阅读说明：本技术 利用铁水罐处理瓦斯灰和转炉泥的方法 (Method for treating gas ash and converter sludge by using hot-metal ladle ) 是由 周云花 但家云 寿擎 陈克武 杨耀明 汤勇 黄辉华 于 2019-11-06 设计创作，主要内容包括：利用铁水罐处理瓦斯灰和转炉泥的方法,工艺流程为原料干燥—原料配矿—混匀—打包装袋—投入铁水罐,包括以下步骤：(1)原料配矿：重量百分比为瓦斯灰40%~60%,转炉泥40%~60%,所述的瓦斯灰成分为TFe=15%~30%,Zn≤1.5%,C=25%~45%,粒度直径≤1mm的占90%以上,水分小于10%；转炉泥成分Tfe=50%~60%,Zn≥1.0%,C≤5.0%,粒度直径≤1mm的占90%以上；烘干后水分小于10%；配合料含炭C=20%~25%,含水量小于10%；(2)投入铁水罐：炼铁高炉出铁时在投放保温剂入口投放,投放时间在铁水罐注满铁水70%~80%时投放,预留5min让混合物在铁水罐中进行反应。(The method for treating the gas ash and the converter mud by using the hot-metal ladle comprises the following process flows of raw material drying, raw material ore blending, mixing, packaging and bagging, and hot-metal ladle throwing, and comprises the following steps of (1) raw material ore blending, wherein the weight percentages of the raw material ore blending comprise 40% ~% of gas ash and 40% ~% of converter mud, the gas ash comprises TFe =15% ~%, Zn is less than or equal to 1.5%, C =25% 3945%, more than 90% of the converter mud with the particle size diameter of less than or equal to 1mm and less than 10%, the converter mud comprises Tfe =50% 3960%, more than or equal to 1.0%, less than or equal to 5.0% of C and more than 90% of the converter mud with the particle size of less than or equal to 1mm, the water content after drying is less than 10%, the mixture contains carbon C =20% ~% and the water content of less than 10%, and (2) the hot-metal ladle is thrown at a heat preservation agent inlet when the hot-metal ladle is tapped from a blast furnace, the hot-metal ladle.)

1. The method for treating the gas ash and the converter mud by using the hot metal ladle comprises the following process flows of drying raw materials, blending the raw materials, uniformly mixing, packaging and bagging, and putting into the hot metal ladle, and is characterized by comprising the following steps of:

(1) the raw material ore preparation comprises, by weight, 40% ~% of gas ash and 40% ~ 60% of converter sludge, wherein the gas ash comprises, by weight, 40% ~% of TFe =15%, not more than 1.5% of Zn, not more than 25% of C3645%, more than 90% of converter sludge with the particle size diameter of not more than 1mm, and less than 10% of water, the converter sludge comprises, by weight, 50% ~% of Tfe, not less than 1.0% of Zn, not more than 5.0% of C, more than 90% of converter sludge with the particle size diameter of not more than 1mm, the water content after drying is less than 10%, the batch contains C =20% ~% of carbon;

(2) and (3) putting into a hot metal ladle, namely putting into a heat preservation agent feeding inlet when an iron making blast furnace taps iron, putting into the hot metal ladle when the hot metal ladle is filled with 70% of molten iron and ~ 80%, and reserving for 5min to allow the mixture to react in the hot metal ladle.

Technical Field

The invention belongs to the technical field of comprehensive utilization of solid waste materials, and particularly relates to a method for treating gas ash and converter sludge by using a hot metal ladle.

Background

With the rapid development of the steel industry, steel plants produce a large amount of solid waste materials, such as blast furnace dust, converter sludge, and the like. Because the solid wastes contain a large amount of elements harmful to steel smelting and steel products, such as zinc, lead, potassium, sodium, chlorine and the like, the solid wastes cannot be simply matched with the sintering process for comprehensive utilization, and a new reasonable and effective comprehensive utilization method needs to be explored for the purpose.

At present, a plurality of methods are used for blast furnace gas ash and converter sludge, and the methods are commonly used as follows: the direct blending sintering method has lower content of harmful elements, and the blast furnace can bear the harmful elements and can be directly used as a sintering raw material; the cold-bonded pellet method is characterized in that gas ash, converter mud and the like are mixed in a certain proportion to produce cold-bonded pellets which are used as a coolant for steel making; the composite pellets produced by gas ash and converter mud are added into a hot metal ladle before tapping. A processing technology of Chinese saddle steel is introduced in the journal of Steel in 2016, 12 months: the metallurgical dust and mud are made into composite pellets with a double-layer structure, the composite pellets are added into a hot metal ladle, a good reduction effect is achieved, the composite pellets are preheated by using the waste heat of the hot metal ladle and the heat energy of molten iron, so that the composite pellets are subjected to self-reduction and micro-explosion reaction, more reaction interfaces, better dynamic and thermodynamic conditions are provided for the reduction reaction, and the high-efficiency comprehensive utilization of the iron-containing and zinc-containing dust and mud is realized. Other devices and processes are used to treat gas ash and converter sludge using rotary kilns, and the like.

Disclosure of Invention

The invention aims to provide a method for treating gas ash and converter mud by using a hot-metal ladle, which is improved on the basis of adding composite pellets into the hot-metal ladle, the gas ash and the converter mud are mixed according to a certain proportion to ensure that the C/O ratio of the gas ash and the converter mud reaches the heat preservation level of molten iron, the hot-metal ladle is put into the hot-metal ladle in the tapping process of the hot-metal ladle, and the purpose of comprehensively utilizing the gas ash and the converter mud and simultaneously obtaining the heat preservation of the molten iron is achieved.

In order to achieve the purpose, the invention adopts the technical scheme that:

the method for treating the gas ash and the converter mud by using the hot metal ladle comprises the following process flows of drying raw materials, blending the raw materials, uniformly mixing, packaging and bagging, and putting into the hot metal ladle, and comprises the following steps:

(1) raw material ore proportioning, wherein the raw material ore proportioning comprises, by weight, 40% ~ 60% of gas ash and 40% ~ 60% of converter sludge, wherein the gas ash comprises TFe =15% ~ 30%, Zn is not more than 1.5%, C =25% ~ 45% and is more than 90% of converter sludge with the particle size diameter of not more than 1mm, the water content is less than 10%, the converter sludge comprises TFe =50% ~ 60% of converter sludge, Zn is not less than 1.0%, C is not more than 5.0%, the particle size diameter of not more than 1mm is more than 90%, the water content after drying is less than 10%, the carbon content of a batch is C =20% ~ 25%, and the water content is less than 10%;

(2) and (3) putting the mixture into a hot metal ladle, namely putting the mixture into a heat preservation agent feeding inlet when an iron making blast furnace taps iron, putting the mixture into the hot metal ladle when the hot metal ladle is filled with 70% of molten iron and ~ 80% of molten iron for 3 ~ 7min, and allowing the mixture to react in the hot metal ladle.

The invention has the beneficial effects that:

(1) according to the method for mixing the gas ash and the converter mud and throwing the gas ash into the hot metal ladle, the gas ash contains 25-45% of carbon and is within 10% of water, the converter mud contains about 55% of iron and 20-30% of water (the converter mud is dried to be within 10% before use), the two substances are solid waste materials generated by steel enterprises, and the solid waste materials are prepared into the iron-containing and carbon-containing hot metal heat insulation material after being matched according to a certain proportion, so that heat can be provided for the hot metal to serve as a hot metal heat insulation agent, and meanwhile, the purpose of comprehensively utilizing the gas ash and the converter mud.

(2) The method can be carried out under the production process conditions of blast furnaces of all levels, is put into and utilized when the molten iron is discharged from the blast furnace, and can ensure that the quality of the molten iron and the temperature of the molten iron are not influenced. The invention is 1800m³The molten iron is used on a blast furnace, and is put into the blast furnace when a molten iron tank is filled with 75 percent of molten iron.

(3) The invention fully utilizes the characteristics of the gas ash and the converter sludge, the gas ash contains about 30 percent of carbon and can replace a heat preservation agent, the converter sludge contains iron, calcium, magnesium and zinc, wherein the iron, the calcium and the magnesium are beneficial elements, and the zinc is reduced and removed in the hot metal tank under the action of high-temperature molten iron and sufficient carbon and enters a furnace front dust removal system. The method not only treats solid waste materials such as gas ash, converter sludge and the like, but also replaces a molten iron heat insulating agent and simultaneously removes zinc in the converter sludge.

Drawings

FIG. 1 is a schematic diagram of the effect of material placement on the operation of a dedusting system.

Detailed Description

The present invention will be described in further detail with reference to examples.