3 results about "Bauxite tailings" patented technology

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.

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.