CN105036276B - Rapid synthesis technology for poly-ferric sulfate aluminum - Google Patents
Rapid synthesis technology for poly-ferric sulfate aluminum Download PDFInfo
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Abstract
The invention relates to a rapid synthesis technology for poly-ferric sulfate aluminum and belongs to the technical field of water treatment flocculating agents. The rapid synthesis technology is characterized by comprising the specific preparation steps that materials of, by mass, 51.9%-56% of iron vitriol, 1%-5% of dissolvable aluminum hydroxide, 9.3%-9.6% of sulfuric acid and 33.5% of water are added in a reactor; a manganese dioxide catalyst is added in the reactor, and liquid oxygen is sprayed into the reactor at the same time; in the process, the reaction temperature is controlled to range from 45 DEG C to 55 DEG C; hydrolysis and polymerization reactions are automatically carried out while the oxidation reaction is carried out in the reactor, spray drying is carried out on the materials after the reactions are carried out for 30 min-40 min, the poly-ferric sulfate aluminum is obtained, and the manganese dioxide catalyst is recycled. The technology is simple in generation technology, the production period is greatly shortened, the production cost is reduced, harmful residues in the product are eliminated, and the product is nonpoisonous and harmless.
Description
Technical field
The Fast back-projection algorithm technique of polyacrylamide, belongs to water treatment flocculant technical field.
Background technology
PFAS（PFAS）It is in bodied ferric sulfate（PFS）On the basis of grow up, and to combine PFS excellent
A kind of new and effective water treatment agent selected, can be widely used for the coagulating kinetics of all kinds of waste water, water for industrial use and drinking water.
In China, the production of titanium dioxide generally adopts sulfuric acid process, and in its production process, the yield of side-product ferrous sulfate heptahydrate much surpasses
Cross the yield of titanium dioxide itself.Ferrous sulfate and titanium white waste acid are used to synthesize PFAS with easily-dissolvable aluminum hydroxide, and then for giving up
Water process, turns waste into wealth, and is a kind of important channel for comprehensively utilizing titanium white by product product ferrous sulfate heptahydrate.In the synthesis of PFAS
Cheng Zhong, has three reactions while existing as ferrous sulfate heptahydrate switchs to polymer, i.e. oxidation reaction, hydrolysis, polymerization is anti-
Should.Deciding step is played in these three reactions is oxidation reaction, and the reaction is relatively slow, control whole course of reaction.Therefore, plus
The response speed of fast oxidation reaction becomes the key of synthesis technique.
In the traditional handicraft catalyst adopted by polyaluminum sulfate iron process is sodium nitrite or nitric acid, and this class product is
Harmful influence.And also have the hidden danger of remnant nitrite with sodium nitrite as catalyst.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art, there is provided a kind of response time is short, non-hazardous
The Fast back-projection algorithm technique of the polyacrylamide of residual.
The technical solution adopted for the present invention to solve the technical problems is：The Fast back-projection algorithm technique of the polyacrylamide, its
It is characterised by that concrete preparation process is：
1）Ferrous sulfate heptahydrate 51.9% ~ 56% by mass percentage, easily-dissolvable aluminum hydroxide 1% ~ 5%, sulphuric acid 9.3% ~ 9.6%,
Water 33.5% is added to material in reactor；
2）To in reactor add ferrous sulfate heptahydrate quality 0.7 ‰ ~ 1.7 ‰ manganese dioxide as catalyst, and
Liquid oxygen is sprayed to open oxidation reaction in reactor simultaneously, liquid oxygen injection pressure is in 0.23 MPa ~ 0.38MPa；During control
Reaction temperature processed is at 45 DEG C ~ 55 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, reaction will after carrying out 30min ~ 40min
Material carries out spray drying and obtains PFAS, and reclaims manganese dioxide-catalyst.
The present invention by change primary raw material, technological process, controlling reaction temperature, greatly shorten product synthesis when
Between.Improving The Quality of Products is used for Drinking Water.Given up with the titanium dioxide side-product ferrous sulfate heptahydrate of Production By Sulfuric Acid Process, titanium white
Acid, easily-dissolvable aluminum hydroxide are raw material, make oxidant with liquid oxygen, carry out synthesizing polymeric ferric sulfate aluminum by catalyst of manganese dioxide.With
Toward PFAS in the source of aluminum be addition aluminum sulfate, although aluminum sulfate hydrolysis and polyreaction are rapid, itself
It is relatively costly.This technique employs in recent years to come by the easily-dissolvable aluminum hydroxide of Chalco development ＆ production, in bodied ferric sulfate
In the sour environment of aluminum, coordinate the sulfuric acid dosage that somewhat increases, realize quickly be hydrolyzed, polyreaction, reducing life
Accelerate reaction rate while producing cost.
Ferrous sulfate heptahydrate is oxidized to iron sulfate with liquid oxygen under acid condition and catalytic action.Iron sulfate and readily soluble hydrogen
Aluminium oxide Jing is hydrolyzed and polyreaction obtains compound poly-ferric aluminium sulfate russet.Oxidation reaction, hydrolysis, polyreaction
Three reactions are present in a system simultaneously, influence each other, mutually promote.Oxidation reaction is first in three serial reactiones
Step, the reaction are slower, control whole course of reaction.Therefore, we increase duct injection pump control liquid oxygen and spray into pressure and lead to
Cross addition manganese dioxide-catalyst and accelerate the key that the reaction process is the speed-raising of building-up process.And manganese dioxide-catalyst can be returned
Receipts are recycled.Potential pollution will not be caused to product.
Preferably, step 1）Described in ferrous sulfate heptahydrate for Production By Sulfuric Acid Process titanium dioxide side-product.The present invention's
Inventor has found that sulfuric acid dosage increases, and the basicity of product declines, and affects purifying water effect；Sulfuric acid dosage is reduced, the alkali of product
Degree increase, but it is unfavorable for quickly carrying out for oxidation reaction.And in an acidic solution, Fe2+It is the most steady statue of ferrum, and subtracts with pH
Little, its stability strengthens（Refer to its hydrolysis, the tendency of polymerization reduces）；More alkaline（With respect to Fe3+For）In solution, Fe3+It is ferrum
Most steady statue, ferrous iron is easily oxidized into ferric iron, so in order that Fe2+Fe is changed into as early as possible3+, should exist as far as possible
Carry out under high pH.The present inventor thinks that sulfate radical and the optimum mole ratio of total ferrum are 1.25 in the reaction.And because
Raw material sulphuric acid ferrous iron is the side-product using Titanium White Production By Sulfuric Acid Process, and acidity is higher, therefore, the corresponding sulfuric acid dosage that reduces can be with
Reach the optimum mole ratio of sulphuric acid and total ferrum.Ferrous sulfate heptahydrate is controlled in actual production and the mass percent of sulphuric acid exists
51.9% ~ 56% and 9.6% can reach optimal reaction rate and product effect.
Preferably, step 2）Described in manganese dioxide by metering screw conveyer add.It is convenient to add, quickly.
Preferably, step 2）Described in manganese dioxide addition for ferrous sulfate heptahydrate quality 0.9 ‰ ~ 1.2 ‰.Two
Manganese oxide dosage controls one thousandth in material quantity or so.Optimal catalytic efficiency can be reached.
Preferably, step 2）During middle injection liquid oxygen, oxidation reaction start the injection of initial stage liquid oxygen be just pressed in 0.32 MPa ~
0.38MPa, it is 0.23 MPa ~ 0.28MPa that liquid oxygen injection pressure is adjusted after reaction 10min.In initial reaction stage, Fe2+Contain
Amount is relatively higher, and under the efficient catalytic effect of manganese dioxide, the penetrating speed for accelerating liquid oxygen can quickly make Fe2+Oxidation, Fe2 +Content reduce, oxygen demand reduces, but under the catalytic action of manganese dioxide, still keeps higher oxidizing reaction rate.This work
Skill on the premise of ensureing that Product quality and safety is qualified increases oxygen amount using reaction early stage and adds the side of catalyst manganese dioxide
Method, makes Fe2+It is oxidized to Fe3+Speed greatly speed up, the response time also accordingly shortens, hence it is evident that improve production efficiency.
Preferably, step 2）Described in reaction temperature at 50 DEG C.Under room temperature, ferrous sulfate dissolubility is little, and reaction is difficult
OK, substantial amounts of solid-state ferrous sulfate is yet suffered from.When temperature is higher than 80 DEG C, Fe3+Hydrolysis, precipitation are insoluble in Fe (OH) SO of water4
Yellow mercury oxide, and raise with temperature, Precipitation amount increases, and the compound is insoluble in acid solution, and heat stability is also very big.For
The generation of by-product, temperature control is avoided to be advisable at 45 DEG C ~ 55 DEG C；Preferable reaction temperature is at 50 DEG C.
Preferably, the acid-soluble ratio of described easily-dissolvable aluminum hydroxide is more than 94.0%.The acid-soluble ratio of easily-dissolvable aluminum hydroxide requires big
In 99.0%, hydrolysis reaction can be accelerated, the oxidation for adapting to ferrous sulfate liquid oxygen oxidation under manganese dioxide catalytic action is anti-
Answer speed.
The basicity of described PFAS is more than 16.6%.This technique prepares the alkali of PFAS
Degree can be more than 16.6%, and with more preferable flocculating effect, sedimentation is faster.
Fe in described PFAS2+Mass percent be less than 0.1%.Catalyst and liquid oxygen that this technique is adopted
Feed postition can be within the extremely short time by Fe2+Fe is oxidized to more thoroughly3+, Fe in reacted PFAS2+'s
Mass percent will be less than 0.1%.
The proportion of described PFAS is more than 1.46.This technique prepares the proportion of PFAS can be big
It is bigger in 1.46 density, with more preferable flocculating effect.
Compared with prior art, the Fast back-projection algorithm technique of polyacrylamide of the invention is had an advantageous effect in that：This
The compound poly-ferric aluminium sulfate that technique is obtained is a kind of efficient flocculant.Process is simple is generated, the response time is from traditional 17h
30min ~ 40min is foreshortened to, the production cycle is substantially reduced, is reduced production cost, improve quality, increase economic benefit, reduce
Equipment investment.It is easily-dissolvable aluminum hydroxide to change raw material sulphuric acid aluminum, and another reduces production cost, furthermore by catalyst nitrous acid
Sodium is substituted by manganese dioxide, the nitrite remained in eliminating product, and repeatable utilization of manganese dioxide makes production cost again
Once reduce.Make that product is nontoxic, flocculating effect more preferably, with good development prospect.
Specific embodiment
Below by specific embodiment, the present invention will be further described.Wherein embodiment 1 is most preferred embodiment.
Embodiment 1
1）Ferrous sulfate heptahydrate 54% by mass percentage, easily-dissolvable aluminum hydroxide 2.9%, sulphuric acid 9.6%, water 33.5% is by material
It is added in reactor, the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 1.0 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.34MPa, it is 0.25MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 30min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Embodiment 2
1）Ferrous sulfate heptahydrate 56% by mass percentage, easily-dissolvable aluminum hydroxide 1%, sulphuric acid 9.5%, water 33.5% is by material
It is added in reactor, the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 1.2 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.35MPa, it is 0.26MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 48 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 33min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Embodiment 3
1）Ferrous sulfate heptahydrate 51.9% by mass percentage, easily-dissolvable aluminum hydroxide 5%, sulphuric acid 9.6%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 0.9 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.32 MPa, it is 0.28MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 52 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 32min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Embodiment 4
1）Ferrous sulfate heptahydrate 53.2% by mass percentage, easily-dissolvable aluminum hydroxide 4%, sulphuric acid 9.3%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 0.7 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.38MPa, it is 0.23 MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 55 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 36min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Embodiment 5
1）Ferrous sulfate heptahydrate 54% by mass percentage, easily-dissolvable aluminum hydroxide 3.1%, sulphuric acid 9.4%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 93.5%；
2）To in reactor, add the 1.7 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, liquid oxygen charged pressure is in 0.25MPa；During control
Reaction temperature processed is at 45 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 40min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Comparative example 1
1）Ferrous sulfate heptahydrate 54% by mass percentage, material is added by aluminium hydroxide 2.9%, sulphuric acid 9.6%, water 33.5%
Enter in reactor, the acid-soluble ratio of aluminium hydroxide is 72%；
2）To in reactor, add the 1.0 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.34MPa, it is 0.25MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 30min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Comparative example 2
1）Ferrous sulfate heptahydrate 50.6% by mass percentage, easily-dissolvable aluminum hydroxide 2.9%, sulphuric acid 13%, water 33.5% will
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 1.0 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.34MPa, it is 0.25MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 30min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Comparative example 3
1）Ferrous sulfate heptahydrate 54% by mass percentage, easily-dissolvable aluminum hydroxide 2.9%, sulphuric acid 9.6%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）Liquid oxygen is sprayed in reactor and opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.34MPa, it is 0.25MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 30min by reaction
Row spray drying obtains PFAS.
Comparative example 4
1）Ferrous sulfate heptahydrate 54% by mass percentage, easily-dissolvable aluminum hydroxide 2.9%, sulphuric acid 9.6%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 1.0 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.25MPa, it is 0.34MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material enters after carrying out 30min by reaction
Row spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
Comparative example 5
1）Ferrous sulfate heptahydrate 54% by mass percentage, easily-dissolvable aluminum hydroxide 2.9%, sulphuric acid 9.6%, water 33.5% is by thing
Material is added in reactor, and the acid-soluble ratio of easily-dissolvable aluminum hydroxide is 94.5%；
2）To in reactor, add the 1.0 ‰ of ferrous sulfate heptahydrate quality manganese dioxide to make by metering screw conveyer
For catalyst, and while liquid oxygen is sprayed in reactor opens oxidation reaction, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in
0.34MPa, it is 0.25MPa that liquid oxygen injection pressure is adjusted after reaction 10min, during controlling reaction temperature at 50 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, material carries out after carrying out 1h by reaction
Spray drying obtains PFAS, and reclaims manganese dioxide-catalyst.
The performance test results of the PFAS obtained by each embodiment and comparative example are shown in Table 1.
The performance test results of 1 each embodiment of table and comparative example
Can be seen that PFAS is prepared the response time by the present invention from the course of reaction of each embodiment and comparative example
Foreshorten within 30min ~ 40min from 17 more than h needed for traditional handicraft, reaction rate greatly speeds up, and production efficiency is obtained
Essence is improved.Embodiment 1 is compared with comparative example 1 and be can be seen that：Using the low conventional aluminium hydroxide of acid-soluble ratio, cause hydrolysis
Speed cannot with other two reaction speed it is corresponding, although oxidizing reaction rate improve, but occur aluminium hydroxide residual, give birth to
Into PFAS quality it is not enough.Embodiment 1 is compared with comparative example 2 and be can be seen that：In proportioning, sulfuric acid content is excessive,
Inhibit oxidation rate, Fe2+Oxidation is incomplete, causes the proportion and basicity of product to reduce.Embodiment 1 and 3 phase of comparative example
Relatively can be seen that：Substantially, under conditions of no catalyst is present, oxidation reaction is delayed very much for the addition catalytic action of manganese dioxide
Slowly.In 30min internal oxidition reaction process very littles, it is impossible to obtain PFAS.Embodiment 1 and comparative example 4 are compared can be with
Find out：The early stage stage by stage of liquid oxygen, raising pressure are pumped into and can improve oxidation rate to a certain extent.Embodiment 1 and contrast
Example 5 is compared and be can be seen that：The prolongation response time further improves the quality of product, illustrates anti-under this process conditions
Should carry out very thoroughly, the catalysis oxidation efficiency is sufficiently high.Simultaneously from table 1 it can be seen that being combined for present invention production is poly-
Ferric aluminium sulfate is closed, not only efficiency is greatly improved, and product quality is effectively improved.
The PFAS that this technique is obtained has good flocculating effect, with traditional 17h of same molar concentration with
Upper long technique is made comparisons with the PFAS that this technique is obtained, and observes the flocculating effect of PFAS.The turbidity of visual observation water quality to be measured becomes
Change, find to add the sample of PFAS obtained by this technique compared with the sample of PFAS obtained by the long technique for adding same molar concentration
, sedimentation bigger compared with the precipitation flocculus of, generation faster, water sample turbidity it is lower, effect is substantially more preferable.
The above, is only presently preferred embodiments of the present invention, is not the restriction for making other forms to the present invention, is appointed
What those skilled in the art possibly also with the disclosure above technology contents changed or be modified as equivalent variations etc.
Effect embodiment.But it is every without departing from technical solution of the present invention content, according to the technical spirit of the present invention to above example institute
Any simple modification, equivalent variations and the remodeling made, still falls within the protection domain of technical solution of the present invention.
Claims (9)
1. the Fast back-projection algorithm technique of polyacrylamide, it is characterised in that concrete preparation process is：
1）Ferrous sulfate heptahydrate 51.9% ~ 56% by mass percentage, easily-dissolvable aluminum hydroxide 1% ~ 5%, sulphuric acid 9.3% ~ 9.6%, water
33.5% is added to material in reactor；
2）To in reactor add ferrous sulfate heptahydrate quality 0.7 ‰ ~ 1.7 ‰ manganese dioxide as catalyst, and while
Liquid oxygen is sprayed in reactor to open oxidation reaction, liquid oxygen injection pressure is in 0.23 MPa ~ 0.38MPa；During control it is anti-
Temperature is answered at 45 DEG C ~ 55 DEG C；
3）In reactor oxidation reaction it is simultaneously spontaneous be hydrolyzed, polyreaction, reaction carried out material after 30min ~ 40min
Carry out spray drying and obtain PFAS, and reclaim manganese dioxide-catalyst；
The basicity of described PFAS is more than 16.6%.
2. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Step 1）Described in
Ferrous sulfate heptahydrate for Production By Sulfuric Acid Process titanium dioxide side-product.
3. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Step 2）Described in
Manganese dioxide is added by metering screw conveyer.
4. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Step 2）Described in
The addition of manganese dioxide for ferrous sulfate heptahydrate quality 0.9 ‰ ~ 1.2 ‰.
5. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Step 2）Middle injection
During liquid oxygen, oxidation reaction starts the injection of initial stage liquid oxygen and is just pressed in 0.32MPa ~ 0.38MPa, and liquid oxygen spray is adjusted after reaction 10min
Injection pressure is 0.23 MPa ~ 0.28MPa.
6. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Step 2）Described in
Reaction temperature is at 50 DEG C.
7. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Described readily soluble hydrogen
The acid-soluble ratio of aluminium oxide is more than 94.0%.
8. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Described polymerised sulphur
Fe in sour ferrum aluminum2+Mass percent be less than 0.1%.
9. the Fast back-projection algorithm technique of a kind of polyacrylamide according to claim 1, it is characterised in that：Described polymerised sulphur
The proportion of sour ferrum aluminum is more than 1.46.
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