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Preparation method of high-stability and polymeric-form polyaluminum chloride

A polyaluminum chloride, high-stability technology, applied in aluminum chloride, chemical instruments and methods, aluminum halides, etc., can solve the problems of difficult quality assurance, low effective concentration, poor stability, etc., and achieve short time-consuming and effective period Prolonged, well-stabilized effect

Active Publication Date: 2020-02-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a method for preparing polyaluminum chloride with high stability and polymorphism, which solves the problems of existing polyaluminum chloride with low effective concentration, many impurities and high content. , and the stability is relatively poor, resulting in problems such as difficult quality assurance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of polyaluminum chloride of high stability polymorphism, adopts following steps:

[0031] 1) Add bauxite to 5mol / L concentrated sulfuric acid, so that the molar ratio of aluminum element to concentrated sulfuric acid in the aluminum-containing material is 1:0.5, heat at 50°C, and dissolve at a stirring speed of 100r / min After 120 minutes, the aluminum-containing solution was obtained, and then the 1mol / L sodium hydroxide solution was heated to 80°C to slightly boil. During the heating process, the aluminum-containing solution was added dropwise to the sodium hydroxide solution. When the temperature of the sodium hydroxide solution was lower than 40 When the temperature of the aluminum-containing solution is controlled at 0.5 ml / min; when the temperature of the sodium hydroxide solution is raised to 40°C to 60°C, the drop rate of the aluminum-containing solution is controlled to be 2ml / min; when the temperature of the sodium hydroxide solution...

Embodiment 2

[0035] A kind of preparation method of polyaluminum chloride of high stability polymorphism, adopts following steps:

[0036] 1) Add clay to 8mol / L concentrated sulfuric acid, so that the molar ratio of aluminum element to concentrated sulfuric acid in the aluminum-containing material is 1:1, heat at 60°C, and dissolve at a stirring speed of 200r / min for 100min Finally, the aluminum-containing solution is obtained, and then the 1.5mol / L potassium hydroxide solution is heated to 80°C for slight boiling. During the heating process, the aluminum-containing solution is added dropwise to the potassium hydroxide solution. When the temperature of the potassium hydroxide solution is lower than 40 When the temperature of the aluminum-containing solution is controlled at 0.5 ml / min; when the temperature of the potassium hydroxide solution is raised to 40°C to 60°C, the drop rate of the aluminum-containing solution is controlled to be 2ml / min; when the temperature of the potassium hydroxi...

Embodiment 3

[0040] A kind of preparation method of polyaluminum chloride of high stability polymorphism, adopts following steps:

[0041] 1) Add aluminum ash to 10mol / L concentrated hydrochloric acid, so that the molar ratio of aluminum element to concentrated hydrochloric acid in the aluminum-containing material is 1:1.2, heat at 70°C, and dissolve at a stirring speed of 250r / min for 80min Finally, the aluminum-containing solution is obtained, and then the 2mol / L calcium hydroxide solution is heated to 80°C for slight boiling. During the heating process, the aluminum-containing solution is added dropwise to the calcium hydroxide solution. When the temperature of the calcium hydroxide solution is lower than 40°C , control the dropping rate of the aluminum-containing solution to 0.5 ml / min; When ℃ ~ 80 ℃, control the dropping rate of the aluminum-containing solution to 8ml / min, so that the molar ratio of the aluminum element in the aluminum-containing solution to the calcium hydroxide solu...

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Abstract

The invention discloses a preparation method of high-stability and polymeric-form polyaluminum chloride. The gel preparation process of polyaluminum chloride is combined with the polymerization reaction of an organic monomer to make aluminum ions react with the organic monomer in order to wrap the aluminum ions and stabilize the point position, so PAC has a good stability, and the aluminum form isnot substantially changed within 2 years, thereby the validity period of the product is prolonged, the product can be stored for 2 years, the treatment effect is stable, and the problem of poor stability of an existing liquid PAC product is solved. The method has the advantages of simple preparation process, easiness in operation, wide sources of raw materials, and mild preparation conditions, and the product has the characteristics of high purity, high Alb content, short reaction time and good treatment effect, and has the advantages of low dosage, high COD and turbidity removal rate, high stability and low residual aluminum content when applied to the treatment process of coal chemical industry wastewater.

Description

technical field [0001] The invention relates to the field of sludge treatment for water supply, in particular to a preparation method of polyaluminum chloride in a high-stable polymorphic state. Background technique [0002] The coagulation method plays an important role in the water treatment process, and it is indispensable in the current urban water and industrial wastewater treatment process. The coagulation process is one of the most commonly used important unit processes. It determines the operating conditions of the subsequent process, the final water quality and cost, and thus becomes an important scientific and technological research and development field of water treatment engineering. The performance of the coagulant largely determines the quality of the water treatment effect, and the coagulant is the core of the coagulation water treatment technology. [0003] Polyaluminum chloride is usually called water purifier or coagulant, it is between AlCl 3 and Al(OH) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52C02F103/34
CPCC01F7/56C02F1/5236C02F2103/34
Inventor 孙永军李登周晟葆孙文全周俊
Owner NANJING UNIV OF TECH
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