A method of obtaining a red micaceous iron pigment with specified electrokinetic characteristics
(57) Abstract:Use: preparation of paints. The essence of the invention: preparing a suspension of red micaceous iron pigment, add 0.25 to 1.5 wt.% polyphosphate sodium in terms of P2O5in relation to the pigment or solution of sulfuric acid to a pH of 1.7 and 2.1, treatment of the latter is carried out at 90-100°C for 1-2 hours Get the pigments with a negative value of Zeta-potential, do not have isoelectric points in the pH range of 2 13. The degree of fixing of the pigment in the material with the desired electrokinetic characteristics - 80-97%. table 2. The invention relates to inorganic pigments used for pigmentation of various materials, in particular phosphors red glow. It is known that the pH value of the isoelectric point (IEP) of the pigments depends on the terms of their treatment and can characterize the dispersion of pigments in various binders, as well as rheological and spectroscopic properties of materials. Pigments with acidic or basic properties of well-dispersed in binders with opposite properties, which improves the quality of the coatings.A known method according to the t modification with inorganic compounds of magnesium, zinc, aluminum, lanthanum, etc. leading to change the pH of isoelectric point above 7 
The disadvantage of this method is that this trick only allows you to shift the pH value of the isoelectric point (IEP) of a pigment in the 6 units in the alkaline region (pH 2.5 to pH 8-11).The invention allows to synthesize red micaceous iron pigmet without IEE in the area of values 2<pH<13 and Zeta-potential which has a negative value, which allows to increase the degree of fixing of the pigment in the material with the desired electrokinetic characteristics. This pigment to the greatest degree must satisfy the pigmentation of phosphors red glow on the basis of oxysulfide or yttrium oxide, the particles of which do not have IEP in the specified range of pH values, but with Zeta-potential, which is in the positive area.The aim is achieved in that in the method of obtaining the red micaceous iron pigment with specified electrokinetic characteristics, including the preparation of its suspension and handling its inorganic substance, as the latter use a solution of sodium polyphosphate in an amount of 0.25 to 1.5 wt. in point lead at pH 1.7 to 2.1 and a temperature of 90-100aboutC for 1-2 hIn the prepared suspension of the pigment is iron oxide is injected quantity of sulfuric acid required to create the values of pH, equal to 2.1 and 1.7, and the suspension is incubated at a temperature of 90-100aboutC for 1-2 h, depending on the concentration of the pigment in suspension.The lower and upper limits of pH values is due to the fact that at pH < 1.7 pigment begins to dissolve, and at pH > 2,1 not achieved the desired effect because it is connected with the dissolution-precipitation of iron (III) at pH 1.5 and pH 2.3, respectively (see, for example, Hornowski I. T. and other Quick reference for chemistry. Kiev: Naukova Dumka, 1974, S. 352).The lower limit on temperature is due to the fact that at a temperature of less than 90aboutthe technical result is not achieved even for a time exceeding 5 hours, the Upper limit on temperature is due to the boiling point of suspension of the pigment under normal conditions.Extract the pigment suspension at the same temperature for less than 1 h (pigment concentration of 100 g/DM3) and 2 h (at a concentration of 200 g/DM3also does not give the desired effect, i.e., the pigment has an IEP at pH 3.0.Increasing time of heat treatment for more than 1 h for Pervov the persons receiving micaceous iron pigment without IEP is the pigment suspension is treated with sodium polyphosphate in an amount of 0.25 to 1.5 wt. in terms of R2ABOUT5with respect to the iron oxide. The lower limit of the concentration of sodium polyphosphate due to the value of the specific surface of the pigment (Sbeats60 m2/cm3for phosphors, and the top no further increase in Zeta-potential, i.e., when the amount of sodium polyphosphate by weight less than 0.25. in terms of R2ABOUT5with respect to the pigment is not sufficient to give the required surface properties (discharge) to the pigment particles, and when the amount of sodium polyphosphate in terms of P2ABOUT5more than 1.5 wt. the surface of the pigment particles already formed and its further increase does not affect the charge of the particles.The influence of sulfuric acid and sodium polyphosphate on the charge of the pigment particles due to the fact that the anions SO42-and RHO42-are sorbed on the surface of the pigment particles, giving them a negative charge.P R I m e R 1. In a suspension of red micaceous iron pigment concentration in the pigment 200 g/DM3enter sulfuric acid portions to achieve a pH equal to 2. The suspension is maintained at a temperature of 90-100aboutis the rd pH appropriate IEP and the degree of fixing of the pigment in its treatment of the suspension with a solution of H2SO4.P R I m e R 10. In the willing suspension of red micaceous iron pigment washed from soluble salts, the concentration of 200 g/DM3with stirring, enter 0.5. polyphosphate sodium in terms of P2ABOUT5with respect to the pigment. Get a stable suspension of pigment, no IEP in the range 2 < pH<13.Presented in table.1 and 2 data shows that the invention allows to obtain pigments with a negative value of Zeta-potential, do not have isoelectric points in the range 2<pH<13. This allows to increase the degree of fixation of pigments to 80-97% on materials with known electrokinetic characteristics (plastic, paper, chemical fiber, phosphors, and so on). A method of OBTAINING a RED micaceous iron PIGMENT WITH SPECIFIED ELECTROKINETIC CHARACTERISTICS, including the preparation of its suspension and handling its inorganic substance, is great for the household characteristics, as the inorganic substances used solution of sodium polyphosphate in an amount of 0.25 to 1.5 wt. in terms of P2O5in relation to the pigment or solution of sulfuric acid and the treatment of the latter is carried out at a pH of 1.7 to 2.1 and a temperature of 90 - 100oWith in 1-2 hours
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
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
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.
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: 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: 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