Method for complex processing of serpentinite
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
The invention relates to the field of inorganic chemistry, in particular thermobalancing processing coexisting phases serpentinizing ultrabasic rocks to obtain silicon dioxide, magnesium chloride, pigment, and fine silica that can be used in the synthesis of nanocomposite materials, and special optical glasses, and as a filler in rubber and plastics, silicagel sorbents, catalysts carriers, forming substance in metallurgy, an integral part of the lacquer coating, plastics, linoleum, enamels, high-temperature fire-resistant paints, in the production of fine ceramic and refractory substances as raw materials for silicon, magnesium oxide, etc.
A method of processing serpentinites, which serpentinite calcined in the temperature range of 640-680°C, and then heat-treated serpentine treated at a temperature of 85-95°C for 3-5 min 5-8%solution of hydrochloric acid, when the serpentinite: hydrochloric acid =1:(11-20) wt., the relations. The hot slurry is immediately subjected to decantation and filtered. The result is a solution containing silicic acid, chlorides of magnesium and iron (III), where the average wt., the content of substances, calculated from oxides, %: SiO2- 0.68, MgO - 4.30, Fe2O3- 0.18. The filtrate slurry at a temperature of 0°C is evaporated, and silicic acid Sol-gel is separated and the solution of the chlorides of iron (III) and magnesium neutralized with lime water and at pH=7-7 .5 and 8-10 consistently separate the hydroxides of iron (III) and magnesium. The precipitate formed from desantirovanii mass is dried. He is a fine silica without solids, which has the following chemical composition in %: SiO2- 80, MgO - 12, R2O3- 8 .
The disadvantage of this method is incomplete process associated with incomplete acid due to the lack of closed-loop formation of dilute solutions after processing of serpentinites, the extension of chemical substances and processing methods for the separation of substances that lead to incremental energy and material costs.
The objective of the invention is to provide an environmentally friendly, cost-effective and easy to implement technological scheme of complex processing of serpentinites.
The invention consists in the following: serpentinite calcined in the temperature range 680-750°C, and then calcined serpentine treated at a temperature of 85-95°C for 3-5 min 4-8%solution of hydrochloric acid, when the serpentinite:hydrochloric acid =1:(40-15) wt., relations, receiving at a temperature of 85-95°C. the slurry, in rest the adopted parts of which are the chlorides of magnesium and iron (III), and silicic acid, and the insoluble part is amorphous silica and prosloennaya part of the breed. Then the slurry is decanted to separate amorphous silica from nerazlozhimoi part of the breed, and filtered. The filtrate on average has the following chemical composition calculated from oxides, %: SiO2- 0.72, MgO - 1.85, Fe2About3Is 0.27, which silicic acid is separated by a Sol-gel process, a solution of partially Shustov, and silica - SiO2- 82.95, MgO - 9.28, Fe2About3- 6.97.
After separation and washing of the gel to the solution of the chlorides of magnesium, iron (III) and hydrochloric acid add hydrochloric acid to obtain a 4-8%solution of hydrochloric acid, which again can be used for processing new portion of the heat-treated serpentine. This process is repeated 3-5 times. The final solution is treated by a new portion of the heat-treated serpentine. The result is a solution of magnesium chloride, and the residue, where the remains of the iron hydroxide (III), after processing at a temperature of 350-400°C turns into a red pigment.
Significant differences of the proposed method: over a large temperature range firing serpentinite (680-750°C), which provides a larger outputs the extracted substances, creating a closed cycle with no loss of hydrochloric acid and without the involvement of any other substances, the floor is placed pure solution of magnesium chloride, and red pigment.
Schematic diagram thermobalancing processing coexisting phases of serpentinites is given on the drawing.
The invention was tested in laboratory conditions, Jonha of NAS RA.
Example. Two hours of heat-treated at a temperature of 720°C 20 g of serpentinite and 340 ml of an 8%aqueous solution of hydrochloric acid with a ratio of t:W=1:17, mixing with a stirrer, a hold at a temperature of 90°C for 5 minutes, after which the resulting slurry in a hot condition immediately subjected to decantation and filtering the filtrate was separated from amorphous silica. The filtrate has the following chemical composition calculated from oxides, %: SiO2- 0.77, MgO - 2.12, Fe2About3- 0.36, which silicic acid is separated by a Sol-gel process, Shustov part of the solution. After separation the gel percentage of hydrochloric acid in the solution is reduced to 1.5-2.2%. Again the volume of solution bringing to 340 ml, and the concentration up to 7%, the above process is repeated for the second time. Then, repeating this process is still 2-4 times and each time separating silicic acid Sol-gel, the result is an enriched solution of the chlorides of magnesium and iron (III) with 1-2 .5%hydrochloric acid. This solution has the following chemical composition calculated from oxides, %: MgO - 10.5-11, Fe2About3- 1.2-1.5. The solution is mixed by the mixer is a new portion 20 g of serpentinite within 5 min at a temperature of 90°C, after filtering the slurry receive a clean solution of magnesium chloride. The precipitate, where the remains of the iron hydroxide (III) after processing at a temperature of 350-400°C, turns into a red pigment, in which Fe2About3comes to 15-16%.
Sources of information
1. Patent AM No. 1576 A2, 2005.
The method of complex treatment of serpentinites, in which the calcined serpentine, treated with hydrochloric acid, the hot slurry is decanted and filtered, the precipitate is dried to obtain silica, and the filtrate is evaporated, separated silicic acid Sol-gel, after which the solution containing the chlorides of magnesium and iron (III)is subjected to further processing, characterized in that the first calcined at a temperature of 680-750°C serpentinite handle 4-8%solution of hydrochloric acid at a mass ratio of serpentinite and hydrochloric acid 1:(15-40), and after separation of the silicic acid in the form of a Sol-gel in the solution containing the chlorides of magnesium and iron (III)add hydrochloric acid to obtain a 4-8%solution of hydrochloric acid, which is used for processing of a new portion of serpentinite, then stage decantation, filtration, evaporation of the filtrate, Department of silicic acid in the form of Sol-gel processing of the obtained solution of hydrochloric acid repeat 3-5 times, using the new batch of calcined serpentine, then close nirovany thus the solution at a temperature of 90°C is mixed with serpentinite, filter, separating the solution of magnesium chloride from the precipitate containing iron hydroxide (III), and the precipitate at a temperature of 350-400°C turn in red pigment.
SUBSTANCE: invention refers to procedures for extracting valuable metals from wastes including wastes of refining production. The procedure for processing silver containing lead wastes for extracting silver and lead in form of products consists in leaching wastes with solution containing hydrochloric acid to transit lead into solution and silver to sedimentation. Also leaching is carried out in three stages. At the first stage leaching is peformed with solution of lead chloride (PbCl2) at temperature 0°-25°C in concentrated hydrochloric acid (HCl) by placing wastes in this solution heated to temperature 40°-80°C. Major part of lead transits into solution. During the second and the third stages non-dissolved wastes are leached in 30-42% HCl and successively filtered till pure powder-like silver is produced in a non-soluble residue. Upon the first stage solution is cooled to 0°-25°C, crystals of PbCl2 are extracted out of it and combined with solutions of HCl after leaching at the first and the third stages; a new portion of wastes is directed to leaching. Implementation of this procedure at a lead plant of average output can collect yearly income of approximately 100 million dollars from sale of lead chloride.
EFFECT: raised efficiency of wastes processing, additional economic profit from implementation of this procedure at various metallurgical productions.
4 tbl, 2 ex
SUBSTANCE: invention refers to procedure for leaching precious metal from ore containing said precious metal. The procedure consists of three stages: leaching ore at presence of hydrochloric acid with production of soluble chloride of metal in a solution for leaching, in adding sulphur dioxide into the solution for leaching, in extracting metal sulphate or metal sulphite from the solution for leaching and in regenerating hydrochloric acid. As ore there can be used oxide ore of non-ferrous metal, such as oxide zinc ore, laterite nickel ore, such as saprolite or limonite, sulphide ore or titanium ore. Precious metal is chosen from a group including Zn, Cu, Ti, Al, Cr, Ni, Co, Mn, Fe, Pb, Na, K, Ca, metals of platinum group and gold. Precious metal or less precious metal, such as magnesium, can be a metal in composition of metal sulphate or metal sulphite. Regenerated hydrochloric acid is directed into a re-circulation system in the process of leaching.
EFFECT: increased efficiency of process.
45 cl, 36 dwg, 5 tbl
SUBSTANCE: procedure for processing titanium-magnetite concentrate consists in leaching concentrate with sulphuric acid and heating in presence of metal iron, in transfer of iron and vanadium into leaching solution and in concentrating titanium in residue. Further, solution is evaporated; iron containing residue is extracted and subjected to pyrolysis producing iron oxide and regenerated hydrochloric acid. Titanium containing residue is dried and baked producing a titanium product. Also titanium-magnetite concentrate is leached at concentration of hydrochloric acid of 15-19% and temperature 95-105°C. Iron-vanadium product in form of sediment of iron and vanadium hydroxides is settled from leaching solution by means of processing with ammonia solution at pH 2.4-2.8; there is produced iron chloride solution (II). Produced iron chloride solution is evaporated; iron containing sediment is extracted and the left sediment is subjected to pyrolysis. Titanium containing sediment is baked at temperature 700-800°C.
EFFECT: production of pure iron oxide (Fe2O3 not more than 99,3 wy %).
3 cl, 1 tbl, 6 ex
SUBSTANCE: method involves treatment of the material by washing with water, burning the insoluble residue and leaching the ash. Before leaching, the ash undergoes secondary treatment by washing with water in solid to liquid ratio equal to 1:0.7-2.5.
EFFECT: reduced volume of pulp obtained during leaching, increased extraction of noble metals and recycling of potassium chloride.
2 tbl, 2 ex
SUBSTANCE: invention refers to extraction methods of precious metals and can be used for extraction of precious metals from mineral raw material containing chlorides of alkali and alkali-earth metals, e.g. sludges of potassium production. Extraction method of precious metals from clay-salt waste - sludges of potassium productions - containing chlorides of alkali and alkali-earth metals involves bulk concentrate obtained from them, roasting, leaching of precious metals from stub end and sorption of precious metals. Bulk concentrate is obtained till content of chlorides is 15 to 30%. Before roasting, the concentrate is granulated and subject to roasting at temperature of 500-950°C. Precious metals are leached from stub end by means of salt acid solution.
EFFECT: increasing complex extraction of precious metals.
5 tbl, 4 ex
SUBSTANCE: development method of ruthenium concentrate includes thermal treatment of it in mixture to sodium peroxide in iron pans at mass ratio of sodium peroxide to concentrate (0.8-2.0) and gradual temperature increase up to 500-600°C. Then it is implemented treatment of thermal treatment product in water and dissolving in hydrochloric acid with transferring and concentration of rutenum in chloride solution. After product thermal treatment in water received pulp is treated by deoxidising agent, in the capacity of which it is used Na2SO3 or C2H5OH, up to value achievement of oxidation-reduction potential equal to minus (100-200) mV (relative to chlorine-silver reference electrode). Received sediment is separated up to formed aquatic alkaline solution and subject to dissolving in hydrochloric acid.
EFFECT: achievement of deep development of concentrate with its following concentration in chloride solution with low saline saturation.
1 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: invention relates to processing of Au-Sb antimony-based gold containing alloy. Proposed method comprises dissolving the alloy by hydrochloric acid, extracting antimony oxychloride chloride solution by hydrolysis and gold by sorption. Note here that alloy dissolution is effected by hydrochloric acid with hydrogen oxide solution. Extracted antimony oxychloride is dissolved in dihydroxysuccinic acid and resulted solution is directed to electro hydrolysis to produce cathode antimony. During hydrolysis the solution is regenerated to further use in dissolution. Gold is extracted by sorption from the solution containing 60 to 65 mg/l of gold with the help of high-basic anion exchanger AB-17.
EFFECT: treatment of alloys with wide range of noble metal concentrations within 0,1 to 1,3 %.
7 cl, 4 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: invention relates to process engineering and can be used for processing antimony-based alloys containing noble metals in concentrations over 0.1%. Proposed method comprises dissolving alloys in solution containing acid and extracting noble metals from said solution by cementing. Prior to dissolving alloys, lead is remove therefrom by processing with solvent. Alloys are dissolved by solution containing hydrochloric acid and hydrogen dioxide or sodium persulphate. Noble metals are cemented by antimony-based alloys with minor concentration of noble metals or cathode antimony powder with grain size varying from 100 to 74 mcm, or by gold-antimony flotation concentrate with grain size varying from 100 to 74 mcm to produce an alloy enriched with noble metals cements noble metals. Now, noble metals are extracted from obtained products.
EFFECT: treatment of alloys with wide range of noble metal concentrations within 0,1 to 1,3 %.
4 cl, 2 tbl, 5 ex
SUBSTANCE: invention relates to an area of precious metals metallurgy; in particular to methods of concentrates opening containing platinum-metals (PM) and gold. Method includes pressure leaching of material by solution containing sodium chloride, at temperature 200÷230°C and at partial pressure of oxygen 7-10 ati. Leaching is implemented by solution containing sodium chloride and hydrochloric acid, at consumption of chloride-ion, equal to 1.5÷3.0 g/g of sum of precious metals contained in initial material up to achievement of oxidation-reduction potential of platinum electrode in pulp relative to saturated chlorine-silver electrode equal to 690÷750 mV.
EFFECT: increasing of platinum-metals extraction into solution ensured by opening of thrust minerals, and also in simplification of process of following extraction of rare platinum metals (rhodium, ruthenium and iridium) from received chloride solutions.
2 cl, 1 tbl, 10 ex
SUBSTANCE: final tailings are leached with circulating concentrated hydrochloric acid at boiling temperature of hydrochloric pulp of 103-109°C thereby producing gaseous mixture of water vapours, hydrogen chloride and hydrochloric acid solution containing titanium, vanadium, iron, chromium, manganese and cake. Produced cake is washed and dried; so final product is obtained in form of concentrate of silicon oxide. The following compositions of metals are extracted by selective sedimentation out of obtained hydrochloric acid solution in three stages: titanium hydroxide, hydrated vanadium pentaoxide, mixture of iron and chromium oxides and basic manganese carbonate. Vapour-gas mixture of water and hydrogen chloride formed in each stage of metal composition extraction is condensed producing circulating hydrochloric acid. The acid is used for washing sediments of metal compounds and for leaching of source final tailings.
EFFECT: selective and waste-free extraction of compounds of titanium, vanadium, iron, chromium and manganese out of final tailings and producing commodity products in form of concentrates of titanium dioxide, vanadium pentaoxide, and mixture of iron, chromium and manganese oxides performed in closed process circuit.
1 dwg, 3 tbl
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: 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