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Purifying and impurity-removing method of leaching solution containing vanadium

A technology for purifying impurity removal and leaching solution, applied in the field of wet vanadium extraction, can solve the problems of high suspended matter impurities, affecting vanadium extraction operation, and high impurity content, and achieves the effects of good purification effect, short solution settling time and simple process operation.

Active Publication Date: 2011-02-16
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium-containing clinker after sodium roasting is continuously leached with a belt filter, and the suspended matter in the vanadium-containing leach solution is relatively high. The plant uses calcium chloride to reduce the suspended matter and purify the phosphorus, silicon impurities, and chlorine. Calcium consumption is 50~60kg / t V 2 o 3 , P<0.015g / l in the purified vanadium-containing leaching solution, and Si is 0.5-1.8g / l. At the same time, a large amount of vanadium-containing underflow slag is produced. According to statistics, every ton of vanadium trioxide produced produces 100kg of underflow , the vanadium content of the underflow slag is 10% to 12%, and the loss of vanadium in the process is 1.4% to 1.7%. This part of the vanadium-containing underflow slag is treated with the existing technology, and the recovery rate is low. The impurity content in is also relatively high, which affects the subsequent vanadium extraction operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1000ml by NH 4 + Vanadium-containing leach solution leached from industrial condensate water with a concentration of 156mg / l, with a vanadium concentration of 28.05g / l, a pH value of 9.5, a P content of 0.065g / l, a Si content of 1.06g / l, and an amount of magnesium sulfate of 0.81g (Mg / P mass ratio 2.5), the amount of alum is 9.54g (alum / Si mass ratio 9), after heating to 85°C, add 8.59g alum under stirring condition, add 0.81g magnesium sulfate after 15min of reaction, add after 15min 0.95g alum, stop stirring after reacting for 15min, let it stand for 13min, the sediment naturally settles, and the underflow (that is, sediment) is sent to the plate and frame for pressure filtration, and the V content is 27.84g / l, and the P content is 0.009g / l , Si content is 0.03g / l vanadium-containing clear liquid, process vanadium loss is 0.75%, purification yield is 99.25%.

Embodiment 2

[0024] Take 1000ml by NH 4 + Vanadium-containing leach solution leached from industrial condensate water with a concentration of 186mg / l, a vanadium concentration of 26.82g / l, a pH value of 9, a P content of 0.059g / l, a Si content of 1.42g / l, and an amount of magnesium sulfate of 0.64g (Mg / P mass ratio 2.2), the amount of alum is 11.36g (alum / Si mass ratio 8), after heating to 80°C, add 10.22g alum under stirring condition, add 0.64g magnesium sulfate after 12min, add 1.14g after 10min g alum, stop stirring after reacting for 10 minutes, let it stand for 15 minutes, the sediment naturally settles, and the bottom flow is sent to plate and frame pressure filtration to obtain a V content of 26.68g / l, a P content of 0.008g / l, and a Si content of 0.04g / l The vanadium-containing clear liquid has a process vanadium loss of 0.52% and a purification yield of 99.48%.

Embodiment 3

[0026] Take 1000ml by NH 4 + Concentration is the vanadium-containing leachate of 179mg / l industrial condensate leaching, and vanadium concentration is 29.42g / l, and pH value is 10, and P content is 0.061g / l, and Si content is 0.98g / l, and magnesium sulfate consumption is 0.61g ( Mg / P mass ratio 2), the amount of alum is 9.80g (alum / Si mass ratio 10), after heating to 83°C, add 8.82g alum under stirring condition, add 0.61g magnesium sulfate after 10min, add 0.98g after 13min Alum, after reacting for 13 minutes, stop stirring, let it stand for 10 minutes, and the sediment will settle naturally, and the underflow will be sent to plate and frame pressure filtration to obtain a product with a V content of 29.22g / l, a P content of 0.011g / l, and a Si content of 0.03g / l. The vanadium-containing serum has a vanadium loss of 0.68% and a purification yield of 99.32%.

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Abstract

The invention provides a purifying and impurity-removing method of a leaching solution containing vanadium, which comprises the following steps: leaching a material containing vanadium to obtain the leaching solution containing vanadium; according to the phosphorus content and the silicon content in the leaching solution containing vanadium, respectively determining the addition of magnesium sulfate and the addition of alum; heating the leaching solution containing vanadium to a certain temperature; first adding part of the alum while stirring the leaching solution containing vanadium; after a first period of time, adding the magnesium sulfate to the mixture; after a second period of time, adding the residual alum to the mixture; after reaction for a period of time, standing and precipitating the mixture; and after precipitating the mixture after reaction for a period of time, delivering the clear solution to a subsequent process of precipitation, and delivering the bottom flow to a plate frame for pressing filtration. The method can effectively control the content of silicon and phosphorus in the solution containing vanadium to below relatively low values, reduces the loss of vanadium and greatly increases the purifying yield.

Description

technical field [0001] The invention relates to the field of vanadium extraction by wet method, in particular, the invention relates to a method for purifying and removing impurities in a vanadium-containing leaching solution. Background technique [0002] The sodium roasting-leaching-precipitation process is commonly used at home and abroad to produce vanadium oxide. In this process, because the precipitation process has high requirements for the impurity content in the vanadium-containing leaching solution, especially for the silicon and phosphorus impurities in it, Therefore, it is necessary to purify and remove impurities from the vanadium-containing leaching solution. [0003] Most manufacturers of wet vanadium extraction use calcium chloride to purify the vanadium-containing leaching solution. The advantage of this method is that the phosphorus removal effect is better and the cost of phosphorus removal agent is low. However, this method has the disadvantages of high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B34/22
CPCY02P10/20
Inventor 邓孝伯李大标顾计勇王永钢王宗海邓杰博
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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