RU74635U1 - PRODUCTION COMPLEX OF TECHNOLOGICAL EQUIPMENT FOR PROCESSING AND DISPOSAL OF WASTE OF TITANIUM-MAGNESIUM PRODUCTION - Google Patents

Abstract

The proposed utility model relates to the field of metallurgy, and in particular to technological equipment used in non-ferrous metallurgy for the complex processing, neutralization and decontamination of complex multicomponent polymetallic production wastes. The developed technical solution can be specifically used in the titanium-magnesium production for the neutralization of chloride melts formed at various stages, sections and compartments for the production of titanium metal - a titanium sponge - by the magnetothermic treatment of titanium tetrachloride and in the electrolytic production of magnesium metal from carnallite raw materials and magnesium chloride . The objective of the proposed utility model is the creation of a new “Production Complex”, which ensures the disposal of almost all salt waste, including secondary production waste generated during the production of metallic titanium (titanium sponge) and metallic magnesium. The technical result that can be obtained by implementing the proposed utility model is an additional release, based on waste management, of carnallite raw materials used directly in the general technological chain for producing titanium and magnesium. The problem is solved with the achievement of the above technical result by the proposed utility model - “Production complex of technological equipment for processing and disposal of titanium-magnesium production wastes”, including a hydro-removal bath connected to a hydraulic sump, a collection tank of initial chloride solutions and pulps connected through a pump to

a water removal bath and a precipitating reactor, a collection tank for vanadium-containing wastewater connected to a collection tank for the initial chloride solutions and pulps, metering tanks for a high molecular weight flocculant, a solution of barium chloride, a sulfate-containing inorganic reagent and magnesia milk, connected through a drain pipe to the reactor , filter press - I, connected to the precipitating reactor, screw mixer, connected to the filter press - I, dust bin from ore-thermal smelting of titanium-containing concentrates and patr bkom of the discharge device of the sump, a screw mixer connected to the hopper of the initial magnesium-containing oxide materials, the metering tank of the solution and / or pulp of magnesium chloride and with the unit for molding, heat treatment and pressing of the composite mixture. New in the proposed utility model is that the output of the mother liquor from the filter press - I is directed to the collection and supply tank of chloride solutions cleaned of foreign impurities; a leaching system consisting of reactors with mixers for dissolving sludge is installed to ensure the processing of salt waste from magnesium production of carnallite chlorinators of the spent electrolyte of magnesium electrolysis cells and part of the magnesium chloride melt withdrawn from the process chain of separation of the magnetothermal obtained the titanium sponge, the lower discharge nozzles of the leach reactors have connections to an averaging tank with a stirrer, the outlet of which is directed to the reactor to clean the combined chloride solutions from impurities, there are inlet nozzles on the reactor cover, one of which is connected to an alkaline reagent dispenser, and the other connected to a dispenser and a tank for the preparation of a working solution of a precipitant - a solution of sodium sulfide and / or hydrosulfide of sodium or ammonium, the lower discharge pipe of the pulp from the reactor has a connection with a filter press - II, the output of the chloride solution purified from impurities from the filter press - II is sent to the prefabricated

the tank connected to the spray dryer, and the sediment outlet from the trough of the filter press - II is directed through the dispenser to the second screw mixer.

Description

The proposed utility model relates to the field of metallurgy, and in particular to technological equipment used in non-ferrous metallurgy for the complex processing, neutralization and decontamination of complex multicomponent polymetallic production wastes. The developed technical solution can be specifically used in the titanium-magnesium production for the neutralization of chloride melts formed at various stages, sections and compartments for the production of titanium metal — a titanium sponge — by the magnetothermic treatment of titanium tetrachloride and in the electrolytic production of magnesium metal from carnallite raw materials and magnesium chloride .

The well-known "Instrumentation line for the disposal and decontamination of polymetallic production wastes" (Certificate for PM No. 29721 by application No. 20062132135 with priority dated December 4, 2002; Registered and published May 27, 2003. Bull. No. 15. IPC С22В 9 / 02), which includes the following main technological equipment: a hydro-removal bath connected to a hydraulic sump, a collection tank of initial chloride solutions and slurries directly connected through a pump to a hydraulic-removal bath and a precipitation reactor, and a vanadium-containing wastewater collection tank connected to com-collection starting chloride solutions and slurries, cans dosing lime milk, barium chloride, sulfate inorganic reagent and a high molecular flocculant, connected through pipes and drain-precipitant reactor, a filter press connected to reaktorom-

a precipitator, a screw mixer connected to the discharge press of the filter press, a dust bin from ore-smelting smelter and a discharge pipe of a discharge sump, a screw mixer connected to a hopper-dispenser of gypsum binders, and the outlet from the screw mixer is connected to the molding unit of the composite mixture.

The known utility model ensures the neutralization of titanium production wastes from toxic and radioactive metals, however, the well-known “Technological line” does not have equipment for the processing and utilization of solutions - filtrates formed during the processing of titanium chlorine melts, and there is no equipment for the processing and utilization of various magnesium production melts .

Of the known analogues, the closest in technical essence and the achieved result to the proposed technical solution is the well-known "Technological line for the processing of metallurgical waste" (RF Certificate for PM No. 29530 by application No. 20002132141 with prior dated 04.12.2002. Regist. And publ. 20.05 .2003, Bull. No. 14. IPC ⁸ С22В 60/00) - adopted as a prototype.

The technical solution according to the prototype includes (see Fig. 1) a water removal bath (1) connected to a water sump (2), a collection tank of initial chloride solutions and slurries (3), directly connected through a pump (4) to a water removal bath ( 1) and a precipitation reactor (6), a collection tank for vanadium-containing wastewater (5), connected to a collection tank for the initial chloride solutions and pulps (3), metering tanks for high molecular weight flocculant (7), and barium chloride solution (8), sulphate-containing inorganic reagent (9) and magnesia milk (10), combined and through drain pipes, reactor precipitator (6), a filter press (11) connected to the downcomer (6), a screw mixer (12) connected to the discharge collection filter press (11),

a dust hopper from ore-thermal smelting of titanium-containing concentrates (13) and a discharge pipe of a discharge sump (2), a screw mixer (14) connected to a hopper of initial magnesium-containing oxide materials (15), a metering tank for a solution and / or pulp of magnesium chloride (16) with block molding, heat treatment and pressing of the composite mixture (17).

The implementation of the utility model of the prototype ensures the localization of highly toxic metals (thorium, radium, chromium, vanadium, manganese, etc.) and their conversion to a radiation-safe form - a dust-free water-insoluble solidified state suitable for further storage without causing environmental damage to the environment.

The disadvantage of the "Technological line" of the prototype is the lack of equipment for the disposal of solutions obtained after the neutralization of titanium production waste, and the lack of equipment for the processing and disposal of magnesium waste salt production - carnallite chlorine sludge, spent electrolyte for the electrolytic production of metal magnesium from carnallite raw materials and melts of magnesium chloride of the process of magnetothermal production of sponge titanium.

The objective of the proposed utility model is the creation of a new “Production Complex”, which ensures the disposal of almost all salt waste, including secondary production waste generated during the production of metallic titanium (titanium sponge) and metallic magnesium.

The technical result that can be obtained by implementing the proposed utility model is an additional release, based on waste management, of carnallite raw materials used directly in the general technological chain for producing titanium and magnesium.

The problem is solved with the achievement of the above technical result by the proposed utility model - “Production complex of technological equipment for processing and disposal of titanium-magnesium production wastes”, including (Fig. 2) a hydraulic removal tank (1) connected to a hydraulic sump (2), a collection tank source chloride solutions and slurries (3), connected through a pump (4) to a hydraulic removal bath (1) and a precipitating reactor (6), a collection tank for vanadium-containing wastewater (5), connected to a collection tank for initial chlorine solid solutions and pulps (3), metering tanks for high molecular weight flocculant (7), a solution of barium chloride (8), sulfate-containing inorganic reagent (9) and magnesia milk (10), connected through drain pipes to the precipitating reactor (6), a filter -press - I (11), connected to the precipitating reactor (6), a screw mixer (12), connected to the filter press - I (11), a dust hopper from ore thermal smelting of titanium-containing concentrates (13) and a discharge pipe of the discharge device of the hydraulic sump ( 2), a screw mixer (14) connected to the hopper magnesium oxide material (15), a dosing tank solution and / or slurry of magnesium chloride (16) and a molding unit, heat treatment and pressing of the composite mixture (17).

New in the proposed utility model is that the output of the mother liquor from the filter press - I (11) is directed to the collection and supply tank (18) of chloride solutions cleaned of foreign impurities; a leaching system is installed to ensure the processing of salt waste from magnesium production (19) consisting of reactors (20, 21, 22) with stirrers for dissolving sludge from carnallite chlorinators (20) of spent electrolyte of magnesium electrolytic cells (21) and part of the magnesium chloride melt (22), which is removed from the magnesium separation technological chain etermicheskogo produce titanium sponge, drain pipes of the lower reactor for leaching are connected to the blending tank

(23) with a stirrer, the outlet of which is directed to the reactor (24) to clean the combined chloride solutions from impurities, on the reactor cover there are inlet pipes, one of which is connected to an alkaline reagent dispenser (25), and the other is connected to a dispenser (26) and a tank (27) for preparing a working solution of a precipitating agent-solution of sodium or ammonium sulfide and / or hydrosulfide, the bottom discharge pipe of the pulp from the reactor has a connection with a filter press - II (28), the output of the chloride solution purified from impurities from the filter press is II sent to the combined flow rate a container (18) connected to a spray dryer (29), and the sludge output from the trough of the filter press II (28) is directed through a batcher (30) to a second screw mixer (14).

Implementation of the proposed utility model

“The production complex of technological equipment for the processing and disposal of waste titanium-magnesium production” (Fig. 2) operates and is operated as follows.

The spent melt of chlorinators enters the hydro-removal bath (1), where water and / or circulating solution (pulp) is simultaneously supplied. The resulting pulp flows by gravity into a hydraulic sump (2), where a large fraction of the insoluble residue settles into the screw mixer (12). The clarified pulp from the sump (2) is pumped (4) into the collection tank of the initial chloride solutions (3), where vanadium-containing wastewater-wastewater and mother liquors of ammonium metavanadate are fed simultaneously from the collection tank (5). A part of the pulp from the collection tank (3) is pumped (4) into the hydraulic removal tank (1), the rest goes to the precipitating reactor (6), where, to neutralize, deactivate and precipitate highly toxic and radioactive metals from the collection tanks (7, 8, 9, 10) serves a high molecular weight flocculant (e.g. polyacrylamide), a solution

barium chloride, sulfate-containing inorganic reagent (sulfuric acid or sodium sulfate) and magnesia milk. To mix the pulp and oxidize with air oxygen the compounds of ferrous iron to Fe (III), compressed air is supplied to the precipitating reactor (6) and to the hydro-removal bath (1). The pulp from the precipitating reactor (6) is sent to a filter press - I (11), where the precipitate is washed with water from soluble impurities (potassium, sodium and magnesium chlorides). Solutions (filtrate) purified from toxic metals and radioactive substances from the filter press - I (11) are sent to a collection and consumable container (18), which also receives foreign metals and suspended solids purified from impurities (after the filter press - II) solutions from the processing of salt waste from magnesium production. Wet sediment containing radioactive metals is collected in the “trough” of the filter press - I (11), from where it is sent to the screw mixer (12), where dust from ore-smelting smelting is simultaneously supplied from the hopper (13), and from the discharge device of the hydraulic sump ( 2) - sand fraction of insoluble residue. The resulting mixture is sent to a screw mixer (14), where the source magnesium-containing oxide materials - serpentinite, and / or brucite, and / or magnesite are fed from the metering hopper (15), and a solution and / or pulp are supplied from the metering tank (16) magnesium chloride, for example, a thickened magnesia pulp, formed during the purification of exhaust gases from Cl ₂ and / or Hcl with a magnesian suspension, and a precipitate obtained from the processing of magnesium waste salt comes from the hopper (29). The resulting composite mixture is then fed to the molding, heat treatment and pressing unit (17). To ensure the disposal of salt waste from magnesium production, they are fed to a leaching system (19) installed in the Production Complex, which consists of reactors with mixers for dissolving sludge from carnallite chlorinators (20), spent electrolyte from magnesium electrolytic cells (21), and part of the magnesium chloride melt ( 22) formed during the magnetothermic production of a titanium sponge and

subject to "withdrawal" from the technological cycle, due to the accumulation of heavy metal impurities in the MgCl ₂ melt. After dissolving the salt waste from the magnesium production, the resulting chloride solutions from the reactors (20, 21, 22) are sent through the lower drain pipes to an averaging tank (23) with a stirrer, from where the combined chloride solution (pulp) is pumped into the reactor (24) to clean the solution ( MgCl ₂ + KCl) from impurities of foreign metals. To this end, an alkali solution from a dispenser (25) and a solution of a reagent — a precipitant — a solution of sodium sulfide and / or hydrosulfide of sodium or ammonium — are supplied from the dispenser (26) and the tank (27) to the reactor (24) through the inlet pipes on the reactor lid. NaHS solution and / or Na ₂ S, and / or (NH ₄ ) ₂ S, etc. The pulp in the reactor (24) is mixed and fed to a filter press - II (28), the precipitate is separated from the mother liquor and sent to the dispenser ( 29), from which this sediment enters a screw mixer (14), in which a mixture of various secondary titanium-magnesium wastes occurs th production with magnesian binding materials followed by curing of the composite mixture and the transfer of waste products in non-toxic form.

Solutions of magnesium and potassium chlorides purified from impurities of foreign metals and suspended solids are sent to a collection and supply tank (18), from where the combined and averaged solution is sent to a spray dryer, in which excess moisture is removed and the resulting synthetic carnallite is collected, which is collected in a collection box bunker (29) and then shipped either to the second stage of carnallite dehydration - to the carnallite chlorinator department (31), or directly to the electrolysis department (32).

As a result of the combination of the above operations, titanium production wastes containing toxic metals and radioactive substances turn into a solidified state, i.e. convenient for long-term radiation-safe storage -

into a dust-free water-insoluble state, resistant to atmospheric precipitation, pound and soil waters, not causing environmental damage to the environment and not having a harmful effect on the health of the population and staff. In addition, the mother liquors formed after precipitation containing toxic and radioactive metals, magnesium waste salt - carnallite chlorine sludge, spent electrolytes of magnesium electrolysis cells and magnesium chloride melt obtained in the process of magnetothermal production of sponge titanium are processed according to the proposed technical solution to obtain synthetic carnallite used directly in the general technological process for the production of titanium and magnesium.

Claims (1)

The industrial complex of technological equipment for the processing and disposal of titanium-magnesium production wastes, including a hydro-removal bath for the spent titanium chlorine melt, a water sump, a collection tank for receiving the initial concentrated solution, a filter press - I, a collection tank for vanadium-containing wastewater connected to the tank - a collection of initial chloride solutions, a reactor for the deposition of the sum of metal oxyhydrates, the upper nozzles of which are connected to metering tanks of high molecular weight ulyant, a solution of barium chloride, sulfate-containing inorganic reagent and magnesia milk, and the drain pipe forms a connection to the filter press - I, the outlet from the "trough" of the filter press - I is directed to a screw mixer, the inlet of which is connected to the dust bin from ore-thermal smelting of titanium-containing concentrates and a nozzle of the discharge device of the sump, and the outlet is directed to a second screw mixer connected to the hopper of the initial magnesium-containing oxide materials, a metering tank of the solution and / or chlorine pulp magnesium id and with a block for molding, heat treatment and pressing of the composite mixture, characterized in that the output of the mother liquor from the filter press - I is directed to the collection and supply tank of chloride solutions purified from foreign impurities, a leaching system is installed to ensure the processing of salt waste from magnesium production, consisting of reactors with stirrers for dissolving sludges of carnallite chlorinators, spent electrolyte of magnesium electrolysis cells and part of a magnesium chloride melt removed from technolo of the cycle of separation of the magnetothermal production of a titanium sponge, the lower discharge nozzles of the leach reactors are connected to an averaging tank with a stirrer, the outlet of which is directed to the reactor to clean the combined chloride solutions from impurities, on the reactor lid there are inlet nozzles, one of which is connected to an alkaline dispenser reagent, and the other is connected to a dispenser and a tank for preparing a working solution of sodium or ammonium sulfide and / or hydrosulfide, ammonia bottom discharge pipe from the reactor, and there is a connection with the filter press - II, the output of the chloride solution purified from impurities from the filter press - II is sent to a collection container connected to the spray dryer, and the output of sediment from the trough of the filter press - II is sent through a batcher to the second screw mixer .