Comprehensive utilization method of waste acids of titanium dioxide industry

Abstract

The invention discloses a comprehensive utilization method of waste acids of the titanium dioxide industry, relates to a method of comprehensively utilizing and recovering waste acids of the titanium dioxide industry and directly producing sulfuric acid method titanium dioxide from non-blast furnace titanium slag, and belongs to the technical field of titanium non-acid treatment. Titanium slag generated through direct reduction of vanadium-titanium magnetite ores is taken as the raw material, neutralizing agent, and capturing agent of titanium hydrolysis and precipitation, through oxidation and hydrolysis, titanium in the waste acids of the titanium dioxide industry is precipitated and enriched in the optimized titanium slag; at the same time, rare metals such as vanadium, scandium, and the like, is extracted and dissolved in the solution so as to obtain a titanium poor solution containing rare metals such as vanadium, scandium, and the like, the titanium poor solution is extracted or subjected to ion exchange so as to recover vanadium, scandium, and the like; the optimized titanium slag is applied to titanium dioxide production through a sulfuric acid method; and the waste acids generated during the titanium dioxide production are returned and cyclically used. The problems of waste acid discharge and environmental pollution of sulfuric acid method titanium dioxide production are radically solved; and the provided method has the advantages that the titanium dioxide product quality is good, the titanium recovery rate is high, and rare elements such as vanadium, scandium, and the like, can be comprehensively recovered.

Description

technical field

[0001] The invention belongs to the technical field of titanium dioxide production by sulfuric acid method and waste acid treatment, and relates to a method for comprehensive utilization of titanium dioxide waste acid, in particular to the use of titanium dioxide waste acid to directly reduce titanium slag by treating vanadium-titanium magnetite, and comprehensively recovering titanium, Method for vanadium, scandium, aluminium. Background technique

[0002] At present, the production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. Due to the ore grade and technology in our country, most of the enterprises in our country use the sulfuric acid method to produce titanium dioxide. The process of producing titanium dioxide by sulfuric acid method produces a large amount of waste acid. For every 1t of titanium dioxide produced, 8-10t waste acid is discharged. The waste acid contains 15%-25% sulfuric acid and 10%-15% ferrous...

Examples

Embodiment 1

[0032] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 25% and titanium of 5 g / L was added at a solid-liquid mass ratio of 1:5, and the reaction was stirred at 90 ° C for 12 h. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and a titanium-depleted liquid containing 0.2 g / L of titanium and 45 g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 65%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.8, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After the ...

Embodiment 2

[0034] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 20% and titanium of 8 g / L was added at a solid-liquid mass ratio of 1:5, and the reaction was stirred at 100 ° C for 12 h. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and the titanium-depleted liquid containing 0.2g / L of titanium and 25g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 75%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.6, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After the...

Embodiment 3

[0037] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 20% and titanium of 8g / L was added at a solid-liquid mass ratio of 1:3, and the reaction was stirred at 150 ° C for 4 hours. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and a titanium-depleted liquid containing 0.2 g / L of titanium and 15 g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 85%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.6, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After t...

technical field

[0001] The invention belongs to the technical field of titanium dioxide production by sulfuric acid method and waste acid treatment, and relates to a method for comprehensive utilization of titanium dioxide waste acid, in particular to the use of titanium dioxide waste acid to directly reduce titanium slag by treating vanadium-titanium magnetite, and comprehensively recovering titanium, Method for vanadium, scandium, aluminium. Background technique

[0002] At present, the production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. Due to the ore grade and technology in our country, most of the enterprises in our country use the sulfuric acid method to produce titanium dioxide. The process of producing titanium dioxide by sulfuric acid method produces a large amount of waste acid. For every 1t of titanium dioxide produced, 8-10t waste acid is discharged. The waste acid contains 15%-25% sulfuric acid and 10%-15% ferrous...

Examples

Embodiment 1

[0032] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 25% and titanium of 5 g / L was added at a solid-liquid mass ratio of 1:5, and the reaction was stirred at 90 ° C for 12 h. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and a titanium-depleted liquid containing 0.2 g / L of titanium and 45 g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 65%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.8, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After the ...

Embodiment 2

[0034] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 20% and titanium of 8 g / L was added at a solid-liquid mass ratio of 1:5, and the reaction was stirred at 100 ° C for 12 h. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and the titanium-depleted liquid containing 0.2g / L of titanium and 25g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 75%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.6, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After the...

Embodiment 3

[0037] Titanium slag with a particle size of less than 74 μm and accounting for 90% was finely ground, and titanium dioxide waste acid with a mass concentration of sulfuric acid of 20% and titanium of 8g / L was added at a solid-liquid mass ratio of 1:3, and the reaction was stirred at 150 ° C for 4 hours. The leached pulp was filtered to obtain the optimized titanium slag with water content of 10% and a titanium-depleted liquid containing 0.2 g / L of titanium and 15 g / L of sulfuric acid. The aluminum dissolution rate in the titanium slag was 85%, and then the optimized titanium slag was added into the The acidolysis reaction is carried out in the acidolysis tank of concentrated sulfuric acid. The acid-to-ore ratio of the acidolysis process is 1.6, the concentration of sulfuric acid is 98%, and the acidolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured, and the curing temperature is 200° C., and the curing holding time is 2h. After t...

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