CN102976413B - Two-step oxidation production method for iron oxide red pigment - Google Patents
Two-step oxidation production method for iron oxide red pigment Download PDFInfo
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- CN102976413B CN102976413B CN201210422033.6A CN201210422033A CN102976413B CN 102976413 B CN102976413 B CN 102976413B CN 201210422033 A CN201210422033 A CN 201210422033A CN 102976413 B CN102976413 B CN 102976413B
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Abstract
The invention discloses a two-step oxidation production method for an iron oxide red pigment. According to the method, alpha-FeOOH is used as a seed crystal, a calcium mineral salt is used as a neutralizer in reaction process, and a byproduct obtained in preparation of titanium dioxide, i.e., ferrous sulfate, is used as a raw material; through accurate control of the reaction process, the iron oxide red pigment and a gypsum particle with different particle sizes are finally obtained, a good separation effect on the iron oxide red pigment and the gypsum particle is obtained, and the content of Fe2O3 in a final product is more than 99%; moreover, the particle size of the iron oxide red pigment is at a nanometer level and in a range of 100 to 200 nm, and granularity of the iron oxide red pigment is uniform. The method provided by the invention overcomes the problems of high production cost, secondary pollution to the environment, great potential safety hazards and the like in production of the iron oxide red pigment by using traditional methods; the byproduct ferrous sulfate obtained in preparation of titanium dioxide is utilized, and the raw material is easily available.
Description
Technical field
The present invention relates to the production method of ferric oxide red colorant, relate in particular to a kind of method of second oxidation production ferric oxide red colorant.
Background technology
Ferric oxide red colorant is very important inorganic color(ed)pigment, there is unique physicochemical property and good pigment performance, be widely used in the industry such as coating, building materials (pottery, azulejo, encaustic tile, colored cement product) plastics, its production process route is many, conventional method is taking ferrous salt as raw material at present, the liquid phase ammonia process taking industrial ammonia as oxidation neutralizing agent.But the method need to be used industrial ammonia, this has just brought the problem of three aspects:: cost is higher; In waste water, contain ammonia nitrogen, be difficult to thorough processing, form secondary pollution; Industry ammonia is the explosive hazardous chemical of poisonous and harmful, high pressure, in transport and the larger potential safety hazard of the total existence of use procedure.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of method of second oxidation production ferric oxide red colorant.It is crystal seed that the present invention adopts alpha-feooh, in reaction process taking calcium mineral salt as neutralizing agent, and adopt prepare titanium dioxide gained byproduct---ferrous sulfate is raw material, by accurate control reaction process, finally obtain with the ferric oxide red colorant of different-grain diameter and gypsum sand, and the particle diameter of ferric oxide red colorant particle of the present invention is nano level, and epigranular.Said process solved ferric oxide red colorant production cost high, to secondary environmental pollution and the problem such as potential safety hazard is large, the present invention is to preparing the byproduct of titanium dioxide gained---ferrous sulfate utilizes, and raw material is easy to get.
Technical scheme provided by the invention is:
Second oxidation is produced a method for ferric oxide red colorant, comprises the following steps:
Step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 50～60%;
Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 10～20%;
In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value is under 2.0～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 150～200kg/h, oxidization time 20h, at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 2.0～4.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 100～120kg/h, oxidization time 10h, it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min;
The mixed slurry that step 4, step 2 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 200～300 orders;
Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing;
The ferrous sulfate using in described step 2 and described step 3 obtains through centrifugation and carrying out washing treatment for the brilliant ferrous sulfate of by-product of preparing titanium dioxide gained.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, stirs all the time the solution in oxidation barrel.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value is under 2.0～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 180kg/h, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 2.0～4.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 115kg/h.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, under the condition of pH value 3.5～4.0, add continuously for the first time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 180kg/h, keeps the temperature of the solution in oxidation barrel at 60～70 DEG C, and pH value is under 3.0～3.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 115kg/h.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, and described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 10～50 μ m.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, and described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 30 μ m.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, and described screen cloth is 270 orders.
Second oxidation of the present invention is produced in the method for ferric oxide red colorant, adopt alpha-feooh as crystal seed, in reaction process taking calcium mineral salt as neutralizing agent, and adopt prepare titanium dioxide gained by-product crystalline substance---ferrous sulfate is raw material, by accurate control reaction process, finally obtain ferric oxide red colorant and gypsum particle with different-grain diameter, to the good separating effect of two kinds of particles, finally produce Fe in crystalline substance
2o
3content account for more than 99%; And the particle diameter of ferric oxide red colorant particle of the present invention is nano level, particle size range is at 100～200nm, and epigranular.Said process solved ferric oxide red colorant production cost high, to secondary environmental pollution and the problem such as potential safety hazard is large, the present invention is to preparing the by-product crystalline substance of titanium dioxide gained---ferrous sulfate utilizes, and raw material is easy to get.
Brief description of the drawings
Fig. 1 is the schema that second oxidation of the present invention is produced the method for ferric oxide red colorant.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, to make those skilled in the art can implement according to this with reference to specification sheets word.
As shown in Figure 1, the invention provides a kind of second oxidation and produce the method for ferric oxide red colorant, comprise the following steps: step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 50～60%; Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 10～20%; In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value is under 2.0～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 150～200kg/h, oxidization time 20h, at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 2.0～4.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 100～120kg/h, oxidization time 10h, it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; The mixed slurry that step 4, step 2 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 200～300 orders; Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing; The ferrous sulfate using in described step 2 and described step 3 obtains through centrifugation and carrying out washing treatment for the brilliant ferrous sulfate of by-product of preparing titanium dioxide gained.
Described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, stirs all the time the solution in oxidation barrel.
Described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value, under 2.0～4.5 condition, adds ferrous sulfate and calcium mineral salt for the first time continuously, and ferrous sulfate adds with the speed of 180kg/h, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value, under 2.0～4.5 condition, adds ferrous sulfate and calcium mineral salt for the second time continuously, and ferrous sulfate adds with the speed of 115kg/h.
Described second oxidation is produced in the method for ferric oxide red colorant, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, under the condition of pH value 3.5～4.0, add continuously for the first time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 180kg/h, keeps the temperature of the solution in oxidation barrel 60～70.DEG C, pH value, under 3.0～3.5 condition, adds ferrous sulfate and calcium mineral salt for the second time continuously, and ferrous sulfate adds with the speed of 115kg/h.
Described second oxidation is produced in the method for ferric oxide red colorant, and described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 10～50 μ m.
Described second oxidation is produced in the method for ferric oxide red colorant, and described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 30 μ m.
Described second oxidation is produced in the method for ferric oxide red colorant, and described screen cloth is 270 orders.
The present invention, by controlling reaction process, has realized the control of the particle diameter to ferric oxide red colorant particle.The consumption of the crystal seed first adding up in step 1 and step 2 can have influence on the formation speed of red iron oxide particle and the particle diameter of red iron oxide particle.In step 2, crystal seed input amount is few with respect to the crystal seed input amount in step 1, in step 2, drops into crystal seed adding after ferrous sulfate, contributes to control oxidising process in step 3.
In step 3, add at twice calcium mineral salt and ferrous sulfate, can ensure fully carrying out of oxidising process on the one hand, affect on the other hand nucleation rate, make ferric oxide red colorant particle be formed as nano level particle.In the time adding calcium mineral salt and ferrous sulfate, especially to control temperature and pH value in oxidation barrel; When temperature and pH value condition meet while requiring accordingly, just can add calcium mineral salt and ferrous sulfate.In step 3, after adding for the first time calcium mineral salt and ferrous sulfate, in initial 20min, to pass into speed lower for oxygen, improves afterwards oxygen and pass into speed, to accelerate the generation of oxidizing reaction, promotes nucleation; While adding for the second time calcium mineral salt and ferrous sulfate, select 60m
3the speed of/h passes into oxygen, to control the speed of crystal growth and the size of crystal.
Embodiment mono-
The present embodiment is prepared ferric oxide red colorant by the following method:
Second oxidation is produced a method for ferric oxide red colorant, comprises the following steps:
Step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 50%.
Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 35g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 10%; The consumption of the ferrous sulfate in step 2 is 600kg.
In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 70 DEG C, pH value is under 3.5～4.0 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 180kg/h, oxidization time 20h, at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 60 DEG C, pH value is under 3.0～3.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 115kg/h, oxidization time 10h, it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In step 3, stir all the time the solution in oxidation barrel.
The mixed slurry that step 4, step 2 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 300 orders.
Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
In the present embodiment, calcium mineral salt is that particle diameter is the Wingdale of 30 μ m.
Embodiment bis-
Second oxidation is produced a method for ferric oxide red colorant, comprises the following steps:
Step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 52%, the mass ratio of crystal seed and water is 1:7.
Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 38g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 18%; The consumption of the ferrous sulfate in step 2 is 750kg.
In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 75 DEG C, pH value is under 2.0～2.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 180kg/h, oxidization time 20h, at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 66 DEG C, pH value is under 2.8～3.4 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 115kg/h, oxidization time 10h, it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In step 3, stir all the time the solution in oxidation barrel.
The mixed slurry that step 4, step 2 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 300 orders.
Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
In the present embodiment, calcium mineral salt is that particle diameter is the rhombspar of 50 μ m.
Embodiment tri-
Second oxidation is produced a method for ferric oxide red colorant, comprises the following steps:
Step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 55%.
Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 34g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 10～20%; The consumption of the ferrous sulfate in step 2 is 800kg.
In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 69 DEG C, pH value is under 4.2～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 180kg/h, oxidization time 20h, at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 60 DEG C, pH value is under 3.3～3.8 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1:1.52, ferrous sulfate adds with the speed of 115kg/h, oxidization time 10h, it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In step 3, stir all the time the solution in oxidation barrel.
The mixed slurry that step 4, step 2 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 300 orders.
Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
In the present embodiment, calcium mineral salt is that particle diameter is the Wingdale of 20 μ m.
Below provide the performance test data of the ferric oxide red colorant of each embodiment.
| Index name | Embodiment mono- | Embodiment bis- | Embodiment tri- |
| Ferric oxide red colorant particle diameter | 100～120nm | 122～136nm | 164～181nm |
| Fe 2O 3Content | 99.3％ | 99.1％ | 99.4％ |
| Color | Dark red | Dark red | Dark red |
| Screenings (300 order) | 0.02％ | 0.04％ | 0.07％ |
| Oil number | 30.6g/100g | 29.9g/100g | 29.7g/100g |
| Water-soluble salt | 0.02％ | 0.03％ | 0.05％ |
| PH value | 5.2 | 5.0 | 5.9 |
| Water soluble sulfate (5O 4 2-) | 0.02％ | 0.09％ | 0.05％ |
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification sheets and embodiment, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend of describing.
Claims (7)
1. second oxidation is produced a method for ferric oxide red colorant, it is characterized in that, comprises the following steps:
Step 1, taking alpha-feooh as crystal seed, crystal seed and water are fed in oxidation barrel, crystal seed input amount be ferrous sulfate in subsequent step two total consumption 50～60%;
Step 2, with the pH value that a small amount of sulfuric acid is adjusted the solution in oxidation barrel be 4, and be warming up to 70～73 DEG C, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, drop into crystal seed to the solution in oxidation barrel again, crystal seed input amount be ferrous sulfate used in step 2 consumption 10～20%;
In the solution of step 3, the oxidation barrel that obtains to step 2, continuing to pass into oxygen is oxidized, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value is under 2.0～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1: 1.52, ferrous sulfate adds with the speed of 150～200kg/h, oxidization time 20h, and at initial 20min, it is 100m that oxygen passes into speed
3/ h, at initial 20min, to oxidization time 20h, it is 150m that oxygen passes into speed
3/ h, stop adding ferrous sulfate and calcium mineral salt to oxidization time 20h, pass into continuously after oxygen 10min, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 2.0～4.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, the mass ratio of the add-on of calcium mineral salt and ferrous sulfate is CaCO
3: FeSO
4=1: 1.52, ferrous sulfate adds with the speed of 100～120kg/h, oxidization time 10h, and it is 60m that oxygen passes into speed
3/ h, stops adding ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min;
The mixed slurry that step 4, step 3 obtain is isolated red iron oxide slurry and gypsum by screen cloth, and the order number of screen cloth is 200～300 orders;
Step 5, by isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing;
The ferrous sulfate using in described step 2 and described step 3 obtains through centrifugation and carrying out washing treatment for the byproduct ferrous sulfate of preparing titanium dioxide gained.
2. second oxidation as claimed in claim 1 is produced the method for ferric oxide red colorant, it is characterized in that, in described step 3, stirs all the time the solution in oxidation barrel.
3. second oxidation as claimed in claim 1 is produced the method for ferric oxide red colorant, it is characterized in that, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, pH value is under 2.0～4.5 condition, add continuously for the first time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 180kg/h, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 2.0～4.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 115kg/h.
4. second oxidation as claimed in claim 3 is produced the method for ferric oxide red colorant, it is characterized in that, in described step 3, keep the temperature of the solution in oxidation barrel at 68～75 DEG C, under the condition of pH value 3.5～4.0, add continuously for the first time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 180kg/h, keep the temperature of the solution in oxidation barrel at 60～70 DEG C, pH value is under 3.0～3.5 condition, add continuously for the second time ferrous sulfate and calcium mineral salt, ferrous sulfate adds with the speed of 115kg/h.
5. second oxidation as claimed in claim 1 is produced the method for ferric oxide red colorant, it is characterized in that, described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 10～50 μ m.
6. second oxidation as claimed in claim 5 is produced the method for ferric oxide red colorant, it is characterized in that, described calcium mineral salt is that particle diameter is Wingdale or the rhombspar of 30 μ m.
7. second oxidation as claimed in claim 6 is produced the method for ferric oxide red colorant, it is characterized in that, described screen cloth is 270 orders.
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| WO2016034694A1 (en) * | 2014-09-05 | 2016-03-10 | Lanxess Deutschland Gmbh | Preparation of iron (iii) oxide pigments |
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| 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 |
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| US6530987B1 (en) * | 1998-03-20 | 2003-03-11 | Bayer Aktiengesellschaft | Method for producing iron oxide pigments from waste acid resulting from TiO2 production |
| CN1415665A (en) * | 2002-12-04 | 2003-05-07 | 中国化工建设总公司常州涂料化工研究院 | Method for producing the red pigment of ferric oxide from ferrous sulphate of byproduct abolished by titanium white |
| CN1699224A (en) * | 2005-06-29 | 2005-11-23 | 刘世琦 | Comprehensive utilization method of titanium white waste 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 |
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