Graphite is as a kind of non-metallic material, and all having very widely in a plurality of fields, utilization, particularly its exclusive characteristic have the irreplaceable effect of other materials in fields such as sealing and heat conduction and heat radiations.
Natural graphite is carried out high temperature to expand and just must carry out the material intercalation processing to its sheet interlayer and obtain expansible black lead.Current now way is: in the environment of strong oxidizing property, to carrying out the acid ion intercalation processing between sky combustion graphite flake layer, acid ion is fully injected between the graphite flake layer.Natural graphite behind the acid ion intercalation often is called acidifying graphite, just expansible black lead.The acid ion of expansible black lead (700 ~ 1200 ℃) sheet interlayer when high temperature can fiercely gasify; The bulging force that produces can draw back the interlamellar spacing of natural graphite; Make fierce expansion of volume of expansible black lead; Before all volumes after the expansion can reach and expand 100 ~ 350 times of acidifying graphite volume, have in addition can reach more than 500 times.Graphite quality after the expansion is bulk, and natural graphite is elongated to strip, because of its shape like worm, expanded graphite often is called as graphite worm.Can carry out post-production to expanded graphite,, be widely used in fields such as sealing and heat conduction and heat radiation such as adopting roll compacting or compression molding to process various products.
And prepare in the whole bag of tricks of expansible black lead carrying out acidification for natural stone, adopt the vitriol oil under strong well-oxygenated environment, let sulfate ion (HSO
4 -) to insert the unilateral method of natural graphite the most extensive, and adopt this method cost the most economical, minimum to the pollution level that environment caused, the processing condition of this method are the most ripe simultaneously.
In process of production; Crystalline flake graphite and acid and oxygenant carry out in the reaction kettle that band stirs; The heavy-gravity reaction product adopts the flushing of high speed flowing water to get into flushing tank, and high speed flow water generates siphonage is transported to flushing tank with reaction product, and washing is to neutral in flushing tank; Through centrifuge dehydration, drying obtains expansible black lead then.There is following defective in this technology: 1, owing to adopt the flushing of high speed flowing water, it is on the low side to wash residual acid concentration, and no recovery value pollutes environment; 2, temperature of charge is not easy control in the flushing process, causes unstable product quality; 3, will use a large amount of bath wateies, and waste water and cause huge environmental stress.
Summary of the invention
The utility model technical problem to be solved provides a kind of continuous expansible black lead production equipment; Be easy to control and soak acid strength, be convenient to carry out segmentation depickling dehydration, waste acid recycling soaking product; Waste water gets into treatment tank; Complete assembly can be realized robotization, serialization production, and the production line that in follow-up purification operation, can extend, and realizes graphite purifying, graphite acidifying continuous production.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of continuous expansible black lead production equipment, comprise reaction kettle, and reaction kettle has blanking groove, and the blanking groove below is provided with jet pipe;
Jet pipe one end is connected with air compressor machine, and the other end is communicated with first relay tank, and blanking groove is communicated with jet pipe through U trap;
The first relay tank discharge port is communicated with the opening for feed of first belt vacuum filter.
The discharge port of described first belt vacuum filter is communicated with second relay tank, and the discharge port of second relay tank is communicated with the opening for feed of second belt vacuum filter.
Be provided with hydrofluoric acid solution in described second relay tank.
Described first relay tank and second relay tank also are provided with spiral coil cooling tube.
Material moisture after described first belt vacuum filter and second belt vacuum filter are handled is lower than 30%.
First belt vacuum filter and second belt vacuum filter are the Pyatyi treating processes, and the first step is the suction acidic solution, and level Four is drip washing in addition.
The air pressure that described air compressor machine produces is 0.3-1MPa.
A kind of continuous expansible black lead production equipment that the utility model provides adopts special relay tank washing by soaking reaction mass, soaks acid strength thereby be easy to control; Adopt vacuum to take off filter and carry out segmentation depickling dehydration soaking material; Waste acid recycling, waste water gets into treatment tank, and complete assembly can be realized robotization, serialization production; And the production line that in follow-up purification operation, can extend is realized graphite purifying, graphite acidifying continuous production.The utility model beneficial effect is: the reaction acid-spending strength is controlled; Temperature of reaction is controlled; The bath water amount significantly reduces, and reduces discharging; Level of automation is high, has improved production efficiency.
As shown in fig. 1, a kind of continuous expansible black lead production equipment comprises reaction kettle 1, and reaction kettle 1 has blanking groove 2, and blanking groove 2 belows are provided with jet pipe 3;
Jet pipe 3 one ends are connected with air compressor machine 5, and the other end is communicated with first relay tank 6, and blanking groove 2 is communicated with jet pipe 3 through U trap 4;
First relay tank, 6 discharge ports are communicated with the opening for feed of first belt vacuum filter 8.Vacuum is taken off filter and is adopted the belt vacuum to take off filter.
The discharge port of described first belt vacuum filter 8 is communicated with second relay tank 9, and the discharge port of second relay tank 9 is communicated with the opening for feed of second belt vacuum filter 10.
Be provided with hydrofluoric acid solution in described second relay tank 9.Usually adopt the hydrofluoric acid solution of volumetric molar concentration 30-55% to handle.
Described first relay tank 6 and second relay tank 9 also are provided with spiral coil cooling tube 7.Spiral coil cooling tube 7 is used for logical water coolant or hot water, with controlled temperature.
Material moisture after described first belt vacuum filter 8 and second belt vacuum filter 10 are handled is lower than 30%.
First belt vacuum filter 8 and second belt vacuum filter 10 are the Pyatyi treating processes, and the first step is the suction acidic solution, and level Four is drip washing in addition.
The air pressure that described air compressor machine 5 produces is 0.3-1MPa.
Adopt air-flow siphonage transfer of highly viscous acidifying graphite material in the utility model, acidifying graphite material soaks dilution through first relay tank 6, and relay tank adopts the modified poly ethylene can; Assembling spiral coil cooling tube 7 can feed cold water or hot water in jar, control flushing temperature; Take off the filter washing through the belt vacuum after the material cooling; Collect spent acid waste water and handle respectively, the expansible black lead after the washing perhaps further carries out the back purification processes, or convection drying obtains the expansible black lead finished product.
In the utility model device, high pressure draft siphoning installation, relay tank, belt vacuum are taken off filter and are used the core that constitutes this device, and its function of the combination of these devices is supported mutually, thereby the automated job of realization acidifying graphite material has improved production efficiency.
Specifically, adopt the device of the utility model to operate as follows:
1, crystalline flake graphite, sulfuric acid, oxygenant are measured stirring reaction in the proportioning reaction kettle 1 by certain chemistry, the proportioning between the various materials is a prior art;
2, after reaction was accomplished, upset reaction kettle 1 was poured reacted sticky shape material into blanking groove 2; Blanking groove 2 has certain tilt internal wall; Material utilizes the gravity trickling, and at tip designs one U trap 4 of blanking groove, U trap 4 is connected with jet pipe 3 negative pressure end interfaces;
3, jet pipe 3 main pipe lines and mass transport pipe coupling are introduced first relay tank 6 with tail wind, and material is stirred cooling;
4, during blanking, start air compressor machine 5, blast reach 0.3-1MPa, the employing 0.3-0.5 MPa of optimization in the jet pipe 3.Through the control blast, can adjust blanking velocity.Because material is a vitriol oil mixture, material flows in first relay tank 6, first relay tank, 6 splendid attire washing water; Vitriol oil mixture mixes with water will produce a large amount of heat, if blanking is too fast, and will elevated temperature; Elevated temperature causes disadvantageous effect to expansible black lead quality stability; Therefore, utilize the negative pressure adjustability, control the temperature in first relay tank 6 thereby can control blanking velocity;
5, material flows into transfer lime in blanking groove 2 under little suction function and self gravitation effect that jet pipe 3 forms, and transfer lime has certain inclination, and material will utilize self gravitation to trickle naturally along slick transfer lime, get into first relay tank 6.
6, be designed with stirring rake and spiral coil cooling tube 7 in first relay tank 6; Spiral coil cooling tube 7 is introduced cooling circulating water along the coiling of first relay tank, 6 tank skins in the spiral coil cooling tube, regulate the relay tank temperature on the one hand; In addition; Relay tank is a plastic cement products, introduces water coolant, is beneficial to protection first relay tank 6 tank wall materials.
7, material washs in first relay tank 6, adjusts first relay tank, 6 water yields, controlling acidity;
8, treat that temperature is reduced to 35 ± 5 ℃ in first relay tank 6, the baiting valve of first relay tank 6 opened that material flows to first belt vacuum filter 8 and carries out the depickling carrying out washing treatment according to certain flow;
9,8 fens Pyatyi washing process of first belt vacuum filter, one-level is mainly aspirated than concentrated acid water, and concentrated acid water carries out the purifying treatment reuse; Level Four is drip washing in addition, collects waste water and carries out the Unified Treatment recycling;
10, the material moisture of handling through first belt vacuum filter 8 is controlled in 30%, and this mainly realizes through rotating speed and the vacuum tightness of controlling first belt vacuum filter 8.
11, after the material collection, can carry out next step operation, if the crystalline flake graphite raw material is a high-carbon graphite, by truck 11 or directly entering oven dry operation; If crystalline flake graphite is a medium-carbon graphite, perhaps need be further purified processing, material will get into second relay tank 9, add hydrofluoric acid treatment;
12, same design spiral coil cooling tube 7 in second relay tank 9 is introduced hot water or cold water, with the conditioned reaction temperature in the spiral coil cooling tube 7;
13, after reaction was accomplished, temperature was reduced to 35 ± 5 ℃ in second relay tank 9, and second relay tank, 9 baiting valves are opened, and material flows to second belt vacuum filter 10 and carries out the depickling carrying out washing treatment according to certain flow;
14,10 fens Pyatyi washing process of second belt vacuum filter, one-level is mainly aspirated than concentrated acid water, and concentrated acid water carries out the purifying treatment reuse; Level Four is drip washing in addition, collects waste water and carries out the Unified Treatment recycling;
15, the material moisture of handling through second belt vacuum filter 10 is controlled in 30%, and this major control belt vacuum is taken off filter rotating speed and vacuum tightness.Material can carry out next step operation after collecting with truck 11.