A device and method for preparing cement mixture using hot converter slag

Abstract

The invention discloses a device for preparing a cement admixture by utilizing hot converter slag and a preparation method. The device comprises a reaction furnace, an electrode, a driving power supply unit, a conveying device, an auxiliary material spray gun, a reducing agent spray gun and a heat-preserving furnace cover. The preparation method comprises the following steps: pouring hot converterslag in a slag ladle into a reaction furnace by virtue of a buffer stage, and heating to a temperature of 1450 DEG C or higher by using the electrode; respectively injecting iron tailings and blast furnace dusting ash into the reaction furnace by virtue of high-pressure carrier gases by using the auxiliary material spray gun and the reducing agent spray gun, reducing ferric oxides in the converter slag and the iron tailings, producing bubbles to stir, maintaining the temperature for 20 minutes or longer, allowing standing still for 5-7 minutes, slagging-out, tapping iron, and naturally cooling molten iron to obtain an iron alloy; cooling the finished slag, wherein the finished slag has a vitrification ratio of not lower than 80% and is directly used for preparing the cement admixture, andthe recycled hot air is used for raw material preheating and drying.

Description

technical field [0001] The invention belongs to the technical field of reutilization of solid waste resources in the converter steelmaking process, and in particular relates to a device and a preparation method for preparing cement mixture using blast furnace dust, mine iron tailings and converter slag produced by iron and steel enterprises as raw materials. Background technique [0002] Converter slag is an industrial solid waste produced during the converter steelmaking process. For every ton of steel produced, 0.1-0.13 tons of steel slag is produced by-product, and its sensible heat is 2000-2200kJ / kg. Converter slag also contains 10% to 30% total iron (TFe) and a large amount of beneficial elements such as calcium, magnesium and silicon. Therefore, increasing the recovery and utilization of converter slag resources is an important way to reduce smelting costs in steel mills and achieve zero waste discharge. main means. [0003] At present, the existing main treatment me...

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Problems solved by technology

The reducing agent used in the two articles is graphitic carbon, which is difficult to obtain economic benefits in large-scale industrialization

[0010] The above patents and papers introduce the existing methods for the treatment and reuse of converter slag, most of which are methods of carbothermal reduction of iron oxides or magnetic separation to remove iron-containing substances in slag, and the sensible heat of converter slag has not been recovered. At the same time, most of the above studies For laboratory research, there is no basis for process implementation or practice. At the same time, in view of the problem of large annual output and serious accumulation of converter slag, the processing capacity of the above process is obviously not enough, far from meeting the processing capacity requirements of converter slag or steel mills

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