6 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.

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.

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 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.