20 results about "Bauxite tailings" patented technology

At least one embodiment of the invention provides a preparation method of sponge titanium, which comprises the following steps: pretreating bauxite tailings to obtain a first mixture; carrying out acid treatment on the first mixture, and filtering to obtain a second mixture; putting the second mixture into a reaction kettle containing an alkaline substance to react so as to convert the ferric titanate into titanate and ferric oxide or ferrous hydroxide to obtain a third mixture; carrying out suction filtration treatment on the third mixture to obtain a first solid phase and a first liquid phase, and drying and grinding the first solid phase; roasting the dried and ground first solid phase to form an iron elementary substance, and carrying out magnetic separation to remove the iron elementary substance; adding an acidic material into the first liquid phase for reaction to obtain metatitanic acid colloid, and washing the metatitanic acid colloid; the metatitanic acid colloid is subjected to calcination, chlorination reaction and replacement reaction in sequence to obtain the sponge titanium. The sponge titanium obtained through the preparation method is high in purity.

The invention relates to the technical field of oil exploitation of low-permeability oil reservoirs, and particularly discloses a composition for a ceramsite proppant, the ceramsite proppant and a preparation method and application of the ceramsite proppant, and the composition for the ceramsite proppant contains manganese dioxide powder, bauxite tailings and fly ash in a mass ratio of 1: (20-40): (5-10). The bauxite tailings contain the following components in percentage by weight: 35.0 to 45.0 percent of Al2O3, 40.0 to 50.0 percent of SiO2 (silicon dioxide) and 6.0 to 10.0 percent of Fe2O3 (ferric oxide). The ceramsite proppant prepared on the basis of the composition has the advantages of being controllable in particle size, high in sphericity, low in density and high in crushing resistance and corrosion resistance.

The present invention provides a method for preparing a dehydrating agent for bauxite tailings slurry, comprising the steps of: uniformly mixing an inorganic silicate coagulant with an acrylamide monomer, an acrylic acid monomer, a hydrophobically associating monomer, a hydrophobically associating solubilizing monomer, and an aqueous emulsifier; adding a water-soluble chain transfer agent, a metal complexing agent, a temperature initiator, and a persulfate oxidant to the mixture; and uniformly mixing to obtain a dispersed phase; wherein the inorganic silicate coagulant is prepared by polymerization reaction of a silane coupling agent, an inorganic aluminum salt, and an alkali solution; and uniformly adding the dispersed phase to a continuous phase to obtain a water-in-oil inverse emulsion mixed system; wherein the continuous phase is obtained by uniformly mixing a base oil, an oil-soluble emulsifier, and an oil-soluble initiator; and adding a reducing agent solution to the water-in-oil inverse emulsion mixed system, and performing polymerization reaction in stages to obtain a dehydrating agent for bauxite tailings slurry. The dehydrating agent prepared in the present invention has both excellent settling velocity and flocculation effect.

This invention belongs to the field of building materials technology, and particularly relates to a low-carbon building material for construction and its application method, comprising 30-50 parts of filler, 30-50 parts of cementitious composition, and 10-15 parts of water; wherein, the filler is prepared by a method including the following steps: weighing 3-5 parts of acrylic acid, adding 2-5 parts of water and stirring evenly, then adding 0.03-0.05 parts of initiator and 0.1-0.3 parts of crosslinking agent, stirring evenly, then adding 100-110 parts of inorganic solid waste, stirring and reacting at 60-65℃, aging, to obtain the filler; the inorganic solid waste includes tailings sand, and the tailings sand contains 10-20% bauxite tailings by mass; the cementitious composition consists of 10-20 parts of steel slag powder, 0.3-1 parts of active activator, and 5-10 parts of curing agent. The processing and preparation method of this invention is simple, and without using silicate cement, it simultaneously possesses good mechanical properties, permeability, and construction adaptability.

The invention belongs to the technical field of refractory materials, and relates to a method for preparing multi-layer light spherical refractory aggregate from coal gangue-bauxite tailings. According to the preparation method of the multi-layer light spherical refractory aggregate, coal gangue powder is subjected to spray granulation to form inner core spherical particles, coal gangue-bauxite tailing composite powder and bauxite tailing powder are sequentially coated on the surfaces of the particles to form multi-layer spherical particles, and the mass ratio of the coal gangue powder to the composite powder is controlled to be (20-80): 100; and finally, drying, and calcining at 1250-1400 DEG C to obtain the multi-layer spherical refractory aggregate. According to the preparation method, the raw materials are easy to obtain, the cost is low, and the preparation process is simple; the multi-layer light spherical refractory aggregate disclosed by the invention is small in volume density, low in K2O and Na2O content on the surface of the aggregate, good in structural continuity and very good in application value.

This disclosure provides at least one embodiment of a method for preparing sponge titanium, comprising: pretreating bauxite tailings to obtain a first mixture; acid-treating the first mixture and filtering it to obtain a second mixture; placing the second mixture in a reaction vessel containing an alkaline substance to react, thereby converting ferrous titanate into titanate and ferric oxide or ferrous hydroxide to obtain a third mixture; filtration of the third mixture to obtain a first solid phase and a first liquid phase, and drying and grinding the first solid phase; calcining the dried and ground first solid phase to form elemental iron, and performing magnetic separation to remove the elemental iron; adding an acidic substance to the first liquid phase to react and obtain metatitanic acid colloid, and washing the metatitanic acid colloid; and sequentially subjecting the metatitanic acid colloid to calcination, chlorination, and displacement reactions to obtain sponge titanium. The sponge titanium obtained by this preparation method has high purity.

The invention discloses a method for enriching aluminum oxide by using silicon ore tailings and preparing a mullite refractory material. The method comprises the steps that firstly, silicon ore tailings are subjected to ball milling till the content of the-74-micron particle fraction is 60%-70%, then foam flotation treatment is conducted, and efficient separation of aluminum-containing minerals and gangue is achieved by adjusting the pH value of ore pulp, the concentration of the ore pulp, the using amount of a collecting agent, the air amount, the thickness of a foam layer and other technological parameters. When the content of aluminum oxide in the tailings is insufficient, fly ash, bauxite tailings, low-grade bauxite or waste refractory material powder can be added as supplementary raw materials. And finally, aluminum-rich concentrates with the aluminum oxide content of 63 + / -1%, 67 + / -1%, 73 + / -1% and 75 + / -1% are obtained, and homogenized materials of different grades are formed. And the obtained concentrate is subjected to vacuum pugging, molding, drying and sintering to prepare the mullite or corundum-mullite refractory product with excellent performance.

The invention discloses a method for producing high-purity silicon dioxide and high-purity quartz independent of traditional quartz ore, and belongs to the technical field of high-value utilization of solid wastes and preparation of high-purity silicon dioxide and high-purity quartz sand. According to the method, various industrial solid wastes containing aluminosilicate phases, ores, intermediate byproducts and the like are used as raw materials, and residues are obtained after aluminum oxide is extracted through an acid process. Comprising but not limited to acid-process extracted aluminum slag of various mill tailings including coal gangue acid-process extracted aluminum slag, fly ash acid-process extracted aluminum slag, bauxite mill tailings and the like, various metallurgical acidolysis residues including acidolysis waste residues generated in the production process of titanium dioxide through a sulfuric acid method, and residues left after acid-process aluminum extraction of various materials containing aluminosilicate ore; and selecting at least one of the raw materials to produce high-purity silicon dioxide and high-purity quartz in a green and low-cost manner. The new method has the advantages of low raw material purity requirement, wide raw material source, green and cheap production process, and obvious environmental protection and economic benefits, and the purity of the obtained product is higher than 3N and can be up to 4N-6N.

Provided in the present disclosure are a low-clinker cementing material, and a preparation method therefor and the use thereof. The cementing material is formed by mixing a variety of raw materials, the variety of raw materials comprising, in percentage by mass on a dry basis, 30-50% of calcined high-iron bauxite tailings, 10-20% of dolomite, 35-45% of Portland cement clinker, and 4-6% of gypsum. The low-clinker cementing material prepared in the present disclosure can be used for preparing concrete according to the mixing proportion thereof in conventional C30-grade concrete; and all the mechanical properties of the prepared concrete can reach the grade C30, but the content of the Portland cement clinker is lower, which is conducive to carbon emission reduction in the cement industry. The raw materials in the present disclosure are green and low-carbon, have extremely high pozzolanic activity in a cementing material system, and can improve the mechanical properties and durability of the cementing material. The present disclosure achieves the efficient utilization of solid waste and bulk natural minerals that are easily available, and is free of direct emissions of CO2 during the process of processing, thereby being green, low-carbon and environmentally-friendly and having significant economic effects.

The invention belongs to the technical field of building materials, and relates to modified bauxite tailing-based low-carbon cement and a preparation method thereof, the modified bauxite tailing-based low-carbon cement comprises the following components: 55% of Portland cement, 30% of modified bauxite tailings, and 15% of limestone powder; the modified bauxite tailings are prepared by uniformly mixing 95% of bauxite tailings and 5-85% of sodium-based desulfurization ash according to the mass ratio of 95%: 5-85%: 15% and co-calcining at 600-700 DEG C. According to the method, the content of amorphous components in the bauxite tailings is increased, the polymerization degree is modified, the early hydration rate of the bauxite tailings is increased, and part of sodium-based desulfurization ash can promote early hydration, so that the early compression resistance of the low-carbon cement is remarkably improved.

This invention discloses a method for recovering bauxite tailings and a filter press thereof. The method for recovering bauxite tailings includes the following steps: Step 1: The slurry-like bauxite tailings are squeezed out of some water using a filter press to form lumps; Step 2: The lumps are heated to 750-850 degrees Celsius for 1.5-2.5 hours to form dry lumps; Step 3: The lumps are crushed using a pulverizer; Step 4: The crushed tailings are sold directly as polyaluminum raw materials. This process can realize the recycling and reuse of bauxite tailings, greatly reducing resource waste and environmental pollution.

The invention belongs to the technical field of building materials, and discloses high-strength lightweight aggregate concrete prepared from multi-element solid waste and a preparation method of the high-strength lightweight aggregate concrete. The invention provides a high-strength lightweight aggregate concrete prepared from multi-component solid waste, which is prepared by calcining bauxite tailings, carbide slag and other raw materials to prepare solid waste-based sulphoaluminate cement, taking blast furnace slag and waste ceramic powder as coarse aggregates, taking waste concrete powder and steel slag as fine aggregates, and preparing the high-strength lightweight aggregate concrete from the multi-component solid waste. The high-strength lightweight aggregate concrete prepared from the multi-element solid wastes is doped with the crushed stones and the sand, so that the doping amount of the crushed stones and the sand can be greatly reduced, the substitution rate of the solid wastes is increased, and resources are saved; the waste concrete powder and the steel slag can enter rich pore structures of the blast furnace slag and the waste ceramic powder, so that the mechanical property and the construction property of the high-strength lightweight aggregate concrete prepared from the multi-element solid waste are improved; meanwhile, a large amount of solid waste is used, and pollution of the solid waste to the environment is reduced.

The invention discloses a method for producing sintered bricks by using bauxite tailings, a product and application thereof, and belongs to the field of production of building materials by using industrial solid wastes. The method comprises the following steps: (1) mixing 50-70 parts by weight of bauxite dressing tailings, 30-40 parts by weight of fly ash and 0-10 parts by weight of expanded perlite to obtain a mixture; controlling the water content of the mixture to be within a certain range, and performing aging treatment to obtain an aged raw material; (2) preparing the aged raw materials into wet green bricks; (3) drying the wet green brick, and controlling the moisture content of the wet green brick in a certain range to obtain a dry green brick; and (4) roasting the dry brick blank, and then naturally cooling to obtain the sintered brick. According to the method, the raw material ratio is simple, production process parameters are easy to control, and the drying shrinkage rate and the sintering shrinkage rate of the green brick are remarkably reduced. The prepared sintered brick has good mechanical properties and thermal insulation properties, and has a good application prospect in building construction as a building material.

The invention discloses a method for comprehensively utilizing bauxite tailings, which comprises the following steps: mixing bauxite tailings, standard sand, cement and water, and carrying out compression molding and natural curing to obtain a baking-free brick. And reasonable and large-scale utilization of tailing resources is realized. The compressive strength of the baking-free brick prepared by the invention meets the requirements of Non-Sintered Rubbish Tailing Brick (JC / T422-2007) MU15 grade, a proper thought is provided for effective utilization of bauxite tailings, energy loss and greenhouse effect are reduced, and good social benefits, economic benefits and environmental benefits can be generated.

The invention relates to the technical field of oil and gas exploitation, and discloses an ultrahigh-strength ceramsite proppant and a preparation method thereof. The method comprises the following steps: mixing bauxite tailings, fly ash, high titanium slag and alpha alumina powder according to a mass ratio of (30-50): (20-30): (10-25): (15-20), carrying out ball-milling granulation to obtain green pellets, and sintering to obtain the high titanium slag-containing bauxite-alumina composite material. The obtained ceramsite proppant takes industrial solid waste as a main raw material, realizes resource utilization, is low in cost, environment-friendly and excellent in performance, has the crushing rate of less than 9% under the closing pressure of 159 MPa, the acid solubility of less than 7%, the sphericity of 0.8, the volume density of 1.70-1.85 g / cm < 3 > and the apparent density of 3.00-3.25 g / cm < 3 >, and can meet the strict requirements of deep and ultra-deep oil and gas well fracturing operation on high strength of the proppant.

The invention discloses a ceramsite preparation method and ceramsite, the method comprises the following steps: (1) pretreatment: bauxite tailings and fly ash are crushed and sieved to respectively obtain bauxite tailing powder and fly ash powder; (2) mixing: uniformly mixing the bauxite tailing powder, the fly ash powder, starch and bentonite to obtain a material mixture; (3) forming: adding water to wet the material mixture, and granulating to obtain raw material balls; (4) drying: drying the raw material nodules to obtain dry raw material nodules; and (5) preheating and roasting: preheating the dry raw material nodules, and roasting to obtain the ceramsite. According to the invention, bauxite tailings and fly ash are used as main raw materials for firing ceramsite, which is an effective way for recycling two solid wastes, namely bauxite tailings and fly ash, and appropriate chemical components of the raw materials, proportions of the raw materials, preheating temperature, roasting temperature and other factors are selected, so that a ceramic shell is formed, the surface is smooth, and the vitrification effect is good; the size is expanded, and the appearance is complete.

The present invention specifically relates to a solid heat storage material and a preparation method thereof. The technical solution is as follows: magnesite tailings fine powder, bauxite tailings fine powder, quartz sand fine powder, used magnesium carbon brick fine powder, and barium sulfate fine powder are mixed to obtain a premixed powder. Magnesite tailings particles with a particle size of 5 to 3 mm, bauxite tailings particles with a particle size of 3 to 1 mm, quartz sand particles with a particle size of 3 to 1 mm, and magnesite tailings particles with a particle size of ≤1 mm are mixed to obtain a granular material. The granular material and the premixed powder are mixed to obtain a mixture; polyvinyl alcohol solution is added, the mixture is evenly mixed, pressed and formed, dried, and then heat-treated at 1300 to 1500°C for 5 to 8 hours to obtain a solid heat storage material. The solid heat storage material prepared by the present invention has high thermal conductivity, large heat storage capacity, high thermal shock stability, and high compressive strength.

The invention discloses anti-disturbance and anti-cracking concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete is prepared from the following components: a cementing material, fine aggregate, modified iron tailing sintered aggregate, carboxymethyl cellulose sodium, fibers, a water reducing agent and water, the preparation method of the modified iron tailing sintered aggregate comprises the following steps: mixing iron tailings, bauxite tailings and limestone, then adding a polyvinyl alcohol aqueous solution, granulating, and sintering to obtain the iron tailing sintered aggregate; the iron tailing sintered aggregate is soaked in a mixed solution of gelatin and glutaraldehyde, then chopped fibers are added, the mixture is vacuumized after ultrasonic dispersion, and the iron tailing sintered aggregate is taken out and dried. The problem that fresh concrete aggregate is prone to segregation under the vibration disturbance working condition is solved through suspension aiding of the modified aggregate and thickening of the cement-based slurry, meanwhile, the fibers are subjected to cross lap joint blocking through the modified iron tailing sintered aggregate, and the fibers can still be distributed in the cement slurry in a criss-cross mode under the vibration working condition; the vibration-reducing, toughening and anti-cracking effects of the fiber are effectively realized.

The invention discloses a waste residue alkali-activated material cured Yellow River sediment water permeable brick and a preparation method thereof, and belongs to the technical field of solid waste resource utilization. The water permeable brick is composed of an upper layer and a lower layer. The upper layer structure material comprises 15%-25% of a waste residue alkali-activated material, 10%-20% of Yellow River sediment, 45%-65% of coal gangue machine-made sand, 5%-10% of hydrogel and 0.15%-0.20% of a water reducing agent; and the lower layer structure material comprises 15%-30% of a waste residue alkali-activated material, 10%-20% of Yellow River sediment, 50%-75% of bauxite tailings and 0.05%-0.2% of cellulose ether. The water permeable brick is prepared from solid waste materials, is low-carbon, environment-friendly and good in performance, is widely applicable to road pavement of pedestrian crosswalks and parking lots, realizes resource utilization of Yellow River silt and industrial waste residues, and is beneficial to promoting construction of sponge cities.

The present invention discloses a recovery system and method for fine-grained bauxite, which includes subjecting a bauxite tailings pulp with a concentration of 8-13% to primary concentration and desliming through a hydrocyclone to obtain a hydrocyclone overflow and a sand-containing pulp with a concentration of 25-42%; pumping the sand-containing pulp into a thickener for secondary concentration and desliming to obtain a thickener overflow and a thickener underflow of the dehydrated sand-containing pulp; pumping the dehydrated sand-containing pulp into a stirring tank for stirring and scrubbing to obtain a sand-containing pulp with a stable concentration of 25-28%; the sand-containing pulp with a stable concentration enters a suspension vibration ore separator for separation to separate out bauxite concentrate with an Al2O3 content of 50-70%, a SiO2 content of 5.5-11%, and a mass ratio of Al2O3 / SiO2 greater than 4 and high-silica tailings. The present invention uses an economical ore dressing method to recover bauxite concentrate from bauxite tailings pulp, which can not only effectively reduce the content of harmful component SiO2 in the ore, but also make the alumina-silica ratio in the concentrate meet the technological requirements for alumina purification.