A kind of method that utilizes polyaluminum chloride residue to carry out reproduction

Existing use of bauxite or calcium aluminate powder and acid solution to produce a large amount of residue (viscous) produced after the production of polyaluminum chloride, such as the invention patent application with Chinese publication number 101456576 discloses a polyaluminum chloride The preparation method of aluminum is specifically a method for producing polyaluminum chloride by using waste acid.Put aluminum-containing waste acid or waste acid in the reactor, add waste aluminum or bauxite at the same time, make full use of the heat energy of the exothermic reaction of waste acid and aluminum to preheat, and then supplement heating to a temperature of 95-105°C, keep 3-5 hours to complete the polymerization reaction.Precipitation or filtration for product separation and enrichment.The resulting residue is usually discarded or landfilled.The residue contains undissolved aluminum ions, which cause a lot of loss and waste, and pollute the environment.It is an unresolved problem in the production process of polyaluminum chloride.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for reproducing polyaluminum chloride residues with reasonable method design, which can effectively recover aluminum ions in residues, effectively reduce environmental pollution, and save production costs.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is the method of utilizing polyaluminum chloride residue to reproduce

method, its production method is:

A, the aluminum-containing residue produced after the reaction of alumina rock or calcium aluminate powder and acid solution to produce polyaluminum chloride, prepare the aluminum-containing residue of 500 parts by weight, and prepare the lye of 10°/^32%;

b. Stir the aluminum-containing residue of 500 parts by weight, slowly add the lye while stirring, so that the aluminum-containing residue is completely dissolved in the lye, and when the pH value reaches 9-10, stop Add, and stop stirring, obtain intermediate solution;

c. Pour the intermediate solution into the reaction tank, add aluminum-containing hydrochloric acid into the intermediate solution, stir evenly, make the pH value reach 4-5, and let it stand for 7-8 hours to obtain liquid polyaluminum chloride and complete the reproduction.

The hydrochloric acid concentration of the aluminum-containing hydrochloric acid described in the present invention is 12%, and the aluminum content is 5%.

The lye of the present invention is sodium hydroxide.

In step c of the present invention, adding ferrous sulfate while adding aluminum-containing hydrochloric acid can realize the production of polyaluminum ferric chloride.The amount of ferrous sulfate added depends on the specific situation and demand, and can be obtained through simple calculation according to the specific component content of raw materials and production requirements.