A method for producing an expanded granulate made of a sand grain-shaped mineral material uses a propellant. The material is transported along a transport path through multiple heating zones in a furnace shaft, heated to a critical temperature at which the surfaces of the sand grains plasticize, and the sand grains are expanded based on the propellant. The material is fed from the bottom together with an amount of air; the material is transported from the bottom to the top along the transport path by the air quantity which flows from the bottom to the top in the furnace shaft and the sand grains are expanded in the upper half of the transport path. The material is heated such that the material immediately prior to entering into the furnace shaft is at a material entry temperature lower than the critical temperature and higher than the ambient temperature.

The invention discloses a multi-stage suspension magnetizing roasting-magnetic separation system and method for refractory iron ore, which belongs to the field of mineral processing technology. This system comprises multistage suspension preheater, multistage suspension oxidizer, multistage suspension redactor, on-line grade analyzer, ore-like splitter, magnetic separator, dust remover, roots blower and other components and connection modes. The refractory iron ore treated by the present method can be produced to homogeneous magnetite or maghemite accurately, and through magnetic separation, on-line grade analyzer detection and ore-like splitter, the concentrate powder which reach the set grade can be obtained, and the unqualified ore powder enters the next stage of oxidation-reduction-magnetic separation-split treatment. Through the present system and method, products with different roasting quality can be obtained, and can avoid the phenomenon of over burning or under burning occurring in the past process and equipment.

A system for conditioning stucco particulate material includes a vessel having separation chamber in communication with a holding chamber having a holding volume therein. The conditioning system includes the holding volume sufficient to condition the stucco particulate material therein and/or a control system configured to delay discharge of the stucco particulate material from the holding chamber. The system for conditioning stucco particulate material is configured to increase residence time of the stucco particulate material in the holding chamber to promote calcining conditioning therein.

Invention relates to a vertical ring shaft kiln comprising a vertical burning region (1); an intermediate sintering zone (Z.sub.3) surrounded by a first wall (10) and an opposite second wall (20) at the burning region (1) to obtain a clinker from a particulate raw material flowing downwards direction.

A furnace may include at least two vertical shafts, each of which may have at an upper end thereof an inlet for material to be burnt and at a lower end thereof a burnt material outlet. The inlet and the outlet may be connected by a transfer channel. In each case, at least one main burner may be positioned above the transfer channel, and a cooling gas inlet may be positioned below the transfer channel. At least one additional burner may be positioned below the transfer channel in each of the shafts. Such a furnace can be operated such that the material to be burnt in the currently fired shaft is at least partially calcined in a main burning zone above the transfer channel, and then thermally aftertreated in an additional burning zone positioned between the transfer channel and the additional burner.

A carbon baking furnace has at least one vertical baking shaft with a system and method for positioning green carbon bodies to be baked at the top of the vertical baking path and ringing the green carbon bodies with a sacrificial medium such as packing coke. The disclosure provides a system and method for controlling the delivery and removal of the sacrificial medium used to surround the carbon bodies within the baking paths. A volatile extraction system and method are provided. A system and method for unloading baked carbon bodies is disclosed.

A melter melts particulate hot melt adhesive into a liquefied form. The melter includes a heated receiving device having an interior with an inlet that receives the particulate hot melt adhesive and an outlet. The heated receiving device melts the particulate hot melt adhesive and directs the liquified hot melt adhesive to the outlet. A prepackaged container holds a supply of the particulate hot melt adhesive and includes an outlet. A particulate hot melt adhesive feed device allows the particulate hot melt adhesive to be directed from the outlet of the prepackaged container to the inlet of the heated receiving device.

A melter melts particulate hot melt adhesive into a liquefied form. The melter includes a heated receiving device having an interior with an inlet that receives the particulate hot melt adhesive and an outlet. The heated receiving device melts the particulate hot melt adhesive and directs the liquified hot melt adhesive to the outlet. A prepackaged container holds a supply of the particulate hot melt adhesive and includes an outlet. A particulate hot melt adhesive feed device allows the particulate hot melt adhesive to be directed from the outlet of the prepackaged container to the inlet of the heated receiving device.

A melter for heating and melting particulate hot melt adhesive into a liquefied form is disclosed. The melter includes a heated receiving device having an interior with an inlet configured to receive the particulate hot melt adhesive and an outlet. A flexible hopper holds a supply of the particulate hot melt adhesive and a particulate hot melt adhesive feed device allows the particulate hot melt adhesive to be directed from the flexible hopper to the inlet of the heated receiving device.

A melter for heating and melting particulate hot melt adhesive into a liquefied form is disclosed. The melter includes a heated receiving device having an interior with an inlet configured to receive the particulate hot melt adhesive and an outlet. A flexible hopper holds a supply of the particulate hot melt adhesive and a particulate hot melt adhesive feed device allows the particulate hot melt adhesive to be directed from the flexible hopper to the inlet of the heated receiving device.