted at a high temperature at a temperature ...

example 3

[0048] The composition of the high-calcium and high-phosphorus vanadium slag in this example is shown in sample 3 in Table 1.

[0049] The high-calcium and high-phosphorus vanadium slag is crushed and ground to make its particle size about 95% below 120 mesh. Take 300g of finely ground high-calcium and high-phosphorus vanadium slag, mix it with 150ml of concentrated hydrochloric acid for activation reaction, the reaction time is 3 hours, and the reaction temperature is 95°C. After filtering, 145ml of supernatant and 140.8g of low-calcium and low-phosphorus vanadium are obtained scum.

[0050] Calcium oxide was used to adjust the pH value of the supernatant to 6, sedimentation and filtration to obtain 110.8 g of ferric hydroxide, the remaining solution was evaporated and concentrated to 50 ml, cooled to normal temperature and crystallized to obtain 100.5 g of anhydrous calcium chloride.

[0051] The low-calcium and low-phosphorus vanadium slag is directly roasted at a high tem...

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Abstract

The invention provides a method for extracting vanadium from high-calcium and high-phosphorus vanadium slag. The method comprises the following steps of: crushing the high-calcium and high-phosphorus vanadium slag, and adding concentrated hydrochloric acid into the crushed high-calcium and high-phosphorus vanadium slag to carry out activating treatment, wherein the CaO / V2O5 content in the high-calcium and high-phosphorus vanadium slag is higher than 1, and the phosphorus content in the high-calcium and high-phosphorus vanadium slag is higher than 0.15wt%; filtering and separating to obtain a supernatant and low-calcium and low-phosphorus vanadium slag; regulating the pH value of the supernatant to 2.5-10, filtering to obtain ferric hydroxide, evaporating and concentrating the filtered solution, and then, cooling and crystallizing to obtain calcium chloride; roasting the low-calcium and low-phosphorus vanadium slag within the temperature range of 800-1500 DEG C to obtain clinker, and then, carrying out acid leaching to obtain a vanadium liquid; regulating the pH value of the vanadium liquid to 1-5, and then, adding soluble ammonium salt to enable vanadium to be settled to obtain ammonium vanadate; and calcining and decomposing the ammonium vanadate to obtain vanadium pentoxide. The method has the advantages that the vanadium element in the high-calcium and high-phosphorus vanadium slag can be effectively utilized, and two byproducts including the ferric hydroxide and the calcium chloride can be obtained.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction chemical industry, and specifically relates to a method for extracting vanadium from high-calcium and high-phosphorus vanadium slag. Background technique [0002] Usually, when recovering vanadium in low-vanadium molten iron, more calcium oxide needs to be added, which not only can recover vanadium in molten iron, but also facilitates desulfurization and dephosphorization of molten iron. However, the generated vanadium slag has a high content of calcium oxide and phosphorus, and the traditional sodium roasting process and calcification roasting process can no longer adapt to the vanadium slag. [0003] For high-calcium and high-phosphorus vanadium slag, in the sodium vanadium extraction process, calcium and vanadium are combined to produce calcium vanadate, which is difficult to leach during leaching; and if calcification roasting is used directly to process this type of vanadium slag ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B7/04
CPCY02P10/20
Inventor 殷兆迁孙朝晖
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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