CN103381335B - Method for removing hydrogen sulfide through chromium slag - Google Patents
Method for removing hydrogen sulfide through chromium slag Download PDFInfo
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- CN103381335B CN103381335B CN201310300243.2A CN201310300243A CN103381335B CN 103381335 B CN103381335 B CN 103381335B CN 201310300243 A CN201310300243 A CN 201310300243A CN 103381335 B CN103381335 B CN 103381335B
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Abstract
The invention relates to a method for removing hydrogen sulfide through chromium slag. The method includes that chromium slag is dried and crushed and then is filled in a reaction bed, and chromium slag powder is heated to be at 30-50 DEG C and then is kept at constant temperature; mixed gases are filled from the bottom of the reaction bed at 80-100 SCCM constant speed, tail gases generated after reaction are discharged from the top of the reaction bed and filled into a flue gas analyzer; when the flue gas analyzer detects that the tail gases contain hydrogen sulfide, the tail gases discharged from a gas outlet of the flue gas analyzer are filled into alkaline liquor, and when the flue gas analyzer detects that concentration of hydrogen sulfide reaches 10-20mg/m<3>, filling of mixed gases is stopped. The method solves the problems of chromium slag poison and hydrogen sulfide removing, raw materials are pollution sources, and therefore the effect of using waste to treat waste is achieved. Treated chromium slag can be used as building materials and causes no secondary pollution.
Description
Technical field
The present invention relates to a kind of hydrogen sulfide removal method, specifically a kind of method utilizing chromium slag to remove hydrogen sulfide, belongs to environmental protection technical field.
Background technology
Hydrogen sulfide is colourless gas, and the hydrogen sulfide of low concentration has strong rotten egg foul odour, is a kind of strong neurotoxic substance, can be directly detrimental to health, and one of odor pollution six large public hazards being considered to be only second to noise.In natural gas purification, petroleum refining, Coal Chemical Industry, municipal wastewater process engineering and in specific resistance to filtration process, all can produce H 2 S-containing gas (H2S), its content is relatively high compared with other component, strong toxicity, olfact is low, and pollutant emission standard desired value is lower.Its foul gas produced causes very large secondary pollution, has a strong impact on ambient atmosphere environment.Foul gas not only gives people's strong impulse in sense of smell, makes people uncomfortable; And also have harm to a certain degree to the physical and mental health of people, reduce the quality of life of people.Its in atmosphere maximum acceptable concentration be 10mg/m
3.They are not only directly detrimental to health, extremely unfavorable to the growth of animal, and under aerobic and damp and hot condition, severe corrosion equipment, pipeline and instrument etc., and the aging of nonmetallic materials can be accelerated; Be cause one of atmosphere pollution, greenhouse effects and main matter of damaging the ozone layer, belong to one of environmental contaminants that must eliminate or control.Therefore, the correlative study of removing hydrogen sulfide in waste gas receives much concern.
The Chinese patent CN 102921286A(patent No.: 201210452317.X) disclose the device that a kind of low-level oxidation method removes hydrogen sulfide in waste water, waste gas, and realize the recovery of elemental sulfur.This device, comprises oxidation unit, cycling element and parametric controller, and oxidation unit top is provided with the probe and gas discharge outlet that are connected with parametric controller, and bottom is provided with gas pipe, liquid outlet and sulphur simple substance recovery port; Cycling element is provided with waste gas or waterwater entrance, air intake, check valve and peristaltic pump.The present invention also provides and utilizes said apparatus low-level oxidation method to remove hydrogen sulfide and reclaim the method for sulphur simple substance.Device of the present invention does not need filler, chemical reagent and microorganism, and cost is low, efficient, safety, mild condition, can use under normal temperature and pressure; Air blast can according to desulfurized effect by the conputer controlled blow rate required, and can realize the Automated condtrol of system, be elemental sulfur by Oxidation of Hydrogen Sulfide, avoids the secondary pollution that may cause.But this patent exists following shortcoming: this device control units is many, comparatively complicated, cost is high, operates and wastes time and energy.
The waste residue that chromium slag discharges in chromium salt production process, a kind of hazardous waste with severe toxicity, wherein Cr VI (Cr6+) is the root of toxicity.The composition of chromium slag can change along with the difference of the places of origin of raw materials and production technology.According to the analysis result to China's part chromium dreg chemistry composition characteristics, with Cr2O3 metering, in chromium slag, total chromium average quality percentage composition is about 3 ~ 5%, and Cr VI average quality percentage composition is about 1 ~ 5%.The many employings of China's chromium salt production have calcium roasting technique, containing a large amount of calcium-magnesium ratio compounds in chromium slag, in alkalescence.Chromium slag output is comparatively large, often produces 1 ton of chromic salts product, just can produce 2.5-3 ton chromium slag.The chromium slag of current China accumulation, up to more than 600 ten thousand tons, discharges the chromium slag of about 600,000 tons every year on average.The long-pending not only land occupation of chromium slag muck; And due to its high alkalinity, the microorganism in soil can be killed, spoiled soil, not even a blade of grass grows to cause piling up place.In addition, in long-term outdoor banking process, have Cr VI and leach migration, pollute soil around and water body, and enter human body by vegeto-animal enrichment and food chain, and then be detrimental to health.Large 100 times of chromic toxicity ratio trivalent chromium, Cr VI has carcinogenic, mutagenesis, causes huge harm to the mankind and environment.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of minimizing technology of hydrogen sulfide gas of simple, efficient, low cost, and industrial waste chromium slag can be made to get utilization, fully must make use of two kinds of pollutants, the treatment of wastes with processes of wastes against one another, makes refuse obtain utilization that is innoxious, resource.
raw material illustrates:
The waste residue produced in the production process of the raw material chromium slag that the present invention adopts from abundant Xinghua factory of Jinan City chromic salts.Wherein silica accounts for 9% ~ 11%, and alundum (Al2O3) accounts for 5% ~ 6%, and calcium oxide accounts for 29% ~ 33%, magnesia accounts for 19% ~ 27%, and di-iron trioxide accounts for 8% ~ 11%, and total chromium accounts for 3% ~ 7%, Cr VI 2% ~ 4%, essential mineral contained by chromium slag has periclase (MgO), dicalcium silicate (2CaOSiO
2), Bu Shi stone (4CaOAl
2o
3fe
2o
3) and 1 ~ 10% residual chromium iron ore, be all weight percentage.
technical scheme of the present invention is as follows:
Utilize chromium slag to remove a method for hydrogen sulfide, comprise step as follows:
(1) get chromium slag, drying, pulverizing, cross 20 ~ 100 mesh sieves, make chromium ground-slag end, be evenly laid in reaction bed at chromium ground-slag end, the tiling thickness at described chromium ground-slag end is 2 ~ 5 ㎝;
(2) heat reaction bed, make chromium slag powder temperature reach 30 ~ 50 DEG C and keep constant temperature;
(3) mix with nitrogen by hydrogen sulfide gas or containing the gas of hydrogen sulfide, obtain mist, described hydrogen sulfide gas or contain the gas of hydrogen sulfide and the volume ratio of nitrogen is (4 ~ 6): (94 ~ 96); At the uniform velocity mist is passed into the speed of 80 ~ 100SCCM from the bottom of reaction bed, make mist bottom chromium ground-slag end through and with chromium slag powder contact, the top of reaction bed is connected with flue gas analyzer, and the tail gas produced after reaction is discharged from the top of reaction bed and passed into flue gas analyzer;
(4) when flue gas analyzer detect in tail gas have hydrogen sulfide time, the tail gas that flue gas analyzer gas outlet is discharged is passed in alkali lye immediately, when flue gas analyzer detect the concentration of hydrogen sulfide reach 10 ~ 20mg/m3 time, stop passing into mist.
The method utilizing chromium slag to remove hydrogen sulfide of the present invention, chromium slag powder temperature reaches 30 ~ 50 DEG C and after keeping constant temperature, ceaselessly logical mist, reacted tail gas is ceaselessly discharged, process hydrogen sulfide very capable of chromium slag during beginning, in 2 ~ 3 hours, not sulfide hydrogen in the tail gas of discharge, along with the carrying out of reaction, the disposal ability of chromium slag weakens gradually, can detect in tail gas have hydrogen sulfide, along with the decline of the disposal ability of chromium slag, in tail gas, concentration of hydrogen sulfide is also becoming large gradually, when the concentration of hydrogen sulfide gas reaches 10 ~ 20mg/m
3time, stop passing into mist.
Preferably, described is more than 1% containing the percent by volume of hydrogen sulfide in the gas of hydrogen sulfide.
The present invention is preferred, and after step (1) is dry, the water content of chromium slag is within the scope of 0 ~ 24wt%.When in chromium slag, moisture is too high, in course of reaction, easily harden in chromium ground-slag end, mist and chromium slag powder contact uneven, affect reaction efficiency, hydrogen sulfide removal effect is bad, after drying of the present invention, the water content of chromium slag is within the scope of 0 ~ 24wt%, and hydrogen sulfide removal efficiency is high, and hydrogen sulfide removal rate can reach 91% ~ 98%.
The present invention is preferred, and described alkali lye is the Ca (OH) of 1mol/L
2alkali lye.When flue gas analyzer detect in tail gas have hydrogen sulfide time, immediately tail gas is passed in alkali lye, when flue gas analyzer detect the concentration of hydrogen sulfide reach 10 ~ 20mg/m3 time, stop logical mist, the hydrogen sulfide do not got rid of in tail gas and Ca (OH)
2reaction, is discharged into the tail gas not sulfide hydrogen in air, free from environmental pollution.
Preferably, described hydrogen sulfide gas or be (5 ~ 6) containing the gas of hydrogen sulfide and the volume ratio of nitrogen: (95 ~ 96).Nitrogen, as loading gas, is used for steady air flow, mist is contacted evenly with chromium slag, reacts completely.Experiment proves, if the hydrogen sulfide gas that the gas in input reaction is single or the gas containing hydrogen sulfide, gas flow rate is uneven, unstable, impulse force is excessively strong sometimes for disorderly air-flow, easily blown afloat at chromium ground-slag end, affect the effect contacted with chromium slag, hydrogen sulfide gas is removed not obvious, hydrogen sulfide gas of the present invention or containing the gas of hydrogen sulfide and the volume ratio of nitrogen be inventor through unlimited experiment, long-felt obtains.
The present invention is preferred, and the speed that step (3) mist passes into reaction bed is 95 ~ 96SCCM.SCCM is volume flow unit, namely marks condition milliliter per minute.The speed that mist of the present invention passes into reaction bed is the most suitable, and mist contacts fully with chromium slag, and hydrogen sulfide and chromium slag react sufficient, and hydrogen sulfide removal is thorough, and the tail gas produced after reaction is not containing hydrogen sulfide.If mist flow velocity is excessive, mist contacts insufficient with chromium slag, and mist is not able to do in time to react with chromium slag just to discharge reaction bed, and do not have the object removing hydrogen sulfide, if mist flow velocity is too small, then hydrogen sulfide removal efficiency is lower.
The proportioning of the removal efficiency of hydrogen sulfide of the present invention and chromium slag water content, hydrogen sulfide gas or the gas containing hydrogen sulfide and nitrogen, that mist passes into the factors such as speed is closely related.Logical mist is carried out with flow velocity of the present invention, just hydrogen sulfide is there will be in tail gas after 2 ~ 3 hours, when flue gas analyzer detect in tail gas have hydrogen sulfide time, immediately tail gas is passed in alkali lye, when the concentration that flue gas analyzer detects hydrogen sulfide reaches 10 ~ 20mg/m3, stop logical mist, the hydrogen sulfide do not got rid of in tail gas and Ca (OH)
2reaction, is discharged into the tail gas not sulfide hydrogen in air, free from environmental pollution, both eliminates hydrogen sulfide, and takes full advantage of again discarded chromium slag
The present invention is preferred, and the heating of step (2) described reaction bed is placed in by reaction bed on water-bath or heat collecting type constant-temperature heating magnetic stirring apparatus to heat.Described water-bath, heat collecting type constant-temperature heating magnetic stirring apparatus are prior art, can buy in market.
The present invention is preferred, and described reaction bed is sand core funnel, and the aperture of core filter plate is less than 150 μm.
The present invention also provides a kind of above-mentioned special purpose device utilizing chromium slag to remove the method for hydrogen sulfide, comprise nitrogen storage tank, pending gas storage tank, reaction bed, flue gas analyzer and mist temporary storage tank, hydrogen sulfide gas or the gas containing hydrogen sulfide is stored in described pending gas storage tank, described nitrogen storage tank, pending gas storage tank is all connected with mist temporary storage tank jointly by pipeline, mist temporary storage tank is connected with reaction bed by tube connector, described reaction bed is sand core funnel, the bottom of sand core funnel is provided with the heater for heating sand core funnel, the top of sand core funnel is provided with the rubber stopper sealing sand core funnel, communicating pipe is provided with between sand core funnel and flue gas analyzer, one end of communicating pipe to be arranged in rubber stopper and to be communicated with sand core funnel inside, the other end is connected with the air inlet of flue gas analyzer, the gas outlet of flue gas analyzer is connected with escape pipe, escape pipe with fill Ca (OH)
2the Drexel bottle of solution is connected.
Preferably, between described nitrogen storage tank and mist temporary storage tank pipeline pipeline on, between pending gas storage tank and mist temporary storage tank pipeline pipeline on be provided with mass flowmenter and control the control valve of gas flow rate, be provided with the control valve of control gas flow rate the communicating pipe between sand core funnel and flue gas analyzer.
The present invention is preferred, pipeline between described nitrogen storage tank and mist temporary storage tank, the pipeline between pending gas storage tank and mist temporary storage tank, tube connector between mist temporary storage tank and reaction bed and communicating pipe be polyfluortetraethylene pipe.
Described heater is water-bath or heat collecting type constant-temperature heating magnetic stirring apparatus.Water-bath, heat collecting type constant-temperature heating magnetic stirring apparatus are prior art, can buy in market.
Described mass flowmenter is all connected with Flow Measurement Display Meter.For showing the flow by gas.
principle of the present invention:
Containing certain oxide in chromium slag, as silica, calcium oxide, magnesia, di-iron trioxide, these oxides all can with H
2s reacts, and under the condition of aerobic, utilizes catalytic action, by H
2s is converted into elemental sulfur, Cr VI in chromium slag, Cr VI is hypertoxic and oxidisability is comparatively strong, and hydrogen sulfide belongs to reproducibility compound, the Cr VI of severe toxicity both can be converted into nontoxic trivalent chromium through redox reaction by both, can reach again the object of removing hydrogen sulfide; In chromium slag, partial oxide can generate hydroxide as aluminium oxide and hydrogen sulfide gas reacts in water environment; In chromium slag, relict mineral matter (as periclase) can adsorb a small amount of hydrogen sulfide by physical action, to reach removal effect simultaneously.
advantage of the present invention is as follows:
1, hydrogen sulfide removal method of the present invention, uses discarded chromium slag as inorganic agent, and chromium slag source is wide, annual production is large and have severe toxicity, and harm is serious, and hydrogen sulfide is foul gas, utilizing chromium slag to remove hydrogen sulfide reaches except stench hydrogen sulfide, solves the problem of chromium slag environmental pollution simultaneously; Removal efficiency is higher, and industrial waste chromium slag can be made to obtain resource, reaches the effect of waste recycling.Chromium slag after process can be used as construction material, can not there is ecological risk, non-secondary pollution.
2, hydrogen sulfide removal method of the present invention, nitrogen is as loading gas, and be used for steady air flow, hydrogen sulfide is contacted evenly with chromium slag, reacts completely, hydrogen sulfide removal efficiency is high, and hydrogen sulfide removal rate can reach 91% ~ 98%.
3, to pass into the speed of reaction bed the most suitable for mist of the present invention, and mist contacts fully with chromium slag, and hydrogen sulfide and chromium slag react sufficient, and hydrogen sulfide removal is thorough, and the tail gas produced after reaction is not containing hydrogen sulfide.
4, hydrogen sulfide removal method of the present invention, after the drying of chromium slag, water content is within the scope of 0 ~ 24wt%.Chromium slag pulverulent bulk in course of reaction, voidage is large, mist and chromium slag powder contact full and uniform, reaction efficiency is high, and hydrogen sulfide removal is thorough.
5, method of the present invention, not only achieves the removal of hydrogen sulfide, and make use of discarded chromium slag, eliminates pollution, protects environment, improves financial cost simultaneously, achieve many things at one stroke, improve the utilization rate of discarded object, have very high economic benefit.
6, apparatus structure of the present invention is simple, is easy to operation, equipment cost, and reaction is easy to control.
Accompanying drawing explanation
Fig. 1 is the present invention removes the device of hydrogen sulfide structural representation for chromium slag, and it comprises:
1, nitrogen storage tank, 2, pending gas storage tank, 3, mass flowmenter between nitrogen storage tank and mist temporary storage tank on pipeline, 4, mass flowmenter between pending gas storage tank and mist temporary storage tank on pipeline, 5, Flow Measurement Display Meter, 6, mist temporary storage tank, 7, sand core funnel, 8, flue gas analyzer, 9, Drexel bottle, 10, tube connector, 11, communicating pipe, 12, escape pipe.
Fig. 2 is the structural representation of reaction bed (sand core funnel).
Detailed description of the invention
Below by specific embodiment, also the present invention will be further described by reference to the accompanying drawings, but be not limited thereto.
The flue gas analyzer adopted in embodiment purchased from Wuhan Tianhong Instrument Co., Ltd, No. 01000176, model Hubei Province system.
Heat collecting type constant-temperature heating magnetic stirring apparatus is purchased from Zheng Zhengzhou Ke Tai experimental facilities Co., Ltd; Model DF-101S.
Mass flowmenter Beijing Qixing Huachuang Electronics Co., Ltd, model D07-7.
Flow Measurement Display Meter purchased from Beijing Qixing Huachuang Electronics Co., Ltd, model D08-2F.
embodiment 1
A kind of device removing hydrogen sulfide for chromium slag, structure as shown in Figure 1, comprise nitrogen storage tank 1, pending gas storage tank 2, reaction bed, flue gas analyzer 8 and mist temporary storage tank 6, pending gas storage tank is built with hydrogen sulfide gas or the gas containing hydrogen sulfide, described nitrogen storage tank 1, pending gas storage tank 2 is all connected with mist temporary storage tank 6 jointly by pipeline, mist temporary storage tank 6 is connected with reaction bed by tube connector 10, described reaction bed is sand core funnel 7, tube connector 10 is connected to the bottom of sand core funnel 7, the bottom of sand core funnel 7 is provided with the water-bath for heating sand core funnel 7, the top of sand core funnel 7 is provided with the rubber stopper sealing sand core funnel, communicating pipe 11 is provided with between sand core funnel and flue gas analyzer, one end of communicating pipe 11 to be arranged in rubber stopper and to be communicated with sand core funnel 7 inside, the other end is connected with the air inlet of flue gas analyzer 8, the gas outlet of flue gas analyzer is connected with escape pipe 12, escape pipe 12 with fill Ca (OH)
2the Drexel bottle 9 of solution is connected.
Between nitrogen storage tank and mist temporary storage tank pipeline pipeline on be provided with mass flowmenter 3 and control the control valve (not marking in figure) of gas flow rate, between pending gas storage tank and mist temporary storage tank pipeline pipeline on be provided with mass flowmenter 4 and control the control valve of gas flow rate, mass flowmenter 3 is all connected with Flow Measurement Display Meter 5 with mass flowmenter 4, is provided with the control valve controlling gas flow rate the communicating pipe 11 between sand core funnel 7 and flue gas analyzer 8.Pipeline between described nitrogen storage tank and mist temporary storage tank, the pipeline between pending gas storage tank and mist temporary storage tank, tube connector 10 and communicating pipe 11 are polyfluortetraethylene pipe.
embodiment 2
Utilize the device described in embodiment 1 to carry out removing the method for hydrogen sulfide, comprise step as follows:
1, chromium slag is dry, makes the water content control of chromium slag at 0wt%, then pulverizes, and crosses 20 mesh sieves, makes chromium ground-slag end, and take 0.5g chromium ground-slag end and be evenly placed on the core filter plate of sand core funnel, the tiling thickness at chromium ground-slag end is 2 ㎝;
2, reaction bed be heated to 30 DEG C in water-bath and keep constant temperature;
3, open the control valve of control valve and the control gas flow rate between pending gas storage tank and mist temporary storage tank between nitrogen storage tank and mist temporary storage tank simultaneously, observe Flow Measurement Display Meter, regulate flow velocity size, hydrogen sulfide gas and nitrogen pass in mist temporary storage tank 6, and mix in mist temporary storage tank 6, obtain mist, the volume ratio of hydrogen sulfide gas and nitrogen is 4:96; At the uniform velocity mist is passed into the speed of 80SCCM from the bottom of sand core funnel, make mist bottom chromium ground-slag end through and with chromium slag powder contact, the top of sand core funnel is connected with flue gas analyzer, and the tail gas produced after reaction is discharged from the top of reaction bed and passed into flue gas analyzer;
4, when flue gas analyzer detect in tail gas have hydrogen sulfide time, the tail gas that flue gas analyzer gas outlet is discharged is arrived the Ca (OH) of 1mol/L immediately
2in alkali lye, when the concentration that flue gas analyzer detects hydrogen sulfide reaches 10 ~ 20mg/m3, stop passing into mist.
Concentration of hydrogen sulfide/hydrogen sulfide initial concentration × 100% of hydrogen sulfide removal rate=react away
Hydrogen sulfide initial concentration: before reaction starts, mist is directly passed into inside flue gas analyzer by the road, and without reaction bed, the data that when flue gas analyzer is stablized, side obtains are hydrogen sulfide initial concentration.Namely also hydrogen sulfide gas or the gas containing hydrogen sulfide and nitrogen are (4 ~ 6) with volume ratio: (94 ~ 96) are mixed to get the concentration of mist hydrogen sulfide.
The concentration of hydrogen sulfide reacted away: hydrogen sulfide initial concentration deducts the concentration (10 ~ 20mg/m3) detecting hydrogen sulfide through reaction bed flue gas analyzer.
Through the method for the present embodiment, hydrogen sulfide removal rate can reach 91% ~ 92%.
embodiment 3
Utilize the device described in embodiment 1 to carry out removing the method for hydrogen sulfide, comprise step as follows:
1, chromium slag is dry, makes the water content control of chromium slag at 5wt%, then pulverizes, and crosses 40 mesh sieves, makes chromium ground-slag end, and take 0.5g chromium ground-slag end and be evenly placed on the core filter plate of sand core funnel, the tiling thickness at chromium ground-slag end is 2 ㎝;
2, reaction bed be heated to 40 DEG C in water-bath and keep constant temperature;
3, open the control valve of control valve and the control gas flow rate between pending gas storage tank and mist temporary storage tank between nitrogen storage tank and mist temporary storage tank simultaneously, observe Flow Measurement Display Meter, regulate flow velocity size, hydrogen sulfide gas and nitrogen pass in mist temporary storage tank 6, and mix in mist temporary storage tank 6, obtain mist, the volume ratio of hydrogen sulfide gas and nitrogen is 5:95, the bottom of sand core funnel at the uniform velocity passes into mist with the speed of 90SCCM, make mist bottom chromium ground-slag end through and with chromium slag powder contact, the top of sand core funnel is connected with flue gas analyzer, the tail gas produced after reaction is discharged from the top of reaction bed and is passed into flue gas analyzer,
4, when flue gas analyzer detect in tail gas have hydrogen sulfide time, the tail gas that flue gas analyzer gas outlet is discharged is passed into the Ca (OH) of 1mol/L
2in alkali lye, when the concentration that flue gas analyzer detects hydrogen sulfide reaches 10 ~ 20mg/m3, stop passing into mist.
Through the method for the present embodiment, hydrogen sulfide gas clearance can reach 92% ~ 93%.
embodiment 4
Utilize the device described in embodiment 1 to carry out removing the method for hydrogen sulfide, comprise step as follows:
1, chromium slag is dry, makes the water content control of chromium slag at 8wt%, then pulverizes, and crosses 100 mesh sieves, makes chromium ground-slag end, and take 1g chromium ground-slag end and be evenly placed on the core filter plate of sand core funnel, the tiling thickness at chromium ground-slag end is 3 ㎝;
2, reaction bed be heated to 50 DEG C in water-bath and keep constant temperature;
3, open the control valve of control valve and the control gas flow rate between pending gas storage tank and mist temporary storage tank between nitrogen storage tank and mist temporary storage tank simultaneously, observe Flow Measurement Display Meter, regulate flow velocity size, hydrogen sulfide gas and nitrogen pass in mist temporary storage tank 6, and mix in mist temporary storage tank 6, obtain mist, the volume ratio of hydrogen sulfide gas and nitrogen is 6:96; At the uniform velocity mist is passed into the speed of 95SCCM from the bottom of sand core funnel, make mist bottom chromium ground-slag end through and with chromium slag powder contact, the top of sand core funnel is connected with flue gas analyzer, and the tail gas produced after reaction is discharged from the top of reaction bed and passed into flue gas analyzer;
4, when flue gas analyzer detect in tail gas have hydrogen sulfide time, the tail gas that flue gas analyzer gas outlet is discharged is passed into the Ca (OH) of 1mol/L
2in alkali lye, when the concentration that flue gas analyzer detects hydrogen sulfide reaches 10 ~ 20mg/m3, stop passing into mist.
Through the method for the present embodiment, hydrogen sulfide gas clearance can reach 92% ~ 93%.
embodiment 5:
Chromium slag removes a method for hydrogen sulfide, and method is with embodiment 2, and difference is,
Chromium slag is dry, and make the water content control of chromium slag at 12wt%, the gas containing hydrogen sulfide and the volume ratio of nitrogen are 5:96; The speed that mist passes into reaction bed is 95SCCM.
Through the method for the present embodiment, hydrogen sulfide gas clearance can reach 96% ~ 98%.
embodiment 6:
Chromium slag removes a method for hydrogen sulfide, and method is with embodiment 2, and difference is,
Chromium slag is dry, and make the water content control of chromium slag at 24wt%, the gas containing hydrogen sulfide and the volume ratio of nitrogen are 6:95; The speed that mist passes into reaction bed is 100SCCM.
Through the method for the present embodiment, hydrogen sulfide gas clearance can reach 94% ~ 96%.
Claims (5)
1. utilize chromium slag to remove a method for hydrogen sulfide, comprise step as follows:
(1) get chromium slag, drying, pulverizing, cross 20 ~ 100 mesh sieves, make chromium ground-slag end, be evenly laid in reaction bed at chromium ground-slag end, the tiling thickness at described chromium ground-slag end is 2 ~ 5 ㎝; After dry, the water content of chromium slag is within the scope of 0 ~ 24wt%;
(2) heat reaction bed, make chromium slag powder temperature reach 30 ~ 50 DEG C and keep constant temperature;
(3) mix with nitrogen by hydrogen sulfide gas or containing the gas of hydrogen sulfide, obtain mist, described hydrogen sulfide gas or contain the gas of hydrogen sulfide and the volume ratio of nitrogen is (5 ~ 6): (95 ~ 96); At the uniform velocity mist is passed into the speed of 80 ~ 100SCCM from the bottom of reaction bed, make mist bottom chromium ground-slag end through and with chromium slag powder contact, the top of reaction bed is connected with flue gas analyzer, and the tail gas produced after reaction is discharged from the top of reaction bed and passed into flue gas analyzer;
(4) when flue gas analyzer detect in tail gas have hydrogen sulfide time, the tail gas that flue gas analyzer gas outlet is discharged is passed in alkali lye immediately, when flue gas analyzer detect the concentration of hydrogen sulfide reach 10 ~ 20mg/m3 time, stop passing into mist.
2. remove the method for hydrogen sulfide according to the chromium slag that utilizes described in claim 1, it is characterized in that, described is more than 1% containing the percent by volume of hydrogen sulfide in the gas of hydrogen sulfide.
3. remove the method for hydrogen sulfide according to the chromium slag that utilizes described in claim 1, it is characterized in that, described alkali lye is the Ca (OH) of 1mol/L
2alkali lye.
4. the method utilizing chromium slag to remove hydrogen sulfide according to claim 1, it is characterized in that, the speed that step (3) mist passes into reaction bed is 90 ~ 95SCCM.
5. the method utilizing chromium slag to remove hydrogen sulfide according to claim 1, it is characterized in that the heating of step (2) described reaction bed is placed in by reaction bed on water-bath or heat collecting type constant-temperature heating magnetic stirring apparatus to heat, described reaction bed is sand core funnel, and the aperture of core filter plate is less than 150 μm.
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| CN113817484A (en) * | 2021-09-14 | 2021-12-21 | 中国矿业大学 | Method for treating sulfur-containing organic solid waste and chromite processing waste residue through hydrogenation pyrolysis |
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|---|---|---|---|---|
| CN1962096A (en) * | 2005-11-10 | 2007-05-16 | 中国科学院过程工程研究所 | Chromium slag processing method for chemical-biological coupling reduction of hexavalent chrome |
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|---|---|---|---|---|
| CN1962096A (en) * | 2005-11-10 | 2007-05-16 | 中国科学院过程工程研究所 | Chromium slag processing method for chemical-biological coupling reduction of hexavalent chrome |
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