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Method and system for purifying and reducing sulfuric acid process titanium dioxide acidolysis titaniferous solution

A technology of titanium dioxide and sulfuric acid method, which is applied in chemical instruments and methods, titanium compounds, titanium oxide/hydroxide, etc., can solve outstanding cost and environmental problems, consume more cooling and heat, and be difficult to sell in large quantities, etc. problems, to achieve the effect of improving the working environment, shortening the operation time, and reducing labor costs

Pending Publication Date: 2021-10-01
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] According to the data reported by most manufacturers, the average consumption of iron powder per ton of sulfuric acid titanium dioxide is about 155kg. Calculated on the basis of an annual output of 100,000 tons of titanium dioxide, the annual consumption of iron powder needs to be about 15,500 tons, and the cost is about 53 million yuan. Iron powder is finally produced in the form of FeSO4·7H2O and FeSO4·H2O, together with FeSO4·7H2O and FeSO4·H2O produced by the acid hydrolysis of titanium concentrate, the quantity is huge and difficult to sell, and more cooling energy is required in the process of separating FeSO4 and heat, an increasingly thorny issue for manufacturers
Moreover, these newly added iron powders need to consume more sulfuric acid and produce more waste water and waste gas, and the cost and environmental problems are very prominent.

Method used

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  • Method and system for purifying and reducing sulfuric acid process titanium dioxide acidolysis titaniferous solution

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Embodiment 1

[0048] See figure 1 , a system for the purification and reduction method of sulfuric acid titanium dioxide acidolysis titanium solution,

[0049] Including acid solution titanium liquid cooler 1, settling tank 2, mud tank 4, plate and frame filter press 6, dilute titanium liquid storage tank 9, electrolytic tank 14, reduced titanium liquid tank 15 and reduced titanium liquid cooler 17;

[0050] The hot material inlet at the bottom of the acidolysis titanium liquid cooler 1 is connected to the acidolysis tank or the secondary dissolution tank through a pipeline, and the cold material inlet at the upper part of the preheater 1 is connected to the dilute titanium liquid storage tank after the disc filtration of the crystallization-hydrolysis section through a pipeline, The outlet of the cold material at the lower part of the preheater 1 is connected to the feed tank of the tubular filter in the crystallization-hydrolysis section through a pipeline, and the outlet of the hot mater...

Embodiment 2

[0063] The reduction method of embodiment 1, comprises the following steps:

[0064] Step (1): cooling process,

[0065] Pass the acidolysis titanium solution matured in the acidolysis tank or the secondary dissolution tank into the bottom inlet of the acidolysis titanium solution cooler 1, and pass the acidolysis titanium solution cooler 1 upper side inlet into the self-crystallization-hydrolysis section disc after filtration After the indirect heat exchange, the temperature of the dilute titanium solution rises from about 20°C to about 55°C, and then returns to the tubular filter feeding tank of the crystallization-hydrolysis section from the side outlet of the acidolysis titanium solution cooler 1. After the titanium solution is cooled to about 60°C, it comes out from the top of the acidolysis titanium solution cooler 1 and mixes with the flocculant in proportion, and then enters the continuous settling tank (2). The mixing volume ratio of the cooled acidolysis titanium sol...

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Abstract

The invention belongs to the technical field of sulfuric acid process titanium dioxide production, and particularly relates to a method and a system for purifying and reducing a sulfuric acid process titanium dioxide acidolysis titaniferous solution. The system comprises an acidolysis titaniferous solution cooler, a settling tank, a mud tank, a mud plate-and-frame filter press, a dilute titaniferous solution storage tank, a tubular filter, a clear titaniferous solution storage tank, an electrolytic tank, a reduced titaniferous solution tank, a circulating pump, a reduced titaniferous solution cooler, an online analyzer and a control valve. According to the invention, the reduction sequence and the reduction mode of Fe<3+> and Ti<4+> in the titanium solution in the prior art are changed. By adopting the process of firstly exchanging heat and purifying and then performing electrolytic reduction, not only is a large amount of iron powder and sulfuric acid raw materials saved, but also a large amount of cold and heat consumed by separating ferrous sulfate in the subsequent process is greatly reduced, meanwhile, the emission of low-value FeSO4.7H2O and FeSO4.H2O is reduced, the emission of waste gas and waste acid water is greatly reduced, not only is the labor intensity reduced, the labor environment is improved, but also the titanium liquid acidolysis section can achieve reduction automation and precision, and resource-saving and environment-friendly clean production is achieved.

Description

technical field [0001] The invention belongs to the technical field of sulfuric acid titanium dioxide production, and specifically relates to a purification and reduction method and system for sulfuric acid titanium dioxide acidolysis titanium solution. Background technique [0002] At present, the domestic titanium dioxide production technology mainly adopts the sulfuric acid method, and the annual production capacity of the sulfuric acid method has exceeded 3 million tons. Many domestic production devices using this technology have been built and operated. Considering the production cost factor, most manufacturers use titanium concentrate with a TiO2 content of 44% to 50%, of which Fe2O3 and FeO are relatively large, and the titanium liquid contains more Fe2(SO4)3 and FeSO4 after being hydrolyzed by sulfuric acid. , due to the use of compressed air to stir during the acidolysis reaction, FeSO4 is partially oxidized to Fe2(SO4)3 at a higher temperature. If these Fe3+ are no...

Claims

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Application Information

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IPC IPC(8): C01G23/053
CPCC01G23/0532
Inventor 吴震坤
Owner EAST CHINA ENG SCI & TECH