CN111484222B - Bayer process red mud concentration process suitable for sintering process production - Google Patents
Bayer process red mud concentration process suitable for sintering process production Download PDFInfo
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- CN111484222B CN111484222B CN202010297018.8A CN202010297018A CN111484222B CN 111484222 B CN111484222 B CN 111484222B CN 202010297018 A CN202010297018 A CN 202010297018A CN 111484222 B CN111484222 B CN 111484222B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Treatment Of Sludge (AREA)
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Abstract
The invention relates to the technical field of red mud treatment, and particularly discloses a process for removing organic matters by concentrating Bayer process red mud, which is suitable for sintering process production, wherein a filter press is adopted to filter the Bayer process red mud, and the water content of the filtered red mud is not more than 30 percent; adding a sodium carbonate solution and a sodium aluminate washing solution into the filtered red mud, and grinding the mixture by using a mill to prepare slurry, wherein the sodium aluminate washing solution is a solution generated by aluminum hydroxide crystals in a Bayer process decomposition process; pumping the qualified raw slurry into a sintering kiln for sintering. According to the method, the Bayer process red mud is firstly concentrated to a state with lower water content, and then sodium aluminate washing liquor with extremely high energy consumption for treatment of enterprises is additionally introduced, so that the fluidity and the water content of the slurry are ensured, the sintering condition of the red mud is met, and the method for removing organic matters can be realized.
Description
Technical Field
The invention relates to the technical field of red mud treatment and organic matter removal, in particular to a process for removing organic matters by concentrating Bayer process red mud suitable for sintering process production
Background
The Bayer process has become the leading process for producing alumina in the world, and comprises a digestion process and a decomposition process, wherein the digestion process is to separate out sodium aluminate solution and separate out red mud from bauxite, the decomposition process is to add aluminum hydroxide into the sodium aluminate solution as seed crystal, the aluminum hydroxide seed crystal generates agglomeration under certain process conditions, so that aluminum hydroxide crystals are gradually separated out, and then the aluminum hydroxide crystals are calcined to obtain the alumina.
At present, because of the limitation of quality reduction of domestic bauxite and environmental protection factors, the national alumina industry starts to use a large amount of foreign bauxite, and the foreign bauxite has high organic matter content, so that a series of problems of tank collapse of a settling tank, product granularity refinement, production reduction caused by a large amount of foam in a decomposition tank and the like are caused in production, and therefore, different alumina enterprises actively strive to find a method for removing organic matter according to the conditions of the enterprises. I can effectively remove the organic matters by utilizing the method for calcining the organic matters by utilizing the advantages of the sintering method, so that oxalate in the sodium aluminate solution is maintained below the equilibrium concentration, and the condition of organic matter outbreak cannot occur.
In addition, because the raw slurry of the sintering method has certain requirements on moisture, economic indexes such as coal consumption for sintering and the like can be increased if the moisture is too high, and the raw slurry of the sintering method has too low flowability and is not beneficial to normal sintering, after the sodium aluminate washing liquor containing organic matters is added, the organic matters can be effectively controlled, the moisture of the raw slurry can be strictly controlled, and the yield of the sintering method is not influenced.
Therefore, the method is more effective compared with the methods of the international aluminum industry force group, the south mountain aluminum industry and the Weiqiao aluminum industry, has low cost and simple flow, can reduce the loss of aluminum oxide, is old due to the fact that a plurality of devices are used, greatly reduces the investment cost, and has short recovery period, simple operation and quick response.
Disclosure of Invention
The invention provides a process for removing organic matters by concentrating Bayer process red mud, which is suitable for sintering process production, and aims to solve the problems of high energy consumption and large enterprise burden of removing the organic matters in sodium aluminate washing liquor in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a process for removing organic matters from Bayer process red mud by concentration, which is suitable for sintering process production, comprises filtering Bayer process red mud by a filter press, wherein the water content of the filtered red mud is not more than 30%; adding a sodium carbonate solution and a sodium aluminate washing solution into the filtered red mud, grinding the mixture by using a mill to prepare red mud slurry, and blending the red mud slurry to obtain raw slurry; pumping the raw slurry into a sintering kiln for sintering, wherein the sodium aluminate washing solution is a solution generated by aluminum hydroxide crystals in a Bayer process decomposition process.
The technical principle and the effect of the technical scheme are as follows:
1. according to the scheme, the water content of the Bayer process red mud after compression is controlled by the filter press to be not more than 30%, so that a sodium aluminate washing liquor can be additionally added in the process of preparing the slurry, the sodium aluminate washing liquor is the washing liquor of aluminum hydroxide crystals in the decomposition process of the Bayer process, and the content of organic matters (such as oxalate) in the washing liquor is high, so that the removal of the organic matters in the washing liquor is completed while the red mud is sintered.
2. In addition, because the red mud needs to be pumped into a sintering kiln, the slurry of the sintering kiln needs fluidity and has certain requirements on the moisture content, a belt filter is usually adopted to filter the red mud, and thus, the slurry prepared from the red mud is ensured to contain certain moisture.
According to the method, the conventional process is broken through, the Bayer process red mud is concentrated to a state with low water content, and the sodium aluminate washing liquor with extremely high treatment energy consumption for enterprises is additionally introduced to ensure the fluidity and the water content of the slurry, so that the sintering condition of the red mud is met, and the removal of organic matters in the sodium aluminate washing liquor is completed.
Further, the sodium carbonate solution is sodium carbonate deposited in each apparatus used in the bayer process two-stage dissolution process. The sodium carbonate is used as the raw material for sintering the red mud, so that the addition amount of purchased sodium carbonate in a raw material sintering process is reduced, and the production cost is reduced.
Further, the moisture of the raw slurry is 38-41%. The moisture of the raw slurry is controlled to be 38-41%, the stable operation of the sintering kiln is ensured, and the coal consumption of the sintering kiln is also ensured to be at a normal level.
Furthermore, the filter press is a plate-and-frame filter press, and the filter press further reduces the moisture in the filtered red mud by increasing the space of the filter chamber and increasing the pressure. The water content of the red mud is reduced, and sodium aluminate washing liquor can be additionally added to remove organic matters.
Further, the raw slurry is prepared by mixing the ground red mud slurry with limestone, coal and soda ash.
Further, the raw slurry is calcined in a sintering kiln, so that organic matters can be burned, and intermediate product clinker is generated.
Drawings
FIG. 1 is a flowchart of example 1 of the present invention;
FIG. 2 is a cross-sectional view of the filter frame of a filter press assembly according to example 2 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the filter frame 10, a feed inlet 11, a cavity 12, an elastic layer 13, a hollow plate 14, a feed pipe 15, a discharge pipe 16, a through hole 17 and a spring 18.
Example 1
A Bayer process red mud concentration process suitable for sintering process production adopts a plate and frame filter press to filter Bayer process red mud, the model of the plate and frame filter press in the embodiment is KZGF450/2000-U, the Bayer process red mud in the embodiment refers to bauxite, after being crushed, the bauxite is wet-milled together with lime and circulating mother liquor (caustic alkali solution) to prepare ore pulp, the ore pulp is subjected to a two-stage digestion process in 'a bauxite digestion process' in my declaration to separate the red mud, and the moisture content of the Bayer process red mud obtained by the plate and frame filter press is lower than 30%.
With reference to the flow chart of fig. 1, a sodium carbonate solution and a sodium aluminate washing solution are added into the filter-pressed bayer process red mud to prepare red mud slurry by using an overflow mill, the red mud slurry is mixed with limestone, coal, soda ash and the like to prepare qualified raw slurry, namely, the water content of the raw slurry is 38-41%, and then the raw slurry is pumped into a sintering kiln for sintering.
In the embodiment, in the two-stage digestion process of bauxite, the raw materials of the bauxite adopt lime and caustic alkali, and a certain amount of sodium carbonate can be deposited inside the equipment after the equipment runs for a period of time, so that the sodium carbonate inside the equipment needs to be cleaned after the equipment runs for a period of time to obtain a sodium carbonate solution.
In this embodiment, the sodium aluminate washing solution is obtained from a bayer process decomposition process, and specifically, aluminum hydroxide seed crystals are added to the sodium aluminate solution obtained by the two-stage dissolution process to gradually precipitate aluminum hydroxide crystals, and the precipitated aluminum hydroxide crystals are washed by a filter to obtain a sodium aluminate washing solution, which contains a large amount of organic substances, such as oxalate.
The method is characterized in that a plate-and-frame filter press is adopted to compress Bayer process red mud, so that the red mud with low moisture content can be obtained, so that sodium aluminate washing liquor (with high moisture content) can be additionally introduced into the red mud to prepare raw slurry for sintering, the raw slurry is sintered while organic matters in the sodium aluminate washing liquor are burned, and simultaneously intermediate product clinker is produced.
Example 2 is substantially as shown in figure 1:
the difference from example 1 is that: this embodiment has improved the filter-pressing subassembly among the plate and frame filter press, further reduces the moisture in the red mud after filtering through the mode that increases the filter chamber space in the plate and frame filter press and increase pressure, specifically as follows:
the filter pressing assembly comprises a filter frame 10, filter cloth and a filter plate, the filter cloth is fixed on the filter plate, the vertical cross section of the filter frame 10 is I-shaped, a compression cavity is formed between the two sides of the filter frame 10 and the filter cloth, a feed inlet 11 communicated with the compression cavity is formed in the filter frame 10, a cavity 12 is formed in the middle of the filter frame 10, mounting grooves are respectively formed in two side walls of the cavity 12, an elastic layer 13 is fixed in each mounting groove, and a control mechanism for controlling the elastic layer 13 to deform is arranged in each cavity 12.
Wherein control mechanism is including fixing the hollow plate 14 in cavity 12, and hollow plate 14 top intercommunication has the inlet pipe 15 that runs through filter frame 10 top, and inlet pipe 15 is connected with the delivery pump, has the discharging pipe 16 that runs through filter frame 10 bottom at hollow plate 14's bottom intercommunication, and discharging pipe 16 is connected with the row and expects the pump, and the equipartition has a plurality of through-holes 17 on hollow plate 14's curb plate, still is fixed with a plurality of elastic components between hollow plate 14 and the elastic layer 13, adopts spring 18 in this embodiment.
When the red mud is subjected to filter pressing, the red mud is pumped into the filter frame 10 from the feed inlet 11, the red mud entering the filter frame 10 is mutually extruded, the filtrate is discharged through the filter cloth and the filter plate, the compressed red mud is remained in the filter frame 10, meanwhile, the non-Newtonian fluid is pumped into the hollow plate 14 through the material conveying pump at the pumping speed of V1, the non-Newtonian fluid in the hollow plate 14 is pumped out by the discharging pump at the pumping speed of V2, when the red mud is subjected to filter pressing, V1 is controlled to be more than V2, so that the non-Newtonian fluid is discharged out of the hollow plate 14 through the through hole 17, the elastic layer 13 is extruded, and meanwhile, the elastic layer 13 is extruded by the non-Newtonian fluid, and the red mud becomes hard after being stressed, so that the red mud can generate extrusion force, and the water in the red mud is further reduced.
After filter pressing is completed, the filter plates in the filter pressing assembly are separated from the filter frame 10, the extrusion effect of the red mud on the elastic layer 13 is weakened, and V1 is controlled to be not more than V2, so that non-Newtonian fluid in contact with the elastic layer 13 enters the hollow plate 14 and is discharged under the action of the discharge pump, and the volume of the material frame is enlarged.
Experiments prove that the moisture content of the red mud compressed by the improved plate-and-frame filter press is reduced by about 30%, and more sodium aluminate washing liquor can be added under the condition of reducing the moisture content of the red mud, so that more sodium aluminate washing liquor can be treated in the sintering process of the red mud, and great economic benefit is brought to enterprises.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A Bayer process red mud concentration process suitable for sintering process production is characterized in that: filtering the Bayer process red mud by using a filter press, wherein the water content of the filtered red mud is not more than 30%; adding a sodium carbonate solution and a sodium aluminate washing solution into the filtered red mud, grinding the mixture by using a mill to prepare red mud slurry, and blending the red mud slurry to obtain raw slurry; pumping the raw slurry into a sintering kiln for sintering, wherein the sodium aluminate washing liquid is a solution generated by aluminum hydroxide crystals in a Bayer process decomposition process; the filter press is a plate-and-frame filter press, a filter pressing assembly of the plate-and-frame filter press comprises a filter frame, filter cloth and a filter plate, the filter cloth is fixed on the filter plate, the vertical section of the filter frame is I-shaped, a compression cavity is formed between two sides of the filter frame and the filter cloth, a feed inlet communicated with the compression cavity is formed in the filter frame, a cavity is formed in the middle of the filter frame, mounting grooves are respectively formed in two side walls of the cavity, an elastic layer is fixed in each mounting groove, and a control mechanism for controlling the elastic layer to deform is arranged in each cavity; the control mechanism comprises a hollow plate fixed in the cavity, the top of the hollow plate is communicated with a feed pipe penetrating through the top of the filter frame, the feed pipe is connected with a feed delivery pump, the bottom of the hollow plate is communicated with a discharge pipe penetrating through the bottom of the filter frame, the discharge pipe is connected with a discharge pump, a plurality of through holes are uniformly distributed on a side plate of the hollow plate, and a plurality of elastic elements are fixed between the hollow plate and the elastic layer;
when the red mud is subjected to filter pressing, the red mud is pumped into a filter frame from a feed inlet, the red mud entering the filter frame is mutually extruded, filtrate is discharged through a filter cloth and a filter plate, the compressed red mud is remained in the filter frame, meanwhile, a non-Newtonian fluid is pumped into a hollow plate through a delivery pump, the pumping speed is V1, the non-Newtonian fluid in the hollow plate is pumped out by a discharge pump, the pumping speed is V2, when the red mud is subjected to filter pressing, V1 is controlled to be more than V2, so that the non-Newtonian fluid is discharged out of the hollow plate through a through hole, an elastic layer is extruded, the red mud is also extruded on the elastic layer, and the non-Newtonian fluid is hardened after being stressed, so that the red mud can generate extrusion force on the red mud, and the water in the red mud is further reduced;
after filter pressing is completed, the filter plate and the filter frame in the filter pressing assembly are separated, the extrusion effect of the red mud on the elastic layer is weakened, and V2 is controlled to be not less than V1, so that non-Newtonian fluid contacting with the elastic layer enters the hollow plate and is discharged under the action of the discharge pump, and the volume of the material frame is enlarged.
2. The Bayer process red mud concentration process applicable to sintering process production according to claim 1, characterized in that: the sodium carbonate solution is sodium carbonate deposited in each device used in the Bayer process.
3. The Bayer process red mud concentration process applicable to sintering process production according to claim 1, characterized in that: the moisture of the raw slurry is 38-41%.
4. The Bayer process red mud concentration process applicable to sintering process production according to claim 1, characterized in that: the grinding by the mill is to mix the red mud with sodium carbonate solution and sodium aluminate washing liquor by an overflow type mill and grind the mixture into red mud slurry.
5. The Bayer process red mud concentration process applicable to sintering process production according to claim 1, characterized in that: the raw slurry is prepared by mixing ground red mud slurry with limestone, coal and soda ash.
6. The Bayer process red mud concentration process applicable to sintering process production according to claim 1, characterized in that: the raw slurry is calcined in a sintering kiln, so that organic matters can be burned and intermediate product clinker is generated.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1018355A2 (en) * | 1999-01-08 | 2000-07-12 | United States Filter Corporation | Flow control sensor and method for filling of a filter press |
| CN106178630A (en) * | 2016-08-19 | 2016-12-07 | 上海溪昌环境工程有限公司 | A kind of novel elastic filter press being aided with elastomer |
| CN110028091A (en) * | 2018-05-31 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of Bayer process red mud production aluminium oxide wet laid furnishes dry sintering technique |
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2020
- 2020-04-15 CN CN202010297018.8A patent/CN111484222B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1018355A2 (en) * | 1999-01-08 | 2000-07-12 | United States Filter Corporation | Flow control sensor and method for filling of a filter press |
| CN106178630A (en) * | 2016-08-19 | 2016-12-07 | 上海溪昌环境工程有限公司 | A kind of novel elastic filter press being aided with elastomer |
| CN110028091A (en) * | 2018-05-31 | 2019-07-19 | 沈阳铝镁设计研究院有限公司 | A kind of Bayer process red mud production aluminium oxide wet laid furnishes dry sintering technique |
Non-Patent Citations (1)
| Title |
|---|
| 铝土矿中有机物对拜耳法生产的影响及对策;陆玉等;《山东冶金》;20180630;第18-19页 * |
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