CN103553083A - Improved combined-soda filter method - Google Patents
Improved combined-soda filter method Download PDFInfo
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- CN103553083A CN103553083A CN201310553299.9A CN201310553299A CN103553083A CN 103553083 A CN103553083 A CN 103553083A CN 201310553299 A CN201310553299 A CN 201310553299A CN 103553083 A CN103553083 A CN 103553083A
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- sodium bicarbonate
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Abstract
The invention discloses an improved combined-soda filter method. The improved combined-soda filter method comprises the following steps of: feeding sodium bicarbonate crystal slurry suspension liquid taken out from a combined-soda carbonizing tower into a horizontal belt type filter to carry out solid-liquid separation; and carrying out washing by adopting washing water while carrying out solid-liquid separation, wherein average diameter of the sodium bicarbonate crystal in the sodium bicarbonate crystal slurry suspension liquid is 100 microns -150 microns, temperature of the sodium bicarbonate crystal slurry suspension liquid is 38 DEG C-42 DEG C, ratio of a distance from a charging end of the filter to a blind plate of the horizontal belt type filter to length of the total filter surface of the filter is 1/4-1/3, and the first washing water pipe is arranged at a position 2m-2.5m in front of the blind plate. The improved combined-soda filter method disclosed by the invention eliminates unreasonable factors in configuration of filter equipment, lowers equivalent weight of the washing water, not only can solve mother liquor swelling, but also can ensure low salinity of the product.
Description
Technical field
The present invention relates to filter method, the invention particularly relates to improved alkali filter method.
Background technology
Connection alkali is produced a process solid-liquid separation and is adopted horizontal vacuum belt filter, and horizontal belt filter core component is to filter balata belt as shown in the figure, and belt filtering surface upper berth filter cloth 1.Belt filters outside surface You Transverse groove, groove is from belt both sides to intermediate, inclined, be conducive to filtrate drawing off, in the middle of belt, longitudinally there is a uniform aperture in row interval, vacuum pan 2 is led in aperture bottom, vacuum pan and belt are sealed by wear-resistant strip, and during production, filter cloth, balata belt slide together with wear-resistant strip on vacuum pan.Under vacuum pan, pick out several vacuum hoses 3, filtrate is derived.
Filtering surface is from material feeding box one end to approximately 30 meters of exhaust ends, and band pusher side face has a major diameter vacuum pipeline, and this root pipeline one side is connected with tens vacuum hoses, is feed liquor part; Opposite side is connected with two gas-liquid separators 5, in the middle of valve tube 4, by blind plate 8, separated, separate the first and second filtrating areas, road, first filtration zone is positioned at material feeding box to the position of second wash water (vacuum pipeline blind plate), filter cake is after first wash water pipe 7 rinses, with leach mother liquor and mix, by valve tube, enter mother liquor gas-liquid separator 5.Second filtration zone be second wash water to discharging position, leach wash water and enter wash water gas-liquid separator 6 by valve tube.
The power that horizontal belt filter carries out solid-liquid separation comes from the pressure reduction being produced in filtration medium both sides by vacuum machine.
What carbonization was synthetic goes out alkali lye by material feeding box, and after being evenly distributed on filter cloth, under vacuum action, by solid, (major ingredient is NaHCO to filter cloth
3crystalline mixture) hold back, filter cake forms, and through the washing of first wash water and filtration, then enters the washing of second wash water and filtrating area, and the end in second washing and filtering district is discharging region, and filter cake unloads to be fallen on travelling belt, completes and filters and washing.
First filtration washing district leaches liquid and has sneaked into first wash water, to produce mother liquor (being called MI), it is wash water (be called and wash rear liquid) that second filtration washing district leaches liquid, wash the source that rear liquid is first wash water, wash rear liquid and all add mother liquor, to keep wash water balance and meet the requirement of environmental protection.
Under vacuum action, filtrate is through cake layer and filter cloth, enter in the Shui Ping Transverse groove of dehydration belt, flow to the middle aperture of belt, then by vacuum pan and valve tube flexible pipe, enter the vacuum pipeline with pusher side face, first filtrate enters MI separator, and second filtrate enters wash water separator, after gas-liquid separation, filtrate enters respectively MI bucket and washes rear liquid bucket.
First filtrating area, filtrate is infiltrated the boundary line of filter cake completely, apart from first wash water near distance, filter cake just forms, also have little time filter mother liquor to the greatest extent wherein, first wash water has just added, and wash water just mixes in advance with mother liquor, wash water was wanted residual mother liquor between wash crystallization body originally, did not reach now such effect.In order to make product salt content low, filtration procedure will be isolated the mother liquor in filter cake as far as possible, can only strengthen second leaching requirement, wash water after second filters is all for first wash water, first wash water just increases like this, result causes joining alkali liquor and expands, and this is to cause one of connection alkali liquor expansion major reason.
Application number is that the Chinese patent of CN201210071308.6 discloses " a kind of processing method of strengthening the filtration of connection alkali ", the method was comprised of pre-concentration stage, cloth filtration stage and predrying stage, it is to make as follows: 1) the pre-concentration stage: the sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is first passed through to preconcentrator, preliminary pre-concentration obtains containing the suspension of solid and clear mother liquor, and clear mother liquor flows automatically to mother vat; 2) cloth filtration stage: the separation that step 1 is obtained flows automatically to the cloth hopper of horizontal vacuum belt filter afterwards containing the suspension of solid, order is by fillter section and the washing section of horizontal vacuum belt filter; 3) the predrying stage: the filter cake that step 2 is obtained carries out predryingly through being arranged at the predrying device of predrying section, obtains heavy alkali product; Wherein: pre-concentration is used preconcentrator in the stage, in the predrying stage, use predrying device.But the method not mentioned can solution are produced mother liquor and are expanded and can guarantee the method for low salt again.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, provide a kind of can solution to produce a kind of improved alkali filter method that mother liquor expansion can guarantee again product low salt.
The object of the invention is to realize by following proposal.
The connection alkali filter method of a modification of the present invention, it comprises the following steps:
The sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 100-150 micron, sodium bicarbonate magma suspension temperature is 38 ℃～42 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 1/4-1/3, and first wash water pipe position is arranged on the front 2-2.5m of blind plate place.
Adopt beneficial effect of the present invention: blind plate is arranged on first and place, line of delimitation, second filtrating area, in first filtrating area, filtrate boundary line apart from increasing, has the regular hour to filter mother liquor residual in clean filter cake apart from first wash water, second leaching requirement reduces, and corresponding first wash water reduces.Present method has been eliminated the factor of filter plant unreasonable allocation, has reduced wash water equivalent, can solve the expansion of production mother liquor and can guarantee product low salt again.If it is 100-150 micron that sodium bicarbonate crystal does not meet mean diameter, when suspension temperature is 38 ℃～42 ℃ requiring, if guarantee the low salt of product, wash water equivalent is just higher than 0.55 cubic metre of soda ash product per ton, along with sodium bicarbonate xln diminishes, wash water equivalent rises rapidly, causes mother liquor to expand and is forced to stop work.
Accompanying drawing explanation
Accompanying drawing is the structural representation of the horizontal belt filter that adopts of the connection alkali filter method of a modification of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further:
The connection alkali filter method of a modification of the present invention as shown in drawings, it comprises the following steps: the sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 100-150 micron, sodium bicarbonate magma suspension temperature is 38 ℃～42 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 1/4-1/3, first wash water pipe position is arranged on the front 2-2.5m of blind plate place.
The sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 100 microns, sodium bicarbonate magma suspension temperature is 38 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 7/24, and first wash water pipe position is arranged on the front 2.2m of blind plate place.
After tested: at band machine actual production lower than design maximum, when wash water equivalent is controlled at 0.49～0.52 cubic metre of this scope of soda ash product per ton, product salt just can reach national industrial sodium carbonate II class top grade level (lower than 0.7%), and level of the same trade is 0.55～0.60 cubic metre of soda ash product per ton.And band machine turnout reaches design maximum, as long as wash water equivalent is controlled at 0.52～0.55 cubic metre of this scope of soda ash product per ton, product salt also can reach national II class top grade level (lower than 0.7%), compare, the same industry will reach this quality product, and wash water equivalent level of control is at 0.55～0.65 cubic metre of soda ash product per ton.Connection alkali is produced a process mother liquor shrinkage amplitude and is reached 2.5%, and do not adopt mother liquor shrinkage amplitude before present method, is 2.1%.
The sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 150 microns, sodium bicarbonate magma suspension temperature is 42 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 1/3, and first wash water pipe position is arranged on the front 2.5m of blind plate place.
After tested: when band machine turnout reaches design maximum, when wash water equivalent is controlled at 0.50～0.54 cubic metre of this scope of soda ash product per ton, product salt just can reach national II class top grade level (lower than 0.7%); And 0.55～0.65 cubic metre of soda ash product per ton of level of the same trade, and band machine turnout is during lower than design maximum, wash water equivalent is controlled lower, be in 0.49～0.52 cubic metre of soda ash product scope per ton, product salt just can reach national II class top grade level (lower than 0.7%), and level of the same trade is 0.55～0.60 cubic metre of soda ash product per ton.Connection alkali is produced a process mother liquor shrinkage amplitude and is reached 2.6%, larger than mother liquor shrinkage rates 2.0% of the same trade.
The sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 130 microns, sodium bicarbonate magma suspension temperature is 40 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 1/4, and first wash water pipe position is arranged on the front 2m of blind plate place.
After tested: when band machine turnout reaches design maximum, wash water equivalent controls to 0.52～0.54 cubic metre of this scope of soda ash product per ton, product salt just can reach national II class top grade level (lower than 0.7%), and level of the same trade is 0.55～0.65 cubic metre of soda ash product per ton.Band machine turnout is lower than design during maximum, wash water equivalent can be controlled lower, be in 0.49～0.52 cubic metre of this scope of soda ash product per ton, product salt just can reach national II class top grade level (lower than 0.7%), and level of the same trade is 0.55～0.60 cubic metre of soda ash product per ton.Connection alkali is produced a process mother liquor shrinkage amplitude and is reached 2.3%, compares the same industry 2.0% large.
Claims (1)
1. an improved alkali filter method, it is characterized in that it comprises the following steps: the sodium bicarbonate magma suspension taking out from connection alkali carbonating tower is sent into horizontal belt filter and carry out solid-liquid separation, when carrying out solid-liquid separation, adopt wash water to wash, sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 100-150 micron, sodium bicarbonate magma suspension temperature is 38 ℃～42 ℃, distance and the total filtering surface Length Ratio of filter of the blind plate from horizontal belt filter feed end to described horizontal belt filter are 1/4-1/3, first wash water pipe position is arranged on the front 2-2.5m of blind plate place.
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| CN201310553299.9A CN103553083B (en) | 2013-11-07 | 2013-11-07 | Improved combined-soda filter method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717100A (en) * | 2009-11-28 | 2010-06-02 | 大连化工研究设计院 | Method for producing low-salt high-quality soda ash dense |
| CN102320631A (en) * | 2011-08-22 | 2012-01-18 | 贺友林 | Method for producing low-salt high-quality sodium carbonate by combined filtration |
| CN102602964A (en) * | 2012-03-19 | 2012-07-25 | 大连润琳科技有限公司 | Process method for reinforced alkali-united filtration |
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2013
- 2013-11-07 CN CN201310553299.9A patent/CN103553083B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717100A (en) * | 2009-11-28 | 2010-06-02 | 大连化工研究设计院 | Method for producing low-salt high-quality soda ash dense |
| CN102320631A (en) * | 2011-08-22 | 2012-01-18 | 贺友林 | Method for producing low-salt high-quality sodium carbonate by combined filtration |
| CN102602964A (en) * | 2012-03-19 | 2012-07-25 | 大连润琳科技有限公司 | Process method for reinforced alkali-united filtration |
Non-Patent Citations (3)
| Title |
|---|
| 李正明: "降低纯碱盐分的有效途径", 《纯碱工业》 * |
| 王全: "降低联碱法纯碱产品盐份的探讨", 《纯碱工业》 * |
| 许昌犁: "联碱厂生产低盐重质纯碱的两种工艺路线的比较及可行性讨论", 《纯碱工业》 * |
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Address after: 300450 No. ten, 3369 Bohai Road, Lingang industrial area, Tianjin, Tanggu Patentee after: Bo Huayongli chemical inc, Tianjin Address before: 300450 No. ten, 3369 Bohai Road, Lingang industrial area, Tianjin, Tanggu Patentee before: Tianjin Alkali Plant, Bohai Chemical Co., Ltd, Tianjin |