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A method for comprehensive utilization of titanium dioxide waste acid

A technology of titanium white waste acid and titanium dioxide, which is applied in the fields of titanium white waste acid treatment of vanadium-titanium magnetite, direct reduction of titanium slag, comprehensive utilization of titanium white waste acid, and comprehensive recovery of titanium, aluminum, scandium, and vanadium, which can solve the problem of processing Or problems such as high recycling cost, poor quality of titanium dioxide products, and difficulties in the comprehensive utilization of titanium slag directly reduced by vanadium-titanium magnetite

Active Publication Date: 2018-08-14
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the production of titanium dioxide by needle sulfuric acid method in the present invention, the cost of waste acid treatment or reuse is high, titanium cannot be recovered, and it is difficult to comprehensively utilize titanium slag directly reduced by vanadium-titanium magnetite, and the quality of titanium white products is poor. Combined treatment with direct reduction titanium slag, that is, use direct reduction titanium slag as neutralizer and collector for titanium hydrolysis and precipitation in titanium white waste acid, enrich titanium in waste acid into titanium slag, and use waste acid The sulfuric acid dissolves most of the aluminum, vanadium and scandium in the titanium slag, so that the titanium slag is purified and enriched, and the titanium-poor solution and optimized titanium slag are obtained by filtration; the obtained titanium-depleted solution is recovered by recycling rare elements such as vanadium and scandium After the aluminum is returned to the system for recycling; the obtained optimized titanium slag is acidified and matured with concentrated sulfuric acid, and then subjected to water immersion, concentration, hydrolysis, roasting and other processes to produce titanium dioxide, and the waste acid produced by the hydrolysis of the titanium solution is returned for recycling

Method used

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  • A method for comprehensive utilization of titanium dioxide waste acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The titanium slag that is finely ground to a particle size of 74 μm or less, accounting for 90%, is added with a mass concentration of sulfuric acid of 25% and titanium white waste acid of 5g / L at a solid-to-liquid mass ratio of 1:5, and stirred and reacted at 90°C for 12 hours. Press filter the leached pulp to obtain optimized titanium slag containing 10% water and titanium-poor solution containing 0.2g / L titanium and 45g / L sulfuric acid. The aluminum dissolution rate in titanium slag is 65%, and then the optimized titanium slag is added to the The acid hydrolysis reaction is carried out in the acid hydrolysis tank of concentrated sulfuric acid, the acid ore ratio of the acid hydrolysis process is 1.8, the sulfuric acid concentration is 98%, and the acid hydrolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured and then matured. The curing temperature is 200° C. and the curing time is 2 hours. After the aging is completed, wa...

Embodiment 2

[0034] The titanium slag that is finely ground to a particle size of 74 μm or less, accounting for 90%, is added to the titanium white waste acid with a mass concentration of sulfuric acid of 20% and titanium 8g / L at a solid-to-liquid mass ratio of 1:5, and is stirred and reacted at 100°C for 12 hours. Press filter the leached pulp to obtain optimized titanium slag containing 10% water and titanium-poor solution containing 0.2g / L titanium and 25g / L sulfuric acid. The aluminum dissolution rate in titanium slag is 75%, and then the optimized titanium slag is added to the The acid hydrolysis reaction is carried out in the acid hydrolysis tank of concentrated sulfuric acid, the acid ore ratio of the acid hydrolysis process is 1.6, the sulfuric acid concentration is 98%, and the acid hydrolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured and then matured. The curing temperature is 200° C. and the curing time is 2 hours. After the aging...

Embodiment 3

[0037] The titanium slag that is finely ground to a particle size of 74 μm or less, accounting for 90%, is added to the titanium white waste acid with a mass concentration of sulfuric acid of 20% and titanium 8g / L at a solid-to-liquid mass ratio of 1:3, and is stirred and reacted at 150°C for 4h. Press filter the leached pulp to obtain optimized titanium slag containing 10% water and titanium-poor solution containing 0.2g / L titanium and 15g / L sulfuric acid. The aluminum dissolution rate in titanium slag is 85%, and then the optimized titanium slag is added to the The acid hydrolysis reaction is carried out in the acid hydrolysis tank of concentrated sulfuric acid, the acid ore ratio of the acid hydrolysis process is 1.6, the sulfuric acid concentration is 98%, and the acid hydrolysis temperature is 180°C. After the acid hydrolysis reaction is completed, the slurry is cured and then matured. The curing temperature is 200° C. and the curing time is 2 hours. After the aging is co...

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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 sulfuric acid titanium dioxide production 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 treat vanadium-titanium magnetite, directly reduce titanium slag, and comprehensively recover titanium, Methods for vanadium, scandium, aluminum. Background technique [0002] At present, the production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. Due to my country's ore grade and technical reasons, most enterprises in my country use the sulfuric acid method for the production of titanium dioxide. The production of titanium dioxide by the sulfuric acid method produces a large amount of waste acid, and 8 to 10 tons of waste acid is discharged for every 1 ton of titanium dioxide produced. The waste acid contains 15% to 25% of sulfuric acid and 10% to 15%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C01F7/76C01F17/00C01G31/00C01G15/00
CPCC01F7/765C01F17/10C01G15/003C01G23/0532C01G31/003
Inventor 蒋训雄赵磊王爱平王政林江顺汪胜东蒋伟
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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