Iron oxide based pigment

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

 

The invention relates to the production of pigments and can be used to obtain pigments and their further application in various industries, in particular in the manufacture of paints, building materials, ceramic materials, glasses, enamels, plastics, plastics, rubber and other Components of the pigment composed of iron oxide produced from material of the same class but with different particle size and different structure, which is the most distinctive feature of the invention.

Know the use of iron oxide system F2O3as micaceous iron pigments. These pigments are used for coloring plastics, linoleum, used in the manufacture of building materials, a variety of paints, enamels, etc.

Known pigment (Patent SU # 1033517, class C09D 1/24. Appl. 1981.04.29 application No. 3291750/23-26. Publ. 1983.08.07). This pigment contains the following components, wt.%: iron oxide 63,0-88,0; silicon oxide 0,7-6,0; aluminum oxide from 0.6 to 5.1; calcium oxide 1,7-3,0; magnesium oxide 3,8-4,0; oxides of sodium and potassium 2,3-4,0; manganese oxide 0,4-0,9; zinc oxide 2,5-14,0.

However, this pigment has a narrow color gamut, requires a large number of components from different kinds of substances have a narrow scope.

Known composition to obtain a red zhelezotsinkovogo is egment (Patent SU # 1656857, class SS 1/22. Appl. 1989.09.25 application No. 4759635/26. Publ. 1994.09.15). This pigment contains the following components, wt.%: iron oxide 60,0-98,0; zinc oxide 1,0-15,0; aluminum oxide is 0.1-25,0.

However, this pigment has only one color, requires a different kind of substances.

Known pigment based on silica and iron oxide system F2O3(Patent RU № 2218371, class SS 1/24, SS 1/28, SS 3/06. Appl. 1999.03.10 application No. 2001127434/15. Publ. 2003.12.10). This pigment is composed of silica and iron oxide in the following ratio, wt.%:

Silica70-98
Iron oxide2-30

However, this pigment has a narrow color range. In addition, it requires hard the resulting material is silica.

Closest to the proposed invention is a brown iron oxide pigment based on iron oxide (II) and (III) (Patent SU # 1154300, class SS 1/24. Appl. 1983.04.25, application No. 3583369/23-26. Publ. 1985.05.07). This pigment consists of aluminum oxide, magnesium oxide, calcium oxide, iron oxides in the following ratio, wt.%:

aluminium oxide31.10-36.90
0,26-0,30
of calcium oxide0,09-0,11,
iron oxidesrest

However, this pigment is designed to produce only one color, has a high oil absorption, requires for components consisting of different kinds of substances.

The technical result of the invention is:

- expand the scope of cheap iron oxide pigments;

in obtaining the pigment of one substance;

in obtaining the pigment, in which the second component can be obtained from the first component by mechanical grinding;

- to increase the color gamut pigment gray color with a metallic Shine to red;

in obtaining the pigment that perform different functions: anti-corrosion, protective and decorative functions filler;

The present invention relates to a pigment based on iron oxide (III), including iron oxide (III), containing two fractions, the first fraction of iron oxide (III) has a lamellar structure with a particle size of not less than 20 μm, the second fraction of iron oxide (III) has any structure with a particle size of not more than 20 μm in the following ratio, wt.%:

iron oxide (III) the first fraction
lamellar structure3-97
the iron oxide of the second fraction (III)
of particles of different shapes97-3

The present invention relates to the aforementioned pigment based on iron oxide (III), iron oxide (III) can be made of natural iron oxide (III) by means of mechanical preparation or iron oxide (III) artificial origin. The present invention also relates to the above-mentioned pigment based on iron oxide (III), iron oxide (III) can be used specularite.

The present invention also relates to the above-mentioned pigment based on iron oxide (III), iron oxide (III) can be used specularite Deposit Ore Log.

The present invention also relates to the above-mentioned pigment based on iron oxide (III), where the second fraction of iron oxide (III) can be used first fraction of iron oxide (III), mechanically crushed to the size of the second fraction.

The present invention also relates to the above-mentioned pigment-based OK the IDA iron (III), which may optionally contain a coloring pigment in an amount of 0.5-5.0 wt.%. The present invention also relates to the above-mentioned pigment based on iron oxide (III), iron oxide (III) may contain the size of the particles of the first fraction of iron oxide (III) is preferably not more than 100 μm, more preferably 40 to 70 μm at a mass ratio of the first fraction to the second fraction (1.5 to 3):1. This ratio settings pigment has better anti-corrosion properties.

The present invention also relates to the above-mentioned pigment based on iron oxide (III), iron oxide (III) may contain the size of the particles of the first fraction of iron oxide (III) not less than 100 μm, preferably not less than 150 μm, more preferably not less than 200 μm, when the mass ratio of the first fraction to the second fraction (10-30):1. This ratio settings pigment has the best protective and decorative properties.

The present invention also concerns the application of the above-mentioned pigment based on iron oxide (III) individually or in a mixture with other materials as a component in formulations of paints and varnishes, ceramics, enamels, glass, cements, plastics, building materials, rubber, printing ink and/or separately or in mixture with other materials for finishing painted on top of the awning, surfaces of ceramic materials, enamels, glass, metals, cements, plastics, building materials, rubber, printing ink.

Particles of iron oxide (III) the second fraction may have any structure, i.e. the structure of the particles of the second fraction is not critical for obtaining the above-mentioned technical result.

To prepare the pigment based on iron oxide (III) comes in two flavors:

- as a single component, consisting of mixed first and second fractions of iron oxide (III);

- in the form of two component compositions containing, respectively, the first and second fractions of iron oxide (III).

Supply pigment in two versions due to the requirements of the final product and the production technology. For example, if in the process is the operation of small milling components, which can disrupt the lamellar structure of the first fraction of iron oxide (III), which is required for protective and decorative materials, you should choose the second option supplies pigment. In this case, the second fraction of iron oxide (III) will be introduced to the operations of milling, and the first fraction of iron oxide (III) will be introduced after the milling operation, i.e. at the end of the process.

To improve properties of a pigment based on iron oxide (III) the first and/Rivera fraction of iron oxide (III) can be processed for example, surface-active substances (surfactants).

The first fraction of iron oxide (III) lamellar structure has a gray color with a metallic sheen. The second fraction of iron oxide (III) is a powder of a red color, consisting of particles of different shapes.

To expand the color range and color change pigment based on iron oxide (III) in the first and/or second fraction of iron oxide (III) may be added in a small amount of pigments, such as metal powder pigments (bronze powder, aluminum powder (silver powder), an alloy of copper with zinc and tin (gold powder) and others), organic dyes and inorganic pigments.

The resulting pigment can have a range of colors from gray with metallic luster to red.

The specified pigment is distinguished by the possibility of obtaining a material of the same class in different sizes and patterns that provides a variety of colors and a wide range of applications. In addition, if there is only one major first fraction of iron oxide (III) there is a possibility of using grinding to obtain a second fraction, and to create the claimed pigment. The claimed pigment has an oil absorption is lower than in the prototype, which makes the coating based on it more durable and richer.

To prepare pigme the TA oxide iron (III) as a source of iron oxide (III) use natural or artificially derived iron oxide (III) or salts and/or complexes of iron, which can be subjected to oxidation and/or decomposition during the firing process with the aim of obtaining iron oxide (III). In addition, as a source of iron oxide (III) can be used, for example, natural or synthetic iron oxide which is subjected to mechanical grinding to obtain the required dimensions. As the iron sludge derived from natural specularite, can be used oxide one of the brands specularite or mixtures thereof:

and brand Miox company Kärntner Montanindustrie (Austria)containing Fe2O385-94%, Al2O3- 2-3%, MgO - 1-2%, Sa - 0,3%, SiO2- 3-6%, Pb < 0.1%;

b) brand Nubifer firm "Nubiola" (Spain)containing Fe2O389 - 94%, Al2O3to 1.9%, MgO Of 0.1%, Ca - 0,4%, SiO2- 4,2%, K2O 0,2%.

in) Altai Deposit Ore Log" containing oxides of silicon, aluminum, magnesium and calcium, respectively, not more than 2.5 - 32,5; 1,8; 0,2; 0,3%.

Example 1. Iron oxide (III) a first fraction with a particle size of 40 μm to 3 wt.% from specularite brand Nubifer, iron oxide (III) the second fraction with a particle size of 10 μm 97% wt.% from specularite Deposit Ore Log.

Example 2. Iron oxide (III) a first fraction with a particle size of 65 μm to 50 wt.% from specularite Deposit Ore Log", iron oxide (III) the second fraction with a particle size of 5 μm to 50% wt.% from specularite brand Miox.

The use of the 3. Iron oxide (III) a first fraction with a particle size of 200 μm 97 wt.% from specularite Deposit Ore Log", iron oxide (III) the second fraction with a particle size of 15 μm to 3% wt.% brand Nubifer.

The results of the tests for coverage, absorption and color are shown in table 1.

For coverage, you can judge the ink capacity of the obtained pigments.

The oil absorption characterizes the ability of a pigment to absorb the oil. The lower the oil absorption of the pigment, the more resistant and durable out of the coating. The comparative results show the advantages offered by the pigment in comparison with the known prototype of absorption and opacity.

Table 1.
Example 1Example 2Example 3Prototype No. 1154300
Rate, g/m24,5-5,1of 8.3 and 9.1of 16.5 and 17.913,0-20,3
The oil absorption, g/100 g pigment16-1711-11,516,5-17, 0mm40,0-45,0
ColorRedGrey-red with a metallic sheenGray with metallic lusterBrown

The protective properties of the proposed pigment was estimated on the basis of comparative tests of primer GF-021 standard recipe (option 1) and with the use of the pigment of the following parameters: iron oxide (III) a first fraction with a particle size of 40 μm to 3 wt.%, iron oxide (III) the second fraction with a particle size of 10 μm 97% wt.% (option 2). The results are given in table 2.

Table 2
Name of indicatorOption 1Option 2
The hardness of the film by pendulum device M-3, sm. units0,3470,500
The resistance of film to the effects of salt fog, hours, not less than120240
The strength of the film to abrasion quartz sand (kg/mm)0,6080,769

Anticorrosive its the tion was assessed by exposure to the salt spray on paint, in the composition of which is known zhelezookisnye pigment on TO-166-05011907-88 and offer a pigment.

Table 3 presents the results of tests of paints based on alkyd resin brand AF-033 THE 2311-025-54651722-2002, recipes that as a pigment was used:

- iron oxide pigment THAT 2322-166-05011907-88 (option a)

- iron oxide (III) of the first fraction from specularite Deposit Ore Log" with an average particle size of 70 microns, iron oxide (III) the second fraction from specularite Deposit Ore Log" with an average particle size of 15 μm at a ratio of 2.2:1 (option b);

- iron oxide (III) of the first fraction from specularite brand Nubifer with an average particle size of 63 μm, iron oxide (III) the second fraction from specularite Deposit Ore Log" with a particle size of 10 μm at a ratio of 1.5:1 (option).

Table 3
The name of the parameterOption a)Option b)Option)
The resistance of film to the effects of salt fog, hours, not less than120600600
Resistance to abrasion abrasive, skurk the th (beats. weight wear), g/m215,811,210,8

From the above comparison shows that the values of the masking characteristics of the claimed pigment: oil absorption and coverage is better than prototype. In addition, the paint containing the claimed pigment has a higher corrosion resistance and abrasion resistance than paint containing a known iron oxide pigment according to THE 2322-166-05011907-88.

Thus, the test results show that the proposed pigments provide effective protection of surfaces against abrasion and reliable corrosion protection of metal surfaces and surpass the prototype of absorption, ukryvistosti and the color spectrum.

The pigment based on iron oxide (III) can be used as anticorrosive pigment, protective and decorative pigment, used as filler, as well as various materials such as paint, ceramic, construction, consisting of enamels, glasses, cements, plastics, rubber, printing inks and finishing the surfaces of ceramic materials, enamels, glasses, cements, plastics, building materials, rubber, printing ink.

The pigment based on iron oxide (III) can be used, then what of skovyh paints, latex and organic primers, paints, enamels. As a binder in paint and varnish materials can be used acrylic, vinyl, kremnijorganicheskie and epoxy, alkyd, unsaturated polyester, melamine polymers, cellulose polymers, fluorinated polymers, polyamides, polyuretane, polyacrylates, aminos, polyphenols, etc., These substances can be used both independently and in combination.

The claimed pigment may be mixed with the above resin in ratios of from 1:1.2 to 1:3,5.

As additives in the coating composition together with the claimed pigment can be introduced by means of regulating the viscosity, effective flowing property, sedimentation, promoters of structure formation, panonychus agents, plasticizers, preservatives, antifungicide means, the influence of ultraviolet radiation stabilizers, fillers, etc.

The claimed pigment can be used in paint and varnish materials as filler according to claim 1 of the claims. The declared content of filler in the total amount of filler in paint and varnish materials can range from 100% to 0.5%.

In the relevant number of offer pigment may be used in inks for different printing: high, deep, flat, print Grafsky way offset printing, digital, engraving, etc.

We offer pigment can be used in the production process of polymer materials by direct mixing with the polymer, and after their preliminary granulation. As the plastic component can be used thermoplastic polymers.

We offer pigment may be used in the manufacture of building materials such as concrete, cement, paving tiles, cement tiles, polymer-sand tile, etc. Colored building materials can be obtained by directly mixing them in a solution or painting surface after hardening.

We offer pigment can be used for colouring ceramic, metal and glass. Dyeing can be conducted by adding a pigment directly in raw materials and by surface staining products.

The claimed pigment gives the product superior mechanical strength, chemical resistance, provides good adhesion to the substrate, resistance to light, chalking, wash.

1. The pigment based on iron oxide containing iron oxide (III), characterized in that it contains two fractions of iron oxide (III), with the first fraction of iron oxide (III) has a lamellar structure with a particle size of not less than 20 MK is, the second fraction of iron oxide (III) consists of particles of different shape with a particle size of not more than 20 μm in the following ratio, wt.%:

iron oxide (III) the first fraction
lamellar structure3-97
iron oxide (III) the second fraction
of particles of different shapes97-3

2. The pigment based on iron oxide according to claim 1, characterized in that the iron oxide (III) is made of natural iron oxide (III) by means of mechanical preparation or iron oxide (III) artificial origin.

3. The pigment based on iron oxide according to claim 1, characterized in that as iron oxide (III) is used specularite.

4. The pigment based on iron oxide according to claim 1, characterized in that as iron oxide (III) is used specularite Deposit Ore Log.

5. The pigment based on iron oxide according to claim 1, characterized in that the second fraction, the first fraction, mechanically crushed to the size of the second fraction.

6. The pigment based on iron oxide according to claim 1, in which the first fraction of iron oxide (III) preferably contains is it a particle size of not more than 100 μm, more preferably 40-70 μm, when the mass ratio of iron oxide (III) of the first fraction to the iron oxide (III) the second fraction, wt.% (1.5 to 3):1.

7. The pigment based on iron oxide according to claim 1, in which the first fraction of iron oxide (III) contains a particle size of not less than 100 μm, preferably not less than 150 μm, more preferably not less than 200 μm, with a ratio of iron oxide (III) of the first fraction to the iron oxide of the second fraction (III) (10-30):1.

8. The pigment based on iron oxide according to claim 1, characterized in that it further contains a coloring pigment in an amount of 0.5-5.0 wt.%.

9. The use of a pigment based on iron oxide according to any one of claims 1 to 7 separately or in mixture with other materials as a component in formulations of paints and varnishes, ceramics, enamels, glass, cements, plastics, building materials, rubber, printing inks, and/or separately, or in a mixture with other materials for finishing painted surfaces, surfaces of ceramic materials, enamels, glass, metals, cements, plastics, building materials, rubber, printing ink.



 

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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 %.

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8 cl, 2 tbl, 5 ex

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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.

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15 cl

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1 tbl

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

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9 cl, 12 ex

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2 cl, 5 tbl, 6 ex

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1 tbl, 12 ex

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2 cl, 1 ex

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2 cl, 1 tbl, 1 ex

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2 cl, 1 tbl, 6 ex

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22 cl, 1 dwg

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17 cl, 4 dwg

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: this invention refers to production and application of sorbents. Offered is preparation method of composition for phosphate adsorption, including the stages as follows: a) base addition to aqueous solution containing ferric (III) sulphate and/or nitrate salt solution to deposit ferric hydroxide, b) optional water flush of produced deposit to produce aqueous suspension of ferric hydroxide, c) addition to produced aqueous suspension of component inhibiting deposit ageing ferric hydroxide produced in the stage b), d) drying of composition produced at the stage.

EFFECT: production of phosphate adsorbent with lowered chlorine content of for oral and parenteral preparations for human or animals.

23 cl, 5 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: 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: metallurgy; building industry; varnish and paint industry.

SUBSTANCE: the invention is pertaining to the field of metallurgy, building industry, varnish and paint industry, in particular, to the method of production of a red ferrioxide pigment. A ball mill is charged with industrial water, loaded with iron oxide with concentration of 500-900 g/dm3, poured with a neutralizing agent in the amount ensuring pH 6 ÷ 10. The iron oxide is formed at a thermal decomposition of the hydrochloride solutions used at etching treatment of carbon steels. As a neutralizing agent it is possible to use caustic soda, a slaked lime, microcalcite. The suspension is pulped for 3-5 hours, put in a reactor with a stirrer, where it is washed out with formation of a suspension, filtered off and dried. The target product has the following parameters: pH 5 ÷ 8; the share of water-soluble salts - 0.02-0.03 %; dispersing ability - 27-30 microns; hiding power - 6 ÷7 g/m2. The invention allows to simplify process and to upgrade parameters of the pigment.

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

2 cl, 1 tbl, 1 ex

The invention relates to the processing of oxygen-containing compounds of iron for experimental and industrial production of hydrogen, oxygen, or both separately

The invention relates to the field of paints and varnishes based on synthetic binders, used in obtaining protective coatings

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

SUBSTANCE: the invention is pertaining to the field of metallurgy, building industry, varnish and paint industry, in particular, to the method of production of a red ferrioxide pigment. A ball mill is charged with industrial water, loaded with iron oxide with concentration of 500-900 g/dm3, poured with a neutralizing agent in the amount ensuring pH 6 ÷ 10. The iron oxide is formed at a thermal decomposition of the hydrochloride solutions used at etching treatment of carbon steels. As a neutralizing agent it is possible to use caustic soda, a slaked lime, microcalcite. The suspension is pulped for 3-5 hours, put in a reactor with a stirrer, where it is washed out with formation of a suspension, filtered off and dried. The target product has the following parameters: pH 5 ÷ 8; the share of water-soluble salts - 0.02-0.03 %; dispersing ability - 27-30 microns; hiding power - 6 ÷7 g/m2. The invention allows to simplify process and to upgrade parameters of the pigment.

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

2 cl, 1 tbl, 1 ex

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