CN103266525B - A kind of silicon removing method of straw pulp black liquor - Google Patents
A kind of silicon removing method of straw pulp black liquor Download PDFInfo
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- CN103266525B CN103266525B CN201310214390.8A CN201310214390A CN103266525B CN 103266525 B CN103266525 B CN 103266525B CN 201310214390 A CN201310214390 A CN 201310214390A CN 103266525 B CN103266525 B CN 103266525B
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- black liquor
- straw pulp
- body refuse
- silicon
- centrifuge
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Abstract
The invention discloses a kind of silicon removing method of straw pulp black liquor, comprise following operation: straw pulp black liquor is delivered in disk plate centrifuge and carried out centrifugal treating by (1), obtains the first Clear black liquor and siliceous body refuse; (2) described siliceous body refuse sent into dreg collecting slot and added hot water, forming siliceous body refuse suspension; (3) described siliceous body refuse suspension is delivered in the first horizontal screw centrifuge carry out centrifugal treating, obtain the second Clear black liquor and silicon-containing waste residue, described second Clear black liquor is delivered in described disk plate centrifuge and carries out processing until wherein SiO
2content is less than 0.5g/L.Straw pulp black liquor silicon removing method of the present invention does not use by the interpolation of desiliconizing agent, and through physical treatment method, can not bring and disturb the secondary of black liquor subsequent treatment, and silica removal process is simple and direct; Black liquor after silica removal can ensure that the silicon obstacle problem of black liquor alkali collection is eliminated substantially; Black liquor after silica removal all has important improvement in viscosity, thermal expansion character, relatively the numerical value of pulp black liquor.
Description
Technical field
The present invention relates to field of papermaking, particularly relate to a kind of silicon removing method of straw pulp black liquor.
Background technology
Utilize the technique of grass as raw material slurrying to be a mature technology, what the industry of restriction papermaking straw pulp was produced is removal and the alkali collection of silicon in black liquor.If the SiO in black liquor effectively can not be removed
2and silicon-containing compound, can scale formation be produced in Black Liquor Concentration evaporimeter, cause the evaporimeter thermal efficiency to decline, and the residue of silicon makes again white liquid clarity reduce in causticization operation, affects alkali collection quality.
The structure of silicon is glassy, and general soda acid is difficult to remove, and current existing straw pulp black liquor silicon removing method mainly contains: in black liquor, add CaO, is precipitated out by part silicon, but CaO add and to concentration evaporator add scale removal burden; Also have by by high concentration CO
2inject black liquor and make SiO
2the method of precipitation, but this method will consume too much CO
2, increase production cost; Also have and add antisludging agent to protect evaporimeter in black liquor, effect is also undesirable, and production cost also can improve.
Therefore, a kind of, the method that can cost-effectively remove silicon in straw pulp black liquor simple desirable to provide technique.
Summary of the invention
For this reason, the invention provides a kind of silicon removing method of the new straw pulp black liquor at least partially that at least can solve the problem.
The invention provides a kind of silicon removing method of straw pulp black liquor, comprise following operation: straw pulp black liquor is delivered in disk plate centrifuge and carried out centrifugal treating by (1), obtains the first Clear black liquor and siliceous body refuse; (2) described siliceous body refuse sent into dreg collecting slot and added hot water, forming siliceous body refuse suspension; (3) described siliceous body refuse suspension is delivered in the first horizontal screw centrifuge carry out centrifugal treating, obtain the second Clear black liquor and silicon-containing waste residue, described second Clear black liquor is delivered in described disk plate centrifuge and carries out processing until wherein SiO
2content is less than 0.5g/L.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, before described straw pulp black liquor is delivered to disk plate centrifuge, described straw pulp black liquor is carried out settlement treatment, after sedimentation completes, obtain supernatant liquor and settled layer.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, the time of described settlement treatment is 4-16h.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, described silicon removing method comprises described settled layer to deliver in the second horizontal screw centrifuge further and carries out centrifugal treating, centrifugal complete after obtain the 3rd Clear black liquor and siliceous body refuse.
Alternatively, the silicon removing method of straw pulp black liquor of the present invention, the concentration of described siliceous body refuse suspension is 10-15%.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, SiO in described straw pulp black liquor
2content be 1-8g/L.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, the separation factor of described disk plate centrifuge is 7000-12000, and the separation factor of described first horizontal screw centrifuge and the second horizontal screw centrifuge is 2000-4000.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, described disk plate centrifuge, the first horizontal screw centrifuge and the second horizontal screw centrifuge all adopt stainless steel or carbon steel to make.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, be used for carrying the pump of black liquor and pipeline all to adopt stainless steel or carbon steel to make.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, described straw pulp comprises rice straw pulp, Straw Pulp, reed pulp, bagasse pulp.
Compared with prior art, the beneficial effect of the silicon removing method of straw pulp black liquor of the present invention is: the interpolation not by desiliconizing agent uses, and through physical treatment method, can not bring and disturb the secondary of black liquor subsequent treatment, and silica removal process is simple and direct; Black liquor after silica removal can ensure that the silicon obstacle problem of black liquor alkali collection is eliminated substantially; Black liquor after silica removal all has important improvement in viscosity, thermal expansion character, relatively the numerical value of pulp black liquor.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred embodiment, and does not think limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of straw pulp black liquor silicon removing method in one embodiment of the invention; And
Fig. 2 is the schematic flow sheet of straw pulp black liquor silicon removing method in another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and concrete embodiment, the invention will be further described.
Fig. 1 illustrates the schematic flow sheet of silicon removing method described in one embodiment of the invention.As shown in Figure 1, in the silicon removing method of straw pulp black liquor of the present invention, first the straw pulp black liquor after slurrying is delivered in disk plate centrifuge, by obtaining the first Clear black liquor and siliceous body refuse after centrifugal treating.SiO in the first Clear black liquor obtained
2content be less than 0.5g/L, this part Clear black liquor can directly be delivered to evaporation concentrator and concentrate.Owing to still containing a large amount of organic matters and alkali in described siliceous body refuse, also need to be further processed it.In the present invention, the siliceous body refuse obtained is delivered in dreg collecting slot, in dreg collecting slot, add hot water described siliceous body refuse is diluted, form the suspension of siliceous body refuse.The concentration of described siliceous body refuse suspension is preferably 10-15%.Siliceous body refuse suspension is delivered in the first horizontal screw centrifuge and carries out centrifugal treating, the second Clear black liquor obtained and silicon-containing waste residue.The silicon-containing waste residue obtained can discharge after treatment, and the second Clear black liquor obtained can according to wherein SiO
2content does different disposal, if wherein SiO
2content is less than 0.5g/L, directly delivers to evaporimeter and concentrates, if wherein SiO
2content is greater than 0.5g/L, then delivered in disk plate centrifuge and again process, until SiO wherein
2content is less than 0.5g/L.
In the present invention, described disk plate centrifuge is the one of vertical centrifugal machine, and rotary drum is contained in vertical shaft upper end, is driven and High Rotation Speed by motor by transmission device.One group of dish-shaped part--video disc be nested in mutually is together had in rotary drum.The settling height of solid particle (or drop), the settling area of expansion rotary drum are shortened in the effect of video disc, substantially increase the production capacity of seperator in rotary drum owing to having installed video disc.The separation factor of the disc separator used in the present invention is 7000-12000, and separation characteristic is that rotating speed is fast, can by SiO
2silicon in the black liquor that content is lower is separated, and be separated the Clear black liquor obtained and directly can send evaporimeter, siliceous body refuse is then sent in dreg collecting slot and is further processed.In the present invention, carbon steel or stainless pump and pipeline is adopted to carry black liquor.
In the present invention, described horizontal screw centrifuge is the precipitation apparatus of a kind of horizontal screw unloading, continued operation, is applicable to being separated being greater than 0.005mm containing solid formation granularity, and concentration range is the suspension of 2-40%.The separation factor of the Horizontal helical type centrifuge used in the present invention is 2000-4000, and comparatively disk plate centrifuge rotating speed is slow, mainly for the treatment of SiO
2the black liquor that content is higher.
Before described straw pulp black liquor is delivered to disk plate centrifuge, first described straw pulp black liquor can also be carried out settlement treatment.Fig. 2 shows the schematic flow sheet of straw pulp black liquor silicon removing method in another embodiment of the present invention.As shown in Figure 2, first the black liquor after slurrying is carried out natural subsidence in stillpot, after sedimentation a period of time, form the layering of supernatant liquor and lower floor's settled layer.The described sedimentation time is preferably 4-16h.In the present invention, the silicon content of described straw pulp black liquor is 1-8g/L, in infall process, due to Action of Gravity Field, and the SiO of the overwhelming majority in black liquor
2be sunken in lower floor's settled layer, therefore SiO in supernatant liquor
2content is less than 0.5g/L, can directly send evaporimeter to concentrate, and SiO in lower floor's settled layer
2content is higher, such as, rice straw black liquor or wheat straw black liquor after sedimentation, the SiO in settled layer
2content can reach 10-16g/L, need carry out subsequent treatment to this settled layer.Because wherein SiO
2content is higher, is carried out centrifugal treating so deliver in the second horizontal screw centrifuge.SiO in the black liquor obtained after centrifugal treating completes
2content is generally also higher, can deliver in disk plate centrifuge and be further processed.The Clear black liquor obtained after disk plate centrifuge process can be delivered in evaporimeter and concentrate, and the siliceous body refuse obtained is sent in dreg collecting slot, adds hot water and forms the siliceous body refuse suspension that concentration is preferably 10-15%.Described siliceous body refuse suspension is delivered in the first horizontal screw centrifuge and processes, process the Clear black liquor and silicon-containing waste residue that obtain.Silicon-containing waste residue discharges after treatment, and Clear black liquor can according to wherein SiO
2content does different disposal, if wherein SiO
2content is less than 0.5g/L, directly delivers to evaporimeter and concentrates, if wherein SiO
2content is greater than 0.5g/L, then delivered in disk plate centrifuge and again process, until SiO wherein
2content is less than 0.5g/L.Be understandable that, if SiO in straw pulp black liquor
2content is less, after settlement treatment, and SiO in settled layer
2content is also on the low side, then directly the settled layer disk plate centrifuge obtained can be carried out centrifugal treating.
In the present invention, adopt disk plate centrifuge and horizontal screw centrifuge two kinds of centrifuges to containing SiO
2black liquor carry out alternately separating treatment, by high speed centrifugation process, silicon is removed.Black liquor SiO before process
2content is 1-8g/L, the SiO after centrifugation
2content drops to below 0.5g/L; Thermal volume expansion reaches 18-23ml/g, and in black liquor, solid concentration reaches 55%; During temperature 100 DEG C, black liquor viscosity reaches about 32mPa.S.Effective removal of silicon in black liquor, eliminates the phenomenon of fouling of evaporator, also eliminates the silicon obstacle problem of follow-up causticization operation, be beneficial to the generation of green liquor in lower road alkali causticization operation, ensure white liquid quality, improve alkali recovery efficiency.
Silicon removing method of the present invention is applicable to the black liquor that the straw pulps such as rice straw pulp, Straw Pulp, reed pulp, bagasse pulp extract.
More according to the optional element of the straw pulp black liquor silicon removing method of the present invention's proposition, can design various embodiments, therefore specific embodiment is only as the exemplary illustration of specific implementation of the present invention, and does not form limitation of the scope of the invention.In order to concrete description the present invention, following examples are selected to carry out exemplary illustration.
Embodiment 1
The black liquor extracted by rice straw pulp is placed in subsider natural subsidence 16 hours, forms supernatant liquor and lower floor's settled layer.The SiO of described supernatant liquor
2content is below 0.5g/L, is sent evaporimeter concentration.SiO in lower floor's settled layer
2content is 13g/L, is delivered in the second Horizontal helical type centrifuge and processes.The Clear black liquor obtained after process is delivered in disk plate centrifuge and is processed, and the siliceous body refuse obtained is sent in dreg collecting slot.Clear black liquor obtains clarified solution and can deliver to evaporimeter and concentrate after disk plate centrifuge process, and the siliceous body refuse obtained also is delivered in dreg collecting slot.In dreg collecting slot, add hot water, form the siliceous body refuse suspension that concentration is 10%, this suspension is delivered to the first horizontal screw centrifuge and processes.The Clear black liquor obtained after separating treatment is sent disk plate centrifuge back to and is separated, and the silicon-containing waste residue of the weakly acidic pH obtained is treated drains.The conveying of black liquor adopts carbon steel or stainless steel pump and Cemented filling.
Silica removal treatment effect: SiO in rice straw black liquor before process
2content is 6.8g/L, through sedimentation and centrifugal after Clear black liquor SiO
2content is all at below 0.5g/L, and the silica removal rate of rice straw black liquor is 94%.
Embodiment 2
The black liquor extracted by bagasse pulp to be put in subsider natural subsidence 4 hours, forms supernatant liquor and lower floor's settled layer.Described upper strata black liquor SiO
2content is below 0.5g/L, is sent evaporimeter concentration.SiO in lower floor's settled layer
2content is 9g/L, is delivered to the second Horizontal helical type centrifuge kind and processes.The Clear black liquor obtained after process is delivered in disk plate centrifuge and is processed, and the siliceous body refuse obtained is sent in dreg collecting slot.Clear black liquor obtains clarified solution and can deliver to evaporimeter and concentrate after disk plate centrifuge process, and the siliceous body refuse obtained also is delivered in dreg collecting slot.In dreg collecting slot, add hot water, form the siliceous body refuse suspension that concentration is 15%, this suspension is delivered to the first horizontal screw centrifuge and processes.The Clear black liquor obtained after separating treatment is sent disk plate centrifuge back to and is separated, and the silicon-containing waste residue of the weakly acidic pH obtained is treated drains.The conveying of black liquor adopts carbon steel or stainless steel pump and Cemented filling.
Silica removal treatment effect: bagasse black liquor SiO before process
2content is 1.7g/L, through sedimentation and centrifugal after Clear black liquor SiO
2content is all at below 0.5g/L, and the silica removal rate of bagasse black liquor is 74%.
Embodiment 3
Black liquor Straw Pulp extracted directly pumps into disk plate centrifuge and processes, and the clear liquid that separation obtains is sent to evaporimeter and concentrates, and is separated the siliceous body refuse obtained and delivers in dreg collecting slot, in dreg collecting slot, add hot water, forms the siliceous body refuse suspension that concentration is 12%.Pumped in the first horizontal screw centrifuge by this suspension and process, the Clear black liquor that centrifugation obtains is sent disk plate centrifuge back to and is separated, and the wet weakly acidic pH silicon-containing waste residue obtained can go back to field.
Silica removal treatment effect: wheat straw black liquor SiO before process
2content is 3.6g/L, the Clear black liquor SiO after centrifugal
2content is all at below 0.5g/L, and the silica removal rate of wheat straw black liquor is 90%.
Embodiment 4
The black liquor extracted by reed pulp directly pumps into disk plate centrifuge and processes, and the clear liquid that separation obtains is sent to evaporimeter and concentrates, and is separated the siliceous body refuse obtained and delivers in dreg collecting slot, in dreg collecting slot, add hot water, forms the siliceous body refuse suspension that concentration is 14%.Pumped in the first horizontal screw centrifuge by this suspension and process, the Clear black liquor that centrifugation obtains is delivered to evaporimeter and is concentrated, and the wet weakly acidic pH silicon-containing waste residue obtained can go back to field.
Silica removal treatment effect: reed pulp black liquor SiO before process
2content is 2.1g/L, the Clear black liquor SiO after centrifugal
2content is all at below 0.5g/L, and the silica removal rate of reed pulp black liquor is 81%.
It should be noted, the present invention will be described instead of limit the invention for above-described embodiment, and those skilled in the art can design alternative embodiment when not departing from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and does not arrange element in the claims or step.Word first, second and third-class use do not represent any order, can be title by these word explanations.
Claims (4)
1. a silicon removing method for straw pulp black liquor, comprises following operation:
(1) straw pulp black liquor is delivered in disk plate centrifuge carry out centrifugal treating, obtain the first Clear black liquor and siliceous body refuse;
(2) described siliceous body refuse sent into dreg collecting slot and added hot water, forming siliceous body refuse suspension;
(3) described siliceous body refuse suspension is delivered in the first horizontal screw centrifuge carry out centrifugal treating, obtain the second Clear black liquor and silicon-containing waste residue, described second Clear black liquor is delivered in described disk plate centrifuge and carries out processing until wherein SiO
2content is less than 0.5g/L;
Wherein, before described straw pulp black liquor is delivered to disk plate centrifuge, described straw pulp black liquor is carried out settlement treatment, obtain supernatant liquor and settled layer after sedimentation completes, the time of described settlement treatment is 4-16h;
Wherein, described silicon removing method comprises described settled layer to deliver in the second horizontal screw centrifuge further and carries out centrifugal treating, centrifugal complete after obtain the 3rd Clear black liquor and siliceous body refuse;
Wherein, the concentration of described siliceous body refuse suspension is 10-15%, SiO in described straw pulp black liquor
2content is 1-8g/L;
Wherein, the separation factor of described disk plate centrifuge is 7000-12000, and the separation factor of described first horizontal screw centrifuge and the second horizontal screw centrifuge is 2000-4000.
2. silicon removing method according to claim 1, is characterized in that: described disk plate centrifuge, the first horizontal screw centrifuge and the second horizontal screw centrifuge all adopt stainless steel or carbon steel to make.
3. silicon removing method according to claim 1, is characterized in that: be used for carrying the pump of black liquor and pipeline all to adopt stainless steel or carbon steel to make.
4. silicon removing method according to claim 1, is characterized in that: described straw pulp comprises rice straw pulp, Straw Pulp, reed pulp, bagasse pulp.
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| CN201310214390.8A CN103266525B (en) | 2013-06-03 | 2013-06-03 | A kind of silicon removing method of straw pulp black liquor |
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| CN201310214390.8A CN103266525B (en) | 2013-06-03 | 2013-06-03 | A kind of silicon removing method of straw pulp black liquor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331507A (en) * | 1979-12-10 | 1982-05-25 | Dorr-Oliver Incorporated | Desilication in alkaline pulp processes |
| CN87104742A (en) * | 1986-06-11 | 1988-03-23 | 法国技术研究与制造公司 | The method and system of from pulp mill's residual black, separating contained silica |
| CN1067080A (en) * | 1992-04-15 | 1992-12-16 | 汪仲熙 | The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp |
| CN102041703A (en) * | 2010-12-02 | 2011-05-04 | 陕西科技大学 | Process for removing silicon in green liquor of papermaking alkali recovery section by seeding |
| CN102641602A (en) * | 2011-02-18 | 2012-08-22 | 上智企业有限公司 | Multiple-effect evaporator system |
-
2013
- 2013-06-03 CN CN201310214390.8A patent/CN103266525B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331507A (en) * | 1979-12-10 | 1982-05-25 | Dorr-Oliver Incorporated | Desilication in alkaline pulp processes |
| CN87104742A (en) * | 1986-06-11 | 1988-03-23 | 法国技术研究与制造公司 | The method and system of from pulp mill's residual black, separating contained silica |
| CN1067080A (en) * | 1992-04-15 | 1992-12-16 | 汪仲熙 | The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp |
| CN102041703A (en) * | 2010-12-02 | 2011-05-04 | 陕西科技大学 | Process for removing silicon in green liquor of papermaking alkali recovery section by seeding |
| CN102641602A (en) * | 2011-02-18 | 2012-08-22 | 上智企业有限公司 | Multiple-effect evaporator system |
Non-Patent Citations (1)
| Title |
|---|
| 减少草浆黑液在蒸发器结垢的途径;黎明芳;《中国造纸》;19831231(第6期);第57-58页 * |
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