Method of extraction of vanadium out of after burning waste of sulphuric black oil
SUBSTANCE: invention refers to non-ferrous metallurgy and can be used for extraction of vanadium out of ashes which is waste produced by burning of sulphuric vanadium containing black oil in heat engines of heat and hydropower stations. The method consists in the following: source ashes are mixed with sodium carbonate and water at a weight ratio of 100:(10-60):(30-50), then produced mixture is held at temperature of 100-150°C, preferably 115-120°C, during 2 hours. Vanadium is leached out of produced self-diffusing cake with water at temperature of 95-100° and a ratio of liquid: solid = (1.5-3):1.
EFFECT: avoiding of generating harmful gas exhausts at extraction of vanadium and implementation of available equipment.
1 tbl, 2 ex
The invention relates to the field of non-ferrous metallurgy and can be used for vanadium recovery from waste combustion in thermal power plants and power plant sulfur containing fuel oil.
Currently, due to the lack of rational technology of processing wastes accumulate in sumps CHP, creating a hazard for the environment. Wastes are slime content of V2O5from 0.8 to 20%, consisting mainly of oxides of iron, calcium, silicon, and unburned carbon residue of organic matter.
A known method for processing ash residues CHP in the charge with other vanadium-containing material to obtain vanadium sinter and pellets are used later in ferrous metallurgy for alloying of steel (ed. St. USSR №918322, IPC SW 34/22, publ. 1982). The method is intended for the use of vanadium in the steel industry.
At the same time, for other applications of vanadium is the most interesting getting it in the form of vanadium pentoxide. For the extraction of vanadium in the form of vanadium pentoxide from various solutions used precipitation from solutions of poorly soluble ammonium Vanadate, followed by its decomposition or precipitation from a solution of hydrated vanadium pentoxide V2O5×N2About when the pH of the solution to 1.5-2 with the placenta is brilliant sludge dewatering (Chemistry and technology of rare and scattered elements. Edited by Bolshakova. V.3, M, 1976, str).
The known method of translation of vanadium from ash in solution by processing the ash hydrogen peroxide solution at room or low temperature (application Japan No. 49-32404, IPC SW 55/00, publ. 1974). From the solution after heating and oxidation of the precipitated vanadium in the form pentoxide.
The disadvantage of this method is the use of expensive and easily present and degrades reagent.
A method of processing of volatile ashes containing vanadium, concentrated caustic soda solution which selectively dissolves the vanadium from the ash obtained in the processing of bituminous shale (French patent No. 2187878, IPC SS 3/00, publ. 1974).
This method is quite expensive reagent, in addition, leaching of vanadium from the ash resulting from combustion of fuel oil at TPP, we should expect low extraction of vanadium in the solution, as by leaching with caustic soda the vanadates of calcium and iron from ash CHP incompletely decomposed.
The chemistry of interaction and technical entities closest to the proposed method is a method of processing used to extract vanadium from a variety of products, which consists in sintering vanadium raw material with soda ash (sodium carbonate) at a temperature of 600-800°in an oxidizing atmosphere, followed wimalasiri the m vanadium from SPECA water (U.S. patent No. 3929460, IPC SW 7/04, 34/22, publ. 1975).
The described method of extracting vanadium from vanadium bearing slag, close in composition of vanadium-containing ashes. This method is applied for the selective extraction of vanadium from different products. Depending on the consumption of soda in solution can be removed up to 90% of vanadium. For the implementation of this method requires kiln rotary tube furnace, lined with refractory materials, and the recycling and disposal of generated gas environment.
The need for special high-temperature equipment and additional measures for dust and gasolline hinder the realization of the method in terms of each individual CHP.
There is also known a method of extracting vanadium from vanadium-containing raw material, which is used ashes from TPPs and after mixing them with limestone addition is treated with water at T:W of 1:1.5:10, a temperature of 30-80°C for 10-30 min (RF patent No. 2080403, IPC SW 34/22, publ. 1997).
The task of creating the present invention is to develop an environmentally friendly, are for sale in the ordinary conditions of the method of extracting vanadium from ash, which is the waste of burning sulfur fuel oils using sodium carbonate (soda ash).
The problem is solved in the proposed method, the essence of which the conclusion is is is for the extraction of vanadium from ash, which is the waste of burning sulfur fuel oil, carry out the heat treatment of the mixture of the original ash with sodium carbonate and the subsequent leaching of vanadium from the received SPECA, the original ash is mixed with sodium carbonate and water taken in a weight ratio of 100:(10-60):(30-50), heat treatment of the mixture is carried out at a temperature of 100-150°C for 2 hours, and the leaching of vanadium lead water at a temperature of 95-100°and the ratio of W:T=(1.5 to 3):1.
In terms of the proposed thermal treatment of ash, the gas phase consists mainly of water vapor, which can be easily condensed.
For purification of the gas mixture does not require additional measures.
Using a mixture of water with soda at specified ratios allows you to create a layer of ash, the effect of the concentrated solution at a relatively low consumption of soda. Contact ash particles from the concentrated solution at temperatures of 100-150°provides desorption of vanadium with particles of soot and intensive course of mass transfer processes in diagrams:
Translation of vanadium in soluble form, and calcium and iron in m is lorstadine connection.
The resulting powdery sintered leached with water. To accumulate concentrations of vanadium in solution, the leaching is carried out in dense slurries, when the ratio W:T=(1.5 to 3):1 with a partial or full use of the obtained solutions for leaching fresh servings of cake. Get solutions with a pH of 1.5-2 are heated to the boil. This solution stands out precipitate of hydrated vanadium pentoxide. The decomposition of the initial ash soda solution at relatively low temperatures allows one to obtain pure vanadium pentoxide with the impurity content of less than 2%.
Because of the availability of the method and environmental safety it can be used directly in terms of each TPP or TPP for small installations simple design.
The proposed method was developed in the laboratory and ukrupnennom-laboratory scale. The efficacy of the method is illustrated by examples and results of the experiments presented in the table.
Example 1 (known to the equivalent of U.S. patent No. 3929460).
Hanging of the original ash content V2O5to 11.3% is mixed with soda ash (sodium carbonate) in a weight ratio of 100:20. The mixture is heated in a muffle furnace at a temperature of 800°C for 2 hours with air purge. After cooling, the sintered wire ismalic what is and leached with water at a temperature of 95° C for 1 hour with a ratio of W:T=3:1.
In the solution with the content of V2O5to 27.7 g/l extracted 73,6% V2O5. The output of the cake made up 48.2%, the residual oil content in the cake V2About5- 6,2%.
Example 2 (the proposed method).
Hanging of the original ash content V2O5to 11.3% mixed with sodium carbonate and water in the ratio of 100:20:50. The mixture is heated in a drying Cabinet at a temperature of 120°C for 2 hours when exposed to air. Received hot sintered leached with water at a temperature of 95°C for 1 hour with a ratio of W:T=3:1.
In the solution with the content of V2O528,0 g/l extracted 74,4% V2O5the output of cake to 88.7%. The content of V2O53,26%.
These examples show that the analogue and the proposed method with the same consumption of soda is about the same extraction of vanadium in the solution. The output of cake similar to the one less due to combustion at 800°With the soot particles contained in the ash. As a consequence, the content of V2O5the cake similar to the one higher than the proposed method.
The data in the table show that the proposed method with the consumption of soda 10-60% by weight of the ash provides acceptable extraction of vanadium in the solution. Consumption of soda more than 60% do not provide commercially acceptable growth of extraction is possible vanadium. The water flow rate of 30-50% by weight of the ash is optimal for dissolving soda, introduced into the mixture, and sufficient to maintain the mixture in the wet state during the heat treatment at 100 to 150°C.
Thus, the application of the proposed method allows to convert the vanadium in the solution with the extraction of comparable and slightly higher than for the similar. When this process is carried out at low temperatures, precluding the formation of harmful gas emissions, and using available equipment.
|The results of the leaching of vanadium from ashes CHP after heat treatment of the ash with sodium carbonate in an analog (U.S. patent No. 3929460) and the proposed method.|
|no experience||Heat treatment conditions of the original fly ash (100 g ash)||Conditions leaching received SPECA||The character of the solution after leaching||The cake after leaching||Removing the V2O5in solution, %|
|The flow of Na2CO3,%||The consumption of H2O %||t °C||τ, h||The leach solution W:T||τ, h||Volume (l) 100 g ash with promodag||pH||V2O5, g/l||Output %||V2O5,%|
|2||The proposed method||H2O, 3:1||95||1||0,3||8,9||26,5||91,0||to 3.67||70,4|
|4||40||50||120||2||H2Oh, 3:1||95||1||0,3||the 10.1||28,7||86,5||3,11||76,2|
The method of extracting vanadium from ash, which is the waste of burning sulfur fuel oils, including heat treatment of the mixture of the original ash with sodium carbonate and the subsequent leaching of vanadium water obtained from SPECA, characterized in that the source of the ash is mixed with sodium carbonate and water taken in a weight ratio of 100:(10-60):(30-50), and perform heat treatment of the mixture at a temperature of 100-150°C for 2 h, and the leaching of vanadium water is carried out at a temperature of 95-100°and the ratio of W:T=(1.5 to 3):1.
FIELD: hydrometallurgy, namely methods for extraction of vanadium out of alkali solutions produced after leaching metallurgical slag and other vanadium-containing materials.
SUBSTANCE: method comprises steps of leaching vanadium-containing material for producing vanadium containing solution; extracting vanadium form prepared solution by deposition due to mixing vanadium-containing solution with ammonium persulfate in quantity multiple by 1 - 2 times relative to stoichiometric quantity necessary for generation of ammonium vanadate. Method allows produce chemically pure vanadium product containing more than 99% of V2O5.
EFFECT: enhanced efficiency of vanadium extraction according to simplified technological process, possibility for producing chemically pure vanadium product out of intensified alkali solutions.
FIELD: chemical industry; nuclear power engineering; methods of re-extraction of vanadium from the organic solution containing its salts with the di-2-ethylhexylphosphoric acid.
SUBSTANCE: the invention is pertaining to the method of re-extraction of vanadium from the organic solution containing its salts with the di-2-ethylhexylphosphoric acid. The invention is dealt with the method of the radiochemical reprocessing of the constructional materials of the thermonuclear reactor on the basis of the vanadium-chromium-titanium alloy with the purpose of extraction of vanadium from the organic solutions containing its salts with di-2- ethylhexylphosphoric acid. The re-extraction of vanadium from such solutions is exercised with the help of the nitric acid solutions at the acid concentration of no more than 0.5 mole per liter, containing hydrogen peroxide in amount of no less than 2.5 mole per one mole of vanadium. The technical result of the invention is the decreased duration of the process of the vanadium re-extraction with its simultaneous purification from the rare-earth elements.
EFFECT: the invention ensures the decreased duration of the process of the vanadium re-extraction with its simultaneous purification from the rare-earth elements.
2 tbl, 2 ex
FIELD: non-ferrous metallurgy; methods of extraction of vanadium out of the highly concentrated lime slag.
SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to vanadium metallurgy, namely to the method of extraction of vanadium out of the highly concentrated lime slag providing for the wet milling of the highly concentrated lime slag with production of the pulp, treatment of the slag pulp with the sulfuric acid and its oxidizing burning, the sulfuric-acidic leaching of the burning product with the subsequent settling of vanadium from solution by hydrolysis. The technical result of the invention is the increased output of the extracted vanadium as the commercial product, and also improvement of the production process indices at reprocessing of the highly concentrated lime slag. For gaining the technical result the milled slag pulp is treated with the concentrated sulfuric acid taken in the amount of 30-35 % to the mass of the slag. The oxidizing burning is conducted at the temperature of 700-950°С. The product of the burning is subjected to leaching in the weak-acid solution of the sulfuric acid and conduct vanadium settling from the produced solution.
EFFECT: the invention ensures the increased output of the extracted vanadium as the commercial product, the improved production process indices at reprocessing of the highly concentrated lime slag.
1 tbl, 8 ex
FIELD: petrochemical industry; methods of the selective extraction of molybdenum from the solutions containing molybdenum and vanadium.
SUBSTANCE: the invention is pertaining to the method of the selective extraction of molybdenum from the liquid mixtures, in which molybdenum is present with vanadium at the amount of molybdenum exceeding (200) mg/l. The method includes the following stages: bringing the liquid mixture Ph value to the value less than 3, adding to this solution of the solution of alkaline xanthate at maintaining the molar ratio of molybdenum /alkaline xanthate within the interval from 1/4 up to 1/8 at the constant value of pH by means of addition of the inorganic acid, stirring the mixture and settling the molybdenum present in the mixture. The technical result of the invention is the high product yield at separation of molybdenum and vanadium and simplification of the production process.
EFFECT: the invention ensures the high product yield at separation of molybdenum and vanadium and simplification of the production process.
5 cl, 1 tbl, 3 ex
FIELD: processing vanadium-containing converter slag.
SUBSTANCE: proposed method includes roasting of slag with reaction additive, leaching-out cinder by soda solution for obtaining vanadate solution and separating vanadium oxide from it. At roasting, waste slag of vanadium process is introduced as reaction additive; waste slag contains hematite and manganese oxide at mole ratio of vanadium to manganese equal to 1:1. Roasting is performed at 800-850°C for 3 h; leaching-out is carried out with soda solution at mole ratio of V2O5:Na2CO3 equal to 1:1.2-1.8 including filtration of sodium vanadate solution and flushing the sediment with water. Vanadium and sodium are separated from solution thus obtained by electrochemical treatment in membrane system, sorption or neutralization by sulfuric acid followed by sedimentation of polyvanadium acid salts.
EFFECT: increased extraction of vanadium products; reduction of waste water disposal.
1 dwg, 8 tbl, 8 ex
FIELD: hydrometallurgy, in particular, reprocessing of vanadium-containing slag, may be used for extraction of vanadium and manganese from other vanadium-containing materials.
SUBSTANCE: method involves providing oxidizing roasting without adding of reaction admixtures; leaching calcine with the use of aqueous soda solution for producing of solid residue and solution; processing solution with monobasic alcohol used in an amount of 25-30% by volume and settling with following obtaining of two phases: lower phase exposed to separation, washing and drying processes for obtaining of ready product in the form of sodium vanadates, and upper phase in the form of aqueous alcoholic-soda solution, which is subjected to alcohol distillation process and, thereafter, corrected and returned to calcine leaching stage, while alcohol is returned to the stage of extracting vanadium from soda solution; leaching residual substance remained after soda leaching and containing manganese and residual vanadium by means of aqueous solution of sulfuric acid with pH value of solution being not in the excess of 1.95; subjecting resultant manganese-containing solution to two-staged purifying process for removal of contaminants by settling procedure provided with the use of lime mortar, first stage being provided at pH value of 1.90-1.95 with resulting formation of CaSO4 (gypsum) and second stage being provided at pH value of 7.0 with resulting formation of sediment, which is directed to soda leaching stage for additional extraction of vanadium; directing manganese-containing solution for processing with the use of known processes for producing of commercial manganese dioxide.
EFFECT: increased extent of extracting vanadium and manganese, provision for obtaining of high-quality additional commercial product, and practically totally closed slag processing cycle.
5 cl, 1 dwg
FIELD: hydro metallurgy.
SUBSTANCE: method comprises mixing vanadium-containing soda or other alkali solution with monoatomic alcohol, e.g. ethyl alcohol, to achieve alcohol concentration ≥ 25 vol % and settling the mixture for 2.5-3 min to separate it into two phases: bottom (heavy) and upper (light-weight) phases. The former contains 99% of the total amount of vanadium and the latter concentrated soda. Bottom phase is washed and dried to give sodium vanadate, which may be used either as reagent in melting operation to produce ferrovanadium or processed according to known technologies to produce any other vanadium compound. Alcohol is regenerated by heating mother liquor (upper phase). Mother liquor, after adjusting alkali concentration, is used for leaching next fresh portion of vanadium-containing material, for example metallurgical slag.
EFFECT: simplified process due to reduced number of process operations, increased (by 5%) degree of vanadium recovery, enabled regeneration of single reagent, and improved environmental condition.
2 cl, 2 tbl
FIELD: vanadium metallurgy, in particular reprocessing of complex vanadium-, manganese-, calcium-containing raw material.
SUBSTANCE: invention relates to stable vanadium recovery into solution by substantially full leaching of acid soluble vanadium, obtained by burning, in one step, due to adding of oxalate-ions in pulp. To obtain wastewater with low vanadium concentration after vanadium pentoxide hydrolytic precipitation, prehydrolitic solutions are treated with alkaline earth metal hydroxide, and/or carbonate, and/or oxide at pH 3.6-4.9 and agitation for 20-60 min. Treatment may be carried out in pulp up to complete leaching using both clean alkaline earth metal compounds and natural materials or waste products containing mixture thereof. Method is useful in reprocessing of complex raw material, in particular converter dross calcined with sodium- and calcium-containing additives.
EFFECT: method for vanadium recovery with improved stability.
3 cl, 5 tbl, 9 ex
SUBSTANCE: method for pile loosening by blasting in heap leaching (HP) of ores is used to intensify the HP process due to performing drilling-and-blasting works. The method for pile loosening by blasting in heap leaching of ores, whereby a pad is formed by protective drainage 14 and damp-proof layers 15 made of polymeric film, consists in drilling boreholes 2, placing low-density explosive charges into the boreholes 2 and blasting of said charges. The boreholes 2 are drilled to the depth of the protective and drainage layer 14, charges 9 and 12 are distributedly disposed in the boreholes 2. Pieces 13 and 11 of an expanded material, e.g., foamed polystyrene, are placed respectively in the lower part of the borehole and between the charges. The charges are blasted with time delaying beginning from the top charge 9 to the bottom one 12.
EFFECT: increase in the efficiency of ore loosening; prevention of damage of the anti-seepage polymeric film membrane and of penetration of the toxic solution into ground waters.
SUBSTANCE: said utility invention relates to the field of noble metal metallurgy, in particular, to methods of recovery of osmium from non-ferrous metallurgy platinum-containing electrolytic slime processing products, namely, cakes containing selenium and non-ferrous metals. The cake is subjected to preliminary caustic treatment with caustic soda solution with a concentration of 180-220 g/dm3, and the residual matter resulting from the separation is heated at a temperature of 100 to 130°C. The heated residual matter is subjected to treatment with sulphuric acid and secondary caustic treatment. The osmium concentrate resulting from the caustic treatment is sent for the distillation of the osmium tetraoxide, with its recovery using ammonia solution and subsequent preparation of osmium salt.
EFFECT: increase in efficiency and maximum simplification of osmium recovery process.
4 cl, 3 dwg, 1 tbl, 11 ex
FIELD: hydrometallurgy and mining industry; ecological methods of extraction of metals.
SUBSTANCE: proposed method of extraction of metals from solid metal-containing materials or ores includes treatment or underground leaching-out with solution of reagent obtained by electrolysis treatment of solution containing halogenide-anion and separation of metal from this solution. Electrolysis treatment is carried out under condition of positive mass transfer on revolving electrode or on electrode moving at acceleration of no less than 0.1 m/s. After electrolysis treatment, water-soluble polymer used as surfactant is introduced into reagent solution in the amount of no less than 0.01%.
EFFECT: enhanced efficiency and ecological safety due to reduced power requirements, intensification of process, avoidance of toxic emissions and use of safe chemicals.
7 cl, 2 dwg, 6 ex
FIELD: hydrometallurgy of extraction of non-ferrous, rare-earth and noble metals from rebellious raw materials containing natural carbon or other rebellious compounds.
SUBSTANCE: proposed method includes treatment of rebellious carbon-containing mineral raw material by oxygen-containing oxidant followed by extraction of noble metal compounds from liquid phase. Treatment of carbon-containing mineral raw material by oxygen-containing oxidant is carried out in presence of reductants possessing donor-acceptor properties which are expressed in the fact that at first stage of chemical reactions, reductants give off their electrons to oxygen-containing oxidant, forming stronger oxidant as compared with first one in form of short-lived radicals and intermediate products of oxidation of donor-acceptor reductants which are also used as oxidants.
EFFECT: increased extraction of non-ferrous, rare-earth and noble metals; low cost of process.
FIELD: non-ferrous metallurgy; pressure hydrometallurgy and processing of oxidized silicate nickel ores enriched with magnesium.
SUBSTANCE: proposed method includes sulfidizing stage and oxidizing stage with the use of elemental sulfur at the sulfidizing stage in form of aqueous suspension and oxygen at the oxidizing stage. At the sulfidizing stage, use is made of solution of sulfates with bivalent cation and surfactant which facilitates hydrophilization of elemental sulfur; surfactant is fed to suspension at grinding the sulfur which makes it possible to perform both stages of pressure leaching at temperature below 200°C and total pressure in autoclave below 2.0 Mpa, thus ensuring high extraction of nickel into solution up to 93-97%.
EFFECT: considerable reduction of pressure leaching temperature and total pressure in autoclave at high extraction of nickel into solution.
2 cl, 4 ex
FIELD: leaching extraction of non-ferrous and precious metals from refractory ores by cyaniding process.
SUBSTANCE: method involves cyclical or continuous leaching of metal from ore-containing pulp; supersonic processing; collecting and processing pregnant solution; providing supersonic processing at cyclical leaching after first leaching process and at continuous leaching - before first leaching process by exposing to supersonic field having intensity of 1-70x104 W/m2 in hydrodynamic generator and simultaneously feeding air. Method allows efficiency of metal extraction process to be increased due to fundamental changing of supersonic process parameters, in particular, supersonic field intensity, increased concentration of solved and dispersed gaseous oxygen and products of acoustic-chemical reactions in pulp, and additional grinding of ore grain.
EFFECT: increased efficiency of process and reduced labor intensity due to the fact that generator functions in self-oscillating operational mode and does not need additional works, and simplified process.
FIELD: technology of processing uranium-and fluorine-containing wastes.
SUBSTANCE: proposed method includes preparation of solutions from wastes, concentration of solutions by sedimentation of uranium followed by dissolving of sediments in nitric acid, extraction conversion of concentrated solutions with the use of tributyl phosphate in hydrocarbon thinner and sedimentation of ammonium polyuranates from re-extracts thus obtained. Sedimentation of uranium at stage of concentration is performed with the use of sodium hydroxide at pH= 9-10 and temperature of 60-90C. Proposed method enhances purification of uranium from fluorine due to enhanced sedimentation and filtration properties of sediments at concentration stage. Content of admixtures in triuranium octa-oxide powders obtained from re-extracts by sedimentation of ammonium polyuranates and subsequent calcination does not exceed specified norms.
EFFECT: enhanced efficiency.
1 dwg, 2 tbl, 1 ex
FIELD: ferrous and precious metallurgy, in particular, processes for extraction of precious metals from affinage production wastes.
SUBSTANCE: method involves leaching out material containing precious metals and lead with the use of sulfuric acid solution having concentration of 150-300 g/l; subjecting sulfuric acid leaching cake to leaching out in sodium chloride solution without addition of sulfuric acid. Method allows lead to be more completely extracted from processing circuit.
EFFECT: provision for producing of stable lead-containing solutions, and improved quality of platinum metal concentrates.
1 tbl, 7 ex
FIELD: extraction of non-ferrous, rare-earth, radiactive and noble metals by spraying ore stack with leaching solutions.
SUBSTANCE: proposed method includes crushing and nodulizing of ore, filling of stack and spraying of ore stack with leaching solution. After crushing, ore is divided into fractions and filling of stack is performed with layers which are homogeneous in fractions at reduction of size or ore from lower layer to upper one. Besides that, filling the ore stack is performed from center to side surfaces of stack by layers at separation of layers with perforated polymer film. Wide part of stack is oriented to South. Spraying the ore stack with leaching solution is performed under water- and solution-tight light-transmitting film; in winter seasons artificial heat insulator is placed over film.
EFFECT: enhanced efficiency of leaching due to increased rate of leaching and reduction of negative effect of sedimentation in ore stack; reduced effluents of toxic agents.
3 cl, 2 dwg
FIELD: mining art; geo-technological methods of extraction of minerals; treatment of ores by leaching.
SUBSTANCE: proposed method includes saturation of ore crushed beforehand with solution followed by collection and discharge of productive solution for reworking. Crushed ore is flooded and/or washed with water activated with plasma, after which plasma-activated water is discharged and filtered and leaching solution is prepared on its base for flooding and/or washing the ore; then, leaching reaction is conducted after which leaching solution is discharged, filtered and concentration of beneficial components contained in this solution is measured; if necessary, some more leaching cycles are performed with the use of leaching solution of previous cycle till required concentration of beneficial components has been obtained. Leaching solution used for realization of this method contains plasma-activated water, reagent-solvent, pH corrector at the following ratio per 1000 kg: reagent-solvent, 1-5 kg; pH corrector, 0-2 kg; the remainder being plasma-activated water; cyanide or chlorine, or iodine, or bromine, or thiosulfate is used as reagent-solvent; lime or caustic soda is used as pH corrector.
EFFECT: reduced power requirements; low cost of reagents; enhanced efficiency.
3 cl, 4 ex
SUBSTANCE: invention refers to metallurgy of rare metals, particularly to methods of processing of hard uncovered concentrates specifically to leucoxenic concentrates produced at dressing of oil bearing siliceous titanium ores of Yaregsky deposit and used for further production of artificial rutile. The method includes sintering of float concentrate at presence of additives, cooling, crumbling and dressing by way of separation of titanium oxide grains from silicates either by physic-chemical and/or mechanical methods. Prior to sintering oil titanium leucoxenic float concentrate is mixed with fuel sorption active additives for their saturation with oil from float concentrate. Sintering is performed by means of filtration burning under the mode of superadiabatic heating in a shaft type reactor. At that oil titanium float concentrate is charged into the reactor from the top together with inert additives, while from the bottom oxygen containing gas-oxidiser is supplied into the reactor by counterflow. Float concentrate is being charged at its successive flow through the heating and drying zones, through pyrolysis zone, burning and cooling zones and is discharged; while oxygen containing gas-oxidiser is supplied during the flow through these zones at inverted sequence; this gas takes part in the processes of burning and interacts with components of the concentrate producing at the final stage gas-product which consists of water steam released during drying and products of oil burning. As inert additives, recycled hard modifying additives in kind of refractory materials are used. The temperature of sintering in the burning zone is maintained within the range of 900-1300°C by means of regulating mass fractions of burning and non-burning materials charged into the reactor and oxygen supplied with gas-oxidiser.
EFFECT: upgraded chemical activity (treatability) of concentrate, increased contents of rutile phase in concentrate, increased profitability of the process.
4 cl, 1 dwg, 1 tbl