CN107399854A - The system and method for heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water - Google Patents
The system and method for heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water Download PDFInfo
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- CN107399854A CN107399854A CN201710744150.7A CN201710744150A CN107399854A CN 107399854 A CN107399854 A CN 107399854A CN 201710744150 A CN201710744150 A CN 201710744150A CN 107399854 A CN107399854 A CN 107399854A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses the system and method for heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water, belong to chemical technology field.The present invention forces hydrogen sulfide gas being pressed into acid waste water first with full closed pipe type pressurized reactor, avoids a large amount of hydrogen sulfide gas and overflows, effectively increases the clearance of heavy metal and arsenic in acid waste water, reduce amount of sodium sulfide；By negative-pressure ward method, avoid sodium sulfide solution and flow backward to sour water buffering pump, overflow hydrogen sulfide gas；By two sections of absorption negative pressure degasification methods, the hydrogen sulfide gas in acid waste water mixed liquor is absorbed, it is ensured that the tail gas of discharge is up to standard；By vacuum outgas method, the hydrogen sulfide gas in acid waste water mixed liquor is absorbed again, avoids hydrogen sulfide gas from being overflowed by filtering pressure device and personal injury is caused to operating personnel.The present invention is safe and reliable to operation, and investment is low, and floor space is small, simple to operate, removes the significant effect of heavy metal and arsenic in acid waste water.
Description
Technical field
The wastewater treatment being related in non-ferrous metal metallurgy, it is specifically a kind of removing smelting the invention belongs to chemical technology field
Refine the system and method for heavy metal and arsenic in flue gas acid preparing acid waste water.
Background technology
In non-ferrous metal metallurgy flue gas acid preparing technique wet cleaning washing process, substantial amounts of acid waste water can be produced, because of it
In the heavy metal containing high concentration and arsenic, it is necessary to handle to discharge standard.At present, the removing of heavy metal and arsenic is general in acid waste water
All over vulcanization method is used, that is, vulcanized sodium is added, the precipitation by generating metal sulfide and arsenones separates a huge sum of money in acid waste water
Category and arsenic.Although this method is widely used in acid waste water processing, in order to obtain higher arsenic removal, except cadmium is imitated
Rate, excessive vulcanized sodium need to be often added, cause acid waste water processing system to overflow substantial amounts of intermediate product --- hydrogen sulfide, should
Gas is hypertoxic gas, and solubility is low, explosive, easily threatens personal safety, pollution environment, or even cause the pernicious things such as blast
Therefore therefore, the existing vulcanized sodium precipitation method not only arsenic removal, except cadmium efficiency is low, and great potential safety hazard be present.
The content of the invention
The invention aims to solve above-mentioned technical problem, there is provided one kind removes flue gas during smelting system safe efficiently
The system of heavy metal and arsenic in sour acid waste water.
It is a further object of the present invention to provide one kind to utilize a huge sum of money in said system removing metallurgical off-gas acid-making acid waste water
The method of category and arsenic.
To reach above-mentioned purpose, the present invention uses following technical scheme：In one kind removing metallurgical off-gas acid-making acid waste water
The system of heavy metal and arsenic, including sour water surge tank, vulcanized sodium liquid pool, sodium hydroxide circulating slot, sodium hydroxide absorption tower and
Vacuum outgas sodium hydroxide storage tank, wherein, sour water surge tank buffers one import of pump and injector by sour water and is connected, injector
Another import is connected by vulcanized sodium frequency conversion measuring pump with vulcanized sodium head tank, and injector outlet is sequentially connected tubular type by pipeline
Pressurized reactor and degassing tower, degassing tower top are connected by pipeline with vulcanized sodium absorption tower, and bottom is delayed by pipeline and one-level
Tank connection is rushed, first-level buffer tank is connected by first-level buffer pump with vacuum receiver, and vacuum outgas tank top is by pipeline and very
Pocket is connected, and bottom is connected by pipeline with level 2 buffering tank, and level 2 buffering tank top connects with vacuum outgas sodium hydroxide storage tank
Connect, bottom is connected by level 2 buffering pump with filtering pressure device, and the degassing cover at the top of filtering pressure device is absorbed by pipeline and vulcanized sodium
The import connection of tower, filtering pressure bottom of device are connected by pipeline with clear liquid surge tank, and clear liquid surge tank is conveyed by clear liquid
Pump is connected with outer discharge pipe；Vulcanized sodium liquid pool is connected by vulcanized sodium delivery pump with vulcanized sodium circulating slot, vulcanized sodium circulating slot
It is connected, is vulcanized with vulcanized sodium head tank, vulcanized sodium circulating slot and the import of vulcanized sodium absorption tower respectively by vulcanized sodium circulating pump
Sodium head tank is connected with vulcanized sodium circulating slot, and is connected by vulcanized sodium frequency conversion measuring pump with injector；Sodium hydroxide circulating slot
By sodium hydroxide circulating pump respectively with vulcanized sodium circulating slot, vacuum outgas sodium hydroxide storage tank, one, sodium hydroxide absorption tower
Import and the connection of sodium hydroxide circulating slot cell body；Vacuum outgas sodium hydroxide storage tank is connected with sodium hydroxide circulating slot, and is led to
Vacuum outgas sodium hydroxide circulating pump is crossed to be connected with vacuum；Another import in sodium hydroxide absorption tower connects with vulcanized sodium absorption tower
Connect, sodium hydroxide absorption tower one outlet connection sodium hydroxide circulating slot, another outlet in top connects tail by the blower fan that deaerates and arranged
Chimney；The outlet of vulcanized sodium absorb the bottom of the tower is connected with vulcanized sodium circulating slot.
Above-mentioned vulcanized sodium circulating slot, sodium hydroxide circulating slot, first-level buffer tank and clear liquid surge tank are respectively equipped with mutually
The liquid level gauge and backflow automatic valve of interlocking, itself liquid level is controlled by flowing back.
Level 2 buffering tank is provided with liquid level gauge, the liquid level gauge and bottom row's automatic valve interlocking of level 2 buffering tank outlet, passes through
Itself liquid level of the spent acidic water rate control of outlet.
Injector entrance is provided with sour water automatic valve, and vulcanized sodium frequency conversion metering pump intake is provided with vulcanized sodium automatic valve, and sour water is certainly
Dynamic valve interlocks with sour water buffering pump respectively with vulcanized sodium automatic valve, when sour water buffering pump jumps car, sour water automatic valve and vulcanized sodium
Automatic valve is simultaneously fully closed, avoids acid waste water, acid waste water mixed liquor even sodium sulfide solution from flowing backward to sour water buffering pump.
Sour water buffering pump discharge is provided with sour water flowmeter, and vulcanized sodium frequency conversion measuring pump interlocks with the sour water flowmeter, works as acid
Property wastewater flow decline when, vulcanized sodium frequency conversion metering pump frequency reduce in proportion, so as to reduce vulcanized sodium addition, avoid producing
Excess hydrogen sulfide gas.
Wherein, as standby, degassing blower fan is four groups；Sour water buffering pump, first-level buffer pump, level 2 buffering pump, clear liquid are defeated
Send pump, vulcanized sodium delivery pump, vulcanized sodium circulating pump, sodium hydroxide circulating pump, vacuum outgas sodium hydroxide circulating pump and filtering pressure dress
Put and be respectively provided with two groups.
It is a kind of using said system remove metallurgical off-gas acid-making acid waste water in the method for heavy metal and arsenic, specifically include with
Lower step：
A, in vulcanized sodium liquid pool requirement concentration sodium sulfide solution, through vulcanized sodium delivery pump be delivered to vulcanized sodium circulation
Groove, then it is delivered to vulcanized sodium head tank through vulcanized sodium circulating pump；
B, by acid making system purify caused by acid waste water be delivered to sour water surge tank, and be delivered to injection through sour water buffering pump
Device, the sodium sulfide solution in vulcanized sodium head tank is delivered to injector top entry through vulcanized sodium measuring pump, by acid waste water
Negative pressure caused by injector is flowed through, sodium sulfide solution is sucked, and it is anti-to enter tubular type pressurized reactor after being mixed with acid waste water
Should；
C, reacted acid waste water mixed liquor enters degassing tower spray equipment, and first-level buffer tank is flowed into after once deaerating,
Vacuum receiver spray equipment is delivered to through first-level buffer pump, level 2 buffering tank is flowed into after secondary degassing, through level 2 buffering
Pump is delivered to the filtering of filtering pressure device, and clear liquid, which flows automatically, after filtering enters clear liquid surge tank, and outer discharge pipe is delivered to through clear liquid delivery pump
Into next procedure；
D, the hydrogen sulfide gas that degassing tower once removes covers the gas of removing from bottom to top through over cure with degassing at the top of filtering pressure device
Change sodium absorption tower, sodium sulfide solution counter current contacting sprayed with spray equipment in tower, from vulcanized sodium circulating slot is carried out once
Absorb, sodium sulfide solution is sprayed by vulcanized sodium circulating pump in vulcanized sodium absorption tower, and flows into vulcanized sodium circulating slot；
E, the gas once absorbed through sodium persulfide in step D passes through sodium hydroxide absorption tower from bottom to top, is filled with being sprayed in tower
Put ejection, sodium hydroxide solution counter current contacting from sodium hydroxide circulating slot carry out double absorption, sodium hydroxide solution leads to
Cross sodium hydroxide circulating pump to spray in sodium hydroxide absorption tower, and flow into sodium hydroxide circulating slot, when sodium hydroxide circulating slot
When the hydrogen sulfide gas that interior sodium hydroxide solution absorbs reaches saturation, vulcanized sodium is drained into by sodium hydroxide circulating pump and circulated
Groove, and part sodium hydroxide solution is supplemented into sodium hydroxide circulating slot；
F, by the blower fan that deaerates to be delivered to tail smoke evacuation chimney high-altitude by the gas of sodium hydroxide double absorption in step E in line, leads to
Hydrogen persulfide is monitored on-line, can reach discharge standard；
G, the hydroxide being delivered to from sodium hydroxide circulating slot by sodium hydroxide circulating pump in vacuum outgas sodium hydroxide storage tank
The mixed liquor of sodium solution and acid waste water in level 2 buffering tank, vacuum is delivered to through vacuum outgas sodium hydroxide circulating pump, from
Negative pressure caused by vacuum, the secondary hydrogen sulfide gas being stripped of in mixed liquor are flowed through under above, and is inhaled into vacuum outgas
Sodium hydroxide storage tank, is absorbed by sodium hydroxide solution；
H, can when the hydrogen sulfide gas that sodium hydroxide solution absorbs in vacuum outgas sodium hydroxide storage tank in step G reaches saturation
Sodium hydroxide circulating slot is drained into the bottom of by, and from sodium hydroxide circulating slot by sodium hydroxide circulating pump to vacuum outgas hydrogen-oxygen
Change sodium storage tank supplement part sodium hydroxide solution.
Wherein, it is single cycle that the blower fan that deaerates, which jumps car interlocking, i.e., 2# blower fans start immediately when 1# blower fans jump car, and 2# blower fans jump car
When 3# blower fans start immediately, 3# blower fans jump car when 4# blower fans start immediately, 4# blower fans jump car when 1# blower fans start immediately, it is necessary to really
Protect the operation of an at least Fans.
Sour water surge tank carries out high level operation, and its liquid level is controlled by the addition of acid waste water.
In step C, when filtering pressure device portal pressure rises to 0.4Mpa, acid waste water mixed liquor switches to standby filtering pressure dress
Put, former filtering pressure device carries out pressure slag operation, and the dry slag of press filtration may be recovered, and refine valuable element therein.
The present invention has the advantages that compared to prior art：A kind of removing metallurgical off-gas acid-making spent acidic of the invention
The system of heavy metal and arsenic mainly includes sour water surge tank, injector, tubular type pressurized reactor, degassing tower, first-level buffer in water
Tank, vacuum receiver, level 2 buffering tank, filtering pressure device, vulcanized sodium circulating slot, vulcanized sodium head tank, vulcanized sodium absorption tower, hydrogen-oxygen
Change sodium circulating slot, sodium hydroxide absorption tower, vacuum, vacuum outgas sodium hydroxide storage tank, degassing blower fan and tail smoke evacuation chimney, this hair
It is bright to force hydrogen sulfide gas being pressed into acid waste water first with full closed pipe type pressurized reactor, remove the weight in acid waste water
Metal and arsenic, avoid a large amount of hydrogen sulfide gas and overflow, effectively increase the clearance of heavy metal and arsenic in acid waste water, reduce
Amount of sodium sulfide；Pass through negative-pressure ward method, it is ensured that sodium sulfide solution does not flow backwards, and avoids sodium sulfide solution and flows backward to sour water and delays
Pump is rushed, overflows hydrogen sulfide gas；By two sections of absorption negative pressure degasification methods, the hydrogen sulfide gas in acid waste water mixed liquor is absorbed,
Ensure that the tail gas of discharge is up to standard, avoid polluting environment；By vacuum outgas method, the vulcanization in acid waste water mixed liquor is absorbed again
Hydrogen, as the safeguard measure of acid waste water vulcanization terminal, hydrogen sulfide gas is avoided to be overflowed by filtering pressure device to operator
Member causes personal injury.The present invention is safe and reliable to operation, goes the significant effect of removing heavy metals and arsenic and invests low, floor space
It is small, it is simple to operate, only need less cost to complete the processing to high content acid wastewater, reduce cost of material, press filtration
Waste residue can also continue to recovery refine valuable element.
Brief description of the drawings
Fig. 1 is the connection relationship diagram of apparatus of the present invention.
Reference：1- sour water surge tanks；2- sour waters buffer pump；3- sour water automatic valves；4- injectors；The pressurization of 5- tubular types is anti-
Answer device；6- degassing towers；7- first-level buffer tanks；8- first-level buffer pumps；9- vacuum receivers；10- level 2 buffering tanks；11- two levels are delayed
Rush pump；12- filtering pressure devices；13- clear liquid surge tanks；14- clear liquid delivery pumps；15- vulcanized sodium liquid pools；16- vulcanized sodium delivery pumps；
17- vulcanized sodium circulating slots；18- vulcanized sodium circulating pumps；19- vulcanized sodium frequency conversion measuring pumps；20- vulcanized sodium automatic valves；21- vulcanized sodium
Head tank；22- vulcanized sodium absorption tower；23- sodium hydroxide circulating pumps；24- sodium hydroxide circulating slots；25- sodium hydroxides absorption tower；
26- vacuums；27- vacuum outgas sodium hydroxide storage tanks；28- vacuum outgas sodium hydroxide circulating pumps；29- degassing blower fans；30- tails
Gas chimney；31st, outer discharge pipe.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in figure 1, the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water, including sour water surge tank 1,
Vulcanized sodium liquid pool 15, sodium hydroxide circulating slot 24, sodium hydroxide absorption tower 25 and vacuum outgas sodium hydroxide storage tank 27, its
In, sour water surge tank 11 buffers pump 2 by two groups of sour waters（One to open one standby）It is connected with 4 one imports of injector, injector 4 is another
Import is connected by vulcanized sodium frequency conversion measuring pump 19 with vulcanized sodium head tank 21, and the outlet of injector 4 is pressurizeed by pipeline and tubular type
Reactor 5 is connected, and tubular type pressurized reactor 5 is connected by pipeline with degassing tower 6, and the top of degassing tower 6 passes through pipeline and vulcanized sodium
Absorption tower 22 is connected, and bottom is connected by pipeline with first-level buffer tank 7, and first-level buffer tank 7 passes through two groups of first-level buffer pumps 8（One
It is standby to open one）Be connected with vacuum receiver 9, the top of vacuum receiver 9 is connected by pipeline with vacuum 26, bottom by pipeline and
Level 2 buffering tank 10 is connected, and the top of level 2 buffering tank 10 is connected with vacuum outgas sodium hydroxide storage tank 27, and bottom passes through two group two
Level buffering pump 11（One to open one standby）With two groups of filtering pressure devices 12（One to open one standby）Connection, the degassing cover at the top of filtering pressure device 12 pass through
Pipeline is connected with an import on vulcanized sodium absorption tower 22, and the bottom of filtering pressure device 12 is connected by pipeline with clear liquid surge tank 13,
Clear liquid surge tank 13 passes through two groups of clear liquid delivery pumps 14（One to open one standby）It is connected with outer discharge pipe 31；Vulcanized sodium liquid pool 15 passes through
Two groups of vulcanized sodium delivery pumps 16（One to open one standby）It is connected with vulcanized sodium circulating slot 17, vulcanized sodium circulating slot 17 passes through two groups of vulcanized sodium
Circulating pump 18（One to open one standby）Connect respectively with vulcanized sodium head tank 21, vulcanized sodium circulating slot 17 and the import of vulcanized sodium absorption tower 22
Connect, vulcanized sodium head tank 21 is connected with vulcanized sodium circulating slot 17, and is connected by vulcanized sodium frequency conversion measuring pump 19 with injector 4；
Sodium hydroxide circulating slot 24 passes through two groups of sodium hydroxide circulating pumps 23（One to open one standby）Taken off respectively with vulcanized sodium circulating slot 17, vacuum
Gas sodium hydroxide storage tank 27, the import of 25 1, sodium hydroxide absorption tower and the connection of the cell body of sodium hydroxide circulating slot 24；Vacuum takes off
Gas sodium hydroxide storage tank 28 is connected with sodium hydroxide circulating slot 24, and passes through two groups of vacuum outgas sodium hydroxide circulating pumps 28（One
It is standby to open one）It is connected with vacuum 26；The 25 another import of sodium hydroxide absorption tower is connected with vulcanized sodium absorption tower 22, and sodium hydroxide is inhaled
The one outlet of tower 25 connection sodium hydroxide circulating slot 24 is received, another outlet in top passes through four groups of degassing blower fans 29（One to open three standby）Even
Connect tail smoke evacuation chimney 30；The outlet at bottom of vulcanized sodium absorption tower 22 is connected with vulcanized sodium circulating slot 17；Above-mentioned vulcanized sodium circulating slot 17, hydrogen
Sodium oxide molybdena circulating slot 24, first-level buffer tank 7 and clear liquid surge tank 13 are respectively equipped with the liquid level gauge of reciprocal interlocking and flowed back automatic
Valve；Level 2 buffering tank 10 is provided with liquid level gauge, bottom row's automatic valve interlocking that the liquid level gauge exports with level 2 buffering tank 10；Injector
4 entrances are provided with sour water automatic valve 3, and the entrance of vulcanized sodium frequency conversion measuring pump 19 is provided with vulcanized sodium automatic valve 20, sour water automatic valve 3 and sulphur
Change sodium automatic valve 20 to interlock with sour water buffering pump 2 respectively；The outlet of sour water buffering pump 2 is provided with sour water flowmeter, and vulcanized sodium becomes frequency meter
Pump 19 is measured to interlock with the sour water flowmeter.
Acid making system purifies acid waste water when said system is applied into normal production（Acidity：166g/L, copper content：
330mg/L, cadmium content：66 mg/L, arsenic content：1204mg/L, acid waste water flow：25m3/h）Heavy metal and arsenic removing
In, calculate mass concentration be 15% sodium sulfide solution addition be 0.34 m3/ h, to improve the clearance of heavy metal and arsenic,
Excessive one times, i.e. 0.68 m by vulcanized sodium addition3/ h, specifically includes following steps：Acid making system purifies when will normally produce
Caused acid waste water is delivered to sour water surge tank 1, injector 4 is delivered to through sour water buffering pump 2, from vulcanized sodium liquid pool 15
Also it is delivered to through vulcanized sodium measuring pump 19 into vulcanized sodium head tank 21 15% sodium sulfide solution via vulcanized sodium circulating slot 17
Injector 4, reacted after being mixed with acid waste water therein into tubular type pressurized reactor 5, reacted acid waste water mixed liquor
Into degassing tower spray equipment 6, first-level buffer tank 7 is entered after once deaerating, vacuum outgas is delivered to through first-level buffer pump 8
The spray equipment of tank 9, enters level 2 buffering tank 10 after secondary degassing, and the mistake of filtering pressure device 12 is delivered to through level 2 buffering pump 11
Filter, clear liquid enters next procedure from clear liquid surge tank 13 is flowed into after clear liquid delivery pump 14 is delivered to outer discharge pipe 31 after filtering.
After testing, clear liquid index after filtering（Acidity：149g/L, copper content：<0.1mg/L, cadmium content：<0.1mg/L, arsenic content：
0.42mg/L）, the clearance of heavy metal and arsenic（Copper：99.97%, cadmium：99.85%, arsenic：99.97%）, removal effect is notable, and reaches
To discharge standard.
Embodiment 2
The system of heavy metal and arsenic is with embodiment 1 in removing metallurgical off-gas acid-making acid waste water in the present embodiment, applied to anon-normal
Often acid making system purification high content acid wastewater during production（Acidity：183g/L, copper content：658mg/L, cadmium content：184
Mg/L, arsenic content：2236mg/L, acid waste water flow：25m3/h）Heavy metal and arsenic removing in, calculate mass concentration
Sodium sulfide solution addition for 15% is 0.65 m3/ h, to improve the clearance of heavy metal and arsenic, by vulcanized sodium addition mistake
One times of amount, i.e. 1.3m3/ h, specific steps are the same as embodiment 1.After testing, clear liquid index after filtering（Acidity：148g/L, copper content：<
0.1mg/L, cadmium content：0.16mg/L, arsenic content：1.3mg/L）, the clearance of heavy metal and arsenic（Copper：99.98%, cadmium：
99.91%, arsenic：99.94%）, removal effect is notable, and close to discharge standard, it is only necessary to conventional lime stone-iron salt method processing
Can be up to standard, and dosing is minimum.
Claims (10)
- A kind of 1. system of heavy metal and arsenic in removing metallurgical off-gas acid-making acid waste water, it is characterised in that：Buffered including sour water Tank（1）, vulcanized sodium liquid pool（15）, sodium hydroxide circulating slot（24）, sodium hydroxide absorption tower（25）With vacuum outgas hydroxide Sodium storage tank（27）, the sour water surge tank（1）Pump is buffered by sour water（2）With injector（4）One import connection, injector （4）Another import passes through vulcanized sodium frequency conversion measuring pump（19）With vulcanized sodium head tank（21）Connection, injector（4）Outlet passes through pipe Road is sequentially connected tubular type pressurized reactor（5）And degassing tower（6）, degassing tower（6）Top passes through pipeline and vulcanized sodium absorption tower （22）Connection, bottom passes through pipeline and first-level buffer tank（7）Connection, first-level buffer tank（7）Pass through first-level buffer pump（8）With vacuum Degassing tank（9）Connection, vacuum receiver（9）Top passes through pipeline and vacuum（26）Connection, bottom is delayed by pipeline and two level Rush tank（10）Connection, level 2 buffering tank（10）Top and vacuum outgas sodium hydroxide storage tank（27）Connection, bottom is delayed by two level Rush pump（11）With filtering pressure device（12）Connection, filtering pressure device（12）The degassing cover at top passes through pipeline and vulcanized sodium absorption tower（22） An import connection, filtering pressure device（12）Bottom passes through pipeline and clear liquid surge tank（13）Connection, clear liquid surge tank（13）It is logical Cross clear liquid delivery pump（14）With outer discharge pipe（31）Connection；The vulcanized sodium liquid pool（15）Pass through vulcanized sodium delivery pump（16）With Vulcanized sodium circulating slot（17）Connection, vulcanized sodium circulating slot（17）Pass through vulcanized sodium circulating pump（18）Respectively with vulcanized sodium head tank （21）, vulcanized sodium circulating slot（17）And vulcanized sodium absorption tower（22）Import connects, vulcanized sodium head tank（21）Followed with vulcanized sodium Annular groove（17）Connection, and pass through vulcanized sodium frequency conversion measuring pump（19）With injector（4）Connection；The sodium hydroxide circulating slot（24） Pass through sodium hydroxide circulating pump（23）Respectively with vulcanized sodium circulating slot（17）, vacuum outgas sodium hydroxide storage tank（27）, hydroxide Sodium absorption tower（25）One import and sodium hydroxide circulating slot（24）Cell body connects；The vacuum outgas sodium hydroxide storage tank （28）With sodium hydroxide circulating slot（24）Connection, and pass through vacuum outgas sodium hydroxide circulating pump（28）With vacuum（26）Even Connect；The sodium hydroxide absorption tower（25）Another import and vulcanized sodium absorption tower（22）Connection, sodium hydroxide absorption tower（25）One Individual outlet connection sodium hydroxide circulating slot（24）, another outlet in top passes through the blower fan that deaerates（29）Connect tail smoke evacuation chimney（30）；Institute State vulcanized sodium absorption tower（22）Outlet at bottom and vulcanized sodium circulating slot（17）Connection.
- 2. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The vulcanized sodium circulating slot（17）, sodium hydroxide circulating slot（24）, first-level buffer tank（7）And clear liquid surge tank （13）It is respectively equipped with the liquid level gauge and backflow automatic valve of reciprocal interlocking.
- 3. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The level 2 buffering tank（10）It is provided with liquid level gauge, the liquid level gauge and level 2 buffering tank（10）The bottom row of outlet is automatic Valve interlocks.
- 4. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The injector（4）Entrance is provided with sour water automatic valve（3）, vulcanized sodium frequency conversion measuring pump（19）Entrance is provided with vulcanized sodium Automatic valve（20）, sour water automatic valve（3）With vulcanized sodium automatic valve（20）Respectively pump is buffered with sour water（2）Interlocking.
- 5. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The sour water buffers pump（2）Outlet is provided with sour water flowmeter, vulcanized sodium frequency conversion measuring pump（19）With the sour water flowmeter Interlocking.
- 6. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The degassing blower fan（29）For four groups.
- 7. the system of heavy metal and arsenic in a kind of removing metallurgical off-gas acid-making acid waste water according to claim 1, it is special Sign is：The sour water buffers pump（2）, first-level buffer pump（8）, level 2 buffering pump（11）, clear liquid delivery pump（14）, vulcanized sodium it is defeated Send pump（16）, vulcanized sodium circulating pump（18）, sodium hydroxide circulating pump（23）, vacuum outgas sodium hydroxide circulating pump（28）And filter Pressure device（12）It is two groups.
- 8. a kind of remove the method for heavy metal and arsenic in metallurgical off-gas acid-making acid waste water using system as claimed in claim 1, Characterized in that, this method comprises the following steps：A, in vulcanized sodium liquid pool（15）The sodium sulfide solution of interior requirement concentration, through vulcanized sodium delivery pump（16）It is delivered to sulphur Change sodium circulating slot（17）, then through vulcanized sodium circulating pump（18）It is delivered to vulcanized sodium head tank（21）；B, by acid making system purify caused by acid waste water be delivered to sour water surge tank（1）, and buffer pump through sour water（2）It is delivered to Injector（4）, vulcanized sodium head tank（21）In sodium sulfide solution through vulcanized sodium frequency conversion measuring pump（19）It is delivered to injector（4） Top entry, injector is flowed through by acid waste water（4）Caused negative pressure, sodium sulfide solution is sucked, and is mixed with acid waste water Enter tubular type pressurized reactor after conjunction（5）Reaction；C, reacted acid waste water mixed liquor enters degassing tower（6）Spray equipment, first-level buffer is flowed into after once deaerating Tank（7）, through first-level buffer pump（8）It is delivered to vacuum receiver（9）Spray equipment, level 2 buffering tank is flowed into after secondary degassing （10）, through level 2 buffering pump（11）It is delivered to filtering pressure device（12）Filtering, clear liquid, which flows automatically, after filtering enters clear liquid surge tank（13）, Through clear liquid delivery pump（14）It is delivered to outer discharge pipe（31）Into next procedure；D, degassing tower（6）The hydrogen sulfide gas once removed and filtering pressure device（12）The gas of top degassing cover removing is from bottom to top Through sodium persulfide absorption tower（22）, with tower spray equipment spray, from vulcanized sodium circulating slot（17）Sodium sulfide solution it is inverse Stream contact is once absorbed, and sodium sulfide solution passes through vulcanized sodium circulating pump（18）On vulcanized sodium absorption tower（22）Interior spray, and Flow into vulcanized sodium circulating slot（17）；E, the gas once absorbed through sodium persulfide in step D passes through sodium hydroxide absorption tower from bottom to top（25）, with being sprayed in tower Shower device spray, from sodium hydroxide circulating slot（24）Sodium hydroxide solution counter current contacting carry out double absorption, hydroxide Sodium solution passes through sodium hydroxide circulating pump（23）On sodium hydroxide absorption tower（25）Interior spray, and flow into sodium hydroxide circulating slot （24）, when sodium hydroxide circulating slot（24）When the hydrogen sulfide gas that interior sodium hydroxide solution absorbs reaches saturation, pass through hydrogen-oxygen Change sodium circulating pump（23）Drain into vulcanized sodium circulating slot（17）, and to sodium hydroxide circulating slot（24）Interior supplement part sodium hydroxide is molten Liquid；F, the blower fan that deaerates is passed through by the gas of sodium hydroxide double absorption in step E（29）It is delivered to tail smoke evacuation chimney（30）High-altitude It is in line, monitored on-line by hydrogen sulfide, can reach discharge standard；G, from sodium hydroxide circulating slot（24）Pass through sodium hydroxide circulating pump（23）It is delivered to vacuum outgas sodium hydroxide storage tank （27）In sodium hydroxide solution and level 2 buffering tank（10）The mixed liquor of middle acid waste water, circulated through vacuum outgas sodium hydroxide Pump（28）It is delivered to vacuum（26）, vacuum is flowed through from top to bottom（26）Caused negative pressure, it is secondary to be stripped of in mixed liquor Hydrogen sulfide gas, and be inhaled into vacuum outgas sodium hydroxide storage tank（27）, absorbed by sodium hydroxide solution；H, vacuum outgas sodium hydroxide storage tank in step G（27）The hydrogen sulfide gas that interior sodium hydroxide solution absorbs reaches saturation When, sodium hydroxide circulating slot can be drained into the bottom of by（24）, and from sodium hydroxide circulating slot（24）Pass through sodium hydroxide circulating pump （23）To vacuum outgas sodium hydroxide storage tank（27）Supplement part sodium hydroxide solution.
- 9. the method for heavy metal and arsenic in removing metallurgical off-gas acid-making acid waste water according to claim 8, its feature exist In：The degassing blower fan（29）It is single cycle to jump car interlocking.
- 10. the method for heavy metal and arsenic in removing metallurgical off-gas acid-making acid waste water according to claim 8, its feature exist In：In step C, the filtering pressure device（12）When inlet pressure rises to 0.4Mpa, acid waste water mixed liquor switches to standby filtering pressure Device, former filtering pressure device carry out pressure slag operation.
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