Method for production of natural iron oxide pigment from ore

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of production of natural red iron oxide pigment from ore includes its reduction, cleaning using the method of magnetic separation and repeated reduction. The ore used can be hematite, martite, hydrohematite. First the ore is reduced to size no less than 10 mm, then it is reduced using wet method to particle size of 60-80% class smaller than 40 μm and is classified in 4 stages. Elutriation includes main elutriation, first rewashing, first control and second control hydrocycling. Then the oxidative destruction of sulfides contained in the ore is performed, as well as thickening and drying with simultaneous disintegration and dry elutriation of pigment.

EFFECT: increased pigment output, production environmental friendliness, decreased sulfur content in pigment and decreased waste amount.

1 dwg, 1 ex

 

The invention relates to a method for natural (not synthetic) iron oxide pigments that can be used in a special anti-corrosion primers used including for the needs of shipbuilding. Also the method can be used to produce rare and very expensive brands of pigments, including transparent, for the needs of the pharmaceutical, cosmetic and food industry.

Known "Method of production of red iron oxide pigment (patent RU No. 2303046). A method of obtaining a red iron oxide pigment includes oxidation of aqueous sulphate solutions or suspensions hydroxide iron (II) oxygen at steady-state values of temperature and pH of the reaction medium, hydrothermal heat treatment of the suspension of oxyhydroxide iron (III) in batch or continuous mode in autoclaves, washing of the pigment from the water-soluble salts, drying and grinding of the pigment. In the process of hydrothermal treatment on the FeOOH suspension effect of nanosecond electromagnetic pulses with the following characteristics: pulse duration from 0.5 to 5 NS, pulse amplitude 4-10 kV, pulse repetition rate of 200-1000 Hz, the process is carried out at a temperature of 130-200°C. the Invention allows to reduce the temperature of the hydrothermal treatment FeOOH suspension and increase produced by the productivity of the process to obtain a red iron oxide pigment.

The main disadvantages of the method are the complexity of the production of a pigment, the environmental hazards of the process.

Known way to "Getting the iron sludge micron size class" (patent RU №2354672). The invention relates to iron oxide (III) lamellar structure, which can be used as a pigment. Natural mechanically crushed iron oxide (III), lamellar structure which is at least 50 wt.%, preferably 75 wt.%, contains particles smaller than 10 μm in the amount of at least 50 wt.%, preferably 70 wt.%, particularly preferably 90 wt.%. The ratio of the thickness to the maximum diameter of the plates of iron oxide (III) is 1:5, preferably 1:10. To obtain such iron oxide (III) mechanically ground in an impact mill or jet mill. The resulting mechanical grinding iron oxide (III) divided by the size of particles, for example via an air separator.

The main disadvantages of the method in the difficulty of obtaining high-quality pigment on the proposed "dry" technology, low yield of pigment.

Known "Method of production of iron oxide pigment from specularity" (patent RU №2366674)adopted for the prototype. To obtain iron oxide pigment from specularite first lead crushed the e specularite to a particle size greater than 1-5 mm, then spend the enrichment method of magnetic separation to the content of Fe2O3more than 60.0 wt.%, then the enriched specularite again crushed. Enriched specularity can be obtained pigment with a matte sheen, consisting of iron sludge with the content of Fe2O3more than 85 wt.%, which includes a thin scaly plates more than 50 wt.%, and characterized by residue after wet sieving sieve with openings 63 μm is not more than 35 wt.%. The invention can be obtained from specularite pigments for decorative and protective and decorative coatings.

The main disadvantages of this method are the low output conditioned pigment from the source of raw materials, the difficulty of obtaining high-quality pigment.

The technical result of the invention is to increase the yield of the finished pigment, improving the quality of pigment.

The technical result is achieved in that in the method of obtaining natural red iron oxide pigment from the ore, including the crushing, beneficiation method of magnetic separation and re-grinding, the ore is initially crushed to a size not more than 10 mm, re-pulverized by a wet method to the particle size of 60-80% of the class are smaller than 40 microns, are classified in 4 stages, including the main classification, the first perekisnoe, the first control and vtoro the control gidrotsiklonirovanija, then subjected to oxidative degradation, concentrated and dried with simultaneous disintegration and air classification of pigment.

Source of iron ore is initially crushed to a particle size of not more than 10 mm, the particle Size of crushed ore less than 10 mm due to the equipment used for crushing, the particle size of crushed ore than 10 mm significantly reduces the efficiency of ball mill with further re-grinding.

Then finely chopped ore is fed into the enrichment method of magnetic separation in a magnetic separator, which separates the magnetic fractions of iron ore from non-magnetic. Magnetic fraction used as raw materials for the metallurgical industry. The nonmagnetic fraction is used for the production of pigment by the proposed method.

The non-magnetic fraction of iron ore re-pulverized by a wet method to the particle size of 60-80% of the class are smaller than 40 microns in a ball mill with adjustable asynchronous drive. Ball mill operates in open loop.

Then the crushed ore is classified into 4 stages, including the main classification, the first perekisnoe, the first control and the second control hydrocyclone. The basic classification takes place in the spiral classifier, immersed spiral. When this occurs the separation of the heavier is less crushed hematite particles of a black color, are removed from the process and used as raw materials for the metallurgical industry.

Plums from perekisnogo and the first hidrociclonului unite and send in an ultrasonic reactor (ILA), where regrinding and disintegration of large particles and the oxidation of the sulfide ore, which are harmful impurity. The reactor is also fed to the air. As a result of interaction formed under the action of ultrasound radicals, sulfides are oxidized and removed.

Processed in the ultrasonic reactor slurry thickens in the thickener, which additionally serves the flocculant solution to accelerate the deposition of particles of ore. Condensed product containing 50÷55% of the solid phase is sent for drying.

Drying is carried out in automatic pneumatic spray dryer equipped with a cage mill and cyclone. In the drying process occurs simultaneously disintegration (destruction) and air classification of pigment particles to the preset sizes (not less than 80% - 15 μm). The finished pigment in powder form with particle size (not less than 80% - 15 μm) of an automatic bag filter is fed to the packing and loading.

As a raw material for producing red iron oxide pigment can be used hematite, martite, hydrohematite ore.

The proposed method allows to obtain high is acetonyl and inexpensive (compared to synthetic) pigment particle size (80% - 15 μm). Obtained by the proposed method, the pigment on the main quality indicators corresponds to the best examples of synthetic red iron oxide pigments, with the exception of tones (average). For some parameters obtained by the proposed method, the pigment is superior to synthetic analogues, since it contains almost no sulfate and chloride ions, has an optimal particle size distribution.

The production of the pigment of the proposed method is high-efficient, virtually waste-free and has no impact on the environment.

Example. The pilot batch of pigment from hydrohematite ore. The original ore particle size 100 - 0 mm was crushed to a size 10 - 0 mm, was crushed wet up to 70% of the class smaller than 40 μm, classified into 4 stages: the main classification of spiral classifier, immersed coil LTR; perekisnoe gidrotsiklonirovanija, the first and second control hydrocyclone were held, respectively, in hydrocyclones ⌀ 350 mm, ⌀ 250 mm, ⌀ 160 mm, Then drain hydrocyclone was subjected to oxidative degradation in the ultrasonic rector and thickening. The condensed product was dried with simultaneous disintegration, and was produced by air classification of the obtained pigment.

The resulting pigment fully meet the requirements of GOST 8135-74. The particle size of the pigment was 85% of the class is 15 μm, and the hiding power of the pigment was 10 g/m2. Sulfur in the pigment generally is not detected.

The method of obtaining natural red iron oxide pigment from the ore, including the crushing, beneficiation method of magnetic separation and re-grinding, characterized in that the ore is initially crushed to a size not more than 10 mm, re-pulverized by a wet method to the particle size of 60-80% of the class are smaller than 40 microns, are classified in 4 stages, including the main classification, the first perekisnoe, the first control and the second control gidrotsiklonirovanija, then subjected to oxidative degradation, concentrated and dried with simultaneous disintegration and air classification of pigment.



 

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FIELD: chemistry.

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1 dwg, 1 ex

FIELD: chemistry.

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1 ex

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SUBSTANCE: to obtain an iron-containing pigment, aqueous solutions of sodium or ammonium carbonate and magnesium chloride or sulphate are first mixed in equimolar ratio. A magnesium carbonate pulp is obtained and settled. After that the clear portion is decanted and washed 2-3 times with water in volume ratio pulp : water=1:(2-3), each time decanting the clear portion. Iron (III) sulphate solution is then added to the magnesium carbonate pulp. The obtained residue of iron hydroxides or hydroxocarbonates is filtered off, washed with water, dried and annealed.

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2 tbl, 2 ex

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9 cl, 3 tbl, 3 ex

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1 cl, 2 tbl, 15 ex

FIELD: chemistry.

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8 cl, 2 tbl, 5 ex

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1 tbl

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1 tbl, 12 ex

FIELD: chemical and paint-and-varnish industries; production of inorganic pigments.

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2 cl, 5 tbl, 6 ex

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9 cl, 12 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to production of black iron oxide pigments and can be used in paint and coating industry. The black iron oxide pigment is obtained from burning red mud - aluminous production waste. Before burning, the red mud is sorted according to size, with selection of the 0.02 mm fraction and further selection of the 0.02-0.045 mm fraction. These fractions are burnt in a controlled atmosphere with oxygen deficiency at 500-1000°C temperature.

EFFECT: obtaining iron oxide pigment of a pure black colour with 8-10 g/m2 coverage using aluminous production wastes - red mud, without more raw materials and additives and pollution of the environment.

1 tbl

FIELD: chemistry.

SUBSTANCE: natural mechanically milled iron (III) oxide of lamellar structure at least 50 wt %, preferentially 75 wt %, contains particles sized 10 mcm and less in amount, at least, 50 wt %, preferentially 70 wt %, particularly preferentially 90 wt %. The ratio of thickness to maximum diametre of iron (III) oxide plates is 1:5, preferentially 1:10. To produce such iron (III) oxide, it is mechanically milled in an impactor or a jet-type mill. Iron (III) oxide resulted from mechanical milling, is separated by size grade, e.g. by an air separator. Iron (III) oxide can be used in lacquering for a base corrosion protection, mechanical load protection, UV and IR protection, for decorative coating, and also as an extender for polymeric and ceramic materials.

EFFECT: possibility to prepare highly dispersed lamellar particles of natural iron oxide.

15 cl

FIELD: chemistry.

SUBSTANCE: method for preparation of iron oxide pigment from specularite includes specularite milling up to particle size more than 1 mm - 5 mm, after material concentration with magnetic separation up to content of α-Fe2O3 more than 60.0 wt % specularite is concentrated again. Concentrated specularite can serve as starting material for obtaining of pigment with dull luster consisting of iron mica with Fe2O3 content more than 85 wt % which includes thin scaly plates in amount more than 50 wt % and is featured with residue after wet sieving on a sieve with mesh size 63 mcm not more than 35 wt %.

EFFECT: invention allows to obtain pigments from specularite for protective-decorative and decorative coatings.

8 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to protection of metals from corrosion using lacquer coatings. The engineering problem is solved using a method of preparing an anticorrosion pigment based on aspiration dust wastes from foundry electric furnaces. The aspiration dust is mixed with calcium hydroxide in water with content of calcium hydroxide in the mixture with aspiration dust equal to 8-11 wt %, and aspiration dust with calcium hydroxide in water is taken in ratio of 1:1 respectively. The obtained mixture is dried, calcined at 820-900°C for 3.5-5.5 hours and then ground up to the required degree of dispersion.

EFFECT: possibility of simplifying preparation of a highly efficient anticorrosion pigment and without presence of toxic components in it, as well as reduction of cost of the pigment and environmental conservation.

1 cl, 2 tbl, 15 ex

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