87results about How to "Restore evenly" patented technology

The invention discloses a hierarchical material distribution reduction method for a sponge iron tunnel kiln and the tunnel kiln applying the hierarchical material distribution reduction method. Materials to be reduced are divided into different grades according to the particle size range, the materials, in different grades, to be reduced are respectively mixed with reducers to form mixed materials, the mixed materials are tiled on a table board of a tunnel kiln car in layers, the particle size range of the materials to be reduced in each layer is gradually increased from the bottom layer to the top layer, and the kiln car carries out reduction by passing through a preheating zone, a roasting zone and a cooling zone in the tunnel kiln after the materials are tiled. By adopting the hierarchical material distribution reduction method, iron ores in different particle sizes can be uniformly reduced during reduction from the upper layer to the bottom layer and in a process of oxygenating for the upper layer by the lower layer in the tunnel kiln; ash of a reduced carbon layer can leak into the lower part from an isolation pore plate, and magnetic separation quantity of a magnetic separation step for the reduced materials after drawing is reduced; and a heat exchanger specially used for the tunnel kiln and a fan are arranged, so that a reducing gas is fully utilized, burning gas does not need to be additionally supplemented, and cost is reduced.

A rack guide mechanism includes: a housing; a rack guide housed in the housing so as to move freely, supporting a rack shaft; a lid member attached to the housing; and an elastic member interposed between the rack guide and the lid member, biasing the rack guide to the rack shaft, in which the elastic member includes a first elastic portion constantly sandwiched between the rack guide and the lid member, and a second elastic portion sandwiched between the rack guide and the lid member when the rack guide moves to the lid member side by a given distance, and the first elastic portion and the second elastic portion are integrally formed.

The invention discloses a system and a method for vanadium titano-magnetite fluidization oxidation and reduction. A four-section fluidized bed is adopted to carry out fluidization oxidation and reduction on vanadium titano-magnetite fine ore; and a fluidized bed reaction body is formed by boiling beds connected in series. Through the technological design of a pre-oxidation treatment and low-gas-velocity reaction fluidized bed, the vanadium titano-magnetite powder fluidization performance can be obviously improved, the reaction efficiency is improved, and the process energy consumption is reduced. The vanadium titano-magnetite fine ore is firstly preheated and dried, enters a low-temperature oxidation bed so as to be subjected to oxidation treatment, then enters a prereduction bed so as to be subjected to prereduction, and finally complete final reduction through a two-stage high-temperature final reduction bed; oxidization tail gas is used for preheating and drying the vanadium titano-magnetite fine ore; after reduction tail gas is heat-exchanged with oxidization air, oxidization components are cleaned and removed, and the reduction tail gas is recycled; and a gas utilization scheme has the advantages of high reaction efficiency and high energy utilization ratio.

The invention discloses a system and method for vanadium-titanium magnetite ore powder fluidized high temperature rapid oxidation and reduction. The system adopts three boiling fluidized beds connected in series to carry out vanadium-titanium magnetite ore powder fluidized high temperature rapid oxidation and reduction treatment. The vanadium-titanium magnetite ore powder is preheated and dried, then is fed into an oxidized bed and then is subjected to high temperature oxidation treatment, the product is fed into two stages of reduction beds and is subjected to high temperature reduction, oxidation tail gas is used for preheating and drying vanadium-titanium magnetite ore powder, the reduced tail gas undergoes heat exchange with the oxidized air, then the oxidized component is removed through cleaning and the reduction tail gas is recycled. The pre-oxidization treatment unit and the low gas velocity fluidized bed are connected in series so that high temperature fluidization performances of the vanadium-titanium magnetite ore powder are obviously improved, ore reaction efficiency is improved and process energy consumption is reduced. The system and method have the advantages of high reaction efficiency and high energy utilization rate.