12 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.

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.

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 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 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.