CN105984928A - Method for preparing polysilicate aluminum ferrite - Google Patents

Abstract

The invention provides a method for preparing polysilicate aluminum ferrite. The method includes preparing polysilicic acid from sodium silicate under acidic conditions; sequentially adding aluminum salt and iron salt into the polysilicic acid and polymerizing the aluminum salt, the iron salt and the polysilicic acid to obtain the PSAF (polysilicate aluminum ferrite); adding magnesium sulfate and activated carbon into the PSAF and modifying the PSAF by the aid of the magnesium sulfate and the activated carbon to obtain novel inorganic high-polymer flocculating agents. The sodium silicate is used as a raw material. The magnesium sulfate and the activated carbon are modifying agents. The method has the advantages that processes are simple, the method is low in investment and cost, excellent flocculation effects can be realized by the modified polysilicate ferric flocculating agents prepared by the aid of the method, and the polysilicate ferric flocculating agents are high in floc settling velocity and long in stabilization time; the raw material for the polysilicate aluminum ferrite can come from wide sources, few residues can remain in water treated by the aid of the polysilicate aluminum ferrite, and the like.

Description

A kind of preparation method of polymeric aluminium ferrum silicate

Technical field

The present invention relates to flocculant preparation field, be specifically related to the preparation method of a kind of polymeric aluminium ferrum silicate.

Background technology

Water is one of modal material on the earth, is the valuable source of all life existence including humans, is also The most important part of organism.China is the country that shortage of water resources, a water damage take place frequently, and the gross amount of water resources of China occupies The 6th, the world, but occupancy volume per person only has 2500m3, about the 1/4 of world occupancy volume per person.So-called water pollutes, and is fingering Enter the scope that the exogenous material of water body can bear beyond self-purification of waters, and cause the physical property of water body, chemistry Character, biological or radioactivity etc. change, and make water quality deterioration.At present, the pollutant causing water pollution mainly has life Sewage, industrial wastewater, the farmland sewage containing chemical fertilizer, agricultural chemicals etc. and trade waste, house refuse and mine system engineering etc..According to Report, there are about the industrial wastewater of 1/3 and the sanitary sewage of more than 90% unprocessed is discharged directly into water every year in China Territory, there are about the river of more than 70% and is contaminated, and the urban water resource of more than 90% is polluted.Our underground water and coastal waters water Also being just gradually contaminated, the water resource that can be used reduces.The water pollution problems being on the rise, the serious threat mankind's Living safety.According to authoritative institution's investigation display, in developing country, the disease having 80% is to propagate owing to drinking antihygienic water , at least 20,000,000 people are dead because drinking unhygienic water in the annual whole world.

It is China's problem demanding prompt solution that water pollutes, and dyeing waste water occupies very big proportion, flocculation process in water pollution Being very important step in treatment of dyeing wastewater, the selection of flocculant during being somebody's turn to do is crucial.The research of poly aluminium iron silicate is Through tending to ripe, it has certain effect to treatment of dyeing wastewater.But, poly aluminium iron silicate poor stability, easy autohemagglutination.In order to carry High aluminium silicate polymer iron stability, needs to be modified it, prepares modified polysilicate ferro-aluminum flocculant.

Content of the invention

The invention provides the preparation method of a kind of polymeric aluminium ferrum silicate, modified poly alumina silicate prepared by the inventive method It is good that iron has flocculating effect, and floc settling velocity is fast, and stabilization time is long, the advantage that after process, the residue in water is few, closes simultaneously Become technique simple, cheap.

The technical solution used in the present invention is as follows:

The preparation method of a kind of polymeric aluminium ferrum silicate, it is characterised in that comprise the following steps:

(1) weighing a certain amount of sodium metasilicate to put in reactor, adding water and be allowed to dissolve, being made into molar concentration is 0.4-0.5mol/ The sodium silicate solution of L, with salt acid for adjusting pH value to 4.5-5.5, at room temperature activates 60-80min,

(2) Al is prepared³⁺Concentration is aluminum sulfate solution and the Fe of 1mol/L³⁺Concentration is the liquor ferri trichloridi of 1mol/L, It under quick stirring, in polysilicon acid solution prepared by step (1), is slowly added into appropriate aluminum sulfate solution and tri-chlorination successively Ferrous solution, is stirred continuously and makes it be polymerized 1.5-2.5h, after still aging 20-22h, and i.e. available poly aluminium iron silicate solution, Al/ Fe mol ratio is 1.5:1；

(3) it is that 1:1 weighs solid magnesium sulfate by Mg/Si mol ratio, join the aluminium silicate polymer ferrous solution that step (2) prepares In, it is desirable to Al/Si mol ratio be 1.5:1, Fe/Si mol ratio be 1:1, stirring polymerization 2-2.5h after stand 8-10h, then exist It is added thereto to appropriate active carbon nanoparticles, after stirring polyase 13-4h, stand, 30-40h, i.e. obtain modified polysilicate ferro-aluminum Flocculant, the quality of active carbon nanoparticles is the 10-15% of magnesium sulfate quality.

Beneficial effect

The inventive method prepares polysilicon acid in acid condition with sodium metasilicate for raw material, and aluminium salt, molysite are sequentially added into polysilicon acid Middle polymerization obtains PSAF, adds improved chemical magnesium sulfate, activated carbon to be modified it, obtain novel inorganic in PSAF High polymer coagulant.This method has that technique is simple, the feature of small investment, low cost, prepared modified polysilicate iron flocculation Agent has more preferable flocculating effect, and floc settling velocity is fast, and stabilization time is long, and raw material sources are wide, the residual in water after process The advantages such as thing is few.

Detailed description of the invention

The preparation method of a kind of polymeric aluminium ferrum silicate, comprises the following steps:

(1) weighing a certain amount of sodium metasilicate to put in reactor, adding water and be allowed to dissolve, being made into molar concentration is 0.4-0.5mol/ The sodium silicate solution of L, with salt acid for adjusting pH value to 4.5-5.5, at room temperature activates 60-80min；

(2) Al is prepared³⁺Concentration is aluminum sulfate solution and the Fe of 1mol/L³⁺Concentration is the liquor ferri trichloridi of 1mol/L, It under quick stirring, in polysilicon acid solution prepared by step (1), is slowly added into appropriate aluminum sulfate solution and tri-chlorination successively Ferrous solution, is stirred continuously and makes it be polymerized 1.5-2.5h, after still aging 20-22h, and i.e. available poly aluminium iron silicate solution, Al/ Fe mol ratio is 1.5:1；

(3) it is that 1:1 weighs solid magnesium sulfate by Mg/Si mol ratio, join in the aluminium silicate polymer ferrous solution that step (2) prepares, Require Al/Si mol ratio be 1.5:1, Fe/Si mol ratio be 1:1, stirring polymerization 2-2.5h after stand 8-10h, then to Wherein add appropriate active carbon nanoparticles, after stirring polyase 13-4h, stand, 30-40h, i.e. obtain modified polysilicate ferro-aluminum wadding Solidifying agent, the quality of active carbon nanoparticles is the 10-15% of magnesium sulfate quality.

Take 500mL stimulated dye wastewater, be placed in beaker, add the modified polysilicate ferro-aluminum of the appropriate present invention to flocculate Agent sample, after quick stirring makes it be sufficiently mixed in 1 minute, then low rate mixing 15 minutes, after standing 35 minutes, take liquid level Liquid at lower 2-4 cm, surveys its CODCr and percent of decolourization, and the CODCr clearance of this flocculant stimulated dye wastewater of result can Reaching 96.02%, percent of decolourization is up to 95.6%.

Claims (1)

1. the preparation method of a polymeric aluminium ferrum silicate, it is characterised in that comprise the following steps:

(1) weighing a certain amount of sodium metasilicate to put in reactor, adding water and be allowed to dissolve, being made into molar concentration is 0.4-0.5mol/ The sodium silicate solution of L, with salt acid for adjusting pH value to 4.5-5.5, at room temperature activates 60-80min；

(2) Al is prepared³⁺Concentration is aluminum sulfate solution and the Fe of 1mol/L³⁺Concentration is the liquor ferri trichloridi of 1mol/L, It under quick stirring, in polysilicon acid solution prepared by step (1), is slowly added into appropriate aluminum sulfate solution and tri-chlorination successively Ferrous solution, is stirred continuously and makes it be polymerized 1.5-2.5h, after still aging 20-22h, and i.e. available poly aluminium iron silicate solution, Al/ Fe mol ratio is 1.5:1；

(3) it is that 1:1 weighs solid magnesium sulfate by Mg/Si mol ratio, join the aluminium silicate polymer ferrous solution that step (2) prepares In, it is desirable to Al/Si mol ratio be 1.5:1, Fe/Si mol ratio be 1:1, stirring polymerization 2-2.5h after stand 8-10h, then exist It is added thereto to appropriate active carbon nanoparticles, after stirring polyase 13-4h, stand, 30-40h, i.e. obtain modified polysilicate ferro-aluminum Flocculant, the quality of active carbon nanoparticles is the 10-15% of magnesium sulfate quality.