Method and device for producing concentrated sulfuric acid by recycling waste acid from sulfate process titanium dioxide production

A technology of titanium dioxide waste acid and concentrated sulfuric acid, which is applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc. The effect of low operating energy consumption and large usable amount

Active Publication Date: 2009-09-23
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to SO 3 There is a certain amount of moisture (mainly from the air) in the furnace gas. In the sulfuric acid absorption system, 0.1-0.15 tons of fresh water needs to be added for every 1 ton of 98% sulfuric acid produced in the sulfuric acid absorption system. The consumption of this supplementary water is relatively large.
Moreover, the sulfuric acid production plant will not use dilute waste acid in this system, because when the waste acid enters the absorption tower, the impurities in the waste acid will cause the blockage of the absorption tower, resulting in shutdown

Method used

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  • Method and device for producing concentrated sulfuric acid by recycling waste acid from sulfate process titanium dioxide production

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A set of sulfuric acid plant that produces 20 tons of 98% sulfuric acid per hour used to add 3 tons of fresh water to the sulfuric acid circulation tank 4 per hour. Now, 6 tons of 49% pre-extracted concentrated sulfuric acid from the pre-extracted concentrated acid tank 3 is used instead of supplementary water, and gradually added to the sulfuric acid circulation tank 4 of the sulfuric acid absorption system, and 98% sulfuric acid in the sulfuric acid circulation tank is continuously injected into the sulfuric acid absorption tower 6 to absorb SO 3 , absorbing SO per hour 3 16 tons (equivalent to 20 tons of 98% sulfuric acid), after the acid concentration increases, after being cooled to 65°C by the heat exchanger 5, it returns to the sulfuric acid circulation tank 4 and is diluted by the pre-extracted concentrated sulfuric acid added. Consumption is about 70% when not adding concentrated sulfuric acid in advance, and the adding speed of concentrated sulfuric acid in a...

Embodiment 2

[0031] The same set of sulfuric acid plant producing 20 tons of 98% sulfuric acid per hour as in Example 1 needed to replenish 3 tons of fresh water to the sulfuric acid circulation tank 4 per hour in the past. According to the present invention, 6 tons of 49% concentrated waste acid (this concentrated waste acid can be made by methods such as spray tower concentration, steam concentration, reverse osmosis concentration, etc.) Supplementary water is gradually added to the sulfuric acid circulation tank 4 of the sulfuric acid absorption system. The 98% sulfuric acid in the sulfuric acid circulation tank 4 is continuously pumped into the sulfuric acid absorption tower 6 to absorb SO 3 After the concentrated increase of acid, it is cooled by heat exchanger 5, and gets back to sulfuric acid circulation tank 4, and the concentrated waste acid added is diluted, and the adding speed of concentrated waste acid is as the criterion with the concentration of sulfuric acid in the tank 4 b...

Embodiment 3

[0033] Replace the 3 tons / hour of water that needs to be supplemented with the original 3 tons / hour of water that has been concentrated by the steam concentration system to 73.5% concentration of sulfuric acid titanium dioxide waste acid or the mixed solution of the same concentration obtained by the compounding method, at a rate of 12 tons per hour. Gradually add in the sulfuric acid circulation tank 4 of the sulfuric acid absorption system in the sulfuric acid plant identical with embodiment 1, 98% sulfuric acid in the sulfuric acid circulation tank 4 constantly pushes into the sulfuric acid absorption tower 6 to absorb SO 3 , after the acid concentration increases, it is cooled to about 68°C through the heat exchanger 5 (the amount of cooling water at this time is equivalent to about half of that when the concentrated sulfuric acid is not added in advance), and returns to the sulfuric acid circulation tank 4, and the concentrated waste acid added is Dilution, the adding spee...

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Abstract

The recycling of diluted waste acid produced in the production process of sulfate process titanium dioxide is a bottleneck limiting the development of the sulfate process titanium dioxide. In addition, manufacturers of sulfate process titanium dioxide usually have sulfate acid production devices due to the need of a large amount sulfate acid. The invention relates to a method and a device for producing concentrated sulfuric acid by recycling waste acid from sulfate process titanium dioxide production. The method comprises the following steps: firstly, performing the pre-concentration of the diluted sulfate acid; secondly, removing most impurities carried by the diluted sulfate acid through settlement; and finally, using the sulfate acid subjected to pre-concentration and impurity removal to replace make up water of a sulfate production system, adding the sulfate acid into a sulfate circulating tank of a sulfate acid absorption tower to produce concentrated sulfate acid after sulfate acid absorption tower absorbs sulfur trioxides, and thus recycling the diluted sulfate acid. The method has the advantages of making a plurality of achievements at one time, namely changing pre-concentrated diluted sulfate acid into concentrated sulfate acid without extra energy consumption and equipment addition while reducing the cooling load of sulfate acid flowing out from the tower at the same time.

Description

Technical field [0001] The invention relates to a recycling method of titanium white waste acid produced by sulfuric acid process, in particular to a method for producing concentrated sulfuric acid by dilute waste acid produced by sulfuric acid process titanium dioxide, and also includes a device for producing concentrated sulfuric acid by using the method. Background technique [0002] Titanium dioxide is an important inorganic chemical raw material, which is widely used in the production of coatings, plastics, paper, ink, ceramics, welding electrodes, cosmetics, food and electronic products. In 2006, the world's annual output exceeded 5 million tons. China is a big country in the production and consumption of titanium dioxide, with an annual production and consumption of about 1 million tons. The production technologies of titanium dioxide usually include sulfuric acid method and chlorination method, and the two methods each account for about 50% of the world's production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69C01B17/88
Inventor 周晓葵张杰兰绪军瞿明军唐林龙孙润发
Owner SICHUAN LOMON TITANIUM IND CO LTD
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