The present disclosure is related to filter elements and more specifically to filter elements for removing dust from air. In an embodiment, an inventive filter element includes a housing having a first side and a second side, filter material in the housing, a space between the filter material and the first side of the housing for forming a suction chamber, and at least one hole in the first side, whereby the area within the circumference of the side of the filter material facing the first side of the housing is larger than the area of at least one hole.

The present invention discloses a system and process for producing a variety of dry mix construction and ancillary construction materials (DMC) with improved structural properties. The said system and process employs a material classification unit (204) that classifies at least one of plurality of raw materials (A, B, . . . N) based on their particle size and physical properties. These classified raw materials are stored separately in material handling compartments (260) and are selected according to the construction grade requirements of the end user. The invention further involves the use of a material selection unit (210) which controls the functioning of various components of present invention. The said system and process also provides an easy means of reutilization of industrial waste products like fly ash, blast furnace slag to produce a variety of construction and ancillary construction materials.

A system for separating components of a residual concrete mixture comprising a frame with a rail, a lifting device suspending vibrating sieves of different mesh sizes configured to move horizontally and vertically and to change and angle of inclination, a process tank with a water under the vibrating sieves with water level control means, a pump in a bottom the process tank configured to move a water-cement mixture previously passed through the vibrating sieves, comprising a movable control nipple configured to determine a cement concentration and directing subsequently the water-cement mixture in a first tank if its density is higher to a predetermined value, or in the second tank, if the density of the mixture is below the predetermined value, through a sand filter, also serving as a sand hopper of sand sifted on a lower sieve; and a control unit configured to control the system.

Hemihydrate and/or anhydrous Type III gypsum granules derived from wasted gypsum boards are fed into a flow path of an aqueous gypsum slurry containing dihydrate gypsum, are mixed with the gypsum slurry, and are fed into a deposition tank of dihydrate gypsum. The gypsum slurry is fed from an inlet of the flow path, and the hemihydrate and/or anhydrous type III gypsum granules derived from wasted gypsum boards are fed into the gypsum slurry from above. The gypsum slurry after mixing is made to flow to an outlet of the flow path while the upper surface of the gypsum slurry is always exposed to air. The gypsum slurry is fed into a pipe by free fall. The gypsum slurry is made to impinge on the far side of the pipe as viewed from the outlet and fall or to fall down the center portion of the pipe. The generation of gypsum scale is suppressed in the mixing device for mixing gypsum granules derived from wasted gypsum boards with gypsum slurry.

The present invention discloses a centrifugal intelligent construction device for excavating concrete structure: a push-type excavation equipment, excavating rocks and soil, and collecting crushed stones, sand, soil, and water; a centrifugal screening equipment, performing centrifugal screening and classification collection on the collected crushed stones, sand, soil, and water; the intelligent batching equipment, which matches the classified crushed stones, sand, soil, and water according to their quality and fineness, adding cementitious materials, auxiliary materials, additives, and activators, and mixing them to obtain a mixed wet material; a centrifugal printing equipment, pumping and extruding the mixed wet materials, and using a centrifugal rotating outer cylinder to print and compact them into dense shape; an intelligent reinforcement equipment, integrating reinforcements between the layers of printed concrete strips by using the wall mounted laying, positioning and inserting reinforcements inside the printed concrete strips during the centrifugal printing process to form an integrated reinforced concrete structure. The device can achieve the additive and intelligent construction of closed concrete structures in underground, underwater, and extreme construction environments, solving the technical dilemma of insufficient engineering application scope of open additive manufacturing technology.

A method and an apparatus for high-throughput preparation of a cement-based material are released and belong to the technical field of cement production. According to the technical solution of the present application, a single-mine, a single-phase or a unit components maintaining specific hydration hardening characteristics are used as structural units, and the method comprises the following steps that (1) the structural units are placed in storage tubes X1, X2, X3 . . . Xn respectively; (2) the materials in the storage pipes are put according to the composition design proportion of the cement-based material, and Y1, Y2, Y3 . . . Ym of mixed materials are prepared; (3) fully and uniformly mixing the Y1, Y2, Y3 . . . Ym of mixed materials through a uniform mixing device; and 4) respectively filling the Y1, Y2, Y3 . . . Ym of uniformly mixed materials into storage tanks Z1, Z2, Z3 . . . Zm to prepare m groups of cement-based material samples. The method and device are easy to operate and high in applicability, and the material research and development manpower and resource cost can be greatly reduced.

The invention relates to a method for producing artificial crushed sand by means of a thermal treatment using sand in the form of fine sand (FS/FSa) and/or round sand as the starting material (1). The starting material (1) in variant A is heated to a melting temperature by bundling sun rays (13), and/or the starting material in variant B is heated to a melting temperature by using a conventional melting device which achieves its energy supply using converted or stored solar power, whereby each of a plurality of sand grains are melted together into a three-dimensional intermediate product (2). The intermediate product (2) produced in this manner is cooled and finally comminuted to a particle size of less than 2 mm in a comminuting process. An end product (3) is produced which differs from the starting material (1) with respect to the shape and surface roughness. The method offers a long-term solution for meeting the demand for crushed sand and provides sand for the construction industry.

A concrete product set by pouring a concrete slurry includes a concrete mixture, an aluminum-coated colloidal silica admixture, and optionally, at least one reinforcing fiber selected from the group of fibers. As the poured concrete slurry cures, the poured slurry hardens into a composite material product, and the concrete product defines capillary structures that at least in part fill with aluminum-coated silica and lime. Optional graphene oxide may be used in the concrete slurry, in which embodiment the surrounding aggregate and cement is embedded with graphene oxide flakes. A process for placing a jointless and/or fiberless slab made from the concrete product includes preparing a concrete slurry, pouring the concrete slurry onto substrate, and allowing the concrete slurry to cure.

A method of retrofitting an existing apparatus for forming concrete products, where the apparatus comprises an existing component located upstream of a product mold and adapted to deliver treated concrete to the product mold, adapts the existing component to treat fresh concrete to be delivered to the product mold by a new component with treated water infused with a concentration of carbon dioxide nanobubbles. The step of adapting comprises adding to the existing component a water delivery system that is configured to direct the treated water into the fresh concrete, where the water delivery system is provided with one or more liquid manifolds configured to dispense the treated water into the fresh concrete to form treated concrete.

An apparatus for delivering a wet concrete mix to a product mold, where the apparatus comprises a hopper configured to retain a fresh concrete mix, a source of treated water having a concentration of nanobubbles of a gas at least double a natural concentration of nanobubbles of the gas within a natural state of the water, a water transport coupling the source of treated water with the hopper, a valve interposed within the water transport for selectively releasing the treated water into the hopper, and a mixer in communication with the hopper for mixing the treated water with the fresh concrete mix to yield an infused wet concrete.