CN1034922C

CN1034922C - Complex aluminate "PAS" and its production process

Info

Publication number: CN1034922C
Application number: CN94100335A
Authority: CN
Inventors: 陈家盛; 陈基本
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-12
Filing date: 1994-01-12
Publication date: 1997-05-21
Anticipated expiration: 2014-01-12
Also published as: CN1092041A

Abstract

The present invention relates to a complex aluminium salt 'PAS' purifying agent and a production technology thereof. The purifying agent is prepared by that the aluminium sulfate obtained by roastion and acid hydrolysis of bauxite and the active aluminium gel obtained by decomposition of alkali-dissolved bauxite are used as raw materials through hydolytic polmeriztion, slaking, concentration, drying, etc. The present invention has the advantages of simple production technology, low cost, high yield, little use level, good agent effect, low treatment cost, quick floccule formation, strong floccule flocculation and stability, quick precipitation, low remaining turbidity, wide application, high harmful element removing and bacterium killing ratio which reaches more than 98%, high purity and stable quality; the coagulation performance of the present invention is better than that of the previous polyaluminium chloride (PAC).

Description

A kind of production technique of polyaluminum sulfate aluminium water purifying agent

The present invention relates to the production technique of a kind of chemical coagulator (water purification agent), especially a kind of production technique of polyaluminum sulfate aluminium water purifying agent.

Purification of water quality is the required of people's lives water and water of productive use, handles useless (dirt) water of industry, protects biochemical environment, all be unable to do without water purification agent.Coagulating agent such as the traditional product alum of China's life-time service, Tai-Ace S 150, molysite, weak effect, expense is big.Develop the seventies and use aluminium chlorohydroxide efficient water-purifying agent (PAC), most of industrial waste alumina (lime-ash) that adopts is made raw material, and direct and reactant salt gets finished product through clarification filtration, is called " aluminium ash acidolysis single stage method ".Owing to the aluminium ash lacks, can not satisfy the demand of production development in recent years, replace the aluminium ash, decompose bauxitic clay, make aluminum chloride earlier, get aluminium glue with the alkali neutralization with hydrochloric acid so use bauxitic clay instead, synthetic with hydrochloric acid again.This method can not be properly settled because of starting material and production technique, and yield is low, and is wasteful, and the cost height has influenced promoting the use of of polymeric aluminum, also has many places not use efficient water-purifying agent so far.

The object of the present invention is to provide a kind of production technique simple, cost is low, the yield height, comprehensive utilization benefit is good, and the product purity height, the polyaluminium sulfate that coagulation effect is good (PAS), production technique.

" PAS " is the abbreviation of polyaluminium sulfate, and it is the modified product of " PAC " (polymerize aluminum chloride), is a kind of macromolecular complex aluminate, and the characteristic index of polyaluminium sulfate is: (1) basicity: 45-70% (2) component: Al: SO ₄: Cl=1: 0.6-1.0: 0.3-0.75, (3) wherein Cl must not be lower than 0.3 to the ratio of component of Al, can introduce 1-2 negatively charged ion in (4) molecule.Polyaluminium sulfate finished product outward appearance is orange or canescence arborescens amorphous granular body, be placed on slightly moisture absorption in the air, soluble in water, the aqueous solution is slightly acidic, generate aluminium hydroxide during hydrolysis, follow physical and chemical processes such as electrochemistry, cohesion, absorption and precipitation take place, thereby play a part to purify water, so claim water purification agent.

The abundant bauxitic clay resource of technology utilization of the present invention is a main raw material, preparation Tai-Ace S 150 (being called for short AS) is for main body, active aluminium glue are auxiliary agent, in same reactive system, by the hydrolytic polymerization effect, polyaluminium sulfate and the common slaking of polymerize aluminum chloride that produces successively, the modification of deriving forms macromole complexing body aluminium salt, thereby increases molecular weight, improve coagulation performance, introduce 1-3 negatively charged ion simultaneously, make polyaluminium sulfate, structural form and characteristic more adapt to its function.

Fig. 1 is the synoptic diagram of technical process of the present invention.

Below in conjunction with accompanying drawing production technology of the present invention is elaborated.

The molten alum clay of aluminum sulfate, alkali that this polyaluminum sulfate aluminium water purifying agent makes through roasting and acidolysis with bauxite is again through NaHCO₃Decomposing the active aluminium glue that makes is raw material, Add hydrochloric acid, aluminium glue, through hydrolytic polymerization, slaking, concentrate, the operation such as drying Make.

1, the preparation of aluminum sulfate (AS)

Adopt the higher bauxitic clay of grade (to contain Al ₂O ₃＞50%) place reverberatory furnace, through 700-750 ℃ of high-temperature roasting 1.5-2.0h, the activation back is mixed in the interlayer reactor with sulfuric acid reacts 5-6h under 115-120 ℃ of temperature, the pH value of solution that makes=3.0.

2, the preparation of active aluminium glue

A, NS method: in Tai-Ace S 150 clear liquid suction neutralizer, be heated to 6.0-70 ℃, add ammoniacal liquor, regulate pH=7.0-7.5, stir, be heated to and boil 2-3 minute, about postcooling to 80 ℃, filter by header tank.Aluminium glue adds clear water and boils, and filters clean ammoniacal liquor, washing, mensuration Al ₂O ₃Content is standby.

B, with sodium aluminate system aluminium glue: the alumina powder of roasting and soda ash are put and are reacted 2h in the pressure cooker (3-5kg/cm2), discharging, separation residue, filtrate adding NaHCO by 1: 1.7 and add water and mixes ₃Decompose, then active aluminium glue, mother liquor reclaims, and adds soda ash and recycles.

3, preparation polyaluminium sulfate (PAS)

Raw material ratio (weight ratio): Tai-Ace S 150: technical hydrochloric acid: active aluminium glue=500-600: 190-200: 250-300.

To add the water accent from the alum liquor in Tai-Ace S 150 workshop rare is that 10% concentration (refers to sulfur acid aluminium 10% (weight), d=1.105), keep 50-70 ℃ of temperature, progressively adding an amount of active aluminium glue then reacts, to eliminate free acid, treat that the pH value is raised to more than 3.0, the component Al of solution: SO ₄=1: 1, promptly get the polyaluminium sulfate first product.

Keep product temperature, in first product, add excessive aluminium glue again, add hydrochloric acid simultaneously, the polyreaction that under constantly stirring, is hydrolyzed, and note additional aluminium glue and moisture, treat that pH rises to 3.0 after, sample testing, adjustment is left standstill, slaking 12-24h preserves moisture.

Meet the requirements of the polyaluminum sulfate aluminum solutions through the coagulation simultaneous test and carry out concentration and evaporation, proportion is 1.4 o'clock, delivers to the drying machine drying, promptly obtains amorphous granular shape polyaluminium sulfate solid finished product.

4, preparation polyaluminium sulfate (2)

The same method of raw material ratio (1), with hydrochloric acid and aluminium glue in 200: the ratio of 100-150 is carried out neutralization reaction, get polymerize aluminum chloride (PAC) crude product, add in the alum liquor, react under 50-70 ℃ of temperature, remaining active aluminium glue progressively adds does promotor in the solution, treat that pH rises at 3.0 o'clock, surplus glue is added, leave standstill slaking 12-24h.

All the other working method are with (1).

Adopt production technique of the present invention can carry out multinomial comprehensive utilization: (1) uses NaHCO again with soda ash and wrought aluminium soil system sodium aluminate ₃Decomposition makes active aluminium glue, and mother liquor is recyclable; (2) silica sand of telling during system sodium aluminate and Tai-Ace S 150 has certain activity, recyclablely is used to make water glass; (3) with ammoniacal liquor neutralisation of sulphuric acid aluminum aluminium glue, filtrate recovery is used to make ammonium sulfate can make farming fertilizer; (4) washing lotion of Tai-Ace S 150 settling tank can be used as and adds the water use between reacting vehicle.

Polyaluminium sulfate production technique of the present invention is simple, the shortcomings such as impure height, waste of aluminium ash single stage method, aluminium salt gel method have been overcome, the product purity height, cost is low, and yield height, have more remarkable coagulation performance than polymerize aluminum chloride: dosage lacks, drug effect is high, processing costs is low, and flocs unit forms soon, and flocculation is big, stability is strong, precipitation is fast, and the mud compressibility is good, and surplus turbidity is low, adapt to wide, the rate of removing of harmful element and bacterium can reach more than 98% in the water, constant product quality, and long storage is never degenerated.

Embodiment:

Get the Tai-Ace S 150 clear liquid and (contain Al ₂O ₃6%) 500ml places beaker, and heating in water bath to 60 ℃ adds active aluminium glue and (contains Al ₂O ₃15%) 150g, reaction 1h, PH=3.0.Insulation adds water 100ml, hydrochloric acid (30%) 200ml, and active aluminium glue 400g, reaction 2h adds aluminium glue 50g again, insulation slaking 15h.Survey pH=3.5, d=1.2 gets polyaluminium sulfate finished fluid 1100ml.

Claims

1, a kind of production technique of polyaluminum sulfate aluminium water purifying agent is characterized in that, it comprises following operation:

The molten bauxitic clay of Tai-Ace S 150, alkali that makes through roasting and acidolysis with bauxitic clay is again through NaHCO ₃Decomposing the active aluminium glue that makes is raw material, add hydrochloric acid, through hydrolytic polymerization, slaking, concentrate, drying process and make product, used various proportion of raw materials (weight ratio) are in this technology: Tai-Ace S 150: technical hydrochloric acid: active aluminium glue=(500-600): (190-200): (250-300).