Method of preparing iron oxide pigments

FIELD: chemistry.

SUBSTANCE: to prepare iron oxide pigments, wastes formed during hydraulic borehole mining for iron ore in form of mud containing martite, iron mica, goethite, magnetite and chamosite are mixed with a superplasticiser in ratio of 1:0.05 and wet grinding is carried out. Thermal treatment is then carried out for 1-1.5 hours at 100-150°C and next grinding is carried out in a disintegrator to obtain a 0.8-1.0 mcm fraction of the composition. The obtained iron oxide pigment has a brick-red colour, density of 4.42 g/cm3 and low oil consumption.

EFFECT: invention enables recycling of mining wastes and reduces power consumption.

1 ex

 

The invention relates to coatings industry, namely the method of production of pigments.

A method of obtaining brown iron-containing pigment of fine dust (sludge) open hearth and electric steel plants by hydrothermal treatment at 60-80°C. for 1.0 to 1.5 h in a mixture with one-deputizing calcium phosphate in a ratio of 1:0,05-0,08 followed by hillshade derived from water-soluble substances and heat it at 150-350°C, and calcium phosphate can be obtained by the interaction of 50-65%orthophosphoric acid and othonoi marble dust, taken in the ratio of 4.0 to 6.0:1. (EN 2057154, IPC C09C 1/24).

The disadvantage of this method is the high energy costs in the production process, negative environmental factors in the process of pigment production.

Task, which is aimed at solving the present invention is to reduce energy costs, improve environmental conditions in the preparation of pigments, waste disposal in the mining industry.

The essence of the method is the following: waste generated in borehole hydropobic iron ore in the form of sludge, mixed with a plasticizer in a ratio of 1:0.05 and carry out wet grinding. Then produce heat treatment of the mixture for 1-1 .5 hours at a temperature of 100-150°C, produce subsequent rasmol disintegrator to obtain the fractional composition of 0.8-1.0 μm.

In the process of hydropobic rich iron ore (Kursk magnetic anomaly) by means of a hydraulic borehole mining produces a lot of waste in the form of sludge, containing: wt%: extracted, iron oxide 61-65; goethite 8,2; magnetite 4,8; chamosite 8,5.

Waste in the form specified sludge type plasticizer ("Melflux" - refers to a group of polycarboxylates) in the ratio 1:0,05%, mix and perform wet grinding in the mill. After producing the heat treatment of the mixture of sludge with a superplasticizer at t=100-150°C for 1-1 .5 hours.

The resulting powder has a large spread on the fractional composition, so make repeated grinding in a disintegrator to obtain the fractional composition of 0.8-1.0 μm. The resulting pigment red-brown color and has good hiding power (54.6 g/m2) and has a low oil absorption (19.5 g/100 g), which is important in the production of paints and varnishes based on it, used to protect structures from the effects of aggressive environments.

The density of the obtained pigment-based waste hydraulic borehole mining of iron ores - 4.4 g/cm3.

Example.

Sludge waste hydropobic iron ore in the amount of 100 kg is mixed with superplasticizer "Melflux in the ratio 1:0,05, ie 2 kg, and produce grinding the mixture in a disintegrator.

Then, for 70 minutes at t=120°C produced the W ill result of the heat treatment of the mixture of iron oxide sludge with a superplasticizer.

After heat treatment in the cage carefully grinding the mixture to obtain the fractional composition of 1.5 mm.

The obtained iron oxide pigment has a density of 4.42 g/cm3has superior paint performance and can be used for the manufacture of paints and primers, for use in corrosive environments.

The way to obtain iron oxide pigments comprising mixing the sludge with another component and the heat-treated mixture, characterized in that the waste generated in borehole hydropobic iron ore, in the form of slurries containing extracted, iron oxide, goethite, magnetite, chamosite, mixed with superplasticizer as another component in the ratio of 1:0.05 and carry out wet grinding, then produce heat treatment of the mixture for 1-1,5 hours at a temperature of 100-150°C, produce subsequent grinding in a disintegrator to obtain the fractional composition of 0.8-1.0 μm.



 

Same patents:

FIELD: chemistry.

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.

EFFECT: invention increases output when preparing a pigment owing to 2-3 times faster filtration of the iron-containing residue.

2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in making paint, construction and ceramic materials, glass, enamel, plastic and rubber. The iron oxide based pigment contains two fractions of iron (III) oxide. The first fraction has a plastic structure with particle size not smaller than 20 mcm. The second fraction consists of particles of different shapes with size not bigger than 20 mcm. The said components of the pigment are in the following ratio in wt %: iron (III) oxide of the first fraction with plastic structure 3-97, iron (III) oxide of the second fraction with particles of different shapes 97-3.

EFFECT: invention enables to obtain a grey coloured pigment with metallic lustre to red, increases corrosion resistance and wear resistance of the paint coatings, reduces opaqueness and oil absorption.

9 cl, 3 tbl, 3 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

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: 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: 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: chemical industry; metallurgy industry; other industries; methods of production of the high purity ferric oxides.

SUBSTANCE: the invention is pertaining to the method of production of the high purity ferric oxides and may be used in production of the pigments and the catalysts at production of the high purity ferric oxides. The ferric oxides are produced by interaction of the metallic iron made in the form of the microball-shaped particles either the scrap, or the turning chips, which dimensions are such, that the area of their surface per one kg of iron and per one liter of the reaction medium makes more than 0.01 m2 with the being stirred water solution of the carboxylic acid having рКа from 0.5 up to 6 for the first carboxyl and capable to thermolysis in the open air at the temperature of from 200 up to 350°С into carbon dioxide and the water. The ratio between the moles of the carboxylic acid and g-atoms of the iron makes from 0.03 up to 1.5 and the mass ratio of the water/iron - from 1 up to 20, the microball-shaped particles are kept in the suspension by stirring. The produced carboxylate of the ferrum (II) is oxidized up to carboxylate of the ferrum (III) with the oxidant selected from oxygen, the oxygen-containing gaseous mixture and hydrogen dioxide. The earlier produced carboxylate of the ferrum (II) also may be exposed to the oxidizing. Then the carboxylate of the ferrum (III) is heated up in the open air till production of the oxides. The invention allows to increase the purity of the ferric oxides and productivity at their production.

EFFECT: the invention ensures the increased purity of the produced ferric oxides and productivity at their production.

9 cl, 12 ex

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

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2 cl, 5 tbl, 6 ex

FIELD: pigment technologies.

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EFFECT: lowered FeOOH suspension hydrothermal heat treatment temperature and increased pigment preparation productivity.

1 tbl, 12 ex

FIELD: paint-and-varnish industry; construction engineering; painting plastics and leather; production of enamel paints, primers, putties, wall-paper and veneer.

SUBSTANCE: solution of hydraulic washing-out of used melt of titanium chlorates containing ferrous chloride (II) is treated with alkaline reagent to pH= 2.5-4.5 at precipitation of oxyhydrates of metals. Solution is separated from sediment by filtration. Cleaned solution thus obtained is mixed with solution obtained after leaching-out of copper-containing melt of process of cleaning titanium tetrachloride from vanadium compounds by means of copper powder. Ratio of volumes of said solutions is 1 : (0.5-2), respectively. Mixed solution is treated with alkaline reagent to pH= 9-11. Suspension thus obtained is subjected to filtering. Sediment is washed, dried and calcined additionally at temperature of 400-700°C. Proposed method makes it possible to utilize wastes of process of production of titanium dioxide from titanium tetrachloride. Pigment thus obtained has rich black color, reflection coefficient of 3.5±0.5%, hiding power of 4.5±0.5 g/m2 and pH of aqueous suspension of 7.0±0.5.

EFFECT: enhanced efficiency.

2 cl, 1 ex

FIELD: varnish-and-paint industry.

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EFFECT: widened resource of raw materials, utilized converter industry waste, and reduced price of product.

2 cl, 1 tbl, 6 ex

FIELD: metallurgy; building industry; varnish and paint industry.

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EFFECT: the invention allows to simplify process and to upgrade parameters of the pigment.

2 cl, 1 tbl, 1 ex

FIELD: paint-and-varnish industry; construction engineering; painting plastics and leather; production of enamel paints, primers, putties, wall-paper and veneer.

SUBSTANCE: solution of hydraulic washing-out of used melt of titanium chlorates containing ferrous chloride (II) is treated with alkaline reagent to pH= 2.5-4.5 at precipitation of oxyhydrates of metals. Solution is separated from sediment by filtration. Cleaned solution thus obtained is mixed with solution obtained after leaching-out of copper-containing melt of process of cleaning titanium tetrachloride from vanadium compounds by means of copper powder. Ratio of volumes of said solutions is 1 : (0.5-2), respectively. Mixed solution is treated with alkaline reagent to pH= 9-11. Suspension thus obtained is subjected to filtering. Sediment is washed, dried and calcined additionally at temperature of 400-700°C. Proposed method makes it possible to utilize wastes of process of production of titanium dioxide from titanium tetrachloride. Pigment thus obtained has rich black color, reflection coefficient of 3.5±0.5%, hiding power of 4.5±0.5 g/m2 and pH of aqueous suspension of 7.0±0.5.

EFFECT: enhanced efficiency.

2 cl, 1 ex

FIELD: pigment technologies.

SUBSTANCE: invention is intended for use in varnish-and-paint industry and in rubber and plastics production. Red iron oxide pigment preparation comprises: oxidation of aqueous solutions of ferric sulfate or suspensions of ferric hydroxide with air oxygen at quasi stationary temperature and pH values of reaction medium; hydrothermal heat treatment of suspension of ferric oxyhydroxides in periodical or continuous regimes in autoclaves; washing-out of pigment from water-soluble salts; drying and grinding of the pigment. During hydrothermal heat treatment FeOOH suspension is affected by nanosecond electromagnetic pulses having following characteristics: pulse duration 0.5-5 ns, pulse amplitude 4-10 kv, pulse repetition frequency 200-1000 Hz. Process is carried out at 130-200°С.

EFFECT: lowered FeOOH suspension hydrothermal heat treatment temperature and increased pigment preparation productivity.

1 tbl, 12 ex

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

SUBSTANCE: proposed method includes leaching-out of serpentine ore mixture containing magnesium and chromium by sulfuric or hydrochloric acid for obtaining iron-containing solution which is treated with hydrogen peroxide and is neutralized to pH= 7.0-8.0. Suspension thus obtained is filtered and iron hydroxide residue is dissolved with sulfuric or hydrochloric acid, then it is treated with alkaline reagent to pH=2.0-6.0 and is filtered. Then, iron hydroxide residue is washed off water-soluble ions, dried and burnt at temperature of 550-700C.

EFFECT: wide range of tints in processing and decontamination of sulfate and chloride waste obtained at production of periclase and chromite concentrate.

2 cl, 5 tbl, 6 ex

FIELD: chemical industry; metallurgy industry; other industries; methods of production of the high purity ferric oxides.

SUBSTANCE: the invention is pertaining to the method of production of the high purity ferric oxides and may be used in production of the pigments and the catalysts at production of the high purity ferric oxides. The ferric oxides are produced by interaction of the metallic iron made in the form of the microball-shaped particles either the scrap, or the turning chips, which dimensions are such, that the area of their surface per one kg of iron and per one liter of the reaction medium makes more than 0.01 m2 with the being stirred water solution of the carboxylic acid having рКа from 0.5 up to 6 for the first carboxyl and capable to thermolysis in the open air at the temperature of from 200 up to 350°С into carbon dioxide and the water. The ratio between the moles of the carboxylic acid and g-atoms of the iron makes from 0.03 up to 1.5 and the mass ratio of the water/iron - from 1 up to 20, the microball-shaped particles are kept in the suspension by stirring. The produced carboxylate of the ferrum (II) is oxidized up to carboxylate of the ferrum (III) with the oxidant selected from oxygen, the oxygen-containing gaseous mixture and hydrogen dioxide. The earlier produced carboxylate of the ferrum (II) also may be exposed to the oxidizing. Then the carboxylate of the ferrum (III) is heated up in the open air till production of the oxides. The invention allows to increase the purity of the ferric oxides and productivity at their production.

EFFECT: the invention ensures the increased purity of the produced ferric oxides and productivity at their production.

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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