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

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 specifically, relates to a method capable of effectively treating bottom flow slag of vanadium precipitation wastewater and recovering vanadium element and a vanadium extraction process by wet method. Background technique

[0002] The wet vanadium extraction process is a common vanadium metallurgical process. Common wet vanadium extraction processes generally require roasting 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 pretreatment of vanadium raw materials, sodium roasting, water immersion, purification, vanadium precipitation, deammonization and other processes in sequence.

[0003] The supernatant liquid after vanadium precipitation is the main source of wastewater in the vanadium extraction plant. The vanadium precipitation wast...

Examples

example 1

[0031] Take 2L of alkaline vanadium liquid (the concentration of total 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), add 160g of the underflow slag of the vanadium precipitation wastewater (the content of ammonium polyvanadate accounts for 94 %, the pH value is 4.2), after stirring for 30min, add impurity remover CaCl 2 0.54g, and continue to stir and react for 20 minutes, and filter 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 liquid (total vanadium concentration is 35g / L, P content is 0.07g / L, pH value is 11, temperature is 90 DEG C), add 320g of vanadium precipitation wastewater underflow slag (content of ammonium polyvanadate accounts for 92% , pH value is 5), after stirring for 30min, add impurity remover CaCl 2 1.52g, and continuously stirred for 20 minutes, 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 liquid (total vanadium concentration is 25g / L, P content is 0.045g / L, pH value is 9, temperature is 60 DEG C), add 240g of vanadium precipitation waste water underflow slag (content of ammonium polyvanadate accounts for 96%) , pH value is 3), after stirring for 30min, add impurity remover CaCl 2 0.73g, continue to stir and react for 20 minutes, and filter to obtain a high-concentration vanadium solution with a pH value of 6.4 and a vanadium loss of 0.014%.

technical field

[0001] The invention relates to the technical field of vanadium extraction by wet method, and more specifically, relates to a method capable of effectively treating bottom flow slag of vanadium precipitation wastewater and recovering vanadium element and a vanadium extraction process by wet method. Background technique

[0002] The wet vanadium extraction process is a common vanadium metallurgical process. Common wet vanadium extraction processes generally require roasting 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 pretreatment of vanadium raw materials, sodium roasting, water immersion, purification, vanadium precipitation, deammonization and other processes in sequence.

[0003] The supernatant liquid after vanadium precipitation is the main source of wastewater in the vanadium extraction plant. The vanadium precipitation wast...

Examples

example 1

[0031] Take 2L of alkaline vanadium liquid (the concentration of total 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), add 160g of the underflow slag of the vanadium precipitation wastewater (the content of ammonium polyvanadate accounts for 94 %, the pH value is 4.2), after stirring for 30min, add impurity remover CaCl 2 0.54g, and continue to stir and react for 20 minutes, and filter 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 liquid (total vanadium concentration is 35g / L, P content is 0.07g / L, pH value is 11, temperature is 90 DEG C), add 320g of vanadium precipitation wastewater underflow slag (content of ammonium polyvanadate accounts for 92% , pH value is 5), after stirring for 30min, add impurity remover CaCl 2 1.52g, and continuously stirred for 20 minutes, 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 liquid (total vanadium concentration is 25g / L, P content is 0.045g / L, pH value is 9, temperature is 60 DEG C), add 240g of vanadium precipitation waste water underflow slag (content of ammonium polyvanadate accounts for 96%) , pH value is 3), after stirring for 30min, add impurity remover CaCl 2 0.73g, continue to stir and react for 20 minutes, and filter 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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