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Method for preparing ammonium metavanadate from slag containing vanadium, phosphorus and arsenic

A technology of ammonium metavanadate and arsenic slag is applied in the directions of chemical instruments and methods, vanadium compounds, and process efficiency improvement, which can solve the problems of increasing production costs and long time for precipitation of vanadium, and achieves simple equipment and good economic benefits. , Advanced and reliable process technology

Pending Publication Date: 2022-05-27
宁波双能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention only overcomes the problem of long time for sinking partial vanadium, and does not go deep into the removal of impurities such as phosphorus, arsenic, silicon, aluminum, etc., and is not suitable for ammonium metavanadate produced from sodium vanadate with high impurities
At the same time, the use of ethanol also increases the production cost

Method used

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  • Method for preparing ammonium metavanadate from slag containing vanadium, phosphorus and arsenic

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: A method for preparing ammonium metavanadate in vanadium-containing phosphorus-arsenic slag, the process can refer to figure 1 , including the following steps:

[0026] Step 1. In a 1000ml beaker, dissolve the phosphorus-arsenic slag containing sodium vanadate, sodium phosphate, sodium arsenate, sodium silicate, sodium aluminate, sodium hydroxide and moisture components at a solid-to-liquid mass ratio of 2.0:5.0 Make an aqueous solution A1 in water, add 200g of phosphorus and arsenic slag, add 500ml of water, stir at constant temperature when dissolving, keep the speed at 60r / min, and keep the temperature at 45°C;

[0027] Among them, the phosphorus arsenic slag contains 20.1% by mass of sodium vanadate, 8.1% by mass of sodium phosphate, 3.2% by mass of sodium arsenate, 3.8% by mass of sodium silicate, 12.4% by mass of sodium aluminate, 6.0% by mass of hydrogen Sodium oxide, the balance is water.

[0028] Step 2: Add 38 g of concentrated sulfuric acid to th...

Embodiment 2

[0040] Example 2: A method for preparing ammonium metavanadate in vanadium-containing phosphorus-arsenic slag, the process can refer to figure 1 , need to use the aqueous solution D1 in the embodiment 1 in the present embodiment, specifically comprise the following steps:

[0041] Step 1. In a 1000ml beaker, dissolve the phosphorus-arsenic slag containing sodium vanadate, sodium phosphate, sodium arsenate, sodium silicate, sodium aluminate, sodium hydroxide and moisture components at a solid-to-liquid mass ratio of 2.0:5.0 Prepare aqueous solution A2 in aqueous solution D, add 200g of phosphorus and arsenic slag, add 500ml of aqueous solution D1, stir at constant temperature during dissolution, keep the speed at 60r / min, and keep the temperature at 35°C;

[0042] Among them, the phosphorus arsenic slag contains 20.1% by mass of sodium vanadate, 8.1% by mass of sodium phosphate, 3.2% by mass of sodium arsenate, 3.8% by mass of sodium silicate, 12.4% by mass of sodium aluminate,...

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Abstract

The invention discloses a method for preparing ammonium metavanadate from slag containing vanadium, phosphorus and arsenic. The method comprises the following steps that firstly, the phosphorus and arsenic slag is dissolved in water according to the solid-liquid mass ratio of 1.0: (2.0-3.0), and an aqueous solution A is prepared; step 2, adding sulfuric acid into the aqueous solution A to react to generate a precipitate, controlling the pH value of the solution at 8.0-9.0, and filtering the precipitate to obtain an aqueous solution B; 3, adding ammonium salt into the aqueous solution B, keeping the temperature of the solution at 40-60 DEG C, stirring for reaction, aging, and filtering to obtain wet ammonium metavanadate and an aqueous solution C; 4, magnesium salt or calcium salt is added into the water solution C, phosphorus and arsenic in the solution are filtered out in a precipitation mode after reaction, and meanwhile a water solution D is obtained; and 5, adding deionized water into the wet ammonium metavanadate obtained in the step 3, stirring, heating, washing, filtering and drying to obtain an ammonium metavanadate finished product. The method has the advantages of low input cost, good impurity removal effect, improvement of the quality of ammonium metavanadate and improvement of the recovery rate of vanadium.

Description

technical field [0001] The invention relates to a method for preparing ammonium metavanadate, in particular to a method for preparing ammonium metavanadate from vanadium-containing phosphorus-arsenic slag. Background technique [0002] The by-products of the alumina industry will produce miscellaneous salts composed of sodium vanadate, sodium phosphate, sodium arsenate, sodium silicate and aluminum hydroxide, commonly known as vanadium-containing phosphorus and arsenic slag. Vanadium is used in steel, chemical, ceramics and even aviation As an important metal element widely used in the aerospace field, for industrial waste slag containing vanadium, it is necessary to extract and recycle the vanadium in the slag, which can reduce the waste of resources and reduce the damage to the environment. At present, the extraction of vanadium from slag generally adopts the wet leaching process, but due to the high impurity content of phosphorus, arsenic, silicon, and aluminum in vanadiu...

Claims

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Application Information

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IPC IPC(8): C22B34/22C01G31/00C22B3/44
CPCC22B34/22C22B3/44C01G31/00Y02P10/20
Inventor 罗智军周朝辉庞君保甘小强
Owner 宁波双能环保科技有限公司