Method of processing iron ore to make coloring agent and pellets

FIELD: process engineering.

SUBSTANCE: invention may be used in paint-and-lacquer, pharmaceutical, cosmetic, food and metallurgical industries. Proposed method comprises iron ore crushing, grinding, wet magnetic separation to produce magnetic and nonmagnetic fractions, ultrasound oxidation destruction of nonmagnetic fraction, hydraulic classification, thickening and drying. Stage-by-stage hydraulic classification comprises primary classification and, at least, two cleaner classification. Magnetic fraction and sand of primary classification are pelletised using molasses as binder in amount of 1-5 wt% at moisture of pelletised blend of 8-12%.

EFFECT: iron oxide coloring agents and pelletised raw stock for metallurgy.

2 cl, 3 dwg, 1 ex

 

The invention relates to a method for natural (non-synthetic) iron oxide pigments that can be used in a special anti-corrosion primers used including for the needs of the shipbuilding and the simultaneous achievement of raw materials for the metallurgical industry in the form of briquettes. 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, publ. 20.07.2007). 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.

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

Known way to "Getting the iron sludge micron size class" (patent RU №2354672, publ. 10.05.2009). 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, publ. 10.09.2009). To obtain iron oxide pigment from specularite first are grinding specularite to a particle size greater than 1 mm - 5 mm, then check the appropriate services for the enrichment method of magnetic separation to the content of Fe 2O3more 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 main disadvantages of this method are the low output conditioned pigment from the source of raw materials, the difficulty of obtaining high-quality pigment.

A method of obtaining natural red iron oxide pigment from ore (Kuskov V.B. have been, Kuskov AV "Development of technology for micaceous iron pigments". Metallurgist. No. 3, 2010, p.70-72)adopted for the prototype. Crushed iron ore is subjected to magnetic separation with separation into magnetic and nonmagnetic fractions, non-magnetic fraction was pulverized and classified in 4 stages, including the main classification, the first perekisnoe, the first control and the second control gidrotsiklonirovanija with the Department of Sands primary classification. Then drain subjected to oxidative degradation, concentrated and dried with simultaneous disintegration and air classification of pigment.

The main disadvantage of this method is the impossibility of receiving the Oia several varieties, in particular, high-quality, pigment and a relatively low yield of pigment.

The technical result of the invention is to improve the quality of the finished pigment, empowering way and increase the complexity of application of iron ore.

The technical result is achieved in that in the method of processing of iron ore with production of pigment and briquettes, including iron ore crushing, magnetic separation, grinding nonmagnetic fractions, its hydraulic classification, including primary and one prechistoy classification, ultrasonic oxidative degradation, concentration and drying, the iron ore is first crushed and pulverized, and then subjected to wet magnetic separation, the non-magnetic fraction is subjected to a first ultrasonic oxidative degradation, and then multi-stage hydraulic classification, including the basic classification and at least two roughing classifications for the finished pigment, while the magnetic fraction and Sands main classification with bitteroot use as binders molasses in the amount of 1-5 wt.% when humidity briquetted charge 8-12%.

Magnetic separation and multi-stage hydraulic classification can be carried out in a gravitational-centrifugal-magnetic separator.

Fractional is giving and grinding of iron ore allows to sufficiently disclose intergrowths of minerals for further separation.

Wet magnetic separation allows for the magnetic fraction greater part depigmented" minerals, which have a higher unit magnetic susceptibility than the "pigment" minerals.

The implementation of ultrasonic oxidative degradation for non-magnetic fraction before multi-stage hydraulic classification allows you to remove sulfide minerals from non-magnetic fraction and to improve the quality of the pigment.

Multi-stage hydraulic classification, including the main hydraulic classification and at least two roughing hydraulic classifications, allows to obtain several varieties of pigment, different size and opacity.

Briquetting magnetic fraction and Sands primary classification allows you to expand the capabilities of the method, namely to get completely ready for metallurgical processing and easily transportable cake.

The use of molasses as a binder allows you to get a solid briquettes, and the molasses has a positive effect on the metallurgical process. The amount of molasses is less than 1 wt.% can not get enough of durable briquette, a number greater than 5 wt.% does not increase the strength of the briquette.

Humidity briquetted charge 8-12% provides uniform mixing of all components, the formation of the s ties and a better forming briquettes, which increases their strength. Humidity less than 8% impedes mixing of the components of briquetted mixture, the moisture content of more than 12% of the excess, reduces the formability of the mixture, reduces the strength of the briquettes.

Using gravitational-centrifugal magnetic separator makes it possible to perform magnetic separation and classification in one device that reduces costs, and allows to obtain pigments of several varieties and source material for producing briquettes.

The method is as follows. The scheme of the method is presented in figure 1. Iron ore is first crushed in crushers, ore finely chopped 1 crushed in the mills with 2, and then subjected to wet magnetic separation, wet magnetic separator 3. The magnetic fraction 4 accumulate and use for briquetting. The non-magnetic fraction 5 is subjected to a first ultrasonic oxidative degradation 6, and then multi-stage hydraulic classification, including the basic division 7, and, for example, the first 9, second 16 and third 21 perejitye classification. Draining the main hydraulic classification serves 8 for the first prechistoy hydraulic classification in the cyclone 9. Sands first cleaner cell hydraulic classification 10 return to the main hydraulic classification. The drain of the first cleaner cell hydraulic Klas is eficacia divided into two streams. One of the threads 11 are sent to the thickening 12 and 13 drying with getting the finished pigment third grade 14. Another thread 15 is served on the second prechistoy hydraulic classification hydrocyclone 16 (smaller volume). Sands second cleaner cell hydraulic classification 17 is sent to the first power cleaner cell classification. The drain of the second cleaner cell hydraulic classification is also divided into two streams. One of the threads 18 are sent to the thickening 12 and 13 drying with getting the finished pigment of the second grade 19. Another thread 20 is served on the third prechistoy hydraulic classification hydrocyclone 21 (still smaller). Sands of the third cleaner cell hydraulic classification 22 is sent to the second power cleaner cell classification, and plums 23 condensed 12 and 13 drying, resulting in the finished pigment first grade 24.

The magnetic fraction 4 and Sands primary classification 25 bitteroot 26 with a binder. Binder prepared from molasses 27 by dissolving it in water 28 from the calculation of humidity briquetted charge 8-12%. A solution of molasses 29 mixed with 30 magnetic fraction 4 and Sands primary classification 25 and bitteroot 29. Molasses is used in the amount of 1-5 wt.% when humidity briquetted charge 8-12%. The finished briquettes 31 is used for metallurgical purposes, for example, in the blast furnace process.

As the materials which you can use rich hematite, martite, hydrohematite ore and other iron ore.

Example. Use martite and extracted-hydrogenative iron ore Yakovlevsky mine. The pilot batch of pigment and briquettes of iron ore. The original iron ore, grain size 350-0 mm, crushed in two stages on the hammer crushers to a size of 10 mm, and then ground in a wet ball mill way up to 75% of the class smaller than 40 μm and subjected to wet magnetic separation drum separator. After oxidative destruction in the ultrasonic reactor non-magnetic fraction (yield 87% from the operation of magnetic separation) is subjected to multi-stage hydraulic classificatie in 4 stages. The main classification is carried out in a spiral classifier. First perekisnoe gidrotsiklonirovanija carried out in a cyclone with a diameter of 250 mm, the second perekisnoe gidrotsiklonirovanija, in the hydrocyclone diameter of 160 mm, and the third perekisnoe gidrotsiklonirovanija - 100 mm part of the drain of the first perekisnogo hydrocyclone displayed as a finished product and after thickening paste in the thickener, drying, dust collection was shipped as a finished pigment third grade. Part of the drain of the second perekisnogo gidrotsiklonirovaniya displayed as a finished product and after thickening paste in the thickener, drying, dust collection was shipped as a finished pigment WTO the th grade. The drain of the third perekisnogo gidrotsiklonirovaniya after thickening paste in the thickener, drying, dust collection was shipped as a finished pigment first grade. Output, size and opacity of the resulting pigment is shown in figure 2 and consisted of:

Third grade - output 19-23%, grain size 32-38 μm, opacity 16-20 g/m2;

Second grade - output 14-18%, grain size 18-26 µm opacity 10-12 g/m2;

The first output 10-17%, the particle size of 8-12 microns, opacity 7-9 g/m2.

As gravitational-centrifugal magnetic separator used round rotating liner, equipped with an electromagnetic inductor of the running field. It also received three varieties of pigment:

Third grade - yield of 18.8% with a particle size of 33 μm, the coverage of 18 g/m2;

The second class is the output of 18.7%, particle size of 22 μm, the spreading rate of 11 g/m2;

First grade - exit 19%, the particle size of 9 μm, a spreading rate of 7 g/m2.

Properties of the obtained briquettes is shown in figure 3. The briquettes obtained with the amount of molasses to 0.8 wt.%, had the average uniaxial compressive strength of 4.13 MPa; 1 wt.% - 7.5 MPa; 2 wt.% - 8,5 MPa; 3 wt.% - 10.9 MPa; 4 wt.% and 15.3 MPa; 5 wt.% and 15.3 MPa.

Briquettes were made of size 22×20×18 mm, average weight of about 30 briquettes, the moisture content of the mixture was varied in the range of 8-12%.

Thus, the method expands its capabilities and allows p is a better quality of the finished pigment and provides comprehensive utilization of iron ore.

1. A method of processing iron ore with production of pigment and briquettes, including iron ore crushing, magnetic separation to obtain the magnetic and nonmagnetic fractions, grinding nonmagnetic fractions, its hydraulic classification, including primary and one prechistoy classification, ultrasonic oxidative degradation, concentration and drying, characterized in that the iron ore is first crushed and pulverized, and then subjected to wet magnetic separation, the non-magnetic fraction is subjected to a first ultrasonic oxidative degradation, and then multi-stage hydraulic classification, including the basic classification and at least two roughing classifications for the finished pigment, while the magnetic fraction and main Sands classification bitteroot using as a binder molasses in the amount of 1-5 wt.% when humidity briquetted charge 8-12%.

2. The method according to claim 1, characterized in that the wet magnetic separation and multi-stage hydraulic classification is carried out in a gravitational-centrifugal-magnetic separator.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: metallic iron is produced by loading and heating lumpy material in reduction furnace with moving hearth for reduction of iron oxide contained in lumpy material with the help of carbon-containing reducing agent. Note here that lumpy material is produced by ball milling of the mix of materials containing said material that contains iron oxide, said carbon-containing reducing agent, binder and moisture, and drying mix of materials. Hydrocarbon is used as binder. Mix of materials is cured prior to ball milling for 0.5-4 hours. Note also that binder fraction in said mix makes about 0.5-1.5 wt %.

EFFECT: high mechanical strength, moderate content of binder and moisture.

2 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: mould contains particles of at least one alloy. Also particles of alloy correspond to titanium dioxide and binding material connecting particles of alloy in the mould. Notably, binding material contains organic polymer. Binding material changes its form and releases particles of alloy at heating the mould to specified temperature above 260°C. The mould includes approximately at least 18 % of organic polymer weight. The said moulds completely and uniformly are distributed in melt, which facilitates maintaining carbon contents in melt below allowed maximum, preferably below 0.04 wt % due to contents of from 18 wt % of organic polymer in the moulds, for example copolymer of ethylene and vinyl acetate or polyethylene of low density. Uniform distribution of alloying additives is achieved, for example by usage of moulds of dimension similar to dimension of other source materials added to melt.

EFFECT: uniform distribution of alloying additives.

44 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to pelleting of sulfide molybdenite concentrates granulations before oxidising roasting. Pelleting is implemented with addition of binding component - water solution of corn syrup with consumption of corn syrup, which is 3.0-4.0 kg per 100 kg of molybdenite concentrates. Additionally corn syrup contains 36-44% mono - and disaccharides.

EFFECT: receiving of pellets with strength >300 g/pel with using of organic binding, thoroughly decay during the process of oxidising roasting.

4 tbl, 3 ex

FIELD: ferrous metallurgy, namely production of iron ore pellets.

SUBSTANCE: method comprises steps of feeding charge into lumping apparatus by two flows; introducing first flow into gas flow at creating stream of gas and moistened charge; depositing charge; realizing seed formation; after-lumping seeds by means of second flow of charge; in addition introducing into gas flow organic filament like particles with diameter 0.01 - 1.0 mm and length 2 - 50 mm in quantity 0.1 -4.0% of charge mass. Deposition of charge and after-lumping of seeds are performed simultaneously.

EFFECT: improved strength of iron ore pellets.

1 dwg, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to methods for lumping ground iron-ore raw in aim for it preparing to metallurgic conversion and utilization of iron-containing waste. At least one iron-containing material and a binding agent are mixed, the mixture is subjected for aggregation and prepared aggregates are strengthened. As a binding material method involves using a synthetic copolymer of acrylamide and sodium acrylate wherein the mole part of sodium acrylate can be from 0.5 to 99.5% and molecular mass in the range = (1 x 104)-(2 x 107) Da. Dosing synthetic copolymer of acrylamide and sodium acrylate is from 0.02 to 0.10 kg per a ton of iron-containing material. Copolymer of acrylamide and sodium acrylate can be used as a dry powder, solution, emulsion, suspension or aerosol, in pure state or as a mixture with additional material. Invention provides retaining the maximally high content of iron in lumped material possessing required physical and metallurgic properties, enhancing output of the technological process and creating additional parameters in operation of the lumping process.

EFFECT: improved lumping method.

2 tbl, 2 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: charge comprises iron-ore material, fuel, flux and a binding agent containing organic surface-active substances. Charge comprises catamine as a binding agent. Charge comprises components taken in the following ratio, wt.-%: flux, 5-10; fuel, 5-10; catamine, 0.01-0.03; iron-ore material, the balance. Invention provides enhancing output of blast furnace and to reduce consumption of coke in using the proposed charge. Invention can be used in producing agglomerate in ferrous and nonferrous metallurgy used, in particular, in blast furnace manufacture.

EFFECT: improved and valuable properties of charge.

3 tbl

The invention relates to the metallurgy of ferrous metals, in particular the production of pellets from fluorite concentrates that are added to the slag to reduce its viscosity and removing harmful components in obtaining high-quality steels
The invention relates to the briquettes containing waste silicon, designed for non-ferrous metallurgy, and to methods for their manufacture

The invention relates to the field of preparation of zinc-containing material to the thermal treatment and can be used in metallurgical and chemical industries

FIELD: chemistry.

SUBSTANCE: to obtain iron oxide pigments, iron oxide sludge, which is a water treatment waste, is dried, calcined and ground. The water treatment wastes used are ferruginous underground water with iron content of not less than 42%. Calcination is carried out by gradually heating the dried iron oxide sludge either to temperature of 600°C in order to obtain a chocolate brown pigment, or to temperature of 800°C in order to obtain a bright red pigment, or to temperature of 1050°C in order to obtain a black pigment. Once the required temperature is reached, the calcination device is turned off.

EFFECT: invention enables to recycle wastes of water treatment plants to obtain iron oxide pigments for coloured concrete, paving slabs, prime coats, enamel and paints.

2 cl, 1 dwg, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: anticorrosive pigment is obtained from a mixture of pigment components of oxygen-containing metal compounds. The method of producing pigment involves heat treatment of the mixture and grinding the heat treated product. The anticorrosive pigment is produced from a suspension of its components. The anticorrosive pigment additionally contains a pigment inhibitor-component which is a waste from neutralisation baths of machinery production, with the ratio of components galvanic sludge: inhibitor-component equal to 1:1 (on iron and calcium oxides) based on calcium contained in the galvanic sludge.

EFFECT: obtaining cheap highly resistant anticorrosive pigments with a ferrite structure, obtained from galvanic sludge, and wide field of their use.

2 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: production wastes are dried and ground to the required fineness. The production wastes used are in form of sludge from clarification tanks of thermal power stations formed during liming and coagulation of raw water on a water treatment plant. The sludge is dried at temperature 200-250°C for 3-3.5 hours.

EFFECT: method enables to obtain a cheap inorganic chromatic pigment, reduces the cost of paint materials by simplifying the process of producing the pigment and using readily available and cheap production wastes, which enables to solve the problem of recycling sludge from clarification tanks of thermal power plants.

2 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of high-strength inorganic pigments which can be used to produce paint materials. The method of producing an iron-calcium pigment involves neutralisation of iron-containing spent solutions, containing sulphuric acid, with a calcium-containing reagent with deposition of a precipitate, filtration and drying the precipitate. The iron-containing spent solution used is waste water from abandoned deposits of iron-copper-zinc sulphide ores containing iron (III) sulphate and sulphuric acid. The waste water is neutralised until achieving reaction mixture pH of 4-5.

EFFECT: simple process and recycling of under-waste dump and quarry water from spent complex deposits.

2 cl, 2 ex

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

FIELD: chemistry.

SUBSTANCE: invention can be used to produce magnesium chloride, silica and red pigment. Serpentinite calcined at 680-750°C is treated with 4-8% hydrochloric acid solution with weight ratio of serpentinite to hydrochloric acid equal to 1:(15-40). The hot pulp is then decanted and filtered. The residue is dried to obtain silica, the filtrate is evaporated and silicic acid is separated. After separating silicic acid in form of sol-gel, hydrochloric acid is added to a solution containing magnesium and iron (III) chlorides until 4-8% hydrochloric acid solution is obtained. The obtained hydrochloric acid solution is used to treat a new portion of serpentinite. Further, the decantation, filtration, evaporation of filtrate, separation of silicic acid and treatment of the obtained solution with hydrochloric acid are repeated 3-5 times using new portions of calcined serpentinite. The solution concentrated that way at 90°C is mixed with serpentinite and filtered. Magnesium chloride is separated from the residue which contains iron (III) hydroxide. Said residue is treated at 350-400°C to obtain red pigment.

EFFECT: invention simplifies the processing serpentinite, improves environmental safety and reduces expenses and wastes.

1 dwg, 1 ex

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

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: varnish-and-paint industry.

SUBSTANCE: invention is intended for use in chemical industry and construction for preparing varnishes, paints, and rubber products. Gas treatment slime from converter industry is fractioned, fraction up to 10 mm is dehydrated by drying at 70-110°C to at most 5% moisture content and reduced to particles not exceeding 300 μm in size. Color spectrum of product is extended from red to black by calcining disintegrated product at 300 to 900°C. Content of iron oxides in pigment is much higher than in pigments prepared using known processes.

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.

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

Up!