Method for removing ferrous and other metal salt from titanium white waste acid
A technology of titanium dioxide waste acid and metal salt, applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of equipment and pipeline blockage, low equipment utilization rate, and troublesome operation.
Inactive Publication Date: 2008-04-09
HEFEI TAINUO CHEM TECH
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Problems solved by technology
The disadvantage of this method is that during the concentration process, with the increase of acid concentration, salts, especially ferrous salts, will continue to precipitate, causing serious blockage of equipment and pipelines. In order to ensure normal operation, it is necessary to stop and clean frequently, and the cycle is getting worse. It is getting shorter and shorter, and in the end even the driving time is not as long as the parking cleaning time, the equipment utilization rate is low, the operating cost is high, the labor intensity is high, and the operation is very troublesome
Method used
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Embodiment Construction
[0015] Now take the waste acid reclaimed by diaphragm water washing equipment as an example, and non-limiting examples are described as follows:
[0016] Acid concentration in waste acid 20%, FeSO 4 The content is 9.46%, and the total content of other salts is 1.7%.
[0017] 1. Put the waste acid into the crystallization kettle, adjust the acid concentration to 50-60% with 98% concentrated sulfuric acid, and control the temperature at 50-70°C, let it stand still, let ferrous and other metal salts fully crystallize, and finally filter, separate and remove Salt slag. The content of ferrous salt in the waste acid is reduced to 1.4%, and the total content of other salts is reduced to 0.43%. The filtrate is concentrated so that the acid concentration reaches about 70%, and is returned to the titanium dioxide production workshop.
[0018] 2. Put the waste acid into the crystallization kettle, adjust the acid concentration to 35-45% with 70% concentrated sulfuric acid, and control ...
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The invention relates to a method used for removing ferrite from titanium white waste acid. Original waste acid with a concentration of around 20 percent is processed, and adjustment of acid concentration, static crystal and separation are included. The static crystal has the key points that: when the concentration of the original waste acid is adjusted to 35 percent to 60 percent by oil of vitriol, the original waste acid which accomplishes the static crystal under 50 DEG C to 70 DEG C is separated after a complete crystal, and then waste acid filtrate is sent to be concentrated, and is returned to a titanium white plant to be used for producing titanium white after being concentrated. The method has the effects that the ferrite in the original waste acid is removed more than 85 percent; the concentration of the ferrite is descended from about 10 in the original waste acid to below 1.5 percent; the other salts are removed more than 75 percent, such as Mg, Al, Mn, etc., and the total concentration of the other salts are descended from 2 percent in the original waste acid to 0.5 percent. As most of the other salts such as ferrite are removed, dregs are not needed to be cleaned in the follow-up concentrating process.
Description
1. Technical field [0001] The present invention is a method for recycling industrial waste acid, to be precise, it is a method for removing ferrous and other metal salts in the waste titanium white acid for the production of titanium white by recycling the waste titanium white acid. 2. Background technology [0002] The production of titanium dioxide by the sulfuric acid method first treats the fine titanium ore or high-titanium slag with more than 90% concentrated sulfuric acid, and removes the titanium oxide (TiO2) in the raw material 2 ) into soluble titanyl sulfate (TiOSO 4 ) to achieve separation, and then the TiOSO after purification and concentration 4 Hydrolysis, precipitation of metatitanic acid (TiO 2 ·H 2 O) generate sulfuric acid simultaneously, as shown in the following formula: [0003] TiOSO 4 +2H 2 O→TiO 2 ·H 2 O↓+H 2 SO 4 [0004] Precipitated TiO 2 .H 2 O is used to produce titanium dioxide, and the filtrate is titanium dioxide waste acid. The...
Claims
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IPC IPC(8): C01B17/90
Inventor 郝荣清孙鹏严永清
Owner HEFEI TAINUO CHEM TECH