Method for preparing polytitanium coagulant and application thereof

Abstract

The invention discloses a method for preparing a polytitanium coagulant and application thereof. The method comprises the following specific steps: (1) uniformly mixing alcohol and an organic chelating agent, and adding organic titanium alkoxide; (2) mixing deionized water, acid and alcohol, adding the mixed liquid into (1), and performing stirring to obtain a mixed solution; and (3) drying the mixed solution in the step (2) to obtain the polytitanium coagulant. The preparation method of the polytitanium coagulant provided by the invention is mild and controllable in process, and the problem that the polytitanium coagulant is difficult to quickly and stably prepare is solved; besides, the polytitanium coagulant obtained by adopting the method has the excellent coagulation performance, canbe applied to removal of turbidity and heavy metals in wastewater, especially low-temperature low-turbidity water, high-salt wastewater, arsenic-containing and antimony-containing wastewater and the like, has low concentration of residual metals after coagulation and mild pH value of effluent, and is beneficial to operation of subsequent treatment units.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for rapidly and stably preparing a polytitanium coagulant and its application. Background technique [0002] Coagulation is the most important and basic process unit in water treatment, which can effectively remove turbidity and organic matter. Commonly used coagulants are mainly simple salts and polymers of iron and aluminum. However, the aluminum coagulant has problems such as small flocs, narrow applicable pH, and health risks in the effluent; while the iron coagulant is corrosive, and the effluent will contain a certain color and odor. In addition, the use of iron-aluminum coagulants will produce a large amount of sludge that is difficult to handle, and the coagulation effect is poor under special conditions such as low temperature and high salt. Therefore, in order to solve the problems existing in traditional coagulants, new alternative coagulants need to...

AI Technical Summary

Problems solved by technology

[0006] However, in the applicant's follow-up research, it was found that there are still many problems in the preparation process of the precursor with titanium tetrachloride, which are mainly reflected in the rapid and stable preparation: 1) Titanium tetrachloride reacts violently as soon as it comes into contact with ethanol, and a large amount of White smoke (hydrogen chloride gas) and release a lot of heat

Once the released hydrogen chloride gas volatilizes into the atmosphere, it will seriously pollute the environment, and because the alcoholysis process is violent and difficult to control, it is impossible to obtain a titanium solution with stable acidity

2) The alcoholysis process in this patented technical scheme will generate high pressure, and the effective volume of the reaction vessel will be very small. In order to ensure the safety of the synthesis process, the volume of the reaction vessel must be large enough and must have high airtightness and anti-corrosion sex

3) In this patent preparation scheme, the mixed solution is dried, and the natural drying time is not only long (15 days), but also the drying process is easily affected by ambient humidity and temperature, with poor repeatability and low success rate. However, if a conventional oven is used to heat and dry It will seriously corrode the instrument, which is not conducive to the quantitative production of polytitanium coagulant, thus limiting the popularization and application of this product

There is no report on the drying of a single titanium coagulant by spray drying technology. It is very potential to use this technology to quickly prepare solid polytitanium coagulant

Based on the current research progress of polytitanium coagulants, it is urgent to develop new methods to overcome the problems of difficult and slow preparation of polytitanium coagulants.

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