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Method for pelletizing and vanadium extracting from vanadium extraction tailings

A technology for extracting vanadium tailings and making pellets, which is applied in the field of vanadium metallurgy, can solve problems such as low vanadium extraction rate, lower roasting conversion rate, and deterioration of equipment working conditions, and achieve the effect of stable and controllable roasting equipment and reduced roasting time

Inactive Publication Date: 2020-08-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent document CN109825723A discloses a method for deep extraction of vanadium by using alkaline tailings. In this method, alkaline tailings are directly used as raw materials and mixed with vanadium-containing materials for roasting reaction-water extraction of vanadium; patent document CN107586948A discloses a vanadium The deep vanadium extraction method of slag, in this method, the vanadium slag and sodium carbonate are roasted and then soaked in water, the tailings are soaked with acid, and the two solutions obtained are mixed to extract vanadium. The above two methods have long process, low vanadium yield, Defects such as high impurity content entering the leachate and high environmental protection pressure are only in the research stage
[0004] The industrialized deep vanadium extraction method is "tailings-drying-addition of other vanadium-containing materials-sodium roasting or blank roasting-hot water leaching to extract vanadium". However, there are still two major technical problems. First, the vanadium in the tailings can only be reduced from about 1.0% to about 0.6%, the vanadium extraction rate is low, and the remaining vanadium content in the tailings is high; For the high extraction rate of medium vanadium, mixing other vanadium-containing materials with tailings, increasing the roasting temperature and adding sodium salt additives are effective means, but when the roasting temperature is higher than 780 ° C, low melting point phases are likely to appear in the roasting equipment, resulting in Material sticking and agglomeration, deterioration of equipment working condition, reduction of roasting conversion rate
[0005] In order to solve the contradiction between the high extraction rate of vanadium and the working conditions of the equipment, the industry often adopts the method of reducing the vanadium content in the roasting raw materials, lowering the roasting temperature, and prolonging the roasting time. Although this contradiction can be alleviated, the operating efficiency and the vanadium extraction rate are reduced. still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 1kg of sodiumized roasting water leaching vanadium tailings, the vanadium content is 0.92%, and the vanadium-titanium magnetite particle size is 81.03% 0.2kg through a 120 mesh sieve, and the two are evenly mixed and dried until the moisture content is 4.86%. Mixture 1 is obtained; mixture 1 and sodium carbonate are mixed according to the mass ratio of sodium and vanadium elements of 1.4 to obtain mixture 2; the bonding solution is carried out according to the mass ratio of sodium hydroxide, humic acid and water of 0.1:1.0:18.0 According to the preparation of wet pellets with a water content of 15-20%, the bonding solution is mixed with the mixture 2 and the wet pellets are pressed to control the particle size of the wet pellets to 25-30mm, and the moisture content after drying is 3.65%; The dry balls were roasted at 870°C for 30 minutes, and the roasted clinker was crushed until the particle size passed a 120-mesh sieve, accounting for 82.02%. The liquid-solid rati...

Embodiment 2

[0045]Take 1kg of sodiumized roasting water leaching vanadium tailings, the vanadium content is 0.88%, and the vanadium-titanium magnetite particle size is 82.30% 0.4kg through a 120 mesh sieve, and the two are evenly mixed and dried until the moisture content is 4.93%. Mixture 1 is obtained; mixture 1 and sodium carbonate are mixed according to the mass ratio of sodium and vanadium elements of 0.8 to obtain mixture 2; the bonding solution is carried out according to the mass ratio of sodium hydroxide, humic acid and water of 0.1:1.0:11.0 According to the preparation of wet pellets with a water content of 15-20%, the bonding solution is mixed with the mixture 2 and the wet pellets are pressed to control the particle size of the wet pellets to 10-20mm, and the moisture content after drying is 1.05%. Dry balls were roasted at 800°C for 60 minutes, and the calcined clinker was crushed to a particle size of 82.36% through a 120-mesh sieve. The liquid-solid ratio was controlled at (...

Embodiment 3

[0047] Take 1kg of sodiumized roasting water leaching vanadium tailings, the vanadium content is 1.02%, take the converter vanadium slag with a particle size of 120 mesh sieve and the proportion is 81.35% 0.3kg, mix the two evenly and dry until the water content is 3.13%, to obtain a mixed Material 1; Mixture 1 and sodium carbonate are mixed according to the mass ratio of sodium and vanadium elements of 1.2 to obtain Mixture 2; the bonding solution is prepared according to the mass ratio of sodium hydroxide, humic acid and water at 0.1:1.0:15.0 According to the water content of the wet pellets is 15-20%, the bonding solution is mixed with the mixture 2 and the wet pellets are pressed, the particle size of the wet pellets is controlled to be 10-20mm, and the moisture content after drying is 0.52%; the dry pellets after drying Roast at 850°C for 50 minutes, the calcined clinker is crushed until the particle size exceeds 120 mesh sieve, accounting for 81.06%, the liquid-solid rati...

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Abstract

The invention belongs to the technical field of vanadium metallurgy, and particularly relates to a method for pelletizing and vanadium extracting from vanadium extraction tailings. The technical problem to be solved is to provide the method for pelletizing and vanadium extracting from the vanadium extraction tailings, and the method can reduce the vanadium content in leached residues. The method comprises the following steps of a, uniformly mixing a vanadium-containing material with the vanadium extraction tailings, and drying to obtain a mixture 1; b, mixing the mixture 1 with sodium salt toobtain a mixture 2, preparing a bonding solution by using sodium hydroxide, a binder and water, and mixing the mixture 2 with the bonding solution to obtain wet pellets; and c, drying, roasting and leaching the wet pellets. By the adoption of the method, the vanadium content in the leached residues can be reduced to 0.3% or below.

Description

technical field [0001] The invention belongs to the technical field of vanadium metallurgy, and in particular relates to a method for extracting vanadium by pelletizing tailing slag. Background technique [0002] Converter vanadium slag is the main raw material for the production of vanadium oxide. The traditional process for extracting vanadium from converter vanadium slag is "vanadium slag-sodium roasting-hot water leaching to extract vanadium". Part of the slag returns to the roasting system, and part of it continues to extract vanadium in depth. In order to realize the deep vanadium extraction of tailings, domestic and foreign production enterprises and scientific research units have studied the secondary sodium roasting fire process of tailings and wet processes such as tailings high-acid leaching, tailings pressurized oxidative acid leaching, and alkali leaching. [0003] Patent document CN109825723A discloses a method for deep extraction of vanadium by using alkaline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B1/248C22B1/16C22B3/04
CPCC22B1/16C22B1/2406C22B1/248C22B3/04C22B34/22Y02P10/20
Inventor 郭继科申彪李明蒋霖
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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