CN201116307Y - Free acid removing device in waste acid purifying technique - Google Patents
Free acid removing device in waste acid purifying technique Download PDFInfo
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- CN201116307Y CN201116307Y CNU2007200875776U CN200720087577U CN201116307Y CN 201116307 Y CN201116307 Y CN 201116307Y CN U2007200875776 U CNU2007200875776 U CN U2007200875776U CN 200720087577 U CN200720087577 U CN 200720087577U CN 201116307 Y CN201116307 Y CN 201116307Y
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- free acid
- pipeline
- interchanger
- retort
- acid
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Abstract
The utility model relates to a free acid removing device. The free acid removing device in the waste acid purifying process is characterized in that the free acid removing device comprises a first heat interchanger (2), a free acid removing reaction pot (4), an agitator (6), a flocculation reactor (8), a reaction sedimentation tank (10), a sludge pump (12) and a second heat interchanger (14), the other end of a heat waste fluid pipe (3) is communicated with the free acid removing reaction pot (4), the agitator (6) is arranged in the free acid removing reaction pot (4), and the outlet end of an iron oxide powder delivery pipe (5) is communicated with the free acid removing reaction pot (4); one end of a first pipeline (7) is communicated with the overflow port of the free acid removing reaction pot (4), the other end of the first pipeline (7) is communicated with the flocculation reactor (8), the flocculation reactor (8) is arranged in the reaction sedimentation tank (10), one end of a third pipeline (7) is communicated with the overflow port of the reaction sedimentation tank (10), and the other end thereof is communicated with the cooling inlet end of the second heat interchanger (14). The free acid removing device of the utility model has the advantage of low cost.
Description
Technical field
The utility model belongs to iron and steel and chemical field, is specifically related to a kind of hydrochloric acid pickling waste liquor regenerating unit that is applicable to and for what improve that the brown iron oxide quality done spent acid is carried out free acid removal device in the purification process.
Background technology
Iron and steel or chemical enterprise hydrochloric acid pickling waste liquor (abbreviation spent acid), generally adopt spray roasting that spent acid is regenerated, spent acid is atomisation in stoving oven, under 550-650 ℃ hot environment, iron protochloride is decomposed into hydrogen chloride gas and brown iron oxide, hydrogen chloride gas reclaims and is used for the pickling unit through absorb forming regenerating acid, and brown iron oxide is recycled, and is mainly used in coating and magneticsubstance industry, the powder metallurgy industry is used as raw material.For satisfying the requirement of magneticsubstance to the iron powder quality, in spent acid sprays into stoving oven before, need purify spent acid solution, to satisfy the requirement of producing the high-purity mangesium oxide iron powder.Traditional process using is to spent acid heating and the huge free acid removal device of 1 cover is set is that cheet scrap soaks molten tower, drops into cheet scrap at this, and the spent acid of heating is from the bottom to top by cheet scrap, at this cheet scrap with the free acid reaction and obtain removal.Chemical equation is as follows:
Fe+2HCl＝FeCl
2+H2↑
Spent acid adds ammoniacal liquor through the free acid removal device after cool off the back, and through aeration oxidation production ironic hydroxide, drop into coagulant aids again, form bigger flco, impurities such as colloid silicon in the spent acid are adsorbed, spent acid through post precipitation is purified, and sprays into stoving oven, can produce highly purified brown iron oxide.The type soak molten tower, not only equipment is huge but also need lifting magnet crane to be used to lift by crane cheet scrap, and because reaction produces hydrogen, can produce hidden danger.
Summary of the invention
The purpose of this utility model is to provide the free acid removal device in the low spent acid purification process of a kind of cost.
To achieve these goals, the technical solution of the utility model is: the free acid removal device in the spent acid purification process, it is characterized in that it comprises first interchanger 2, free acid is removed retort 4, agitator 6, flocculation reactor 8, reaction settling basin 10, sludge pump 12, second interchanger 14, the heat-conduction medium inlet end of first interchanger 2 links to each other with vapour pipe, the heat-conduction medium exit end of first interchanger 2 links to each other with condensate pipe, the heating inlet end of first interchanger 2 is connected with hydrochloric acid pickling waste liquor pipe 1, the heating exit end of first interchanger 2 is connected with an end of thermal effluent pipe 3, the other end of thermal effluent pipe 3 is removed retort 4 with free acid and is connected, free acid is removed in the retort 4 and is provided with agitator 6, and the exit end of brown iron oxide transfer lime 5 is removed retort 4 with free acid and is connected; One end of first pipeline 7 is connected with the overflow port that free acid is removed retort 4, the other end of first pipeline 7 is connected with flocculation reactor 8, flocculation reactor 8 is arranged in the reaction settling basin 10, the bottom of flocculation reactor 8 is provided with opening 9, one end of second pipeline 11 is connected with the bottom of reaction settling basin 10, the other end of second pipeline 11 is removed retort 4 with free acid and is connected, and second pipeline 11 is provided with valve, sludge pump 12; One end of the 3rd pipeline 13 is connected with the overflow port of reaction settling basin 10, and the other end of the 3rd pipeline 13 is connected with the cooling inlet end of second interchanger 14, and the coolant outlet end of second interchanger 14 is connected with an end of the 4th pipeline 15.
The beneficial effects of the utility model are:
1) this device is compared with traditional free acid removal device (being that cheet scrap soaks molten tower), and equipment volume is little, saving equipment and civil engineering costs.
2) substitute cheet scrap with brown iron oxide, price is lower than useless price of cutting edge, and the most of brown iron oxide that drops into obtains regeneration at acid purification system, can reuse.
3) this device does not produce hydrogen, can reduce incendiary danger.
4) adopt this device after, the neutralization reaction jar in the follow-up spent acid purification process does not need pressurized air, saves the pressurized air consumption.
5) flocculation reactor is arranged in the reaction settling basin, is provided with opening at the bottom of the flocculation reactor, and reaction settling basin is used for the precipitation of unreacted brown iron oxide, prevents to stop up second interchanger (being water cooler).
Description of drawings
Fig. 1 is a structural representation of the present utility model
Among the figure: 1-hydrochloric acid pickling waste liquor pipe, 2-first interchanger, 3-thermal effluent pipe, the 4-free acid is removed retort, 5-brown iron oxide transfer lime, 6-agitator, 7-first pipeline, 8-flocculation reactor, 9-opening, the 10-reaction settling basin, 11-second pipeline, 12-sludge pump, 13-the 3rd pipeline, 14-second interchanger, 15-the 4th pipeline.
Embodiment
As shown in Figure 1, free acid removal device in the spent acid purification process, it comprises first interchanger 2, free acid is removed retort 4, agitator 6, flocculation reactor 8, reaction settling basin 10, sludge pump 12, second interchanger 14, the heat-conduction medium inlet end of first interchanger 2 links to each other with vapour pipe, the heat-conduction medium exit end of first interchanger 2 links to each other with condensate pipe, the heating inlet end of first interchanger 2 is connected with hydrochloric acid pickling waste liquor pipe 1, the heating exit end of first interchanger 2 is connected with an end of thermal effluent pipe 3, the other end of thermal effluent pipe 3 is removed retort 4 with free acid and is connected, free acid is removed in the retort 4 and is provided with agitator 6, and the exit end of brown iron oxide transfer lime 5 is removed retort 4 with free acid and is connected; One end of first pipeline 7 is connected with the overflow port that free acid is removed retort 4, the other end of first pipeline 7 is connected with flocculation reactor 8, flocculation reactor 8 is arranged in the reaction settling basin 10, the bottom of flocculation reactor 8 is provided with opening 9, one end of second pipeline 11 is connected with the bottom of reaction settling basin 10, the other end of second pipeline 11 is removed retort 4 with free acid and is connected, and second pipeline 11 is provided with valve, sludge pump 12; One end of the 3rd pipeline 13 is connected with the overflow port of reaction settling basin 10, the other end of the 3rd pipeline 13 is connected with the cooling inlet end of second interchanger 14, the coolant outlet end of second interchanger 14 is connected with an end of the 4th pipeline 15, and the other end of the 4th pipeline 15 is connected with the neutralization reaction jar of next step technology; The cold transmission medium inlet end of second interchanger 14 links to each other with the cooling water-supply pipe, the cold transmission medium exit end of second interchanger 14 with cool back water pipe and link to each other.
Free acid is removed technology:
1) hydrochloric acid pickling waste liquor enters after first interchanger is heated to 80-90 ℃ in the free acid removal retort, free acid is removed in the retort and is added brown iron oxide, the iron powder dosage is 40-50g/l (spent acid solution), hydrochloric acid pickling waste liquor and brown iron oxide mix, react, remove the free hydrochloric acid in the hydrochloric acid pickling waste liquor, obtain removing the spent acid of free hydrochloric acid;
Following reaction takes place in the free hydrochloric acid in this brown iron oxide and hydrochloric acid pickling waste liquor, and chemical equation is as follows:
Fe
2O
3+6HCl＝2FeCl
3+3H
2O，
Through reaction, free hydrochloric acid is effectively removed;
2) enter in the flocculation reactor after the spent acid overflow of step 1) removal free hydrochloric acid, flocculation reactor is arranged in the reaction settling basin, be provided with opening at the bottom of the flocculation reactor, spent acid in the flocculation reactor is taken advantage of a situation and is entered the reaction settling basin precipitation, sedimentation time 10-15 hour, through the reaction settling basin post precipitation, unreacted brown iron oxide is deposited in the reaction settling basin bottom, unreacted brown iron oxide promotes through pipeline, sludge pump and gets back in the free acid removal retort, the supernatant liquor of reaction settling basin overflow enters second interchanger and is cooled to 50-55 ℃, must cool off spent acid solution;
3) step 2) the cooling spent acid solution enters in the neutralization reaction jar of next step technology, enters next step technology (spent acid purification process).
Claims (1)
1. the free acid removal device in the spent acid purification process, it is characterized in that it comprises first interchanger (2), free acid is removed retort (4), agitator (6), flocculation reactor (8), reaction settling basin (10), sludge pump (12), second interchanger (14), the heat-conduction medium inlet end of first interchanger (2) links to each other with vapour pipe, the heat-conduction medium exit end of first interchanger (2) links to each other with condensate pipe, the heating inlet end of first interchanger (2) is connected with hydrochloric acid pickling waste liquor pipe (1), the heating exit end of first interchanger (2) is connected with an end of thermal effluent pipe (3), the other end of thermal effluent pipe (3) is removed retort (4) with free acid and is connected, free acid is removed in the retort (4) and is provided with agitator (6), and the exit end of brown iron oxide transfer lime (5) is removed retort (4) with free acid and is connected; One end of first pipeline (7) is connected with the overflow port that free acid is removed retort (4), the other end of first pipeline (7) is connected with flocculation reactor (8), flocculation reactor (8) is arranged in the reaction settling basin (10), the bottom of flocculation reactor (8) is provided with opening (9), one end of second pipeline (11) is connected with the bottom of reaction settling basin (10), the other end of second pipeline (11) is removed retort (4) with free acid and is connected, and second pipeline (11) is provided with valve, sludge pump (12); One end of the 3rd pipeline (13) is connected with the overflow port of reaction settling basin (10), the other end of the 3rd pipeline (13) is connected with the cooling inlet end of second interchanger (14), and the coolant outlet end of second interchanger (14) is connected with an end of the 4th pipeline (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200875776U CN201116307Y (en) | 2007-10-16 | 2007-10-16 | Free acid removing device in waste acid purifying technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200875776U CN201116307Y (en) | 2007-10-16 | 2007-10-16 | Free acid removing device in waste acid purifying technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201116307Y true CN201116307Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200875776U Expired - Lifetime CN201116307Y (en) | 2007-10-16 | 2007-10-16 | Free acid removing device in waste acid purifying technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201116307Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858843A (en) * | 2016-05-27 | 2016-08-17 | 河南师范大学 | Ammonia nitrogen recovery system for hair product wastewater and operating method of system |
| CN107098529A (en) * | 2017-04-26 | 2017-08-29 | 西可林控制系统(上海)有限公司 | The no-drain treatment method and its device of a kind of hydrochloric acid pickling waste liquor |
-
2007
- 2007-10-16 CN CNU2007200875776U patent/CN201116307Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858843A (en) * | 2016-05-27 | 2016-08-17 | 河南师范大学 | Ammonia nitrogen recovery system for hair product wastewater and operating method of system |
| CN107098529A (en) * | 2017-04-26 | 2017-08-29 | 西可林控制系统(上海)有限公司 | The no-drain treatment method and its device of a kind of hydrochloric acid pickling waste liquor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080917 |