AU625812B2 - Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry - Google Patents
Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry Download PDFInfo
- Publication number
- AU625812B2 AU625812B2 AU21206/88A AU2120688A AU625812B2 AU 625812 B2 AU625812 B2 AU 625812B2 AU 21206/88 A AU21206/88 A AU 21206/88A AU 2120688 A AU2120688 A AU 2120688A AU 625812 B2 AU625812 B2 AU 625812B2
- Authority
- AU
- Australia
- Prior art keywords
- solution
- insoluble
- method further
- precipitate
- alkali
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims description 61
- 238000012545 processing Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 title description 11
- 239000000126 substance Substances 0.000 title description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000002244 precipitate Substances 0.000 claims description 13
- 239000000047 product Substances 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000001034 iron oxide pigment Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000001023 inorganic pigment Substances 0.000 claims description 4
- 239000000049 pigment Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 239000004480 active ingredient Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 239000003337 fertilizer Substances 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims 4
- 239000011260 aqueous acid Substances 0.000 claims 4
- 239000001569 carbon dioxide Substances 0.000 claims 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims 3
- WKPSFPXMYGFAQW-UHFFFAOYSA-N iron;hydrate Chemical compound O.[Fe] WKPSFPXMYGFAQW-UHFFFAOYSA-N 0.000 claims 3
- 239000000654 additive Substances 0.000 claims 2
- 230000000996 additive effect Effects 0.000 claims 2
- 239000011575 calcium Substances 0.000 claims 2
- 239000011777 magnesium Substances 0.000 claims 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 241001135382 Hypostomus agna Species 0.000 claims 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 235000010678 Paulownia tomentosa Nutrition 0.000 claims 1
- 240000002834 Paulownia tomentosa Species 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- RWGFKTVRMDUZSP-UHFFFAOYSA-N cumene Chemical compound CC(C)C1=CC=CC=C1 RWGFKTVRMDUZSP-UHFFFAOYSA-N 0.000 claims 1
- 150000001993 dienes Chemical class 0.000 claims 1
- 239000008394 flocculating agent Substances 0.000 claims 1
- 239000011256 inorganic filler Substances 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000011734 sodium Substances 0.000 description 6
- 238000001311 chemical methods and process Methods 0.000 description 4
- 239000012467 final product Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241001581492 Attila Species 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001572175 Gaza Species 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004182 chemical digestion Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- 235000015250 liver sausages Nutrition 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- XYSQXZCMOLNHOI-UHFFFAOYSA-N s-[2-[[4-(acetylsulfamoyl)phenyl]carbamoyl]phenyl] 5-pyridin-1-ium-1-ylpentanethioate;bromide Chemical compound [Br-].C1=CC(S(=O)(=O)NC(=O)C)=CC=C1NC(=O)C1=CC=CC=C1SC(=O)CCCC[N+]1=CC=CC=C1 XYSQXZCMOLNHOI-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- RLQWHDODQVOVKU-UHFFFAOYSA-N tetrapotassium;silicate Chemical compound [K+].[K+].[K+].[K+].[O-][Si]([O-])([O-])[O-] RLQWHDODQVOVKU-UHFFFAOYSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
- C05D9/02—Other inorganic fertilisers containing trace elements
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/24—Magnesium carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/066—Treatment of the separated residue
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
- C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Analytical Chemistry (AREA)
- Materials Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Description
I
AU-Al -21206/885 WORLD INTELLECTUAL PROPERTY ORGAVTI' PCT lntemational Bureau INTERNATIONAL APPLICATION PUBLISHED Ui4DER THE PATENT COOPERATION TREATY (PCT) (51) International Patent Clissification 4. (11) International Publication Number: WO 89/ 00980 C02 F 9/00, 1/58, 1/64 Al (43) International Publication Date: 9 February 1989 (09.02.89) (21) Interniational Application Number: PCT/t U88100055 (22) International Filing Date: (31) Priority Application Number: (32) Priority Date: (33) Priority Country: 29 July 1988 (29.07.S8) 3524/87 31 July 1987 (31.07.87) LEBENYI, Zolifin [HU/HU]; Leni'a u. 183, H-9200 Mosonmagyarovar PINTER, J~nos [RU/HU]; Kossuth L. u. 84, H-9200 Mosonmagyar6v~r (HU).
(74) Agent: PATE NT A ND LA W OFFI CE FO R I NTE R- NATIONAL AFFAIRS, Dalszinh~iz u. 10, H-1061 Budapest (H U).
(81) Designated States: AT (European patent), AU, BE (European patent), CH (European patent), DE (European patent), FR (European patent), GB (European patent), IT (European patent), LU (European patent), NL (European natent), SE (European patent), US.
Published Withi international search report.
(71) Applicant (fc-r all designated~ States except US): AQUA- TECH KORNYEZETVEDELMI ES MtJSZAKI FEJ LESZT6 KISSZOVETKEZET [HIU/H Pf, 737, H-1365 Budapest (HU), (72) Inventors; and Inventors/Applicants (for US only) SZIRMAI, Endre [HU/HU]; N~phadsereg u, 30, H-1055 Budapest BABUSEK, Sitndor Epitb i t 28/b, H-1184 Budapest BALOGHJ Gaza [HU/HU]; Haj6s u. 1S, H-1065 Budapest NEDVES, Attila [RUJ/RU]; N~dor u, 17, H-1205 Budapest (HU).
HORVATH, Gyula Fej~r L, u, 34, H-1I1lS Budapest (HU), (54)Tifle; METHOD FOR THE MULTISTAGE, WASTE-FREE PROCESSING OF RED MUD TO RECOVER BA- SIC MATERIALS OF CHEMICAL INDUSTRY (57) Abstract The method of th 4 invention is advantageously applicable to realize a multistage chemical process during which liquid clarifiers suitable fot th purification of Water and sewage, furthermore, Fine-disperse pulverulent solid products utilizable as paint pigments ano 1- 1 lers may b, -,cwuered, Each final product of the multistage chemical processes is a useful material, so the whole technology is waste-free, A-0- I P- 2 0 A PR 198q~
AUSTRALIAN
I MAR 1989 PATE, IT OFFICE
LI
-1- METHOD FOR THE MULTISTAGE, WASTE-FREE PROCESSING OF RED MUD TO RECOVER BASIC MATERIALS OF CHEMICAL INDUSTRY The method of the invention is advantageously applicable to realize a mult stage chemical process during which liquid clarifiers suitable for the purification of water and sewage, furthermore, fine-disperse pulverulent solid products utilizable as paint pigment and filler, may be recovered. Each final product of the multistage chemical processes id a useful material, so the whole technology is waste-free.
It is well-known, that red mud, the final waste of the Bayer alumina production, is a great trouble all over the world. This material is alkaline and it heavily contaminates the waters leal; from the red mud storage places owing to both its alkali and iron oxide content, furthermore, in dry condition D its fine fly-powder is easily blown away by the wind. The large quantity of red mud gives also trouble, since its storage needs an enormous area, That is why a number of processes, among them several patents are concerned with the treatment of red mud. For instance, accDrding to FRG Patent No. 1.592.104 solid granules are prepared from red mn-id which is dissolved in the water to be purified. This material consists primarily of iron and aluminium sulfate.
Charging of the solid,water purifying agent is cumbersome, it dissolves slowly and results in plenty of remaining insoluble precipitate.
With the exception of the application No. Ml-1055/1987, filed on April 13, 1987, all these processes are, however, single-stage technologies, in the course of which either by-products (wastes) also arise, or the final product has a large refuse content, thus the specific efficiency of the product is small during the utilization. In case of multistage, more complex processes even more wastes arise and usually their object is only to recover a single particular target product.
S/ 911203,EJHCMC.003,2106,1ct4 8 \CC'* il -2- The object of the present invention is to provide a method where, in the course of several consecutive chemical digestions repeatedly "products" are obtained that are valuable end-products even without any further processing and separation, so all the important components of red mud are utilized as various final products, thus the entire technologic process is waste-free.
V
a a a. a 4 a a 4** The present invention is based partly on the recognition that in a reaction with CO 2 or CO 2 containing flue gas the alkaline sodium content hindering the processing of red mud may be dissolved up to pH 5 to 9 in the form of Na 2 C03, by leaving behind the other "useful" materials. This is the first useful product. The second cognition serves for the reprocessing of the mud recovered by filtration, in the course of which primarily inorganic pigment powders are prepared in several divergent technologic processes.
The essence of the method of the invention consists in that several series of technologic operations may be brought about which transform, in parallel akid/or series connection, the mud of the first operation into various target products free of wastes. First divergent step: the filtered mud is washed with water, a slurry is made thereof which is then refiltered. The washing water is returned into the sodium recovery process.
The filtered mud is: A) dried, B) reprocessed.
A) The dried product may be sold as a cheap inorganic pigment, such as concrete paint, etc.
25 B) Further divergent possibilities during reprocessing: 1. The muddy slurry is treated, under pressure, in a supersaturated state with COq, in the course of which the C. and Mg content are dissolved in the form of Ca- and MgHC03 solutions and may be separated from the other mud fractions by filtration. The solution may be utilized to produce Ca-, MgC03 or -sulfate or it may be introduced diluted into the channel. The filtered mud is treated in a third process as described herebelow in point 2.
i i 'i A! 9112o3,EJHCMC.0o3,2126.e I -3.
2. Without recovering the Ca and Mg content, the muddy slurry is reacted, while mixed, with cold, 10-33% HC1 solution in a stainless steel tank, preferably for 2 to 3 hours. During the parallel reactions the bulk of the Ca, Mg, Fe and Ti content as well as a minor part of the Al content go into solution, the whole quantity of Si (in the form of SiO 2 the bulk of the Al content and other micro-impurities remain in the floating, fine disperse phase. The dissolved product is a solution with clarifying activity.
The mud removed by filtration may be sold in a given case cleaned by a further acid treatment or washing and after drying as a varnish paint, a filler used in the rubber or plastics industry i or as a filter aid.
3. The Ca- and Mg-containing mud, or the mud filtered according to method 1 is reacted with cc. hydrochloric acid, in an S"enamelled double autoclave, while boiling and mixing. During S this, the (Ca, Mg) Fe, Al and Ti content, as well as other S' -im purities of the mud are dissolved and there arises a finedisperse solid phase with high SiOz content (70 on an average) and containing furthermore A1 2 0 3 and TiO 2 The solution may be utilized as a clarifier and the solid part, after washing and I drying, in the fields described in point 2.
i 4. The filtered mud of method 1 is treated with (preferably 5-50 citric acid in order to recover the Fe content. The filtered mud of the treatment is utilized as a filler, and the Fe-citrate solution is utilized as an active ingredient of fertilizers containing microelements, or Fe 2
CO
3 pigment may be obtained by evaporation and heating the solution or precipitating it further, filtering, drying and heating it.
911203XEJHCMC,003,2126.Ie3
V
-4- In the course of processing the mud of method 1, iron oxide pigments may be produced from the solutions obtained according to methods 2 and 3, by treating the solutions with alkali, during which treatment a Fe/OH/3 precipitate is separated. The precipitate is filtered, washed, dried and heat treated. The final product is depending on the heat treatment a yellow, red or black pigtient the shade of which depends on the purity.
The material with high SiO 2 content of the methods 2, 3 and 4 is also reprocessible by reacting it with a concentrated NaOH solution at a temperature of 100 to 140 OC under pressure or at atmospheric pressure, with constant mixing. The solution obtained may be utilized as a material corresponding to water glass. If the SiO 2 -containing materiaL is a powder, it is heated, mixed with soda (Na 2
CO
3 or K 2
CO
3 preferably with the product isolated from the Na 2
CO
3 solution obtained in the first step in the ratio Na 2
O
SiO 2 necessary for soda water glass or potassium water glass to obtain solid S. water glass, by the conventional well-known technique. The water glass may then be dissolved, in hot water, under pressure.
I I t I a« 91i203,EJHChC.003,21206.1e04
Claims (20)
1. A method for the processing of red mud, said red mud comprising a slurry of metal oxides, including Fe 2 0 3 A1 2 0 3 TiO 2 SiO 2 and Na 2 O, said method comprising a) reacting said slurry with carbon dioxide gas whereby to form a product including a solution of Na 2 C0 3 the reaction with carbon dioxide gas being allowed to proceed until said product attains a pH level of from 5 to 9; b) filtering the product of step a) to separate the solution of Na 2 CO 3 therefrom, thereby leaving a filtered mud; and c) treating said filtered mud to form one or more inorganic pigments, fillers and/or flocculants.
2. A method as claimed in claim 1 wherein the treatment of said filtered mud consists essentially of drying it to form an inorganic pigment. *4
3. A method as claimed in claim 1 wherein the treatment of said filtered mud comprises supersaturating the filtered mud with carbon dioxide under pressure to fractionate the filtered mud into a soluble fraction of CaHC03 and NaHCO 3 and an insoluble fraction comprising oxides of Fe, Al, Ti, and Si, said method further comprising a) separating said soluble CaHC03 and MgHCO 3 fraction from said insoluble fraction, b) digesting the insoluble fraction in an aqueous acid solution to form a soluble part comprising dissolved Fe, Al and Ti and an insoluble part comprising a high content of SiO 2 and c) separating said insoluble part from said soluble part whereby the insoluble part may be used as an additive and the soluble part may be used as a flocculant. 920505ehspe03,2206spe,5 920505,ejhspe,035,2l206.spe,5 -6-
4. A method as claimed in claim 3, wherein said method further comprises treating said soluble fraction to form a sulfate or carbonate of calcium or magnesium. A method as claimed in claim 3, wherein said aqueous acid solution comprises about 10-33% HC1.
6. A method as claimed in claim 1, wherein the treatment of said filtered mud comprises digesting the filtered mud with an aqueous acid solution to form a soluble portion comprising dissolved Ca, Mg, Fe, Al and Ti and an insoluble p. -tion comprising a high content of SiO 2 and separating said insoluble portion from said soluble portion whereby the insoluble portion may be used as an additive and the soluble portion may be used as a flocculant.
7. A method as claimed in claim 10, wherein said aqueous acid solution comprises 10-33% HC1. S,8. A method as claimed in claim 3, said method further comprising reat.ing the insoluble part with NaOH while mixing at a temperature of about 100 to 140 0 C to form a water glass solution.
9. A method as claimed in claim 3, said method further comprising washing and drying said insoluble part to form a powder which is substantially acid-free and treating said powder with Na 2 CO 3 or K 2 CO 3 to obtain water glass. A method as claimed in claim 9, wherein the powder is treated with Na 2 CO 3 which is separated from the product in step b) of claim 1. 92o05,ejhs l e O3521264pe,6 i -7-
11. A method as claimed in claim 1, wherein the treatment of said filtered mud comprises digesting the filtered mud with citric acid to form a Fe-citrate solution ind an insoluble fraction, whereby the Fe-citrate solution may be used as an active ingredient in a fertiliser and the insoluble fraction may be used as a filler.
12. A method as claimed in claim 11, said method further comprising evaporating and heating the Fe-citrate solution to obtain a FeCO 3 pigment.
13. A method as claimed in claim 11, said method further comprising treating the Fe-citrate solution with an alkali to separate FeOH 3 precipitate and converting the precipitate into iron oxide pigment.
14. A method as claimed in claim 3, wherein the alkali is NaOH or solution, 9 9 A method as claimed in claim 3, said method further comprising treating the soluble part formed in step b) of claim 2 with an alkali to separate FeOH 3 precipitate awd converting the precipitate into iron oxide pigment. 9i 9
16. A method as claimed in claim 15, wherein the alkali is NaOH or NH 4 OH solution. S17. A method as claimed in claim 6, said method further comprising treating the soluble portion with an alkali to separate FeOH3 precipitate and converting the precipitate into iron oxide pigment.
18. A method as claimed in claim 17, wherein the alkali is NaOH or NH 4 OH solution. 9 50,ejhspe.035,21206.spe,7 Jt/ V -8-
19. A method as claimed in claim 6, said method further comprising reacting the insoluble portion with NaOH while mixing at a temperature of about 100 to 140 0 C to form a water glass solution. A method as claimed in claim 6, said method further comprising washing and drying said insoluble portion to form a powder which is substantially acid-free and treating said powder with Na 2 CO 3 or K 2 CO 3 to obtain water glass.
21. A method as claimed in claim 3, said method comprising treating the soluble part formnd in step b of claim 7 with an alkali to separate FeOH3 precipitate and converting the precipitate into iron oxide pigment.
22. A method a claimed in claim 21, wherein the alkali is NaOH or NH 4 OH solution. 23, A method as claimed in claim 6, said method further comprising treating the soluble portion with an alkali to separate FeOH 3 precipitate and Sconverting the precipitate into iron oxide pigment.
24. A method as claimed in claim 23, wherein the alkali is NaOH or NH 4 OH solution. A method as claimed in claim 6, said method further comprising reacting the insoluble portion with NaOH while mixing at a temperature of about 100 to 1400 to form a water glass solution. A*L 9 920505,ejhspe.03.21206,spe,8 -9-
26. A method as claimed in claim 6, said method further comprising washing and drving said insoluble portion to form a powder which is substantially acid-free and treatingo said powder with Na 2 CO 3 or K 2 C0 3 to obtain water glass.
27. A method acco--uing to any one of claims 1 to 26 substantially as hereinbefore described with reference to the Examples. DATED this 5th day of May, 1992 AQUATECH KORNYFhZETMEDELMI ES MUSZSKI JEDLESZTO KISSZOVETKEZET By Its Patent Attorneys DAVIES COLLISON CAVE ft. ft. ft ft ft ft ft. ft. ft... ft.., ft. ft 'ft ft ft ft ,ft ft ft ft ft ft ft. ft ft ft.. ft ft. ft ft. 4* ft ft ft ft ft ft. ft ft.,. ft ft ft ft JS I ~ft ft 4 020505,ejhspe,035,212OW.spe,9 INTERNATIONAL SEARCH REPORT Irtorn~ne~oiietln~oprT/HU 88/00055 I. CLA11111PICAT100 OF SUBJECT 111AMWIN (it several classification symbols aopiy. rndicatio Will) ACCWvdJ4 to btflAVOMOi Paet Closeftcation (IPCI or to b"t Wtbnali Clapaificotionl and tP'- IPC: C 02 F 9/00,1/58,1/64 It WIRLD11 SeARCHED Mlinimumi Documnentation Setarcheid Ciessfleat,,. vO~ ,CtasGW="inf Symbols Int.Cl. 4 C 02 F 9/00,1/58,1/64,1/00,11/00,1/52 Dow~etts Srchedo e~e than Mlinimnum Docuffiehm~ion to thWi Want that such Documneef tti rIncludied In the Fields 5earehod 0 AT Ill. DOCUMENTS CONSIDERED TO UK1 RELEVA NT' Category I Citation of Document, 11 with Inldication, whers appotalle, ot the relevant ple"a 11 Relevant to Claim No 13 A.EP, Al, 0 072 885 (DECONTA) 02 March 1983 (1) 1(02.03.83), see abstract; page 9, line 25 page 10, line 19. A'EP, l, 0 47 044(M-T.ER) 10 March 1982(1 (10.03.82), see claims 1,3. A'DE, A, 2 058 630 (DAIMLEE-BENZ) 31 May 1972() (31.05.72), see claims A CH, A5, 661 264 (GRUTER) 15 July 1987() (1507,7),see abstract. A'US, A, 4 629 570 (KENNEDY) 16 December' 1986 i(2) (16,12.86), see abstract; column 2, Jlies
55-67. AI-IS, A, 4 678 586 (KEARNEY) 07 July 1987 (07.07.87), see abstract. Special cotegnofle re d disormentt 6 totr dOtUMOMIt published filife the Ilnabiitotisi Aline date doculment defining the gWoralst ate of the GM Which Is n&I 4o onrmlt oets an" not in cenowit with the asoicmilor out canadorad o b atpartcuit rlevncecited 10 Uneortand the principle of thosery underlying earlier decumnt lout published en of after tho imntenoieie document ot particuler roeoencet the claimed invention Aline data cannot be cenaidortd nOirol or carnfnet be climsidored to documeint which may 1 ntrOw doubls en "rOnlty cleim(s) Of involve an Inventive a"o Mich Is Cied to estabisah the publication OVe at owher decurrint of potW4ulleF smleacE thei clelmhod invenition Citation or ether asecis reason tas amofld) cannot be censiored to invgsaft anWfOWO~ It" whei the documntif rolerrngt to an oral dipcieeurs, use, inhibtion Or document Is cembenod1 With 01W of IWer ether such docil. ote "Me eents, such gsm W"n evvil" tO a peron M&illed dscilwion WWl to the in5'-,otieeil Aing ado but il In v at, lot than the p"irMy ame sminvell cumen m moflftfof the sanit patent torehty IV, CIRTIPICATI@N Dats at the Actual Comrpleton of the InternaIlea Search 0 0 bt tIi ettttetiS~ pr 16 eptmbr 188(16Q988) 07 October 198 (7138 Internationtal Searcihing AuthwMt Spa ofa Aitierapd 014w AUSTRIAN PATEMIT OrF'FICE Pennm NC1IS1AI lseonid ahwa4wisosy t11110 Anhang zurn intct'natio- Annex to the International Annexe au rapport de nalen Rechs-rchenbericht Search Report on Interna- recherche internationnolc Uber die internationale tional Patent Application relatif a la demande de Patentanmeldung No.PCT/HU 88/00055 brevet international Nr. nO. In diesen Anha' sind This Annex lists the patent La pr~sente ndique die Mtglieder der family members relating to les membres de la famille de Patentfamilien der im the patent documents cited brevets relatifs aux docu- obengenannten interna- in the above-mentioned Inter- ments de brevets cit~s dans ti .nalen Recherchenbe- national search report. The le rapport de recherche inter- richt angefUhrten Austrian Patent Office is in nationalevis& ci-dessus. Les Patentdokumente ange- no way liable for these par- renseignements fournis sont geben. Diese Ang~ben ticulars which are merely donn~s i titre indicatif et diene nu urUte-rich- given for the purpose of in- nengagent pas la responsa- tung und erfolgen ohne formation. bilitb de l'Office autrichien Gewahr. des brevets. Im Recherchenbericht Datum der Mitglied(er) der Datum der angefUhrtes Patent- Verbffentlichung Patentfamilie Ver~ffentlichung dokument Publication Patent family Publication Patent document cited date member(s) date in search report Date de Membre(s) de la Date de Document de brevet cit& publication famille de publication dans le rapport brevets de recherche 072 885 02/03/1983 AT-E 19 505 15/05/1986 '*-30/04/1986 JP-T2-59--500 088 19/01/1984 WO-Al- 8 302 446 21/07/1983 047 044 10/03/1982 JP-A2-57-0'/5 188 11/05/1982 CH-AS- 661 264 15/07/1987 DK-AO- 5 3,32/84 08/11/1984 DK-A 5 332/84 10/05/198H, DE-A -2 058 630 31/ 3/l972 None US-A -4 629 570 16/12/1986 CA-Al- 1 195 e,4 3 15/ 1 C/ 19 ev US-A -4 678 586 07/07/1987 AU-Al- 38 873/$5 27/08/19BE JP-T2-61-5Ql1 132 12/06/198C WO-Al- 8 503 459 15/08/198P CA-Al- 1 233 735 08/03/198E EP-A1- 0 205 429 30/12/198C GB-AO- 8 403 246 14,/03/1984 ZA-A -8 500 684 25/09/1985
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU3524/87 | 1987-07-31 | ||
HU873524A HU209326B (en) | 1987-07-31 | 1987-07-31 | Method for multistage wasteless processing of red sludge and extracting chemical base materials from it |
PCT/HU1988/000055 WO1989000980A1 (en) | 1987-07-31 | 1988-07-29 | Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2120688A AU2120688A (en) | 1989-03-01 |
AU625812B2 true AU625812B2 (en) | 1992-07-16 |
Family
ID=26317648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU21206/88A Ceased AU625812B2 (en) | 1987-07-31 | 1988-07-29 | Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry |
Country Status (1)
Country | Link |
---|---|
AU (1) | AU625812B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0047044A1 (en) * | 1980-09-03 | 1982-03-10 | Chemap AG | Method of decolorizing sewage |
EP0072885A1 (en) * | 1982-01-19 | 1983-03-02 | industrie automation Sondertechnik GmbH & Co | Process for the decontamination of natural and technical sludges |
US4629570A (en) * | 1981-11-09 | 1986-12-16 | Dowell Schlumberger Incorporated | Removal of iron from chelant solutions |
-
1988
- 1988-07-29 AU AU21206/88A patent/AU625812B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0047044A1 (en) * | 1980-09-03 | 1982-03-10 | Chemap AG | Method of decolorizing sewage |
US4629570A (en) * | 1981-11-09 | 1986-12-16 | Dowell Schlumberger Incorporated | Removal of iron from chelant solutions |
EP0072885A1 (en) * | 1982-01-19 | 1983-03-02 | industrie automation Sondertechnik GmbH & Co | Process for the decontamination of natural and technical sludges |
Also Published As
Publication number | Publication date |
---|---|
AU2120688A (en) | 1989-03-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5053144A (en) | Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry | |
US4224287A (en) | Process for the preparation of pure aluminum oxide | |
US3627679A (en) | Effluent treatment processes | |
US4119698A (en) | Reclamation treatment of red mud | |
CA2124570A1 (en) | Improved process for separating red mud in production of alumina from bauxite | |
CA1073185A (en) | Method for the large-scale industrial obtaining of magnesium oxide of high purity | |
CN109504120A (en) | A kind of clean method for producing of high-purity copper phthalocyanine | |
HU184318B (en) | Process for reducing iron content of raw materialsprocess for decreasing the iron content of raw mat containing iron, silicon and aluminium, as well aerials conta ining iron, silicon and aluminium ands for producing in the given case aluminium oxide for preparing iron oxide further in a given case aluminium oxide concentrate concentrate | |
EP0150033B1 (en) | Process for producing highly pure magnesium hydroxide | |
US5277816A (en) | Process for producing titanium dioxide | |
ZA200105624B (en) | Lime treatment. | |
AU625812B2 (en) | Method for the multistage, waste-free processing of red mud to recover basic materials of chemical industry | |
US6555077B1 (en) | Organic impurity removal process for bayer liquors | |
US5298169A (en) | Treatment of waste sulfuric acid by gypsum precipitation in a titanium dioxide process | |
WO2001077021A1 (en) | Production of strontium carbonate from celestite | |
US4366129A (en) | Process for producing alumina and ferric oxide from aluminium carriers with high iron and silicon content | |
US4729881A (en) | Hydrometallurgical process for the production of beryllium | |
CA2149138C (en) | Process of preparing a caesium and rubidium salt solution having a high density | |
CN102220498A (en) | Method for preparing fine vanadium slag | |
CN115571922A (en) | Process for recovering sodium carbonate and magnetic iron oxide from red mud by using carbon dioxide | |
CN112607772B (en) | Method for extracting high-purity titanium dioxide from olefin polymerization industrial waste acid residues | |
JP4208971B2 (en) | Recovery of molybdenum epoxidation catalyst | |
CS232711B2 (en) | Parting method of ferrous,clayey and manganous impurities from magnesium chloride solution in hydrogen chloride | |
US5437849A (en) | Method of processing vanadium-containing residues | |
KR100536261B1 (en) | Recovery method of alumina by using sulphuric acid leaching method from molten incinerator slag of sewage sludge |