A method of obtaining a red micaceous iron pigment
(57) Abstract:Usage: the pigmentation of paints, phosphors, plastics, chemical fibers. The inventive from mine waters containing iron (II) with a pH of 1.5 to 3.5 allocate zhelezookisnye bacteria. Mine water is passed through a reactor filled with an inert fiber. The number of bacteria - 109- 1010cells per 1 g of inert fibers. Through the reactor at 15 - 50oC bubbled air into the number of R/min, where P is the volume of the reactor. The obtained hydroxide iron (III) thermoablative in an autoclave at 180 - 260oC or in air at 500 - 1000oC. the Pigment is washed, dried and milled. The pigment has a color ranging from orange to red-brown, the hiding power 4 - 8 g/m2the dispersibility of 15 to 20 microns, an oil absorption of 20 to 25 g/100 g pigment. 2 C. p. F.-ly, 2 tab. The invention relates to the recycling of iron-containing waste to produce pigments used for the pigmentation of paints, phosphors red glow, plastics, chemical fiber, paper, tiles and other materials.A method of obtaining red micaceous iron pigment, comprising the oxidation of a solution, steriade the soba are using the solution, containing iron (II) with a high concentration, the presence of harmful effluents.The objective of the invention is to obtain high-quality pigment using a dilute solution containing iron (II).This is achieved in that in the method of obtaining the red micaceous iron pigment, comprising the oxidation of a solution containing iron (II) heat treatment of the resulting sludge, washing, drying and grinding the obtained pigment according to the invention as specified solution using dilute solution with a pH of 1.5 to 3.5, in particular mine water before oxidation allot of them zhelezookisnye bacteria, and 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 a temperature of 15 - 50oC and aeration of the specified solution with a flow rate of air, equal to P/min, where P is the volume of the reactor. Heat treatment of sludge are under hydrothermal conditions at 180 - 260oC or in air at 500 - 1000oC. depending on the heat treatment temperature get red pigments of various hues.The optimal number of bacteria is determined by the completeness and wrentit slower and not until the end, and the increase in the number of bacteria above 1010cells per gram of fiber is almost impossible.The boundary values of the temperature oxidation are related to the fact that at temperatures below 15oC the length of the process is increased considerably, and above the 50oC stops the activity of bacteria.Air consumption less than P/min significantly increases the oxidation and increase it is unfeasible since the time of oxidation decreases slightly.Reducing the temperature of hydrothermal treatment below 180oC allows the initiator to translate amorphous precipitate of iron (III) in the pigment, and at temperatures above 260oC deteriorates color pigments due to the increase in the average size of the particles, and the pigment gets brown. Heat treatment in air atmosphere at a temperature below 500oC leads to the deterioration of the color pigment and oil absorption, and at temperatures above 1000oC the pigment particles are sintered, and worse of all quality parameters of pigment.Example 1. Mine water with a temperature of 20oC from waste copper mines containing 1.8 g/l Fe2+, 0.3 g/l Fe3+, 90 mg/l Cu2+150 mg/l Zn10cells/g of fiber. Through the reactor was barbotirovany the air of one volume to the volume of the reactor per minute. After 2 h, the concentration of Fe3+the solution was 2.1 g/l, Fe2+less 0,007 g/l Hydroxide iron (III) resulting from the oxidation of iron (II) was placed in an autoclave and subjected to processing at 220oC. In the hydrothermal treatment was formed iron oxide pigment properties.Other examples (2-17) similar to the first and different parameters of oxidation, which are listed in the table. 1. Qualitative indicators of pigments depending on the conditions of heat treatment are given in table. 2.Presented in table. 1 and 2 examples, the invention allows to obtain red micaceous iron pigments of different colors, not inferior in quality indicators known micaceous iron pigments, it uses simple technology, recycled waste mine water. 1. The method of obtaining micaceous iron pigment, comprising the oxidation of a solution containing iron (II) heat treatment of the resulting sludge, washing, drying and grinding the obtained pigment, characterized in that as a solution containing deleltoubasa bacteria, and 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 fiber, 15 - 50oWith and aeration of the specified solution with air flow rate equal to R/min, where P is the volume of the reactor.2. The method according to p. 1, characterized in that the heat-treated sludge are under hydrothermal conditions at 180 - 260oC.3. The method according to p. 1, characterized in that the heat treatment are in the air atmosphere at 500 - 1000oC.
FIELD: chemical industry and agriculture; production of hydrosol of ferric iron hydroxide.
SUBSTANCE: the invention is intended for a chemical industry, an agriculture and pedology and may be used at production of solutions for soils reclamation. 0.5 l of a ferric chloride solution with concentration of 0.5 l/mole gram-molecule is poured into a pan. Carbon electrodes are put into the solution. Pass a current of 1А. Each 5-60 seconds polarity of the electrodes is changed. In a result of replacement of anions of the salt for ions of the hydroxyl obtain a stable hydrosol of the ferric iron hydroxide. The invention allows to produce such sols using a simple and a production-friendly method commercially.
EFFECT: the invention allows to produce such sols using a simple and a production-friendly method commercially.
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.
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FIELD: chemical industry; mechanical engineering; etching and galvanic production branches; methods of production of the magnetic liquids.
SUBSTANCE: the invention is pertaining to the field of production of the magnetic liquids from the wastes of the etching and galvanic productions. The invention problem is production of the magnetic liquids on the basis of the water using the waste etching solution of the engineering plants as the source of the bivalent iron and the sediment-waste after purification of the waste waters of the galvanic manufacture by electrocoagulation - as the source for production of the trivalent iron. The problem is settled due to the fact, that the method provides for co-sedimentation of the salts of the bivalent and trivalent iron by the surplus of the ammonia concentrated solution, coating of the surface of the particles with the adsorbed layer of the stabilizing substance - sodium oleate, heating of the suspension and bringing it up to boiling at the constant hashing, centrifuging of the mixture after its cooling for separation of the large- dispersed particles be notable for the fact, that as salts of the bivalent and trivalent iron using the mixture of the waste etching solution of the engineering plants containing FeSO4 and the muriatic sediment-waste containing Fe(OH)3 in the ratio of 2:3 after purification of the sewage of the galvanic production by electrocoagulation.
EFFECT: the invention ensures production of the magnetic liquids on the basis of the water using the waste etching solution of the engineering plants as the source of the bivalent iron and the sediment-waste after purification of the waste waters of the galvanic manufacture by electrocoagulation - as the source for production of the trivalent iron.
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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: method of sulphide minerals oxidation includes feeding of pulp with sulphide minerals and oxidising agent into reactor with following its blending and outlet of oxidised composition from reactor. During blending of pulp and oxidising agent in internal chamber of reactor in turbulent conditions it is implemented mechanical activation of surface of solid phase of pulp and disperse of oxidising agent. Outlet of oxidised compositions from internal chamber into external chamber of reactor is implemented under action of pressure created by inlet flow of pulp through openings overlapped in top part of internal chamber by regulator of pulp outlet. Additionally liquid phase of pulp is continuously circulates from external chamber into internal chamber of reactor. Oxidation rate of sulphide minerals is regulated by means of changing of oxidising agent concentration in pulp ensured b changing of its amount form 3000 up to 15000 mg·l/h at activation of pulp in reactor.
EFFECT: invention provides reduction of sulphur content in treatment products of mineral raw material directed to following enrichment or metallurgical redistribution, increasing of reactor productivity.
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