Special efficient polyaluminum chloride for printing and dyeing wastewater, and preparation method thereof

A technology for polyaluminum chloride, printing and dyeing wastewater, applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc. The effect of excellent COD removal rate

Active Publication Date: 2015-07-08
杭州萧山三江净水剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a special high-efficiency polyaluminum chloride for printing and dyeing wastewater and its preparation method, which mainly solves the problem of polyaluminum chloride existing in the prior art due to the large amount of dosing and the low removal rate of COD, which limits the polymerization The use of aluminum chloride, some composite polyaluminum chloride has also been used, but there are still technical problems such as low COD removal rate and high cost of use.

Method used

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  • Special efficient polyaluminum chloride for printing and dyeing wastewater, and preparation method thereof
  • Special efficient polyaluminum chloride for printing and dyeing wastewater, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the high-efficiency polyaluminum chloride special for printing and dyeing wastewater of this example, its preparation method is:

[0021] Weigh 100 grams of hydrochloric acid with a concentration of 31%, add 22 grams of aluminum hydroxide, which contains Al 2 o 3 % is 64% (m / m), 100-120 0 C stirred and reacted for 2 hours to obtain 2 o 3 It is 11.5% (m / m) aluminum chloride liquid, add calcium aluminate powder 41 grams in above-mentioned aluminum chloride liquid, the Al of this calcium powder 2 o 3 The % is 50% (m / m), the total calcium is 32% (m / m), the water is 137 grams, and it is kept at 80-120 0 C was reacted for 1 hour to obtain 2 o 3 is 10.1% (m / m); the basicity is 85%; the density is 1.24 g / ml polyaluminum chloride; then add 196 grams of dilute hydrochloric acid to the above polyaluminum chloride liquid, and the concentration of the hydrochloric acid is 7.5% (m / m ), kept at 20-80 0 C was reacted for 1 hour to obtain polyaluminium chloride sp...

Embodiment 2

[0026] Embodiment 2: the high-efficiency polyaluminum chloride special for printing and dyeing wastewater of this example, its preparation method is:

[0027] Weigh 100 grams of electronic by-product hydrochloric acid with a concentration of 15%, and Al in this hydrochloric acid 2 o 3 % is 3%, the total acidity is 15%, heated to 50 0 C, add 16 grams of calcium aluminate powder, the calcium aluminate powder contains Al 2 o 3 % is 50% (m / m), and the total calcium content is 32% (m / m). Stir the reaction for 2 hours to obtain Al-containing 2 o 3 8.4% (m / m), salinity is 70%; polyaluminum chloride liquid with a density of 1.20 g / ml, add 13.5 g of hydrochloric acid to the above liquid, the concentration of the hydrochloric acid is 31%, and it is kept at 20-80 0 C was reacted for 2 hours to obtain 2 o 3 It is 7.5% (m / m); and the salinity is 55%, the density is 1.18 g / ml, and the special polyaluminium chloride for printing and dyeing wastewater.

[0028] The chemical reaction f...

Embodiment 3

[0031] Embodiment 3: the high-efficiency polyaluminum chloride special for printing and dyeing wastewater of this example, its preparation method is:

[0032] Weigh 100 grams of hydrochloric acid with a concentration of 31%, add 22 grams of aluminum hydroxide, which contains Al 2 o 3 % is 64% (m / m), 100-120 0 C stirred and reacted for 2 hours to obtain 2 o 3 It is 11.5% (m / m) aluminum chloride liquid, add calcium aluminate powder 30.5 grams in above-mentioned aluminum chloride liquid, the Al of this calcium powder 2 o 3 % is 50% (m / m), total calcium is 32% (m / m), water is 73 grams, and it is kept at 80-120 0 C was reacted for 1-2 hours to obtain 2 o 3 is 10.5% (m / m); the basicity is 75%; the density is 1.23 g / ml polyaluminum chloride; then add 33 grams of dilute phosphoric acid to the above polyaluminum chloride liquid, the phosphoric acid concentration is 40% (m / m ), kept at 20-80 0 C was reacted for 4 hours to obtain 2 o 3 9.1% (m / m); salinity 45%; density 1.22 g / ...

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Abstract

The invention relates to a wastewater treatment agent, and especially relates to a special efficient polyaluminum chloride for printing and dyeing wastewater, and a preparation method thereof. The technical problems of large dose, low COD removal rate and use restriction of and high use cost of polyaluminum chloride in the prior art and low COD removal rate and high use cost of some composite polyaluminum chloride which are certainly applied are solved in the invention. The preparation method comprises the following steps: adding an aluminum-containing raw material into hydrochloric acid, and stirring for fully reacting to obtain a salt with the basicity of 60-90% and a polyaluminum chloride liquid of aluminum trioxide and with the concentration of 4-16%; and adding enough inorganic acid into the polyaluminum chloride liquid into a stirring tank, and fully reacting to prepare the special efficient polyaluminum chloride for printing and dyeing wastewater.

Description

technical field [0001] The invention relates to a waste water treatment agent, in particular to a special high-efficiency polyaluminum chloride for printing and dyeing waste water and a preparation method thereof. Background technique [0002] In the treatment of printing and dyeing wastewater, coagulation sedimentation is an important unit operation step to remove colloidal suspended impurities, COD, and chroma in wastewater. The effect of coagulation sedimentation determines the final wastewater treatment effect, the cost of wastewater treatment, and the amount of mud produced. At present, most printing and dyeing wastewater treatment enterprises use polyaluminum chloride as a coagulant due to the large amount of sludge generated by adding ferrous sulfate. A Chinese patent discloses a method for preparing polyaluminum chloride with high aluminum content (publication number: CN1718543). The raw materials are aluminum hydroxide and hydrochloric acid. The hydrochloric acid so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 金钢阳何海鸿吴瑛昊吕科王伟标
Owner 杭州萧山三江净水剂有限公司
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