Method of producing iron-calcium pigment
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
The invention relates to the production of highly resistant inorganic pigments that can be used for the manufacture of paints and varnishes, as well as decoration of building ceramics.
Known pigment and its production method [RF Patent №2118973, CL C09C 1/00, C09C 1/02, C09C 1/24, publ. 20.09.1998], including oxides of iron, calcium, aluminium, copper, zinc, Nickel, silicon, chromium, magnesium, cadmium, lead and fine aluminum or iron as a reductant in the following ratio, wt.%: iron oxide 37,0-64,0; calcium oxide 14,8-21,4; aluminum oxide of 0.02-9,7; copper oxide is 0.5-8,4; zinc oxide 0.3 to 6,45; Nickel oxide is 0.01-4,3; the silicon oxide of 0.02-5,1; chromium oxide 2,1-12,8; magnesium oxide 3,2-4,5; cadmium oxide of 0.2-0.3; lead oxide of 0.1-0.2 and the reducing agent 0.5 to 4.5. The pigment of this composition is obtained by mixing sludge electrochemical and chemical treatment of wastewater of electroplating in the ratio of 25-50:70,5-49,5 respectively, by adding to the mixture of reducing agent, stirring the mixture, and the first heat treatment at 80-110°C and then at 600-800°C and grinding the dried product. For chemical precipitation of wastewater of electroplating using calcium hydroxide. The method allows to get cheap pimento from galvanostatic.
The disadvantage of this method is a significant presence in the target product oxides of heavy the metals, such as copper, Nickel, cadmium and lead, which lead to lower quality pigment and are environmentally hazardous components.
A method of obtaining red micaceous iron pigment [RF Patent №2110479, CL C01G 49/02, C01G 49/06, C09C 1/24, publ. 10.05.1998], including the oxidation of a solution containing iron (II)heat treatment of the resulting sludge, washing, drying and grinding the obtained pigment, and as a solution containing iron (II)use of dilute mine water with a pH of 1.5 to 3.5, before oxidation of him emit zhelezookisnye bacteria, the oxidation is carried out in the reactor filled with an inert fiber in the presence of these bacteria, taken in the quantity of 109-1010cells per 1 g of inert fibers, at 15-50°C and aeration of the specified solution. When heat-treated under hydrothermal conditions at 180-260°C the precipitate, consisting of hydroxide of iron (III), formed pigment properties. The course of annealing is carried out at 500-1000°C. the Method allows to dispose of mine waste water.
The disadvantage of this method is the complexity of the process, due to the necessity of carrying out the oxidation process, separation and immobilization Glazovskaya bacteria.
A method of obtaining gelatomaltitolo pigment [RF Patent №2013428, CL SS 1/24, publ. 30.05.1994], including prigot the pressure suspension embryos by oxidation of a solution of sulphate of iron (II) with oxygen in the presence of lime milk suspension at pH level of 3.5-4.5 at a temperature of 25-40°C, heating the resulting suspension to 75-100°C., filtering and drying the obtained precipitate. The supply of milk of lime carry out portions, and the oxidation of the ferric sulfate solution (II) is conducted at a degree of precipitation of ferric sulfate 15-20 wt.%. The oxidation process are for 4-6 hours.
The disadvantages of the method are the complexity of the process due to the necessary stage of oxidation, the duration of the process of obtaining a pigment.
A method of obtaining iron - and calcium-containing pigment [A.S. USSR №1433960, CL SS 1/24, publ. 30.10.1988] from mine waters copper-pyrite deposits after separation from them of copper, including the neutralization of the mine water with lime, filtering, drying the obtained slurry, grinding and calcining the precipitate at a temperature of 400-500°C. the neutralization of lime water is conducted to a pH of 7-8, and the obtained slurry of the following composition, wt.%: the iron hydroxide 22,63-23,52; aluminium hydroxide to 12.44-15,61; calcium sulfate 57,0-62,5, silicon dioxide 1,29-1,51; magnesium hydroxide 0,09-0,13; hydroxide minerals 1,83-2,25, before drying stand under water for a period of 1-5 years for its complete oxidation. Get pigment orange color with a content of iron hydroxide 25,0-26.3% and having the following parameters: opacity 10-15 g/m2the oil absorption 20-25 g/100 g, bulk density 850-920 g/l
The disadvantage of this method is the difficulty about the ECCA associated with exposure of the sludge under water for 1-5 years.
The closest technical solution is known a method of obtaining a red gelatomaltitolo pigment [RF Patent №2061008, CL SS 1/24, publ. 27.05.1996], including the neutralization of the calcium reagent ferrous waste solutions containing sulfuric acid, the oxidation of the sludge with oxygen from the air, filtering the suspension, washing the precipitate, drying, calcining the precipitate, whereas the calcium-containing reagent is used lime neutralization of the solution with lime lead to pH 6,0-7,0 obtained suspension is filtered, the precipitate washed with water to within 3.0 to 3.5 h and after a short drying the precipitated hydrate of iron oxide calcined at 750-800°C for 1 h as iron-containing waste solutions containing sulfuric acid, used waste etching solutions of iron. The oxidation of iron sulfate (II) FeSO4provide oxygen by bubbling air for 1-2 h in the reaction mixture after neutralization.
The disadvantage of this method is the complexity of the process because of the need for oxidation steps and the duration of the process of obtaining a pigment.
The objective of the invention is to simplify the process.
This object is achieved in that in a method of producing glands of the calcium pigment, including the neutralization of the calcium reagent ferrous waste solutions containing sulfuric acid, filtering, drying and calcining the precipitate, where the iron-containing waste solution using waste water waste deposits of iron-copper-zinc sulfide ores containing iron sulfate (III) and sulfuric acid, and neutralization of wastewater is carried out to achieve a pH of the reaction mixture 4-5. As calcium neutralizing reagent is used chalk, limestone or marble.
The technical result consists in the fact that in the proposed method of obtaining gelatomaltitolo pigment as a source of iron-containing solution using waste water waste deposits of iron-copper-zinc sulphide ores, which contain oxidized form of iron in the form of compounds of iron sulfate (III), and sulfuric acid. Waste water waste deposits represent career and wastedump water, have a pH factor of 1.5 to 2.5, containing sulphate of iron (III) up to 40 g/l and sulfuric acid to 10 g/l, they also contain the sulfates of copper, zinc, manganese, Nickel, cobalt, lead and cadmium in small quantities (from 0.01 to 30 mg/l). When using wastewater specified structure eliminates the stage of oxidation of the resulting sludge.
When carrying out the neutralization in the proposed interval of the pH of the reaction mixture (4 to 5) degree of selection in the precipitate of iron hydroxide (III) is not less than 99.9%, and connection impurities of copper, zinc, manganese, Nickel and cobalt remain to the liquid phase and do not contaminate the target product.
By reducing the pH of the reaction mixture is less than 4 decreases the degree of selection of the target product, and worsen its pigment properties. The increase in pH of the reaction mixture over 5 leads to contamination of the target product impurities of non-ferrous metals.
As calcium neutralizing reagent is used substances consisting of calcium carbonate, such as chalk, limestone or marble. The neutralization process is carried out at a stirring for 15-30 min at room temperature.
The use of sewage waste deposits of iron-copper-zinc sulfide ore as a raw material source for gelatomaltitolo pigment provides a simplification of the process by eliminating the stage of oxidation, adese the separation of the target product.
Example 1. To obtain a pigment use waste wastedump waste water deposits of iron-copper-zinc sulfide ores Kul-Yurt-Tau (the Republic of Bashkortostan, Baimak district)containing 35,7 g/l of ferric sulfate (III), Fe2(SO4)3, 9.5 g/l of sulfuric acid, H2SO4, 29 mg/l of compounds of manganese in terms of metal, 26 mg/l copper, 12 mg/l zinc, 12 mg/l cobalt, 1.2 mg/l Nickel. The pH of the original waste water of 2.1. To 1000 ml of waste water with stirring, add limestone to achieve a pH of the reaction mixture of 4.5. Consumption of limestone 37 g, the reaction mixture is stirred for 15-30 min at room temperature. In the sediment is allocated hydroxide iron (III) sulfate and calcium. The degree of selection of iron (III) in the sediment of 99.96%. The resulting suspension is filtered, the precipitate after a short drying annealed at a temperature of 650°C. Receive 68,7 g yellow gelatomaltitolo pigment containing 28% Fe(OH)3and 72% CaSO4. The filtrate containing the dissolved (as sulfates) admixture of compounds of manganese, copper, zinc, cobalt, Nickel and cadmium, are sent for further processing. The residual content of sulphate of iron (III) in the filtrate amounts to 14.1 mg/l Pigment obtained by the proposed method, has a hiding power 22-35 g/m2, oil absorption 36-40 g/100g pigment. Samples n the basis of the obtained pigment yellow-brown oil paint brand MA-22 on quality meet the requirements of normative documents.
Example 2. Take the waste of quarry waste water deposits of iron-copper-zinc sulfide ores Kul-Yurt-Tau (the Republic of Bashkortostan, Baimak district)containing 1.3 g/l of ferric sulfate (III), 2.1 g/l of sulfuric acid (H2SO4, 4,6 mg/l of compounds of manganese, calculated on the metal, 2.5 mg/l copper, 3.2 mg/l zinc, 0.7 mg/l cobalt, 0,24 mg/l Nickel. The pH of the original waste water of 3.0. To 1000 ml of waste water with stirring, add limestone to achieve a pH of the reaction mixture of 4.5. Consumption of limestone 4 d, the reaction mixture is stirred for 15-30 min at room temperature. In the sediment is allocated hydroxide iron (III) sulfate and calcium. The degree of selection of iron (III) in the sediment of 99.9%. The resulting suspension is filtered, the precipitate after a short drying annealed at a temperature of 650°C. Obtain 4.9 g of a yellow gelatomaltitolo pigment containing 11% Fe(OH)3and 86% CaSO4. The filtrate containing the dissolved (as sulfates) admixture of compounds of manganese, copper, zinc, cobalt, Nickel and cadmium, are sent for further processing. The residual content of sulphate of iron (III) in the filtrate is 11,2 mg/l Pigment obtained by the proposed method, has a hiding power of 30-35 g/m2, oil absorption 36-40 g/100 g of pigment.
1. The method of obtaining gelatomaltitolo pigment comprising neutralizing artisterium reagent ferrous waste solutions, containing sulfuric acid, with sedimentation, filtration, drying and calcination of the precipitate, characterized in that as the iron-containing waste solution using waste water waste deposits of iron-copper-zinc sulfide ores containing iron sulfate (III) and sulfuric acid, neutralization of wastewater is carried out to achieve a pH of the reaction mixture 4-5.
2. The method according to claim 1, characterized in that as the calcium-containing reagent is used chalk, limestone, marble.
SUBSTANCE: invention relates to a method of producing an anticorrosion pigment containing iron phosphate. The method involves adding phosphoric acid solution to iron (II) sulphate solution and neutralising the obtained solution with a product containing amine groups. Neutralisation is carried out until pH 5.5-8 is achieved and a precipitate is obtained. The precipitate is then filtered, washed and dried. The product containing amine groups used is polyethylene polyamine and the precipitate is dried at 50-65°C.
EFFECT: improved anticorrosion properties of the pigment and low production cost thereof.
1 tbl, 3 ex
FIELD: process engineering.
SUBSTANCE: invention relates to hydrometallurgy of copper and nickel and may be used for processing sulphate solutions of copper and nickel. Proposed method comprises nickel sulphate crystallisation. Note here that, prior to crystallisation, solution is processed by ammonia water to pH of 4-4.5 at not over 60°C. Nickel sulphate double salt is subjected to isohydric crystallisation with reaction volume cooling to 15-25°C and separation of crystallised double salt from amorphous phase of appropriate component and mother solution. Said separation is carried out in upflow at variable hydrodynamic conditions created by mother solution at its linear rate of 6-8 m/h.
EFFECT: simplified process, decrease fire hazard.
2 cl, 1 tbl, 4 ex
SUBSTANCE: method involves treatment of the sulphide concentrate with aqueous ammonia solution and with hydrogen peroxide solution after heating to obtain a solution containing rhenium and platinum. After treating the sulphide concentrate, an insoluble residue and the obtained solution which contains rhenium and platinum are separated, treated with sulphuric acid to pH 0.0-1.0. The solution is then heated and held and the formed residue of platinum compounds is separated from the rhenium solution.
EFFECT: possibility of separating platinum and rhenium at the step for extracting rhenium from sulphide concentrate.
1 tbl, 1 ex
SUBSTANCE: method involves simultaneous extraction of platinum and rhenium from acid solutions by introducing to the solution of sulphur-containing reducing agent (sodium thiosulfate). Then, deposit of sulphides and other connections of rhenium and platinum is separated from the solution. At that, sodium thiosulfate is added in the form of water solution by its uniform continuous supply to hot acid solution containing platinum and rhenium at the ratio of masses of reagent and soluble rhenium and platinum of 15 to 23.
EFFECT: reducing the flow of sulphur-containing reagent and increasing the extraction degree of platinum from acid solution to the concentrate owing to changing the procedure of introducing the precipitator reagent to acid solution containing platinum and rhenium.
1 tbl, 1 ex
SUBSTANCE: invention relates to a method of preparing iron-containing coagulant from spent chloride and sulphate etching solutions of steel rolling mills, and can be used in ecology and water treatment. The method of preparing iron-containing coagulant involves oxidation of iron (II) to iron (III) with sodium hypochlorite as an oxidising agent. Concentrated solutions of the coagulant are obtained by oxidising spent etching solutions containing iron (II) sulphate and chloride. The obtained suspension is treated with mineral acid until the precipitate dissolves. The oxidation process takes place at room temperature.
EFFECT: method simplifies and improves the process of recycling spent etching solutions, and reduces formation of by-products which pollute the environment; method enables to include all types of iron-containing spent etching solutions into the recycling cycle.
2 tbl, 4 ex
SUBSTANCE: procedure for production of palladium soluble in nitric acid consists in reduction of suspension of powder of palladium compound. As palladium compound (II) there is used trans-di-ammine-chloride of palladium (II). Reduction is carried out at 50-110°C with addition of 20-50 % water solution of sodium formate or 20-70 % water solution of ammonia formate, acidulous with concentrated formic acid to value of pH 3-5 heated to 50-110°C and taken at amount of 110-150 % from mole amount of palladium. Reduction is performed at presence of ice acetic acid or its concentrated 70-100 % water solution taken at amount of 200-400 % of mole amount of palladium.
EFFECT: stability and simplicity of production of palladium practically completely soluble in nitric acid.
2 tbl, 1 ex
SUBSTANCE: procedure for production of palladium soluble in nitric acid consists in reduction of water solution of palladium compound. As source water solution of palladium compound there is used hydrochloric acid water solution of tetra-chlorine-palladium acid evaporated to the beginning of palladium chloride crystallisation (II). Reduction is carried out at 50-110°C with addition of 20-50 % water solution of sodium formate or 20-70 % water solution of ammonia formate, or 70-95 % water solution of formic acid heated to 50-110°C and taken at amount of 110-150 % from mole amount of palladium. Also, reduction is realised when acidity of solution reaches pH 3-5 with addition of 5-15 % of water solution of ammonia.
EFFECT: stability and simplicity of palladium production.
2 cl, 3 tbl, 1 ex
SUBSTANCE: method involves depositing citric acid from a nitrate solution at temperature 50-90°C and washing the obtained precipitate with water. The precipitate is dried after washing. Bismuth citrate is deposited from the nitrate solution which contains lead and silver impurities, with molar ratio of citric acid to bismuth equal to 0.90-0.99.
EFFECT: high degree of extracting citric acid into the end product and its purity.
1 tbl, 3 ex
SUBSTANCE: procedure for extraction of hydrochloric acid solutions consists in sedimentation of rubidium and in crystallising sediment in form of rubidium hexa-chlorid-tellurite. Sedimentation from hydrochloric solutions is performed with normality of hydrochloric acid within the range 6-12 n with solid tellurium dioxide. The process is carried out at 20-25°C with mixing during 3 hours.
EFFECT: improved separation and increased degree of rubidium extraction.
1 tbl, 1 ex
SUBSTANCE: invention refers to hydro-metallurgy of non-ferrous metals, particularly to procedures of extracting arsenic from solutions and can be implemented for extracting arsenic from sewage of metallurgical, chemical and other branches of industry and also at production of metals from secondary raw materials. The procedure for extracting arsenic from solutions containing a row of metals consists in sedimentation of arsenic in form of arsenate by adding compounds of iron. For sedimentation there are used compounds of iron modified with cation surface active substance (SAS) of nano-crystals of akaganeite β-Fe3+O(OH) in the nano-structure range within limits from 2.12 to 2.34 nm and at pH 6-8. Arsenates are settled from solutions of arcenic ions concentration equal to 0.5-1.0 mg/l. Crystals of akaganeite modified with cation surface active substance are produced by means of sorption of cation surface active substance - hexyldecyl trimethyl ammonia bromide (HDTMBr) on akaganeite, osmosis on a membrane M 45 and sublimation drying at room temperature.
EFFECT: reduced expenditures and raised efficiency of arsenic extraction.
3 cl, 3 dwg, 1 tbl
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
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
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.
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
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
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
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
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.
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.
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: 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