Method for the production of liquid pig iron or steel directly of dressed ore专利检索-碳抵消污染与排放控制专利检索查询-专利查询网

Method for the production of liquid pig iron or steel directly of dressed ore

阅读：486发布：2021-03-27

专利汇可以提供Method for the production of liquid pig iron or steel directly of dressed ore专利检索，专利查询，专利分析的服务。并且In a reduction process wherein liquid ferrous metal is covered by an iron oxide-containing slag layer and wherein ironcontaining solids are supplied to the slag from above, the smelting is favorably influenced by the direct supply of an oxygen-containing gas directly into the slag layer to such a depth therein that reducing gas formed in the layer and moving upwardly through the same is converted largely to carbon dioxide and/or water, the supply of reduction means into the iron bath being adjusted to counteract any insufficiency of carbon content in the bath.，下面是Method for the production of liquid pig iron or steel directly of dressed ore专利的具体信息内容。

权利要求

2. A method according to claim 1, in which a slag rich in iron oxide is added having a relation (Ca2 + Mg2 + Fe2 + Fe3 )/Si2 exceeding 1.

3. A method according to claim 1, wherein an oxidizing material selected from the group consisting of oxygen, air, and iron-bonded oxygen is supplied to the upper portion of the slag cover in such a quantity that, independently of reducing gases flowing from below, there is maintained all over the slag area a layer being at least 10 cm thick and having an oxidation rate Fe3 /(Fe3 + Fe2 ) exceeding 0.20, preferably between 0.30 and 0.67.

4. A method according to claim 1, in which the oxygen-containing gas is a member of the group consisting of air, oxygen, oxygen-enriched air or an inert gas enriched with oxygen.

5. A method according to claim 4, wherein the oxygen-containing gas is preheated to a temperature of at least 400* C.

6. A method according to claim 1, in which a reducing agent selected from the group consisting of coke powder, mineral oil, natural gas, cracking gases, producer gas and water gas is added as reduction means.

7. A method according to claim 1, in which the reduction means, the oxygen-containing gas and the iron-containing material are supplied in such proportions that the height of the oxidized slag layer is maintained substantially constant and that the iron bath obtains at a desired temperature a carbon content of about 4 percent and that the quantity of carbon-containing reduction means increases on decreasing carbon content and decreases on increasing carbon content, that the quantity of oxygen-containing gas increases on decreasing temperature and decreases on increasing temperature and that the quantity of iron-containing material decreases on decreasing height of the oxidized slag layer and increases on increasing height of said layer.

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Method for the production of liquid pig iron or steel directly of dressed ore

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