57results about How to "Good technical and economic indicators" patented technology

The invention relates to a hollow floor system filled with an air-filling bag and a construction method thereof, belonging to the field of the structure of the common building. The hollow floor system consists of the air-filling bag (1), upper steel bars (2), lower steel bars (3), hidden girder steel bars (4) and concrete (5), wherein the air-filling bag (1) is positioned among the upper steel bars (2), the lower steel bars (3) and the hidden girder steel bars (4); a bag wall (8) of the air-filling bag (1) consists of four side walls (9), an upper wall (10) and a lower wall (11); the shapes of at least two side walls (9) adjacent to the hidden girder steel bars (4) in the air-filling bag (1) are planes; the shapes of the upper wall (10) and the lower wall (11) are heaved-outward arc surfaces; and positioning pieces (12) are arranged among the inner sides of the side walls (9) so as to ensure that the two side walls (9) are parallel mutually. The hollow floor system has large span, better reliability, earthquake resistance and crack resistance, and good economy and applicability.

The invention relates to a tin-smelting process, in particular to a method for tin smelting by combining a DC electric furnace and a fuming furnace and for comprehensively recycling iron. The steps of the invention are as follows: reducing agent is added according to the components of tin concentrate, and then, the mixture is put in the DC electric furnace for reduction and smelting to generate metallic tin; and vulcanizing agent and slagging flux are added to liquid slag according to components of the liquid slag, and then, the mixture is put in the fuming furnace to be vulcanized to volatilize the tin in the slag; meanwhile, the mixture is recycled in the form of tin oxide fume; the fumed slag is put in the DC electric furnace in the liquid state, and then, the reducing agent and the flux are added to the fumed slag to be smelted to generate pig iron; meanwhile, the residual sulphur contained in the slag is utilized to continually volatilize the residual tin, and the water-quenched slag can be used as the raw material for building. The method is suitable for processing various tin-containing materials; compared with the traditional tin-smelting method, the tin-smelting method provided by the invention has the advantages of less investment and high tin recovery rate and can comprehensively recycle iron and other valuable metals.

The invention relates to a middings magnetic separator tailings classifying separation recovery system and a middings magnetic separatortailings classifying separation recovery technology for a dense medium coal preparation plant. The system comprises a middings magnetic separator, a coal slime classifying device, a flotation unit and a coarse coal slime dewatering and recycling device, wherein the middings magnetic separator is connected with the coal slime classifying device; the coal slime classifying device is respectively connected with the flotation unit and the coarse coal slime dewatering and recycling device. The method comprises the steps of firstly, feeding dilute middings medium into the middings magnetic separator to carry out magnetic separation; feeding the middings magnetic separator tailings into the coal slime classifying device, and classifying according to the particle sizes of the middings magnetic separator tailings; after that, dividing the middings magnetic separator tailings into coarse fraction and fine fraction; feeding the middings magnetic separator tailings in the coarse fraction into the coarse coal slime dewatering and recycling device, feeding the middings magnetic separator tailings in the fine fraction into the flotation unit, and sorting and recovering fine-particle clean coal. After the system and the technology are adopted, under the condition of same quality indexes of the clean coal, the recovery rate of the clean coal can be improved, or the number of flotation units and the consumption of flotation reagent can be reduced, and the floatability of flotation fed material can be improved.

The invention provides a process optimization method for sintering a vanadium-titanium magnetite concentrate by a large-scale sintering machine. According to the invention, the method comprises the following steps that: a sintering process is constructed into a sintering system that includes input, an intermediate link and output; ore return quantity, feeding quantity, material layer thickness, machine speed, and material temperature and the like are selected and are taken as adjustable parameters; index parameters of a sintering system are improved by a plurality of phases that are connectedsequentially, wherein each phase among the plurality of phases comprises multi-group records that record adjustable parameters and the index parameters that are corresponding to the adjustable parameters during sintering production and a record in which index parameters satisfy a target range of the present phase is selected from the multi-group records; adjustable parameters at the next phase are controlled on the basis of a mean value of adjustable parameters of the last phase among the plurality phases, wherein the adjustable parameters of the last phase are in a record and satisfy a target range of the last phase and the target range of the next phase is not inferior to that of the last phase. According to the invention, index parameters including a utilization coefficient, a drum index and low solid fuel consumption and the like in the sintering process are improved.

The invention discloses a fabricated longspan concrete double-slope net shell roof framework and a manufacturing method thereof. The framework is formed by obliquely placed multi-ribbed slabs converged at a ridge beam, the two ends are supported on gable end partitions, slope bases supported on longitudinal frame beams vertically intersected with anti-pushing frameworks, and no supporting frame isinstalled under the ridge beam. The gable end partitions are triangle vierendeel trusses composed of upper chords, lower chords and vertical web members, the anti-pushing frameworks are composed of framework columns and short-leg shears supported under lower part floor beams. The framework manufacture adopts a fabricated method, roof boards and ribs are prefabricated and all-round scaffolds, prefabricated parts are connected into an entirety through cast-in-place of connecting blocks and pouring of the boards and the ribs connecting concrete, the use ratio of the large space under the roof isimproved, the problem of flowing during the cast-in-place of obliquely placed concrete in a large area is overcame, the template consumption is reduced, and the construction period is shortened.

The present invention discloses a kind of obliquely-crossed obliquely-placed grid reinforcement-concrete open-web sandwich reticulated barrel shell and barrel vault roof structure. It is made up by utilizing reinforcement-concrete crossed, obliquely-placed and combined open-web sandwich plate and bending it along span direction according to the curved or parabolic form. As compared with existent technique the invented concrete reduced thickness can be reduced by 30%-50%, its structure self weight can be reduced by 30%-50% and its reinforcement consumption can be reduced by 25%-30%, so that its construction cost also is reduced.

The invention provides a method for conducting leaching and flotation on ores in the same leaching and flotation cells. The method is characterized in that the ores are leached and floated in the same leaching and flotation cells; and the leaching and flotation cells are divided into two or more sections according to the chemical mixing, roughing, scavenging and fine selecting functions required by the flotation procedure in the procedure, and each section is provided with at least one leaching and flotation cell. The method has the beneficial effects that leaching and flotation are performed in the same cells, so that the leaching process, the flotation process, a leaching system, a flotation system, a leaching agent, a floating agent and leaching liquid are coordinated, and the recovery rate index and the concentrate quality index are increased. The leaching process and the flotation process are better combined. The procedure of the method is shorter than the procedure in which the ores are leached firstly and then floated or floated firstly and then leached in the prior art, equipment investment is saved, energy consumption is low, used labor is small, and production cost is low.

The invention discloses a method for recycling byproducts generated in aluminum electrolysis, and relates to a method for recycling byproducts such as shell surface materials, recycled aluminum dirty materials, aluminum ash and the like in the aluminum electrolysis production process. The method is characterized by comprising the following steps of: collecting the byproducts generated in the process of electrolyzing aluminum, screening, mixing and crushing, and gathering in a storage silo; and when an anode is replaced during aluminum electrolysis, lifting materials in the silo on the ground, conveying into a feeding bin of an electrolyzer through a pipe, and automatically feeding to cover the surface of the anode. In the method for recycling the byproducts generated in aluminum electrolysis, the byproducts such as the shell surface materials, recycled aluminum dirty materials, aluminum ash and the like generated in the aluminum electrolysis process are all recycled, and problems of high cost, high labor intensity, long working hours, high thermal loss of the electrolyzer, low environmental sanitation and the like in the adding process are solved. The technical economical indexes of the system are obviously improved, and the aims of zero emission of the byproducts of the aluminum electrolysis and energy conservation and consumption reduction are fulfilled.

The invention discloses a long-span long-narrow concrete honeycomb open-web sandwich floor covering which comprises an upper chord layer and a lower chord layer. The lower chord layer comprises a plurality of orthohexagonal grids formed by open web girders in a crossed mode, each short edge is formed by edges and diagonal lines of regular hexagons alternately, and each support on the short edges of the covering is connected with one corresponding open web girder, wherein the included angle between each short edge and the corresponding open web girder is 60 degrees; and each support on the long edges of the covering is connected with two corresponding symmetrically arranged open web girders, wherein the included angle between each long edge and the corresponding open web girder is 30 degrees. The upper chord layer is a regular triangular prefabricated slab fixedly connected with the lower chord layer, so that a reinforced concrete floor plate with regular triangular grids is formed, and a concrete layer is poured on an orthohexagonal prefabricated slab. By improving the structure of the honeycomb open-web sandwich floor covering, the effect that the covering is prevented from being overreinforced, and constructional reinforcement defects are avoided is guaranteed, ideal technical and economical indexes can be met, and the construction policy that the covering is applicable, economical, environmentally friendly and attractive is met.

The invention relates to an assembled cover-plate-and-bolt-connected sphere joint, in particular to a six-rod-tetrahedral-module-unit assembled cover-plate-and-bolt-connected sphere joint and an assembling method thereof, and belongs to the field of steel structures. The six-rod-tetrahedral-module-unit assembled cover-plate-and-bolt-connected sphere joint comprises a left connecting body and a right connecting body, and the left connecting body and the right connecting body are jointed in an end-to-end mode. The six-rod-tetrahedral-module-unit assembled cover-plate-and-bolt-connected sphere joint and the assembling method thereof are compact in structure, excellent in using performance and high in adaptability.

The invention provides an environment-friendly vegetable protein based efficient water and fertilizer slow/controlled-release material. The slow/controlled-release material is prepared from the following components in parts by mass: 30-80 parts of thermoplastic vegetable proteins, 20-60 parts of resin, 5-7 parts of graft modification substances, 1-5 parts of initiator, 2-5 parts of foaming agent and 2-5 parts of lubricating agent. A slow/controlled-release fertilizer prepared on the basis of the slow/controlled-release material provided by the invention has the initial nutrient release rate of less than 13.0% after being soaked in 25-DEG C static water for 24h, the accumulated nutrient release rate of less than 78.0% within 28d and the accumulated release rate of more than 92.6% within the nutrient release period. The effective utilization ratio of nutrients in the fertilizer is increased by more than 35.9%, so that the usage amount and fertilization times of the fertilizer can be greatly reduced, the effective utilization rate of the fertilizer can be increased, and the ecological environment destruction caused by the fertilizer can be effectively relieved.

The invention belongs to a non-blast-furnace smelting technology which achieves new energy development, replaces coke with coal and is low in cost and energy consumption, environment-friendly and short in technological procedure, and relates to a spontaneous combustion reduction method iron-smelting method and a smelting device. The method comprises the steps of furnace charge preparing, drying, preheating and roasting and smelting. According to the method, no sintering material or coke is adopted, and no coal gas is generated. The smelting device comprises a tunnel kiln and a smelt separation furnace. Waste heat generated by the smelt separation furnace is all used for drying and preheating of furnace charge blocks. Negative pressure operation and weak reduction smelting atmosphere completely opposite to those in a traditional iron-smelting method are adopted, the heat value of fuel is given into full play to the greatest extent, and energy is utilized most effectively.

The invention provides a rotating speed control method of a ball mill based on the grinding effect of steel balls in the ball mill, and relates to the field of energy conservation and consumption reduction of efficient development and utilization of solid mineral resources. The rotating speed control method comprises the steps that coordinate systems XAY and xoy are established, and a detachment angle alpha, a fall-back angle beta and included angles theta and gamma of the steel balls are defined; the coordinates of a point B and a point C in the coordinate system XAY and the relationship between the angle alpha and the rotating speed of the mill are determined; the velocity component in the vertical direction of the steel balls at the point B is determined; the final speed of the steel balls at the point B are determined; the sine and cosine of the angle theta are determined; the coordinates of the point B of the steel balls in the coordinate system xoy are determined; the relationship between the angle beta and the angle alpha is determined; the cosine of the angle gamma is determined; the normal velocity of the steel balls falling back to the point B is determined; and a methodfor adjusting and controlling the rotating speed psi of the ball mill is determined. The rotating speed control method realizes the timely adjustment of the rotating speed of the ball mill by means ofa frequency conversion speed regulation technology, so that the working state of the ball mill is adapted to the specific properties of a processing object at any time, and the technical and economicindexes of the ore grinding process are always in the best state.

The invention discloses an irregular II type large-span concrete vierendeel sandwich plate floor. The ratio of the long side and the short side of the reinforced concrete is that Lx/Ly is large than 1.5, a one-way stress plate is formed, the ratio of the long side Lx and support spacing does not have common divisor, the position where the support spacing is large is located in the center of the long side, and a grid structure comprises a square grid a, a right angled isosceles triangle grid b, a parallelogram grid c, an irregular quadrilateral grid d and a non-right angled isosceles triangle grid e. The invention further provides a making method of the irregular II type large-span concrete vierendeel sandwich plate floor. Accordingly, energy conservation and emission reduction are promoted, and the good technical-economic index is achieved.

Comparing with prior method for determining structure parameters based on transitional theory, the invention builds mathematic model to calculate parameters accurately so as to overcome disadvantages of determining parameters based on operating experience and engineering analogy. Thus, production efficiency and technical economical index of mine is raised. The technical scheme is as following: after height of subsection is selected in mining model in large subsection without sill pillar, drawing off height H_f is determined. C is determined based on relational expression Cú¢0.000819H_f²-0.025H_f+2.578. Then, entrance span L is determined based on Hú¢(3/2)í‡Cí‡L. Advantages are: simple technical scheme, high accuracy for parameters, better technical economical index. The invention is suitable to exploitation for underground mine.

The invention relates to an Anshan-type hematite silicon-control benefication method. The Anshan-type hematite silicon-control benefication method is characterized by comprising three crushing times, screening, ball-milling classification and two reselection times, and includes particular steps of crushing, to be more specific, performing rough crushing, intermediate crushing, fine crushing and screening operation on Anshan-type hematite on working faces so that more than 90% of products have the particle sizes of 0-12mm; feeding the crushed and screened products into ball-mill and involute cyclone assemblies to be subjected to closed-circuit grinding, and classifying the crushed and screened products according to the thicknesses of the crushed and screened products; feeding flow which flows from thickness classification cyclones into roughing spiral chutes and concentration spiral chutes, and secondarily reselecting the flow to obtain ultimate concentrates with 65%-65.5% of iron and 5%-5.5% of SiO<2>. The Anshan-type hematite silicon-control benefication method has the advantages that technical processes are simple, technical and economic indexes are good, the grade of the iron concentrates is reduced from the original 67% and is 65.5%, but the contents of iron in tailings at the grade is reduced from the original 9.5% and is 9%, the recovery rate of the iron is increased by 1 percent, the yield is increased by 1.5 percents, the contents of the SiO<2> are effectively controlled and are 5%-5.5%, and excellent economic benefits can be acquired in follow-up sintering and smelting procedures.