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Preparation method and preparation equipment for composite polyiron water purifying agent

A production method and technology of production equipment, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as social hidden dangers, and achieve the effects of high production efficiency, low cost and good water purification effect.

Inactive Publication Date: 2014-10-15
徐锁龙
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  • Claims
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AI Technical Summary

Problems solved by technology

So far, there is no economical and practical method for such a large amount of waste sulfuric acid in China. To solve the problem fundamentally, we can only use the traditional "alkali neutralization" method for harmless treatment, resulting in super A large amount of sludge is sent to the landfill for long-term storage. In addition, a large amount of water-soluble salts (mainly sodium sulfate) is discharged into rivers, rivers, and oceans with the water flow. Taking a titanium dioxide factory in Jiangsu as an example, it is sent to the landfill every day. More than 600 tons of sludge were buried in the site, and more than 2,000 tons of water-soluble salts were discharged into the Yangtze River
[0004] As for the by-product ferrous sulfate, because its output is much higher than the total demand of the society, it has been in a serious state of "increasing storage" for a long time. It is strictly forbidden to discharge this product and send it to landfill. Hidden danger

Method used

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  • Preparation method and preparation equipment for composite polyiron water purifying agent

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Effect test

Embodiment 1

[0027] Embodiment 1: a kind of production method of composite polyiron water purifying agent PFAS-1, concrete steps are as follows:

[0028] a): adding waste sulfuric acid to the reactor;

[0029] b): Slowly add waste sulfuric acid quality 8% hydrogen peroxide (H 2 o 2 ), stirred for 10 minutes until the ferrous ions were completely oxidized, at this time the main component in the solution was H 2 SO 4 and Fe 2 (SO 4 ) 3 ;

[0030] c): Add hot water 2.5 times the mass of waste sulfuric acid to raise the temperature in the reactor to above 60°C, then add CaAl with 16% mass of waste sulfuric acid 2 o 4 , Stir, control the pH value to 2.5, control the reaction temperature at 70-80°C; the chemical reaction formula of the product is: Fe 2 (SO 4 ) 3 +H 2 SO 4 +CaAl 2 o 4 +2H 2 O=[Fe 2 (OH) 2 (SO 4 ) 2 ] m +[Al 2 (OH) 4 SO 4 ] n +CaSO 4 .

[0031] d): isolated product, CaSO 4 Insoluble in water, it settles at the bottom, separates the precipitate, and the ...

Embodiment 2

[0035] Embodiment 2: a kind of production method of composite polyiron water purifying agent PFAS-2, concrete steps are as follows:

[0036] a): first set the quality of the waste sulfuric acid that will be added to the reactor, add the ferrous sulfate of 20% of the waste sulfuric acid quality, then add water with 5 times the quality of ferrous sulfate, stir, and the ferrous sulfate is completely dissolved; finally set the A certain amount of waste sulfuric acid is added to the reactor;

[0037] b): Slowly add waste sulfuric acid quality 12% hydrogen peroxide (H 2 o 2 ), stirred for 15 minutes until the ferrous ions were completely oxidized, at this time the main component in the solution was H 2 SO 4 and Fe 2 (SO 4 ) 3 ;

[0038] c): Add hot water 2.5 times the mass of waste sulfuric acid to raise the temperature in the reactor to 60°C, then add CaAl with 19% mass of waste sulfuric acid 2 o 4 , Stir, control the pH value to 2.5, control the reaction temperature at 70...

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Abstract

The invention belongs to the field of chemical industry, and relates to a preparation method and preparation equipment for a composite polyiron water purifying agent. The preparation method comprises the following steps: adding waste sulfuric acid which is generated during a titanium dioxide preparing process into a reaction still; adding iron sulfate; adding water and carrying out stirring to fully dissolve the iron sulfate; adding hydrogen peroxide until the ferrous iron ions are oxidized fully; adding hot water; adding CaAl2O4 when the temperature rises to 60 DEG C; controlling the pH value at 2-3; separating the product. The preparation equipment comprises the reaction still, a waste sulfuric acid box, a hydrogen peroxide box and a hot water box; a stirring device is arranged in the reaction still; the waste sulfuric acid box, the hydrogen peroxide box and the hot water box are connected to the reaction still through pipelines and control valves respectively; a feeding opening and an air opening are formed in the top of the reaction still; a discharging opening is formed in the bottom of the reaction still; a receiving cylinder is arranged under the discharging opening. The equipment utilizes the waste sulfuric acid which is generated during the titanium dioxide preparing process and the iron sulfate to prepare the compound polyiron water purifying agent; dual benefits are gained.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a production method and production equipment for preparing a composite polyferric water purifying agent by using waste sulfuric acid and ferrous sulfate produced in the production process of titanium dioxide. Background technique [0002] Composite polyferric is another new type of high-efficiency water purifier developed on the basis of domestic water purifier polyferric sulfate (referred to as polyferric sulfate, general code PFS). It is a compound of polyferric sulfate and polyaluminum sulfate, general code name PFAS. Composite polyferric water purifier is also called "polymerized ferric aluminum sulfate". Compared with other inorganic polymer flocculants (such as polyferric, polyaluminum, etc.), composite polyferric water purifier has higher purification ability. And there is no "yellowing" phenomenon; there is no secondary pollution to the water body, it is non-toxic, harmles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 徐锁龙
Owner 徐锁龙
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