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Method for extracting vanadium from vanadium slag clinker leached by ammonium carbonate

An ammonium carbonate and leaching technology, which is applied in the field of vanadium hydrometallurgy, can solve the problems of increasing process flow and production cost, vanadium loss, etc., and achieve the effects of suitable pH and composition, low cost and simple operation process

Active Publication Date: 2014-04-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acidic ammonium salt vanadium precipitation is based on the action of polyvanadate and ammonium salt in acidic vanadium solution to generate ammonium hexapolyvanadate precipitation, while V in acidic vanadium solution 2 o 5 When the / P molar ratio is less than 178, the precipitation of vanadium tends to produce soluble dodecanovanate instead of ammonium hexavanadate, resulting in the loss of vanadium
Therefore, after acid leaching, it is necessary to purify the solution before vanadium precipitation. Whether it is purification by precipitation, extraction, or ion exchange purification, it will increase the process and production costs.
In addition, the calcification roasting and sodium carbonate leaching process have been explored and studied, and the leaching rate of vanadium can reach more than 90%, but there are still impurity elements such as Si and P in the leaching solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] The high calcium vanadium slag (containing V 2 o 5 8.55wt.%, CaO 5.57wt.%, P 2 o 5 0.67 wt.%,) ground and sieved, and the 200-mesh sieve was put into a muffle furnace for calcification and oxidation roasting at 800°C for 2 hours. Keep the furnace door of the muffle furnace half-open during the roasting process to ensure that the entire roasting process is in an oxidizing atmosphere. Stir occasionally during roasting to reduce lumps. After roasting, take it out and cool to room temperature in air. Grinding and sieving the roasted vanadium slag clinker, and taking the 300-mesh sieve, the particle size of the vanadium slag clinker is less than 0.0500mm.

[0016] Put 25ml of 600g / L ammonium carbonate solution into the three-necked flask, put a rubber stopper on the mouth of the bottle without plugging it tightly, and put it into a 98°C constant temperature heating magnetic stirring water bath. Add 5g of vanadium slag clinker to the flask and start timing, leaching ...

example 2

[0019] The high calcium vanadium slag (containing V 2 o 5 8.55 wt.%, CaO 5.57 wt.%, P 2 o 5 0.67 wt.%) was ground and sieved, and the 200-mesh sieve was put into a muffle furnace for calcification and oxidation roasting at 850°C for 2 hours. Keep the furnace door of the muffle furnace half-open during the roasting process to ensure that the entire roasting process is in an oxidizing atmosphere. Stir occasionally during roasting to reduce lumps. After roasting, take it out and cool to room temperature in air. Grinding and sieving the roasted vanadium slag clinker, and taking the 300-mesh sieve, the particle size of the vanadium slag clinker is less than 0.0500mm.

[0020] Put 50ml of 600g / L ammonium carbonate solution into the three-necked flask, put a rubber stopper on the mouth of the bottle without plugging it tightly, and put it into a 98°C constant temperature heating magnetic stirring water bath. Then add 5g vanadium slag clinker in the flask and start timing, le...

example 3

[0023] Vanadium slag (including V 2 o 5 15.79 wt.%, CaO 2.4 wt.%), grind and sieve, take 10g of 200-mesh sieve and 0.702g of calcium oxide (analytical pure) and mix it into a muffle furnace, and calcify and oxidize it at 850°C for 2 Hour. Keep the furnace door of the muffle furnace half-open during the roasting process to ensure that the entire roasting process is in an oxidizing atmosphere. Stir occasionally during roasting to reduce lumps. After roasting, take it out and cool to room temperature in air. The roasted vanadium slag clinker is ground and sieved, and the 200-mesh sieve is taken, and the particle size of the vanadium slag clinker is less than 0.0745mm.

[0024] Put 200ml of 400g / L ammonium carbonate solution into the three-necked flask, put a rubber stopper on the mouth of the bottle without plugging it tightly, and put it into a 90°C constant temperature heating magnetic stirring water bath. Then load 20g of vanadium slag clinker into the flask and start t...

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Abstract

The invention discloses a method for extracting vanadium from vanadium slag clinker leached by ammonium carbonate. The method comprises the following steps of: calcifying and roasting vanadium slag of which the molar ratio of CaO to V2O5 is (2-3):1 at the temperature of between 700 and 900 DEG C, grinding the vanadium slag clinker, sieving, and leaching by an ammonium carbonate solution at the leaching temperature of between 60 and 98 DEG C for 30 to 120 minutes, filtering to obtain vanadium-containing leachate, performing vanadium deposition on the vanadium-containing leachate to obtain a vanadium finished product, wherein when the ammonium carbonate solution is leached, the concentration of the ammonium carbonate solution is between 200 and 800 g / L, and a liquid / solid ratio of the ammonium carbonate solution to the vanadium slag clinker is (5-30):1. According to the method, a leaching process is easy to operate and low in cost, and has low requirement on the equipment; and a leaching agent is low in cost and can be recycled, so that the production cost is reduced. By the method, the leaching rate of the vanadium is high, namely is over 90 percent, impurity elements and particularly a phosphorus element in the leachate are reduced, and the leaching rate of phosphorus is less than 10 percent.

Description

technical field [0001] The invention relates to a method for extracting vanadium by leaching vanadium slag clinker with ammonium carbonate, and belongs to the technical field of vanadium hydrometallurgy. Background technique [0002] Vanadium slag refers to a kind of slag rich in vanadium oxides and iron oxides after the molten iron containing vanadium is oxidized by converter blowing and other methods. It is one of the main raw materials for vanadium extraction. In the traditional sodium roasting and water leaching vanadium extraction process, sodium salt (soda, salt) is added during the roasting process, and corrosive gases (HCl, Cl 2 , SO 2 , SO 3 etc.) cause serious pollution to the environment. And this process is not suitable for vanadium slag with high calcium content. Calcium is easy to form water-insoluble calcium vanadate or calcium-containing vanadium bronze with vanadium pentoxide during the roasting process. This part of vanadium remains in the slag during wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/14C22B34/22
CPCY02P10/20
Inventor 李鸿乂王宁谢兵王雨李翠方海星
Owner CHONGQING UNIV
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