CN103266525A - Silica removing method for straw pulp black liquor - Google Patents
Silica removing method for straw pulp black liquor Download PDFInfo
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- CN103266525A CN103266525A CN2013102143908A CN201310214390A CN103266525A CN 103266525 A CN103266525 A CN 103266525A CN 2013102143908 A CN2013102143908 A CN 2013102143908A CN 201310214390 A CN201310214390 A CN 201310214390A CN 103266525 A CN103266525 A CN 103266525A
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- black liquor
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Abstract
The invention discloses a silica removing method for straw pulp black liquor. The silica removing method for the straw pulp black liquor comprises the following steps that (1) the straw pulp black liquor is delivered to a disc centrifugal machine, so that centrifugal processing is conducted and first clean black liquor and sludge containing silica are obtained; (2) the sludge containing the silica is delivered into a sludge collecting tank and hot water is added into the sludge collecting tank, so that sludge suspension liquid containing the silica is formed; (3) the sludge suspension liquid containing the silica is delivered to a first horizontal spiral centrifugal machine for centrifugal processing, so that second clean black liquor and waste residue containing the silica are obtained, and the second clean black liquor is delivered into the disc centrifugal machine to be processed until the content of the SiO2 in the second clean black liquor is less than 0.5g/L. According to the silica removing method for the straw pulp black liquor, no silica removing agent is added and used, a physical processing method is adopted, so that secondary interference to the following processing of the black liquor is not caused, and a silica removing process is simple; the black liquor after the silica is removed guarantees that the problem of silica interference in alkali recovery of the black liquor is solved fundamentally; the black liquor after the silica is removed has important improvement in the characteristic aspects of both viscosity and thermal expansion, and the values of the viscosity and the thermal expansion are close to those of wood pulp black liquor.
Description
Technical field
The present invention relates to field of papermaking, relate in particular to a kind of silicon removing method of straw pulp black liquor.
Background technology
The technology of utilizing grass as raw material slurrying has been a mature technology, and what the industry of restriction papermaking straw pulp was produced is removal and the alkali recovery of silicon in the black liquor.If can not effectively remove the SiO in the black liquor
2And silicon-containing compound, in the black liquor concentration evaporator, can produce scale formation, cause the evaporimeter thermal efficiency to descend, and the residue of silicon make white liquid clarity reduce again in the causticization operation, influence alkali recovery quality.
The structure of silicon is glassy, and general soda acid is difficult to remove, and present existing straw pulp black liquor silicon removing method mainly contains: add CaO in black liquor, part silicon is precipitated out, but the adding of CaO has increased the scale removal burden to concentration evaporator again; Also have and pass through 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 to add antisludging agent protect evaporimeter in black liquor, effect is also undesirable, and production cost also can improve.
Therefore, be desirable to provide the method that a kind of technology is simple, can remove the silicon in the straw pulp black liquor cost-effectively.
Summary of the invention
For this reason, the invention provides a kind of silicon removing method of new straw pulp black liquor of at least a portion that can address the above problem at least.
The invention provides a kind of silicon removing method of straw pulp black liquor, comprise following operation: (1) is delivered to straw pulp black liquor and is carried out centrifugal treating in the disk plate centrifuge, obtains first clear black liquor and the siliceous body refuse; (2) described siliceous body refuse is sent into dreg collecting slot and added hot water, form siliceous body refuse suspension; (3) described siliceous body refuse suspension is delivered to carried out centrifugal treating in first horizontal screw centrifuge, obtain second clear black liquor and the siliceous waste residue, the described second clear black liquor is delivered to handled in the described disk plate centrifuge until SiO wherein
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 sedimentation handle, obtain supernatant liquor and settled layer after sedimentation is finished.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, the time that described sedimentation is handled is 4-16h.
Alternatively, according to the silicon removing method of straw pulp black liquor of the present invention, described silicon removing method further comprises described settled layer delivered to and carries out centrifugal treating in second horizontal screw centrifuge, obtains the 3rd clear black liquor and siliceous body refuse after centrifugal the finishing.
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 the 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 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, first horizontal screw centrifuge and 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: do not use by the interpolation of desiliconizing agent, and through the physical treatment method, can not bring the secondary to the black liquor subsequent treatment to disturb, the silica removal process is simple and direct; Black liquor behind silica removal can guarantee that the silicon interference problem that black liquor alkali reclaims eliminates substantially; Black liquor behind the silica removal is all having important improvement aspect viscosity, the thermal expansion character, relatively near the numerical value of pulp black liquor.
Description of drawings
By reading hereinafter detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing only is used for the purpose of preferred embodiment is shown, 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 the one embodiment of the invention; And
Fig. 2 is the schematic flow sheet of straw pulp black liquor silicon removing method in the another embodiment of the present invention.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and concrete embodiment.
Fig. 1 illustrates the schematic flow sheet of silicon removing method described in the one embodiment of the invention.As shown in Figure 1, in the silicon removing method of straw pulp black liquor of the present invention, at first the straw pulp black liquor after the slurrying is delivered in the disk plate centrifuge, by obtaining first clear black liquor and the siliceous body refuse after the centrifugal treating.SiO in the first clear black liquor that obtains
2Content less than 0.5g/L, the clear black liquor of this part can directly be delivered to evaporation concentrator and concentrate.Owing to still contain a large amount of organic matters and alkali in the described siliceous body refuse, also need it is further processed.Among the present invention, the siliceous body refuse that obtains is delivered in the dreg collecting slot, added hot water in the dreg collecting slot 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 delivered to carry out centrifugal treating in first horizontal screw centrifuge, second clear black liquor and the siliceous waste residue that obtains.Resulting siliceous waste residue can discharge after treatment, and the resulting second clear black liquor can be according to SiO wherein
2Content is done different disposal, if SiO wherein
2Content is less than 0.5g/L, directly delivers to evaporimeter and concentrates, if SiO wherein
2Content is then delivered to it in disk plate centrifuge and is handled again, until SiO wherein greater than 0.5g/L
2Content is less than 0.5g/L.
Among the present invention, described disk plate centrifuge is a kind of of vertical centrifugal machine, and rotary drum is contained in the vertical shaft upper end, by transmission device rotation at a high speed by Motor Drive.One group of dish-shaped part--video disc that is nested in is mutually together arranged in the rotary drum.The effect of video disc is the settling height that shortens solid particle (or drop), the settling area that enlarges rotary drum, has improved the production capacity of seperator in the rotary drum greatly because video disc has been installed.The separation factor of employed disc separator is 7000-12000 among the present invention, and separation characteristic is that rotating speed is fast, can be with SiO
2Silicon in the lower black liquor of content is separated, and separates the clear black liquor that obtains and can directly send evaporimeter, and siliceous body refuse then is sent in the dreg collecting slot and is further processed.Among the present invention, adopt carbon steel or stainless pump and pipeline to carry black liquor.
Among the present invention, described horizontal screw centrifuge is the precipitation apparatus of a kind of horizontal screw unloading, continued operation, and suitable separation contains the solid formation granularity greater than 0.005mm, and concentration range is the suspension of 2-40%.The separation factor of employed horizontal helical type centrifuge is 2000-4000 among the present invention, and is slow than the disk plate centrifuge rotating speed, 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, can also at first described straw pulp black liquor be carried out sedimentation and handle.Fig. 2 shows the schematic flow sheet of straw pulp black liquor silicon removing method in the another embodiment of the present invention.As shown in Figure 2, earlier the black liquor after the 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.Among the present invention, the silicon content of described straw pulp black liquor is 1-8g/L, in the infall process, since the gravity effect, the SiO of the overwhelming majority in the black liquor
2Be sunken in lower floor's settled layer, so SiO in the supernatant liquor
2Content can directly send evaporimeter to concentrate less than 0.5g/L, and SiO in lower floor's settled layer
2Content is higher, for example, rice straw black liquor or wheat straw black liquor after sedimentation, the SiO in the settled layer
2Content can reach 10-16g/L, needs this settled layer is carried out subsequent treatment.Because SiO wherein
2Content is higher, carries out centrifugal treating in second horizontal screw centrifuge so it is delivered to.SiO in the black liquor that obtains after centrifugal treating is finished
2Content is general also higher, can deliver in the disk plate centrifuge to be further processed.The clear black liquor that disk plate centrifuge obtains after handling can be delivered in the evaporimeter and concentrate, and the siliceous body refuse that obtains is sent in the dreg collecting slot, adds hot water and forms the siliceous body refuse suspension that concentration is preferably 10-15%.Described siliceous body refuse suspension delivered in first horizontal screw centrifuge handle, handle the clear black liquor and the siliceous waste residue that obtain.Siliceous waste residue discharges after treatment, and clear black liquor can be according to SiO wherein
2Content is done different disposal, if SiO wherein
2Content is less than 0.5g/L, directly delivers to evaporimeter and concentrates, if SiO wherein
2Content is then delivered to it in disk plate centrifuge and is handled again, until SiO wherein greater than 0.5g/L
2Content is less than 0.5g/L.Be understandable that, if SiO in the straw pulp black liquor
2Content is less, after handling through sedimentation, and SiO in the settled layer
2Content is also on the low side, then can directly the settled layer that obtains be carried out centrifugal treating with disk plate centrifuge.
Among the present invention, adopt disk plate centrifuge and two kinds of centrifuges of horizontal screw centrifuge to containing SiO
2Black liquor replace separating treatment, handle by high speed centrifugation silicon removed.Black liquor SiO before handling
2Content is 1-8g/L, the SiO after centrifugation
2Content drops to below the 0.5g/L; Thermal volume expansion reaches 18-23ml/g, and solid concentration reaches 55% in the black liquor; During 100 ℃ of temperature, black liquor viscosity reaches about 32mPa.S.The phenomenon of fouling of evaporator is eliminated in effective removal of silicon in the black liquor, has also eliminated the silicon interference problem of follow-up causticization operation, is beneficial to down the generation of green liquor in the road alkali causticization operation, guarantees white liquid quality, has improved alkali recovery efficiency.
Silicon removing method of the present invention is applicable to the black liquor that straw pulps such as rice straw pulp, Straw Pulp, reed pulp, bagasse pulp extract.
The optional factor of the straw pulp black liquor silicon removing method that proposes according to the present invention is more, can design various embodiments, so specific embodiment is only as the exemplary illustration of specific implementation of the present invention, and does not constitute limitation of the scope of the invention.For concrete description the present invention, select following examples to carry out exemplary illustration.
Embodiment 1
The black liquor that rice straw pulp is extracted placed the subsider natural subsidence 16 hours, formed supernatant liquor and lower floor's settled layer.The SiO of described supernatant liquor
2Content is below the 0.5g/L, send the evaporimeter concentration to get final product it.SiO in lower floor's settled layer
2Content is 13g/L, it is delivered in the second horizontal helical type centrifuge handle.The clear black liquor that obtains after the processing is delivered in the disk plate centrifuge and is handled, and the siliceous body refuse that obtains is sent in the dreg collecting slot.Clear black liquor obtains clarified solution and can deliver to evaporimeter and concentrate after disk plate centrifuge is handled, the siliceous body refuse that obtains is also delivered in the dreg collecting slot.Add hot water in dreg collecting slot, formation concentration is 10% siliceous body refuse suspension, this suspension is delivered to first horizontal screw centrifuge handle.Send disk plate centrifuge back to through the clear black liquor that obtains after the separating treatment and separate treated the draining of siliceous waste residue of the nearly neutrality that obtains.The conveying of black liquor adopts carbon steel or stainless steel pump and pipeline to carry.
Silica removal treatment effect: SiO in the rice straw black liquor before handling
2Content is 6.8g/L, through sedimentation and centrifugal after clear black liquor SiO
2All below 0.5g/L, the silica removal rate of rice straw black liquor is 94% to content.
Embodiment 2
The black liquor that bagasse pulp is extracted was put in the subsider natural subsidence 4 hours, formed supernatant liquor and lower floor's settled layer.Described upper strata black liquor SiO
2Content is below the 0.5g/L, send the evaporimeter concentration with it.SiO in lower floor's settled layer
2Content is 9g/L, it is delivered to the centrifugal machine of second horizontal helical type handle.The clear black liquor that obtains after the processing is delivered in the disk plate centrifuge and is handled, and the siliceous body refuse that obtains is sent in the dreg collecting slot.Clear black liquor obtains clarified solution and can deliver to evaporimeter and concentrate after disk plate centrifuge is handled, the siliceous body refuse that obtains is also delivered in the dreg collecting slot.Add hot water in dreg collecting slot, formation concentration is 15% siliceous body refuse suspension, this suspension is delivered to first horizontal screw centrifuge handle.Send disk plate centrifuge back to through the clear black liquor that obtains after the separating treatment and separate treated the draining of siliceous waste residue of the nearly neutrality that obtains.The conveying of black liquor adopts carbon steel or stainless steel pump and pipeline to carry.
Silica removal treatment effect: bagasse black liquor SiO before handling
2Content is 1.7g/L, through sedimentation and centrifugal after clear black liquor SiO
2All below 0.5g/L, the silica removal rate of bagasse black liquor is 74% to content.
Embodiment 3
The black liquor that Straw Pulp is extracted directly pumps into disk plate centrifuge and handles, and separates the clear liquid that obtains and is sent to evaporimeter and concentrates, and separates the siliceous body refuse that obtains and delivers in the dreg collecting slot, adds hot water in dreg collecting slot, forms concentration and be 12% siliceous body refuse suspension.This suspension pumped in first horizontal screw centrifuge handle, the clear black liquor that centrifugation obtains is sent disk plate centrifuge back to and is separated, and the wet siliceous waste residue of nearly neutrality that obtains can go back to the field.
Silica removal treatment effect: wheat straw black liquor SiO before handling
2Content is 3.6g/L, the clear black liquor SiO after centrifugal
2All below 0.5g/L, the silica removal rate of wheat straw black liquor is 90% to content.
Embodiment 4
The black liquor that reed pulp is extracted directly pumps into disk plate centrifuge and handles, and separates the clear liquid that obtains and is sent to evaporimeter and concentrates, and separates the siliceous body refuse that obtains and delivers in the dreg collecting slot, adds hot water in dreg collecting slot, forms concentration and be 14% siliceous body refuse suspension.This suspension pumped in first horizontal screw centrifuge handle, the clear black liquor that centrifugation obtains is delivered to evaporimeter and is concentrated, and the wet siliceous waste residue of nearly neutrality that obtains can go back to the field.
Silica removal treatment effect: reed pulp black liquor SiO before handling
2Content is 2.1g/L, the clear black liquor SiO after centrifugal
2All below 0.5g/L, the silica removal rate of reed pulp black liquor is 81% to content.
It should be noted that the present invention will be described rather than limit the invention for above-described embodiment, and those skilled in the art can design alternative embodiment under the situation of the scope that does not break away from 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 is not listed in element or step in the claim.Any order is not represented in the use of word first, second and C grade, can be title with these word explanations.
Claims (10)
1. the silicon removing method of a straw pulp black liquor comprises following operation:
(1) straw pulp black liquor is delivered to carried out centrifugal treating in the disk plate centrifuge, obtain first clear black liquor and the siliceous body refuse;
(2) described siliceous body refuse is sent into dreg collecting slot and added hot water, form siliceous body refuse suspension;
(3) described siliceous body refuse suspension is delivered to carried out centrifugal treating in first horizontal screw centrifuge, obtain second clear black liquor and the siliceous waste residue, the described second clear black liquor is delivered to handled in the described disk plate centrifuge until SiO wherein
2Content is less than 0.5g/L.
2. silicon removing method according to claim 1 is characterized in that: before described straw pulp black liquor is delivered to disk plate centrifuge, described straw pulp black liquor is carried out sedimentation handle, obtain supernatant liquor and settled layer after sedimentation is finished.
3. silicon removing method according to claim 2 is characterized in that: the time that described sedimentation is handled is 4-16h.
4. according to claim 2 or 3 described silicon removing methods, it is characterized in that: described silicon removing method further comprises described settled layer delivered to and carries out centrifugal treating in second horizontal screw centrifuge, obtains the 3rd clear black liquor and siliceous body refuse after centrifugal the finishing.
5. silicon removing method according to claim 1, it is characterized in that: the concentration of described siliceous body refuse suspension is 10-15%.
6. silicon removing method according to claim 1 and 2 is characterized in that: SiO in the described straw pulp black liquor
2Content is 1-8g/L.
7. silicon removing method according to claim 1 and 2, it is characterized in that: the separation factor of described disk plate centrifuge is 7000-12000, the separation factor of described first horizontal screw centrifuge and second horizontal screw centrifuge is 2000-4000.
8. silicon removing method according to claim 1 and 2, it is characterized in that: described disk plate centrifuge, first horizontal screw centrifuge and second horizontal screw centrifuge all adopt stainless steel or carbon steel to make.
9. silicon removing method according to claim 1 and 2 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.
10. silicon removing method according to claim 1 and 2, it 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 |
|---|
| 黎明芳: "减少草浆黑液在蒸发器结垢的途径", 《中国造纸》 * |
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Granted publication date: 20150729 Termination date: 20200603 |