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Method for preparing double-acid ferro-aluminum flocculating agent

A bis-acid aluminum iron and flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of secondary pollution, strong corrosion, strong acidity, etc. in water treatment, and achieve strong adaptability, good effect, and low price cheap effect

Inactive Publication Date: 2010-04-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the concentration is greater than a certain concentration for organic wastewater treatment, part of the iron in PFS will form metal organic matter and dissolve in water, causing secondary pollution of water treatment, so it is not suitable for drinking water treatment, and it is highly acidic and corrosive.

Method used

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  • Method for preparing double-acid ferro-aluminum flocculating agent
  • Method for preparing double-acid ferro-aluminum flocculating agent
  • Method for preparing double-acid ferro-aluminum flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare bis-acid aluminum iron flocculant, the steps are as follows:

[0022] 1. Crushing commercially available industrial-grade calcium aluminate and sieving with a 60-mesh sieve, the under-sieve is calcium aluminate powder with a particle size less than 60 mesh, wherein the aluminum content of calcium aluminate is greater than or equal to 50% (mass percentage) ;

[0023] 2. Prepare a hydrochloric acid solution with a volume percentage of 20%, and weigh 20 g of calcium aluminate powder and 80 g of hydrochloric acid in a mass ratio of 4:1 (hydrochloric acid solution: calcium aluminate powder). Mix and stir hydrochloric acid and calcium aluminate powder, react at 98°C for 1 to 1.5 hours, dissolve the aluminum in the calcium aluminate powder, and take the supernatant after standing for 30 minutes to obtain AlCl 3 of liquid.

[0024] 3. In AlCl 3 Add 2g of commercially available industrial-grade ferrous sulfate to the liquid, stir rapidly at 80-90°C, and add 40ml of so...

Embodiment 3

[0032] The coking waste water was treated with the bis-acid aluminum iron flocculant prepared in Example 1, and the experimental water was taken from the biochemical effluent of a coking plant. Compare the bis-acid aluminum iron flocculant of the present invention with other three flocculants, see image 3 shown.

[0033] The water quality of the biochemical effluent of the coking plant is: COD is 200mg / L, suspended matter is 80mg / L, and the chromaticity is 100. Enhanced coagulation is used for advanced treatment, and the dosage of flocculant is 200mg / L, and an additional 1mg is added / L polyacrylamide coagulant. The results are compared as follows:

[0034] The bis-acid aluminum-iron flocculant is better than other flocculants in removing COD, suspended solids and chroma in the biochemical effluent of the coking plant, and the removal rates are about 51% for COD, 85% for SS, and 80% for chroma.

Embodiment 4

[0036] The micro-polluted water was treated with the bis-acid aluminum iron flocculant prepared in Example 1, and the experimental water was taken from the Huangpu River. The bis-acid aluminum iron flocculant prepared by the present invention is compared with other three kinds, see Figure 4 shown.

[0037] The water quality of Huangpu River is: COD Mn It is 6mg / L, and the turbidity is 48mg / L. It is treated with enhanced coagulation, and the dosage of flocculant is 30mg / L. The results are compared as follows:

[0038] COD of Huangpu River Water by Bis-Aluminum-Fe Flocculants Mn , the turbidity removal effect is better than other flocculants, and the removal rate is COD M n62%, turbidity 94%.

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Abstract

The invention discloses a method for preparing a double-acid ferro-aluminum flocculating agent, which relates to a process for preparing the double-acid ferro-aluminum flocculating agent by using calcium aluminate powder. The method comprises the following steps of: taking the calcium aluminate powder of which the particle size is smaller than 60 meshes, putting the calcium aluminate powder into a hydrochloric acid solution in a part mass ratio of the hydrochloric acid solution to the calcium aluminate powder of 3-5:1, reacting the two materials at a temperature of 98 DEG C for 1 to 1.5 hours, standing the mixture for 30 minutes, and then taking a supernatant to obtain AlCl3 liquid; adding ferrous sulfate to the mixture in a part mass ratio of the calcium aluminate powder to the ferrous sulfate of 9-11:1 at a temperature of between 80 and 90 DEG C, dropwise adding a sodium hydroxide solution of which the concentration is 0.5 mol / L into the mixture after 15 minutes, dropping oxyful into the mixture in a part mass ratio of the ferrous sulfate to the oxyful of 1:1-1.5 when the basicity is 30 to 40 percent, stirring the mixture continuously for 15 to 20 minutes, and then curing the mixture at a temperature of between 50 and 60 DEG C for 12 hours to obtain a liquid product of the double-acid ferro-aluminum flocculating agent; and drying the liquid product of the double-acid ferro-aluminum flocculating agent to obtain a double-acid ferro-aluminum solid product. Tests show that in the solid product, Al2O3 is over 30 percent, the total iron is over 1 percent, the insoluble substances is less than 1 percent, and other indexes accord with the national standards. The method has a simple process and a low cost, and the prepared product has a good coagulation effect and high economic and social benefits.

Description

technical field [0001] The invention discloses a method for preparing a bis-acid aluminum-iron flocculant, relating to a method for preparing a bis-acid aluminum-iron flocculant with calcium aluminate powder, and belongs to the technical field of flocculant preparation for water treatment. Background technique [0002] In the treatment of municipal water supply, domestic sewage and industrial wastewater, flocculation technology is one of the most widely used technologies. The flocculant is the key to the flocculation technology. Therefore, actively carry out the research on the flocculant, and develop new flocculants with easy-to-obtain raw materials, simple process, non-toxic (or low-toxicity), cheap and high-efficiency to improve the flocculation efficiency and water purification effect. , reduce the cost of water production, ensure the sustainable use of water resources, and realize the sustainable development of the environment and economy in the 21st century has importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 潘碌亭束玉保吴锦峰
Owner TONGJI UNIV
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