阅读说明：本技术 铁矿石球团 (Iron ore pellets ) 是由 奈杰尔·皮克特 于 2018-04-18 设计创作，主要内容包括：本申请描述了包含颗粒状铁矿石和0.05重量％至1.0重量％的有机粘结剂的球团。还描述了这样的球团在电弧炉中生产钢的用途。(Pellets comprising particulate iron ore and 0.05 to 1.0 wt% of an organic binder are described. The use of such pellets in the production of steel in an electric arc furnace is also described.)

1. Pellets comprising particulate iron ore and from 0.05 to 1.0 wt%, typically less than 0.3 wt%, of an organic binder.

2. The pellet of claim 1, wherein the organic binder is a polymeric organic binder.

3. The pellet of claim 1 or 2, wherein the organic binder is selected from the group consisting of polyacrylamide resins, resole resins, novolac resins, polyvinyl alcohol, and polysaccharides.

4. The pellet of any one of the preceding claims, wherein the particulate iron ore is magnetic.

5. The pellet of claims 1-4, comprising a water repellent.

6. The pellet of claims 1-5, further comprising up to 20 wt% carbonaceous material.

7. The pellet of claims 1 to 6, wherein the particulate iron ore is capable of passing through a 100 μm mesh prior to pelletizing.

8. A method of producing steel comprising heating the pellets of claims 1-7 in an electric arc furnace.

9. The method of claim 8, wherein the pellets are heated under a reducing atmosphere.

10. The method of claim 9, comprising heating under a reducing atmosphere comprising hydrogen, shale gas, or natural gas.

11. A method according to claims 8 to 10, comprising mixing with scrap metal.

12. The process of claim 11 wherein up to 50% by weight of the pellets plus waste metal are formed from iron ore pellets.

13. A process for producing pellets according to claims 1 to 7, comprising mixing particulate iron ore with up to 0.3 wt% binder.

14. A method of producing steel comprising providing pellets according to claims 1-7, optionally produced by the method according to claim 13, transporting the pellets to an electric arc furnace and producing steel by the method according to claims 8-13.

Example (b):

5. the moisture content found in low grade hematite ore tailings of size 0 to 50 microns is 20%

To the ore was added 0.5% anionic polyacrylamide powder in the 500 micron size range and mixed in a high shear mixer. Trace amounts of surfactants such as SLS are added as an aid to production.

Extruded through a 15mm orifice using vacuum extrusion and cut to pellet size.

The moisture content before extrusion was 20% and after extrusion 16%.

The curing time was 24 hours at 25 ℃.

And (3) testing results: compressive strength>250kg/cm²

Static RDI 36 for ISO 4696-2

6. High grade magnetite concentrate having a density of 2.3 tons/m³To 2.5 tons/m³Graded from 0 to 100 microns and a moisture content of 13% +/-3%. When beneficiated into pellet grade, it is a typical characteristic of many hematite ores.

To the ore was added 0.2% synthetic thickener (e.g. hydroxyethyl methylcellulose with high molecular weight) and 0.5% water soluble novolac resin in powder form, which was then mixed in a high shear mixer.

Gums such as gum arabic, guar gum, and xanthan gum may also be used, but have been found to have a short shelf life in the field.

Extruded through a 15mm orifice using vacuum extrusion and cut to pellet size.

Strength of pellets after 24 hours curing at 25C>250kg/cm²。

The thermal stability at 550C and 900C was found to be:

550C/1 hr-retention > 50% strength

900C/1 hr-retention > 60% strength

PvOH may be added to the mixture at 0.1% to 0.2% to increase uncured and cured strength to>400kg/cm²。

7. Electric arc furnace dust from bag house

An alternative binder is a high molecular weight MHEC in the form of a 2% solution. Add 5% to 10% and mix with a high shear mixer.