Method for treating underflow slag of wastewater with sedimentated vanadium and hydrometallurgical vanadium extraction process

A technology for vanadium precipitation wastewater and underflow slag is applied in the direction of improving process efficiency, which can solve problems such as unqualified product quality and difficulty in wastewater treatment, and achieve the effect of optimizing process steps and simplifying operation and treatment processes.

Inactive Publication Date: 2015-02-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
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Problems solved by technology

The method of using sodium hydroxide solution to dissolve the bottom flow slag of vanadium precipitation wastewater is due to the newly added Na + , which brings great difficulties to wastewater treatment
In addition, the products obtained after using sodium hydroxide solution to dissolve the bottom flow slag of vanadium precipitation wastewater or directly melting the bottom flow slag of vanadium precipitation wastewater are usually of substandard quality

Method used

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  • Method for treating underflow slag of wastewater with sedimentated vanadium and hydrometallurgical vanadium extraction process

Examples

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Effect test

example 1

[0031] Take 2L of alkaline vanadium solution (the concentration of all vanadium is 25.2g / L, the content of P is 0.05g / L, the pH value is 9.5, and the temperature is 70°C), and 160g of vanadium precipitation wastewater underflow slag is added (the content of ammonium polyvanadate accounts for 94% %, pH value is 4.2), add impurity remover CaCl after stirring for 30min 2 0.54g, the reaction was continuously stirred for 20min, and filtered to obtain a high-concentration vanadium solution with a pH value of 6.2 and a vanadium loss of 0.015%.

example 2

[0033] Take 4L of alkaline vanadium solution (the concentration of all vanadium is 35g / L, the content of P is 0.07g / L, the pH value is 11, and the temperature is 90°C), and 320g of vanadium precipitation wastewater underflow slag (the content of ammonium polyvanadate accounts for 92%) is added. , pH value is 5), add impurity remover CaCl after stirring 30min 2 1.52g was continuously stirred and reacted for 20min, and filtered to obtain a high-concentration vanadium solution with a pH value of 6.5 and a vanadium loss of 0.01%.

example 3

[0035] Take 3L of alkaline vanadium solution (the concentration of all vanadium is 25g / L, the content of P is 0.045g / L, the pH value is 9, and the temperature is 60°C), and 240g of vanadium precipitation wastewater underflow slag is added (the content of ammonium polyvanadate accounts for 96% , pH value is 3), add impurity remover CaCl after stirring 30min 2 0.73 g, and then continuously stirred and reacted for 20 min, and filtered to obtain a high-concentration vanadium solution with a pH value of 6.4 and a vanadium loss of 0.014%.

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Abstract

The invention discloses a method for treating underflow slag of wastewater with sedimentated vanadium and a hydrometallurgical vanadium extraction process. The method includes the steps: mixing the underflow slag of the wastewater with the sedimentated vanadium with alkaline vanadium liquid so as to form mixed liquor; edulcorating the mixed liquor; and filtering the edulcorated mixed liquor so as to obtain vanadium-containing filtrate. The method or the process has the advantages that the method using the alkaline vanadium liquid produced in the hydrometallurgical vanadium extraction process to dissolve the underflow slag of the wastewater with the sedimentated vanadium and recycle vanadium elements in the underflow slag of the wastewater with the sedimentated vanadium is provided; during underflow slag treatment, use of sodium hydroxide is completely avoided, and sulfuric acid of the pH (potential of hydrogen) value is regulated by reducing the acid sedimentated vanadium; and process steps are optimized, operation and treatment are simplified, and the underflow slag can be treated prior to edulcoration without being treated by additional special working procedures.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction by wet method, and more particularly, to a method capable of effectively treating vanadium precipitation wastewater underflow slag and recovering vanadium element and a wet vanadium extraction process. Background technique [0002] The wet vanadium extraction process is a common vanadium metallurgical process. Common wet vanadium extraction processes generally require roasting of vanadium raw materials in the early stage, such as sodium roasting and calcification roasting. In the prior art, the traditional process for producing vanadium oxide includes the steps of vanadium raw material pretreatment, sodium roasting, water immersion, purification, vanadium precipitation, deamination and the like. [0003] The upper layer liquid after vanadium precipitation is the main source of waste water in the vanadium extraction plant. The vanadium precipitation waste water also contains a large nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/12C22B34/22
CPCY02P10/20
Inventor 伍珍秀彭毅陈文龙汪超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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