CN109179461B - Low-sodium pseudo-boehmite, preparation method and device thereof - Google Patents
Low-sodium pseudo-boehmite, preparation method and device thereof Download PDFInfo
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- CN109179461B CN109179461B CN201811093173.7A CN201811093173A CN109179461B CN 109179461 B CN109179461 B CN 109179461B CN 201811093173 A CN201811093173 A CN 201811093173A CN 109179461 B CN109179461 B CN 109179461B
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- filtrate
- boehmite
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- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 title claims abstract description 52
- 239000011734 sodium Substances 0.000 title claims abstract description 34
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000012065 filter cake Substances 0.000 claims abstract description 140
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 238000005406 washing Methods 0.000 claims abstract description 72
- 239000000706 filtrate Substances 0.000 claims abstract description 70
- 239000012629 purifying agent Substances 0.000 claims abstract description 64
- 239000002002 slurry Substances 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 43
- 238000003825 pressing Methods 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 39
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 36
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 14
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 13
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 13
- 235000011054 acetic acid Nutrition 0.000 claims description 13
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 13
- 239000001099 ammonium carbonate Substances 0.000 claims description 13
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 13
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 12
- 235000006408 oxalic acid Nutrition 0.000 claims description 12
- 235000011007 phosphoric acid Nutrition 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 abstract description 18
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 12
- 239000003513 alkali Substances 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 5
- 239000013505 freshwater Substances 0.000 description 5
- 238000013019 agitation Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 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 3
- 239000002253 acid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
Images
Classifications
-
- 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
- C01F7/021—After-treatment of oxides or hydroxides
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a preparation method of low-sodium pseudo-boehmite. Adding the pseudo-boehmite slurry into a tape filter for filtering and washing, adding the filtered pseudo-boehmite slurry into a first filter cake tank, adding a third filtrate and a water purifying agent for stirring and washing, and then performing filter pressing to obtain a second filtrate; and adding the second filter cake into a second filter cake tank, adding hot water and a water purifying agent, stirring and washing, and then carrying out filter pressing to obtain the low-sodium pseudo-boehmite filter cake. The device comprises a belt filter, a first filter cake tank, a first filter press, a second filter cake tank and a second filter press which are connected in sequence. The water purifying agent is added in two steps, and the weak acidity of the water purifying agent is utilized to reduce the content of sodium ions (namely, the content of alkali) in the product, but other technical indexes of the product are not influenced. And the water purifying agent is easy to obtain, the addition amount is small, the increased cost can be ignored, and the economic benefit is remarkable. The content of sodium ions in the product can be more greatly washed off under the condition of not increasing washing hot water (or adding little hot water).
Description
Technical Field
The invention relates to the technical field of pseudo-boehmite, in particular to a low-sodium pseudo-boehmite, and a preparation method and a device thereof.
Background
The washing process of the common pseudo-boehmite comprises the process flow as shown in figure 1, filtering and washing are carried out by a tape filter, qualified filter cakes are obtained after washing is carried out by the tape filter, and Na is added2O% is less than 0.3%. The catalyst is mainly used as a catalyst and a binder for oil refining catalytic cracking in a petroleum catalyst, the quality of oil prepared by the produced catalyst is not too high, and the sodium content is high, so that the requirement on environmental protection at present cannot be met.
With the increasing importance of the country on the environmental protection and the corresponding higher and higher requirements on the quality of oil, the research and development of the low-sodium pseudoboehmite are necessary catalysts and carriers for producing high-end petroleum catalysts. In the prior art, the production of the low-sodium pseudo-boehmite is mainly realized by increasing the water consumption for washing and increasing the washing times. The water consumption for washing is 3-5 times of that of the normal product, and the alkali washing index (Na) is2O% content) often fails to meet the index requirements.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-sodium pseudo-boehmite, a preparation method and a device thereof, so as to solve the problems in the prior art.
In order to solve the problems, the invention provides a low-sodium pseudo-boehmite and a preparation method and a device thereof, and the adopted technical scheme is as follows:
the implementation of the invention discloses a preparation method of low-sodium pseudo-boehmite, which comprises the following steps:
adding the pseudo-boehmite slurry into a tape filter for filtering and washing to obtain a first filtrate and a first filter cake;
adding the first filter cake into a first filter cake tank, and simultaneously adding a third filtrate and a water purifying agent for stirring and washing to obtain stirring and washing slurry;
pumping the stirred slurry to a filter press for filter pressing to obtain a second filtrate and a second filter cake;
and step four, adding the second filter cake into a second filter cake tank, adding hot water and a water purifying agent for stirring and washing, and then sending to another filter press for filter pressing to obtain a third filtrate and a low-sodium pseudo-boehmite filter cake.
Further, the third filtrate is added to the first cake tank as a washing liquid.
Further, the second filtrate is added into a tape filter to wash the filter cake.
Further, the water purifying agent comprises one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid.
Further, in the second step, the addition amount of the water purifying agent is 2-10 kg/T-pseudo-boehmite.
Further, in the fourth step, the addition amount of the water purifying agent is 2-20 kg/T-pseudo-boehmite.
Further, in the fourth step, the adding amount of the water is 30-50 m3a/T-pseudoboehmite.
The implementation of the invention also discloses a device for preparing the low-sodium pseudo-boehmite, which comprises the following components:
the filter comprises a belt filter, a filter body and a filter cake, wherein the belt filter is provided with a pseudo-boehmite slurry inlet, a first filtrate outlet and a first filter cake outlet;
the filter cake device comprises a first filter cake tank, wherein a water purifying agent inlet, a first filter cake inlet communicated with the first filter cake outlet, a first stirring slurry outlet and a stirring device are arranged on the first filter cake tank.
The first filter press is provided with a stirring slurry inlet, a second filtrate outlet and a second filter cake outlet, and the stirring slurry inlet of the filter press is communicated with the stirring slurry outlet of the filter cake tank;
and the second filter cake tank is provided with a water purifying agent inlet, a hot water inlet, an inlet communicated with the second filter cake outlet, a second stirring slurry outlet and a stirring device.
And the second filter press is provided with a second stirring slurry inlet communicated with the second stirring slurry outlet, a third filtrate outlet and a low-sodium pseudo-boehmite filter cake outlet.
Further, a third filtrate inlet is also formed in the first filter cake tank, and the third filtrate outlet is connected with the third filtrate tank through a pump;
and a second filtrate inlet is also formed in the tape filter, and the second filtrate outlet is connected with the second filtrate inlet through a pump and a second filtrate tank.
The embodiment of the invention also discloses the low-sodium pseudo-boehmite prepared by the method.
The invention has the beneficial effects that:
the invention adds the water purifying agent by two times in a segmentation way, utilizes the weak acidity of the water purifying agent to reduce the content of sodium ions (namely the content of alkali) in the product, but does not influence other technical indexes of the product. And the water purifying agent is easy to obtain, the addition amount is small, the increased cost can be ignored, and the economic benefit is remarkable. The content of sodium ions in the product can be more greatly washed off under the condition of not increasing washing hot water (or adding little hot water).
Drawings
FIG. 1 is a schematic diagram of a prior art process of the present invention;
FIG. 2 is a process flow diagram of another embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
As shown in FIG. 2, the implementation of the invention discloses a preparation method of low-sodium pseudo-boehmite, which comprises the following steps:
adding the pseudo-boehmite slurry into a tape filter for filtering and washing to obtain a first filtrate and a first filter cake;
adding the first filter cake into a first filter cake tank, and simultaneously adding a third filtrate and a water purifying agent for stirring and washing to obtain stirring and washing slurry;
pumping the stirred slurry to a filter press for filter pressing to obtain a second filtrate and a second filter cake;
and step four, adding the second filter cake into a second filter cake tank, adding hot water and a water purifying agent for stirring and washing, and then sending to another filter press for filter pressing to obtain a third filtrate and a low-sodium pseudo-boehmite filter cake.
The implementation utilizes the weak acidity of the water purifying agent to reduce the alkali content in the product, and does not affect other technical indexes of the product. And the addition amount is small, the increase cost can be ignored, and the economic benefit is remarkable. The water purifying agent is added in two stages according to a certain proportion, and the effect is good. When the water purifying agent is added in sections for reverse washing, the washing liquid is washed with the pseudo-boehmite again, so that the removal of intermolecular alkali can be reduced. The water purifying agent is added in stages and is washed reversely, and the content of sodium ions in the product can be washed off more greatly under the condition of not increasing the washing water.
Preferably, the third filtrate is added to the first cake tank as a wash liquor. Further preferably, the second filtrate is added to a tape filter to wash the filter cake.
In the above embodiment, the water purifying agent includes one or more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid, and phosphoric acid.
In the above embodiment, in the second step, the amount of the water purifying agent added is 2-10 kg/T-pseudo boehmite. In the fourth step, the addition amount of the water purifying agent is 2-20 kg/T-pseudo-boehmite. The adding amount of the water is 30-50 m3a/T-pseudoboehmite.
The embodiment of the invention also discloses a device for preparing the low-sodium pseudo-boehmite, which comprises the following components:
the filter comprises a belt filter, a filter body and a filter cake, wherein the belt filter is provided with a pseudo-boehmite slurry inlet, a first filtrate outlet and a first filter cake outlet;
the filter cake device comprises a first filter cake tank, wherein a water purifying agent inlet, a first filter cake inlet communicated with the first filter cake outlet, a first stirring slurry outlet and a stirring device are arranged on the first filter cake tank.
The first filter press is provided with a stirring slurry inlet, a second filtrate outlet and a second filter cake outlet, and the stirring slurry inlet of the filter press is communicated with the stirring slurry outlet of the filter cake tank;
and the second filter cake tank is provided with a water purifying agent inlet, a hot water inlet, an inlet communicated with the second filter cake outlet, a second stirring slurry outlet and a stirring device.
And the second filter press is provided with a second stirring slurry inlet communicated with the second stirring slurry outlet, a third filtrate outlet and a low-sodium pseudo-boehmite filter cake outlet.
Preferably, in the above embodiment, the first filter cake tank is further provided with a third filtrate inlet, and the third filtrate outlet is connected to the third filtrate inlet through a pump and a third filtrate tank. Further preferably, a second filtrate inlet is further formed in the tape filter, and the second filtrate outlet is connected with the second filtrate inlet through a pump and a second filtrate tank.
The method and the device disclosed in the above embodiment, the washing of the low-sodium pseudo-boehmite is added with one stirring washing on the basis of the washing of the common pseudo-boehmite, and the washing liquid is reversed to a belt machine to wash the filter cake. Different dosages of water purifying agents are respectively added in the two stirring and washing processes. The proportion of the water purifying agent added into the second filter cake tank is larger, mainly aiming at reducing the sodium content in the product by combining more acid radical ions of the water purifying agent with sodium ions among molecules of the pseudo-boehmite and making the water purifying agent more soluble in water. The sodium content of the product is easy to reduce after the water purifying agent is added, but the amount of hot water for washing is not increased or not increased greatly. The hot water consumption is 35-40 m3The T is increased to 40-45 m3and/T. If the water purifying agent is not used, the consumption of hot water can be increased to 100m3More than T, and the content of sodium ions in the product is not easy to be reduced to be less than 0.1 percent. The dosage of the added water purifying agent is 5-100 Kg per ton of the product, and the increased cost is about 50-500 yuan/T, so the increased cost is little. The washing water amount added to the product is about 0-10T/T, and the cost is increased by about 0-70 yuan/T. And thus the ton cost is not increased much. A filter press and a stirring and washing tank which are additionally arranged on site can be modified by utilizing the filter press which is built in the original design and used for recovering the mother liquor, and the modification cost is lower.
Example 1
The pseudo-boehmite slurry is pumped to a belt filter by a pump to be separated and washed to obtain a first filtrate and a first filter cake, the first filtrate is sent to an alumina production system, the first filter cake is washed and then discharged into a first filter cake tank to be stirred and washed, and a water purifying agent is proportionally added into the first filter cake tank according to the discharging amount of the filter cake in the process of discharging the filter cake, wherein the water purifying agent comprises carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphorusOne or more of the acid is added in an amount of 2-10 Kg/T-pseudo-boehmite (i.e. the addition amount of 2-10 Kg/ton of pseudo-boehmite). And then pumping the stirred slurry into a filter press by a pump for filter pressing to obtain a second filtrate and a second filter cake, pumping the second filtrate into a tape filter for washing the filter cake, unloading the second filter cake into a second filter cake tank for continuous stirred washing, adding fresh water into the second filter cake tank, adding a certain amount of water purifying agent into the stirred washing process for washing, wherein the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, the adding amount of the water purifying agent is 2-20 kg/T-pseudo-boehmite, then performing filter pressing, and pumping the filter liquor obtained by filter pressing into a first filter cake tank for reverse washing by the pump. The filter cake is Na2O% qualified low-sodium pseudo-boehmite filter cake. The content of sodium ions is detected to be less than 0.1 percent.
Example 2
The pseudo-boehmite slurry is sent to a belt filter by a pump for separation and washing to obtain a first filtrate and a first filter cake, the first filtrate is sent to an alumina production system, the first filter cake is washed and then discharged into a first filter cake tank for agitation washing, a water purifying agent is proportionally added into the first filter cake tank according to the discharging amount of the filter cake in the process of discharging the filter cake, the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, and the adding amount is 2 Kg/T-pseudo-boehmite (namely the adding amount of the pseudo-boehmite per ton is 2 Kg). Then pumping the stirred slurry into a filter press by a pump for filter pressing to obtain a second filtrate and a second filter cake, feeding the second filtrate into a belt filter for washing the filter cake, unloading the second filter cake into a second filter cake tank for continuous stirred washing, adding fresh water into the second filter cake tank, adding a certain amount of water purifying agent into the stirred washing process for washing, wherein the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, the adding amount of the water purifying agent is 2 kg/T-pseudo-boehmite, then carrying out filter pressing, and pumping the filter liquid obtained by filter pressing into a first filter cake tank for reverse washing by the pump. The filter cake is Na2O% qualified low-sodium pseudo-boehmite filter cake. The content of sodium ions is detected to be less than 0.1 percent.
Example 3
Make the water thinThe aluminum-silicate slurry is pumped to a belt filter by a pump for separation and washing to obtain a first filtrate and a first filter cake, the first filtrate is sent to an aluminum oxide production system, the first filter cake is washed and then discharged into a first filter cake tank for agitation washing, a water purifying agent is proportionally added into the first filter cake tank according to the discharging amount of the filter cake in the process of discharging the filter cake, the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, and the adding amount is 10 Kg/T-pseudo-boehmite (namely the adding amount of each ton of pseudo-boehmite is 10 Kg). Then pumping the stirred slurry into a filter press by a pump for filter pressing to obtain a second filtrate and a second filter cake, feeding the second filtrate into a belt filter for washing the filter cake, unloading the second filter cake into a second filter cake tank for continuous stirred washing, adding fresh water into the second filter cake tank, adding a certain amount of water purifying agent into the stirred washing process for washing, wherein the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, the adding amount is 20 kg/T-pseudo-boehmite, then carrying out filter pressing, and pumping the filter liquid obtained by filter pressing into a first filter cake tank for reverse washing by the pump. The filter cake is Na2O% qualified low-sodium pseudo-boehmite filter cake. The content of sodium ions is detected to be less than 0.1 percent.
Example 4
The pseudo-boehmite slurry is sent to a belt filter by a pump for separation and washing to obtain a first filtrate and a first filter cake, the first filtrate is sent to an alumina production system, the first filter cake is washed and then discharged into a first filter cake tank for agitation washing, a water purifying agent is proportionally added into the first filter cake tank according to the discharging amount of the filter cake in the process of discharging the filter cake, the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, and the adding amount is 6 Kg/T-pseudo-boehmite (namely the adding amount of each ton of pseudo-boehmite is 6 Kg). Then pumping the stirred slurry into a filter press by a pump for filter pressing to obtain a second filtrate and a second filter cake, feeding the second filtrate into a belt filter for washing the filter cake, discharging the second filter cake into a second filter cake tank for continuous stirring washing, adding fresh water into the second filter cake tank, and adding a certain amount of water purifying agent for washing in the stirring washing process, wherein the water purifying agent comprises carbonic acid, ammonium bicarbonate, acetic acid and grassAdding one or a mixture of more of acid and phosphoric acid into 12 kg/T-pseudo-boehmite, then performing filter pressing, and pumping filter liquor obtained by filter pressing into a first filter cake tank by using a pump for reverse washing. The filter cake is Na2O% qualified low-sodium pseudo-boehmite filter cake. The content of sodium ions is detected to be less than 0.1 percent.
Example 5
The pseudo-boehmite slurry is sent to a belt filter by a pump for separation and washing to obtain a first filtrate and a first filter cake, the first filtrate is sent to an alumina production system, the first filter cake is washed and then discharged into a first filter cake tank for agitation washing, a water purifying agent is proportionally added into the first filter cake tank according to the discharging amount of the filter cake in the process of discharging the filter cake, the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, and the adding amount is 2 Kg/T-pseudo-boehmite (namely the adding amount of each ton of pseudo-boehmite is 10 Kg). Then pumping the stirred slurry into a filter press by a pump for filter pressing to obtain a second filtrate and a second filter cake, feeding the second filtrate into a belt filter for washing the filter cake, unloading the second filter cake into a second filter cake tank for continuous stirred washing, adding fresh water into the second filter cake tank, adding a certain amount of water purifying agent into the stirred washing process for washing, wherein the water purifying agent is one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid, the adding amount is 15 kg/T-pseudo-boehmite, then carrying out filter pressing, and pumping the filter liquid obtained by filter pressing into a first filter cake tank for reverse washing by the pump. The filter cake is Na2O% qualified low-sodium pseudo-boehmite filter cake. The content of sodium ions is detected to be less than 0.1 percent.
The alkali content of the pseudo-boehmite product is reduced from about 0.25 percent (lower than 0.3 percent) to about 0.07 percent (lower than 0.1 percent), and other indexes are not changed. By adding the water purifying agent and adding one reverse washing process, the washing water consumption does not exceed 20 percent of the water consumption of a normal product, the washing effect is good, the adding amount of the water purifying agent is small, the price is not high, and the cost is increased by 10 to 15 percent. But the selling price is 1.5 times of that of the common product, and the economic benefit is very good.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (6)
1. A preparation method of low-sodium pseudo-boehmite is characterized by comprising the following steps:
adding the pseudo-boehmite slurry into a tape filter for filtering and washing to obtain a first filtrate and a first filter cake;
adding the first filter cake into a first filter cake tank, and simultaneously adding a third filtrate and a water purifying agent for stirring and washing to obtain stirring and washing slurry;
pumping the stirred slurry to a filter press for filter pressing to obtain a second filtrate and a second filter cake;
adding the second filter cake into a second filter cake tank, adding hot water and a water purifying agent for stirring and washing, and then sending to another filter press for filter pressing to obtain a third filtrate and a low-sodium pseudo-boehmite filter cake;
in the second step, the adding amount of the water purifying agent is 2-10 kg/T-pseudo-boehmite;
in the fourth step, the adding amount of the water purifying agent is 2-20 kg/T-pseudo-boehmite;
the water purifying agent comprises one or a mixture of more of carbonic acid, ammonium bicarbonate, acetic acid, oxalic acid and phosphoric acid.
2. The method of claim 1, wherein the second filtrate is added to a tape filter to wash the filter cake.
3. The method according to claim 1, wherein the amount of the hot water added in the fourth step is 30 to 50m3a/T-pseudoboehmite.
4. An apparatus for preparing low-sodium pseudoboehmite for use in the method of any one of claims 1-3, comprising:
the filter comprises a belt filter, a filter body and a filter cake, wherein the belt filter is provided with a pseudo-boehmite slurry inlet, a first filtrate outlet and a first filter cake outlet;
the first filter cake tank is provided with a water purifying agent inlet, a first filter cake inlet communicated with the first filter cake outlet, a first stirring slurry outlet and a stirring device;
the first filter press is provided with a stirring slurry inlet, a second filtrate outlet and a second filter cake outlet, and the stirring slurry inlet of the filter press is communicated with the stirring slurry outlet of the filter cake tank;
the second filter cake tank is provided with a water purifying agent inlet, a hot water inlet, an inlet communicated with the second filter cake outlet, a second stirring slurry outlet and a stirring device;
and the second filter press is provided with a second stirring slurry inlet communicated with the second stirring slurry outlet, a third filtrate outlet and a low-sodium pseudo-boehmite filter cake outlet.
5. The apparatus of claim 4,
a third filtrate inlet is also formed in the first filter cake tank, and the third filtrate outlet is connected with the third filtrate tank through a pump;
and a second filtrate inlet is also formed in the tape filter, and the second filtrate outlet is connected with the second filtrate inlet through a pump and a second filtrate tank.
6. A low-sodium pseudoboehmite produced by the method of any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093173.7A CN109179461B (en) | 2018-09-19 | 2018-09-19 | Low-sodium pseudo-boehmite, preparation method and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093173.7A CN109179461B (en) | 2018-09-19 | 2018-09-19 | Low-sodium pseudo-boehmite, preparation method and device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109179461A CN109179461A (en) | 2019-01-11 |
| CN109179461B true CN109179461B (en) | 2021-03-23 |
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| CN110540222B (en) * | 2019-08-30 | 2022-04-19 | 中国铝业股份有限公司 | Preparation method of high-temperature-resistant activated alumina |
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