CN1267348C - Solid-liquid separation technique for preparing high assay and industrial solid product of sodium cyanide - Google Patents
Solid-liquid separation technique for preparing high assay and industrial solid product of sodium cyanide Download PDFInfo
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- CN1267348C CN1267348C CN 200410034438 CN200410034438A CN1267348C CN 1267348 C CN1267348 C CN 1267348C CN 200410034438 CN200410034438 CN 200410034438 CN 200410034438 A CN200410034438 A CN 200410034438A CN 1267348 C CN1267348 C CN 1267348C
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- drum filter
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- chamber drum
- sodium cyanide
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- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000007788 liquid Substances 0.000 title claims abstract description 43
- 238000000926 separation method Methods 0.000 title abstract description 19
- 238000003556 assay Methods 0.000 title 1
- 239000012265 solid product Substances 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 36
- 239000007787 solid Substances 0.000 claims abstract description 26
- 239000000725 suspension Substances 0.000 claims abstract description 26
- 239000012065 filter cake Substances 0.000 claims abstract description 24
- 238000005516 engineering process Methods 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000002425 crystallisation Methods 0.000 claims abstract description 20
- 230000008025 crystallization Effects 0.000 claims abstract description 20
- 239000002912 waste gas Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000000047 product Substances 0.000 claims abstract description 9
- 239000000706 filtrate Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 8
- 239000013081 microcrystal Substances 0.000 claims description 8
- 230000008676 import Effects 0.000 claims description 7
- 238000007791 dehumidification Methods 0.000 claims description 6
- 229920004934 Dacron® Polymers 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 13
- 238000001704 evaporation Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 6
- 230000008020 evaporation Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 208000005156 Dehydration Diseases 0.000 description 19
- 230000018044 dehydration Effects 0.000 description 19
- 238000006297 dehydration reaction Methods 0.000 description 19
- 238000013461 design Methods 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000004744 fabric Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The present invention discloses solid and liquid separation technology for preparing a high-content industrial solid sodium cyanide product, which is characterized in that sodium cyanide suspension liquid in a crystallizer is conveyed into a rotary-drum vacuum filter without a grid chamber from the bottom of the rotary-drum vacuum filter for filtration, and a filter cake at a discharge port is blown for fall by blowback compressed air and then enters a drying procedure; filter liquor falls into a mother liquor storage tank through two gas and water separators in front of a water circular vacuum pump, and water and technical waste gas which are discharged from the vacuum pump are separated by a postpositive gas and water separator; the technical waste gas is heated by an air heater and then forms hot air to enter a filter, the filter cake and the residual filtered liquor in the filter cake are heated, and the water in the postpositive gas and water separator is cooled by a plate type heat exchanger and then is conveyed to the water circular vacuum pump for cyclic use. The present invention obviously reduces requirements to technical parameters of an evaporation procedure and a crystallization procedure, and evaporating energy consumption in the process of preparation and increases productivity; when the solid and liquid separation technology is used for designing a high-content solid sodium cyanide device with the year output of 16 thousand tons, compared with the existing horizontal type scraper discharging centrifugal machine systems, the present invention obviously reduces construction investment, has less waste gas and accords with the requirements of clean production.
Description
One, technical field
The present invention relates to a kind of solid-liquid separating method for preparing high-content industry sodium cyanide product.
Two, background technology
Sodium cyanide belongs to the inorganic salts in the chemical, and sodium cyanide has two types of liquid and solids as product.High-content industry sodium cyanide (referring to NaCN content 〉=98.0%) is mainly used in industries such as chemical industry, light industry, plating, gold, medicine, and of many uses, usage quantity is big.
All produce the producer of solid sodium cyanide in the world, operational path is identical substantially, promptly at first utilize caustic soda (NaOH) and prussic acid (HCN) reaction solution body sodium cyanide, again to its evaporate, crystallization, solid-liquid separation (dehydration), dry (further dehydration), compression molding and metering packing, thereby obtain the solid sodium cyanide product.In this technical process, having only the first road reaction process is chemical reaction process, and other operation all is based on physical change.For the production of high-content industry sodium cyanide product, the selection of solid-liquid separating method is a key, because the quality of dehydrating effect not only has influence on down the running cost of road drying process, and influences final quality product.
Solid-liquid separation dehydration technology mainly contains separation modes such as sedimentation, filtration, the equipment of settlement separate employing mainly contains settlement separator, hydroseparator, mechanical separator, centrifuge separator, gravity separator, inertial separator, clarifying tank, flocking settling equipment, continuous sedimentation thickening equipment etc., and the equipment that filtering separation adopts mainly contains gravity filtration device, pressure filter, vacuum filter, enrichment filter plant, clarification filtration equipment, centrifugal filter etc.The equipment of traditional sodium cyanide solid-liquid separation dehydration process using is horizontal scraper discharging centrifuge (belonging to a kind of of centrifugal filter), this whizzer filter operation is an interval type, stable performance, filter material is had no special requirements, adaptability is strong, and shortcoming is to vibrate greatlyyer, and high-speed rotary part damages easily, its inner scraper and rake cutter are also easy to wear, simultaneously the material crystallite size are had requirement.
Horizontal scraper discharging centrifuge application technology flow process in solid sodium cyanide production is: the sodium cyanide suspension in the crystallizer (containing solid volume percentage ratio 60-80%) is extracted out through the crystallization submerged pump, stably supplies with whizzer by the whizzer charging tank and carries out centrifugation; Whizzer is horizontal cage type, self acting in batches, regulate by the time-program(me) pilot circuit, with feed, dehydration, discharge, four processes of idling as a loop cycle, ten cycles of circulating are washed net once, make attached to the remaining filter cake dissolving of the sodium cyanide on the whizzer filtering net, guarantee its normal operation; The moisture mass percent of moist press cake that the whizzer discharge port is discharged is no more than 10%, supplying with moisture eliminator through worm conveyor further dewaters, the filtrate that whizzer is separated is back to the fluid circulation system mother liquid tank through the gas-liquid separation groove, the whizzer feeder system also is a circulation, and excessive suspension returns crystallizer through the whizzer charging tank.
Producing 10000 tons of solid sodium cyanide devices per year with certain company's design is example, and horizontal scraper discharging centrifuge is used in solid sodium cyanide production and mainly had following problem:
1. employing horizontal scraper discharging centrifuge, technology controlling and process to liquid system evaporation, Crystallization Procedure is relatively harsher, sodium cyanide suspension after requirement evaporation, the crystallization contains solid volume percentage ratio and must reach 60-80%, and the crystallization size of microcrystal reaches 100 μ m in the suspension.
2. the horizontal scraper discharging centrifuge of this device employing is from the import of Japanese Tomoe Engineering Co., Ltd., totally 2,69334250 yen of contract values, cost an arm and a leg, separate unit throughput is 840kg/h (wet basis), automatic intermittent type, throughput is on the low side, can not adapt to the needs that this plant capacity enlarges.
3. since the horizontal scraper discharging centrifuge of this device employing came into operation from nineteen ninety-five, mechanical vibration and noise strengthened gradually, owing to adopt the import spare parts and components, the maintaining expense is also bigger.
Three, summary of the invention
Technical problem to be solved by this invention provides a kind of solid-liquid separating method for preparing high-content industry sodium cyanide product, it has obviously reduced the requirement to liquid system evaporation, Crystallization Procedure processing parameter in the preparation process, the moisture mass percent of moist press cake of discharging after guaranteeing solid-liquid separation is no more than in 10%, satisfies the requirement that production capacity improves.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is such: the sodium cyanide suspension in the crystallizer is extracted out through the crystallization submerged pump, and by sending into no lattice chamber drum filter inner filtration from the bottom after the control feed size, the discharge port filter cake is blown off by blowback pressurized air and enters drying process and further dewater; The filtrate that water ring vacuum pump is extracted out two-stage air water separator before vacuum pump relies on the effect of liquid level difference to fall into the fluid circulation system mother liquid tank, simultaneously, water, technology waste gas that water ring vacuum pump is discharged separate through rearmounted air water separator, technology waste gas forms hot blast and is blown into no lattice chamber drum filter by the top after the airheater heating, filter cake and the filtrate that remains in the filter cake are heated, and the water in the rearmounted air water separator is delivered to water ring vacuum pump and is recycled after the plate-type heat exchanger cooling; The control condition of no lattice chamber drum filter is:
(1) no lattice chamber drum filter inlet sodium cyanide suspension contains solid volume percentage ratio: 2-80%;
(2) no lattice chamber drum filter discharging compression process air flow quantity: 30-180m
3/ h;
(3) no lattice chamber drum filter discharging compression process air pressure: 0.01-0.04Mpa;
(4) interior vacuum tightness: the 20-60kpa of no lattice chamber drum filter rotary drum;
(5) no lattice chamber drum filter rotating speed: 1-20rpm;
(6) no lattice chamber drum filter rotary drum filtering net cleaning way and pure water consumption: continue to clean used pure water consumption 50-100kg/h;
(7) no lattice chamber drum filter filtering net material: high strength heatproof polypropylene or woven dacron;
(8) no lattice chamber drum filter hot blast temperature: 25-250 ℃;
(9) no lattice chamber drum filter hot blast consumption: 500-4800m
3/ h;
(10) crystallization size of microcrystal in the no lattice chamber drum filter inlet sodium cyanide suspension: 〉=15 μ m.
For guaranteeing the ordinary production operation, between no lattice chamber drum filter system and next procedure dehumidification system, be provided with interlocking:
When turning valve shuts down, result in blockage, stop for preventing that dehumidification system from gathering materials, the interlocking action, the dryer feed worm conveyor shuts down, water ring vacuum pump import motorized adjustment butterfly valve is opened emptying, no lattice chamber drum filter system loss of vacuum, filter also shuts down simultaneously.
Because the present invention adopts no lattice chamber drum filter, simultaneously for to guarantee that the moisture mass percent of filter cake that does not have lattice chamber drum filter dehydration operation output is no more than 10%, satisfy the requirement of drying process, reduce discharge amount of exhaust gas, the technology waste gas that water ring vacuum pump is discharged fully utilizes, set up close circulation technology, adopt airheater that technology waste gas is added the thermosetting hot blast, utilize hot blast that filter cake on the drum filter rotary drum of no lattice chamber and the filtrate that remains in the filter cake are heated again, for drying process provides reliable assurance.Therefore the present invention has following characteristics:
(1) the sodium cyanide suspension that is used to not have lattice chamber drum filter solid-liquid separation dehydration contains solid volume percentage ratio and all can filter more than 15 μ m with interior and crystallization size of microcrystal at 2-80%, and the sodium cyanide suspension of horizontal scraper discharging centrifuge dehydration contains solid volume percentage ratio and must reach 60-80%, and the crystallization size of microcrystal must be more than 100 μ m.The present invention has widened the process control condition of sodium cyanide device liquid system, is easy to keep the balance of turnout and steam output.
(2) adopt no lattice chamber drum filter to carry out dehydration operation, improved the continuity that device is produced, the corresponding throughput that also enlarges device.
(3) under the situation that the sodium cyanide device evaporates, the Crystallization Procedure operating mode is good, adopt no lattice chamber drum filter to carry out dehydration operation, the moisture mass percent of the filter cake of its output is no more than 10%, satisfies the requirement of drying process; Adopt hot blast that filter cake and the filtrate that remains in the filter cake are heated, more it provides reliable assurance.
(4) because no lattice chamber drum filter is a low-speed running, therefore eliminated vibration, frequency of maintenance is low, and the maintaining expense is little.
The present invention is used in design and produces per year on 1.6 ten thousand tons of high-contents industry sodium cyanide devices than existing horizontal scraper discharging centrifuge system and can significantly reduce construction investment, the moisture mass percent of moist press cake of discharging after guaranteeing solid-liquid separation is no more than in 10%, satisfies the requirement that production capacity improves.The present invention is owing to adopted close circulation technology, and pollutent waste gas generation seldom meets the requirement of cleaner production.The solid-liquid separation dehydration technology that is used at present high-content industry Sodium Cyanide Production in the world mainly is a horizontal scraper discharging centrifuge technology, no lattice provided by the invention chamber drum filter solid-liquid separating method is the dehydration technique of a kind of advanced person, saving investment, this method not only can promote domestic sodium cyanide industry key equipment production domesticization paces, and has recommended a kind of new method for the solid-liquid separation in the high-content industry Sodium Cyanide Production process.
Four, description of drawings
Fig. 1 is a no lattice of the present invention chamber drum filter principle of work synoptic diagram;
Fig. 2 is a process flow sheet of the present invention.
Five, embodiment
Referring to Fig. 1, no lattice chamber drum filter is a kind of typical continuous filter, its main body is the cylinder of a rotation, circle for every time and can finish filtration, washing, drying, unload operations such as cake and filter cloth regeneration, its filtration operation is carried out under negative pressure, so claim no lattice chamber drum filter.But except that my company, no lattice chamber drum filter does not still have the application achievement in solid sodium cyanide manufacturer.
Its principle of work is: suspension is sent in the reservoir 5 through no lattice chamber drum filter bottom by former process, reservoir is a rectangular pyramid body, and a side is provided with overflow plate 9 control liquid levels, and suspension ceaselessly flows in the maintenance reservoir, material can not precipitate, and spillage returns former process; One inside is in vacuum, the rotary drum 1 that the outside is covered with filter cloth immerses in the suspension of reservoir by certain degree of depth, and rotation at leisure, under the effect of vacuum pump 13, form vacuum, filtrate sucks pipe core 2 by vacuum tail pipe 3, enter elementary knockout drum 10, secondary knockout drum 11 by pipe core, under the effect of liquid absorbing pump 12, filtrate is drawn out of; Solid particulate is then stayed the outside and thickeied gradually by filter cloth becomes filter cake 7, rotation along with rotary drum, the filter cake that exposes liquid level is no longer thickeied and is begun dehydration, finishes until back blow port 4 dehydrations, and being blown off by blowback pressurized air at the back blow port filter cake enters feed opening 6 to next procedure; The cleaning of filter cloth can continue by the filter cloth on the rotary drum of 8 pairs of rotations of shower to clean, and controls certain cleaning liquid measure, and scavenging solution is taken away with filtrate under the effect of vacuum.
No lattice chamber drum filter has the following advantages:
(1) the energy continuous automatic operation is saved manpower.
(2) variable factor of design and operation is many, and the suspension that can adapt to multiple different in kind carries out the different solid-liquid separation that require.
(3) simple in structure, be easy to airtight, the filtration efficiency height.
(4) operate steadily, noise is low, and operation site cleaning is easy to maintenance and expense is low.
Sodium cyanide suspension solid content and crystallization size of microcrystal size after evaporation, crystallization have certain fluctuation, principle and advantage in conjunction with no lattice chamber drum filter, we think, adopting no lattice chamber drum filter is feasible as the solid-liquid separation dehydration equipment of solid sodium cyanide, in production practice, key is to carry out 2 points:
(1) need determine lectotype selection according to industrial scale and economy.
(2) technological process of production and control condition determines.
Producing 1.6 ten thousand tons of high-content industry sodium cyanide devices per year with design is example, selecting homemade hermetic type, drum size for use is the no lattice chamber drum filter of φ 1200mm * 600mm, interior other utility appliance of filter system is type selecting in view of the above, 7 of total equipment comprise 1 of water ring vacuum pump, 2 of preposition air water separators, 1 of rearmounted air water separator, 1 of airheater, 1 of plate-type heat exchanger.System installed capacity is 92.2kw, and the maximum steam consumption of airheater (0.3Mpa steam) is 300kg/h, about 54 square metres of floor space.
Instrument and Controlling System are selected the DCS distributed control system for use, realize intelligent management.
Referring to Fig. 2, the technological process of production of the present invention is:
Crystallizer 14 includes the sodium cyanide suspension of solid volume percentage ratio 2-80% through crystallization submerged pump 15, and by entering in the reservoir of no lattice chamber drum filter from no lattice chamber drum filter 17 bottom feed mouths after the variable valve 16 control feed size, reservoir is a rectangular pyramid body, one side is provided with overflow plate control liquid level, suspension ceaselessly flows in the maintenance reservoir, material can not precipitate, and excessive suspension returns crystallizer by the overflow plate side; Under the vacuum action that water ring vacuum pump 18 forms, one inside is in vacuum, the outside is covered with in the suspension of rotary drum by certain degree of depth immersion reservoir of filtering net, and rotation at leisure, because the effect of vacuum, filtrate is inhaled into, solid particulate then be filtered net stay the outside and gradually thickening become filter cake, along with rotary drum rotates with certain rotating speed, the filter cake that exposes liquid level is no longer thickeied and is begun dehydration, finish until discharge port dehydration, being blown off by blowback pressurized air 19 at the discharge port filter cake enters drying process 20 and further dewaters; The filtrate that water ring vacuum pump is extracted out relies on the effect of liquid level difference to be back to fluid circulation system mother liquid tank 23 through the preposition air water separator 21,22 of vacuum pump, simultaneously, water, technology waste gas that water ring vacuum pump is discharged separate in rearmounted air water separator 24, technology waste gas forms hot blast by airheater 25 heating backs and is blown into filter through the filter top, filter cake and the filtrate that remains in the filter cake are heated, to improve dehydrating effect; Water in the rearmounted air water separator is delivered to water ring vacuum pump and is recycled after plate-type heat exchanger 27 coolings, the cleaning of filtering net can continue to clean with the filter cloth on the rotary drum of 26 pairs of rotations of pure water by shower, control certain cleaning water yield, scavenging solution is taken away with filtrate under the effect of vacuum.
The control condition of no lattice chamber drum filter is:
(1) no lattice chamber drum filter inlet sodium cyanide suspension contains solid volume percentage ratio: 2-40%;
(2) no lattice chamber drum filter discharging compression process air flow quantity: 30m
3/ h;
(3) no lattice chamber drum filter discharging compression process air pressure: 0.01Mpa;
(4) interior vacuum tightness: the 20kpa of no lattice chamber drum filter rotary drum;
(5) no lattice chamber drum filter rotating speed: 1rpm;
(6) no lattice chamber drum filter rotary drum filtering net cleaning way and pure water consumption: continue to clean used pure water consumption 50kg/h;
(7) no lattice chamber drum filter filtering net material: high strength heatproof polypropylene or woven dacron;
(8) no lattice chamber drum filter hot blast temperature: 25 ℃;
(9) no lattice chamber drum filter hot blast consumption: 500m
3/ h;
(10) crystallization size of microcrystal in the no lattice chamber drum filter inlet sodium cyanide suspension: 〉=15 μ m.
The control condition of no lattice chamber drum filter or be:
(1) no lattice chamber drum filter inlet sodium cyanide suspension contains solid volume percentage ratio: 40-80%;
(2) no lattice chamber drum filter discharging compression process air flow quantity: 180m
3/ h;
(3) no lattice chamber drum filter discharging compression process air pressure: 0.04Mpa;
(4) interior vacuum tightness: the 60kpa of no lattice chamber drum filter rotary drum;
(5) no lattice chamber drum filter rotating speed: 20rpm;
(6) no lattice chamber drum filter rotary drum filtering net cleaning way and pure water consumption: continue to clean used pure water consumption 100kg/h;
(7) no lattice chamber drum filter filtering net material: high strength heatproof polypropylene or woven dacron;
(8) no lattice chamber drum filter hot blast temperature: 250 ℃;
(9) no lattice chamber drum filter hot blast consumption: 4800m
3/ h (maximum is no more than the design exhaust capacity of water ring vacuum pump);
(10) crystallization size of microcrystal in the no lattice chamber drum filter inlet sodium cyanide suspension: 〉=15 μ m.
For guaranteeing the ordinary production operation, between no lattice chamber drum filter system and next procedure dehumidification system, be provided with interlocking:
When turning valve shuts down, result in blockage, stop for preventing that dehumidification system from gathering materials, the interlocking action, the dryer feed worm conveyor shuts down, water ring vacuum pump import motorized adjustment butterfly valve is opened emptying, the filter system loss of vacuum, and filter also shuts down simultaneously.
Producing 1.6 ten thousand tons of high-content industry sodium cyanide devices per year in design is example (year working time was by 8000 hours), and technico-economical comparison of the present invention is:
(1) energy consumption: the 0.3MPa steam consumption is 0.3t/h (the horizontal scraper discharging centrifuge system does not consume 0.3MPa steam); Horizontal scraper discharging centrifuge system total power is 63kwh, and drum filter system total power in no lattice chamber is 92.2kwh; 45 yuan/ton of steam tax included prices, 0.53 yuan/kwh of electric tax included price, then per hour running cost increases by 28.98 yuans.
(2) process air consumption: horizontal scraper discharging centrifuge system consumption 1.68m
3/ h, no lattice chamber drum filter system consumption 60m
3/ h (on average), 0.13 yuan/m of process air tax included price
3, then per hour running cost increases by 7.58 yuans.
(3) recirculated cooling water consumption: the horizontal scraper discharging centrifuge system does not consume recirculated cooling water, no lattice chamber drum filter system consumption recirculated cooling water 8m
3/ h, 0.25 yuan/m of recirculated cooling water tax included price
3, then per hour running cost increases by 2.0 yuans.
(4) pure water consumption: the horizontal scraper discharging centrifuge system is suitable with no lattice chamber drum filter system consumption pure water amount, is all 100kg/h.
(5) exhaust gas emission: horizontal scraper discharging centrifuge system non-exhaust emission; No lattice chamber drum filter system has been owing to realized closed cycle production, and also non-exhaust emission is only at instantaneous just have exhaust gas emission, the instantaneous maximum emission 80m of stopping production
3/ min.
(6) table of equipment number: 7 of the total equipment of no lattice chamber drum filter system, equipment volume is little, arranges compactness, and floor space is few; 4 of the total equipment of horizontal scraper discharging centrifuge system, though equipment volume is little, floor space is bigger.
Overall economic efficiency evaluation of the present invention (producing 1.6 ten thousand tons of high-content industry sodium cyanide devices per year with design is example)
1, investment cost:
The horizontal scraper discharging centrifuge system has 4 of equipment (wherein two horizontal scraper discharging centrifuges are from Japanese import), and construction investment reaches 11733189.46 yuans; 7 of the total equipment of no lattice chamber drum filter system, construction investment is 1052226.76 yuans, and both compare, and drum filter system saving investment in no lattice chamber reaches 10680962.7 yuans.
2, production run cost:
Adopt no lattice chamber drum filter system make solid sodium cyanide per hour running cost increase by 38.56 yuan than horizontal scraper discharging centrifuge system, move 8000 hours meters per year, 30.848 ten thousand yuan of year increase running costs.
Do not considering under the situation that import horizontal scraper discharging centrifuge throughput is little and horizontal scraper discharging centrifuge maintaining expense is high, the increase of no lattice chamber drum filter system year production run cost only is equivalent to construction investment and saves 2.89% of the amount of money, simultaneously, obviously reduced evaporating in the preparation process, the requirement of Crystallization Procedure processing parameter and evaporation energy consumption, therefore, from the ratio of performance to price as can be seen, adopt no lattice chamber drum filter system to make the high content of solid sodium cyanide, its overall economic efficiency obviously is better than adopting the horizontal scraper discharging centrifuge system.
Conclusion of the present invention
1, the present invention is used in design and produces per year on 1.6 ten thousand tons of high-contents industry sodium cyanide devices than existing horizontal scraper discharging centrifuge system and can significantly reduce construction investment, the moisture mass percent of moist press cake of discharging after guaranteeing solid-liquid separation is no more than in 10%, satisfies the requirement that production capacity improves.
2, the present invention is owing to adopted close circulation technology, and pollutent waste gas generation seldom meets the requirement of cleaner production.
3, the present solid-liquid separation dehydration technology that is used for high-content industry Sodium Cyanide Production in the world mainly is a horizontal scraper discharging centrifuge technology, no lattice provided by the invention chamber drum filter solid-liquid separating method is the dehydration technique of a kind of advanced person, saving investment, this method not only can promote domestic sodium cyanide industry key equipment production domesticization paces, and has recommended a kind of new method for the solid-liquid separation in the high-content industry Sodium Cyanide Production process.
Claims (2)
1, a kind of solid-liquid separating method for preparing high-content industry sodium cyanide product, the steps include: that the sodium cyanide suspension in the crystallizer extracts out through the crystallization submerged pump, and by sending into no lattice chamber drum filter inner filtration from the bottom after the control feed size, the discharge port filter cake is blown off by blowback pressurized air and enters drying process and further dewater; The filtrate that water ring vacuum pump is extracted out two-stage air water separator before vacuum pump relies on the effect of liquid level difference to fall into the fluid circulation system mother liquid tank, water, technology waste gas that water ring vacuum pump is discharged separate through rearmounted air water separator, technology waste gas forms hot blast and is blown into no lattice chamber drum filter by the top after the airheater heating, filter cake and the filtrate that remains in the filter cake are heated, and the water in the rearmounted air water separator is delivered to water ring vacuum pump and is recycled after the plate-type heat exchanger cooling; The control condition of no lattice chamber drum filter is:
(1) no lattice chamber drum filter inlet sodium cyanide suspension contains solid volume percentage ratio: 2-80%;
(2) no lattice chamber drum filter discharging compression process air flow quantity: 30-180m
3/ h;
(3) no lattice chamber drum filter discharging compression process air pressure: 0.01-0.04Mpa;
(4) interior vacuum tightness: the 20-60kpa of no lattice chamber drum filter rotary drum;
(5) no lattice chamber drum filter rotating speed: 1-20rpm;
(6) no lattice chamber drum filter rotary drum filtering net cleaning way and pure water consumption: continue to clean used pure water consumption 50-100kg/h;
(7) no lattice chamber drum filter filtering net material: high strength heatproof polypropylene or woven dacron;
(8) no lattice chamber drum filter hot blast temperature: 25-250 ℃;
(9) no lattice chamber drum filter hot blast consumption: 500-4800m
3/ h;
(10) crystallization size of microcrystal in the no lattice chamber drum filter inlet sodium cyanide suspension: 〉=15 μ m.
2, solid-liquid separating method according to claim 1 is characterized in that: be provided with interlocking between no lattice chamber drum filter system and next procedure dehumidification system:
When the dehumidification system turning valve shuts down, the interlocking action, the dryer feed worm conveyor shuts down, and water ring vacuum pump import motorized adjustment butterfly valve is opened emptying, and simultaneously, no lattice chamber drum filter also shuts down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410034438 CN1267348C (en) | 2004-04-10 | 2004-04-10 | Solid-liquid separation technique for preparing high assay and industrial solid product of sodium cyanide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410034438 CN1267348C (en) | 2004-04-10 | 2004-04-10 | Solid-liquid separation technique for preparing high assay and industrial solid product of sodium cyanide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1562750A CN1562750A (en) | 2005-01-12 |
| CN1267348C true CN1267348C (en) | 2006-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410034438 Expired - Lifetime CN1267348C (en) | 2004-04-10 | 2004-04-10 | Solid-liquid separation technique for preparing high assay and industrial solid product of sodium cyanide |
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| Country | Link |
|---|---|
| CN (1) | CN1267348C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107376504A (en) * | 2017-09-18 | 2017-11-24 | 四川祥龙生物工程技术有限公司 | Separator |
| CN112588003A (en) * | 2020-12-01 | 2021-04-02 | 南京塔川化工设备有限公司 | Filtering device and filtering method for slag-water mixture generated by gas furnace |
| CN112892087A (en) * | 2021-01-15 | 2021-06-04 | 王建强 | Continuous capture and recovery equipment and method for spray paint mist |
| CN114130102B (en) * | 2021-10-22 | 2024-01-05 | 北京恒泰源盛高科技有限公司 | Vacuum rotary drum filtration system |
| CN115006905B (en) * | 2022-07-08 | 2023-09-29 | 盐城市泉通环保设备有限公司 | High-efficient environmental protection sludge dewatering processing apparatus |
| CN115487531B (en) * | 2022-10-08 | 2024-04-16 | 常州工学院 | Comprehensive treatment device for neutralization crystallization and continuous spin-drying of p-aminophenol |
-
2004
- 2004-04-10 CN CN 200410034438 patent/CN1267348C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1562750A (en) | 2005-01-12 |
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Address after: 246001 Jixian South Road, Anhui, No. (formerly No. 198) turn to 242 Patentee after: ANHUI ANQING SHUGUANG CHEMICAL (Group) Co.,Ltd. Address before: 246001 Jixian South Road, Anhui, No. (formerly No. 198) turn to 242 Patentee before: SHUGUANG CHEMICAL Co.,Ltd. ANQING CITY |
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