CN102976413A - 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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- CN102976413A CN102976413A CN2012104220336A CN201210422033A CN102976413A CN 102976413 A CN102976413 A CN 102976413A CN 2012104220336 A CN2012104220336 A CN 2012104220336A CN 201210422033 A CN201210422033 A CN 201210422033A CN 102976413 A CN102976413 A CN 102976413A
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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 the method that a kind of second oxidation is produced ferric oxide red colorant.
Background technology
Ferric oxide red colorant is very important inorganic color(ed)pigment, have unique physicochemical property and good pigment performance, be widely used in the industries such as coating, building materials (pottery, azulejo, encaustic tile, colored cement product) plastics, its production process route is many, method commonly used is take ferrous salt as raw material at present, the liquid phase ammonia process take industrial ammonia as the oxidation neutralizing agent.But the method need to be used industrial ammonia, and this has just brought the problem of three aspects:: cost is higher; Contain ammonia nitrogen in the waste water, be difficult to thorough processing, form secondary pollution; Industry ammonia is the explosive hazardous chemical of poisonous and harmful, high pressure, in transportation 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 the method that a kind of second oxidation is produced ferric oxide red colorant.It is crystal seed that the present invention adopts alpha-feooh, in the reaction process take calcium mineral salt as neutralizing agent, and adopt preparation titanium dioxide gained byproduct---ferrous sulfate is raw material, by accurate control reaction process, finally obtained 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 the ferric oxide red colorant production cost high, to problems such as secondary environmental pollution and potential safety hazard are large, the present invention to preparation titanium dioxide gained byproduct---ferrous sulfate utilizes, raw material is easy to get.
Technical scheme provided by the invention is:
A kind of second oxidation is produced the method for ferric oxide red colorant, may further comprise the steps:
Step 1, take alpha-feooh as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 50～60%;
Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 10～20%;
Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 60～70 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing;
Employed ferrous sulfate obtains through centrifugation and carrying out washing treatment for the brilliant ferrous sulfate of by-product of preparation titanium dioxide gained in described step 2 and the described step 3.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, in the described step 3, stirs all the time the solution in the oxidation barrel.
Preferably, described second oxidation is produced in the method for ferric oxide red colorant, in the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the 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 the oxidation barrel at 60～70 ℃, the 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 the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, 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 the oxidation barrel at 60～70 ℃, and the 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 the reaction process take calcium mineral salt as neutralizing agent, and adopting the by-product of preparation titanium dioxide gained brilliant---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 the 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, and particle size range is at 100～200nm, and epigranular.Said process solved the ferric oxide red colorant production cost high, to problems such as secondary environmental pollution and potential safety hazard are large, the present invention is brilliant to the by-product of preparation titanium dioxide gained---ferrous sulfate utilizes, and raw material is easy to get.
Description of drawings
Fig. 1 is the schema that second oxidation of the present invention is produced the method for ferric oxide red colorant.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, can implement according to this with reference to the specification sheets literal to make those skilled in the art.
As shown in Figure 1, the invention provides a kind of second oxidation and produce the method for ferric oxide red colorant, may further comprise the steps: step 1, take alpha-feooh as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 50～60%; Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 10～20%; Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 60～70 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing; Employed ferrous sulfate obtains through centrifugation and carrying out washing treatment for the brilliant ferrous sulfate of by-product of preparation titanium dioxide gained in described step 2 and the described step 3.
Described second oxidation is produced in the method for ferric oxide red colorant, in the described step 3, stirs all the time the solution in the oxidation barrel.
Described second oxidation is produced in the method for ferric oxide red colorant, in the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the pH value adds ferrous sulfate and calcium mineral salt for the first time continuously under 2.0～4.5 condition, ferrous sulfate adds with the speed of 180kg/h, keep the temperature of the solution in the oxidation barrel at 60～70 ℃, the pH value adds ferrous sulfate and calcium mineral salt for the second time continuously under 2.0～4.5 condition, ferrous sulfate adds with the speed of 115kg/h.
Described second oxidation is produced in the method for ferric oxide red colorant, in the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, 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 the oxidation barrel 60～70.℃, the pH value adds ferrous sulfate and calcium mineral salt for the second time continuously under 3.0～3.5 condition, 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 has realized the control to the particle diameter of ferric oxide red colorant particle by the control reaction process.The consumption of the crystal seed that at first adds up in step 1 and the step 2 can have influence on the formation speed of red iron oxide particle and the particle diameter of red iron oxide particle.The crystal seed input amount is few with respect to the crystal seed input amount in the step 1 in the step 2, drops into crystal seed in the step 2 after adding ferrous sulfate, helps to control in step 3 oxidising process.
Add at twice calcium mineral salt and ferrous sulfate in the step 3, can guarantee fully carrying out of oxidising process on the one hand, affect on the other hand nucleation rate, so that the ferric oxide red colorant particle forms nano level particle.When adding calcium mineral salt and ferrous sulfate, especially to control temperature and pH value in the oxidation barrel; When temperature and pH value condition satisfy when requiring accordingly, just can add calcium mineral salt and ferrous sulfate.After adding calcium mineral salt and ferrous sulfate for the first time, to pass into speed lower for oxygen in initial 20min, then improves afterwards oxygen and pass into speed, to accelerate the generation of oxidizing reaction, promotes nucleation in the step 3; When adding calcium mineral salt and ferrous sulfate for the second time, then select 60m
3The speed of/h passes into oxygen, with the speed of control crystal growth and the size of crystal.
Embodiment one
Present embodiment prepares ferric oxide red colorant by the following method:
A kind of second oxidation is produced the method for ferric oxide red colorant, may further comprise the steps:
Step 1, take alpha-feooh as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 50%.
Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 35g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 10%; The consumption of the ferrous sulfate in the step 2 is 600kg.
Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 70 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 60 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In the step 3, stir all the time the solution in the 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
Calcium mineral salt is that particle diameter is the Wingdale of 30 μ m in the present embodiment.
Embodiment two
A kind of second oxidation is produced the method for ferric oxide red colorant, may further comprise the steps:
Step 1, take alpha-feooh as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 52%, the mass ratio of crystal seed and water is 1:7.
Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 38g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 18%; The consumption of the ferrous sulfate in the step 2 is 750kg.
Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 75 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 66 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In the step 3, stir all the time the solution in the 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
Calcium mineral salt is that particle diameter is the rhombspar of 50 μ m in the present embodiment.
Embodiment three
A kind of second oxidation is produced the method for ferric oxide red colorant, may further comprise the steps:
Step 1, take alpha-feooh as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 55%.
Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 34g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 10～20%; The consumption of the ferrous sulfate in the step 2 is 800kg.
Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 69 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 60 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add ferrous sulfate and calcium mineral salt to oxidization time 10h, passes into continuously oxygen 10min; In the step 3, stir all the time the solution in the 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing.
Calcium mineral salt is that particle diameter is the Wingdale of 20 μ m in the present embodiment.
Below provide the performance test data of the ferric oxide red colorant of each embodiment.
| Index name | Embodiment one | Embodiment two | Embodiment three |
| The 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％ |
| The 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 the embodiment, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, 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. the method that second oxidation is produced ferric oxide red colorant is characterized in that, may further comprise the steps:
Step 1, take a-FeOOH as crystal seed, crystal seed and water are fed in the oxidation barrel, the crystal seed input amount be ferrous sulfate in the subsequent step two total consumption 50～60%;
Step 2, the pH value of adjusting the solution in the oxidation barrel with a small amount of sulfuric acid are 4, and be warming up to 70～73 ℃, solution in oxidation barrel adds ferrous sulfate, making the concentration of ferrous sulfate in solution is 30～40g/L, solution in the oxidation barrel drops into crystal seed again, the crystal seed input amount be ferrous sulfate used in the step 2 consumption 10～20%;
Continue to pass into oxygen in the solution of step 3, the oxidation barrel that obtains to step 2 and carry out oxidation, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the 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, to oxidization time 20h, it is 150m that oxygen passes into speed at initial 20min
3/ h, stop to add ferrous sulfate and calcium mineral salt to oxidization time 20h, after passing into continuously oxygen 10min, keep the temperature of the solution in the oxidation barrel at 60～70 ℃, the 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, and it is 60m that oxidization time 10h, oxygen pass into speed
3/ h stops to add 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, with isolated red iron oxide slurry through washing, press filtration, oven dry and pulverizing;
Employed ferrous sulfate obtains through centrifugation and carrying out washing treatment for the byproduct ferrous sulfate of preparation titanium dioxide gained in described step 2 and the described step 3.
2. second oxidation as claimed in claim 1 is produced the method for ferric oxide red colorant, it is characterized in that, in the described step 3, stirs all the time the solution in the 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 the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, the 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 the oxidation barrel at 60～70 ℃, the 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 the described step 3, keep the temperature of the solution in the oxidation barrel at 68～75 ℃, 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 the oxidation barrel at 60～70 ℃, the pH value is under the condition of 3.O～3.5, 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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