High-purity high-basicity nanoscale PACS flocculating agent and preparation method thereof

Abstract

The invention relates to a preparation method of a high-purity high-basicity nanoscale PACS flocculating agent. The method comprises the following steps: (1) generating a first-stage PAC material; (2) generating a second-stage high-purity PAC material; (3) performing primary separation on the materials; (4) performing secondary separation on the materials. The PACS flocculating agent prepared by the preparation method has a nanoscale crystal structural form, and the hydroxyl polymerization degree and basicity are increased remarkably, so that the organic high molecular weight is increased, and a very good water purifying effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of water environmental protection, and relates to a PACS flocculant for water purification, in particular to a high-purity and high-basicity nano-scale PACS flocculant and a preparation method thereof. Background technique [0002] PACS products are high-efficiency composite products that introduce sulfate ions into high-purity polyaluminum chloride. Its existing production method is to heat and pressurize in the reactor, and will contain Al 2 o 3 About 64% of the aluminum hydroxide gel is dissolved in the reaction kettle with hydrochloric acid lower than the aluminum equivalent under the condition of heating and pressure, and the clear and translucent polyaluminum chloride liquid is obtained by one-step synthesis after separation. Its response is: [0003] Al(OH) 3 +HCl→Al(OH) 2 Cl+H 2 o [0004] 2Al(OH) 2 Cl+HCl→Al 2 (OH) 3 Cl 3 +H 2 o [0005] Al 2 (OH) 3 Cl 3 →〔Al 2 (OH) n Cl 6-n 〕 M ...

AI Technical Summary

Problems solved by technology

First of all, due to the different production processes, the actual difference in alkalinity is 15%, and the difference in sulfate is even greater. Because of the method of acid-soluble aluminum hydroxide, the added sulfate not only does not increase the basicity, but is caused by SO 4 The increase of the hydrogen ion concentration in the root will reduce the basicity of the high-purity PAC liquid, so that the degree of alkalization cannot be improved, the molecular weight of the simple hydroxyl aluminum polymer decreases, and the effective hydroxyl degree of aluminum polymerization is not enough in water treatment applications. , affects the electrical neutrality in colloid chemistry, and is not as good as PACV and other products with high salinity in functional bodies such as netting, bridging, and adsorption

For this reason, many domestic factories in SO -4 Joining in to learn Japanese technology, all put SO -4 The root content has been increased to between 2.0% and 3.0%, and the PACS products have been significantly improved, but the improvement of the degree of alkalization is still a research topic

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