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A method for preparing high-purity scandium by using calcium carbide slag to neutralize waste titanium dioxide acid in one step

A technology of titanium dioxide waste acid and calcium carbide slag, applied in the direction of improving process efficiency, can solve the problems of waste acid pollution, low scandium recycling rate, etc., and achieve large market demand, good social and ecological benefits, and low production costs. Effect

Active Publication Date: 2017-06-16
CHALCO GUANGXI RARE EARTH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low recovery rate of scandium in titanium white waste acid and serious waste acid pollution, and provide a method for preparing high-purity scandium by using calcium carbide slag to neutralize titanium white waste acid in one step

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing high-purity scandium by using calcium carbide slag to neutralize titanium dioxide waste acid in one step, comprising the following steps:

[0031] (1) One-step neutralization: mix and stir titanium dioxide waste acid and carbide slag with a calcium hydroxide content of 55% at a liquid-solid ratio of 1:3, carry out neutralization reaction for 1.5 hours, and control the pH value at the end of the reaction to 2.5. neutralizing solution;

[0032] (2) Pressure filtration: the neutralization liquid is filtered through a filter press to obtain filtrate and filter residue;

[0033] (3) Concentration: The filtrate was heated and concentrated in steam at 80°C for 2 hours to make the scandium concentration ≥ 60 ppm to obtain a concentrated solution;

[0034] (4) Removal of impurities: add organic solvent N235 to the concentrated solution with an O / A ratio of 1: 3, react for 5 hours, extract iron and aluminum in the solution, remove impurities in the liquid ...

Embodiment 2

[0041] A method for preparing high-purity scandium by using calcium carbide slag to neutralize titanium dioxide waste acid in one step, comprising the following steps:

[0042] (1) One-step neutralization: mix and stir the waste titanium dioxide acid and carbide slag with a calcium hydroxide content of 50% at a liquid-solid ratio of 1:2, carry out neutralization reaction for 1.5 hours, and control the pH value at the end of the reaction to 1.0. neutralizing solution;

[0043] (2) Pressure filtration: the neutralization liquid is filtered through a filter press to obtain filtrate and filter residue;

[0044] (3) Concentration: heat and concentrate the filtrate in steam at 80°C for 2 hours to make the concentration of scandium ≥ 60 ppm to obtain a concentrated solution;

[0045] (4) Impurity removal: add organic solvent N235 to the concentrated solution with an O / A ratio of 1:2, react for 5 hours, extract iron and aluminum in the solution, remove impurities in the liquid phase,...

Embodiment 3

[0052] A method for preparing high-purity scandium by using calcium carbide slag to neutralize titanium dioxide waste acid in one step, comprising the following steps:

[0053] (1) One-step neutralization: mix and stir titanium dioxide waste acid and carbide slag with a calcium hydroxide content of 80% at a liquid-solid ratio of 1:4, carry out neutralization reaction for 2 hours, and control the pH value at the end of the reaction to 2.5. neutralizing solution;

[0054] (2) Pressure filtration: the neutralization liquid is filtered through a filter press to obtain filtrate and filter residue;

[0055] (3) Concentration: The filtrate was heated and concentrated in steam at 100°C for 4 hours to make the scandium concentration ≥ 60 ppm to obtain a concentrated solution;

[0056] (4) Impurity removal: add organic solvent N235 to the concentrated solution with an O / A ratio of 1: 3, react for 8 hours, extract iron and aluminum in the solution, remove impurities iron and aluminum in...

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Abstract

The invention relates to a method for preparing high-purity scandium by using calcium carbide slag to neutralize waste titanium white acid in one step. The method includes one-step neutralization, pressure filtration, concentration, impurity removal, extraction, acid dissolution, secondary acid dissolution and double salt precipitation , oxalic acid precipitation, recovery and other steps to obtain scandium oxide with a purity of 99.9~99.99%, and the recovery rate of scandium element is ≥80%. The invention realizes efficient recovery and high-purity preparation of scandium element in titanium white waste acid, not only realizes the recycling of two wastes, but also greatly reduces environmental protection operation costs. The product scandium oxide has a large market demand and high value, and has a good social, ecological and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for preparing high-purity scandium by using calcium carbide slag to neutralize waste titanium white acid in one step. Background technique [0002] Scandium and its compounds are mainly used in the fields of national defense, metallurgy, chemical industry, aerospace, superconductivity, laser, nuclear energy and electronics, and are important strategic substances. However, due to its high price, the civilian consumption of scandium is very limited. In recent years, the research field of new energy has made rapid progress. Countries such as the United States and Japan have made breakthroughs in the application of scandium-zirconium oxide electrolytes in solid oxide fuel cell SOFC. The performance of civil scandium products has been greatly improved, and its processing and operating costs have been significantly reduced. The commercialization prospects o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 韦世强胡谷华胡振光杨桂林秦文忠彭新林黄华勇卢阶主许旭升庄辉江泽佐羊多彦李飞龙蒋超超况涛张亮玖
Owner CHALCO GUANGXI RARE EARTH DEV CO LTD
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