Method for clean production of vanadium pentoxide

A vanadium pentoxide and clean production technology, applied in the field of clean production of vanadium pentoxide, can solve the problems of difficult comprehensive utilization, troughing, complicated procedures, etc., and achieve the effects of realizing full recycling, reducing production costs, and being easy to industrialize.

Active Publication Date: 2015-02-18
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

(2) During the sodium roasting process, harmful gases HCl and Cl will be decomposed 2 , SO 2 and SO 3 etc., pollute the environment and corrode equipment; the melting point of sodium salt is low, and it is easy to form rings and stick to the furnace during the roasting process, which affects the conversion rate of vanadium; the addition of sodium salt is large, and the production cost is high; (3) the tailings of sodium vanadium extraction contain alkali High (about 5%), it has been difficult to comprehensively utilize. Tailing slag ingredients in ironmaking will cause nodules in the blast furnace, deteriorate the air permeability of the blast furnace material column, erode the furnace lining, and affect the operation of the blast furnace
(5) Roasting with sodium salt - it is difficult to recycle the mother liquor of vanadium precipitation after ammonium salt precipitation
Due to the high sodium content in the vanadium precipitation mother liquor, and the sodium will continue to enrich during the circulation process, it is necessary to add more ammonium sulfate in the vanadium precipitation process, and the accumulation of a large amount of sulfate will increase the viscosity of the vanadium-containing solution. During the process, the phenomenon of "sinking" occurs. At present, the vanadium precipitation wastewater of vanadium production enterprises adopts the method of terminal treatment, and it is discharged directly after the removal of vanadium, chromium and neutralization treatment, but this will salinize the surrounding land and affect the growth of plants. , destroy the ecological e

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  • Method for clean production of vanadium pentoxide

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Embodiment 1

[0036] A method for cleanly producing vanadium pentoxide, comprising the steps of:

[0037] Step 1, raw material pretreatment: crush high-calcium vanadium slag to 200-260 mesh, add CaO to mix evenly, add water, and make raw meal balls with a particle size of 8-12mm; wherein, the mass ratio m 1 :m 2 is 0.42, mass ratio m 3 :m 4 is 0.02;

[0038] Step 2, roasting: heating the raw material balls to 800 °C at a heating rate of 4 °C / min, and keeping the temperature for 120 min to obtain roasted clinker balls;

[0039] Step 3, dilute acid leaching: the roasted clinker balls are crushed to 100-160 mesh, leached with dilute sulfuric acid solution, filtered to obtain vanadium leaching solution and vanadium extraction tailings, the vanadium extraction rate is 93.5%; vanadium extraction tailings are washed with water, and the washing water It can be used as the next dilute acid leaching roasting clinker leaching agent; among them, the concentration of dilute sulfuric acid solution is...

Embodiment 2

[0047]A method for cleanly producing vanadium pentoxide, comprising the steps of:

[0048] Step 1, raw material pretreatment: crush high-calcium vanadium slag to 200-400 mesh, add CaCO 3 Mix evenly and add water to make raw meal balls with a particle size of 9-12mm; among them, the mass ratio m 1 :m 2 is 1.0, the mass ratio m 3 :m 4 is 0.03;

[0049] Step 2, roasting: heating the raw material balls to 950 °C at a heating rate of 5 °C / min, and keeping the temperature for 15 minutes to obtain roasted clinker balls;

[0050] Step 3, dilute acid leaching: the roasted clinker balls are crushed to 160-200 mesh, leached with dilute sulfuric acid solution, filtered to obtain vanadium leaching solution and vanadium extraction tailings, the leaching rate is 93.3%; the vanadium extraction tailings are washed with water, and the washing water can be As the next dilute acid leaching roasting clinker leaching agent; wherein, the concentration of dilute sulfuric acid solution is 10%, th...

Embodiment 3

[0057] A method for cleanly producing vanadium pentoxide, comprising the steps of:

[0058] Step 1, raw material pretreatment: crush high-calcium vanadium slag to 200-300 mesh, add CaO to mix evenly, add water, and make raw meal balls with a particle size of 8-10mm; wherein, the mass ratio m 1 :m 2 is 0.5, mass ratio m 3 :m 4 is 0.04;

[0059] Step 2, roasting: heating the raw material balls to 850 °C at a heating rate of 1 °C / min, and keeping the temperature for 200 min to obtain roasted clinker balls;

[0060] Step 3, dilute acid leaching: the roasted clinker balls are crushed to 160-200 mesh, leached with dilute sulfuric acid solution, filtered to obtain vanadium leaching solution and vanadium extraction tailings, the leaching rate is 93.2%; the vanadium extraction tailings are washed with water, and the washing water can be As the next dilute acid leaching roasting clinker dissolution agent; wherein, the concentration of dilute sulfuric acid solution is 20%, the liquid...

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Abstract

The invention discloses a method for the clean production of vanadium pentoxide, and belongs to the field of production of vanadium oxide. The method comprises the steps of raw material pretreatment, roasting, diluted acid leaching, vanadium liquid purification, vanadium precipitation, pyrolysis, recovery of Mn in residual vanadium precipitation liquid and the like. According to the method, the discharge of the residual vanadium precipitation liquid is avoided, and vanadium extraction tailings do not contain Na and K, and can be returned to a blast furnace or directly reduced to realize the comprehensive recycling of resources; the total recovery rate of vanadium is higher than that of a conventional sodium salt roasting-water leaching vanadium extraction process in the industry, the V2O5 content of a product is higher than 98 percent, the production cost is lower than that of a process for the sodium treatment vanadium extraction preparation of vanadium pentoxide, and meanwhile, the residual vanadium precipitation liquid can be completely recycled, and the vanadium extraction tailings can be secondarily and comprehensively utilized.

Description

technical field [0001] The invention belongs to the field of vanadium oxide production, in particular to a method for clean production of vanadium pentoxide. Background technique [0002] For vanadium-titanium magnetite, vanadium slag, steel slag and other raw materials for extracting vanadium, most of the industry currently uses the traditional sodium roasting-water immersion process to produce vanadium pentoxide, and the sodium salt additives are NaCl, Na 2 SO 4 、Na 2 CO 3 and NaNO 3 The combination of one or several sodium salts in the medium is evenly mixed with the vanadium-containing material and then roasted at high temperature. The roasting temperature is 700-800°C. The amount of sodium salt added is 10%-20% by weight. The conversion of low-priced vanadium in the vanadium raw material It is pentavalent vanadium, which combines with sodium in the additive to form sodium vanadate which is soluble in water. The roasted clinker is leached with water, and after solid...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B34/22C22B47/00
CPCY02P10/20
Inventor 张力张菊花
Owner NORTHEASTERN UNIV
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