A kind of method that adds crystal seed and prepares ammonium metavanadate

A technology of ammonium metavanadate and seed crystals, which is applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of high vanadium content and long vanadium precipitation time, and achieve low equipment requirements, shortened reaction time, and vanadium The effect of liquid composition requirement relaxation

Active Publication Date: 2015-09-16
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of adding ammonium salt after stripping in this patent document also has industrial problems such as high vanadium content in waste liquid and long time for vanadium precipitation, which fails to fundamentally solve the problem of ammonium metavanadate preparation

Method used

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  • A kind of method that adds crystal seed and prepares ammonium metavanadate
  • A kind of method that adds crystal seed and prepares ammonium metavanadate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Add 1000mL of common vanadium liquid in Table 1 to a 2000mL clean beaker, adjust the pH value to 10.0 with sulfuric acid, add 1.70g ammonium polyvanadate at room temperature, dissolve the seeds according to the NH 4 + / V=1 Add ammonium sulfate, after the ammonium sulfate dissolves into the vanadium solution, react for 60 minutes, then filter to obtain wet ammonium metavanadate, put the wet ammonium metavanadate in an oven at 50°C for drying, the drying time for 12 hours. The vanadium content in the vanadium precipitation supernatant liquid was detected to be 0.34g / L, and the vanadium precipitation rate was 99%.

example 2

[0036] Add 1000mL of common vanadium liquid in Table 1 to a 2000mL clean beaker, adjust the pH value to 8.0 with sulfuric acid, add 0.3g ammonium polyvanadate at room temperature, 4 + / V=4 Add ammonium sulfate, after the ammonium sulfate dissolves into the vanadium solution, react for 30 minutes, then filter to obtain wet ammonium metavanadate, put the wet ammonium metavanadate into an oven at 50°C for drying, the drying time for 12 hours. The vanadium content in the vanadium precipitation supernatant liquid was detected to be 0.28g / L, and the vanadium precipitation rate was 99.2%.

example 3

[0038] Add 1000mL of common vanadium liquid in Table 1 to a 2000mL clean beaker, adjust the pH value to 9.0 with sulfuric acid, add 1.0g of sodium polyvanadate at room temperature, 4 + / V=2 Add ammonium sulfate, after the ammonium sulfate dissolves into the vanadium solution and react for 50 minutes, filter to obtain wet ammonium metavanadate, put the wet ammonium metavanadate into an oven at 50°C for drying, the drying time is 12 hours. The vanadium content in the vanadium precipitation supernatant was detected to be 0.17g / L, and the vanadium precipitation rate was 99.5%.

[0039] Composition / g L -1

[0040]

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Abstract

The invention provides a method for preparing ammonium metavanadate by adding seed crystals. The method includes the following steps which are conducted in sequence that pH of purification solutions containing vanadium is adjusted to 7-12, and then the purification solutions containing the vanadium are cooled to be at the normal temperature; the seed crystals are added to the purification solutions containing the vanadium, and crystallizing agents are added to the purification solutions containing vanadium for reaction after the seed crystals are completely dissolved, wherein the seed crystals are soluble polyvanadate, the crystallizing agents are inorganic ammonium salt, and the addition of the crystallizing agents is determined according to the mole ratio of 1:4 of NH4+ in the crystals to V elements in the solutions; wet ammonium metavanadate is obtained through filtration and is dried to obtain powdery ammonium metavanadate. The method has the advantages that the process is simple and easy to use, the requirement for vanadium solution components is low, the requirement for equipment is low, operation is convenient to carry out and cost is low; reaction time can be shortened to 30-60 min, even 30-45 min, and consequently, the production rhythm can be quickened, and energy consumption can be reduced.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction chemical industry, and specifically relates to a technique for preparing ammonium metavanadate for vanadium precipitation by adding crystal seeds. Background technique [0002] Usually, ammonium metavanadate is light yellow or white crystal, mainly used as chemical reagent, catalyst, drier, mordant, etc. It is widely used in ceramic industry as glaze, and can also be used to prepare vanadium pentoxide. The method of producing ammonium metavanadate in industry is mainly to add ammonium chloride or ammonium sulfate to the purified sodium vanadate solution to obtain ammonium metavanadate precipitation: NaVO 3 +NH 4 Cl=NH 4 VO 3 ↓+NaCl. [0003] However, due to the relatively large solubility of ammonium metavanadate in water, the content of vanadium in the waste liquid is relatively high (1-2.5 g / L V 2 o 5 ), the entire operation time is longer (for example, up to about 120min), and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00
Inventor 殷兆迁彭毅付自碧李千文
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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