15 results about "Goethite" patented technology

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.

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.

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 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 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

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 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.

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 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 relates to the field of garbage treatment, in particular to a method for hydrothermally synthesizing goethite from garbage incineration fly ash and application of the method. The synthesis method comprises the following steps: step 1, preparing a strong alkali solution, and transferring the strong alkali solution into a polytetrafluoroethylene reaction lining; step 2, weighing an iron source and the waste incineration fly ash, adding the iron source and the waste incineration fly ash into a strong alkali solution, and uniformly stirring; step 3, transferring the lining into a hydrothermal reaction kettle, transferring the reaction kettle into a drying oven, and carrying out hydrothermal reaction; and step 4, performing centrifugal treatment on a product after the hydrothermal reaction, separating out a solid-phase product, and drying to obtain goethite. According to the method, resource utilization of the iron-containing raw materials and the heavy metal waste can be achieved. According to the method, iron-containing waste or minerals can be directly used as an iron source and converted into goethite products with high additional value in the hydrothermal reaction, meanwhile, heavy metal is stabilized in a mineral phase, waste is turned into wealth, consumption of iron resources is reduced, and a new material and a new way are provided for heavy metal pollution treatment.