JP2012500902A5

JP2012500902A5 -

Info

Publication number: JP2012500902A5
Application number: JP2011524530A
Authority: JP
Filing date: 2009-08-28
Publication date: 2012-07-05
Anticipated expiration: 2029-08-28

Claims

In an improved method for treating high zinc content iron ore to produce steel,
An agglomerate comprising a mixture of an iron oxide having an average particle size of 35 to 70 μm, a carbonaceous material having an average particle size of 25 to 60 μm, and a flux having an average particle size of 45 to 85 μm is generated, and an organic binder and an inorganic bond are produced. Forming agglomerates with a particle size of 8-15 mm using the combination with the material and moisture to achieve the desired properties of the agglomerates;
Dezincing and metallizing the agglomerates in a furnace;
Melting the reduced agglomerates under hot charging conditions and cold charging conditions to form hot metal, and producing crude steel;
Recovering valuable zinc from the waste gas stream of the furnace by performing a conventional zinc extraction process;
Comprising the above method.

The desired properties of the agglomerates include wet drop number in the range of 6-8, dry drop number in the range of 10-15, unfired crush strength of 1.5 kg / pellet, and dry crush of 15 kg / pellet. The method of claim 1, comprising: strength.

The steps of dezincing and metallization are as follows:
A step of continuously adjusting the porosity of the agglomerates (primary gap) during the water evaporation at a temperature of 80 ° C. to 150 ° C .;
Evaporating the organic binder at a temperature between 130 ° C. and 300 ° C. to create a second gap;
Depleting the carbonaceous material in a reduced state at a temperature between 500 ° C. and 1200 ° C. to create a tertiary gap;
The method of claim 1 comprising:

The steps of dezincing and metallization are as follows:
4. The method of claim 1 or 3 , further comprising providing a gap channel for rapid delivery of gas products by selecting an average particle size of the components that form the agglomerates. .

The steps of dezincing and metallization are as follows:
Controlling the viscosity of the formed slag by the combination of fluxes so as to avoid clogging of the gap channel, allowing the gas product to be released smoothly. The method of claim 1, further comprising:

The method of claim 1, wherein the furnace is selected from the types of rotary hearth furnaces, non-shaft furnaces and multi-hearth furnaces.

The iron oxide is iron ore containing a high zinc concentration in the range of 0.01 to 1% derived from iron ore, electric arc furnace dust, factory waste, and combinations thereof. the method of.

The method of claim 1, wherein the carbonaceous material comprises anthracite, bituminous coal, caking coal, petcoal, coke breeze, other carbonaceous materials, and combinations thereof.

The binder includes an inorganic binder, an organic binder, and a combination thereof, and the inorganic binder is used at a dose of 0.5 to 2%. The method of claim 1, wherein the method is used at a dose between ˜5%.

10. The method of claim 1 or 9 , wherein the organic binder comprises dextrin, cellulose, starch, flour, and combinations thereof, monoacrylates, polyacrylates, and acrylamides, and combinations thereof, gums such as guar gum. .

The method according to claim 1 or 9 , wherein the inorganic binder comprises bentonite, colloidal silica, swollen clay, and combinations thereof, cement, sodium, silicate.

The step of generating the agglomerates includes
Preparing feed materials (iron ore, coal, binder and flux) to achieve the required particle size and particle size distribution, including surface area;
Formulating and mixing said feed fines, pre-wetting to achieve the necessary mixing for agglomeration;
Preparing the agglomerates in a dish and drum granulator or briquette maker having the desired moisture level and process parameters to achieve the desired properties and quality of the agglomerates;
Drying the agglomerates in a temperature range of 110 to 300 ° C. to remove the moisture and forming a primary gap;
The method of claim 1 comprising:

The dezincification and metallization is performed in a furnace where different temperatures are maintained in different zones, thereby removing the organic binder in the initial stage to form interconnected gap channels. And then reducing and evaporating the zinc at a higher temperature.

The method of any one of claims 1-5, wherein the flux minimizes the loss of the Fe in the slag.

The flux, CaO, oxides of MgO and SiO _2, as well, comprises those compounds, method of any one of claims 1, 12 and 14.

The zinc valuables are separated from the waste gas stream of the furnace by lowering the temperature of the waste gas below 900 ° C. and adjusting the CO / CO ₂ ratio of the waste gas with the introduced air. The method of claim 1, wherein:

The separated zinc valuables are treated in a furnace to increase the zinc concentration in the product recovered from the waste gas stream, and the compound recovered from the waste gas stream is 40 17. A method according to claim 16, having a zinc content greater than% and being adapted to extract zinc by conventional processes.

An improved method for processing high zinc content iron ore for manufacturing steel, substantially as described and exemplified herein with reference to the accompanying drawings.