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The process of making discrete metallized pellets which includes the steps of:forming a mixture of fines of iron oxide, a carbonaceous material, and a fluxing material,<a href="">portable gold ore crusher</a>, the carbonaceous material containing carbon. in amount sufficient to reduce of the iron oxide to free metal,(b) forming moistened pellets of said mixture having an average diameter of about -1.5 inch, inch,(c) charging said moistened pellets to an endless conveyor at a depth of from 3 to 20 inches, to form a bed of moist pellets,(d) drying said bed by passing recycle gases therethrough at a temperature of from about 300 F. to about 600 F.,(e) heating said bed by passing oxidizing gases therethrough to raise the temperature of said bed to between about 1000" F. to 2000 F.,(f) subsequently heat soaking and metallizing said bed by passing non-reactive gases containing not more than 5% of oxygen by weight, through the burden to raise its temperature to a maximum of about 2400 F. for a period of time sufficient to reduce from 60% to no more than about 90% of the chemically combined iron in said mixture to metallic iron, and quenching said metallized pellets in water.

I a citizen of the United States, residing at Los Angeles, in the county of- Los Angeles and" State of California, have invented a new and useful Aero Ore-Concentrator and Placer-Machine, of which the following is a specification. I The object of this invention is to provide '10 light, readily portable, cheap, strong,<a href="">grinding ball mills</a>, and highly-effective means for separating minerals from the materials in which they occur.This invention relates to the class of machines in which air is used to buoy up and carry 01f the wastem'aterials while the valuable minerals and heavy concentrates separate from the gangue bygravity and are delivered to a suitable-receptacle for'reductiojn. The machine is adapted for operation either manually or otherwise.

The accompanying drawings illustrate the invention.Figure 1 is a perspective view of a manually-operable ore-concentrator constructed in accordance with this invention. 'Fig. 2 is a plan of the concentrating table detached. The flexible concentrate discharge-tubes are shown hung 1113/ Fig. 3 a fragmental view partly in cross-section on line indicated at m", Fig. 2, looking toward the right. A flexible concentrate discharge-tube isshown released to discharge the concentrates. Fig.4 is a fragmntal view of a plurality'of the riflie-segments. Fig. 5 is a distorted view, partly in section, at right angles to the rifilesegments and partly in section lengthwlseof the chamber underneath the rifile-sections. This-view shows the air-inlet to said airchamber and outlets to the concentratetrough. Line w m Fig. 2, indicates. the line of'section. Fig. 6 is a SGCtIOII on line at.

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