CN1301776C - Filtration and washing technology in preparing metal or non metal fine granular powder - Google Patents
Filtration and washing technology in preparing metal or non metal fine granular powder Download PDFInfo
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- CN1301776C CN1301776C CNB2005100561666A CN200510056166A CN1301776C CN 1301776 C CN1301776 C CN 1301776C CN B2005100561666 A CNB2005100561666 A CN B2005100561666A CN 200510056166 A CN200510056166 A CN 200510056166A CN 1301776 C CN1301776 C CN 1301776C
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Abstract
The present invention discloses a filtering and washing technology for preparing metal or nonmetal fine granular powder, which comprises the steps of filtration, washing, filter cake drying, discharging and filter cleaning. The present invention is characterized in that a precise millipore filter provided with at least two filtering regions is used for the filtration to respectively filter up and down in different regions; in washing, washing liquid is firstly reversely blown to drop a filter cake on a millipore filter plate on an end layer, compressed air is then instantaneously and reversely blown for many times, and the filter cake and the washing liquid are stirred into uniform heterodisperse slurry to respectively filter in different regions; when the powder is rigid spherical granules, stirring is not needed in washing. The present invention has the advantages that defects of the penetrating filtration of fine powder are overcome, the yield of the fine powder is improved, the structure of filtering equipment is simple, the filtering area is big, a processing capacity is large, filtering and washing efficiency is improved, and the consumption of the washing liquid is little.
Description
Technical field
The present invention relates to a kind of filtration and washing process, particularly a kind of technology that adopts precise microporous filter to filter and wash in metal or the filtration of nonmetal fine granular powder for preparing.
Background technology
In industrial production such as chemical industry, metallurgy, especially new material production must quite thin metal or the non-metallic powder of a large amount of preparation particles, especially superfine powder.Among the preparation technology, the liquid-solid filtration of powder and washing are indispensable unit operations.Industrial production has following two classes to filter and washing technology at present.One class is a conventional art, will filter with washing and carry out in two different devices, and generally these filters and wash mill all are conventional apparatus; Slip filters earlier, to filter filter cake then and throw into the wash mill agitator treating from the filter taking-up, to wash slip behind the agitator treating again and get to filter and carry out the second time and filter, so the agitator treating of filtration → agitator treating → refilter → again ..., carry out repeatedly.The technical difficulty of this filtration and washing is low, and cleaning solution is low-consuming, but operates very trouble, and workload is very big.Second class is to finish the technology that filtration, washing, filter cake press dry in a device.As being to filter and wash in the gap vacuum of filter medium or the pressing filter with the filter cloth.If treating capacity is big, then adopt traditional vertical tube type, vertical vane, vertical sheet frame or chamber filter press.The filter area of these gap filters is bigger, and disposal ability is also big.Weak point: the one, be that filter medium fine powder body is worn filter easily, loss is big with the filter cloth; The 2nd, vertical installation, cake layer is in uneven thickness up and down for filter medium, makes that washing is inhomogeneous, in order to guarantee clean result, often needs a large amount of cleaning solutions.And multilayer horizontal blade filter or the box filter of multilayer level, advantage is the detersive efficiency height, uses cleaning solution few, but expects dried filter cake at last, device is quite complicated again.Also have many enterprises to adopt easy horizontal vacuum suction strainer or horizontal pressure filtration technology, though apparatus structure is simple, but have only one to be the horizontal filtering plate of filter medium with the filter cloth, filter area is little, and disposal ability is low, and fine powder is easily worn filter, and the filter cake cracking appears during washing easily, make cleaning solution walk short circuit, cause a large amount of cleaning solution wastes, product quality be cannot say for sure to demonstrate,prove; Moreover vacuum suction filter is little owing to pressure reduction, and the rate of filtration is very slow, makes production efficiency not high.In sum, up to the present, in preparation fine granular powder process,, make in filtration and the washing to have many defectives because used filtration and washing facility are undesirable.
Summary of the invention
The objective of the invention is in order to overcome above-mentioned deficiency, propose a kind of technology that adopts precise microporous filter to filter and wash in preparation metal or the filtration of nonmetal fine granular powder, make filtration, washing operation conveniently, efficient improves, cleaning solution consumption reduces, and the powder yield improves.
In order to achieve the above object, the present invention prepares the filtration and the washing process of metal or nonmetal fine granular powder, and processing step comprises that filtration, washing, filter cake dry up, arrange and unload filter cake, filter cleaning; Described filtration adopts the precise microporous filter that is provided with at least two filtration zones to carry out, and the end layer filtering area filter medium of this precise microporous filter is the rigidity micro-porous filtration plate that is horizontally fixed on the described filter bottom upper port card; Filtration step is as follows: the slip that will contain metal or nonmetal fine granular powder then descends the subregion to filter respectively with being pumped into to go up earlier in the precise microporous filter, after first floor filtration zone filters and finishes, earlier be pressed into compressed air through purifying from the filter drain, after stop shurry pump, start following each layer filtration zone more successively respectively and will remain slurry filtration, finish until all slurry filtrations, filter cake is pressed dry finish to filter.
Washing step of the present invention is as follows:
A. start the cleaning solution delivery pump, oppositely be pressed into cleaning solution from end layer filtering area rigidity micro-porous filtration plate earlier last metafiltration cake is dashed pine, filter medium from other filtering area oppositely is pressed into cleaning solution again, the recoil of filter cake on it is dropped on the layer rigidity micro-porous filtration plate of end, close the cleaning solution delivery pump, to the instantaneous blowback several times of all filter mediums, open filter top drain with compressed air simultaneously, the interior gas of machine is in time discharged;
B. the stirring arm that starts adjustable speed passes through the cleaning solution agitator treating to end all filter cake of layer, and block filter cake is broken up, and makes filter cake and cleaning solution form uniform heterogeneous dispersion slip, stops to stir;
C. being pressed into compressed air from filter top drain makes heterogeneous dispersion slip subregion be filtered to all slurry filtrations respectively to finish, press dry filter cake;
D. till repeating above-mentioned A, B, three step several times of C to filter cake washing quality and reaching requirement.
The present invention is the spheric granules of rigidity for powder, does not adopt agitator treating during washing, and step is as follows:
E. start the cleaning solution delivery pump, oppositely be pressed into cleaning solution from all filtering area filter mediums all filter cake recoils are dropped on the rigidity micro-porous filtration plate of end layer filtering area, close the cleaning solution delivery pump;
F. be pressed into compressed air from the filter drain cleaning solution is discharged from last metafiltration liquid outlet, when the cleaning solution liquid level is reduced to cake layer, close source of the gas;
G. till repeating two step several times of E, F to filter cake washing quality and reaching requirement.
Rigidity micro-porous filtration plate of the present invention is provided with some height less than 10 centimeters rigidity microfiltration tube.
The present invention is because in preparation metal or nonmetal fine granular powder process, adopt precise microporous filter to carry out subregion filtration and washing to containing the fine granular powder slip, overcome slip and worn the drawback of filter, improved the fine powder yield, owing to be provided with at least two layers of filtering area, filter filter area than existing equal volume increases, and treating capacity increases, and filtration, detersive efficiency are improved; Owing to during washing, the equal blowback of all filter cakes at the bottom filtering area, is carried out agitator treating, it is inhomogeneous to have overcome existing vertically passing filter medium washing, needs the defective of a large amount of cleaning solutions, and cleaning solution consumption is reduced; Compare with the filtration washing technology of using multilayer horizontal blade filter or the box filter of multilayer level, the structure of precise microporous filter is fairly simple again; Setting up height on the horizontal stiffness micro-porous filtration plate makes filter area obtain increasing the corresponding filtering rate that improved less than 10 centimeters microporous pipe; Compare with easy horizontal vacuum suction strainer or horizontal pressure filtration, its filter area is big, and disposal ability is big.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is the structural representation of the precise microporous filter in the embodiment of the invention 1;
Fig. 3 is the structural representation of the precise microporous filter in the embodiment of the invention 2;
Fig. 4 is the annexation enlarged drawing of rigidity microfiltration tube 16 and rigidity micro-porous filtration plate 22, card 21 among Fig. 2.
The specific embodiment
As shown in Figure 1, the filtration of preparation metal of the present invention or nonmetal fine granular powder and washing process comprise with lower device: powder slurry tank 1, pump 2, precise microporous filter 3, cleaning solution basin 4, air compressor 5, air purifier 6, air reservoir 7, pressure-reducing valve 8.Precise microporous filter 3 is capital equipments of this technology, shown in Fig. 2,3, it comprises buncher 9, stirring arm 10, top cover 11, drain 12, rigidity microfiltration tube 13,16, feed slurry inlet 14, cylinder or hydraulic cylinder 15, locking bail 17, bottom 18, support arm 19, filtrate (liquid 20, card 21, rigidity micro-porous filtration plate 22, rigidity micro porous filtration Conical Shells With 23.Rigidity microfiltration tube 13 is formed first floor filtering area, and rigidity micro porous filtration Conical Shells With 23 is formed the middle level filtering area, and rigidity microfiltration tube 16 and rigidity micro-porous filtration plate 22 are formed end layer filtering area.Rigidity micro-porous filtration plate 22 is fixed on the card 21 of bottom 18 upper port, and rigidity microfiltration tube 16 height are less than 10 centimeters, and it and filter 22 are formed composite filter media, and as shown in Figure 3, both can be for integral sintered; Also can distinguish sintering and fix with screw rod, nut and filter 22, card 21 again, as shown in Figure 4.The purpose of setting up rigidity microfiltration tube 16 is to increase the bottom filter area, to reduce the bottom cake filtration time, improves filter efficiency.In order to guarantee bottom washing filter cakes efficient,, select best screen pipe height and filter area according to bottom filter material volume and filter cake volume.Precise microporous filter shown in Figure 2 is provided with three filtration zones, be applicable to that the powder handling amount is big, require the filtration and the washing of the big powder slip of filter area and filter diameter, certainly, the bottom filter area is enough, also microfiltration tube 16 can be set.Precise microporous filter shown in Figure 3 only is provided with head, two filtration zones in end, be applicable to that the powder handling amount is few, the filtration and the washing of the powder slip that required filter area and filter diameter are less, same, on the micro-porous filtration plate microfiltration tube 16, filter as shown in Figure 1 can be set.The filter medium of filter for by high molecular polymer or metal or inorganic matter by sintering or bonding or pad is pressed or methods such as wrapping wire are made rigidity microporous filter media, also can be by hole order number very big metal or nonmetallic filter cloth, the filter medium that certain rigidity is arranged that filter screen is made.To slip or the cleaning solution that corrosion is arranged, then there is the contact site all should serve as a contrast the anticorrosive coat protection with it in the machine; The casing side has several filter cake sample taps, with timely understanding filter cake washing quality; Manhole, hand hole all can be left in filter top cover or side, with convenient install, maintenance and to cleaning in the machine.The maximum characteristics of this precise microporous filter are that the fine powder body greater than 0.5 micron all can not be worn filter in the slip, and fine powder body yield is high especially, and filter area is big, and treating capacity is just big, and the cleaning solution consumption is few.
The technological process of the embodiment of the invention 1 is as follows:
1. filter: the slip of containing metal or nonmetal fine granular powder is pressed into the precise microporous filter 3 by pump 2 from powder slurry tank 1, the precise microporous filter 3 of present embodiment as shown in Figure 2, slip filters by the precise microfiltration pipe 13 of first floor filtering area earlier, after filtering end, be pressed into 0.1～0.3MPa compressed air that process purifies from filter drain 12, by this low-pressure air slip in the machine is continued to filter at first floor filtering area, when slurry level in the machine is reduced to the first floor can't filter the time, close first floor filtering area, the rigidity micro porous filtration Conical Shells With 23 of enabling the middle level continues to filter, when slurry level is reduced to the middle level and can't be filtered, close the middle level filtering area, start the rigidity micro-porous filtration plate 22 of end layer filtering area, microfiltration tube 16 composite filter medias continue to filter, and finish up to slurry filtration.
2. washing: start cleaning solution delivery pump 2 and oppositely be pressed into cleaning solution from the rigidity micro-porous filtration plate 22 of end layer filtering area earlier the filter cake on lower floor's filter is blown pine, again from the first floor, the middle level filter medium oppositely pumps into cleaning solution, filter cake blowback on it is dropped on the layer filter of end, close the cleaning solution delivery pump, with the instantaneous blowback several times of the compressed air of 0.3～0.6MPa, filter cake is come off fully, unclamp, simultaneously, open drain 4, the interior gas of machine is in time discharged, start stirring arm 10, all filter cakes of lower floor are disperseed to form uniform heterogeneous dispersion slip by the cleaning solution agitator treating, stop to stir, the compressed air that is pressed into 0.1～0.3MPa from filter drain 12 finishes heterogeneous dispersion slip layered filtration to all slurry filtrations, press dry filter cake.Repeating above washing step several times takes out the filter cake analysis to the slave and reaches till the washing quality requirement;
3. dry up: till being pressed into compressed air the bottom filter cake is dried up from filter drain 12;
4. row unloads filter cake: open filter bottom 18 by cylinder or hydraulic cylinder 15, by each layer of compressed air blowback screen pipe, plate, the filter cake blowback is dropped in the outer vessel of machine.
5. filter physics or Chemical cleaning: it is that heat or cold clear water blowback are gone into each layer filter medium that physical method cleans, and again each layer filter medium is gone in the compressed air blowback, is circulated to filter medium regeneration so repeatedly and finishes.After filter is through the long duration running, filter medium resistance increases, in the time of can't continuing to filter, can adopt chemical method to clean, during Chemical cleaning, Chemical cleaning fluid cylinder (not shown) and filter 3 carry out sealing and circulating, and decide according to different powder properties circulation timei, after cleaning end, clean in order to using again next time with clear water again.
The technological process of the embodiment of the invention 2 is as follows:
1. filter: the filtration of present embodiment 2 and washing employing precise microporous filter as shown in Figure 3, be provided with head, two filtration zones in end, its filtration step method is similar to embodiment 1, has just lacked the middle level filtering area, here no longer narration.
2. washing: start the cleaning solution delivery pump, from the cleaning solution that oppositely is pressed into of two filtration zone filter mediums the filter cake blowback is dropped on the layer filter of end, close the cleaning solution delivery pump, because the powder of present embodiment is the spheric granules of rigidity, therefore do not need agitator treating, can directly be pressed into 0.1～0.3MPa compressed air from drain 12, cleaning solution is drained from end layer row filtrate port 20, when the cleaning solution liquid level is reduced to the cake layer surface, close source of the gas, in case filter cake overdrying cracking, finish washing for the first time, repeat above washing step several times, reach requirement after testing to the filter cake quality till, stop the washing.
Below dry up, arrange unload filter cake, filter cleaning and regeneration step is identical with embodiment 1, no longer repeat here.
Claims (3)
1, a kind of filtration and washing process for preparing metal or nonmetal fine granular powder, processing step comprises that filtration, washing, filter cake dry up, arrange and unload filter cake, filter cleaning, it is characterized in that: described filtration adopts the precise microporous filter (3) that is provided with at least two filtration zones to carry out, and the end layer filtration zone medium of this precise microporous filter (3) is for being horizontally fixed on the rigidity micro-porous filtration plate (22) on described filter bottom (18) the upper port card (21); Described filtration step is as follows: the slip that will contain metal or nonmetal fine granular powder is pressed into to go up earlier in the precise microporous filter (3) with pump (2) and then descends the subregion to filter respectively, after first floor filtration zone filters and finishes, earlier be pressed into 0.1～0.3MPa compressed air through purifying from filter drain (12), after stop shurry pump (2), start following each layer filtration zone more successively respectively and will remain slurry filtration, finish until all slurry filtrations, filter cake is pressed dry finish to filter; Described washing step is as follows:
A. start cleaning solution delivery pump (2), oppositely be pressed into cleaning solution from end layer filtering area rigidity micro-porous filtration plate (22) earlier last metafiltration cake is dashed pine, filter medium from other filtering area oppositely is pressed into cleaning solution again, the recoil of filter cake on it is dropped on the end layer rigidity micro-porous filtration plate (22), close cleaning solution delivery pump (2), to the instantaneous blowback several times of all filter mediums, open filter top drain (12) with 0.3～0.6MPa compressed air simultaneously, the interior gas of machine is in time discharged;
B. the stirring arm (10) that starts adjustable speed passes through the cleaning solution agitator treating to end all filter cake of layer, and block filter cake is broken up, and makes filter cake and cleaning solution form uniform heterogeneous dispersion slip, stops to stir;
C. from filter top drain, (12) are pressed into 0.1～0.3MPa compressed air and make heterogeneous dispersion slip subregion be filtered to all slurry filtrations respectively to finish, press dry filter cake;
D. till repeating above-mentioned A, B, three step several times of C to filter cake washing quality and reaching requirement.
2, the filtration and the washing process of preparation metal according to claim 1 or nonmetal fine granular powder is characterized in that described rigidity micro-porous filtration plate (22) is provided with the rigidity microfiltration tube (16) that some height are 10 centimeters.
3, a kind of filtration and washing process for preparing metal or nonmetal fine granular powder, processing step comprises that filtration, washing, filter cake dry up, arrange and unload filter cake, filter cleaning, it is characterized in that: described filtration adopts the precise microporous filter (3) that is provided with at least two filtration zones to carry out, and the end layer filtration zone medium of this precise microporous filter (3) is for being horizontally fixed on the rigidity micro-porous filtration plate (22) on described filter bottom (18) the upper port card (21); Described filtration step is as follows: the slip that will contain metal or nonmetal fine granular powder is pressed into to go up earlier in the precise microporous filter (3) with pump (2) and then descends the subregion to filter respectively, after first floor filtration zone filters and finishes, earlier be pressed into 0.1～0.3MPa compressed air through purifying from filter drain (12), after stop shurry pump (2), start following each layer filtration zone more successively respectively and will remain slurry filtration, finish until all slurry filtrations, filter cake is pressed dry finish to filter; Described washing step is as follows:
E. start the cleaning solution delivery pump, oppositely be pressed into cleaning solution from all filtering area filter mediums all filter cake recoils are dropped on the rigidity micro-porous filtration plate (22) of end layer filtering area, close the cleaning solution delivery pump;
F. be pressed into 0.1～0.3MPa compressed air from filtration drain (12) and make cleaning solution export (20) discharge, when the cleaning solution liquid level is reduced to cake layer, close source of the gas from last metafiltration liquid;
G. till repeating two step several times of E, F to filter cake washing quality and reaching requirement.
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| CNB2005100561666A CN1301776C (en) | 2005-03-22 | 2005-03-22 | Filtration and washing technology in preparing metal or non metal fine granular powder |
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| CNB2005100561666A CN1301776C (en) | 2005-03-22 | 2005-03-22 | Filtration and washing technology in preparing metal or non metal fine granular powder |
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| CN1301776C true CN1301776C (en) | 2007-02-28 |
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| CN104858415B (en) * | 2015-04-23 | 2017-03-01 | 金川集团股份有限公司 | A kind of washing methods of super fine silver powder |
| CN106621513A (en) * | 2016-09-21 | 2017-05-10 | 北京化工大学 | Filter-element dispersed filtering device and method for preparing inorganic material |
| CN108465282B (en) * | 2018-05-31 | 2024-05-07 | 浙江东瓯过滤机制造有限公司 | Filtering and washing device and filtering and washing process for ternary precursor small particles |
| CN109107221A (en) * | 2018-08-21 | 2019-01-01 | 金发科技股份有限公司 | A kind of liquid-solid extraction purification devices and purification process |
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| CN114378041A (en) * | 2022-02-11 | 2022-04-22 | 陈惠玲 | Novel washing equipment and washing method for powdery material and slurry |
| CN114768377A (en) * | 2022-05-06 | 2022-07-22 | 苏州永峰联环保科技有限公司 | Compact high-speed solid-liquid separation filter |
| CN114892022B (en) * | 2022-05-07 | 2024-05-28 | 赣州寒锐新能源科技有限公司 | Treatment system and process for separating fine matters from wet smelting cobalt-copper solution |
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| KR20040077038A (en) * | 2003-02-27 | 2004-09-04 | 주식회사 금강고려화학 | The treatment of residual fine particles from direct process manufacture of methylchlorosilane |
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| KR20040077038A (en) * | 2003-02-27 | 2004-09-04 | 주식회사 금강고려화학 | The treatment of residual fine particles from direct process manufacture of methylchlorosilane |
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