CN105129866A - Method of producing iron oxide red through iron sulfate hydrothermal process - Google Patents
Method of producing iron oxide red through iron sulfate hydrothermal process Download PDFInfo
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- CN105129866A CN105129866A CN201510577235.1A CN201510577235A CN105129866A CN 105129866 A CN105129866 A CN 105129866A CN 201510577235 A CN201510577235 A CN 201510577235A CN 105129866 A CN105129866 A CN 105129866A
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- iron oxide
- oxide red
- red iron
- ferrous sulfate
- iron
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Abstract
The invention relates to a method of producing iron oxide red through an iron sulfate hydrothermal process. The method of producing iron oxide red through the iron sulfate hydrothermal process comprises the steps of dissolving iron sulfate in water to prepare an Fe<2+> solution with the concentration of 0.1 to 1 mol/L, slowly dripping ammonia water under the condition of full agitation, regulating the pH value of the solution to 8 to 10, feeding oxygen or air, performing room-temperature reaction for 1 to 24h under agitation to obtain Fe(OH)3 colloids and filtrate, preparing the Fe(OH)3 colloids into a colloid solution with the total iron concentration being 0.5 to 2 mol/L, adding iron oxide red crystal seeds and heptahydrate iron sulfate, performing hydrothermal reaction for 0.5 to 3h at 200 to 300 DEG C in a high-pressure kettle, then performing filtration, washing, drying and crushing to obtain the iron oxide red, performing ammonia precipitation, and then recovering ammonium sulfate through evaporative crystallization of filtrate or preparing ammonia water through stripping. By preparing the iron oxide red by using the iron sulfate hydrothermal process, the process is simple, and the production cost of the iron oxide red is reduced and the environmental and economic benefits are great.
Description
Technical field
The invention belongs to inorganic powder material preparation field, be specifically related to a kind of method utilizing ferrous sulfate production red iron oxide.
Background technology
Ferrous sulfate is mainly derived from titanium white production, and titanium dioxide (being commonly called as titanium white) is current most important a kind of white pigment in the world, and its production technique mainly contains sulfuric acid process and chlorination process.China's titanium dioxide output in 2014 reaches 246.6 ten thousand tons, and wherein the Producing Titanium Dioxide overwhelming majority of China adopts sulfuric acid process.Adopt Production By Sulfuric Acid Process titanium white, often produce 1 ton of titanium dioxide and will discharge 3.5 ~ 4 tons, ferrous sulfate, nearly 9,000,000 tons of the ferrous sulfate that China discharges for 2014, so a large amount of ferrous sulfate (FeSO
47H
2o) if do not fully not utilized, not only environment is polluted but also waste valuable resource.At present, ferrous sulfate can be used for preparing water purification agent, fodder additives, iron catalyst, reagent grade sulfuric acid ferrous iron, chemical fertilizer, but consumption is all less.If be used for preparing the red iron oxide of high added value, not only can solve the problem, and considerable economic benefit can be brought.
Red iron oxide (α-Fe
2o
3) as a kind of important mineral dye, due to the performance that it is superior, as nontoxicity, chemical stability, wearing quality and low cost etc., be widely applied, as building trade pigment, inorganic dyestuff, pottery, paper industry pigment and sorbent material, paint, plastics etc.
The production method of red iron oxide is divided into dry method and wet method 2 kinds, and dry process has green vitriol calcination method, iron oxide yellow calcination method, iron black calcination method etc.; Wet processing has sulphate process, nitrate process, hydrothermal method, catalysis method etc.The feature that wherein hydrothermal method is produced is that particle purity is high, good dispersity, good crystalline and can control.Publication number is a kind of method that the Chinese patent of CN1903735A discloses ferrous sulfate hydrothermal method production red iron oxide, it is the hydro-thermal reaction in oxygen pressure, its process reaction pressure high (1.2-2.2MPa), need excess of ammonia water, its alkali consumption is large, raw materials cost is high; Reaction end pH value controls unstable, and the oxidation of reaction soln ferrous ions is incomplete, red iron oxide unstable product quality; The complex process of multistage oxidizing reaction, production cost is high.Publication number is a kind of method that the Chinese patent of CN101792185A discloses iron-containing liquor hydrothermal method and prepares flake ferric oxide, and it, to obtain Fe-laden acid immersion liquid containing ferric iron waste residue and sulfuric acid reaction, prepares ferric oxide through hydro-thermal reaction.
Summary of the invention
The object of this invention is to provide a kind of method utilizing ferrous sulfate production red iron oxide.
The present invention utilizes copperas solution and ammoniacal liquor to be obtained by reacting containing Fe (OH)
2suspension liquid, passes into oxygen or air-making for Fe (OH)
3the precursor of colloid, gained Fe (OH)
3gel filtration washs, and filter cake adds growth-regulating agent (iron oxide red seed crystal and seven water vitriol ferrous) and directly proceeds to autoclave and carry out hydro-thermal reaction after dilution.Filtration after reacting, washing, drying, pulverizing obtain spherical red iron oxide.
Concrete steps are as follows:
A. preparation soluble in water for ferrous sulfate is contained Fe
2+solution, arranges Fe
2+concentration is 0.1 ~ 1mol/L, slowly drips ammoniacal liquor under abundant agitation condition, and regulator solution pH value is 8 ~ 9.5, passes into oxygen or air under agitation room temperature reaction 1 ~ 24 h, and washing obtains Fe (OH) after filtration
3colloid and filtrate.
B. Fe (OH) is got
3the colloidal solution that total concentration of iron is 0.5 ~ 2 mol/L prepared by colloid, presses
n(Fe
2+)/
n(Fe
3+) be 0.01 ~ 0.1 amount ratio add iron vitriol, by 1 ~ 10 g/L add red iron oxide.The colloidal solution prepared is transferred to autoclave stir, hydrothermal temperature is 200 ~ 300 ° of C, and the hydro-thermal reaction time is 0.5 ~ 3 h.
C. filtered by hydro-thermal reaction products therefrom, filter cake is dry after washing, pulverize and obtain spherical red iron oxide, after ammonia precipitation process, filtrate is through evaporative crystallization reclaim(ed) sulfuric acid ammonium or prepare ammoniacal liquor through stripping.
Advantage of the present invention is:
(1) this technology products obtained therefrom steady quality, composition is α-Fe
2o
3, purity can reach more than 96%, and color is from garnet, and bright red, to scarlet, has fabulous tinting strength, opacifying power, shielding, dispersiveness, and the characteristic such as fast light, weather-proof, heat-resisting, and this product can be used as coating, pigment and ceramic glaze etc.;
(2) utilize ferrous sulfate to prepare red iron oxide, titanium white by product thing green vitriol is utilized, there is environmental benefit and economic benefit;
(3) hydro-thermal reaction does not need to carry out in highly basic medium, and without the need to oxygen pressure, technique is simple, reduces alkali consumption, reduces production cost;
(4) be precipitation agent with ammoniacal liquor, the filtrate after filtration obtains byproduct of ammonium sulfate through evaporative crystallization or prepares ammoniacal liquor through stripping, makes recovery ammonia recycle.
The invention solves conventional hydrothermal method alkali consumption large, oxygen pressure is high, unstable product quality, the difficult problem that production cost is high.
Embodiment
Embodiment 1:
fe (OH)
3the preparation of colloid: get ferrous sulfate (main component FeSO
44H
2o) 106.8 g, preparation Fe
2+concentration be copperas solution 700 mL of 0.6 mol/L in 1000 mL three-necked bottles, under abundant agitation condition, slowly drip strong aqua regulate reaction soln initial pH value to 9.5.Oxygen flow is 0.4 L/min, and stirring velocity is 450 r/min, after reacting 1.5 h, stops ventilation under room temperature.Abundant washing, vacuum filtration obtains Fe (OH)
3colloid.
the preparation of red iron oxide: get the above-mentioned Fe of 288.6 g (OH)
3colloidal solution 300 mL that total concentration of iron is 1.25 mol/L prepared by colloid, by n (Fe
2+)/n (Fe
3+) be that the ratio of 0.08 amount adds 7.784 g, be that 5 g/L add 1.5 g red iron oxides (Sanhuan Pigment Co., Ltd., Hunan Prov., ultrafine iron oxide red H130M) by concentration.The colloidal solution prepared is transferred to autoclave and carries out hydro-thermal reaction, arranging stirring velocity is 300 r/min, and temperature of reaction is 230 ° of C, the quick cooling reactor of pipe water coolant in adopting after reacting 30 min.Finally, gained hydrothermal product takes out from reactor, and filtration, washing, drying, pulverizing obtain product.Show that product thing is α-Fe mutually through x-ray diffraction experiment
2o
3.The spherical red iron oxide purity of hydro-thermal reaction gained is 96.32%, and quality is 31.23 g, and productive rate is 95.5%, and its color is garnet, median size 0.66 μm.Major impurity Mg in product, the content of Ti, Mn, Al and Zn is respectively 0.013%, 1.73%, 0.188%, 0.057% and 0.012%.
Embodiment 2:
fe (OH)
3the preparation of colloid: get titanium white by product thing and dry ferrous sulfate 600 g and reduced iron powder 2.3 g, saturated dissolving under 64 ° of C, slowly cools to 10 ° of C recrystallizations, obtains 1 ferrous 634.6 g of POV, crystallization yields 89.46%.Get 1 ferrous 126.3 g of POV, preparation Fe
2+concentration be copperas solution 700 mL of 0.6 mol/L in 1000 mL three-necked bottles, under abundant agitation condition, slowly drip strong aqua regulate reaction soln initial pH value to 9.5.Oxygen flow is 0.3 L/min, and stirring velocity is 400 r/min, after reacting 2.5 h, stops ventilation under room temperature.Abundant washing, vacuum filtration obtains Fe (OH)
3colloid.
the preparation of red iron oxide: get the above-mentioned Fe of 273.7 g (OH)
3colloidal solution 300 mL that total concentration of iron is 1.25 mol/L prepared by colloid, presses
n(Fe
2+)/
n(Fe
3+) be that the ratio of 0.1 amount adds 9.452 g, be that 5 g/L add 1.5 g red iron oxides by concentration.The colloidal solution prepared is transferred to autoclave and carries out hydro-thermal reaction, arranging stirring velocity is 350 r/min, and temperature of reaction is 260 ° of C, the quick cooling reactor of pipe water coolant in adopting after reacting 30 min.Finally, gained hydrothermal product takes out from reactor, and filtration, washing, drying, pulverizing obtain product.Show that product thing is α-Fe mutually through x-ray diffraction experiment
2o
3.The spherical red iron oxide purity of hydro-thermal reaction gained is 98.4%, and quality is 30.96 g, and productive rate is 96.7%, and its color is bright red, median size 0.62 μm.Major impurity Mg in product, the content of Ti, Mn, Al and Zn is respectively 0.007%, 0.299%, 0.129%, 0.029% and 0.009%.
Embodiment 3:
fe (OH)
3the preparation of colloid: get titanium white by product thing and dry ferrous sulfate 600 g and reduced iron powder 2.3 g, saturated dissolving under 64 ° of C, slowly cools to 10 ° of C recrystallizations, obtains 1 ferrous 634.6 g of POV, crystallization yields 89.46%.Get 1 ferrous 400 g of POV, saturated dissolving at 64 DEG C, slowly cools to 10 ° of C recrystallizations, obtains 2 ferrous 307.3 g of POV, crystallization yields 78.74%.Get 2 ferrous 102.6 g of POV, preparation Fe
2+concentration be copperas solution 700 mL of 0.5 mol/L in 1000 mL three-necked bottles, under abundant agitation condition, slowly drip strong aqua regulate reaction soln initial pH value to 9.Air flow quantity is 1.5 L/min, and stirring velocity is 200 r/min, after reacting 12 h, stops ventilation under room temperature.Abundant washing, vacuum filtration obtains Fe (OH)
3colloid.
the preparation of red iron oxide: get the above-mentioned Fe of 222.2 g (OH)
3colloidal solution 300 mL that total concentration of iron is 1 mol/L prepared by colloid, presses
n(Fe
2+)/
n(Fe
3+) be that the ratio of 0.01 amount adds 0.8 g, be that 1 g/L adds 0.3 g red iron oxide by concentration.The colloidal solution prepared is transferred to autoclave and carries out hydro-thermal reaction, arranging stirring velocity is 250 r/min, and temperature of reaction is 200 ° of C, the quick cooling reactor of pipe water coolant in adopting after reacting 1 h.Finally, gained hydrothermal product takes out from reactor, and filtration, washing, drying, pulverizing obtain product.Show that product thing is α-Fe mutually through x-ray diffraction experiment
2o
3.The spherical red iron oxide purity of hydro-thermal reaction gained is 98.8%, and quality is 23.37 g, and productive rate is 95%, and its color is scarlet, median size 0.58 μm.Major impurity Mg in product, the content of Ti, Mn, Al and Zn is respectively 0.005%, 0.063%, 0.080%, 0.025% and 0.004%.
Embodiment 4:
fe (OH)
3the preparation of colloid: get titanium white by product thing and dry ferrous sulfate 6000 g and reduced iron powder 23 g, saturated dissolving under 64 ° of C, slowly cools to 10 ° of C recrystallizations, obtains 1 ferrous 6366 g of POV, crystallization yields 90.5%.Get 1 ferrous 1431 g of POV, preparation Fe
2+concentration be copperas solution 8000 mL of 0.6 mol/L in 10 L three-necked bottles, under abundant agitation condition, slowly drip strong aqua regulate reaction soln initial pH value to 9.5.Oxygen flow is 3 L/min, and stirring velocity is 250 r/min, after reacting 2 h, stops ventilation under room temperature.Abundant washing, vacuum filtration obtains Fe (OH)
3colloid.Use ammoniacal liquor adjust ph to be after 7 in filter liquor, add hydrogen peroxide, fully stir, leave standstill 2 h, filter and obtain ammoniumsulphate soln, evaporative crystallization obtains white solid ammonium sulfate 602 g.
the preparation of red iron oxide: get the above-mentioned Fe of 3251 g (OH)
3colloidal solution 3500 mL that total concentration of iron is 1.25 mol/L prepared by colloid, presses
n(Fe
2+)/
n(Fe
3+) be that the ratio of 0.08 amount adds 90 g, be that 5 g/L add 17.5 g red iron oxides by concentration.The colloidal solution prepared is transferred to autoclave and carries out hydro-thermal reaction, arranging stirring velocity is 300 r/min, and temperature of reaction is 230 ° of C, the quick cooling reactor of pipe water coolant in adopting after reaction 30min.Finally, gained hydrothermal product takes out from reactor, and filtration, washing, drying, pulverizing obtain product.Show that product thing is α-Fe mutually through x-ray diffraction experiment
2o
3.The spherical red iron oxide purity of hydro-thermal reaction gained is 98.5%, and quality is 366.8 g, and productive rate is 98.3%, and its color is bright red, median size 0.65 μm.Major impurity Mg in product, the content of Ti, Mn, Al and Zn is respectively 0.005%, 0.268%, 0.106%, 0.027% and 0.008%.
Claims (3)
1. a method for ferrous sulfate hydrothermal method production red iron oxide, is characterized in that: by preparation soluble in water for ferrous sulfate containing Fe
2+solution, Fe
2+concentration is 0.1 ~ 1 mol/L, slowly drips ammoniacal liquor under abundant agitation condition, and regulator solution pH value is 8 ~ 9.5, passes into oxygen or air under agitation room temperature reaction 1 ~ 24 h, and washing obtains Fe (OH) after filtration
3colloid and filtrate; With gained Fe (OH)
3the colloidal solution that total concentration of iron is 0.5 ~ 2 mol/L prepared by colloid, add growth-regulating agent again, colloidal solution is transferred to autoclave and under agitation carry out hydro-thermal reaction, hydrothermal temperature is 200 ~ 300 ° of C, the hydro-thermal reaction time is 0.5 ~ 3 h, obtains red iron oxide after reaction through filtration, washing, drying, pulverizing.
2. the method for ferrous sulfate hydrothermal method production red iron oxide according to claim 1, is characterized in that: described growth-regulating agent is red iron oxide and ferrous sulfate, adds red iron oxide, press by 1 ~ 10 g/L
n(Fe
2+)/
n(Fe
3+) be 0.01 ~ 0.1 amount ratio add ferrous sulfate.
3. the method for ferrous sulfate hydrothermal method production red iron oxide according to claim 1, is characterized in that: after ammonia precipitation process, filtrate is through evaporative crystallization reclaim(ed) sulfuric acid ammonium or prepare ammoniacal liquor through stripping.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385858A (en) * | 2015-11-03 | 2016-03-09 | 中南大学 | Method for preparing iron oxide red and recycling silver through ferroalumen residues |
| CN105694539A (en) * | 2016-02-29 | 2016-06-22 | 中国科学院兰州化学物理研究所 | Method for preparing iron oxide red hybridization pigment by means of clay minerals |
| CN106430326A (en) * | 2016-10-17 | 2017-02-22 | 中国有色集团（广西）平桂飞碟股份有限公司 | Method for producing high-performance iron oxide red from hydrothermal ultra-fine grains |
| CN109806896A (en) * | 2019-01-31 | 2019-05-28 | 鲍君杰 | A kind of preparation method of the composite phosphorized iron of cladded type |
| CN109810546A (en) * | 2019-04-04 | 2019-05-28 | 河北工业大学 | The method for preparing shiny red iron oxide red hybrid pigment using iron tailings |
| CN111320479A (en) * | 2020-03-06 | 2020-06-23 | 山东国瓷功能材料股份有限公司 | Nano zirconium oxide material, preparation method and application thereof |
| CN113929150A (en) * | 2021-09-06 | 2022-01-14 | 江苏宇星科技有限公司 | Production process for preparing iron oxide red serving as precursor of lithium iron phosphate by hydrothermal method of ferrous sulfate serving as titanium dioxide byproduct |
| CN115849455A (en) * | 2022-12-02 | 2023-03-28 | 江苏宇星科技有限公司 | Preparation method of high-purity ferric hydroxide |
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| CN101792185A (en) * | 2010-01-28 | 2010-08-04 | 中南大学 | Method for preparing lamellar ferric oxide by ferreous solution ammonia precipitation method |
| CN104528835A (en) * | 2014-12-26 | 2015-04-22 | 常熟洛克伍德颜料有限公司 | Method for preparing iron oxide red from pyrite roasting residues by using hydrothermal method |
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2015
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101792185A (en) * | 2010-01-28 | 2010-08-04 | 中南大学 | Method for preparing lamellar ferric oxide by ferreous solution ammonia precipitation method |
| CN104528835A (en) * | 2014-12-26 | 2015-04-22 | 常熟洛克伍德颜料有限公司 | Method for preparing iron oxide red from pyrite roasting residues by using hydrothermal method |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385858A (en) * | 2015-11-03 | 2016-03-09 | 中南大学 | Method for preparing iron oxide red and recycling silver through ferroalumen residues |
| CN105694539A (en) * | 2016-02-29 | 2016-06-22 | 中国科学院兰州化学物理研究所 | Method for preparing iron oxide red hybridization pigment by means of clay minerals |
| CN105694539B (en) * | 2016-02-29 | 2018-05-08 | 中国科学院兰州化学物理研究所 | A kind of method that iron oxide red hybrid pigment is prepared using clay mineral |
| CN106430326A (en) * | 2016-10-17 | 2017-02-22 | 中国有色集团（广西）平桂飞碟股份有限公司 | Method for producing high-performance iron oxide red from hydrothermal ultra-fine grains |
| CN106430326B (en) * | 2016-10-17 | 2018-02-06 | 中国有色集团（广西）平桂飞碟股份有限公司 | The method of the ultra-fine seed production high-performance iron oxide red of hydro-thermal |
| CN109806896B (en) * | 2019-01-31 | 2021-11-19 | 鲍君杰 | Preparation method of coated composite iron phosphide |
| CN109806896A (en) * | 2019-01-31 | 2019-05-28 | 鲍君杰 | A kind of preparation method of the composite phosphorized iron of cladded type |
| CN109810546A (en) * | 2019-04-04 | 2019-05-28 | 河北工业大学 | The method for preparing shiny red iron oxide red hybrid pigment using iron tailings |
| CN109810546B (en) * | 2019-04-04 | 2020-12-29 | 河北工业大学 | Method for preparing bright red iron oxide red hybrid pigment by using iron tailings |
| CN111320479A (en) * | 2020-03-06 | 2020-06-23 | 山东国瓷功能材料股份有限公司 | Nano zirconium oxide material, preparation method and application thereof |
| CN111320479B (en) * | 2020-03-06 | 2022-05-31 | 山东国瓷功能材料股份有限公司 | Nano zirconium oxide material, preparation method and application thereof |
| CN113929150A (en) * | 2021-09-06 | 2022-01-14 | 江苏宇星科技有限公司 | Production process for preparing iron oxide red serving as precursor of lithium iron phosphate by hydrothermal method of ferrous sulfate serving as titanium dioxide byproduct |
| CN115849455A (en) * | 2022-12-02 | 2023-03-28 | 江苏宇星科技有限公司 | Preparation method of high-purity ferric hydroxide |
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