CN103553083B - Improved combined-soda filter method - Google Patents
Improved combined-soda filter method Download PDFInfo
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- CN103553083B CN103553083B CN201310553299.9A CN201310553299A CN103553083B CN 103553083 B CN103553083 B CN 103553083B CN 201310553299 A CN201310553299 A CN 201310553299A CN 103553083 B CN103553083 B CN 103553083B
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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 the connection alkali filter method of improvement.
Background technology
Connection alkali is produced a process solid-liquid separation and is adopted horizontal vacuum belt filter, and horizontal belt filter core component filters 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, a uniform aperture in row interval is longitudinally had in the middle of belt, vacuum pan 2 is led to bottom aperture, 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.Pick out several vacuum hose 3 under vacuum pan, filtrate is derived.
Filtering surface is from material feeding box one end to exhaust end about 30 meters, and there is a major diameter vacuum pipeline in band pusher side face, and this root pipeline side is connected with tens vacuum hoses, is feed liquor part; Opposite side is connected with two gas-liquid separators 5, separated by blind plate 8 in the middle of valve tube 4, separate the first and second filtrating areas, road, first filtration zone is positioned at the position of material feeding box to second wash water (vacuum pipeline blind plate), filter cake is after first wash water pipe 7 rinses, with leach mother liquor and mix, enter mother liquor gas-liquid separator 5 by valve tube.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 produced in filtration medium both sides by vacuum machine.
What carbonization was synthesized goes out alkali lye by material feeding box, and be evenly distributed to after on filter cloth, under vacuum, by solid, (major ingredient is NaHCO to filter cloth
3crystalline mixture) retain, filter cake is formed, and through the washing of first wash water and filtration, then enter the washing of second wash water and filtrating area, the end in second washing and filtering district is discharge region, and filter cake unloads to be fallen on travelling belt, completes and filters and washing.
First filtration washing district leaches liquid and has been mixed into first wash water, 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 washing water density and meet the requirement of environmental protection.
Under vacuum, filtrate is through cake layer and filter cloth, enter in the Shui Ping Transverse groove of dehydration belt, flow to the aperture in the middle of belt, then entered the vacuum pipeline in band pusher side face by vacuum pan and valve tube flexible pipe, first filtrate enters MI separator, and second filtrate enters wash water separator, after gas-liquid separation, filtrate enters MI bucket respectively and washes rear liquid bucket.
First filtrating area, filtrate infiltrates the boundary line of filter cake completely, near apart from first wash water distance, filter cake is just formed, also have little time to filter mother liquor to the greatest extent wherein, first wash water just adds, and wash water just mixes in advance with mother liquor, wash water 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 isolate the mother liquor in filter cake as far as possible, second leaching requirement can only be strengthened, wash water after second filters is all for first wash water, such first wash water just increases, result causes connection alkali liquor to expand, and this causes one of connection alkali liquor expansion major reason.
Application number is that the Chinese patent of CN201210071308.6 discloses " a kind of processing method strengthened connection alkali and filter ", the method is made up of pre-concentration stage, cloth filter stage and pre-drying phase, it obtains as follows: 1) the pre-concentration stage: by the sodium bicarbonate magma suspension from the taking-up of connection alkali carbonating tower first through preconcentrator, preliminary pre-concentration obtains containing the suspension of solid and clear mother liquor, and clear mother liquor flows automatically to mother vat; 2) the cloth filter stage: separation step 1 obtained flows automatically to the cloth hopper of horizontal vacuum belt filter afterwards containing the suspension of solid, sequentially pass through fillter section and the washing section of horizontal vacuum belt filter; 3) pre-drying phase: the pre-dryer of filter cake step 2 obtained through being arranged at predrying section carries out predrying, obtains heavy alkali product; Wherein: pre-concentration uses preconcentrator in the stage, uses pre-dryer in pre-drying phase.But the method not mentioned can solution are produced mother liquor and are expanded and can ensure again the method for low salt.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, provide a kind of can solution to produce the connection alkali filter method that mother liquor expansion can ensure again a kind of improvement of product low salt.
The object of the invention is to be realized 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 taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while 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 DEG C ~ 42 DEG C, from horizontal belt filter feed end to the total filtering surface length of the distance of the blind plate of described horizontal belt filter and filter than being 1/4-1/3, first wash water pipe position is arranged on 2-2.5m place before blind plate.
Adopt beneficial effect of the present invention: blind plate is arranged on first and line of delimitation place, second filtrating area, in first filtrating area, filtrate boundary line strengthens apart from first wash water distance, has the regular hour to filter mother liquor residual in clean filter cake, second leaching requirement reduces, and corresponding first wash water reduces.Present method eliminates the factor of filter plant unreasonable allocation, reduces wash water equivalent, can solve the expansion of production mother liquor and can ensure product low salt again.If it is 100-150 micron that sodium bicarbonate crystal does not meet mean diameter, when suspension temperature is the requirement of 38 DEG C ~ 42 DEG C, if ensure the low salt of product, then 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 the connection alkali filter method of a modification of the present invention adopts.
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 taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while 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 DEG C ~ 42 DEG C, from horizontal belt filter feed end to the total filtering surface length of the distance of the blind plate of described horizontal belt filter and filter than being 1/4-1/3, first wash water pipe position is arranged on 2-2.5m place before blind plate.
Embodiment 1
The sodium bicarbonate magma suspension taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while 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 DEG C, be 7/24 from horizontal belt filter feed end to the total filtering surface length ratio of the distance of the blind plate of described horizontal belt filter and filter, first wash water pipe position is arranged on 2.2m place before blind plate.
After tested: at band machine actual production lower than design maximum, wash water equivalent controls when 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 the machine turnout of being with reaches design maximum, as long as wash water equivalent controls 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 before not adopting present method, mother liquor shrinkage amplitude is 2.1%.
Embodiment 2
The sodium bicarbonate magma suspension taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while 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 DEG C, be 1/3 from horizontal belt filter feed end to the total filtering surface length ratio of the distance of the blind plate of described horizontal belt filter and filter, first wash water pipe position is arranged on 2.5m place before blind plate.
After tested: when band machine turnout reaches design maximum, wash water equivalent controls when 0.50 ~ 0.54 cubic metre of this scope of soda ash product per ton, and product salt just can reach national II class top grade level (lower than 0.7%); And level of the same trade 0.55 ~ 0.65 cubic metre soda ash product per ton, and when being with machine turnout lower than design maximum, wash water equivalent controls 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.
Embodiment 3
The sodium bicarbonate magma suspension taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while 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 DEG C, be 1/4 from horizontal belt filter feed end to the total filtering surface length ratio of the distance of the blind plate of described horizontal belt filter and filter, first wash water pipe position is arranged on 2m place before blind plate.
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.When band machine turnout is lower than design maximum, wash water equivalent can control 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. the connection alkali filter method improved, the sodium bicarbonate magma suspension taken out from connection alkali carbonating tower is sent into horizontal belt filter and carries out solid-liquid separation, while carrying out solid-liquid separation, adopt wash water to wash, it is characterized in that: the sodium bicarbonate crystal mean diameter in described sodium bicarbonate magma suspension is 100-150 micron, sodium bicarbonate magma suspension temperature is 38 DEG C ~ 42 DEG C, from horizontal belt filter feed end to the total filtering surface length of the distance of the blind plate of described horizontal belt filter and filter than being 1/4-1/3, first wash water pipe position is arranged on 2-2.5m place before blind plate.
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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 |
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| 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;许昌犁;《纯碱工业》;19971231(第3期);全文 * |
| 降低纯碱盐分的有效途径;李正明;《纯碱工业》;20071231(第4期);全文 * |
| 降低联碱法纯碱产品盐份的探讨;王全;《纯碱工业》;19981231(第4期);全文 * |
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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 |