CN103157437A - Filter aid and regeneration method thereof - Google Patents

Filter aid and regeneration method thereof Download PDF

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Publication number
CN103157437A
CN103157437A CN2013101179654A CN201310117965A CN103157437A CN 103157437 A CN103157437 A CN 103157437A CN 2013101179654 A CN2013101179654 A CN 2013101179654A CN 201310117965 A CN201310117965 A CN 201310117965A CN 103157437 A CN103157437 A CN 103157437A
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flyash
filter aid
slag
salt
filter
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CN103157437B (en
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温金德
于存贞
王延玲
高飞
李韶辉
徐宏刚
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China Aluminum Shandong Co., Ltd.
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Aluminum Corp of China Ltd
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Abstract

The invention provides a filter aid which comprises coal ash or furnace slag. The coal ash or furnace slag is pretreated, wherein the pretreatment comprises the following steps: performing pickling or alkaline washing on the coal ash or furnace slag, and controlling the acid-base mass percent to be 0.1-0.8 percent; or adding lime, and controlling the lime addition amount to be 0.1-0.5 percent of the weight of the coal ash or furnace slag; or adding salt or base, wherein the addition amount of the salt or base is 0.05-1 percent of the mass of the coal ash or furnace slag; or adding the salt, wherein the addition amount of the salt is 1-10 percent of the mass of the coal ash or furnace slag; and stewing the coal ash or furnace slag in which the salt is added at the temperature of 90-200 DEG C for 1-5 hours under sealing conditions, wherein the salt is heated to generate gas. The filter aid disclosed by the invention takes the coal ash and the furnace slag as raw materials and can be widely applied to the industries of coloring, sugaring, beer, chemical industry and the like.

Description

A kind of filter aid and renovation process thereof
Technical field
The present invention relates to filtration art, particularly a kind of filter aid and renovation process thereof.
Background technology
In bayer process, normal the employing added lime in the thick liquid or milk of lime carries out thick liquid drainage.Sodium aluminate solution and lime reaction generate tricalcium aluminate or calcium aluminosilicate hydrate, have the advantages that hardness is high, particle is large, loose porous, can increase gas porosity and gas permeability that thick liquid filters rear filter cake, reduce filtration resistance, improve the production capacity of filter.
Enhancing along with various countries' protection mineral resources consciousness; now be downward trend with bauxite grade, cause red mud separate and subside system to process load and strengthen, in thick liquid, floating material content increases; crude liquor of sodium aluminate strainability variation has affected the flow that passes through of thick liquid refining step.Strengthened the consumption of milk of lime for the filter pressure of alleviating the liquid filter, caused the milk of lime consumption to increase, and the loss of solution oxide aluminium has increased.Therefore be badly in need of a kind of new type filter aid replace lime breast.
Sugaring, papermaking, beverage, brewage and the industry such as paint in, also be widely used filter aid, filter aid plays very important effect in these industries are filtered, be the emphasis of research always, and constantly be improved.Again due to worldwide shortage of water resources and antipollution requirement, make papermaking, beverage, brewage, many industries such as grease, sugaring, organic solvent, medicine and paint must closed cycle water system.In this case, from the processing load aspect of energy savings, reduction slurry consumption and minimizing draining, most economical way is to use efficient regeneration retention and drainage aid agent.This just need to conscientiously examine choice and application and the regeneration of filter filter aid.
Simultaneously, in known various energy resources, coal resources are the abundantest, but coal-fired solid waste flyash and the slag that produces is also countless.Although since the sixties in 20th century, Chinese scholars and engineers and technicians have carried out a large amount of comprehensive utilization deep processing research to flyash, but investigate the domestic and foreign literature report as can be known, flyash but mainly concentrates on the cement manufacturing, builds, builds dam, concrete mixture, the aspect such as materials for wall (brick, watt, plate, piece).In other words, be all it to be carried out the utilization research of low value as trade waste, research and develop utilization and seldom it is applied to other field as resource, especially domestic all the more so.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of filter aid, has solved the problem that level is low, utilization ratio is not high of utilizing that the solid waste coal powder of coal-fired generation and slag exist.
For solving the problems of the technologies described above, the invention provides a kind of filter aid, comprise flyash or slag, the described flyash of pretreatment or slag, described pretreatment comprises:
Described flyash or slag are carried out pickling or alkali cleaning, control simultaneously soda acid mass percent concentration 0.1%~0.8%;
Perhaps add lime, controlling simultaneously described liming amount is 0.1%~0.5% of described flyash or slag weight;
Perhaps add salt or alkali, the addition of described salt or alkali is 0.05~1% of described flyash or slag quality;
Perhaps add salt, the addition of described salt is 1%~10% of described flyash or slag quality, will add the flyash of described salt or slag in 90~200 ℃ of boiling 1~5h under air-proof condition, and wherein, described salt heating can produce gas.
Further, if with described flyash and slag dry powder blend, the mixed proportion of described flyash and slag dry powder is 1: 1~1: 5.。
Further, described flyash or the slag percentage composition in described filter aid is 90% to 99.9%.
In order to address the above problem, the present invention also provides the renovation process of filter aid, and described renovation process comprises:
Control used described filter aid at 120~200 ℃ of drying 1~5h;
Perhaps control used described filter aid and calcine 2~5h under 200~500 ℃;
Perhaps with used described filter aid and 80~200 ℃ of boiling 1~5h of carbon dioxide G﹠W;
Perhaps used described filter aid and carbonate, bicarbonate and 80~200 ℃ of boiling 1~5h of water;
Perhaps with the strong oxidizer aqueous solution of used described filter aid and mass percent concentration 0.2~1.5%, as aqueous sodium hypochlorite solution, hydrogen peroxide etc., soak 1~5h under room temperature.
Filter aid provided by the invention, take flyash and slag as raw material, because flyash and slag specific area are larger, add and also have certain active group, thereby have simultaneously very large physical absorption ability and certain chemisorbed performance, can be widely used in coloured, sugaring, beer, chemical industry and other industries, not only cheap, satisfying the wilderness demand of industrial filter, and realized recycling and reused, is a kind of filter aid of green.The research and development application of this filter aid has realized the value added applications of solid waste.
The specific embodiment
In order to improve the added value of flyash and slag, enlarge the application of flyash and slag, filter aid provided by the invention, take flyash or slag as raw material, and flyash or slag are carried out pretreatment, this pretreatment comprises: flyash or slag are carried out pickling or alkali cleaning, control simultaneously soda acid mass percent concentration 0.1%~0.8%; Perhaps add lime, controlling simultaneously the liming amount is 0.1%~0.5% of flyash or slag weight; Perhaps add salt or alkali, the addition of salt or alkali is 0.05~1% of flyash or slag quality; Perhaps add the salt that heating can produce gas, as ammonium carbonate, carbonic hydroammonium etc., the described addition that can produce the salt of gas is 1%~10% of described flyash or slag quality, and under air-proof condition, flyash or the slag that has added salt is heated 1~5h in 90~200 ℃.If with the dry powder blend of described flyash and slag, the mixed proportion of flyash and slag dry powder is 1: 1~1: 5.In addition, flyash or the slag percentage composition in filter aid is 90% to 99.9%.The specific field of using according to filter aid simultaneously, comprise the technical finesses such as grading, activity excitation, purification or surface treatment, can should be in sugar manufacturing industry, beer industry, chemical industry and other industries with the flyash new type filter aid, and be widely used in alumina producing Bayer process industry.
In the process of using filter aid provided by the invention, the filter aid of finding to make of flyash and slag is after use, great changes will take place for the material composition of itself, just adsorbed Cucumber, if as waste discharge, not only very unfortunate, and cause product cost to improve and secondary pollution, therefore the present invention also provides the renovation process of this filter aid, and this renovation process comprises: control used filter aid at 150~200 ℃ of drying 1~5h; Perhaps control used filter aid and calcine 2~5h under 200~500 ℃; Perhaps used described filter aid and carbonate, bicarbonate and 80~200 ℃ of boiling 1~5h of water; Perhaps with the strong oxidizer aqueous solution of used described filter aid and mass percent concentration 0.2~1.5%, as clorox, hydrogen peroxide etc., soak 1~5h under room temperature.
Example one
Produce the filter aid that is used for the beer drainage that the embodiment of the present invention provides:
Powdered coal ash becomes the semi-finished product of 2~40 μ m through magnetic separation removal of impurities, grinding.Solid-to-liquid ratio 1: 10, sour mass percent concentration was 0.6%, 120 ℃ of temperature, and 1.2 atmospheric pressure of pressure under the condition of time 60min, use hydrochloric acid solution that semi-finished product are dissolved, filter; Use afterwards pure water (distilled water, deionized water etc.) rinsing, perhaps carry out rinsing with beer solution.Flyash after dehydration and rinsing is placed under 110 ℃ and dries to constant weight, and obtains filter aid provided by the invention, i.e. the flyash filter aid.
The flyash that purification processes is clean carries out classification to be processed, and in the level grain, the particulate of 2~20um accounts for 80%, filters beer per ton and consumes 0.77~1.0 kilogram of batching of flyash filter aid.
The regenerative process of filter aid: the renovation process that adopts filter aid provided by the invention, with the aqueous sodium hypochlorite solution 250ml of 1.2% and 0.6% concentration (contain NaOH approximately 1%) with have stench and mix with the flyash filter aid 100g that crosses, stir 1.5h with agitator under room temperature, add again the approximately water soaking of one times of reactant volume, clear liquid is removed in standing 1h hypsokinesis, filtration washing flyash, 200 ℃ of bake dryings are to constant weight, the filter aid after being regenerated (i.e. sample in table 11 and sample 2).The equal odorless of regeneration filter aid flyash sample after treated oven dry.
The filter aid of regeneration is not tested with regeneration filter aid performance comparison: after measured, the various physical properties of filter aid after the regeneration all filter aid (being new coal powder) with not regeneration are suitable, some indexs even surpass new flyash, illustrate that flyash all decomposes adsorbate and absorbs after above-mentioned processing, recovered activity, new flyash filter aid and regeneration flyash filter aid filter-aid performance specific targets see Table 1:
Table 1
Upper table presentation of results, after adding filter aid provided by the invention, actual filtering velocity enlarges markedly, and has improved nearly one times; Be no matter the flyash after new flyash or regeneration, can significantly improve the strainability of beer mother liquor; Under clorox 1.2% and 0.6% concentration, the indices majority of the sample 1 after regeneration and 2 activity is better.Wherein the clorox of 0.6% concentration is due in the situation that relatively less with chemical agent, regeneration activity is relatively especially good, as can be known, with 0.6% clorox (its density is bordering on 1) be that under 2.5: 1 conditions, regeneration flyash effect is better with the flyash weight of material ratio of crossing.
Example two
Produce the filter aid that the embodiment of the present invention is provided for the beer drainage:
Powdered coal ash becomes the semi-finished product of 2~40 μ m through magnetic separation removal of impurities, grinding.Solid-to-liquid ratio 1: 10, sour mass percent concentration was 0.6%, 120 ℃ of temperature, and 1.2 atmospheric pressure of pressure under the condition of time 60m i n, use hydrochloric acid solution that semi-finished product are dissolved, filter; Use afterwards pure water (distilled water, deionized water etc.) rinsing, perhaps carry out rinsing with beer solution.Flyash after dehydration and rinsing is placed under 110 ℃ and dries to constant weight, and obtains filter aid provided by the invention, i.e. the flyash filter aid.
The flyash that purification processes is clean carries out classification to be processed, and in the level grain, the particulate of 2~20um accounts for 80%, filters beer per ton and consumes 0.77~1.0 kilogram of batching of flyash filter aid.
The regenerative process of filter aid: with the flyash that unloads on Buchner funnel, adopt the renovation process of filter aid provided by the invention, first washing, pickling again (sour mass percent concentration is 0.3%), alkali cleaning (the alkali mass percent concentration is 0.4%), wash away and be embedded in protein and the yeast cells that the difficult quilt between flyash water-washes away, then in baking oven 200 ℃ of bake dryings to constant weight.The flyash that regeneration activating is complete and unworn fresh coal fly ash are made comparisons from outward appearance and physicochemical properties aspects, and result shows: flyash color and the outward appearance of new flyash and activation approach, all free from extraneous odour; The flyash housing that this group of microscopy has activated is clear, without bacterium, yeast cells and protein cold sludge.
The filter aid of regeneration is not tested with regeneration filter aid performance comparison: the flyash after this activation is used for filtration experiment, and effect is more satisfactory, can reach the requirement of beer filtering-aid agent; The new filter aid of flyash, flyash regeneration filter aid filtered beer, the variation of wine liquid quality index sees Table 2:
Table 2
As shown in Table 2, after adding flyash filter aid and regeneration flyash filter aid, filter front and back beer physical and chemical index without marked change, and beer turbidity reaches the filtration requirement lower than 0.5EBC.
Example three
Produce the filter aid that the embodiment of the present invention is used for the citric acid fermentation broth drainage
Powdered coal ash becomes the semi-finished product of 40 μ m through magnetic separation removal of impurities, grinding.Solid-to-liquid ratio 1: 10, sour mass percent concentration was 0.6%, 120 ℃ of temperature, and 1.2 atmospheric pressure of pressure under the condition of time 60min, use hydrochloric acid solution that semi-finished product are dissolved, filter; Use afterwards pure water (distilled water, deionized water etc.) rinsing, perhaps carry out rinsing with citric acid solution.Flyash after dehydration and rinsing is placed under 110 ℃ and dries to constant weight, and obtains filter aid provided by the invention, i.e. the flyash filter aid.
The regenerative process of filter aid: the renovation process that adopts filter aid provided by the invention, used flyash filter aid is calcined 2-5h under 450 ℃, and with 120 ℃ of boiling 2h of ammonium carbonate solution of calcined material and mass percent concentration 5%, dry to constant weight under 110 ℃ of filter cakes after filtering means dehydration, obtain regeneration filter aid provided by the invention, i.e. flyash regeneration filter aid.
In 3 Buchner funnels, pad respectively upper two layers of filter paper; And do not lay respectively (1#) on the filter paper of three funnels, lay filter aid (being new flyash) that approximately 1mm is thick (2#), lay the thick regeneration filter aid (3#) of 1mm, then suction filtration is taken from the citric acid fermentation broth of the citric acid content 12% of certain factory.Wherein, regeneration flyash is that after filtering citric acid, the flyash that obtains is processed in regeneration.Drainage effect such as following table 3:
Table 3
As can be seen from Table 3, after adding a little flyash filter aid, filtering velocity significantly improves, and the flyash drainage speed of regeneration is better.Simultaneously, as can be seen from Table 4, after adding the flyash filter aid, the filtrate when not adding filter aid is carried out impurity analysis, adds the filtrate after filter aid, and impurity content obviously descends, and colourity also shoals, and regeneration flyash better effects if, and table 4 is as follows:
Table 4
Example four
Produce the filter aid that the embodiment of the present invention is used for the thick liquid drainage of aluminium oxide Bayer process
Powdered coal ash is got the upper semi-finished product that partly namely obtain greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.Be that 0.1% ammonia spirit (ammoniacal liquor is weak base) mixes with the semi-finished product of 45 μ m and mass percent concentration, make that admittedly to contain be 60% coal ash pulp, under condition of normal pressure, in 90 ℃ of immersion 2h, the filter cake after filtration is placed in 110 ℃, baking oven and dries to constant weight, and obtains filter aid provided by the invention.
The regenerative process of filter aid: with used flyash filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
With the former coal ash pulp of certain density power plant (being filter aid), regeneration coal ash pulp (filter aid of namely regenerating) respectively takes appropriate, join in the thick liquid of 1000ml Bayer and reacted 60 minutes, investigate its filter-aid performance and filtrate component, control 99.5 ℃ of temperature, stir 300r/m.The drainage effect is as follows:
Table 5
Known by table 5, after adding a little flyash filter aid slurry, the thick liquid filtering velocity of Bayer significantly improves, and the flyash drainage speed of regeneration is better, compares with original production milk of lime used, and difference is little.As shown in Table 6, add certain density coal ash pulp and regeneration coal ash pulp, before and after drainage, the variation of solution composition is little; Compare Al with milk of lime with original production 2O 3, SiO 2Concentration and α k have no significant change.
Table 6
Example five
Produce the filter aid that the embodiment of the present invention is used for the thick liquid drainage of aluminium oxide Bayer process
Powdered coal ash is got the upper semi-finished product that partly namely obtain greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.To greater than the semi-finished product of 45 μ m and for the ammonium carbonate of flyash quality 1% (ammonium carbonate is ammonium salt) mixes, obtain filter aid provided by the invention.
The regenerative process of filter aid: with used flyash filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
With fly ash in electric power plant (being filter aid), regeneration flyash (filter aid of namely regenerating), respectively take in right amount, join in the thick liquid of 1000ml Bayer and reacted 60 minutes, investigate its filter-aid performance and filtrate component, and control 99.5 ℃ of temperature, stir 300r/m.Drainage effect such as following table 7:
Table 7
Known by table 7, after adding a little flyash filter aid powder, the thick liquid filtering velocity of Bayer significantly improves.The fine coal ashes drainage speed of regeneration is better, but compares with milk of lime with original production, and is slightly slow.Known by table 8, add a certain amount of flyash solid and regeneration flyash solid, before and after drainage, the variation of solution composition is little. compare Al with the milk of lime drainage 2O 3, SiO 2Concentration and α kHave no significant change:
Table 8
Example six
Produce the filter aid that the embodiment of the present invention is used for the thick liquid drainage of aluminium oxide Bayer process
Powdered coal ash is got the upper semi-finished product that partly namely obtain greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.To mix with the NaOH that accounts for flyash quality 0.08% greater than the flyash semi-finished product of 45 μ m, namely obtain filter aid provided by the invention.
The regenerative process of filter aid: with used flyash filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
With fly ash in electric power plant (being filter aid), regeneration flyash (filter aid of namely regenerating), respectively take in right amount, join in the thick liquid of 1000ml Bayer and reacted 60 minutes, investigate its filter-aid performance and filtrate component, and control 99.5 ℃ of temperature, stir 300r/m.Drainage effect such as following table 9:
Table 9
Known by table 9, after adding 0.08% NaOH in flyash, the thick liquid filtering velocity of Bayer significantly improves.The fine coal ashes drainage speed of regeneration is better, but compares with milk of lime with original production, and is slightly slow.Known by table 10, add NaOH the flyash solid of making and the flyash solid of regenerating of flyash quality 0.08%, before and after drainage, the variation of solution composition is little.Compare Al with the milk of lime drainage 2O 3, SiO 2Concentration and α kHave no significant change:
Table 10
Index batch Na2OT AL2O3 Na2OC SiO2 αk A/S
Thick liquid 180.48 172.80 42.69 1.00 1.32 172.80
Former coal ash 0.6g 179.48 172.80 39.86 1.05 1.33 165.0
Former coal ash 0.75g 178.47 172.20 42.46 1.00 1.30 172.20
Former coal ash 0.9g 177.42 172.20 37.27 1.05 1.34 164.0
Former coal ash 1.2g 181.40 174.90 37.97 1.06 1.35 165.00
Milk of lime 178.92 175.20 43.16 1.04 1.32 168.5
Regeneration coal ash 0.6g 180.45 173.60 40.81 1.03 1.32 168.5
Regeneration coal ash 0.75g 179.82 172.90 41.48 1.02 1.34 169.5
Regeneration coal ash 0.9g 178.38 173.82 40.86 1.02 1.32 170.4
Regeneration coal ash 1.2g 180.58 174.93 39.89 1.02 1.30 171.5
Example seven
Flyash and raw slag are got upper flyash and the slag semi-finished product that partly namely obtain greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.To mix with 1: 1.5 mass percent greater than the flyash more than 45 μ m and slag, namely obtain filter aid provided by the invention.
The regenerative process of filter aid: with used flyash and slag filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
With fly ash in electric power plant and slag solid (being filter aid), regeneration flyash and slag solid (filter aid of namely regenerating), respectively take in right amount, join in the thick liquid of 3000ml Bayer and reacted 60 minutes, measure its floating material, control 99.5 ℃ of temperature, stir 300r/m.It is as shown in the table for result of the test shown in table 11:
Table 11
Through the test of tens groups, as can be seen from Table 11, flyash, the former powder of slag and regeneration powdered coal ash-cinder filter aid removal of impurities floating material are respond well, and after adding the powdered coal ash-cinder filter aid, the floating material of seminal fluid can reach below 0.02g/L.
Example eight
Powdered coal ash is got the upper semi-finished product that partly namely obtain greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.To be that 1% ammonium carbonate, ammonium bicarbonate aqueous solution mix greater than the semi-finished product of 45 μ m and mass percent concentration, make that admittedly to contain be 60% coal ash pulp, under air-proof condition, in 120 ℃ of boiling 2h, the filter cake after filtration is placed in 110 ℃, baking oven and dries to constant weight, and obtains filter aid provided by the invention.
The regenerative process of filter aid: with used flyash filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
To make greater than the fly ash in electric power plant of 45 μ m and lime and certain densityly mix slurry (flyash mixes with milk of lime, i.e. filter aid; When lime and fine coal ashing slurry, the liming amount be flyash weight 0.35%), regeneration flyash mixes slurry, and (regeneration flyash mixes with water, the filter aid of namely regenerating), respectively take in right amount, join in the thick liquid of 1000ml Bayer and reacted 60 minutes, investigate its filter-aid performance and filtrate component, control 99.5 ℃ of temperature, stir 300r/m.Drainage effect such as following table 12:
Table 12
Project Blank reference example The reclaimed coal mortar The reclaimed coal mortar Milk of lime The mixed slurry of former coal stone The mixed slurry of former coal stone
The slurry dosage 0 2ml 2.5ml 3.5ml 2ml 3.5ml
The drainage time 15 minutes 3 seconds 1 minute 35 seconds 1 minute 34 seconds 1 minute 43 seconds 1 minute 49 seconds 1 minute 46 seconds
As shown in Table 12, flyash is allocated the lime drainage into, and thick liquid filtration time is very near the carbonate-free lime breast; Regeneration coal ash pulp drainage time average newborn fast 8 to 10 seconds than carbonate-free lime, even not bad than carbonate-free lime breast drainage effect.Known by table 13, add a certain amount of former fly ash-lime and mix slurry and regeneration flyash mixing slurry, before and after drainage, the variation of solution composition is little. compare Al with the milk of lime drainage 2O 3, SiO 2Concentration and α kHave no significant change, table 13 is as follows:
Table 13
Index batch Na 2O T Al 2O 3 Na 2O C SiO 2 α k A/S
Thick liquid 179.89 174.00 40.57 0.95 1.32 183
Regeneration coal ash pulp 2ml 180.40 172.05 43.40 0.96 1.33 179
Reclaimed coal mortar 2.5ml 180.39 171.70 41.04 0.95 1.34 180
Milk of lime 182.17 170.25 45.52 1.00 1.32 170
The mixed slurry of former coal stone 2ml 185.39 170.70 39.15 0.98 1.41 174
The mixed slurry of former coal stone 2.5ml 182.40 170.52 39.32 0.96 1.12 177
Example nine
Flyash and raw slag are got upper flyash and the slag semi-finished product that partly namely obtain respectively greater than 45 μ m of sieve through 325 order vibratory sieve granularity classifications.To mix with 1: 1.5 mass percent greater than flyash and the slag of 45 μ m, and add 1% carbonic hydroammonium of flyash and slag total weight of solids and 1% ammonium carbonate, allocate again the lime that accounts for flyash, slag, ammonium salt mixture gross weight 0.2% into, mix and namely obtain filter aid provided by the invention.
The regenerative process of filter aid: with used flyash, slag, ammonium salt and lime mixing filter aid, adopt renovation process provided by the invention, be made into water that admittedly to contain be 60% coal-water mixture, and add flyash quality than 3%~5% carbonic hydroammonium, in closed container, in 120 ℃ of boiling 2h, filter the filter cake obtain in baking oven 150 ℃ dry to constant weight, namely get regeneration flyash filter aid.
Certain density fly ash in electric power plant, slag, ammonium salt and lime are mixed slurry, and the regeneration coal ash pulp respectively takes in right amount, joins in the thick liquid of 3000ml and reacts 60 minutes, measures its floating material, controls 99.5 ℃ of temperature, stirs 300r/m.Result of the test is as shown in table 14:
Table 14
Through the test of tens groups, as can be seen from Table 14, the former powder lime of flyash mixes slurry and regeneration coal ash pulp removal of impurities floating material is respond well, and after adding both filter aid, the floating material of seminal fluid can reach below 0.02g/L.
That filter aid provided by the invention can be widely used in is coloured, in sugaring, beer, chemical industry and other industries, not only cheap, satisfy the wilderness demand of industrial filter, and realized that recirculation reuses, be a kind of filter aid of green.The research and development application of this filter aid has realized the value added applications of solid waste.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (4)

1. a filter aid, comprise flyash or slag, and the described flyash of pretreatment or slag is characterized in that, described pretreatment comprises:
Described flyash or slag are carried out pickling or alkali cleaning, control simultaneously soda acid mass percent concentration 0.1%~0.8%;
Perhaps add lime, controlling simultaneously described liming amount is 0.1%~0.5% of described flyash or slag weight;
Perhaps add salt or alkali, the addition of described salt or alkali is 0.05~1% of described flyash or slag quality;
Perhaps add salt, the addition of described salt is 1%~10% of described flyash or slag quality, will add the flyash of described salt or slag in 90~200 ℃ of boiling 1~5h under air-proof condition, and wherein, described salt heating can produce gas.
2. filter aid as claimed in claim 1, is characterized in that, if with the dry powder blend of described flyash and slag, the mixed proportion of the dry powder of described flyash and slag is 1: 1~1: 5.
3. filter aid as claimed in claim 1 or 2, is characterized in that, described flyash or the slag percentage composition in described filter aid is 90% to 99.9%.
4. as the renovation process of the described filter aid of claims 1 to 3 any one, it is characterized in that, described renovation process comprises:
Control used described filter aid at 150~200 ℃ of drying 1~5h;
Perhaps control used described filter aid and calcine 2~5h under 200~500 ℃;
Perhaps with used described filter aid and carbon dioxide G﹠W at 80~200 ℃ of boiling 1-5h;
Perhaps with used described filter aid and carbonate, bicarbonate and water at 80~200 ℃ of boiling 1-5h;
Be perhaps 0.2~1.5% the aqueous solution that comprises strong oxidizer with used described filter aid and mass percent concentration, soak 1~5h under room temperature, wherein, described strong oxidizer comprises aqueous sodium hypochlorite solution.
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CN107793872A (en) * 2017-11-14 2018-03-13 安徽省神洲建材科技有限公司 A kind of Application way of flyash on exterior wall paint
CN107815168A (en) * 2017-11-14 2018-03-20 安徽省神洲建材科技有限公司 A kind of Application way of flyash on interior finish
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CN110215763A (en) * 2014-02-26 2019-09-10 艺康美国股份有限公司 The substitution additive of strengthening slurry dehydration
CN110215763B (en) * 2014-02-26 2021-06-15 艺康美国股份有限公司 Alternative additives to enhance slurry dewatering
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CN106732486A (en) * 2016-12-09 2017-05-31 广西珠江啤酒有限公司 A kind of regenerative filter aid regeneration transfer method based on filter for beer
CN107793872A (en) * 2017-11-14 2018-03-13 安徽省神洲建材科技有限公司 A kind of Application way of flyash on exterior wall paint
CN107815168A (en) * 2017-11-14 2018-03-20 安徽省神洲建材科技有限公司 A kind of Application way of flyash on interior finish
CN109289321A (en) * 2018-12-05 2019-02-01 大连海洋大学 It is a kind of using waste shell as new bio filtrate of raw material and preparation method thereof

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