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A method for recovering soluble titanium dioxide in titanium dioxide waste acid

A technology for titanium dioxide and titanium recovery, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, ferric sulfate, etc., can solve the problems of titanium dioxide yield decline, failure to recycle, and affect the quality of other products, so as to achieve the improvement of total yield and the operation Simple and Actionable Effects

Active Publication Date: 2022-02-01
SICHUAN LOMON TITANIUM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the general disposal method of titanium dioxide waste acid in the sulfuric acid titanium dioxide production process is as follows: 1. Concentrate the titanium dioxide waste acid and configure it into 55% acid, return it to the titanium dioxide production system for acid hydrolysis and premixing of titanium concentrate, However, after this process is concentrated, the soluble TiO in the acid 2 All will be precipitated into ferrous iron and cannot be recovered; 2. Used to prepare ammonium sulfate products and other products; 3. Produce iron-based water purifiers and other products
The above treatment method will cause the yield of titanium dioxide to drop by about 4%, and because titanium dioxide enters other products, it will affect the quality of other products

Method used

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  • A method for recovering soluble titanium dioxide in titanium dioxide waste acid

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Comparison scheme
Effect test

Embodiment 1

[0034] Get concentrated back acid 1kg, add hydrogen peroxide solution (30wt%) 68.6g (TiO 2 / H 2 o 2 =0.5), fully stir, then add 98% sulfuric acid of 0.62kg, the slurry that obtains is carried out pressure filtration, obtain ferrous sulfate and 55% sulfuric acid, the sulfuric acid of 55% that obtains and titanium concentrate are according to 0.65: The mass ratio of 1 is initially mixed into the acidolysis reaction device, and 98% sulfuric acid is added for acidolysis reaction, ensuring that the ratio of sulfuric acid / titanium concentrate is 1.60:1, and the obtained acidolysis titanium solution B is sent for testing.

Embodiment 2

[0036] Get concentrated back acid 1kg, add hydrogen peroxide solution (30wt%) 34.3g (TiO 2 / H 2 o 2 =1), fully stir, then add 98% sulfuric acid of 0.62kg, press filter the slurry obtained, obtain ferrous sulfate and 55% sulfuric acid, the 55% sulfuric acid and titanium concentrate obtained are according to 0.65: The mass ratio of 1 is initially mixed into the acidolysis reaction device, and 98% sulfuric acid is added for acidolysis reaction to ensure that the ratio of sulfuric acid / titanium concentrate is 1.60:1, and the obtained acidolysis titanium liquid C is sent for testing.

Embodiment 3

[0038] Get concentrated back acid 1kg, add hydrogen peroxide solution (30wt%) 17.2g (TiO 2 / H 2 o 2 =2), fully stir, then add 98% sulfuric acid of 0.62kg, press filter the obtained slurry, obtain ferrous sulfate and 55% sulfuric acid, the 55% sulfuric acid and titanium concentrate obtained are according to 0.65: The mass ratio of 1 is initially mixed into the acidolysis reaction device, and 98% sulfuric acid is added for acidolysis reaction to ensure that the ratio of sulfuric acid / titanium concentrate is 1.60:1, and the obtained acidolysis titanium liquid D is sent for testing.

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Abstract

The invention belongs to the technical field of recovery and utilization of titanium white waste acid, and discloses a method for recovering soluble titanium dioxide in titanium white waste acid. 2) add hydrogen peroxide in the concentrated acid, fully stir, then add the sulfuric acid with a mass fraction of 98%, then press filter the slurry to obtain ferrous sulfate and sulfuric acid with a mass fraction of 55%. Acid solution; 3) Mix the acid solution obtained in step 2) with titanium concentrate, and then add sulfuric acid with a mass fraction of 98% to carry out acidolysis reaction to obtain acidolysis titanium solution. This method can improve the soluble TiO in titanium dioxide waste acid 2 The recovery rate makes the titanium yield in the acid hydrolysis process reach more than 95%.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of titanium dioxide waste acid, and in particular relates to a method for recovering soluble titanium dioxide in titanium dioxide waste acid. Background technique [0002] Titanium dioxide, also known as titanium dioxide, scientific name titanium dioxide (TiO 2 ), white powder, non-toxic and harmless, is an important inorganic chemical raw material, its chemical properties are very stable, it has excellent physical properties, optical properties and pigment properties, and has excellent whiteness, refractive index, color reduction power , hiding power, opacity and chalking resistance, it is one of the whitest pigments found in the world at present, and is widely used in coatings, inks, plastics, rubber, paper and other fields. [0003] The industrial production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. At present, because our countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047C01G49/14
CPCC01G23/047C01G49/14
Inventor 池永明钟晓英张玉荣周春勇吴彭森和奔流刘琪琪陈林
Owner SICHUAN LOMON TITANIUM IND CO LTD