Continuous production process for polyaluminium chloride and production equipment

Abstract

The invention discloses a method for continuously producing poly-aluminum chloride and the production equipment thereof. The method comprises the steps of preparing uniform mushy slurry with a solid material and water; inputting the slurry and hydrochloric acid into a reactor for hybrid reaction; maintaining the reaction and a proper reaction temperature during the maturing process by controllingthe heat produced by the reaction itself; maintaining the torrential mixed state of the slurry during the reaction and the maturing processes; and filtering the slurry after the reaction and the maturing processes to obtain liquid poly-aluminum chloride. The equipment comprise a slurry inputting device, a hydrochloric acid inputting device, a reactor, a maturing reactor and a filter; the slurry inputting device and the hydrochloric acid inputting device are respectively connected to the reactor through a metering pump; the output end of the reactor is connected with the maturing reactor; and the output end of the maturing reactor is connected with the filter. All raw materials enter the reactor in liquid form, so that adding materials is safe and convenient, the effect of mixing materialsin the reactor is good, the material and the energy losses during the whole process are small, the temperature is easy to control, the continuous production can be realized, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of production and application of polyaluminum chloride, in particular to a continuous production method of polyaluminum chloride and production equipment thereof. Background technique [0002] Polyaluminum chloride (PAC) is a high-performance inorganic polymer flocculant, which can remove suspended solids, organic matter, heavy metals and radioactive pollutants in water. Due to the characteristics of large molecular structure, strong adsorption force, strong cohesion force, large flocs formed, fast sedimentation, and small dosage, it is widely used in the water treatment industry. [0003] There are many methods for domestic production of PAC, currently mainly acid-soluble method, alkali method, gel method, thermal decomposition method and so on. Commonly used raw materials are: (1) elemental aluminum (aluminum ingot, aluminum ash, aluminum chips and other aluminum processing waste); (2) aluminum-containing...

AI Technical Summary

Problems solved by technology

No matter whether the PAC is produced in an open reaction tank or a kettle reactor, it is inconvenient to add solid raw materials. When the solid raw materials are added, the reaction with the acid is very violent, which may easily cause material spraying and cause safety accidents; In the follow-up process, the reaction product is extracted or placed from the reaction pool or reactor to make aluminum chloride better polymerized (cured), so it occupies a large area, takes a long time, and has low production efficiency; the production process of polyaluminum chloride is liquid , solid two-phase reaction, since the open reaction pool or tank reactor is used, the mixing effect of the reaction system is poor when the industrial scale-up is carried out. With the increase of the reactor volume, the energy consumption of mechanical stirring and the investment cost increase sharply

Moreover, the reaction temperature should be around 90-120°C, so it must be heated by boilers and other equipment during the production process, which not only increases infrastructure facilities, but also consumes a lot of energy. High production cost and low product market competitiveness affect the large-scale industrial production and application of the water purifier

[0005] Numerous documents have also carried out a large amount of reports to polyaluminum chloride production method and technique, but mainly propose new production method for raw material as CN1032150, CN1046512, CN1051541, CN1090555, CN1251824, CN1290656, CN1180661, CN1334241, CN1483675, CN1544348, CN1686813 etc.; To improve the performance of product polyaluminum chloride or improve the stripping rate of aluminum such as CN1205306, CN1381401, CN1718543, CN1865149, CN1948156, CN200978239 etc. for production process, and then lack report for the continuous production process of polyaluminum chloride

Images