CN1053645C - Method for production of iron oxide from ferrous chloride solution - Google Patents
Method for production of iron oxide from ferrous chloride solution Download PDFInfo
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- CN1053645C CN1053645C CN94108555A CN94108555A CN1053645C CN 1053645 C CN1053645 C CN 1053645C CN 94108555 A CN94108555 A CN 94108555A CN 94108555 A CN94108555 A CN 94108555A CN 1053645 C CN1053645 C CN 1053645C
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Abstract
The present invention relates to a method for preparing iron oxide red and iron oxide yellow from the aqueous solution of ferrous chloride by using the air as an oxidizing agent and calcium oxide as a neutralizing agent. Crystal seeds used for manufacturing iron oxide red are prepared by the reaction of the aqueous solution of iron trichloride and the calcium oxide. The manufacturing process of iron oxide yellow is carried out under the normal temperature; the air which is used as the oxidizing agent is pumped by an impeller body of a mechanical agitation flotation machine and is highly dispersed in the aqueous solution, wherein the impeller body of the mechanical agitation flotation machine is used as a stirrer. The present invention is used for processing industrial waste materials comprising ferrous salt, such as chlorohydric acid pickling waste liquid of steel, waste liquid generated in the production of artificial rutiles by a hydrochloric acid method, etc. The present invention has the advantages of high processing speed, low energy consumption, simple equipment and low operation cost.
Description
The invention relates to make in the aqueous solution ferrous ion oxidation and in alkaline matter and deposit be a kind of method of iron oxide product.This method is commonly referred to as the oxidation neutralisation.
When the oxide skin of the rolled products of iron and steel or mechanical workout product being removed, there are a large amount of sulfuric acid pickling waste liquids or hydrochloric acid pickling waste liquor to produce with sulfuric acid or hydrochloric acid.Produce in the process of artificial rutile at the salt acid system, produce a large amount of ferrous chloride waste fluids.During the Production By Sulfuric Acid Process titanium white, also produce a large amount of ferrous sulfate.It is well-known handling these ferrous salt waste materials with the oxidation neutralisation.
Handle perferrite solution with the oxidation neutralisation, generally be divided into dual mode.A kind of mode is to charge into air and keeping under the certain temperature, when pressing certain speed add ferrous salt solution in the oxidation neutralizing well, controlledly adds the alkaline matter as neutralizing agent.For example, handle " the red ammonium method " of sulfuric acid pickling waste liquid and production red iron oxide and ammonium sulfate.(Metallurgical Research Institute, Department of Architecture Institute for Environmental Research compiles, the metallurgical environmental protection information documents.Waste acid treatment technology, 1983, № .2) another kind of mode is to charge into air and keeping under the certain temperature, adds alkaline matter as neutralizing agent to being contained in ferrous salt solution in the oxidation neutralizing well.The disclosed a kind of method of handling sulfuric acid pickling waste liquid of Chinese patent CN1056668A just is to use this mode.
Use the prior art of above-mentioned oxidation neutralisation dual mode, the air that charges into solution is just being followed the solution that is stirred at the most and is being broken up into tiny inadequately bubble.So, have only portion of air seldom to play effect, most of air is very fast has run away from solution.The air utilization ratio of " red ammonium method " has only about 1% usually less than 3%, is this reason.Ferrous ion in the aqueous solution is the molecular oxygen institute oxidation that is dissolved in the air in the water.Therefore, the molecular oxygen of air meltage in solution in the unit time has determined the oxidized speed of ferrous ion in the solution, has promptly determined to handle the speed of ferrous salt waste liquid.The speed of prior art processing degree liquid such as " red ammonium methods " is very low.Iron amount in the waste liquid of handling in the unit time with the unit useful volume of equipment is represented processing speed, " red ammonium method " just 0.045 kilogram at the most, iron/decimetre
3The lower velocity that ferrous ion is oxidized means that the ferric oxide particles that conforms with specification of quality becomes to look very slow.So the long processing period of " red ammonium method " reaches 100 hours.The amount of charging into that increases air can make the dissolved molecular oxygen more; In oxidation neutralizing well inwall installing baffle plate and high degree of agitation, it is better that air dispersion is got, so the speed that disposes waste liquid can increase, the processing cycle can shorten to some extent.But this has not only increased the energy expenditure of inflation itself, and has increased the energy expenditure of water evaporation.With right, the complicated of device makes troubles not only for design and construction, also increased initial cost.As the open CN1052098A of Chinese patent application.
When making red iron oxide, need preparation crystal seed earlier toward contact with the oxidation neutralisation.Before Deutsches Wirtschafts Patent Ger (East) 57054 and 61582, used crystal seed when making the iron filings corrosion that is immersed in the hot water be red iron oxide with air reacts with ammoniacal liquor or sodium hydroxide or aqueous sodium carbonate and ferric chloride aqueous solutions and to prepare.
In the prior art of oxidation neutralisation dual mode, the overwhelming majority is to make neutralizing agent with ammonia.In making the prior art of crystal seed, nearly all be as neutralizing agent with ammoniacal liquor or sodium hydroxide or aqueous sodium carbonate.Though ammonia is inexpensive, the ammonia consumption is handled in the total cost of ferrous salt waste liquid with the production iron oxide pigment in the oxidation neutralisation and is accounted for quite great proportion.Simultaneously, because the average daily production of ferrous salt solution is big, buying, transportation and the storage of handling their required a large amount of ammonia also is problem.Obviously, replacing ammonia with more cheap solid alkaline material, is the important channel that reduces oxidation neutralisation cost and save initial cost.
One of purpose of the present invention is: employing can use air at solution camber dispersive device, so that improve air utilization ratio, increase processing speed, shorten in the oxidation and cycle and cutting down the consumption of energy.Another object of the present invention is: make neutralizing agent with lime, so that produce qualified iron oxide product by ferrous chloride waste fluid at low cost.A further object of the invention is also prepared the high-quality crystal seed of being convenient to production scheduling with lime as neutralizing agent.
Crystal seed preparation method of the present invention is: in room temperature with under stirring, add lime in ferric chloride aqueous solutions.Along with the adding of lime, the pH value of reaction mixture rises; PH2.50 is the terminal point of seed crystal production process.The content of liquor ferri trichloridi is every liter 1 to 120 gram, about preferably restraining for every liter 30.As the lime of neutralizing agent, can be fine powder not, also can be the milk of lime that modulates, preferably milk of lime.For the equipment volume that reduces crystal seed preparation, save the post staffing and be convenient to production scheduling, preferably dilution is standby for dilute solution after the denseer seed-solution of preparation.With the water that contains little acetic acid seed-solution is diluted to every liter of iron content 2-5 gram, can obtains the long-term transparent and seed-solution of loss of activity not of reddish-brown.Acetic acid content in rare seed-solution can be every liter 0 and arrive about 0.8 gram that preferably every liter about 0.4 restrains.
The crystal seed that the present invention makes, not only can be used on and similarly make in the technology of iron oxide product by perferrite solution with the oxidation neutralisation with partial content of the present invention, also can be used on traditional wet method of air corrosion iron filings and make in the production of iron oxide pigment, can also be used in the process of hydrochloric acid manufactured artificial rutile.Owing to the crystal seed that the present invention makes, be actually the colloidal solution of ferric oxide, so crystal seed manufacture method of the present invention also can be used as an operation making the nanometer ferro oxide particulate.
In order to make iron oxide red by containing chlorination ferrous waste liquid, the present invention adopts first kind of mode of aforementioned oxidation neutralisation: under stirring, inflation and 80-90 ℃ condition, in the water that contains small amount of seeds and acetic acid, (be called end liquid here), controlledly add ferrous chloride aqueous solution, and by adding the way of lime, the pH that keeps reaction mixture is 4-5, until the color of product and the solid colour of standard oxidation iron oxide red.Crystal seed in the end liquid is by aforementioned method of the present invention, is made by iron trichloride and lime reaction.The concentration of crystal seed in the end liquid by iron, is the 0.3-20 grams per liter.0.7-0.8 grams per liter preferably.The concentration of acetic acid is the 0-1 grams per liter in the end liquid, preferably the 0.5-0.8 grams per liter.As the ferrous chloride aqueous solution of raw material, can be the hydrochloric acid pickling waste liquor of iron and steel, also can be the waste liquid that the salt acid system is produced the artificial rutile output.Usually the free residual acid that contains in these waste liquids, the most handy waste iron filing is with the content of ferrous ion in its displacement and the increase solution.The device of stirred solution is the impeller body of subaeration flotation machine.As the air of oxygenant sucked by impeller body and high dispersing in solution.As the lime of neutralizing agent, can be the powder of porphyrize, also can be the synthetic suspension liquid of water, promptly common alleged milk of lime.The color of the iron oxide red product that obtains is more bright-coloured, redder than standard, and relative color strength is also higher.
In order to make iron oxide yellow by solution of ferrous chloride, the present invention adopts the second way of aforementioned oxidation neutralisation: under stirring, inflation and normal temperature condition, in the iron protoxide aqueous solution, add an amount of lime, make the pH of solution rise to 5-6, make solution change into blackish green simultaneously by as clear as crystal light green.After stopping to add lime,, make the pH of solution rise to 5-6 again, perhaps make the color of reaction mixture, change into blackish green again when the pH of reaction mixture reduces to 3-4 and when the color of reaction mixture presents yellow, adds an amount of lime again.So, add lime in batches according to the colour-change of reaction mixture and/or the variation of pH.After adding a small amount of lime, pH promptly rises, but the color of reaction mixture be can't help yellow and changed into blackish green.Ferrous chloride aqueous solution as raw material, it can be the hydrochloric acid pickling waste liquor of iron and steel, also can be that the waste liquid of hydrochloric acid method artificial rutile output or other contain chlorination ferrous solution, usually the residual acid that contains in these waste liquids and a small amount of ferric ion, the most handy waste iron filing is with residual acid displacement and make ferric ion be reduced to ferrous ion.The ferrous chloride aqueous solution of handling like this, if concentration is higher, preferably dilute with water is the 30-50 gram, iron/liter.The device of stirred solution is the impeller body of subaeration flotation machine.As the air of oxygenant sucked by impeller body and high dispersing in solution, as the lime of neutralizing agent, can be the powder of porphyrize, also can be the synthetic suspension liquid of water, i.e. alleged milk of lime usually.Add the beginning of lime each time and stop, can be only according to the reaction mixture change in color, also can be only according to the variation of reaction mixture pH, preferably simultaneously according to the two variation; Especially in reaction during, preferably according to the variation of reaction mixture pH near terminal point.
For the big again iron protochloride industrial effluent of speed of response height, quantum of output, the processing speed of oxidation neutralisation is crucial technico-economical comparison in practice.When making red iron oxide and iron oxide yellow with method of the present invention, the speed of handling ferrous chloride aqueous solution can reach 24 kilograms, iron/hour rice
3, this is 10 times of " red ammonium method " processing speed; Than a kind of continuous processing (6-12 kilogram, iron/hour rice of attempting to improve processing speed
3, CN1052098A) also high.With the cycle that method of the present invention is made iron oxide red and iron oxide yellow, be respectively 3-5 hour and 2-3 hour, this is than " red ammonium method " (100 hours) much shorter.
Contain the ferrous salt industrial effluent with the processing of oxidation neutralisation, for existing technology, energy expenditure is occupied quite great proportion in total cost.The following fact illustrates that technology of the present invention has significantly reduced energy expenditure: do not need to oxidation neutralizing well make up water in high processing speed and the whole process when making iron oxide red, promptly the evaporation of water amount is little; High processing speed and operation at normal temperatures when making iron oxide yellow; Air utilization ratio can reach 10% even 12%; As the device that stirs is again the device of suction and dispersion air.
The present invention makes neutralizing agent with lime the most inexpensive this alkaline matter, and also more existing technology has reduced cost significantly.
The crystal seed quality is made in the iron oxide product in wet method crucial meaning.The iron oxide red that the present invention makes bright-colored, relative color strength is high and processing speed is high, outside the Pass must having well with air dispersion, illustrates that also the present invention is with the crystal seed quality height of iron trichloride with the lime reaction manufacturing.
The present invention makes the method for iron oxide yellow, not only at room temperature carries out but also can more extensive ground portion-wise addition lime, therefore operates simple and easy.
The present invention is the impeller body that mineral sort industrial general subaeration flotation machine with mixing, charge into device with dispersion air.Have on the market all size (little to 0.5 liter greatly to 30 meters
3) the standardized product supply.So there is not the problem of groping amplification rule in the equipment that the present invention is used.This just provides convenience for design, construction construction, also saves initial cost.
Following examples have specifically been set forth the present invention, but are not limitation of the present invention.
Embodiment 1
In glass beaker, fill concentration of iron and be 100 milliliters of the ferric chloride aqueous solutionses of 28 grams per liters, room temperature and stirring down splashes into 10% milk of lime.Along with splashing into of milk of lime, the pH value is by 0.98 rising gradually of adding liquor ferri trichloridi before the lime.During to pH2.50, stop to splash into lime.Obtain 145 milliliters of slightly turbid red tan solutions.According to, with the water that contains little acetic acid it is diluted to iron content 2.8 grams per liters, contain the solution of acetic acid 0.5 grams per liter.About 1 hour of whole process.The seed-solution that makes so also is that reddish-brown is as clear as crystal even at room temperature place tens of days always.
Embodiment 2
In glass beaker, fill by 1 liter of the crystal seed of iron trichloride and ammoniacal liquor prepared in reaction and the acetic acid blended aqueous solution.Contain crystal seed (connecing the iron meter) and acetic acid in this liquid and be 0.8 grams per liter.The impeller body of subaeration flotation machine that with the diameter of impeller is 45 millimeters is as agitator.Air air suction pipe through impeller from ambient atmosphere is inhaled into and is dispersed in the solution, stirring and holding temperature is under 85 ℃ the condition, with 0.22 gram, the flow of iron/decilitre, silicon steel hydrochloric acid pickling waste liquor (concentration of iron 98.4 grams per liters that in beaker, splashed into iron powder replacement residual acid and filtered, pH is about 1), and keep the pH of reaction mixture between 4-5 with the milk of lime that splashes into 8%.So carried out 270 minutes.The iron oxide red that obtains meets wet method iron oxide red mixed acid process HO
01-04The index of standard code, but color is redder and bright-coloured than standard.
Embodiment 3
Except crystal seed by embodiment 1 by ferric chloride aqueous solutions and milk of lime prepared in reaction, and feed liquid is filtrate (concentration of iron 114 grams per liters of straight carbon steel cold-reduced sheet hydrochloric acid pickling waste liquor after the residual acid of lathe iron powder replacement, pH about 0.5) and with 0.26 gram, iron/rise outside the speed charging of branch, other condition is with embodiment 2.Process has been carried out 150 minutes.
Embodiment 4
In glass beaker, fill 700 milliliters of solution of ferrous chloride, it is to be come with the water dilution by embodiment 3 used feed liquids.Its concentration of iron is 32.6 grams per liters.pH～1。The device of stirring, suction and dispersion air is with embodiment 2, stir and room temperature under, in beaker, add about 5 milliliters of 10% milk of lime in 2 minutes, reaction mixture is the blackish green deeply of muddiness, pH is bordering on 6.Stir after 25 minutes, the color of reaction mixture transfers khaki color to, and pH is bordering on 4.Continuing under the stirring, about 2 milliliters of the milk of lime of adding 10% in 2 minutes, slurry transfers to again blackish green (pH～5).Disposed slurry transferred khaki color (pH3-4) in 20 minutes.Add 4 milliliters of milk of limes again.So look paste color and pH variation and add milk of lime in batches, all be converted into iron oxide yellow until ferrous ion.Process has been carried out 160 minutes.
Claims (4)
1, a kind of method of making red iron oxide and iron oxide yellow.It is to use air oxidant, under alkaline matter neutral condition, change the ferrous ion in the ferrous chloride aqueous solution into red iron oxide and iron oxide yellow, when making red iron oxide, be temperature be 80-90 ℃ and stir, under the condition of inflation, in the aqueous solution that contains crystal seed and acetic acid, add ferrous chloride aqueous solution with certain flow, simultaneously, controlledly add alkaline matter, it is characterized in that: as the air of oxygenant sucked by the impeller body of subaeration flotation machine and high dispersing in solution; Alkaline matter as neutralizing agent is a lime, and, when making red iron oxide, be that the pH that keeps reaction mixture with adding lime is 4-5; When making iron oxide yellow, be under the condition of normal temperature and stirring, inflation, in ferrous chloride aqueous solution, add pH and/or color that lime is controlled reaction mixture in batches.
2, described in the claim 1 when making iron oxide yellow, in ferrous chloride aqueous solution, add lime in batches, it is characterized in that: each batch adds the beginning of lime, is that pH according to reaction mixture is that 3-4 and/or reaction mixture are for yellow; Each batch adds stopping of lime, is that the pH according to reaction mixture is that 5-6 and/or reaction mixture are blackish green.
3, the crystal seed described in the claim 1 is the colloid aqueous solution of ferric oxide, it is characterized in that: it adds lime in ferric chloride aqueous solutions manufactured.
4, add lime described in the claim 3 in ferric chloride aqueous solutions, it is characterized in that: the terminal point of this process is that the pH value of reaction mixture is 2.50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94108555A CN1053645C (en) | 1994-08-05 | 1994-08-05 | Method for production of iron oxide from ferrous chloride solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94108555A CN1053645C (en) | 1994-08-05 | 1994-08-05 | Method for production of iron oxide from ferrous chloride solution |
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| CN1104182A CN1104182A (en) | 1995-06-28 |
| CN1053645C true CN1053645C (en) | 2000-06-21 |
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| CN94108555A Expired - Fee Related CN1053645C (en) | 1994-08-05 | 1994-08-05 | Method for production of iron oxide from ferrous chloride solution |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050344C (en) * | 1996-10-24 | 2000-03-15 | 冶金工业部长沙矿冶研究院 | Method and device for continuously producing high-purity iron oxide |
| DE19652953C2 (en) * | 1996-12-19 | 2000-05-18 | Bayer Ag | Process for the production of iron oxide nuclei and their use |
| CN100430521C (en) * | 2006-04-28 | 2008-11-05 | 中冶南方工程技术有限公司 | Purification treatment process of waste liquor of hydrochloric acid |
| CN101844815A (en) * | 2010-05-31 | 2010-09-29 | 广西平桂飞碟股份有限公司 | Method for producing iron oxide red pigments by using calcium mineral salt as neutralizer for two-step oxidation |
| CN102689930B (en) * | 2011-03-24 | 2014-07-30 | 镇江市丹徒区江南热镀锌有限公司 | Hydrochloric acid pickling waste liquid resource integrated utilization method for preparing iron oxide and ammonium sulfate |
| AT512384A1 (en) * | 2011-12-16 | 2013-07-15 | Sms Siemag Process Technologies Gmbh | Process for the concentration and separation of metal chlorides in / from an iron (III) chloride-containing hydrochloric acid solution |
| CN103539201A (en) * | 2013-01-23 | 2014-01-29 | 自贡市亚钛化工科技有限公司 | Hydrochloric-acid-method titanium yellow powder production technology |
| CN104261485B (en) * | 2014-10-09 | 2015-12-30 | 中国有色集团（广西）平桂飞碟股份有限公司 | A kind of calcium mineral salt Wet reaction solution treatment process |
| CN104451688B (en) * | 2014-12-12 | 2017-06-27 | 嘉兴学院 | A kind of method of electrolytic regeneration Ni from waste etching FeCl 3 solution containing co-production iron oxide yellow |
| CN110756144A (en) * | 2019-10-31 | 2020-02-07 | 唐山达润达危废处理有限公司 | Production device and method of ferric trichloride |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105994A (en) * | 1985-08-03 | 1987-01-28 | 冶金工业部长沙矿冶研究院 | Process for preparing iron oxide red and other products from waste liquid containing iron |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105994A (en) * | 1985-08-03 | 1987-01-28 | 冶金工业部长沙矿冶研究院 | Process for preparing iron oxide red and other products from waste liquid containing iron |
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