226 results about "Goethite" patented technology

The invention discloses a benefication method for recovering specularite. The method comprises the processes of primary grinding, grading, primary low intensity magnetic separation, and tailings discarding by primary high intensity magnetic separation; rough concentrate pre-classification by the primary low intensity magnetic separation and the primary high intensity magnetic separation, secondary grinding, secondary low intensity magnetic separation to obtain concentrates, secondary high intensity magnetic separation to obtain concentrates; and selective flocculation desliming secondary conducted on high intensity magnetic separation tailings (middlings), and anionic reverse flotation. The method further comprises the step of arranging a cylindrical slag separating sieve before the primary high intensity magnetic separation. With the advantages that the iron concentrate grade and the iron recovery are high, the loss of granular iron minerals is low, the mineral process flow is short, concentrates and tailings can be obtained in advance and the energy consumption of the benefication is low, the invention can be used not only for selecting specularite ores, but also for selecting weakly magnetic iron minerals, such as hematite, goethite, siderite, limonite, and the like.

The invention discloses a method for separating enriched nickel and cobalt from a laterite nickel ore lixivium, which comprises the following steps: after solid and liquid separation between the laterite nickel ore lixivium and ore slag is implemented, a vulcanizing agent is added into the lixivium, the solid and the liquid are separated after reaction precipitation, and precipitated solid is washed by a new lixivium, thus obtaining sulfide precipitate; after the sulfide precipitate is pulpified, sulphuric acid and solution of nitric acid and mixed acid are added so as to implement oxidizing leaching; the goethite method is adopted for removing iron from a superior pickle liquor; a sodium thiosulfate solution is added so as to implement copper removing; a filtering liquor that is the enriched nickel and cobalt solution is obtained. Compared with the prior art, the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium is implemented at normal temperature and normal pressure, does not need a high-pressure caldron, has less device investment, low running cost, simple technical path, short process and controllable production scale; the vulcanizing agent and acids that are used in the technique can be recycled to the utmost extent and do not have emissions and environment pollution; the extraction yield of nickel and cobalt can achieve over 95 percent, and the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium has low production cost and easy industrialization.

The invention provides a method for directly producing high-purity electronic level cobaltous sulfate by using cobalt-containing waste, in particular a process for producing cobaltous sulfate by using cobalt-containing waste. The method comprises the steps of: checking and classifying raw materials, wet-milling and size-mixing, acid-decomposing, filtering, washing, separating, and extracting copper sponge. The method is characterized by also comprising the steps of: removing iron with a goethite process, extracting P2O4 and removing impurities, separating nickel from cobalt, extracting N235, purifying, concentrating and crystallizing. The high purity electron level cobaltous sulfate is directly regenerated by using various kinds of cobalt wastes, the requirement of the modern high-technology industry on high purity of the cobaltous sulfate is met; the total recovery of the cobalt is higher than or equal to 98 percent; various usable elements can be comprehensively recycled, and coppersponge, tungsten carbide, iron hydroxide and nickel carbonate can be regenerated while the electronic level cobaltous sulfate as a main product is regenerated. The invention has the advantages of comprehensively utilizing waste cobalt resources, recycling the wastes, improving the enterprise benefit, and being beneficial to the development of energy conservation, emission reduction, environment protection and circular economy.

The present invention provides an iron depositing method of high acid and high iron solution goethite during zinc hydrometallurgy, comprising the following steps: a) carrying through oxidization leaching for zinc concentrate ore by using a sulphuric acid contained solution; b) reducing the leaching liquid by the zinc concentrated ore; c) pre-neutralizing the reduced liquid until pH value is 1.5-2.5, and generating a supernatant and a base flow via solid and liquid separation; d) carrying through goethite iron depositing for the generated supernatant, wherein after iron is deposited, liquid and solid are separated; the overflow is returned into a purification process; a part of the base flow is returned to a first iron depositing reactor as a seed crystal, and the rest base flow is discharged outwardly. The method provided by the present invention, iron is deposited in a form of goethite by using a high acid and high iron solution generated during zinc refining procedure; the grade of iron slag is high; and emissions of waste residues, waste gas and waste water are not increased.

The invention discloses a novel beneficiation technology of high-grade ferrochrome ore. The novel beneficiation technology includes the following technological processes that ferrochrome ore is broken and is screened and classified into the ore of +20 mm fraction and the ore of -20 mm fraction. The ore of the +20 mm fraction receives manual back picking or hotching, large waste ore is thrown, and block concentrate is obtained. The narrow grade of the -20 mm fraction is screened and classified into four fractions, namely the 20-15 mm fraction, the 15-6 mm fraction, the 6-2 mm fraction and the 2-0 mm fraction. For the 20-15 mm fraction, the 15-6 mm fraction and the 6-2 mm fraction, a permanent magnet roller type intensity magnetic separator is used for performing dry intense magnetic separation. The 2-0 mm fraction is further screened and classified into the 2-0.8 mm fraction and the 0.8-0 mm fraction. For the 2-0.8 fraction, a shaker is selected again to obtain shaker gravity concentrate, and for the 0.8-0 mm fraction, a spiral chute and the shaker are used and a united procedure is selected again to obtain the thin-particle gravity concentrate. The novel beneficiation technology can be used for obtaining the concentrate and removing tailings in advance and has the advantage of being lower in energy consumption compared with other technologies. The technology can be used for grading chrome ore and can also be used for grading other weak magnetic iron minerals such as manganese ore, goethite, siderite and limonite.

The invention discloses a composite stabilizer for repairing lead, cadmium and arsenic pollution in acid soil. The composite stabilizer comprises the following components: calcium superphosphate, goethite, humic acid, quick lime, polyacrylamide and the like. The composite stabilizer is used for repairing heavy metal polluted soil, arsenic, lead and cadmium can be fixed and stabilized simultaneously, the use amount is small, a soil structure is not affected, the soil repairing effect is good, and re-dissolution of heavy metal can be prevented.

This invention relates to a method of manufacturing an organic-inorganic composite hybrid adsorbent by impregnating activated carbon nanopores with an oxide and a water treatment method using the same, and particularly, to an adsorbent including a porous adsorbent and ferrihydrite, goethite, hematite or magnetite incorporated into the porous adsorbent, and a manufacturing method thereof.

An atmospheric leach process in the recovery of nickel and cobalt from lateritic ores, said processing including the steps of: a) separating the lateritic ore into a low magnesium containing ore fraction, and a high magnesium containing ore fraction by selective mining or post mining classification; b) separately slurrying the separated ore fractions; c) leaching the low magnesium containing ore fraction with concentrated sulphuric acid as a primary leach step; and d) introducing the high magnesium content ore slurry following substantial completion of the primary leach step and precipitating iron as goethite or another low sulphate containing form of iron oxide or iron hydroxide, wherein sulphuric acid released during iron precipitation is used to leach the high magnesium ore fraction as a secondary leach step.

The invention discloses a phosphorus-removing method based on nano-grade iron. The nano-grade iron is prepared by reducing crushed goethite (0.1-5mm) by using hydrogen or carbon monoxide under an environmental temperature of 500-700 DEG C. A phosphorus-removing principle is that: the nano-grade iron obtained by the reduction of goethite releases Fe<3+> under the effects of water and dissolved oxygen; Fe<3+> and PO4<3-> forms FePO4 precipitate; and trace phosphorous in water is removed. With the method provided by the invention, phosphorous-containing wastewater can be effectively purified, and especially a deep phosphorus-removing effect can be provided.

A process is described for the extractive oxidation of contaminants present in raw fuel streams rich in heteroatomic polar compounds and catalyzed by iron oxides contained in natural limonitic goethite, said process comprising contacting said streams with an oxidation pair which is a peroxide in solution/organic acid in amount of at least 3 and an amount between 0.01 and 10 wt % of an iron oxide, both based on the feed, the iron oxide being made up of a reduced natural limonitic goethite. The goethite reduction by a hydrogen stream has the advantage of lowering the migration of non-contaminating polar hydrocarbons from the fuel stream to the aqueous phase, at the same time obtaining higher mass yield of final product fuel while the level of target contaminants to be removed is maintained relative to the state-of-the-art process. Process yields attain 98% weight/weight.

The invention provides a method for removing trivalent arsenic, comprising the following steps: (1), oxidizing trivalent arsenic in an arsenic solution into pentavalent arsenic at pH of 0.9-1.5 by using ozone to obtain pentavalent arsenic solution; (2), adding a soluble divalent iron source into the pentavalent arsenic solution, oxidizing divalent iron at a temperature higher than 70 DEG C at pH less than 1.5 into trivalent iron, and reacting the pentavalent arsenic with trivalent iron to obtain a solution containing scorodite crystal precipitate, goethite precipitate and divalent iron; (3), adjusting pH of the solution obtained in step (2), oxidizing the divalent iron in the solution to form iron peroxide gel, and carrying out solid-liquid separation to obtain a purified solution.The method enables low-concentration arsenic in waste water to be removed, arsenic content of the purified solution is lower than 0.05 mg/L, the precipitates generated in the arsenic removal process are easy to remove, and the method is simple to perform and is widely applicable to purifying waste water containing low-concentration arsenic.

The invention relates to a method for recovering Cu, Zn and Fe from sulphide ore calcine pickle liquor containing Au and Ag. The method comprises the following steps of: adding sulfuric acid to pickle liquor containing Fe, Cu and Zn to regulate the pH value; adding an oxidant in the presence of stirring to ensure that Fe in the solution forms into a goethite precipitate; filtering and washing to recover the goethite and then regulating the pH value; adsorbing Cu and Zn through a resin column; washing off impurities by using water and desorbing Cu and Zn by using a sulfuric acid solution; and heating, evaporating, concentrating and crystallizing a desorbed copper sulfate solution or a zinc sulfate solution to obtain copper sulfate or zinc sulfate. In the method, Fe, Cu and Zn contained in the sulphide ore calcine pickle liquor are comprehensively recovered by adopting a resin method, and the recovery rate of the Fe, Cu or Zn reaches higher than 95 percent. The method has low recovery cost, simple process and small pollution.

A method is provided for the efficient stabilization, removal and disposal of arsenic-containing wastes generated in metal recovery processes that employ roasting techniques and the like. The conversion of the mostly trivalent arsenite compounds in the wastes to mostly pentavalent solid arsenate precipitates is accomplished by mixing the wastes with water and a ground iron-containing mineral, such as goethite, to form an aqueous slurry of wastes and ground iron-containing mineral, acidifying the slurry to a pH of less than about 1.0, treating the acidified slurry with oxygen gas in a pressurized vessel at a temperature higher than about 120° C. and providing an oxidation catalyst comprised of a water-soluble nitrate and a water-soluble iodide. The overall efficiency of the controlling chemical reactions is improved by the addition and use of the catalyst. The resulting solid arsenate precipitates, in the form of scorodite, are ideally suited for safe disposal with minimum or no further treatment. Unconverted soluble trivalent arsenic compounds remaining in solution may be converted and precipitated as additional scorodite by mixing and agitating the slurry with soluble iron salts under controlled conditions. The resulting precipitates meet or exceed environmental requirements for impoundment and safe disposal.

The invention discloses a comprehensive recovery process of low-grade matte slag metal resources. The process comprises the following steps: 1) matte slag performs the crushing and the wet ball milling to reach 100% of particle sizes less than 0.074 mm, and is magnetically separated by a permanent magnetic separator; and magnetically separated tailing is dehydrated for metal leaching and extraction; 2) the magnetically separated tailing performs the oxide leaching to comprehensively leach and extract valuable metal; leaching liquid is extracted to recover Cu; and strip liquor passes through electrodeposition cathode copper plate; 3) copper raffinate removes iron by using a goethite method; after Fe is removed, supernatant is extracted to recover Zn, and the strip liquor is concentrated and crystallized to prepare zinc sulfate; the obtained raffinate is extracted to recover manganese; and the strip liquor is concentrated and crystallized to prepare manganese sulfate; 4) after the raffinate is absorbed by activated carbon to reduce COD, heavy metal is treated by sulfide precipitation; and 5) after leaching slag performs the alkali washing, elemental sulfur and a lead-silver sulfide ore are recovered by flotation. The process solves the difficulty of incomplete recycling of low-grade matte slag, realizes comprehensive recovery of low-grade matte slag resources, and is higher in environmental benefit and economic benefit.

The invention belongs to the technical field of manganese metallurgy and discloses a method for carrying out reduction acidolysis-leaching and simultaneously removing iron to treat oxidized manganeseore. The method comprises the following steps of carrying out reduction acidolysis and leaching, and simultaneously removing the iron. According to the method, biomass waste such as wood dust, straw and the like is used as a reducing agent, so that the environment pollution is reduced, the waste is turned into wealth, and the production cost is reduced. By adopting reduction acidolysis technology,the biomass structure is destroyed by using concentrated sulfuric acid, so that cellulose, hemicelluloses and other substances are hydrolyzed into micromolecular reducing sugar and are used for reducing manganese ore. No heating is needed in the aging process, and the energy consumption is not increased. After aging, the high-valence manganese oxide is reduced to manganese sulfate and can be directly dissolved in water. When the acid solution is leached, the iron ore method is adopted to remove the iron, so that manganese is fed into the solution in the form of manganese sulfate, and the ironis precipitated out by using a goethite-shaped precipitate. The leaching and iron removal are combined together, so that the process flow can be shortened, the operation can be simplified, and the problems that the existing biomass is high in leaching temperature, long in time and the like when the manganese oxide ores are directly leached from the existing biomass are solved.

The invention discloses a process for comprehensively recycling electrolytic manganese residues and manganese tailings. The process for comprehensively recycling the electrolytic manganese residues and the manganese tailings specifically comprises the following steps that liquid-phase crushing is performed on the electrolytic manganese residues by adopting a dispersion machine so as to obtain leached residues and leachate; a qualified de-ironed precursor solution without solid particles is obtained through filter pressing, and hydration pulping is performed on the magnesium oxide through the dispersion machine. The process for comprehensively recycling the electrolytic manganese residues and the manganese tailings has the advantages that as long as the manganese content of the electrolyticmanganese residues and the manganese tailings is greater than 1%, the manganese can be enriched and recovered, so that a new profitable industrial way is developed for resource comprehensive recoveryof the manganese tailings, the problems that when electrolytic manganese is produced through a traditional process, pollution is caused due to the fact that sodium jarosite and goethite which are generated through purification iron removal cannot be recovered, the purity of the electrolytic manganese is low due to the fact that the leaching solution is not purely purified and the like are solved,and the process is simple, stable and strong in operability.

A method for treating normal pressure leaching of transitional nickel laterite ore is characterized by comprising two steps which can simultaneously conduct pretreatment and leaching of the nickel laterite ore. The two steps are as follows: (1) pretreatment of the nickel laterite ore and ore grinding: breaking the nickel laterite ore and grinding the ore, adjusting the moisture content, adding concentrated sulfuric acid, and placing the mixed nickel laterite ore for spare after fully being fully stirred; and (2) leaching and deironing: blending magnesium oxide after smashing the block-shaped pretreated materials, adding the blended materials into aqueous solution after being fully and uniformly mixed, conducting the process of Ni-Co leaching and deironing simultaneously, maintaining the liquid-solid ratio, the solution temperature and the solution of the potential hydrogen (pH) value, and conducting liquid-solid separation after being stirred. The normal pressure leaching technology treats the nickel laterite ore which contains 0.8-1.5% of nickel, the leaching rate of nickel can reach above 85%, the leaching rate of cobalt is above 70%, and the liquid-solid separation is easy to carry out. The main phase composition of the leached sunk iron slag after washing is goethite (FeOOH), MgSiO3 and SiO2, no harmful ingredients are contained, and the sunken iron slug can be piled or reutilized.

The invention discloses a method for fixing arsenic by preparing a ferric arsenate/goethite material of a core-shell structure by means of an arsenic-containing solution. The method comprises the steps that after the pH value of the arsenic-containing solution is adjusted to be acidic, ferrite is added into the arsenic-containing solution, oxygen-containing gas is led into the arsenic-containing solution, a reaction occurs on the heating condition when the solution is stirred, and ferric arsenate sediment is obtained; and the ferric arsenate sediment is immersed into an alkaline solution for reacting, and then the ferric arsenate/goethite material of the core-shell structure is obtained. According to the method, the ferric arsenate/goethite material of the core-shell structure and with quite good stability can be prepared from arsenic in the arsenic-containing solution by means of a simple and low-cost process, and permanent fixing of the arsenic is achieved.

The invention discloses a beneficiation method for recovering chrome lump ore. The method comprises the following processing steps: crushing the chrome ore, and classifying three particle size grades including 20-15mm, 15-6mm and 6-2mm by narrow level screening; respectively carrying out dry-type strong magnetic separation on the three classified particle size grades obtained by screening by virtue of a permanent magnet roller type strong magnetic separator; adjusting the speed of a feeding belt of the permanent magnet roller type strong magnetic separator and the distance between the center of a barrel and a separating clapboard to obtain the best grading technical index, wherein the magnetic field intensity of the surface of the belt of the permanent magnet roller type strong magnetic separator is 0.9-1.3T. The method is simple in technological process, the high-quality Cr2O3 ore concentrate can be obtained by screening classification and narrow level screening, and the recovery rate of the Cr2O3 can be increased. The method is short in beneficiation process and is capable of obtaining the ore concentrate and removing tailings in advance; the beneficiation technology has the advantage of being lower in energy consumption compared with other technologies; the method not only can be used for screening the chrome ore, but also can be used for screening other weak magnetic iron minerals such as manganese ore, hematite, goethite, siderite and limonite.

The invention discloses air-stable nano zero-valent iron as well as a preparation method and application thereof. Natural iron ores of goethite, limonite and hematite and the like are used as precursors, hydrogen is used as a reducing agent for high-temperature reduction to prepare the nanometer zero-valent iron, then the nanometer zero-valent iron is slowly oxidized with air, and the iron oxide layer with 3-5 nm is formed on the surface of the nanometer zero-valent iron. According to the method and the application, used materials are cheap and easily available materials, the preparation method is simple, the cost is low, no additional elements are introduced in the preparation process, and toxic and harmful elements are not contained; and the iron ions released in the water treatment process can further form a flocculating agent to remove phosphate radicals and other pollutants.

The invention discloses a nickel oxide ore acid leaching solution two-step iron removal method. The method comprises the following steps: adding garnierite ore pulp into a nickel oxide ore acid leaching solution, stirring and reacting until the dissolution is completed and the pH value of the solution is more than or equal to 1.6, performing liquid-solid separation, raising the temperature of obtained liquid to 130-170 DEG C, stirring and reacting for 1-3 hours, performing liquid-solid separation, and drying a solid to obtain a hematite product; adding the garnierite ore pulp into the collected liquid for the second time, stirring and reacting until the dissolution is completed and the pH value of the solution is about 2, performing liquid-solid separation, and adding magnesium oxide and an oxidizing agent into the obtained liquid, or only adding the oxidizing agent; stirring and reacting for 0.5-4 hours, performing liquid-solid separation, and drying the solid to obtain a goethite product. By adopting the method disclosed by the invention, complete iron removal can be achieved under a relatively mild condition; hematite and goethite which can be directly sold can be obtained; meanwhile, residual acid in the acid leaching solution and acid released in the iron deposition process are recycled; loss of nickel, cobalt, aluminum and magnesium in the leaching solution can not be generated.

The invention relates to a preparation method used for forming an arsenic/fluorine-removing adsorbent, which comprises the following steps of: (a) adding polyvinyl alcohol into water at normal temperature while stirring, raising temperature and stirring to completely dissolve the polyvinyl alcohol, and then cooling to room temperature; (b) adding a carboxylic acid solution into a polyvinyl alcohol solution while stirring, carrying out esterification reaction, and cooling an esterification product solution to room temperature for standby; and (c) adding the esterification product solution intoadsorbent goethite, sulfate aka-ganeiteor ferrihydrite powder and uniformly mixing, extrusion-forming to obtain wet particles, then carrying out crosslinking treatment and drying to obtain an arsenic-removing adsorbent; or adding the esterification product solution into oxyhydroxide powder and uniformly mixing, extrusion-forming to obtain wet particles, then carrying out crosslinking treatment and drying to obtain a fluorine-removing adsorbent. The prepared adsorbent particles have the characteristics of high strength, toughness, less adsorption capacity loss in the forming process without swelling, and the like.