A kind of production method of polyaluminum chloride

Abstract

The invention relates to a production method of polyaluminium chloride, the main features of which are: adding industrial hydrochloric acid into a reaction kettle, adding aluminum ash while stirring, then adding a catalyst, passing steam to raise the temperature for reaction, and the reaction temperature is controlled at 85-95 ℃, reaction time 1-1.5 hours; stop the steam, add calcium aluminate powder into the reaction kettle, control the temperature at 95-115 ℃, react for 1-1.5 hours, control the basicity of the product through the addition of calcium aluminate powder . At the end of the reaction, add a precipitation accelerator, stir and precipitate evenly for 12-14 hours, and then transfer the upper liquid to the finished product tank to obtain a liquid polyaluminum chloride product. The present invention adds a catalyst before the reaction, and adds a precipitation accelerator to accelerate the precipitation at the end of the reaction, which can effectively reduce the water-insoluble matter of the product from more than 1.0% to less than 0.3%, and reduce the precipitation time of the product from the original 5-7 The world is reduced to 12-14 hours, which greatly shortens the settling time, improves production efficiency and reduces production costs.

Description

technical field [0001] The invention relates to a production method of polyaluminum chloride, which belongs to the field of water treatment chemicals. Background technique [0002] In the field of water treatment, water purification by flocculation is one of the oldest solid-liquid separation methods. Due to its wide applicability, simple process, and low treatment cost, flocculation is still widely used in drinking water, domestic sewage and industrial Wastewater treatment. [0003] Polyaluminum chloride (PAC) is an efficient inorganic polymer flocculant in water treatment, and its general chemical formula is [Al 2 (OH) n Cl 6-n ] m , mainly through the mechanism of compression double layer, adsorption electric neutralization, adsorption bridging, sediment net capture, etc., to destabilize, aggregate, flocculate, coagulate, and precipitate fine suspended particles and colloidal particles in water to achieve the purification treatment effect. Polyaluminium chloride has ...

AI Technical Summary

Problems solved by technology

The production cost of aluminum hydroxide and aluminum chloride as raw materials is too high, so at present, aluminum-containing minerals are generally used as raw materials in China to prepare polyaluminum chloride