CN106186232A

CN106186232A - A kind of flocculant and preparation method thereof

Info

Publication number: CN106186232A
Application number: CN201610680678.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Nie Qizhao
Current assignee: Nie Qizhao
Priority date: 2016-08-17
Filing date: 2016-08-17
Publication date: 2016-12-07

Abstract

The invention discloses a kind of flocculant and preparation method thereof, meet following condition: the mass content of aluminium oxide is 8～17%, basicity 1～10, when the aqueous solution that mass concentration is 1% of aluminium polychlorid made by above-mentioned flocculant, pH value is 3～4.When this flocculant uses, producing flco big in flocculation process, sedimentation velocity is fast, and the corrosion to metal position is little, and beneficially water body is clarified rapidly.

Description

A kind of flocculant and preparation method thereof

Technical field

The invention belongs to water-treatment technology field, be specifically related to a kind of flocculant and preparation method thereof.

Background technology

Shifting to China along with global electronic machine product, quasiconductor also accelerates the paces to China's transfer.Partly lead Body market brings various demand and opportunity to China, and a lot of Semiconductor enterprises establish production base in China.Quasiconductor is raw Produce the transfer to China and not only bring economic interests, also bring new environmental problem simultaneously.In semiconductor production process, Typically can produce some waste water and waste gas, the most especially harm with fluoride waste the most serious.

Production process of semiconductor is complicated, and processing step is up to more than 300 steps, uses multiple chemical reagent and special gas simultaneously Body.Main production process includes: Wafer Cleaning, oxygen like diffusion, chemical gaseous phase deposition (CVD), photoetching, remove photoresist, dry etching (DE), wet etching (WE), ion implanting, metallization (sputter coating PVD, electro-coppering), chemically mechanical polishing CMP detection.Its Middle etching procedures etc. use Fluohydric acid., ammonium fluoride and clean with high purity water, here it is the source of fluoride waste.Fluoride waste is to viscous Film, upper respiratory tract, eyes, skin histology have extremely strong destruction.Can be because of larynx and bronchial inflammation, edema, convulsion after suction Contraction and chemical pneumonitis, emphysema and lethal.Poisoning manifestations have burn feeling, cough, pant, laryngitis, breathe hard, have a headache, feel sick and Vomiting.

The processing method of fluoride waste has a lot, as absorption method, freezing method, ion exchange resin method for removing fluor, activated carbon remove Fluorine method, ultrafiltration, electroosmose process, so far seldom popularization and application, main cause cost is high, and fluoride removing rate is low.The most practical removing at present Fluorine method still uses flocculant fluorine removal, the main side using aluminium polychlorid (PAC) the solution flocculation sediment adding dissolving with hydrochloric acid Method, but the method there is also problems, and the flco mainly produced during sedimentation is little, and sedimentation velocity is slow, to metal The problems such as equipment corrosion is serious.

Summary of the invention

The technical problem to be solved is for above-mentioned the deficiencies in the prior art, it is provided that in a kind of flocculation process Generation flco is big, and sedimentation velocity is fast, and the corrosion to metal position is little, flocculant that beneficially water body is clarified rapidly and preparation side thereof Method.

For solving above-mentioned technical problem, the technical solution used in the present invention is, a kind of flocculant, meets following condition: oxygen The mass content changing aluminum is 8～17%, and basicity 1～10, making the mass concentration of aluminium polychlorid when above-mentioned flocculant is 1% Aqueous solution time, its pH value is 3～4.

Further, the raw material including following mass content is prepared from: organic acid 18%-34% or mineral acid 21%-24% or acetic acid 10% and the mixed acid of hydrochloric acid 21% or nitric acid 5% and the mixed acid of phosphatase 11 5% or salt Acid 14% and the mixed acid of nitric acid 10%；And aluminium polychlorid 32～58%, surplus is water, and total amount is 100%.

Further, the one during this organic acid is formic acid, acetic acid or propanoic acid；This mineral acid is nitric acid or phosphoric acid.

Further, meeting following condition: the mass content of aluminium oxide is 10.32%, basicity 9.2% is dense in quality Degree is in the aqueous solution of 1%, and pH value is 3.25.

Further, the raw material including following mass content is prepared from: aluminium polychlorid 35% and mineral acid 24%, remaining Amount is water, and total amount is 100%.

The invention also discloses the preparation method of above-mentioned a kind of flocculant, the method is as follows: weigh above-mentioned each raw material, will Aluminium polychlorid and selected acid are added to the water mixing, stir 30～50min at a temperature of 50～80 DEG C, are down to room temperature i.e. ?.

One flocculant of the present invention and preparation method thereof has the advantage that coagulation performance is good, flco is big, consumption is few, effect Rate is high, it is fast, applied widely to precipitate.Can reduce by 1/3～1/2 than traditional flocculant usage, cost can save more than 40%.

Detailed description of the invention

One flocculant of the present invention, material content in each embodiment the most as shown in table 1, weighs as described in Table 1 each Raw material, is added to the water mixing by aluminium polychlorid and selected acid, stirs 30～50min, fall in 50～80 DEG C of temperature ranges To room temperature and get final product.Result is as shown in table 1:

The each embodiment of table 1 and evaluation experimental (water sampling 100ml)

As shown in table 1, take the pending water sample of many parts of 100ml with the time-division, in pending water sample, i.e. in the former water in table 1 Content of fluoride ion is 1000mg/l, is separately added into 3g calcium hydroxide, then is separately added into corresponding real in corresponding pending water sample Execute the flocculant 1ml in example, be again sufficiently stirred for, after upper strata liquid level is clarified, take supernatant and survey content of fluoride ion, respectively such as table Add after sample in water shown in content of fluoride ion in 1.The addition of calcium hydroxide is big according to the content of fluorion in pending former water Little it is adjusted.Its addition standard is followed: the mol ratio of calcium ion and fluorion at least should be greater than the amount of 1.5:1.

From in table 1, when selecting nitric acid, flocculation rate is the fastest, and effect is best, and the water quality after process is optimum；It is better than passing The effect of flocculant prepared by the selection hydrochloric acid of system.

One flocculant of the present invention, according to rise during fluorine generation aggregation in fluoride waste important cohesion aluminum and Basicity and pH value, it is thus achieved that improve the aluminium salt high efficiency composition flocculant going fluorine ability.Improve fluorine by this composite flocculation agent to coagulate Cumulative power and go fluorine efficiency, by the fluorine generation aggregation of fluoride waste during chemical treatment, is allowed to quickly form condensation product also Quickly precipitate, go fluorine removal by filtration.Sludge creation amount can be reduced to greatest extent, sludge creation can be reduced to greatest extent Amount, can significantly reduce fluoride wastewater treatment expense, reduce the content of fluorion in water to greatest extent, reduce chlorine to greatest extent Ion existence in water, protection water treatment facilities and pipeline are not corroded, and also help giving birth to of follow-up sewage disposal simultaneously The property changed, and make the BOD/COD ratio of follow-up good anaerobic treatment raise, biodegradability strengthens.

Claims

1. a flocculant, it is characterised in that meet following condition: the mass content of aluminium oxide is 8～17%, basicity 1～ 10, when the aqueous solution that mass concentration is 1% of aluminium polychlorid made by above-mentioned flocculant, its pH value is 3～4.

A kind of flocculant the most according to claim 1, it is characterised in that include following mass content raw material preparation and Become: organic acid 18%-34% or mineral acid 21%-24% or acetic acid 10% and the mixed acid of hydrochloric acid 21% or nitre Acid 5% and the mixed acid of phosphatase 11 5% or hydrochloric acid 14% and the mixed acid of nitric acid 10%；

And aluminium polychlorid 32～58%, surplus is water, and total amount is 100%.

A kind of flocculant the most according to claim 2, it is characterised in that described organic acid is in formic acid, acetic acid or propanoic acid One；Described mineral acid is nitric acid or phosphoric acid.

A kind of flocculant the most according to claim 1, it is characterised in that meet following condition: the mass content of aluminium oxide Being 10.32%, basicity 9.2%, in the aqueous solution that mass concentration is 1%, pH value is 3.25.

A kind of flocculant the most according to claim 4, it is characterised in that include following mass content raw material preparation and Become: aluminium polychlorid 35% and mineral acid 24%, surplus is water, and total amount is 100%.

6. the preparation method of a kind of flocculant as according to any one of Claims 1 to 5, it is characterised in that the method is as follows: Weigh above-mentioned each raw material, aluminium polychlorid and selected acid be added to the water mixing, at a temperature of 50～80 DEG C stir 30～ 50min, is down to room temperature and get final product.