42 results about "Schwertmannite" patented technology

The invention belongs to the field of environmental engineering and discloses granular Schwertmannite and its preparation method and use. The granular Schwertmannite comprises particles which are prepared by loading specific carriers with NaOH solution-modified biogenic Schwertmannite on carrier surfaces and have an average particle size of 4.06mm. The surface of the granular Schwertmannite is covered with reddish-brown Schwertmannite so that the granular Schwertmannite can maximumly contact with pollutants and can resist flow-velocity dynamic water flow impact. The surface of each zeolite is loaded with about 3.7mg of Schwertmannite so that mineral high-adsorption performances can be maximumly used. The granular Schwertmannite has a pellet shape and is convenient for As recovery and regeneration.

The invention discloses Schwertmannite for simultaneously removing pollution of As (III) and Cr (VI). The preparation method comprises the following steps: heating deionized water to 50-70 DEG C; thenadding FeCl3.6H2O and Na2SO4 and stirring the mixture to uniformity; then performing heat preservation and stirring on mixed solution for 5-20 min, cooling a precipitate formed in the reaction to theroom temperature and then transferring the precipitate into a dialysis bag; and dialyzing the precipitate for 5-10 days until the conductivity is lower than 100 [mu]s / cm, and performing centrifugal drying to prepare the powder with the specific surface area being 100-300 m<2> / g. The Schwertmannite has a good removal effect on arsenic and chromium in an As (III) and Cr (VI) binary pollutant coexistence system, and the removal shows a redox-adsorption combined effect, so that the toxicity of two pollution elements can be further reduced while the concentrations of arsenic and chromium in a water body are reduced.

A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins. This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.

The invention relates to a preparation method of triazine ramification inserting layer laminated clay heavy metal catching agent and an application. The preparation method comprises the steps of firstly displacing potassium ions in laminated clay by using inorganic acid or quaternary ammonium salt under certain temperature and certain concentration of a displacer; carrying out intercalation on the laminated clay of the potassium ions after displacing, carrying out reaction on the primary amine in the laminated clay after intercalation and cyanuric chloride, and thus preparing triazine intercalation ramification ramification layer laminated clay; carrying out reaction on the triazine intercalation ramification ramification layer laminated clay and sodium sulfide so as to obtain sulfhydrylation triazine ramification inserting layer laminated clay heavy metal catching agent. The sulfhydrylation triazine ramification inserting layer laminated clay is singly applied in heavy metal sewage treatment or is applied by combining with the existing schwertmannite and has remarkable effect. The preparation method of the triazine ramification inserting layer laminated clay heavy metal catching agent and the application provided by the invention have the outstanding characteristics that compared with the existing processing agent, the removal rate of ions such as heavy metal lead, arsenic and cadmium in the water can achieve more than 96.3% without filtering, and the purposes that the labor is saved and the time is saved are achieved in the industrial application of processing the sewage containing heavy metal.

The invention relates to complete equipment using zero-valent iron to reduce and couple microorganisms to prepare Schwertmannite. The complete equipment comprises a biological oxidizing unit (1) and areducing unit (2) and is characterized in that the biological oxidizing unit (1) comprises an oxidizing area (11) and an oxidizing settling area (12); the reducing unit (2) comprises a reducing area(21) and a reducing setting area (22); the oxidizing area (11) uses Fe<2+> to produce the Schwertmannite; the oxidizing settling area (12) can perform solid-liquid separation; the reducing area (21) receives Fe<3+>-rich liquid and zero-valent iron from the oxidizing settling area (12) and allows Fe<3+> and the zero-valent iron to contact sufficient to generate Fe<2+> through reduction; the reducing setting area (22) can perform solid-liquid separation, and the separated Fe<2+>-rich liquid flows back to the oxidizing area (11) to participate in Schwertmannite production. The complete equipmentcan increase the yield of the Schwertmannite and can achieve continuous large-scale production.

The invention provides a method for preparing hydroxy ferric sulfate slurry-based charcoal. The method comprises the following steps: (1) adjusting the pH value of a conventional municipal sludge solution with sulfuric acid to separate internal iron in sludge; (2) inoculating acidithiobacillus ferrooxidans into the sludge, wherein hydroxyl ferric sulfate sludge is formed from the acidithiobacillus ferrooxidans by utilizing the internal iron in the sludge; (3) dehydrating the hydroxyl ferric sulfate sludge, and drying; and (4) grinding and screening the dried sludge, and pyrolyzing the screened sludge in N2 protection. The hydroxy ferric sulfate slurry-based charcoal formed by pyrolysis contains schwertmannite which has an efficient and specific adsorbing effect on arsenic. The hydroxy ferric sulfate slurry-based charcoal has the advantages that hydroxyl ferric sulfate is generated by utilizing internal iron in sludge, and cost is reduced; the prepared hydroxy ferric sulfate slurry-based charcoal can be used for efficiently specifically adsorbing arsenic in sludge, so that the sludge resource is utilized, and a novel arsenic adsorbent is provided.

The invention discloses molybdenum disulfide modified schwertmannite and a preparation method and application thereof, and belongs to the technical field of water treatment. The molybdenum disulfide modified schwertmannite contains Fe < 2 + > and Fe < 3 + >, the amount of Fe < 2 + > and the amount of Fe < 3 + > are measured through XPS, and the mass ratio of Fe < 2 + > to Fe < 3 + > is not lower than 1.90; meanwhile, the molybdenum disulfide modified schwertmannite contains 1T-phase molybdenum disulfide; and Fe-Mo-S bonds are formed between molybdenum disulfide and schwertmannite, and the catalytic activity is good.

The invention discloses a synthesis method and application of Schwieterman stone, and belongs to the technical field of water treatment. The synthesis method of the Schwieterman stone comprises the following steps: (1) adding FeSO4.7H2O to an aqueous solution with a pH value of 2-7, performing even stirring, then adding H2O2, and then performing vibration treatment so as to form a precipitate; and(2) performing filtration and collection on the precipitate, performing washing with an acidic solution, and then conducting washing with deionized water, and performing vacuum freeze drying so as toobtain the solid catalyst Schwieterman stone. The yield of the Schwieterman stone prepared by using the method is high. When the prepared Schwieterman stone is used as a heterogeneous Fenton reactioniron-based material for Fenton-like oxidation reaction treatment on tetracycline, tetracycline in water can be removed effectively and efficiently, no secondary pollution to the environment is caused, the operation is simple, and the cost is low; and therefore a good application prospect is achieved in degradation of tetracycline pollutants in water.

The present invention provides the biosynthesis of Schwertmannite as high efficiency adsorbent and its usage in adsorbing to eliminate Cr(VI) and As from waste water and underground water. Schwertmannite is prepared with ferrous sulfate as reactant, deionized water as reaction medium and Thiobacillus ferrooxidans LX5 as catalytic oxidant, and through stirring for 1-3 days, filtering to collect precipitate, washing with sulfuric acid acidified deionized water, washing with deionized water and stoving. Schwertmannite is added into water to be treated in the amount of 0.5 wt% or 0.02 wt%, dilute nitric acid is added into Cr(VI) containing system to regulate the pH value to 5.0-7.0 or sodium hydroxide is added into As containing system to regulate the pH value to 6.0-10.0, and the system is stirred for 3 hr and filtered to eliminate Cr(VI) and As. Schwertmannite has maximum adsorption amount on Cr(VI) and As of 55 mg / g and 65 mg / g separately.

The invention discloses a composite stabilizing reagent for dearsenization residues. The composite stabilizing reagent for dearsenization residues comprises 20-50 wt% of FeS, 10-40 wt% of Fe2O3, 10-40wt% of FeSO4 and 20-50 wt% of Schwertmannite. The composite stabilizing reagent of the invention reacts with the dearsenization residues to obtain stabilized arsenic-containing minerals, has low toxicity leaching concentration, and can be stably stockpiled in strong acid-basic and strong reducing environments.