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Method for concentrating titanium pigment waste acid

A technology of titanium dioxide waste acid and titanium dioxide, applied in chemical instruments and methods, iron sulfate, sulfur trioxide/sulfuric acid, etc., can solve the problems affecting the use value of sulfuric acid in the concentration process, the degree of popularization and utilization is not high, and the efficiency is low , to achieve the effect of low processing cost, simple and easy process flow, and avoiding environmental pollution

Inactive Publication Date: 2009-09-09
SICHUAN UNIV +1
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Problems solved by technology

But the efficiency is low, it is not easy to realize industrialization, and the degree of popularization and utilization is not high
[0009] Since the waste acid mainly contains 10% to 20% ferrous sulfate, this seriously affects the implementation of the concentration process and the use value of concentrated sulfuric acid

Method used

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  • Method for concentrating titanium pigment waste acid
  • Method for concentrating titanium pigment waste acid
  • Method for concentrating titanium pigment waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The titanium dioxide waste acid with a sulfuric acid concentration of 18.5% contains ferrous sulfate (7.8%), vacuumize at room temperature 15°C to reduce the pressure to an absolute pressure of 600Pa for 2 hours, so that a large amount of water in the acid solution evaporates, and the ferrous sulfate Gradually crystallize and precipitate, and concentrate the acid solution; separate the ferrous sulfate crystals from the acid solution; age and precipitate the separated acid solution, and separate the heavy metal precipitate from the acid solution to obtain a concentrated sulfuric acid solution with a concentration of 50%.

Embodiment 2

[0037] Vacuumize titanium dioxide waste acid (containing 7.8% ferrous sulfate) with a sulfuric acid concentration of 18.5% at room temperature at 30°C to reduce the pressure to an absolute pressure of 10 Pa for 3 hours to evaporate a large amount of water in the acid solution and ferrous sulfate Gradually crystallize and precipitate, and concentrate the acid solution; separate the ferrous sulfate crystals from the acid solution; age and precipitate the separated acid solution, and separate the heavy metal precipitate from the acid solution to obtain a concentrated sulfuric acid solution with a concentration of 65%.

Embodiment 3

[0039] Vacuumize titanium dioxide waste acid (containing 7.8% ferrous sulfate) with a sulfuric acid concentration of 18.5% at room temperature 20°C to reduce the pressure to an absolute pressure of 100 Pa for 2.5 hours to evaporate a large amount of water in the acid solution, and the sulfuric acid Ferrous crystals are gradually crystallized and the acid solution is concentrated; the ferrous sulfate crystals are separated from the acid solution; after the separated acid solution is aged and precipitated, the heavy metal precipitate is separated from the acid solution to obtain concentrated sulfuric acid with a concentration of 54.8% liquid.

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Abstract

The invention discloses a method for concentrating titanium pigment waste acid, which can be used for preparing sulphuric acid concentrated solution with the concentration of 30-70% and removing a great deal of ferrum and impurities in the waste acid, so that the content of ferrous sulphate can be reduced to be 0.6-0.7%, and the concentrated acid can be directly used for industry. The method comprises the steps: (1) the titanium pigment waste acid liquor with the sulphuric acid concentration of 10-25% is vacuumized at the normal temperature of 10-30 DEG C and decompressed to absolute pressure of 600-5Pa for 2-3h, so that a great deal of moisture in the acid liquor is evaporated, and the ferrous sulphate is gradually crystallized and separated out; (2) the crystalline substance of the ferrous sulphate is separated from the acid liquor, so that the concentrated acid with the concentration of 30-65% is obtained.

Description

technical field [0001] The invention relates to a treatment method for titanium dioxide waste acid, in particular to a method for concentrating and recycling the waste acid produced in the process of producing titanium dioxide by a sulfuric acid method. Background technique [0002] There are two types of titanium dioxide production processes, the sulfate process and the chloride process. The technology of the sulfate process is simpler than the chloride process, and can be used for low-grade and relatively cheap minerals. At present, except for the 15,000 t / a production plant of Jinzhou Titanium Industry Co., Ltd. of Panzhihua Iron and Steel Group, which is produced by the chloride method, the rest of the titanium dioxide production in China is produced by the sulfuric acid method. In the production process of titanium dioxide by sulfuric acid method, for every 1 ton of titanium dioxide produced, high titanium slag is used as raw material, and sulfuric acid consumption is a...

Claims

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Application Information

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IPC IPC(8): C02F9/02C01B17/90C01G49/14B01D9/02C02F1/38
Inventor 肖丹王强郭勇王隽周在德
Owner SICHUAN UNIV
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