A converter slag combined quenching alkali elimination magnetization heat recovery device and method

Abstract

The invention relates to a combined quenching and debasing magnetization heat recovery device and method for converter slag. It includes a waste gas / water dual-fluid injection device, a joint quenching chamber, and a double-layer airflow injection magnetization sorting conveyor. The joint quenching chamber is a closed cavity structure. One end of the top of the joint quenching chamber is provided with an overflow groove, and the other end is provided with a gas exhaust. At the outlet, the waste gas / water dual-fluid injection device includes a feeding barrel and a nozzle structure, the nozzle structure is located inside the combined quenching chamber, the feeding barrel is partially located outside the combined quenching chamber, and the feeding barrel located outside the combined quenching chamber is provided with a gas inlet and The liquid inlet, the incoming gas contains carbon dioxide, the nozzle structure is located just below the overflow tank, and the double-layer airflow injection magnetization sorting conveyor is located at the bottom of the quenching chamber. Realize the process of recycling steel slag heat, eliminating alkali, magnetic separation and so on. The obtained steel slag particles have good applicability.

Description

Technical field [0001] The present invention belongs to the field of metallurgical solid waste resource utilization, and in particular, it is specifically involved in a converter slag ferrosation heat recovery apparatus and method. Background technique [0002] The information disclosed in the background is disclosed only to increase the understanding of the overall background of the present invention, and is not necessarily considered to admit or imply that the information is intended to be a prior art known to those skilled in the art. [0003] my country mainly uses long-proof converter steelmaking process, converted steel slag accounts for 88% of the total steel slag, the mainly used water quenching, mainly mineral components are calcium magnesium olivine (Cao · Mgo SiO 2 ), Silicate (C) 2 S), three calcium silicate (C 3 S), calcium magnesium rosebus (3cao · mgo 2Sio 2 ), Feroculation (2cao · Fe 2 O 3 ), Metal oxide phase (RO), its number of 120 million T growth, low environm...

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Problems solved by technology

[0003] my country mainly adopts the long-process converter steelmaking process, and the converter steel slag accounts for 88% of the total steel slag. 2 ), dicalcium silicate (C 2 S), tricalcium silicate (C 3 S), calcium magnesium rhodoxene (3CaO MgO 2SiO 2 ), dicalcium ferrite (2CaO Fe 2 o 3 ), the metal oxide phase (RO), the number of which increases every about 120 million tons, the environmental friendliness is low during the treatment process, the iron, heat recovery effect is poor, and the degree of resource utilization is very unsatisfactory, and a large amount of stockpiling or landfill damages the ecological environment , environmental protection issues are prominent, which seriously restricts the iron and steel industry from realizing comprehensive green manufacturing

[0004] The current outstanding problems in the resource utilization of converter slag are as follows: ①Converter slag contains free calcium oxide (f-CaO) and free magnesium oxide (f-MgO) as well as trace amounts of FeS and MnS. Poor stability and volume stability of cement materials; ②Steel slag contains 20-30% FeO with no gelling activity x (with Fe 2 o 3 meter), so that C 3 S, C 2 The relative content of S decreases, and C 3 S, C 2 S crystals are well-developed, have few defects, and have poor gelling activity, which also affects the improvement of its utilization rate; ③ The iron occurrence phase in steel slag can be separated by weak magnetic separation, and the proportion of metallic iron and magnetite is small, and non-magnetic limonite , Hematite accounts for more than 60%, and the total iron content of steel slag is still as high as 5-30% after iron removal; ④Molten steel slag contains a lot of heat energy (~1.2GJ / t slag, about 41kg standard coal calorific value), the current treatment process (Water quenching, hot stuffing, drum, granulation wheel method) use a large amount of water medium to quench it to generate hot water or steam. The heat medium has low heat (generally <100°C) and contains a large amount of particulate impurities and suspended solids. Taste Poor and easy to cause fouling of heat exchangers and pipelines, the overall heat recovery rate is actually very unsatisfactory

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