CN103553258B - Safe recycling treatment method of waste iron/steel pickling acid - Google Patents
Safe recycling treatment method of waste iron/steel pickling acid Download PDFInfo
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- CN103553258B CN103553258B CN201310576822.XA CN201310576822A CN103553258B CN 103553258 B CN103553258 B CN 103553258B CN 201310576822 A CN201310576822 A CN 201310576822A CN 103553258 B CN103553258 B CN 103553258B
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Abstract
The invention relates to a safe recycling treatment of waste iron/steel pickling acid and belongs to the technical field of recycling treatment of waste acid. The safe recycling treatment method of the waste iron/steel pickling acid adopts a pipeline mixer for safe recycling treatment and comprises the following process steps of: 1) neutralizing, namely, pumping lime size and waste iron/steel pickling acid into the pipeline mixer and neutralizing; 2) oxidizing, namely, adding ozone or hydrogen peroxide to the pipeline mixer and oxidizing while neutralizing, and stopping oxidization until the solution is of a grass green color; 3) heat treatment, namely, heating to 90 to 120 DEG C and treating at a high temperature after neutralizing and oxidizing; and 4) filtering, namely, mechanically filtering through a plate-and-frame filter press, and then recycling the filter cake. The safe recycling treatment method which utilizes the pipeline mixer is small in equipment investment, small in floor area, simple in process, convenient to operate, easy to control and low in cost, turns waste into wealth, and is environmentally-friendly, and high in treatment efficiency; moreover, the raw materials are easily available.
Description
Technical field
The invention belongs to spent acid resource treatment technique field, particularly relate to a kind of pickling iron and steel spent acid resource utilization security processing.
Background technology
At present, along with the development of steel industry, metal products need in process of production to steel surface oxide skin use hydrochloric acid to clean to produce in acid cleaning process a large amount of waste liquid main components be its content of free acid, iron protochloride and water with acid cleaning process, service temperature, steel material, the different and different general chloride containings ferrous iron 20-26% of specification, all the other are water for free acid 5-8%.
Three kinds of modes that the existing processing of this type of waste liquid mainly adopts: the one, acid-base neutralisation method, the 2nd, high-temperature roasting method, the 3rd,, condensing crystal method.Regeneration of hydrochloric acid method adopts the mode of heat evaporation, spray burning.Domestic hydrochloric acid regenerating device is all the equipment of introducing mostly.General basic employing spray roasting and the fluidized bed process processed.The general medium-sized and small enterprises of problem such as this art breading one-time investment is large, operation and maintenance cost is high, structure deteriorate is serious are difficult to bear.Therefore, domestic medium-sized and small enterprises discharge after making waste liquid reach emission standard after mostly adopting acid-base neutralisation method to process, and can not be utilized but this technique produces a large amount of moisture 85% body refuse, produce the pollution of secondary to environment.Not treated discharge can be stopped up water drain, stops up long-pending riverbed, harm fish production.Stack land occupation on land, contaminate environment, waste resource.Adopt fluidized bed process and spray roasting, every complete equipment is invested ten thousand yuan of about 1000-2000, exists and processes the technical problems such as spent acid one-time investment is large, operation and maintenance cost is high, equipment is fragile, spent acid treatment capacity is low, and general medium-sized and small enterprises are difficult to bear.
Summary of the invention
The present invention provides a kind of pickling iron and steel spent acid resource utilization security processing for solving the technical problem existing in known technology.
The object of this invention is to provide a kind of line mixer that adopts and carry out resource utilization safe handling, there is facility investment little, floor space is few, and technique is simple, easy to operate, control easily, raw material is easy to get, with low cost, turns waste into wealth, free from environmental pollution, the pickling iron and steel spent acid resource utilization security processing of processing efficiency high.
The technical scheme that pickling iron and steel spent acid resource utilization security processing of the present invention is taked is:
A kind of pickling iron and steel spent acid resource utilization security processing, is characterized in: pickling iron and steel spent acid employing line mixer is oxidized neutralization method and carries out resource utilization safe handling, and treatment process comprises following processing step:
1) neutralization
Lime slurry and pickling iron and steel spent acid are squeezed into line mixer simultaneously, carry out neutralization reaction;
2) oxidation
When lime slurry and pickling iron and steel spent acid are squeezed into line mixer and are carried out neutralization reaction, in management mixing tank, add ozone or hydrogen peroxide to be oxidized, be oxidizing to when solution is grass green and finish;
3) heat treated
After neutralization oxidation, be heated to 90-120 DEG C and carry out pyroprocessing;
4) filter
After heat treated completes, adopt plate-and-frame filter press to carry out mechanical filter, filter cake carries out recycling again.
Pickling iron and steel spent acid resource utilization security processing of the present invention can also adopt following technical scheme:
Described pickling iron and steel spent acid resource utilization security processing, is characterized in: in and time, the proportioning of lime slurry and pickling iron and steel spent acid is: pickling iron and steel spent acid add-on be the complete consumption of neutralization reaction 1-1.03 doubly.
Described pickling iron and steel spent acid resource utilization security processing, is characterized in: when oxidation, in line mixer, the pH value of solution is 6.5-7.5.
Described pickling iron and steel spent acid resource utilization security processing, is characterized in: when heat treated, adopt high-pressure water vapor to carry out heat treated in line mixer, Heating temperature is 95-105 DEG C.
Described pickling iron and steel spent acid resource utilization security processing, is characterized in: when heat treated, pH value is 5.5-7, then adopts plate-and-frame filter press to carry out mechanical filter.
Advantage and positively effect that the present invention has are:
Pickling iron and steel spent acid resource utilization security processing is owing to having adopted the brand-new technical scheme of the present invention, compared with prior art, the present invention adopts line mixer to carry out resource utilization safe handling, there is technique simple, easy to operate, control easily, raw material is easy to get, with low cost, turn waste into wealth, processing efficiency advantages of higher.
The operational path that the present invention adopts and the sinter process equal treatment capacity facility investment of comparing only have 2,000,000 yuan, and equipment is not fragile, operation and maintenance cost is almost nil.Energy consumption is 1/4th of sinter process, and equipment does not simply have the pollution of secondary to environment.Reach the object of protection of the environment and reclaiming resource.And the simple floor space of technique of the present invention is little, spent acid treatment capacity turns waste into wealth greatly, has reduced resource consumption.
Brief description of the drawings
Fig. 1 is that line mixer of the present invention carries out pickling iron and steel spent acid resource utilization safe handling structural representation;
Fig. 2 is spray roasting process flow sheet.
In figure, 1-calcination stove, 2-tornado dust collector, 3-preconcentrator, 4-pump, 5-absorption tower, 6-water tank, 7-waste gas exhaust blower, 8-washing tower and gas shaft, 9-ferric oxide bunker, in 10-Z 250 taphole, 11-steam-in, 12-ozone or hydrogen peroxide entrance, 13-coal liquid entrance, 14-pickling iron and steel spent acid entrance.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Consult accompanying drawing 1.
Embodiment 1
A kind of pickling iron and steel spent acid resource utilization security processing, is characterized in: pickling iron and steel spent acid employing line mixer is oxidized neutralization method and carries out resource utilization safe handling, and treatment process comprises following processing step:
1) neutralization: coal slurries and pickling iron and steel spent acid are squeezed into line mixer simultaneously, carry out neutralization reaction; The proportioning of coal slurries and pickling iron and steel spent acid is: pickling iron and steel spent acid add-on is 1-1.03 times of the complete consumption of neutralization reaction.
2) oxidation: when coal slurries and pickling iron and steel spent acid are squeezed into line mixer and carried out neutralization reaction, add ozone or hydrogen peroxide to be oxidized in management mixing tank, regulating pH value is 6.0, is oxidizing to when solution is grass green and finishes;
3) heat treated: after neutralization oxidation, adopt high-pressure water vapor to heat in line mixer, Heating temperature is 100 DEG C and carries out pyroprocessing;
4) filter: after heat treated completes, add sodium hydroxide to regulate pH value for 7-8, then adopt box plate-and-frame filter press to carry out mechanical filter, filter cake carries out recycling again.
After filter cake after filtration is air-dry, produce Z 250.Filtrate regulates PH=7-8 reach emission standard discharge or return to lime waste pulp pond with pump and wait for secondary mixing reuse.
Details are as follows for the specific implementation process of the present embodiment:
Pickling iron and steel spent acid resource utilization security processing, Calcium Carbide Ash waste pulp is directly added after by reducing valve adjust flux in 200 type line mixers (12 joints are shown in accompanying drawing) simultaneously to adding in first segment line mixer pickling iron and steel spent acid (ratio of mortar and spent acid is 1.45:3) to regulate PH=6 to enter in second section mixing tank simultaneously to adding in mixing tank pressurized air (ozone or hydrogen peroxide) to carry out mixed oxidization to solution and is grass green and enters Section of three mixing tank and add water vapour to be heated to mixeding liquid temperature to reach 100 degree with 3 cun of dirty mortar pumps of diving, mixed solution reaction finishes.Carry out 3000 kilograms of solid-liquid separation mud filter cake productive rates per hour with the pressure filter that filtration area is 200 square metres, after air-dry 1800 kilograms of content 70-85% Z 250 products.Plate-and-frame filter press filtrate is adjusted PH=7-8 and is reached discharge after industrial wastewater discharge standard (or enter mortar pool reuse) to neutrality.
The present embodiment adopts line mixer to carry out resource utilization safe handling, has the positively effects such as described technique simple operations is convenient, raw material is easy to get, energy consumption is few, with low cost, equipment is not fragile, operation and maintenance cost is almost nil, processing efficiency is high.Equipment used of the present invention does not simply have secondary environmental pollution, and spent acid treatment capacity turns waste into wealth greatly, has reached the object of protection of the environment and reclaiming resource.
Claims (2)
1. a pickling iron and steel spent acid resource utilization security processing, is characterized in that: pickling iron and steel spent acid employing line mixer is oxidized neutralization method and carries out resource utilization safe handling, and treatment process comprises following processing step:
1) neutralization
Lime slurry and pickling iron and steel spent acid are squeezed into line mixer simultaneously, carry out neutralization reaction;
2) oxidation
When lime slurry and pickling iron and steel spent acid are squeezed into line mixer and are carried out neutralization reaction, in management mixing tank, add ozone or hydrogen peroxide to be oxidized, be oxidizing to when solution is grass green and finish;
3) heat treated
After neutralization oxidation, adopt high-pressure water vapor to carry out heat treated in line mixer, Heating temperature is 95-105 DEG C;
4) filter
After heat treated completes, adopt plate-and-frame filter press to carry out mechanical filter, filter cake carries out recycling again.
2. pickling iron and steel spent acid resource utilization security processing according to claim 1, is characterized in that: after heat treated, add liming to regulate pH value for 7-8, then adopt plate-and-frame filter press to carry out mechanical filter.
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| CN201310576822.XA CN103553258B (en) | 2013-11-13 | 2013-11-13 | Safe recycling treatment method of waste iron/steel pickling acid |
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| CN201310576822.XA CN103553258B (en) | 2013-11-13 | 2013-11-13 | Safe recycling treatment method of waste iron/steel pickling acid |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105439343B (en) * | 2014-09-02 | 2018-08-03 | 天津市天利达环保科技有限公司 | A kind of soda acid changing rejected material to useful resource treatment process |
| CN104529032A (en) * | 2014-12-15 | 2015-04-22 | 胡志刚 | Treatment method of hydrochloric acid waste liquid from steel pickling |
| CN105254076A (en) * | 2015-11-16 | 2016-01-20 | 苏州南风优联环保工程有限公司 | Simple and efficient nickel-containing wastewater treating process |
| CN105540937A (en) * | 2016-02-04 | 2016-05-04 | 卢玉柱 | Treatment method of steel processing waste dangerous chemicals and product calcium-base ferrous hydroxide thereof |
| CN105906174A (en) * | 2016-05-04 | 2016-08-31 | 卢玉柱 | Method for ferric hydroxide water purifier preparation with sludge after steel pickling waste water lime neutralization |
| CN106564863B (en) * | 2016-11-15 | 2018-10-23 | 四川龙蟒钛业股份有限公司 | Hydrogen peroxide additive amount control device in concentrating waste acid iron removal |
| CN109205561B (en) * | 2018-09-25 | 2020-10-30 | 中宁县峰之源农业发展有限公司 | Industrial concentrated hydrochloric acid recovery method |
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Effective date of registration: 20170324 Address after: Caigongzhuang Daegu 301606 Tianjin city Jinghai County town east toll station Patentee after: Tianjin Fengyuan Environmental Protection Technology Co., Ltd. Address before: Daegu 301606 Tianjin city Jinghai County Town Village Patentee before: Lu Yuzhu |
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Effective date of registration: 20220406 Address after: 301606 No. 39, row 3, zone 4, Datun village, Daqiuzhuang Town, Jinghai District, Tianjin Patentee after: Lu Shukun Address before: 301606 east of caigongzhuang toll station, Daqiuzhuang Town, Jinghai County, Tianjin Patentee before: TIANJIN FENG YUAN ENVIRONMENTAL PROTECTION SCIENCE AND TECHNOLOGY CO.,LTD. |