Method for preparing low-residual-aluminum polyaluminum chloride

A polyaluminum chloride, low-residue technology, applied in aluminum chloride, chemical instruments and methods, aluminum halides, etc., to achieve guaranteed flocculation effect, excellent flocculation effect, and reduction of residual aluminum

Active Publication Date: 2016-12-07
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

However, in water with high pH or high alkalinity, the use of polyaluminum chloride as a flocculant causes the residual aluminum in the water to exceed the national standard for drinking water, which is greater than 0.2mg / Kg

Method used

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  • Method for preparing low-residual-aluminum polyaluminum chloride
  • Method for preparing low-residual-aluminum polyaluminum chloride
  • Method for preparing low-residual-aluminum polyaluminum chloride

Examples

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Embodiment 1

[0024] Embodiment 1: the preparation method of the polyaluminum chloride of a kind of low residual aluminum of this example, its steps are:

[0025] Add 5 tons of hydrochloric acid with a concentration of 15% and 570Kg of aluminum hydroxide in the 10000L reactor, which contains Al 2 o 3 % is 64% (m / m), and the moisture content is 5.5%. In the closed reaction kettle, the temperature is slowly raised to 75 0 C, then rapidly cool down to 25 0 C and keep warm for 8 minutes; the second time slowly raise the temperature to 95 0 C, then rapidly cool down to 45 0 C and keep it warm for 8 minutes; slowly raise the temperature to 130 for the third time 0 C and keep warm; the rate of slow heating is 3 0 C / min, the rate of rapid cooling is 30 0 C / min. The reaction was stirred for 3 hours to obtain 2 o 3 6.1% (m / m), aluminum chloride liquid with a basicity of 2%, add 1.1 tons of calcium aluminate powder to the above-mentioned polyaluminum chloride liquid, the Al of the calcium pow...

Embodiment 2

[0031] Embodiment 2: the preparation method of the polyaluminum chloride of a kind of low residual aluminum of this example, its steps are:

[0032]Weigh 100 grams of hydrochloric acid with a concentration of 31%, add 26 grams of aluminum hydroxide, which contains Al 2 o 3 % is 64% (m / m), the water content is 4% (m / m), and the temperature is slowly raised to 75% in a closed reactor in a closed container. 0 C, then rapidly cool down to 25 0 C and keep warm for 8 minutes; the second time slowly raise the temperature to 95 0 C, then rapidly cool down to 45 0 C and keep it warm for 8 minutes; slowly raise the temperature to 130 for the third time 0 C and keep warm; the rate of slow heating is 3 0 C / min, the rate of rapid cooling is 30 0 C / min, stirred and reacted for 2.5 hours to obtain 2 o 3 12.6% (m / m), aluminum chloride liquid with a basicity of 10%, add 42g of calcium aluminate powder to the above polyaluminum chloride liquid, the Al of the calcium powder 2 o 3 % is ...

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Abstract

The invention relates to a method for preparing polyaluminum chloride, in particular to a method for preparing low-residual-aluminum polyaluminum chloride. The method is mainly used for solving the technical problem that in the prior art, when polyaluminum chloride serves as a flocculating agent in water high in pH or alkalinity, residual aluminum in the water exceeds the national drinking water standard, namely the concentration is larger than 0.2 mg/Kg. The method includes the steps that firstly, hydrochloric acid and an aluminum-containing raw material are put in a closed reaction kettle and fully stirred, water, calcium aluminate powder or sodium aluminate is added into polyaluminum chloride liquid in the closed reaction kettle, the mixture is discharged to a stirring tank through filter pressing after reaction is completed, and 50-150 Kg of a sodium dihydrogen phosphate and disodium hydrogen phosphate mixed aqueous solution is added into each ton of the mixture in the stirring tank, wherein the sodium dihydrogen phosphate and disodium hydrogen phosphate mixed aqueous solution comprises, by mass fraction, 20-30% of sodium dihydrogen phosphate, 5-15% of disodium hydrogen phosphate and the balance water; the finished polyaluminum chloride is obtained after stirring.

Description

technical field [0001] The invention relates to a preparation method of polyaluminum chloride, in particular to a preparation method of polyaluminum chloride with low residual aluminum. Background technique [0002] Polyaluminum chloride is the most widely used inorganic flocculant in the flocculation and sedimentation treatment of water supply. The water body with high pH value and high alkalinity, the most common is the reservoir water in autumn, due to the reproduction and decomposition of algae, the pH of the water body and the alkalinity increase, and there are other water systems that often appear in this situation , For example, these problems also exist in some water supply treatments that use Yellow River water as raw water. 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 solution is first added to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52C02F1/00
CPCC01F7/56C02F1/00C02F1/5245
Inventor 黎东华王伟标吴瑛昊吕科何海鸿
Owner 杭州萧山三江净水剂有限公司
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