33 results about "Goethite" patented technology

To identify iron ore having high dephosphorization efficiency by a reduction heat treatment method.SOLUTION: The present invention relates to a method for sorting iron ore that facilitates removal of phosphorus by a reduction heat treatment technique, the method including an X-ray diffraction measurement step of performing X-ray diffraction measurement on the iron ore. The iron ore is determined to be more easily subjected to phosphorus removal by the reduction heat treatment technique as a shift, relative to a goethite reference peak, of at least one peak attributed to goethite observed in an X-ray diffraction pattern becomes larger.SELECTED DRAWING: Figure 1A

The invention provides a goethite composite treatment agent and a preparation method and application thereof. The goethite composite treating agent is composed of goethite, MnO and Mn2O3, the ammonia nitrogen oxygenase activity of ammoxidation microorganisms is improved in the sludge composting process, and then the ammonia loss and nitrogen volatilization of compost products are reduced. Straws are also added into the sludge to increase the oxygen content in the composting process of the sludge. In addition, the iron ore, the manganese oxide and the component mixing proportion in the goethite composite treating agent are screened, and the adding amount of the goethite composite treating agent and the straw in the sludge composting process and the moisture content and the aeration rate of a pile body are screened. The sludge composting method provided by the invention has the advantages of simplicity in operation, high treatment efficiency, good effect and the like, is suitable for large-scale high-quality preparation of sludge composting products, is suitable for large-scale application, and solves the problems of serious nitrogen loss, large emission of harmful nitrogen gas and the like in the existing sludge aerobic composting.

The invention provides a preparation method of goethite-boron complex minerals for soil improvement, and belongs to the technical field of preparation of artificial minerals for soil improvement, the preparation method comprises the following steps: 1, mixing solutions; 2, stirring the mixed solution; 3, dropwise adding a sodium hydroxide solution; step 4, centrifugal washing; 5, drying the precipitate; and 6, grinding and screening. According to the goethite-boron composite artificial mineral prepared through the method, the boron loss rate is reduced, the boron slow release performance is improved, the ecological environment effect is improved, the boron fertilizer utilization efficiency is improved, iron nutrition is synchronously provided, and the iron deficiency symptom of calcareous soil is relieved.

The application discloses a ferrihydrite-humic acid-silicon dioxide composite material and a preparation method and application thereof, and belongs to the technical field of heavy metal pollution remediation materials. The composite material is prepared by compounding ferrihydrite, humic acid and silicon dioxide in a mass ratio of 8:1:(0.25-1) through a coprecipitation method. The core of the application is that the silicon dioxide is introduced as a skeleton, which effectively prevents the agglomeration of ferrihydrite particles, optimizes the distribution of humic acid, solves the problem of adsorption site competition in a binary composite material, and realizes the synergistic effect of the three. The composite material has the characteristics of large specific surface area, rich functional groups and good stability, exhibits high efficient synchronous adsorption capacity for anionic arsenic and cationic cadmium in water, has large adsorption capacity and fast rate, and is particularly suitable for efficient remediation of arsenic and cadmium composite pollution environment.

The invention discloses an environmental micro-plastic photodegradation method based on goethite catalysis, which belongs to the technical field of environmental protection, and comprises the following steps: (1) preparing a Fe (NO3) 3 solution; (2) dropwise adding the KOH solution into the Fe (NO3) 3 solution until yellowish-brown colloid appears, and adjusting the pH value of the system to 11.8-12.2; (3) carrying out aging treatment on the obtained mixed solution; (4) taking out the precipitate obtained by the reaction, dialyzing and cleaning until the pH value of the supernate is reduced to 9.0; (5) freeze-drying the washed precipitate, grinding and sieving; and (6) blending the sieved goethite catalyst with micro-plastics, and degrading under an illumination condition. The whole preparation method is simple and convenient, mild in condition and easy for large-scale production; the prepared goethite can significantly accelerate the photochemical degradation rate of PS plastic.

The present application relates to the technical field of goethite, and provides a goethite, a preparation method and application, the preparation method comprises the following steps: S1, coarse crushing of limonite, sieving, to obtain a coarse crushing sample; S2, fine crushing and grading sieving, to obtain a plurality of batches of fine sieving samples; S3, heating and heat preservation of the fine sieving samples; S4, magnetic separation of the fine sieving samples, and weakly magnetic hematite and strongly magnetic substances are extracted together; S5, repeating steps S3 and S4 until the content of the remaining magnetic substances is within a set threshold; S6, cooling the fine sieving samples to below the Neel temperature of goethite, and then performing magnetic separation again to separate goethite. The present application has the advantages of large processing capacity, high processing efficiency, continuous production, and significantly reduced difficulty in obtaining goethite. In addition, compared with the traditional hydrothermal synthesis method, the present application removes the use of chemical products, effectively reducing the environmental problems in the production process of goethite.

The invention relates to a leaching and iron removing method for zinc smelting cobalt slag, and belongs to the field of smelting slag valuable metal recovery. The method comprises the following steps: (1) controlling the leaching pH value to be 3.0-4.0, leaching Co, Zn, Cd and Cu, and precipitating iron in the form of goethite; (2) the pH value is reduced, copper is deeply leached, and compressed air is introduced in the leaching process; and (3) liquid-solid separation. In the step (2), the deep leaching of the copper is realized, meanwhile, the goethite generated in the step (1) cannot be dissolved, and the precipitation of iron and the efficient leaching of Co, Zn, Cd and Cu can be completed in one reaction tank, so that the equipment investment and the operation cost are saved, and the leaching process of the cobalt slag is greatly shortened. The copper content of the obtained lead slag is greatly reduced, in the subsequent lead smelting process, the loss of lead, silver and gold caused by lead matte entrainment is effectively reduced, and the economic benefit of lead smelting is improved.

The invention provides a dual-pore-forming iron-carbon composite filler for strengthening Feammox-NDFO autotrophic nitrogen removal and a preparation method thereof, and relates to the technical field of sewage organism autotrophic nitrogen removal, the dual-pore-forming iron-carbon composite filler comprises the following raw materials by weight: 30-45 parts of iron-containing powder, 15-30 parts of charcoal powder, 20-30 parts of an adhesive, and 10-15 parts of a pore-forming agent. The iron-containing powder is one or a combination of iron sesquioxide (Fe2O3), iron phosphate (FePO4), goethite (FeO (OH)) and ferric citrate; the pore-forming agent is sodium bicarbonate; the invention relates to a preparation method of a dual-pore-forming iron-carbon composite filler for strengthening Feammox-NDFO autotrophic nitrogen removal. The preparation method specifically comprises the following steps: 1, pretreating raw materials; 2, mixing and granulating; 3, steam curing and pore forming are carried out, wherein the curing temperature is 60-80 DEG C; the humidity is 80-90% RH; 4, ultrasonic-assisted deionized water soaking and pore forming are carried out, and the soaking temperature is 30-50 DEG C; the time is 6-12 hours; the ultrasonic frequency is 20-40 kHz. And 5, screening a finished product. The filler disclosed by the invention has the beneficial effects that the filler is mainly applied to a low-carbon sewage condition that C / N is less than or equal to 0.5, efficient denitrification can still be kept under the low-carbon condition, and the TN removal rate can reach 91.6-97.8%.

This invention discloses a method and reaction system for removing iron and organic matter from goethite using ultrasound, belonging to the field of hydrometallurgical technology. The method includes the following steps: pretreatment of the leaching solution from hydrometallurgical zinc smelting by filtering and then pumping it into an ultrasonic reaction vessel; starting the ultrasonic system and adjusting the frequency to 20-80 kHz and the sound intensity to 0.5-5.0 W / cm². 2 Simultaneously, an oxidant is introduced; at a set temperature, a neutralizing agent is continuously added to the ultrasonic reactor to maintain the system pH at 3.5-5.0, with a total reaction time of 20-240 minutes. The ultrasonic field is kept on during the reaction, causing iron to precipitate directionally as α-FeOOH, while organic matter is simultaneously mineralized or adsorbed and encapsulated by goethite and co-precipitated. After aging, the slurry is concentrated and filtered to obtain iron-rich goethite slag and purified liquid. This invention enhances the goethite precipitation process through the cavitation effect, microjets, and Fenton reaction of ultrasound, thereby improving iron removal efficiency and organic matter degradation rate.

The present invention provides a method for metallurgical iron removal using a Venturi reactor, which belongs to the field of hydrometallurgical technology. The method for metallurgical iron removal using a Venturi reactor provided by the present invention can improve Fe 2+ Fe 3+ The speed of conversion, as well as the energy required for the formation and growth of goethite nuclei, enhance the washing effect of non-ferrous ions in goethite slag. Therefore, the method provided by the present invention is not only conducive to improving the purity of goethite, but also can reduce the loss of rare earth due to inclusion. No new impurities are introduced in the goethite method iron removal process adopted by the present invention, which reduces the difficulty and cost of subsequent impurity removal and improves the comprehensive recovery efficiency. At the same time, the goethite method proposed by the present invention requires a simple reaction device and mild reaction conditions, which is easy to realize industrial application.

The invention discloses a ferrihydrite-humic acid-silicon dioxide composite material as well as a preparation method and application thereof, and belongs to the technical field of heavy metal pollution repair materials. The composite material is prepared by compounding ferrihydrite, humic acid and silicon dioxide according to the mass ratio of 8: 1: (0.25-1) through a coprecipitation method. The core of the invention lies in that silicon dioxide is introduced as a framework, ferrihydrite particles are effectively prevented from being agglomerated, distribution of humic acid is optimized, the problem of competition of adsorption sites in a binary composite material is solved, and synergistic interaction of the three is realized. The composite material has the characteristics of large specific surface area, rich functional groups and good stability, shows high-efficiency synchronous adsorption capacity on arsenic in an anionic form and cadmium in a cationic form in a water body, is high in adsorption capacity and high in speed, and is particularly suitable for high-efficiency repair of an arsenic and cadmium combined pollution environment.

This invention relates to a method for the resource recovery of rare earth, thorium, and iron from iron-thorium slag. The method includes the following steps: (1) finely grinding the iron-thorium slag; (2) uniformly mixing the finely ground iron-thorium slag with reducing carbon powder, and then roasting them together in a muffle furnace to obtain roasted slag; (3) mixing the roasted slag with alkaline solution and then placing it in a sealed container for high-temperature alkaline conversion reaction to obtain alkaline conversion slag; (4) washing the alkaline conversion slag with water to remove fluoride and aluminum, and then filtering and drying it to obtain water-washed slag; (5) subjecting the water-washed slag to acid dissolution reaction, and after separation, obtaining a thorium-containing rare earth solution and an acid-leached slag respectively; (6) after deep impurity removal, transferring the thorium-containing rare earth solution to an extraction system to separate and purify rare earth and thorium elements. This invention solidifies most of the iron in the iron-thorium slag in the form of goethite through high-temperature roasting, avoiding the loss of rare earth caused by the subsequent leaching process, and has the advantages of high rare earth recovery rate, low slag rate, and low auxiliary material consumption.

The present application relates to a kind of quantitative determination mixed system microplastic and the spectroscopy method of organic matter content, comprising: the establishment of initial NOM and PSMPs system or the establishment of NOM-F and PSMPs system after goethite adsorption, the initial NOM and PSMPs system includes HA or FA and PSMPs binary system and HA, FA and PSMPs ternary system;The NOM-F and PSMPs system after goethite adsorption includes HA-F or FA-F and PSMPs binary system and HA-F, FA-F and PSMPs ternary system.This method is according to the difference of different types of organic matter and microplastic ultraviolet-visible light absorption spectrum, using spectroscopy distinguishes and then quantifies respective content, this method is easy to operate, test cost is low, especially for the small particle size microplastic and organic matter system that is difficult to separate by centrifugation or filtration etc.It has good quantitative measurement effect.

The application belongs to the field of environmental protection and discloses a composite soil modifier for improving the cadmium fixation capacity of soil aggregates and a soil cadmium fixation method. The composite soil modifier comprises straw, montmorillonite and goethite, and the weight ratio of the straw, the montmorillonite and the goethite is 1-3:1-3:1-3. After the modifier is dispersed into soil, it can increase the residual Cd content of soil aggregates with a particle size of less than 0.053 mm and can optimize the cadmium fixation effect of the straw as a cadmium fixation material in a traditional scheme.

The application relates to the field of geology and mineral resources, and discloses a detection analysis and ore-prospecting indication method of altered minerals in a granite-type uranium deposit, in particular to the identification of widely developed'reddening' altered material components in the Mianhuakeng uranium deposit in the north of Guangdong and the research on the ore-prospecting indication significance of the uranium deposit. Through polarization microscope, scanning electron microscope, laser Raman, electron probe and LA-ICP-MS and other technologies, it is found that the'reddening' material in the Mianhuakeng uranium deposit is mainly composed of hematite, goethite and a small amount of magnetite. The research finds that different forms of hematite are closely related to the enrichment degree of uranium, the self-morphology-hemihedral hematite is rich in uranium mineral inclusions, and the disseminated hematite contains uranium in the form of adsorption. The application provides a theoretical basis for granite-type uranium ore prospecting, and in particular, the crystallization form and element geochemical characteristics of iron oxides (hydroxides) are used to predict the uranium mineralization potential.

The invention relates to a doped goethite nanoparticles for regenerative adsorption, a method for regenerative adsorption of moieties comprising phosphorous and / or arsenic, use of said doped goethite nanoparticles, and an aqueous stream treated with said method. The doped goethite nanoparticles for regenerative adsorption comprising iron and a different transition metal, wherein proportionally to iron, the different transition metal is present in the doped goethite in the atomic percentage range of 1% at to 20% at doping.

To newly develop and provide a method capable of correctly evaluating goethite contained in nickel oxide ore or the like used as raw material ore of nickel and cobalt.SOLUTION: A method for evaluating a sample, comprising: correcting an MLA value obtained by a mineral element separation and analysis device (MLA) using analysis data obtained by a different method other than the MLA; and evaluating a goethite content of the sample.SELECTED DRAWING: Figure 1

There is provided a method of producing iron oxide pellets having a target internal energy measured as a target heat of magnetite equivalent (HME). An iron oxide is reduced into an exothermic iron compound having a lower oxidation number. The exothermic iron compound is magnetite, wustite, and / or metallic iron and is mixed with iron ore, a binder and optionally a carbon material selected from coke breeze, anthracite and biomass. The iron ore comprises magnetite and / or hematite and / or goethite. The mixture contains at least 1 wt. % of the exothermic iron compound and from 0 to 0.8 wt. % of total carbon. The mixture contains a sufficient amount of magnetite, wustite, and / or metallic iron to maintain the target HME calculated as follows:target⁢ HME=CV⁢ of⁢ CMCV⁢ of⁢ mag⁢(wt. %⁢ of⁢ CM)+wt. %⁢ of⁢ mag+CV⁢ of⁢ wusCV⁢ of⁢ mag⁢(wt. %⁢ of⁢ wus)+CV⁢ of⁢ FemetalCV⁢ of⁢ mag⁢(wt. %⁢ of⁢ Femetal)where CM stands for carbon material, CV stands for calorific value, wus iswustite, mag is magnetite, and Femetal is metallic iron;The iron pellets are formed from the mixture, dried and subjected to an induration process.

To provide: powder containing iron oxide having high hydrogen sulfide adsorption capability while effectively using pit wastewater discharged from suspended or abandoned mines; a hydrogen sulfide adsorbent using the powder containing iron oxide; and a method for manufacturing the powder containing iron oxide.SOLUTION: Powder containing iron oxide includes goethite as a main component, and has a volume-based mean particle diameter of 1 μm or more and 50 μm or less, and a specific surface of 80 m2 / g or more and 500 m2 / g or less. S / Fe is 0.05 or less in terms of an element weight ratio.SELECTED DRAWING: None

The invention discloses a preparation method and application of a KGA adsorbent, and the preparation method of the KGA adsorbent comprises the following steps: carrying out primary ultrasonic uniform stirring on kaolinite and water, standing, and carrying out secondary ultrasonic uniform stirring to obtain a suspension; adding a FeCl3 solution into the suspension, and stirring to obtain a goethite mixed solution; adding a regulator into the goethite mixed solution to regulate the pH to weak acidity, adding a reducing agent to regulate the pH to weak acidity, aging at constant temperature, centrifuging, washing with water, drying and grinding to obtain the KGA adsorbent. The method is low in material cost, environmentally friendly, free of secondary pollution and easy and convenient to operate, and an efficient new way is provided for in-situ remediation of organic pollutants such as glyphosate in soil and sediments. The adsorbent KGA is prepared from goethite and kaolinite, so that efficient, low-consumption and environment-friendly adsorption and degradation of glyphosate are realized. KGA is used as a glyphosate adsorbent. The adsorption capacity is improved to 2.67 times through the synergistic effect of KGA, and the KGA has catalytic activity and provides a better solution for sediment repair.

To provide a method for recovering rare earth elements from rare earth raw materials containing rare earth elements. [Solution] The present invention relates to a method for recovering rare earth elements from rare earth raw materials, comprising the steps of alkali treatment of a mixture of a reducing agent containing a reducing metal with a standard reduction potential lower than that of goethite and the rare earth tailings, and leaching the rare earth elements from the alkali-treated mixture using a eutectic solvent, wherein the rare earth raw material contains 10% by weight or more of goethite.

The invention provides a preparation method of artificial humic acid, which comprises the following steps: by taking a humus precursor as a raw material, adding isomorphous substituted manganese goethite prepared by a coprecipitation method, reacting at room temperature, washing a reaction product with hydrochloric acid and deionized water, and drying to obtain the artificial humic acid, the preparation method is simple, low in energy consumption and easy to scale, complex and expensive instruments are not needed, the problems of high energy consumption and large equipment size limitation in preparation of artificial humic acid by a hydrothermal method are solved, the prepared humic acid has a remarkable plant growth promoting effect, the dye and heavy metal adsorption capacity of the humic acid is superior to that of commercial humic acid, and the humic acid has a wide application prospect. The method also has great application potential in the aspect of pollutant adsorption.

The application provides a Rhodopseudomonas palustris SX2 and an application thereof, an iron oxidation method, a composition and a culture, and belongs to the technical field of environmental microorganisms. The strain is preserved in the China General Microbiological Culture Collection Center, and the preservation number is CGMCC No. 38191. The strain can efficiently oxidize free state and organic combined state Fe(II) under anaerobic light conditions, especially has stronger oxidation capacity for the organic combined state Fe(II), and the oxidation process is coupled with cell growth and inorganic carbon fixation; the photo-iron oxidation product is goethite short-range ordered nanocrystalline state iron mineral, and the iron minerals formed under different iron forms are different in spatial distribution and particle size. The Rhodopseudomonas palustris SX2 provided by the application provides a microbial material with excellent performance for environmental remediation, iron resource, sewage treatment and divalent iron pollution treatment.

This invention discloses an iron removal process and its application, belonging to the field of non-ferrous metal hydrometallurgy. This process removes Fe from iron-containing solutions. 3+ Reduced to Fe 2+ A reduced iron-containing solution was obtained; after adjusting the pH of the reduced iron-containing solution, an oxidant was added to maintain the Fe content. 3+ The concentration of the ferrous sulfate is 2.0–8.2 g / L. Sulfate is then added to carry out the pyrite removal reaction. After solid-liquid separation, pyrite slag and the first iron-removed liquid are obtained. This method can control the formation rate of the pyrite slag, which is beneficial to reducing the loss rate of valuable metals. This invention further combines the goethite method and hydrothermal method for iron removal, resulting in high iron removal efficiency and low loss rate of valuable metals.

The present invention discloses a low-loss oriented BaM hexagonal ferrite material covering the sub-6 GHz band and a preparation method thereof, based on Co with uniaxial anisotropy 2+ and Ru 4+ ion-combined substituted BaM hexagonal ferrite material, using goethite powder with a high aspect ratio synthesized by the hydrothermal method as a raw material to replace the iron red (Fe2O3) required in the traditional ferrite preparation process, enabling the Co 2+ / Ru 4+ ion-combined substituted BaM hexagonal ferrite to achieve oriented preferred growth, thereby greatly increasing the magnetic resonance frequency and meeting the requirements of the low-loss sub-6 GHz miniaturized antenna for a high operating frequency. Secondly, by adding low-melting-point Bi2O3, the particle size and magnetic domain width are increased, which can reduce the domain wall resonance relaxation frequency, resulting in an obvious separation between the natural resonance point and the domain wall resonance point, ensuring the low magnetic loss characteristics of this material.

The application belongs to the field of soil improvement, and relates to a method for applying a modifier for soil acidification in southern forests, by which goethite as a mineral modifier can effectively increase soil pH, adjust soil acidity, improve soil carbon sink capacity, comprehensively improve the plant habitat, and further promote plant growth, so as to simultaneously realize soil habitat improvement and ecological function improvement of the southern forests.

The invention relates to the technical field of chemical metallurgy, in particular to a method for treating a high-arsenic copper-containing material. The method comprises the following steps: S1, carrying out acid leaching on the copper smelting slag and the white smoke dust, and carrying out solid-liquid separation to obtain acid leaching slag and acid leaching liquid; s2, mixing the pickle liquor with arsenic sulfide slag, performing copper deposition reaction, and performing solid-liquid separation to obtain copper deposition slag and liquid after copper deposition; s3, carrying out oxygen pressure leaching on the copper deposition post-solution, and carrying out solid-liquid separation to obtain oxygen leaching residues and an oxygen leaching solution; s4, mixing the oxygen immersion liquid with the soot of the steel mill, stirring until the pH value is 5-5.4, and carrying out solid-liquid separation to obtain goethite slag and iron-removed liquid; wherein the goethite slag obtained in the step S4 is returned to the oxygen pressure leaching process in the step S3, and the oxygen pressure leaching conditions are as follows: the temperature is 150-170 DEG C, the pressure is 1-1.4 MPa, the oxygen partial pressure is 0.5-0.8 MPa, and the time is 3-4 hours.

The invention belongs to the field of environmental protection, and discloses a composite soil conditioner for improving soil aggregate cadmium fixation capability and a soil cadmium fixation method, and the composite soil conditioner comprises straw, montmorillonite and goethite; the weight ratio of the straw to the montmorillonite to the goethite is (1-3): (1-3): (1-3). After the modifier is dispersed into soil, the content of residual Cd in soil aggregates with the particle size being smaller than 0.053 mm can be increased, and the cadmium fixing effect of taking straw as a cadmium fixing material in a traditional scheme can be optimized.

The present disclosure relates to a method for recovering rare earth elements from rare earth raw materials, the method including steps of: alkali-treating a mixture of a reducing agent including a reductive metal having a lower standard reduction potential than goethite and the rare earth raw materials; and leaching the rare earth elements from the alkali-treated mixture using a deep eutectic solvent, wherein the rare earth raw materials include 10% by weight or more of goethite.

The invention discloses a method for treating copper-containing high-arsenic hazardous waste and application of the method, and relates to the technical field of chemical metallurgy. The method comprises the following steps: carrying out acid leaching on the white smoke dust, and carrying out solid-liquid separation to obtain acid leaching residues and an acid leaching solution; adding goethite slag into the acid leaching solution to carry out first reaction to obtain arsenic-iron leaching slag and first reaction solution; iron powder is added into the first reaction liquid for second reaction, and copper slag and second reaction liquid are obtained; and adding steel mill soot and an oxidizing agent into the second reaction liquid to carry out third reaction to obtain goethite slag and iron-removed liquid. When the method is used for treating the copper-containing high-arsenic hazardous waste white smoke dust, only one kind of arsenic acid iron slag is generated and piled, other filter residues are even and can be sold in a pricing mode, and the method has good application prospects in the aspects of efficient recycling of valuable metal and high-value utilization of the white smoke dust.