16 results about "Siderite" patented technology

This invention provides a self-trophic denitrification filter media with anti-scaling function and its preparation method. The filter media uses sulfur, magnesite, and a microporous carrier as its main components, supplemented with soluble salts for continuous pore formation, forming a highly efficient self-trophic denitrification filter media with anti-scaling function. This filter media overcomes the problem of scale formation and reduced efficiency when treating high-concentration nitrate wastewater, which is often caused by conventional methods using calcium carbonate as a neutralizing agent. It also overcomes the problems of slow reaction rates and poor filter media activity caused by the inability of filter media prepared using magnesite or siderite to neutralize the generated acid in a timely manner.

This invention discloses an apparatus and process for removing sulfur dioxide from flue gas using siderite slurry, relating to the field of environmental protection technology. The apparatus comprises six major components: desulfurization, slurry circulation, slurry replenishment, oxidation, defoaming emission, and spent slurry treatment. The components are interconnected by pipelines. The process includes siderite pretreatment slurry preparation, slurry replenishment, flue gas desulfurization, sulfite oxidation, flue gas defoaming emission, and spent slurry treatment. Siderite is crushed and ground into a slurry with a specific particle size and solids content, which is then contacted countercurrently with sulfur-containing flue gas. Utilizing ferric carbonate, magnesium carbonate, and calcium carbonate in the slurry as desulfurizing agents, combined with the oxidation effect of air and ferric ions, sulfur dioxide is converted into ferric sulfate and calcium sulfate, achieving desulfurization. This invention has high desulfurization efficiency, with the sulfur dioxide content in the purified flue gas below 50 mg / Nm³. 3 It makes full use of low-grade siderite resources, and the desulfurization by-products can be utilized as resources. The process is simple and has no secondary pollution, resulting in significant economic and environmental benefits.

The present application relates to the technical field of mineral processing, and provides a siderite directional enrichment and separation integrated process, which comprises the following steps: ore pretreatment, ore slurry directional dispersion and selective flocculation regulation, batch flotation separation, product refining and wastewater recycling four links, each link is accurately matched based on mineral surface electrical property and adsorption characteristic parameters, the iron element grade of siderite after flotation can be increased by more than 15%, the highest recovery rate can reach 76.70%, the iron grade can be increased to 59.90% at most, the high-value recovery of low-grade multi-element symbiotic siderite is realized, and the tailing discharge amount is reduced by 15%; the wastewater is closed-loop recycled without external discharge, and the first-level requirement of the comprehensive wastewater discharge standard is met.

The invention discloses an iron oxide ore combined collecting agent and application thereof, and belongs to the technical field of mineral flotation. According to the combined collecting agent, a multi-element mixed coordination field is constructed through dihydroxamic acid and oximido, a stable composite adsorption layer is formed, and meanwhile, a dense hydrophobic layer is constructed on the surface of a mineral through the hydrophobic synergistic effect of a flexible aliphatic chain and a rigid benzene ring. The application of the combined collecting agent in iron oxide ore flotation comprises the steps that after iron oxide ore is smashed and subjected to size mixing, the combined collecting agent and a foaming agent are added, an oxidizing agent can also be added, and concentrate is obtained after air inflation flotation. The combined collecting agent can achieve efficient flotation of ilmenite, hematite and siderite under the mild condition, and has the advantages of being good in selectivity, high in recovery rate, small in dosage and environmentally friendly.

This invention discloses an autotrophic denitrification composite packing material, its preparation method, and its application, belonging to the field of wastewater denitrification technology. The composite packing material disclosed in this invention comprises 40%-70% sulfur, 2%-20% pyrite, 2%-20% siderite, 10%-50% limestone, 3%-20% maifanite, and 1%-3% binder. Its preparation method is as follows: S1. Batching; S2. Raw material crushing; S3. After the crushed sulfur, pyrite, siderite, limestone, and maifanite are mixed evenly, the binder is added, and the mixture is thoroughly mixed to obtain a thickened substance; S4. Granulation. The prepared round granular autotrophic denitrification composite packing material can be widely used in wastewater treatment, featuring high autotrophic denitrification efficiency and strong resistance to shock loads, and can provide a suitable acid-base environment for the growth and reproduction of autotrophic denitrifying bacteria.

The present application relates to a kind of sulfur autotrophic denitrification fillings and its preparation method, belong to the sulfur autotrophic denitrification technical field of river and lake ecological management field, including mass ratio 1:1.2:0.2:0.1:0.01 of A component, B component, C component, D component, E component, the A component includes mass ratio 5:3:1:1 of sulfur powder, siderite powder, thiosulfate and active clay;The B component is alginic acid propylene glycol ester aqueous solution;The C component is the mixture of binder and volatile agent with mass ratio 5:2;The D component is hydrogen sulfide remover, neutralizing agent and digestion agent with mass ratio 5:3:2;The E component is denitrifying sulfur bacteria.The present application is a kind of low-cost treatment technology for sulfur autotrophic denitrification, and biological can use sulfate in water to complete denitrification by itself, without the support of external energy, can significantly reduce cost.

This invention discloses a flotation separation method for Fe / Ti impurities in coal-series kaolinite based on the impurity occurrence state, comprising the following steps: performing process mineralogical analysis on the raw coal-series kaolinite ore, and constructing single-mineral systems accordingly, including a kaolinite mineral system, an iron-bearing mineral system, and a titanium-bearing mineral system; conducting flotation tests and surface property tests on each constructed single mineral under different collector system conditions to obtain the differences in floatability and interfacial properties of each single mineral under different reagent conditions; and determining and implementing the raw ore flotation scheme. This invention, by constructing single-mineral flotation systems of kaolinite, siderite, and rutile, can establish the correspondence between different minerals and different collectors, providing a basis for determining the raw ore flotation scheme and flotation conditions, and improving the targeting of flotation separation.

This invention discloses a sulfur-iron oxide composite denitrification packing, its preparation method, and its application, relating to the field of wastewater treatment technology. The packing comprises: sulfur powder, siderite, magnesite, magnesium oxide, metallic manganese, metallic aluminum, nano-iron, boron sludge, magnetite, and a binder. The total amount of metallic manganese, metallic aluminum, and nano-iron added constitutes 8% to 16% of the mass of the sulfur-iron oxide composite denitrification packing. This invention alleviates the technical problems of insufficient strength and wear resistance, as well as low denitrification efficiency in existing technologies.

This invention discloses a production method, the resulting product, and its application in the field of iron and steel metallurgical technology, which utilizes the waste heat from steel slag for temperature control. The invention calculates the amount of siderite that can be added based on the temperature and mass of the steel slag, then places the siderite on top of the liquid steel slag. It calculates the corresponding slag temperature during slag cooling and adds coke tailings at 1210℃ and 600℃, with the amount of coke added being 5% of the siderite mass. After crushing and cooling, the steel slag is magnetically separated to obtain iron ore. The remaining non-magnetic steel slag is the slagging agent, with calcium ferrite as its effective component. This invention utilizes the absorption of waste heat from steel slag by siderite, combined with temperature control, to efficiently recover waste heat from steel slag and process siderite at low cost. The resulting products are iron ore and a slagging agent that can be directly fed into the furnace, bringing significant economic value to enterprises and making a significant contribution to energy conservation and emission reduction in the steel industry.

The application discloses a method for preparing battery-grade ferrous phosphate solution and recovering copper and graphite by co-leaching of phosphorus iron slag and siderite. The method comprises the following steps: reducing leaching of raw materials including phosphorus iron slag, siderite and elemental iron by using phosphoric acid as a leaching agent, and solid-liquid separation to obtain battery-grade ferrous phosphate solution and leaching residue; and graphite flotation separation of the leaching residue after slurry adjustment to obtain copper-rich tailings and graphite concentrate. The method can selectively recover valuable components in the phosphorus iron slag and the siderite, obtain battery-grade ferrous phosphate solution, and efficiently recover graphite and copper components by the synergistic effect of the phosphorus iron slag and the siderite and by using weakly acidic phosphoric acid as a leaching agent, and the method is simple in process, low in cost and suitable for industrial production.

The present invention provides a method and apparatus (2a) for producing at least one of calcium oxide, magnesium oxide and an iron oxide from an ore comprising a carbonate mineral of at least one of calcium, magnesium and iron, such as limestone and siderite ores. The method comprises producing liquid sodium and chlorine gas by electrolysis. The liquid sodium is oxidised to sodium oxide and the chlorine is used to make hydrochloric acid. The sodium oxide may be produced in a redox reaction with an oxide of another metal to produce the other metal in elemental form as well. The ore is added to the hydrochloric acid to dissolve the carbonate mineral therein, which produces gaseous carbon dioxide and an aqueous solution respectively comprising at least one of calcium chloride, magnesium chloride and ferrous chloride. The carbonate mineral is dissolved in the hydrochloric acid closed off from their surrounding environment and the carbon dioxide is captured. The aqueous solution is reacted with at least some of the sodium oxide, or sodium hydroxide derived therefrom, to produce an aqueous solution of sodium chloride and a precipitate respectively comprising at least one of calcium hydroxide, magnesium hydroxide and ferrous hydroxide. The precipitate is then phase separated from the aqueous solution of sodium chloride and the hydroxide(s) in the separated precipitate are thermally decomposed to produce water vapour and a solid end-product comprising the desired oxide(s). Sufficient heat for this thermal decomposition is transferred to the separated precipitate from at least one of the electrolysis products, the exothermic processes by which the precipitate is produced, their respective products and the products of the thermal decomposition itself. Thus the invention consumes no carbonaceous fuel, including any fossil fuel, and has electricity as its only energy requirement. If the electricity is produced from a source of renewable energy, it produces no greenhouse gas emissions. The apparatus (2a) comprises an electrolytic subassembly (10), a sodium oxide or hydroxide-producing subassembly (13), a hydrochloric acid-producing subassembly (12), a reaction subassembly (14), a solid-aqueous phase separator (16), a kiln (20), and a heat transfer pathway (23) for transferring enough heat to the precipitate in the kiln (20) to cause the thermal decomposition from at least one of: a product of the electrolytic subassembly (10), the other subassemblies (12, 13, 14) and their respective products, and a product of the thermal decomposition. The invention is intended to replace the traditional calcination process, including for the production of cement clinker, and can also be used to convert siderite ores into one or more iron oxides suitable for ironmaking. The captured carbon dioxide may be reacted with a second portion of the sodium oxide, or with sodium hydroxide derived therefrom, to produce sodium carbonate, thereby also providing a replacement for the Solvay process. In some embodiments, the method can even have a negative carbon footprint overall.

The present application relates to a kind of low-grade siderite tailings, brown iron tailing suspension magnetization reduction calcination process, belong to iron ore dressing technical field.The low-grade siderite, brown iron tail suspension magnetization reduction calcination system includes raw material conveying system, raw material preheating system, raw material oxidation calcination and reduction system, finished product cooling system and raw material dust collection and dust return system;Siderite, brown iron tailings powder is transported from conveying system to waste heat system, enters into main calcining furnace and occurs oxidation reaction, then calcined material enters into reducer and occurs reduction reaction, and finished product after reduction enters into cooling system, and the finished product material after cooling is stored, solve the problem that siderite, brown iron tailings powder low-grade magnetite oxide content is low, grade is low and cannot be produced and utilized.

The application discloses a hydrogen production and suspension magnetization roasting coupling device and method, which comprises a hydrogen production device, a suspension magnetization roasting device and a coupling connection assembly. The device generates reducing gas with carbon monoxide and hydrogen as effective components through oxidation reaction under pressurized non-catalytic conditions, so that hematite, limonite and siderite are converted into magnetite or maghemite which is strongly magnetic under the condition of reducing agent atmosphere, and then high-grade and high-recovery iron concentrate is obtained through magnetic separation, thereby realizing efficient utilization of resources. The process flow is short, load increase and decrease is convenient, operation flexibility is large, the hydrogen production system and the hydrogen-based mineral phase conversion system are highly fused and coupled, raw materials are wide, gas production is low in cost, low-carbon environmental protection, heat energy recycling rate is high, and the application scope is wide, and the like, thereby providing a new way for effective development and utilization of refractory ore resources.

The utility model relates to the technical field of arsenic-cadmium-containing wastewater treatment, and discloses an arsenic-cadmium-containing wastewater treatment device which comprises a sedimentation tank and a detection tank, and an adsorption tank is connected between the sedimentation tank and the detection tank; the upper end of the sedimentation tank is connected with a conditioning tank, a stirring device and a filter screen are arranged in the sedimentation tank, a motor for driving the stirring device is arranged at the top of the sedimentation tank, and a cabin door is arranged on the side surface of the sedimentation tank; a plurality of siderite filtering layers are arranged in the adsorption tank, and the particle sizes of the siderite filtering layers are gradually reduced from top to bottom; and the upper end of the detection pool is connected with a second comprehensive water quality analyzer. According to the arsenic-cadmium-containing wastewater treatment device, the removal rate of heavy metals in wastewater is increased, the blockage of the whole device is avoided to a great extent, the sewage treatment effect is ensured, the working efficiency of the whole device is high, the labor amount of workers is reduced, and the cost is reduced.

A design method for acidizing clay-type shale reservoirs is presented. The technical approach is based on the characteristics of clay-type shale reservoirs and lithology, fully leveraging the advantages of bedding planes to maintain the rock framework, clear bedding planes, and connect pores while simultaneously preventing swelling and promoting large-scale acidizing. The design method uses quartz, feldspar, and clay minerals as the rock framework, primarily incorporating calcite, dolomite, siderite, and pyrite from dissolved bedding planes. A bedding plane acidizing injection parameter design method is established, using the portion of HCl-soluble rock on the dissolved bedding planes as the basis for dosage design. The upper limit for injection pressure is defined as reservoir fracturing, and the upper limit for injection volume at this pressure is also defined. The overall goal is to achieve deep acid treatment, forming effective acid etching trenches to improve bedding permeability and thus transforming clay-type shale reservoirs. This invention has achieved good oil production and fluid increase results in field trials during shale oil development.

The invention provides a beneficiation method for recovering copper, cobalt, mica and barite from Dazichi siderite tailings, and belongs to the field of flotation of mineral processing engineering. Firstly, copper-sulfur bulk concentrate is obtained through copper-sulfur flotation, and then copper-sulfur separation is conducted to obtain copper-cobalt concentrate and sulfur concentrate; and after the copper-cobalt concentrate is subjected to pH adjustment, oxidation and selective inhibition, cobalt-copper concentrate and copper concentrate are separated out. After the copper-sulfur scavenging tailings are subjected to reagent removal pretreatment, mica concentrate is recovered through flotation under the acidic condition. And finally, recycling barite concentrate from mica flotation tailings through reselection. According to the method, the total copper recovery rate can reach 85% or above, the recovery rate of cobalt in the pre-enriched tailings is not lower than 75%, mica and barite concentrate can further meet the high-end industrial application quality requirement, and the technical problems that multiple valuable components of the tailings are difficult to synergistically recover, and resources are wasted are effectively solved.