Method for processing salt rejects of magnesium production |
||||||||||||||||||||||||||||||||
|
IPC classes for russian patent Method for processing salt rejects of magnesium production (RU 2316604):
Method of recovering precious metals from of sulfuric acid production ash waste / 2315817
Invention relates to recovery of precious metals from of sulfuric acid production ash waste obtained from sulfuric pyrite firing stage. Method contemplates mixing ashes with a reagent, irradiating resulting mixture by microwave field, and separating it into non-magnetic residue and magnetic fraction. The latter is treated with acid and/or oxidant solution. Precious metals are sorbed from solution and suspension obtained by a sorbent, which is further burned off to give concentrate of precious metals containing notably Pt, Pd, Rh, Au, and Ag. Above-mentioned reagent is selected from potassium hydroxide and mixtures thereof with sodium formate or sodium carbonate, or potassium nitrate, or with oxalic acid, mixtures of oxalic acid with sodium formate, zinc powder with tin dichloride, and sodium peroxide with sodium carbonate. Sorbent is selected from 1,1-bis(perhydro-1,3,5-dithiazinin-5-yl)ethane, 1-hydroxy-2-(perhydro-1,3,5-dithiazinin-5-yl)ethane, 2-(perhydro-1,3,5-dithiazinin-5-yl)acetic acid, and polydithiopropane.
Method for processing of return converter slag of nickel-cobalt production in mixed smelting of the same with agglomerate in shaft furnace / 2315816
Method involves providing mixed charging into shaft furnace of burden containing agglomerate, coke, mixture of lime with pyrites, return converter slag; smelting for producing of nickel material and waste slag; introducing return converter slag into burden in the form of mixture with pyrites used in the ratio of (9-14):1.
 Valuable metal extraction process from super-alloys / 2313589
Super-alloy is used as both electrodes, anode and cathode. Electrochemical decomposition is realized at changing polarity of electric current with frequency 0.005 - 5 Hz while using non-organic acid as electrolyte.
 Aluminum-containing raw material processing method / 2312815
Invention is directed to production of alumina and can be used for processing of aluminum-fluorine-carbon-sulfur-containing aluminum production waste, which is considered as man-made variety of aluminum-containing raw material. Processing method comprises preparing charge from aluminum-containing material (above mentioned waste) and limestone followed by caking at 550-800°C and leaching cake, wherein charge is characterized by molar ratios Ca:F2=0.8-1.2 and Ca:S=1.0.
Method of extraction of rhenium and other elements / 2312158
Proposed method includes collection of volcanic gas and cooling it to temperature of 130-150°C due to evaporation of water fed to the gas duct in sprayed form, thus converting the rhenium compounds and compounds of other metals into solid state. During cooling of volcanic gas, liquid elementary sulfur is separated which is used for entrapping rhenium and other metals in high-speed turbulent dust collector or in cyclone. Prior to cooling volcanic gas, elementary sulfur is fed to hot volcanic gas in the amount sufficient for coagulation of dust with drops of liquid in high-speed turbulent dust collector.
Method of preparation of metallurgical slags for enrichment / 2309186
Proposed method includes treatment of slag in centrifugal rotor-type crushing unit provided with horizontal or vertical rotor including impact accelerating members and reflecting surfaces. Rate of impact of accelerating member against particle is no less than 20 m/s. At such rate of impact "selective grinding" takes place: weak particles are ground and strong particles are retained at similar action of material. As a result, metal and slag component are separated; metallic particle of slag which were not ground do not break the machine.
Manganese-containing raw material agglomeration method / 2307178
Method comprises steps of metering, mixing, palletizing and sintering under pressure charge including lime stone, hard fuel, manganese-containing raw material and low-silicon iron-containing material and being in the form of slime of steel melting production or scale; performing palletizing by successively applying on lime stone particles with fraction size 5 - 0 mm at first low-silicon iron containing material and then mixture of manganese containing materials and hard fuel. Invention provides increased by 5 -6 times efficiency of aggregate, increased mechanical strength of product due to lowered by 26.7% consumption of hard fuel.
Method of processing zinc-containing waste of ferrous metallurgy / 2306348
Proposed method includes preparation of starting raw charge; zinc-containing blast-furnace sludge is first dried to moisture content not exceeding 3-4% and is mixed with binder containing calcium hydroxide and/or bentonite and circulating materials. Mixture is ground, moistened and lumped for obtaining pellets and briquettes. Lumped material is subjected to high-temperature treatment at heating rate of 10-30 deg/min (preferably, 20 deg/min) to temperature of 1110-1230C (preferably, 1200C) and is kept at this temperature for 20-40 minutes, after which it is discharged through hot end of furnace, cooled down and is subjected to separation by sizing; separated fines are returned for grinding the charge and/or are used for blast-furnace melting. Dust-and-gas mixture is evacuated from furnace through its cold end and is subjected to processing for separation of zinc iron-containing dust and zinc sublimates by know methods. Besides that, blast-furnace sludge is processed at addition of converter sludge of steel making process into charge. Lumped material is heated to temperature of 1110-1150C (preferably up to 1120C). Roasted lumped material is subjected to screening for separation of minus 5 mm fraction which is directed for grinding the mixture of blast-furnace sludge and binder. In case of deficiency of carbon in charge, use is made of peat as carbon reductant which is introduced under layer of pumped material during transportation into roasting furnace.
Titanium-steel composition material separation method / 2305624
Method comprises steps of thermally acting upon material till temperature of active inter-phase inter-action of titanium and steel 950 -1000°C; soaking at such temperature for 3 - 10 h till formation in zone of titanium and steel joining of fragile layer with thickness 180- 220 micrometers; realizing quenching in water or aqueous solution of NaCl with concentration no more than 15% for achieving spontaneous separation of composition material. According to invention outer force action is not necessary for separation of titanium and steel of composition material.
 Method of utilization of the solutions formed at reprocessing of the spent lead accumulators / 2304627
The invention is pertaining to metallurgy and in particular to the method of reprocessing of the sulfate-oxide fraction (the active mass) of the lead accumulator scrap. The method provides for reprocessing of the spent lead accumulators by the desulphurization using the solution of the sodium hydroxide with the subsequent wash of the organic fraction. The utilization of the formed solutions is exercised by the electrodialysis with recovery of the sodium hydroxide and production of the sulfuric acid. The electrodialysis is exercised in the chambers of the electrodialysis apparatus with usage of the bipolar membranes at the direct-current voltage of 30 V with production of the low-mineralized water with the salt contents of no more than 0.3 g/l. The low-mineralized water from the chambers of the electrodialyzer is routed to the washing of the desulfurized active mass and other components of the accumulator scrap. The technical result of the invention is the isolation of the cycle of the utilization of the sulfate solutions formed at reprocessing of the active mass of the lead accumulators.
Method of separation of potassium chloride / 2315713
Proposed method includes dissolving of sylvinite, clarification of hot saturated lye, crystallization of product in presence of fluoro-reagents, thickening and filtration of suspension and treatment of non-clarified saturated lye. Clarified saturated lye is treated with hot solution saturated with potassium chloride before crystallization of product. Potassium chloride solution is obtained by dissolving off-grade floatation potassium chloride in water. Off-grade floatation potassium chloride is just cyclone dust, fine fractions of floatation product or filtered-off intermediate product used for forming sludge suspension which is clarified and is thickened after clarification and is directed for treatment of non-clarified saturated lye.
Potassium chloride and sodium chloride production process / 2307790
Invention is intended for use in chemical and mining industries to manufacture mineral fertilizers and food salts. Ground sylvinite ore is dissolved in recycled potassium chloride-saturated lye. Resulting solution is directed at a rate of 0.03-0.15 m/s to leaching in the first dissolution column, with its electrodes connected to one of a current source poles, and treated by low-frequency (1-5 Hz) alternating electric field at voltage 30-100 v. Solution thus enriched with potassium chloride is fed together with solid phase into the downstream second dissolution column with its electrodes connected to opposite pole of the current source. Treatment by alternating electric field in the second column is effected under the same conditions as in the first column. Two-step leaching results in potassium chloride solution and sodium chloride-enriched solid phase. Separated sodium chloride is sent to production of food salt. Potassium chloride is separated from solution via crystallization.
 A method of obtaining a crystal of potassium chloride from the cyclone dust potash ore flotation concentrate / 2232130
The invention relates to the processing of sylvinite ores in potash and is intended for the production of white potassium chloride from the cyclone dust flotation concentrate
 The method of obtaining dust-free potassium fertilizers / 2215717
The invention relates to techniques for the production of potassium chloride from sylvinite ores with low content of dust fractions
 The method of obtaining potassium fertilizers / 2196759
The invention relates to the field of production of potash fertilizers from sylvinite ores by flotation method
The method of obtaining salt / 2167286
 The method of obtaining potassium chloride / 2154025
The invention relates to techniques for processing fine potassium chloride, resulting in the production of potash fertilizers from sylvinite ores
 The method of obtaining potassium chloride / 2147011
The invention relates to the processing of potash ores, in particular the production of mineral fertilizers
The method of obtaining potassium chloride / 2143999
The invention relates to techniques for the production of potassium chloride from sylvinite ores by the method of dissolution-crystallization
Potassium chloride and sodium chloride production process / 2307790
Invention is intended for use in chemical and mining industries to manufacture mineral fertilizers and food salts. Ground sylvinite ore is dissolved in recycled potassium chloride-saturated lye. Resulting solution is directed at a rate of 0.03-0.15 m/s to leaching in the first dissolution column, with its electrodes connected to one of a current source poles, and treated by low-frequency (1-5 Hz) alternating electric field at voltage 30-100 v. Solution thus enriched with potassium chloride is fed together with solid phase into the downstream second dissolution column with its electrodes connected to opposite pole of the current source. Treatment by alternating electric field in the second column is effected under the same conditions as in the first column. Two-step leaching results in potassium chloride solution and sodium chloride-enriched solid phase. Separated sodium chloride is sent to production of food salt. Potassium chloride is separated from solution via crystallization.
|
FIELD: non-ferrous metallurgy, namely processing of solid waste salt material formed at electrolysis process to commercial products. SUBSTANCE: method comprises steps of grinding salt rejects material; leaching them by means of concentrated solution of potassium chloride; separating mother liquor and solid potassium chloride; washing potassium chloride and drying potassium chloride; before washing procedure, dissolving solid potassium chloride in water at temperature 70 - 90°C; filtering solution and cooling filtrate till temperature 10 - 25°C; filtering received suspension of potassium chloride; washing deposit by means of potassium chloride solution with concentration 300 - 350 g/dm3 and filtering it; returning prepared filtrate for leaching salt rejects material. EFFECT: possibility for producing high-quality potassium chloride from salt rejects of magnesium production and therefore lowered quality of waste materials. 1 tbl, 1 ex
The invention relates to ferrous metallurgy, in particular to the production of magnesium by electrolysis of molten salts, in particular to the processing of solid salt waste generated in the electrolysis process, trademark products. There is a method of processing salt waste magnesium production (kN. Adanson M.A. - metallurgy of magnesium and other light metals. - M.: metallurgy, 1974. - P.110-111), including removing the spent electrolyte from the electrolytic cell for the production of magnesium and load it in a steel box, cooling of the electrolyte and grinding his first vibroresearch, then on the crushers. Crushed the electrolyte is subjected to classification into fractions, selected fraction of 1-3 mm and use it as fertilizer. The disadvantage of this method is the low quality of the product, which leads to deterioration of consumer properties of the product. This is due to the high content of impurities in the finished product of magnesium chloride to 10% and sodium chloride to 20%. There is a method of processing salt waste magnesium production to obtain potassium chloride (U.S. Pat. Of the Russian Federation No. 2120407, publ. 20.10.1998, bull. 29), the number of General features adopted by the closest analogue is the prototype, including the crushing of the electrolyte, the leaching of magnesium chloride and sodium chloride concentrated solution of chlorine is IDA potassium, in this first leaching lead to obtaining a solid phase enriched in potassium chloride, followed by washing her with the washing of the solid phase using saturated in potassium chloride solution, and leaching serves a concentrated solution of potassium chloride, obtained after solid-phase washing, drying potassium chloride. This method allows you to partially solve the problem of waste disposal magnesium production to produce high-quality product - potassium chloride 95,7 wt.%. The disadvantage of this method is the low quality of the product, which does not allow to use the resulting potassium chloride in other industries, such as pharmaceutical and analytical chemistry. This is due to the high content of impurities in the finished product of magnesium chloride to 10% and sodium chloride to 20%. The technical result is to eliminate the disadvantages of the prototype and allows to obtain the potassium chloride high quality of the salt waste magnesium production and high yield of the finished product - potassium chloride from waste magnesium production, thereby reducing the amount of waste dumped at the dump, and use the resulting chemically pure potassium chloride in the pharmaceutical industry and analytical chemistry. The technical result is achieved by the fact that h is about a method for processing salt waste magnesium production, including crushing, leaching with concentrated solution of potassium chloride, separating the mother liquor and solid potassium chloride, washing with a solution of potassium chloride and drying of potassium chloride, it is new that before washing the solid potassium chloride is dissolved in water at a temperature of 70-90°C, the solution is filtered, the filtrate is cooled to a temperature of 10-25°obtained a suspension of the potassium chloride is filtered, the precipitate is subjected to leaching with a solution of potassium chloride with a concentration of 300-350 g/DM3and filtration and the filtrate is returned to the leaching of salt waste. The proposed method allows for a new set of actions (methods) and select the optimal modes to receive waste from magnesium production of chemically pure potassium chloride. Washing of the solid calcium chloride water when water temperature is below 70°To reduce the concentration of potassium chloride in the filtrate, and consequently reduce the yield of the target product. Washing of the solid potassium chloride water at temperatures above 90°inappropriate because of the unproductive water heating costs. Cooling of the filtrate to a temperature below 10°will lead to the use of expensive refrigerants and refrigeration equipment. Cooling of the filtrate to a temperature above 25°With will lead to decrease in the course of the target product. Washing the precipitate with a solution of potassium chloride with a concentration of less than 300 g/DM3will lead to the leaching of potassium chloride and thus to decrease the yield of the target product, to reduce the speed of the process, specific and aggregate performance. When you use when washing the precipitate solution of potassium chloride with a concentration above 350 g/DM3happens premature crystallization and crystal driving equipment that reduces the yield, specific and aggregate performance. Conducted by the applicant's analysis of the prior art showed that the applicant had not found the source, which is characterized by signs, identical distinctive features of the invention. Therefore, the claimed invention meets the condition of patentability "novelty". To verify compliance of the claimed invention to condition patentability of "inventive step" applicant additionally conducted a search of the known solutions to identify characteristics that match the distinctive features of the prototype of the signs. The search results showed that the claimed invention is not obvious to a person skilled. Therefore, the claimed invention meets the condition of "inventive step" An example of the method. Salt waste magnesium Pro is svojstva is spent electrolyte, produced in the electrolysis process harmegnies raw material in molten alkali metal chlorides in the number of 4-4 .5 tons per 1 ton of produced magnesium (TU 1717-453-05785388-99). The composition of spent electrolyte, wt.%: potassium chloride -72,5, sodium chloride - 21,0, magnesium chloride - 5.0, calcium chloride - 1.0, magnesium oxide and 0.5. The spent electrolyte remove the vacuum ladle from electrolysis in molten form, is poured into the vessel, cooled to a solid state, is extracted from the tank, crushed to particle sizes of 1-3 mm and load capacity, which with constant stirring served on the leaching of 20%solution of potassium chloride from the stage of re-washing the solid potassium chloride. Technical potassium chloride is separated from the mother liquor, dissolving water in the reactor at a temperature of 80°C. After which the solution is filtered on a filter press to separate the solids. The resulting filtrate is cooled in the reactor to a temperature of 12°Since, then, after cooling the filtrate, the suspension is again filtered on a filter press. The precipitate was washed with a saturated solution of potassium chloride with a concentration of 325 g/DM3and then dried in a fluidized bed furnace with obtaining chemically pure potassium chloride (>99.5 wt.% KCl). The filtrate is returned to the dissolution of technical potassium chloride. The table gives the yield of potassium chloride on the rototype and on the proposed technology.
Thus, the claimed method of processing salt waste magnesium production allows to obtain the potassium chloride high quality of the salt waste magnesium production and with a high degree of extraction of potassium chloride up to 99.5-99.7 per cent, thereby reducing the amount of waste dumped at the dump, and use the resulting chemically pure potassium chloride in the pharmaceutical industry and analytical chemistry. A method of processing salt waste magnesium production, including crushing, leaching of concentrated restoranlarda potassium, the separation of the mother liquor and solid potassium chloride, washing with a solution of potassium chloride and dried potassium chloride, characterized in that before washing the solid potassium chloride is dissolved in water at a temperature of 70-90°C, the solution is filtered, the filtrate is cooled to a temperature of 10-25°obtained a suspension of the potassium chloride is filtered, the precipitate is subjected to leaching with a solution of potassium chloride with a concentration of 300-350 g/DM3and filtration and the filtrate is returned to the leaching of salt waste.
|
|||||||||||||||||||||||||||||||
