CN109987637A - A method of iron oxide yellow is prepared using red soil - Google Patents
A method of iron oxide yellow is prepared using red soil Download PDFInfo
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Abstract
The present invention provides a kind of methods for preparing iron oxide yellow using red soil, this method comprises the following steps: 1) preparing solution of ferrous chloride using red soil: dissolving with hydrochloric acid being added in red soil, filter to take filtrate, and iron filings and/steel scrap are added into filtrate, the secondary filtrate obtained after secondary filter is solution of ferrous chloride；2) prepared by crystal seed: the solution of ferrous chloride of the step 1) preparation adds ammonium hydroxide and stirs, then blowing air/oxygen into solution, thereto until solution PH is down to 4~5；3) second oxidation: being added the solution of ferrous chloride of step 1) preparation in the crystal seed that the step 2) obtains, and with air/oxygen is passed through, ammonium hydroxide is added and stirs, is oxidized by oxygen ferrous ion for iron oxide yellow；4) prepare iron oxide yellow: the solution that the step 3) is obtained filters, iron oxide yellow filter cake is washed, it is dry, grind after obtain iron oxide yellow powder.This method reduces production cost, solves red soil pollution problem, has a good application prospect.
Description
Technical field
The present invention relates to iron oxide yellow production technical fields, more particularly, to a kind of method for preparing iron oxide yellow using red soil.
Background technique
It is zinc-plated acted in terms of the anti-corrosion of steel and energy saving resource it is huge.Hot galvanizing be in the world it is most widely used,
Steel surface processing method, and zinc-plated operating process can generate a large amount of waste water, there are many technique for handling this waste water, but at present
Waste water recycles after processing mostly, uses industrial lye for neutralizer and precipitating reagent, waste water is squeezed into treatment tank,
It is continuously added to liquid alkaline and is aerated for a long time, zinc chloride and iron chloride and a part of residue are become precipitating, through filters pressing, clear water can be again
Secondary utilization, sediment become red soil, 4100 tons of -4200 tons of about 20-25 tons of galvanizing production output red soil of every production, therefore annual plating
The red soil of zinc Industrial Output has millions of tons, exerts heavy pressures on to environment.And iron ion also rich in red soil, if not
Processing is carried out to red soil and on the one hand causes environmental pollution, on the other hand will cause the waste of resource.
Iron oxide yellow is a kind of iron oxide pigment with economic value.In the coloring of paint, leather, rubber, optical glass etc.
Aspect, Tie Douyou are widely applied very much；It also can be used for telecommunication, measurement instrument industry and magnetic material, polish, catalyst pigment
Deng.
Traditional iron oxide yellow production technology generally uses wet process oxide sulfate method: preparing iron oxide seed crystal first, then iron oxide yellow
Crystal seed and iron sheet and air carry out the synthesis of iron oxide yellow in ferrous sulfate medium.Ferrous iron is aoxidized by the oxygen in air, generates three
Valence iron, and be deposited on crystal seed, while sulfuric acid is precipitated, sulfuric acid is reacted with the iron sheet again with addition, generates ferrous sulfate.By this
Sample constantly aoxidizes, and required iron oxide yellow is gradually formed in liquid.Ferrous sulfate needed for this method requirement prepares iron oxide seed crystal is molten
Liquid degree of purity is higher, is not able to satisfy using the ferrous sulfate solution of titanium white by product ferrous sulfate purification preparation directly and prepares iron oxide yellow
Requirement, gained iron oxide yellow pigments inferior quality.Therefore it is generally used sulfuric acid in actual production and reacts that prepare sulfuric acid sub- with iron sheet
Ferrous solution, then it prepares iron oxide seed crystal and then produces iron oxide yellow with these solution, therefore production cost is relatively high.
Summary of the invention
In view of this, the present invention is directed to propose it is a kind of reduce production cost, turn waste into wealth prepare iron oxide yellow using red soil
Method.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A method of iron oxide yellow being prepared using red soil, this method comprises the following steps:
1) solution of ferrous chloride is prepared using red soil:
Dissolving with hydrochloric acid is added in red soil, then dissolved solution is filtered with filter, takes filtrate, and to filter
Iron filings and/steel scrap are added in liquid, the iron ion of trivalent in filtrate are reduced into the ferrous ion of divalent, then with filter to filtrate
Secondary filter is carried out, obtained secondary filtrate is solution of ferrous chloride, spare；
Wherein, the acid waste water that the red soil in hot dip Zn Cr coating generates in pickling and rinse cycle, pickling waste waters
Zinc chloride, frerrous chloride and a small amount of hydrochloric acid etc. are mainly contained, pH value uses industrial lye for neutralizer and precipitating between 2~3
Agent squeezes into waste water in treatment tank, is neutralized using continuous liquid alkaline addition method.Since the iron in waste water is mainly with ferrous iron
Ionic species exists, the Fe (OH) generated after neutralization2Solubility in water is higher, is not easy to precipitate, so when in neutralization pond
Using long-time aeration, ferric ion is converted by ferrous ion, and then generates and can be precipitated in lower pH value
Fe(OH)3.By sedimentation separation, clear water is discharged, this clear water can utilize again, and zinc chloride and iron chloride and a part of residue
Become precipitating for after filters pressing, sediment fraction becomes red soil to be processed herein.
After the dissolution of red soil this part terminates, most Fe (OH) in red soil3It is dissolved, becomes Fe3+Into
Solution, but the red soil and other residues for still thering is fraction not dissolve thoroughly.Since these residues can be to next anti-
It should have adverse effect on, the red soil not dissolved also is not fully used, and therefore, at this moment needs to be filtered operation.
Filtering uses chamber-type press filter, and dehydration efficiency is high, and the rate of filtration is fast, and slag dumping is convenient, automatic pulling plate unloading easy to accomplish, operation
Intensity it is also little.
After filter process, the obtained iron in filtrate mainly exists in the form of ferric ion, in order to carry out down
The processing of one step needs for the iron ion of trivalent to be reduced into the ferrous ion of diformazan because hot galvanizing factory have a large amount of iron filings and
Steel scrap, these were all originally nugatory waste materials, and in order to save production cost, enough steel scraps can be added into reactor tank
It is reacted with iron filings residue, until the color of filtrate becomes bright green.In this way, the existence form of iron is just from original in one side solution
Ferric ion conversion in order to divalent ferrous ion, red soil become produce iron oxide yellow raw material solution of ferrous chloride；It is another
Aspect, waste have also obtained effective utilization, production cost have been saved from source.
In order to guarantee the abundant progress of reduction reaction, the iron filings and steel scrap of addition be it is excessive, it is molten in addition to iron filings and steel scrap
There are also other solid insolubles of part in liquid.Therefore, it before carrying out oxidation and preparing iron oxide yellow, needs to be filtered liquid.This
In filter plant also select the rate of filtration fast, slag dumping is convenient, and filter pressure is big, and filter cake liquid content is low, the compartment of wide adaptation range
Formula filter press.
Since liquid at this time still has certain corrosivity, the storage facilities of solution of ferrous chloride selects corrosion resistant
The stainless steel storage tank of erosion selects then horizontal stainless steel storage tank to efficiently utilize space.
2) prepared by crystal seed:
The solution of ferrous chloride for taking the step 1) preparation adds ammonium hydroxide thereto and stirs, and the PH of solution is after mixing
6.5~7.5, then blowing air/oxygen into solution, until oxidation reaction stops when solution PH is down to 4~5；
Use frerrous chloride and ammonium hydroxide as raw material, reacts between them, generate precipitating, sky is passed through into solution
Gas/oxygen, ferrous ion are further oxided, and the pH value of solution also decreases.
The reaction equation of this process are as follows:
FeCl2+2NH3·H2O=Fe (OH)2↓+2NH4Cl
4Fe2++O2=4FeOOH ↓+8H+
But due to the Fe (OH) in suspension2There is a following ionization equilibrium, the pH value of solution can be 5~6
Between there are a platforms.This is because the reduction of the pH value with solution, balance can move right, the hydroxide ion of generation
Neutralization reaction occurs with hydrogen ion.Work as Fe2+The speed and Fe (OH) of oxidation2When the speed of dissolution is equal, the hydrogen ion of system is dense
Degree is not just changing, so as to cause the appearance of platform, ionization equilibrium equation are as follows:
Fe(OH)2(S)=2OH-+Fe2+。
Then, Fe (OH)2Continue to dissolve, when its dissolution close to it is complete when, dissolution-oxidation balance is just destroyed, pH value by
Platform continues to reduce, and the rate of oxidation is also with slowing down, and when pH drops to 4.5 or so, oxidation reaction stops substantially.In this phase
Between, significant change can occur for the color of solution, become deep blue from pewter, then become blackish green, and then become yellow green, finally
Become yellow.Here it is the preparation process of crystal seed.
3) second oxidation:
The solution of ferrous chloride of step 1) preparation is added in the crystal seed that the step 2) obtains, it is same to be passed through air/oxygen,
Ammonium hydroxide is added and stirs, adjusting PH is 4~5, is oxidized by oxygen ferrous ion for iron oxide yellow；
In second oxidation, need to be continuously added frerrous chloride crystalline mother solution and NH3H2O solution into reactor,
Ferrous ion is oxidized by oxygen for FeOOH, at the same time, also with ammonium hydroxide neutralization reaction occurs for the hydrochloric acid of precipitation, generates
NH4Cl.In this way, the ferrous ion being added constantly is oxidized by oxygen as iron oxide yellow pigments.This process equation formula are as follows:
2FeCl2+O2+2H2O=2FeOOH ↓+4HCl
HCl+NH3H2O=NH4Cl+H2O。
Wherein, the pH value of solution not only will affect the formation of crystal seed in seed crystal production process, during second oxidation,
The pH variation of solution equally can generate extreme influence to the production of iron oxide yellow.
If the pH of solution is too low, the speed of reaction is slow, and production efficiency is relatively low；It, can be because if the pH of solution is more than 6.5
To generate Fe3O4And there is apparent black precipitate.By experimental demonstration, when yellow is presented to blackish green in the color of reaction system,
PH value can quickly generate iron oxide yellow at 4~5 or so.Therefore, it is necessary to pass through control during second oxidation
Being added dropwise to control the pH value of reaction system for ammonium hydroxide, makes to react preferable progress.
4) iron oxide yellow is prepared:
The solution filtering that the step 3) is obtained, obtains iron oxide yellow filter cake and filtrate, iron oxide yellow filter cake is washed, it is dry, grind
Iron oxide yellow powder is obtained after mill.
Further, the hydrochloric acid of 56mL is added in the step 1) in every 50g red soil.
Further, the reaction temperature of the step 2) is 25 DEG C.
Further, in the step 2) every 1L solution of ferrous chloride need to be added at one time 0.050L industrial ammonia and
The water of 0.080L.
Further, the reaction temperature of the step 3) is 70~95 DEG C.
Further, the step 2) and step 3) blowing air/oxygen flow are 0.35m3/h。
Further, the mixing speed of the step 2) and step 3) is 85 revs/min.
Further, dry in the step 4) to use Rotatingandflashstreamingdrier.
Drying of the XSG Rotatingandflashstreamingdrier especially suitable for filter cake shape, cream paste, sposh pasty material is suitable for iron oxide yellow
It is dry.There are many more advantages for it: wet stock drying time in drying tower is only 5-8 seconds, and moisture content can be with flash evapn；Because dry
It is dry go out product quality and dry temperature, air quantity, there is connection between broken speed, therefore can pass through adjusting in wind speed
The wind speed and temperature that expansion drying tangent line enters, adjust the size of the finished particle of discharging, the height of whole water content；Air inlet uses
Double air ducts are tangentially entered the wind, and are guaranteed air inlet dynamic equilibrium, are avoided rotating field in the wow and flutter of radial flow fields, avoid accumulating
Material.On the other hand, because thinking that iron oxide yellow to be prepared is a kind of temperature-sensitive material, if misoperation or drying in treatment process
Temperature is excessively high, and the quality decline that will lead to iron oxide yellow product is even rotten, and the XSG Rotatingandflashstreamingdrier selected will not then generate
This situation.
For iron oxide yellow filter cake to be processed, after chamber-type press filter filters pressing, its water content is in 45 ﹪ or so.
Compared with the existing technology, the method for the present invention for preparing iron oxide yellow using red soil has the advantage that
The method iron oxide yellow obtained of the present invention for preparing iron oxide yellow using red soil, it is product purity, attached in economic aspect
The iron oxide yellow of value added height, production is uniformly bright-coloured, and tinting strength, tinting power is high, the high-end production such as can be used for making paints and painting
Product；Raw material sources are extensive, price is low；It only needs that ammonium hydroxide is added in production process, adjusts the pH of Synthesis liquid, be in addition to this not required to
Add other medicament；The ammonium chloride of output is one of zinc-plated industry raw material, can directly use for this enterprise, it is raw to reduce enterprise
Cost is produced, it can also the export trade increase performance of enterprises；In environmental protection, production process temperature is low, has power savings advantages, when medium temperature aoxidizes
Temperature only has 70~95 DEG C, and maximum temperature only has 130 DEG C when drying iron oxide, does not generate any waste water, waste residue in production process,
Production technology be it is closed circuit, any waste water of outlet and waste residue, do not meet the industrial policy of China's energy-saving and emission-reduction.Therefore, this method
The pollution problem of effective solution red soil, but waste utilization is turned waste into wealth, and the iron oxide yellow of acquisition is pigment-level iron oxide yellow, has and answers well
Use prospect.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow diagram for preparing iron oxide yellow described in the embodiment of the present invention using red soil；
Fig. 2 is the flow diagram for preparing solution of ferrous chloride described in the embodiment of the present invention using red soil.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Below in conjunction with embodiment, the present invention will be described in detail.
Embodiment:
A method of iron oxide yellow being prepared using red soil, this method comprises the following steps:
1) solution of ferrous chloride is prepared using red soil:
A, red soil source:
The acid waste water that red soil generates in pickling and rinse cycle will use certain dense in hot dip galvanizing process
The acid solution of degree carries out pickling to plating piece, and after this process, the acid of acid solution is reduced, but the content of molysite increases.This stage
The key reaction of generation are as follows:
FeO+2HCI=FeCl2+H2O,
Fe2O3+ 6HCl=2FeCl3+3H2O,
Fe3O4+ 8HCl=FeCl2+2FeCl3+4H2O,
Pickling waste waters mainly contains zinc chloride, frerrous chloride and a small amount of hydrochloric acid etc., and pH value is between 2~3, using industrial liquid
Alkali is neutralizer and precipitating reagent, and liquid alkaline concentration is 32% or so, and waste water is squeezed into treatment tank, is added using continuous liquid alkaline
Method is neutralized.Since the iron in waste water mainly exists in the form of ferrous ion, the Fe (OH) generated after neutralization2In water molten
Xie Du higher is not easy to precipitate, so when in neutralization pond use long-time aeration, by ferrous ion be converted into ferric iron from
Son, and then generate the Fe (OH) that can be precipitated in lower pH value3.By sedimentation separation, clear water is discharged, this clear water can be again
Secondary utilization, and zinc chloride and iron chloride and a part of residue become precipitating for after filters pressing, sediment fraction becomes herein will
The red soil of processing.
The red soil amount generated daily is 5 tons, and red soil is stored in depth 500mm, long 4000mm, the 6000L of wide 3000mm
It is spare in red soil storage pool.
B, it dissolves:
Mass concentration is that the technical hydrochloric acid of 36 ﹪ is stored in the stainless steel storage tank of hydrochloric acid corrosion resistant, in order to reduce height,
Horizontal stainless steel storage tank, volume 15000L are selected, storage tank is supported using saddle.The length 2100mm of tank body, outer diameter
1800mm, storage tank select the Sus304 stainless steel of 4mm thickness for material production.
Hydrochloric acid is added in red soil and is dissolved.By calculating and experimental demonstration, 56mL is added in every 50g red soil
Hydrochloric acid, with maximum guarantee reaction can be sufficiently carried out, i.e., 5 tons of red soil need the hydrochloric acid into 5600L.In order to guarantee
Red soil reacts sufficiently during dissolution, and 5 tons of red soil is uniformly placed in 2 identical reactor tanks, each stainless
2.5 tons of red soil is added in steel reactor tank, and the hydrochloric acid of 2800L is added, and each reactor tank is equipped with blender, it is molten altogether
Solution 10 hours, dissolves it sufficiently.
It is the stainless steel reaction tank of 5000L, interior pot size 1800mm, insulation jacket size that reactor tank, which selects volume,
1900mm, always high 4000mm, operating voltage 380V, power of motor 15kW, mixing speed are 85 revs/min to reactor tank.
C, it filters:
After dissolution terminates, most Fe (OH) in red soil3It is dissolved, becomes Fe3+Into solution, but still there is small portion
Divide the red soil and other residues not dissolved thoroughly.Since these residues can have adverse effect on next reaction,
The red soil not dissolved also is not fully used, and therefore, at this moment needs to be filtered operation.Filtering uses van-type filters pressing
Machine, the automatic chamber-type press filter of specific choosing then are that XMZ40/800-UK type free flow can wash chamber-type press filter automatically, and dehydration efficiency is high,
And the rate of filtration is fast, slag dumping is convenient, and the intensity of automatic pulling plate unloading easy to accomplish, operation is also little.
D, restore: after filter process, the obtained iron in filtrate mainly exists in the form of ferric ion, in order to
The processing for carrying out next step, needs for the iron ion of trivalent to be reduced into the ferrous ion of diformazan, because hot galvanizing factory has largely
Iron filings and steel scrap, these were all originally nugatory waste materials, in order to save production cost, can be added into reactor tank enough
Steel scrap and the reaction of iron filings residue, until the color of filtrate becomes bright green.In this way, the existence form of iron is just in one side solution
From original ferric ion conversion for the ferrous ion of divalent, the raw material frerrous chloride that red soil has become producing iron oxide yellow is molten
Liquid；On the other hand, waste has also obtained effective utilization, and production cost has been saved from source.
E, it filters:
In order to guarantee the abundant progress of reduction reaction, the iron filings and steel scrap of addition be it is excessive, it is molten in addition to iron filings and steel scrap
There are also other solid insolubles of part in liquid.Therefore, it before carrying out oxidation and preparing iron oxide yellow, needs to be filtered liquid.This
In filter plant also select the rate of filtration fast, slag dumping is convenient, and filter pressure is big, and filter cake liquid content is low, the compartment of wide adaptation range
Formula filter press.
Finally obtaining solution of ferrous chloride volume is 5000L, and the concentration of ferrous ion is 300.1g/L.
2) prepared by crystal seed:
The solution of ferrous chloride 2500L of the step 1) preparation is taken, every 1L solution of ferrous chloride needs are added at one time
The industrial ammonia of 0.050L and the water of 0.080L, the PH of solution is 7 after mixing, and and then, ferrous ion is oxidized to FeOOH crystalline substance
Kind, then blowing air/oxygen into solution, the flow of air/oxygen are 0.35m3/ h, and be stirred continuously, mixing speed 85
Rev/min, control reaction temperature is 25 DEG C, is reacted 12 hours, ferrous ion is further oxided in this course, solution
PH value also decreases.
The reaction equation of this process are as follows:
FeCl2+2NH3·H2O=Fe (OH)2↓+2NH4Cl
4Fe2++O2=4FeOOH ↓+8H+
But due to the Fe (OH) in suspension2There is a following ionization equilibrium, the pH value of solution can be 5~6
Between there are a platforms.This is because the reduction of the pH value with solution, balance can move right, the hydroxide ion of generation
Neutralization reaction occurs with hydrogen ion.Work as Fe2+The speed and Fe (OH) of oxidation2When the speed of dissolution is equal, the hydrogen ion of system is dense
Degree is not just changing, so as to cause the appearance of platform, ionization equilibrium equation are as follows:
Fe(OH)2(S)=2OH-+Fe2+。
Then, Fe (OH)2Continue to dissolve, when its dissolution close to it is complete when, dissolution-oxidation balance is just destroyed, pH value by
Platform continues to reduce, and the rate of oxidation is also with slowing down, and when pH drops to 4.5 or so, oxidation reaction stops substantially.In this phase
Between, significant change can occur for the color of solution, become deep blue from pewter, then become blackish green, and then become yellow green, finally
Become yellow.Here it is the preparation process of crystal seed.
3) second oxidation:
In second oxidation, need to be continuously added frerrous chloride crystalline mother solution and NH into reactor3·H2O solution, and
Using industrial ammonia section pH between 4~5, control reaction temperature is 80 DEG C, is reacted 48 hours, reaction process is stirred continuously, and is stirred
Mixing speed is 85 revs/min, is oxidized by oxygen ferrous ion for FeOOH, at the same time, the hydrochloric acid of precipitation also occurs with ammonium hydroxide
Neutralization reaction generates NH4Cl.In this way, the ferrous ion being added constantly is oxidized by oxygen as iron oxide yellow pigments.This process equation
Formula are as follows:
2FeCl2+O2+2H2O=2FeOOH ↓+4HCl
HCl+NH3H2O=NH4Cl+H2O。
Wherein, the pH value of solution not only will affect the formation of crystal seed in seed crystal production process, during second oxidation,
The pH variation of solution equally can generate extreme influence to the production of iron oxide yellow.
If the pH of solution is too low, the speed of reaction is slow, and production efficiency is relatively low；It, can be because if the pH of solution is more than 6.5
To generate Fe3O4And there is apparent black precipitate.By experimental demonstration, when yellow is presented to blackish green in the color of reaction system,
PH value can quickly generate iron oxide yellow at 4~5 or so.Therefore, it is necessary to during second oxidation certainly by pH
Being added dropwise to control the pH value of reaction system for dynamic control chemicals feeder control ammonium hydroxide, makes to react preferable progress.
4) iron oxide yellow is prepared:
The solution filtering that the step 3) is obtained, in order to obtain iron oxide yellow product, need that filter cake is dried and
Crushing operation finally regathers packaging iron oxide yellow product.
This integrated novel continuous drying equipment of XSG Rotatingandflashstreamingdrier is selected to carry out iron oxide yellow filter cake herein
Processing, drying of the XSG Rotatingandflashstreamingdrier especially suitable for filter cake shape, cream paste, sposh pasty material are dry suitable for iron oxide yellow
It is dry.There are many more advantages for it: wet stock drying time in drying tower is only 5-8 seconds, and moisture content can be with flash evapn；Because dry
There is connection between broken speed, therefore can pass through to adjust and dodge in product quality out and dry temperature, air quantity, wind speed
It is evaporated the wind speed and temperature that dry tangent line enters, adjusts the size of the finished particle of discharging, the height of whole water content；Air inlet is using double
Air duct is tangentially entered the wind, and is guaranteed air inlet dynamic equilibrium, is avoided rotating field in the wow and flutter of radial flow fields, avoid buildup.
On the other hand, because thinking that iron oxide yellow to be prepared is a kind of temperature-sensitive material, if misoperation or dry temperature in treatment process
Height is spent, the quality decline that will lead to iron oxide yellow product is even rotten, and the XSG Rotatingandflashstreamingdrier selected will not then generate this
Kind situation.
Iron oxide yellow powder is most obtained after drying, grinding afterwards.
By cost estimation, this method processing red soil carries out the production of iron oxide yellow, and economic effect can be brought to hot galvanizing factory
Benefit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of method for preparing iron oxide yellow using red soil, it is characterised in that: this method comprises the following steps:
1) solution of ferrous chloride is prepared using red soil:
Dissolving with hydrochloric acid is added in red soil, then dissolved solution is filtered with filter, takes filtrate, and into filtrate
Iron filings and/steel scrap are added, the iron ion of trivalent in filtrate are reduced into the ferrous ion of divalent, then carried out to filtrate with filter
Secondary filter, obtained secondary filtrate is solution of ferrous chloride, spare；
2) prepared by crystal seed:
Take the solution of ferrous chloride of the step 1) preparation, add ammonium hydroxide thereto and stir, after mixing the PH of solution be 6.5~
7.5, then blowing air/oxygen into solution, until oxidation reaction stops when solution PH is down to 4~5；
3) second oxidation:
The solution of ferrous chloride of step 1) preparation is added in the crystal seed that the step 2) obtains, with air/oxygen is passed through, is added
Ammonium hydroxide simultaneously stirs, and adjusting PH is 4~5, is oxidized by oxygen ferrous ion for iron oxide yellow；
4) iron oxide yellow is prepared:
The solution filtering that the step 3) is obtained, obtains iron oxide yellow filter cake and filtrate, iron oxide yellow filter cake is washed, it is dry, grind after
Obtain iron oxide yellow powder.
2. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: every 50g in the step 1)
The hydrochloric acid of 56mL to be added in red soil.
3. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: the reaction temperature of the step 2)
Degree is 25 DEG C.
4. the method according to claim 1-3 for preparing iron oxide yellow using red soil, it is characterised in that: the step 2)
In every 1L solution of ferrous chloride need to be added at one time the industrial ammonia of 0.050L and the water of 0.080L.
5. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: the reaction temperature of the step 3)
Degree is 70~95 DEG C.
6. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: the step 2) and step 3)
Blowing air/oxygen flow is 0.35m3/h。
7. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: the step 2) and step 3)
Mixing speed be 85 revs/min.
8. the method according to claim 1 for preparing iron oxide yellow using red soil, it is characterised in that: drying is adopted in the step 4)
Use Rotatingandflashstreamingdrier.
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| CN113387393A (en) * | 2021-06-18 | 2021-09-14 | 浙江华源颜料股份有限公司 | Clean synthesis method of low-oil-absorption iron oxide red pigment |
| CN113603148A (en) * | 2021-07-13 | 2021-11-05 | 斯瑞尔环境科技股份有限公司 | Resource utilization method for fractional precipitation separation of high-content zinc and iron waste acid |
| CN113800570A (en) * | 2021-10-30 | 2021-12-17 | 斯瑞尔环境科技股份有限公司 | Method for preparing iron oxyhydroxide by recycling ferric trichloride |
| CN115716654A (en) * | 2021-08-24 | 2023-02-28 | 斯瑞尔环境科技股份有限公司 | Resource utilization method of zinc-containing and iron-containing waste acid |
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| CN113387393A (en) * | 2021-06-18 | 2021-09-14 | 浙江华源颜料股份有限公司 | Clean synthesis method of low-oil-absorption iron oxide red pigment |
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| CN113800570A (en) * | 2021-10-30 | 2021-12-17 | 斯瑞尔环境科技股份有限公司 | Method for preparing iron oxyhydroxide by recycling ferric trichloride |
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