CN106925418B - A kind of apparatus system and method for chromium slag washing - Google Patents
A kind of apparatus system and method for chromium slag washing Download PDFInfo
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- CN106925418B CN106925418B CN201511019466.7A CN201511019466A CN106925418B CN 106925418 B CN106925418 B CN 106925418B CN 201511019466 A CN201511019466 A CN 201511019466A CN 106925418 B CN106925418 B CN 106925418B
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- centrifuge
- hollander tub
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- chromium slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
Abstract
The invention discloses a kind of apparatus systems and method for chromium slag washing, comprising: flocculant storage tank；Multi-stage washing device, end wash mill include hollander tub and filter press, remaining every grade wash mill includes hollander tub and centrifuge；Centrifuge is connected to flocculant storage tank and hollander tub respectively；Wherein the liquid-phase outlet of centrifuge is connected to the hollander tub in upper level wash mill in every grade of wash mill, and solid-phase outlet is connected to the hollander tub in next stage wash mill；The liquid-phase outlet of filter press is connected to the hollander tub in upper level wash mill；Hollander tub is connected to the feeding inlet of filter press in the wash mill of end；Wherein, the hollander tub that first order wash mill is added in chromium slag is pumped into corresponding centrifuge after being beaten；The solid-phase outlet of filter press is connected to chromium slag collection device in the wash mill of end.The present invention realizes the continuous operation of containing chromium slag washing, reduces energy consumption, reduces containing chromium slag harmless treatment difficulty, and makes chromium band damage≤0.5ppm after chromic wastes disposal.
Description
Technical field
Chromium salt production field of the present invention, in particular to a kind of apparatus system and side for chromium slag washing in chromium salt production
Method.
Background technique
Chromate is important inorganic chemical industry basic material, for producing sodium dichromate (potassium), chromic anhybride, chromium oxide, gold
Belong to the products such as chromium.Chromium compound is widely used in the industries such as chemical industry, metallurgy, pigment, tanning, printing and dyeing, plating, medicine.19th century
In the later period, as the growth of soda ash yield, the reduction of price, potassium bichromate and potassium chromate are replaced by corresponding sodium salt, chromic salts is raw
Production. art is gradually improved, and principle process retains always so far.Roasting apparatus is also by manually operated back fire kiln, gradually through capstan kiln
And ring kiln development is the rotary kiln still generallyd use so far.For the knot kiln disadvantage for overcoming single lime filler material, in technique
From single filler material, develop into the composite filler that dolomite adds lime stone and return slag, general designation has calcium roasting, but has calcium roasting
It is big to burn waste residue amount, 2.5~3.0 tons of waste residues of product output per ton, conventional washing technique washing is not thorough, slag band damage 15%~
25%, cause chromium resource waste and rear end containing chromium slag harmless treatment difficulty big.
It is big due to there is calcium roasting to produce the quantity of slag, and contain the calcium chromate of water-insoluble in slag, it is difficult to Detoxified treatment pollutes ring
Border is extremely serious.External most of chromium salt production big country has calcium to roast work with calcium-free roasting technique instead of traditional at present
Skill.Chromium slag and the promotor that is not quite similar of the calcium-free roasting by sorting make filler material, do not generate calcium chromate substantially, in furnace charge
The total chromium of effective component is improved, and the technical-economic indexes such as yield, energy consumption, production cost, production quantity of slag have been substantially better than calcium roasting
Technique, it has also become the Main Trends of The Development of chromium salt production.0.8~1.5 ton of calcium-free roasting product output waste residue per ton, slag band damage chromium
10%~15%.
Chrome Salt Industry is studying liquid phase oxidation technique and is preparing chromic salts product at present, which has height compared with roasting technique
The advantages that effect, energy conservation, cleaning.0.8 ton of product output waste residue per ton, slag band damages chromium 10%~15%.
For the above chromium salt production method there are same problem, i.e., it is low that traditional containing chromium slag washing methods washs the degree of automation, and 2
Secondary mashing washing difficulty greatly can not continuous operation, energy consumption is high, and filter press is mostly used to carry out carrying out washing treatment, and washing is not thorough,
It causes chromium resource to waste, and increases containing chromium slag harmless treatment difficulty.
Summary of the invention
As various extensive and careful research and experiment as a result, it has been found by the inventor that using multistage
Wash mill, and replace filter press to carry out the carrying out washing treatment of chromium slag with centrifuge, it can be realized continuous washing and chromium band damage be small
In 0.5ppm.Based on this discovery, the present invention is completed.
It is excellent it is an object of the invention to solve at least the above problems and/or defect, and provide at least to will be described later
Point.
In order to realize these purposes and other advantages according to the present invention, a kind of device system for chromium slag washing is provided
System, comprising:
Flocculant storage tank；
Multi-stage washing device, end wash mill include hollander tub and filter press, remaining every grade wash mill includes
Hollander tub and centrifuge；The feeding inlet of the centrifuge is connected to hollander tub corresponding in flocculant storage tank and every grade respectively；Its
In in every grade of wash mill the liquid-phase outlet of centrifuge be connected to the hollander tub in upper level wash mill, solid-phase outlet with it is next
Hollander tub connection in grade wash mill；The liquid-phase outlet of the filter press is connected to the hollander tub in upper level wash mill；
Hollander tub is connected to the feeding inlet of filter press in the end wash mill；Wherein, beating for first order wash mill is added in chromium slag
Stock tank is pumped into corresponding centrifuge after being beaten；The liquid-phase outlet of the centrifuge of first order wash mill is connected to chromic salts product
Production line；The solid-phase outlet of filter press is connected to chromium slag collection device in the wash mill of end；Hollander tub in the wash mill of end
It is connected to water supply device.
Preferably, the multi-stage washing device is Pyatyi wash mill comprising:
First order wash mill comprising the first hollander tub and the first centrifuge；The feeding inlet of first centrifuge point
It is not connected to the flocculant storage tank and the first hollander tub；The first conveying of connection between first hollander tub and the first centrifuge
Pump；
Second level wash mill comprising the second hollander tub and the second centrifuge；The feeding inlet of second centrifuge point
It is not connected to the flocculant storage tank and the second hollander tub；The liquid-phase outlet of second centrifuge and first hollander tub connect
It is logical；Second hollander tub is connected to the solid-phase outlet of first centrifuge；Second hollander tub and the second centrifuge it
Between connect the second delivery pump；
Third level wash mill comprising third hollander tub and third centrifuge；The feeding inlet of the third centrifuge point
It is not connected to the flocculant storage tank and third hollander tub；The liquid-phase outlet of the third centrifuge and second hollander tub connect
It is logical；The third hollander tub is connected to the solid-phase outlet of second centrifuge；The third hollander tub and third centrifuge it
Between connect third delivery pump；
Fourth stage wash mill comprising the 4th hollander tub and the 4th centrifuge；The feeding inlet of 4th centrifuge point
It is not connected to the flocculant storage tank and the 4th hollander tub；The liquid-phase outlet and the third hollander tub of 4th centrifuge connect
It is logical；4th hollander tub is connected to the solid-phase outlet of the third centrifuge；4th hollander tub and the 4th centrifuge it
Between connect the 4th delivery pump；
Level V wash mill comprising the 5th hollander tub and filter press；The feeding inlet of the filter press and the described 5th
Hollander tub connection；The liquid-phase outlet of the filter press is connected to the 4th hollander tub；5th hollander tub and filter press it
Between connect the 5th delivery pump；
Wherein, corresponding first centrifuge is pumped into after being beaten in the first hollander tub of chromium slag addition；First centrifuge
Liquid-phase outlet is connected to chromic salts product line；The solid-phase outlet of filter press is connected to chromium slag collection device；5th hollander tub connects
It is connected to water supply device.
Preferably, the centrifuge is sedimentation centrifuge.
Preferably, the sedimentation centrifuge is horizontal type screw settling conveyer centrifugal or vertical centrifuger with spiral discharge.
Preferably, the filter press is horizontal plate and frame filter press.
Preferably, flocculant delivery pump is connected between the flocculant storage tank and centrifuge.
The present invention also provides a kind of methods using the above-mentioned apparatus system washing chromium slag for chromium slag washing, comprising:
The first hollander tub in multi-stage washing device is added in chromium slag, and inputs the liquid solution after the centrifugation of next stage centrifuge；
After being beaten in the first hollander tub, slurry is delivered to centrifuge, and flocculant is added by flocculant delivery pump, adjusts centrifugation
Machine feed rate and centrifugal motor frequency make to be separated by solid-liquid separation, and liquid phase clear liquid is that feed liquid containing chromium is conveyed as chromic salts products material liquid
To chromic salts product line, solid phase slag, which enters next stage hollander tub while next stage wash water is added, to be beaten, after mashing
Slurry inputs centrifuge, and adjusting centrifugation unit frequency makes to be separated by solid-liquid separation, and liquid phase clear liquid inputs upper one as upper level washing wash water
Grade hollander tub, solid phase slag enters next stage hollander tub, while next stage wash water is added and is beaten；It repeats the above steps to containing chromium
Slag chromium band damage≤0.5ppm, the wash water of hollander tub comes from supply equipment in the wash mill of end, and solid-liquid separating equipment selects sheet frame
Filter press, liquid phase inputs upper level hollander tub as upper level wash water after separation, and pack carries out harmlessness disposing after solid phase drying.
Preferably, the solid concentration that feed liquid is beaten in the hollander tub of the multi-stage washing device is 30%.
Preferably, the flocculant is cationic, anionic, non-ionic macromolecular organic flocculant, is added
Amount is 0.1 ‰~5 ‰ of slurries total amount in input centrifuge；The flow of the flocculant pump is 0.15m3/h。
Preferably, rotary drum the revolving speed 800r/min, differential speed 13r/min of the centrifuge；The charging of the centrifuge
Flow is 2m3/h。
The present invention is include at least the following beneficial effects: the device of the invention system and method realizes the company of containing chromium slag washing
Reforwarding row, reduces energy consumption, reduces containing chromium slag harmless treatment difficulty, and makes chromium band damage≤0.5ppm after chromic wastes disposal.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of the apparatus system of the present invention for chromium slag washing.
Specific embodiment:
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of a other elements or combinations thereof.
Fig. 1 shows the apparatus system of the present invention for chromium slag washing, comprising: flocculant storage tank 1；Multistage washing
Device, end wash mill include hollander tub and filter press 2, remaining every grade wash mill includes hollander tub and centrifuge；
The feeding inlet of the centrifuge is connected to hollander tub corresponding in flocculant storage tank and every grade respectively；Wherein in every grade of wash mill
The liquid-phase outlet of centrifuge is connected to the hollander tub in upper level wash mill, beating in solid-phase outlet and next stage wash mill
Stock tank connection；The liquid-phase outlet of the filter press is connected to the hollander tub in upper level wash mill；The end wash mill
Middle hollander tub is connected to the feeding inlet of filter press；Wherein, the hollander tub that first order wash mill is added in chromium slag pumps after being beaten
Enter corresponding centrifuge；The liquid-phase outlet of the centrifuge of first order wash mill is connected to chromic salts product line；End washing
The solid-phase outlet of filter press 2 is connected to chromium slag collection device 3 in device；Hollander tub is connected to water supply device in the wash mill of end
4。
In the above-mentioned technical solutions, the multi-stage washing device is Pyatyi wash mill comprising:
First order wash mill comprising the first hollander tub 5 and the first centrifuge 6；The feeding inlet of first centrifuge 6
It is connected to respectively with the flocculant storage tank 1 and the first hollander tub 5；Is connected between first hollander tub 5 and the first centrifuge 6
One delivery pump 7；
Second level wash mill comprising the second hollander tub 8 and the second centrifuge 9；The feeding inlet of second centrifuge 9
It is connected to respectively with the flocculant storage tank 1 and the second hollander tub 8；The liquid-phase outlet of second centrifuge 9 with described first dozen
Stock tank 5 is connected to；Second hollander tub 8 is connected to the solid-phase outlet of first centrifuge 6；Second hollander tub 8 and
The second delivery pump 10 is connected between two centrifuges 9；
Third level wash mill comprising third hollander tub 11 and third centrifuge 12；The third centrifuge 12 enters
Material mouth is connected to the flocculant storage tank 1 and third hollander tub 11 respectively；The liquid-phase outlet of the third centrifuge 12 with it is described
The connection of second hollander tub 8；The third hollander tub 11 is connected to the solid-phase outlet of second centrifuge 9；The third mashing
Third delivery pump 13 is connected between slot 11 and third centrifuge 12；
Fourth stage wash mill comprising the 4th hollander tub 14 and the 4th centrifuge 15；4th centrifuge 15 enters
Material mouth is connected to the flocculant storage tank 1 and the 4th hollander tub 14 respectively；The liquid-phase outlet of 4th centrifuge 15 with it is described
Third hollander tub 11 is connected to；4th hollander tub 14 is connected to the solid-phase outlet of the third centrifuge 12；Described 4th dozen
The 4th delivery pump 16 is connected between stock tank 14 and the 4th centrifuge 15；
Level V wash mill, i.e. end end wash mill comprising the 5th hollander tub 17 and filter press 2；The pressure
The feeding inlet of filter 2 is connected to the 5th hollander tub 17；The liquid-phase outlet of the filter press 2 and the 4th hollander tub 14 connect
It is logical；The 5th delivery pump 18 is connected between 5th hollander tub 17 and filter press 2；
Wherein, chromium slag is added in the first hollander tub 5, and is passed through the liquid solution from the second centrifuge 9 and is beaten, and makes
The solid concentration of the slurries of mashing is 30%, after mashing by the first delivery pump 7 by slurries with 2m3/ h flow velocity is pumped into corresponding
One centrifuge 6, while flocculant delivery pump 20 is opened by flocculant with 0.15m3The flow velocity of/h passes through valve on the first centrifuge 6
Unlatching be pumped into the first centrifuge 6, set the rotary drum revolving speed of the first centrifuge 6 as 800r/min, differential speed 13r/min, from
The heart to liquid-phase outlet is clear liquid, and 6 liquid-phase outlet of the first centrifuge is connected to the liquid that chromic salts product line 19 obtains centrifugation
Phase clear liquid is delivered to chromic salts product line 19 and is produced；Solid phase after centrifugation is passed through by the solid-phase outlet of the first centrifuge 6
Second mashing tank 8, and be passed through the liquid solution from third centrifuge 12 and be beaten, make the solid concentration of the slurries of mashing
30%, after mashing by the second delivery pump 10 by slurries with 2m3/ h flow velocity is pumped into corresponding second centrifuge 9, while flocculant
Delivery pump 20 is by flocculant with 0.15m3The flow velocity of/h is pumped into the second centrifuge 9 by the unlatching of valve on the second centrifuge 9, if
The rotary drum revolving speed of fixed second centrifuge 9 is 800r/min, differential speed 13r/min, and centrifugation to liquid-phase outlet is clear liquid, by second
9 liquid-phase outlet of centrifuge, which is connected to the first mashing tank 5 the obtained clear liquid of centrifugation is delivered to the first mashing tank 5, is used for the first mashing
Solid phase after centrifugation is passed through third mashing tank 11 by the solid-phase outlet of the mashing slurry of tank 5, the second centrifuge 9, and is passed through
Liquid solution from the 4th centrifuge 15 is beaten, and the solid concentration 30% of the slurries of mashing is made, and passes through the after mashing
Three delivery pumps 13 are by slurries with 2m3/ h flow velocity is pumped into corresponding third centrifuge 12, while flocculant delivery pump 20 is by flocculant
With 0.15m3The flow velocity of/h is pumped into third centrifuge 12 by the unlatching of valve on third centrifuge 12, sets third centrifuge 12
Rotary drum revolving speed be 800r/min, differential speed 13r/min, centrifugation to liquid-phase outlet be clear liquid, the liquid phase of third centrifuge 12
The clear liquid that centrifugation obtains is delivered to the mashing slurry that the second mashing tank 8 is used for the second mashing tank 8, third centrifuge by outlet
Solid phase after centrifugation is passed through the 4th mashing tank 14 by 9 solid-phase outlet, and is passed through the liquid solution from filter press 2 and is beaten
Slurry makes the solid concentration 30% of the slurries of mashing, passes through the 4th delivery pump 16 after mashing for slurries with 2m3/ h flow velocity is pumped into pair
The 4th centrifuge 15 answered, at the same flocculant delivery pump 20 by flocculant with 0.15m3The flow velocity of/h passes through on the 4th centrifuge 15
The unlatching of valve is pumped into the 4th centrifuge 15, sets the rotary drum revolving speed of the 4th centrifuge 15 as 800r/min, differential speed 13r/
Min, centrifugation to liquid-phase outlet are clear liquid, and the clear liquid that centrifugation obtains is delivered to third mashing by the liquid-phase outlet of the 4th centrifuge 15
Solid phase after centrifugation is passed through the by mashing slurry of the tank 11 for third mashing tank 11, the solid-phase outlet of the 4th centrifuge 15
Five mashing tanks 17, and be passed through the new water from water supply device 4 and be beaten, make the solid concentration 30% of the slurries of mashing, beats
After slurry by the 5th delivery pump 18 by slurries with 2m3/ h flow velocity is pumped into filter press 2, and the liquid-phase outlet of filter press 2 obtains filters pressing
Liquid phase be delivered to mashing slurry of the 4th mashing tank 14 for the 4th mashing tank 14, the solid-phase outlet of filter press 2 will press
Solid phase after filter is passed through chromium slag collection device 3, and dress packet carries out harmless treatment after solid phase is dried up.
In the above-mentioned technical solutions, the centrifuge is sedimentation centrifuge；The sedimentation centrifuge is horizontal type screw settling
Conveyer centrifugal or vertical centrifuger with spiral discharge；The filter press is horizontal plate and frame filter press；The flocculant storage tank with from
Flocculant delivery pump is connected between scheming；The flocculant is cationic, anionic, non-ionic macromolecular organic-flocculation
Agent, additional amount are input slurries total amount in centrifuge 0.1 ‰~5 ‰.
The present invention also provides a kind of methods using the above-mentioned apparatus system washing chromium slag for chromium slag washing, comprising:
The first hollander tub in multi-stage washing device is added in chromium slag, and inputs the liquid solution after the centrifugation of next stage centrifuge；
After being beaten in the first hollander tub, slurry is delivered to centrifuge, and flocculant is added by flocculant delivery pump, adjusts centrifugation
Machine feed rate and centrifugal motor frequency make to be separated by solid-liquid separation, and liquid phase clear liquid is that feed liquid containing chromium is conveyed as chromic salts products material liquid
To chromic salts product line, solid phase slag, which enters next stage hollander tub while next stage wash water is added, to be beaten, after mashing
Slurry inputs centrifuge, and adjusting centrifugation unit frequency makes to be separated by solid-liquid separation, and liquid phase clear liquid inputs upper one as upper level washing wash water
Grade hollander tub, solid phase slag enters next stage hollander tub, while next stage wash water is added and is beaten；It repeats the above steps to containing chromium
Slag chromium band damage≤0.5ppm, the wash water of hollander tub comes from supply equipment in the wash mill of end, and solid-liquid separating equipment selects sheet frame
Filter press, liquid phase inputs upper level hollander tub as upper level wash water after separation, and pack carries out harmlessness disposing after solid phase drying.
In the above-mentioned technical solutions, the containing chromium slag includes calcium slag, without calcium slag, wet oxidation slag；The centrifuge is
Sedimentation centrifuge；The sedimentation centrifuge is horizontal type screw settling conveyer centrifugal or vertical centrifuger with spiral discharge；The pressure
Filter is horizontal plate and frame filter press；Flocculant delivery pump is connected between the flocculant storage tank and centrifuge；The multistage washing
The solid concentration that feed liquid is beaten in the hollander tub of device is 30%；The flocculant is cationic, anionic, non-ionic
Macromolecular organic flocculant, additional amount are input slurries total amount in centrifuge 0.1 ‰~5 ‰；The flow of the flocculant pump
For 0.15m3/h；Rotary drum the revolving speed 800r/min, differential speed 13r/min of the centrifuge；The feed rate of the centrifuge is
2m3/h。
The continuous operation that containing chromium slag washing is realized using apparatus of the present invention system and method, is reduced energy consumption, reduced
Containing chromium slag harmless treatment difficulty, and make chromium band damage≤0.5ppm after chromic wastes disposal.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of apparatus system for chromium slag washing characterized by comprising
Flocculant storage tank；
Multi-stage washing device, end wash mill include hollander tub and filter press, remaining every grade wash mill includes mashing
Slot and centrifuge；The feeding inlet of the centrifuge is connected to hollander tub corresponding in flocculant storage tank and every grade respectively；It is wherein every
The liquid-phase outlet of centrifuge is connected to the hollander tub in upper level wash mill in grade wash mill, and solid-phase outlet is washed with next stage
Wash the hollander tub connection in device；The liquid-phase outlet of the filter press is connected to the hollander tub in upper level wash mill；It is described
Hollander tub is connected to the feeding inlet of filter press in the wash mill of end；Wherein, the hollander tub of first order wash mill is added in chromium slag
Corresponding centrifuge is pumped into after being beaten；The liquid-phase outlet of the centrifuge of first order wash mill is connected to chromic salts production
Line；The solid-phase outlet of filter press is connected to chromium slag collection device in the wash mill of end；Hollander tub connects in the wash mill of end
To water supply device.
2. the apparatus system for chromium slag washing as described in claim 1, which is characterized in that the multi-stage washing device is five
Grade wash mill comprising:
First order wash mill comprising the first hollander tub and the first centrifuge；The feeding inlet of first centrifuge respectively with
The flocculant storage tank and the connection of the first hollander tub；The first delivery pump is connected between first hollander tub and the first centrifuge；
Second level wash mill comprising the second hollander tub and the second centrifuge；The feeding inlet of second centrifuge respectively with
The flocculant storage tank and the connection of the second hollander tub；The liquid-phase outlet of second centrifuge is connected to first hollander tub；
Second hollander tub is connected to the solid-phase outlet of first centrifuge；Connect between second hollander tub and the second centrifuge
Connect the second delivery pump；
Third level wash mill comprising third hollander tub and third centrifuge；The feeding inlet of the third centrifuge respectively with
The flocculant storage tank is connected to third hollander tub；The liquid-phase outlet of the third centrifuge is connected to second hollander tub；
The third hollander tub is connected to the solid-phase outlet of second centrifuge；Connect between the third hollander tub and third centrifuge
Connect third delivery pump；
Fourth stage wash mill comprising the 4th hollander tub and the 4th centrifuge；The feeding inlet of 4th centrifuge respectively with
The flocculant storage tank and the connection of the 4th hollander tub；The liquid-phase outlet of 4th centrifuge is connected to the third hollander tub；
4th hollander tub is connected to the solid-phase outlet of the third centrifuge；Connect between 4th hollander tub and the 4th centrifuge
Connect the 4th delivery pump；
Level V wash mill comprising the 5th hollander tub and filter press；The feeding inlet of the filter press and the 5th mashing
Slot connection；The liquid-phase outlet of the filter press is connected to the 4th hollander tub；Connect between 5th hollander tub and filter press
Connect the 5th delivery pump；
Wherein, corresponding first centrifuge is pumped into after being beaten in the first hollander tub of chromium slag addition；The liquid phase of first centrifuge
Outlet is connected to chromic salts product line；The solid-phase outlet of filter press is connected to chromium slag collection device；5th hollander tub is connected to
Water supply device.
3. the apparatus system for chromium slag washing as described in claim 1, which is characterized in that the centrifuge is sedimentation centrifugation
Machine.
4. the apparatus system for chromium slag washing as claimed in claim 3, which is characterized in that the sedimentation centrifuge is horizontal
Screw settling conveyer centrifugal or vertical centrifuger with spiral discharge.
5. the apparatus system for chromium slag washing as described in claim 1, which is characterized in that the filter press is horizontal sheet frame
Filter press.
6. the apparatus system for chromium slag washing as described in claim 1, which is characterized in that the flocculant storage tank and centrifugation
Flocculant delivery pump is connected between machine.
7. a kind of method of the apparatus system washing chromium slag as described in any one of claims 1 to 6 for chromium slag washing, special
Sign is, comprising: the first hollander tub in multi-stage washing device is added in chromium slag, and is inputted after the centrifugation of next stage centrifuge
Liquid solution；After being beaten in the first hollander tub, slurry is delivered to centrifuge, and flocculation is added by flocculant delivery pump
Agent, adjusting centrifuge feed rate and centrifugal motor frequency makes to be separated by solid-liquid separation, and liquid phase clear liquid is that feed liquid containing chromium is produced as chromic salts
Product material liquid is delivered to chromic salts product line, and solid phase slag, which enters next stage hollander tub while next stage wash water is added, to be beaten
Slurry after mashing is inputted centrifuge by slurry, and adjusting centrifugation unit frequency makes to be separated by solid-liquid separation, and liquid phase clear liquid is washed as upper level and used
Wash water inputs upper level hollander tub, and solid phase slag enters next stage hollander tub, while next stage wash water is added and is beaten；In repetition
Step is stated to containing chromium slag chromium band damage≤0.5ppm, the wash water of hollander tub comes from supply equipment in the wash mill of end, is separated by solid-liquid separation
Equipment choosing plate and frame filter press, after separation liquid phase as upper level wash water input upper level hollander tub, solid phase drying after pack into
Row harmlessness disposing.
8. the method for the apparatus system washing chromium slag of chromium slag washing as claimed in claim 7, which is characterized in that described more
The solid concentration that feed liquid is beaten in the hollander tub of grade wash mill is 30%.
9. the method for the apparatus system washing chromium slag of chromium slag washing as claimed in claim 7, which is characterized in that the wadding
Solidifying agent is cationic, anionic, non-ionic macromolecular organic flocculant, and additional amount is slurries total amount in input centrifuge
0.1 ‰~5 ‰；The flow of the flocculant delivery pump is 0.15m3/h。
10. the method for the apparatus system washing chromium slag of chromium slag washing as claimed in claim 7, which is characterized in that described
Rotary drum the revolving speed 800r/min, differential speed 13r/min of centrifuge；The feed rate of the centrifuge is 2m3/h。
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