CN104761002A - A preparing process of energy-saving environmental-friendly type modified polymeric ferric sulfate - Google Patents
A preparing process of energy-saving environmental-friendly type modified polymeric ferric sulfate Download PDFInfo
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Abstract
The invention relates to a preparing process of energy-saving environmental-friendly type modified polymeric ferric sulfate. The process includes following steps: adding polyaluminum chloride waste slag and a sulfuric acid type ferrous sulfate-acid mixture into a pretreatment kettle, heating, stirring, reacting and performing filter pressing to obtain a first reaction liquid material; adding green vitriol and a sulfuric acid type ferrous sulfate-acid mixture into a pretreatment kettle and stirring to obtain a second reaction liquid material; and adding the first and second reaction liquid materials into a sealed acid-resistant pressure-resistant reactor, adding a catalyst solution and a cocatalyst solution, feeding oxygen, heating, reacting, and cooling to obtain a modified polymeric ferric sulfate solution. The beneficial effects of the process are that the polymeric ferric sulfate containing a trace amount of aluminum and silicon is high in added value, has flocculation effects superior to flocculation effects of polymeric ferric sulfate, and can be used for treatment of high-turbidity high-COD printing and dying waste water; production raw materials are all industrial waste materials; the raw material cost is reduced; reaction time is shortened; and the time cost is saved.
Description
Technical field
The present invention relates to a kind of preparation technology of energy saving and environment friendly improved PFS.
Background technology
Molysite and aluminium salt, as traditional inorganic flocculating agent, have now become two class water-purifying materials the most frequently used on sewage-treating agent market.And bodied ferric sulfate (PFS) and poly-ferric chloride are for have developed Ferric Salt Flocculants at present, the product obtaining practical application has been bodied ferric sulfate.When bodied ferric sulfate is used for coagulating treatment, because its solubility product constant is little, hydrolysis rate is fast, and flco is intensive and quality large, and dehydration property is good, suitable water body pH wide ranges, for the trade effluents such as printing and dyeing, papermaking decolouring, except COD effect better.But bodied ferric sulfate acidity is comparatively strong, has corrodibility, and usually with the phenomenon of supernatant liquor yellowing during its process waste water, affecting effluent color dilution, using because which limit it.
At present, the industrialization production method of PFS is mainly two kinds, and one is oxidizing method, adopts the oxidizing sulfuric acid type such as sodium chlorate, clorox or hydrogen peroxide ferrous, suitable control ferrous sulfate and sulfuric acid ratio, to prepare the product that iron level and basicity meet GB 14591-93.The second is catalytic oxidation, namely adopts Sodium Nitrite to be catalyzer, passes into oxygen and sulfuric acid type ferrous oxidation to be become after ferric sulfate hydrolytic polymerization again.The advantage of oxidizing method is that the reaction times is short, oxidation efficiency is high, but the expense of raw materials of oxygenant is expensive, it is 137 yuan (oxygenant is for sodium chlorate) that CN101037234A analyzes the oxidant cost of producing bodied ferric sulfate per ton use, raw materials cost is too high, is unfavorable for that the industrialization of enterprise is produced.Second method, i.e. catalytic oxidation, because its production cost is low, become the preferred polyaluminum sulfate process for making iron of enterprise at present, but the catalyzer added in catalytic oxidation can at sour gas such as step of reaction liberating nitrogen oxide compounds, and the reaction times of the method is longer, be generally 4 ~ 5h, in actual production, in order to ensure ferrous oxidation ratio, its reaction times is that 8 ~ 10h is even longer.
In sum, take effective improving technique, make PFS flocculating effect better; Optimized production process, cleaner production becomes the Main way of bodied ferric sulfate future development.For overcoming the above problems, the energy saving and environment friendly improved PFS of one prepared by the present invention, the bodied ferric sulfate added value of introducing Trace Aluminum, silicon is high, and flocculating effect is better than bodied ferric sulfate, can be used for the process of high turbid high COD dyeing waste water; In production technique, the raw materials for production of bodied ferric sulfate are industrial waste, adopt catalytic oxidation, eliminate the expense of the oxygenants such as expensive sodium chlorate or hydrogen peroxide, economize in raw materials cost, add promotor and add ferrous efficiency by recycle pump violent stirring, the reaction times is made to shorten to 2.5 ~ 4h from 8 ~ 10h, save time cost, finally, the sour gas such as reactor upper gas pipeline connects alkali liquor absorption tower, the oxynitride that absorption reaction produces, decrease the discharge of obnoxious flavour.
Summary of the invention
The technical problem to be solved in the present invention is: based on the problems referred to above, the invention provides a kind of preparation technology of energy saving and environment friendly improved PFS.
The present invention solves the technical scheme that its technical problem adopts: a kind of preparation technology of energy saving and environment friendly improved PFS, comprises the following steps:
(1) polyaluminium waste slag of aluminum and sulfuric acid type ferrous acid are dropped into pretreatment reaction still, be warming up to 45 ~ 65 DEG C, stirring reaction 0.5 ~ 1h, press filtration, liquid material one must be reacted;
(2) green vitriol and sulfuric acid type ferrous acid are dropped into pretreatment reaction still, stir 0.5 ~ 1h under normal temperature, liquid material two must be reacted;
(3) drop in airtight acidproof resistance to compression reactor by reaction liquid material one and reaction liquid material two, ON cycle pump, adds catalyst solution and promotor solution, pass into oxygen, be warming up to 55 ~ 90 DEG C, reaction 1.5 ~ 2h, cools to obtain improved PFS solution.
Further, in step (1), polyaluminium chloride residue is produce the semi-solid material of polymerize aluminum chloride finished product bottom residues after press filtration, and polyaluminium chloride residue contains polymerize aluminum chloride and a small amount of silicon, and its aluminium content is with Al
2o
3count 7 ~ 12%, silicone content is with SiO
2count 3 ~ 7%.
Further, in step (1), the mass ratio of polyaluminium chloride residue and sulfuric acid type ferrous acid is 1:1.5.
Further, the sulfuric acid type ferrous acid in step (1) and step (2), its iron level is with Fe
2o
3count 1 ~ 18%, acidity counts 4 ~ 25% with sulfuric acid.
Further, the iron level of the middle green vitriol of step (2) is with Fe
2o
3count 18 ~ 30%.
Further, the iron level of liquid material two is reacted in step (2) with Fe
2o
3count 12 ~ 18%, basicity is 50 ~ 70%.
Further, in step (3), the mass ratio that adds of reaction liquid material one and reaction liquid material two is 1:5.
Further, the catalyzer in step (3) is Sodium Nitrite, and promotor is sodium iodide.
Further, in step (3), Sodium Nitrite and sodium iodide are made into the mixed aqueous solution of mass concentration difference 25% and 2% by catalyzer and promotor in use, and dosage is 1.5 ~ 2% of reaction liquid material two quality.
Further, in step (3), oxygen intake is excessive, 1.65 ~ 3.3 ‰ of preferred reaction liquid material total mass.
The energy saving and environment friendly improved PFS of finished product is Vandyke brown liquid, and iron level is with Fe
2o
3% counts 11.5 ~ 16%, and aluminium content is with Al
2o
3count 0.5 ~ 0.7%, silicone content is with SiO
2count 0.2 ~ 0.5%, basicity is 9 ~ 14%, insolubles <0.3%.
The invention has the beneficial effects as follows: the bodied ferric sulfate added value of introducing Trace Aluminum, silicon is high, and flocculating effect is better than bodied ferric sulfate, can be used for the process of high turbid high COD dyeing waste water; In production technique, the raw materials for production of bodied ferric sulfate are industrial waste, adopt catalytic oxidation, eliminate the expense of the oxygenants such as expensive sodium chlorate or hydrogen peroxide, economize in raw materials cost, add promotor and add ferrous efficiency by recycle pump violent stirring, the reaction times is made to shorten to 2.5 ~ 4h from 8 ~ 10h, save time cost, finally, the sour gas such as reactor upper gas pipeline connects alkali liquor absorption tower, the oxynitride that absorption reaction produces, decrease the discharge of obnoxious flavour.
Embodiment
The invention will be further described in conjunction with specific embodiments now, and following examples are intended to the present invention instead of limitation of the invention further are described.
Embodiment 1
By 30kg polyaluminium waste slag of aluminum, (aluminium content is with Al
2o
3count 7%, silicone content is with SiO
2count 3%), (iron level is with Fe for 45kg sulfuric acid type ferrous acid
2o
3count 4%, acidity counts 12% with sulfuric acid) mixing input pretreatment reaction still, be warming up to 45 ~ 65 DEG C, stirring reaction 0.5h, press filtration, obtain 50kg and react liquid material one.
By 130kg green vitriol, (iron level is with Fe
2o
3count 20%) (iron level is with Fe with 120kg sulfuric acid type ferrous acid
2o
3% counts 4%, and acidity counts 12% with sulfuric acid) drop into pretreatment reaction still, stir 0.5 ~ 1h under normal temperature, obtain 250kg and react liquid material two.
Put in airtight acidproof resistance to compression reactor by reaction liquid material one and reaction liquid material two, ON cycle pump, add the sodium nitrite solution (containing 2% sodium iodide) that 3.75kg mass concentration is 25%, pass into oxygen, oxygen flow is 0.2m
3/ h, is warming up to 55 ~ 90 DEG C, and reaction 1.5 ~ 2h, cools to obtain improved PFS solution 300kg.
Embodiment 2
By 60kg polyaluminium waste slag of aluminum, (aluminium content is with Al
2o
3count 8%, silicone content is with SiO
2count 4%), (iron level is with Fe for 90kg sulfuric acid type ferrous acid
2o
3count 5%, acidity counts 15% with sulfuric acid) mixing input pretreatment reaction still, be warming up to 45 ~ 65 DEG C, stirring reaction 1h, after press filtration, obtain 100kg and react liquid material one.
By 260kg green vitriol, (iron level is with Fe
2o
3count 20%), (iron level is with Fe for 230kg sulfuric acid type ferrous acid
2o
3count 4%, acidity counts 12% with sulfuric acid) and 10kg water input pretreatment reaction still, stir 0.5h under normal temperature, obtain 500kg and react liquid material two.
Put in airtight acidproof resistance to compression reactor by reaction liquid material one and reaction liquid material two, ON cycle pump, add the sodium nitrite solution (containing 2% sodium iodide) that 7.5kg mass concentration is 25%, pass into oxygen, oxygen flow is 0.4m
3/ h, is warming up to 55 ~ 90 DEG C, and reaction 1.5 ~ 2h, cools to obtain improved PFS solution 600kg.
Embodiment 3
By 84kg polyaluminium waste slag of aluminum, (aluminium content is with Al
2o
3count 9%, silicone content is with SiO
2count 4%), (iron level is with Fe for 126kg sulfuric acid type ferrous acid
2o
3count 8.4%, acidity counts 24.4% with sulfuric acid) mixing input pretreatment reaction still, be warming up to 45 ~ 65 DEG C, stirring reaction 1h, press filtration, obtain 140kg and react liquid material one.
By 350kg green vitriol, (iron level is with Fe
2o
3count 28.6%), (iron level is with Fe for 190kg sulfuric acid type ferrous acid
2o
3count 8.4%, acidity counts 24.4% with sulfuric acid) and 160kg water input pretreatment reaction still, stir 0.5h under normal temperature, obtain 700kg and react liquid material two.
Put in airtight acidproof resistance to compression reactor by reaction liquid material one and reaction liquid material two, ON cycle pump, add the sodium nitrite solution (containing 2% sodium iodide) that 10.5kg mass concentration is 25%, pass into oxygen, oxygen flow is 0.56m
3/ h, is warming up to 55 ~ 90 DEG C, and reaction 1.5 ~ 2h, cools to obtain improved PFS solution 840kg.
The energy saving and environment friendly improved PFS effect evaluation method of the present invention:
Sewage source is certain printing and dyeing mill Yuan Shui, and COD of sewage is 306.9mg/L, by modification PFS and PFS by 1 ‰ dosage add in sewage, regulate pH to 7, stir after coagulation and leave standstill 120min, observe supernatant liquor colourity, detect supernatant C OD index.The content parameter of testing modification PFS with PFS used is similar, and iron level is with Fe
2o
3count 11.3%, basicity is 14%.COD of sewage and clearance effect are in table 1.
Table 1 modification PFS and PFS contrasts certain disposal effect of dyeing wastewater
| COD(mg/L) | COD clearance (%) | |
| Former water | 306.9 | - |
| Modification PFS | 106.5 | 65.3 |
| PFS | 183.3 | 40.3 |
From table, data can obtain, and when dosage is identical, the COD removal effect of modification PFS is more excellent.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to right.
Claims (10)
1. a preparation technology for energy saving and environment friendly improved PFS, is characterized in that: comprise the following steps:
(1) polyaluminium waste slag of aluminum and sulfuric acid type ferrous acid are dropped into pretreatment reaction still, be warming up to 45 ~ 65 DEG C, stirring reaction 0.5 ~ 1h, press filtration, liquid material one must be reacted;
(2) green vitriol and sulfuric acid type ferrous acid are dropped into pretreatment reaction still, stir 0.5 ~ 1h under normal temperature, liquid material two must be reacted;
(3) drop in airtight acidproof resistance to compression reactor by reaction liquid material one and reaction liquid material two, ON cycle pump, adds catalyst solution and promotor solution, pass into oxygen, be warming up to 55 ~ 90 DEG C, reaction 1.5 ~ 2h, cools to obtain improved PFS solution.
2. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, it is characterized in that: in described step (1), polyaluminium chloride residue is produce the semi-solid material of polymerize aluminum chloride finished product bottom residues after press filtration, polyaluminium chloride residue contains polymerize aluminum chloride and a small amount of silicon, and its aluminium content is with Al
2o
3count 7 ~ 12%, silicone content is with SiO
2count 3 ~ 7%.
3. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: in described step (1), the mass ratio of polyaluminium chloride residue and sulfuric acid type ferrous acid is 1:1.5.
4. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: the sulfuric acid type ferrous acid in described step (1) and step (2), its iron level is with Fe
2o
3count 1 ~ 18%, acidity counts 4 ~ 25% with sulfuric acid.
5. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: in described step (2), the iron level of green vitriol is with Fe
2o
3count 18 ~ 30%.
6. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: in described step (2), the iron level of reaction liquid material two is with Fe
2o
3count 12 ~ 18%, basicity is 50 ~ 70%.
7. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: in described step (3), the mass ratio that adds of reaction liquid material one and reaction liquid material two is 1:5.
8. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: the catalyzer in described step (3) is Sodium Nitrite, and promotor is sodium iodide.
9. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 8, it is characterized in that: in described step (3), Sodium Nitrite and sodium iodide are made into the mixed aqueous solution of mass concentration difference 25% and 2% by catalyzer and promotor in use, dosage is 1.5 ~ 2% of reaction liquid material two quality.
10. the preparation technology of a kind of energy saving and environment friendly improved PFS according to claim 1, is characterized in that: in described step (3), oxygen intake is excessive, 1.65 ~ 3.3 ‰ of preferred reaction liquid material total mass.
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Cited By (3)
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|---|---|---|---|---|
| CN106241843A (en) * | 2016-07-19 | 2016-12-21 | 武汉理工大学 | A kind of method that aluminium hydroxide is prepared in polyaluminium waste slag of aluminum acid system recovery |
| CN109081382A (en) * | 2018-10-25 | 2018-12-25 | 马鞍山健鼎化工有限公司 | A kind of processing technology of bodied ferric sulfate |
| CN111453826A (en) * | 2020-04-03 | 2020-07-28 | 中国科学院合肥物质科学研究院 | Micro-nano porous polyaluminium coagulant aid and preparation method and application thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106241843A (en) * | 2016-07-19 | 2016-12-21 | 武汉理工大学 | A kind of method that aluminium hydroxide is prepared in polyaluminium waste slag of aluminum acid system recovery |
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| CN111453826A (en) * | 2020-04-03 | 2020-07-28 | 中国科学院合肥物质科学研究院 | Micro-nano porous polyaluminium coagulant aid and preparation method and application thereof |
| CN111453826B (en) * | 2020-04-03 | 2022-02-08 | 中国科学院合肥物质科学研究院 | Micro-nano porous polyaluminium coagulant aid and preparation method and application thereof |
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