|  | B |
SECTION B — PERFORMING OPERATIONS; TRANSPORTING

SEPARATING; MIXING

|  | B01 - B09 |
Note(s) The following notes are meant to assist in the use of this part of the classification scheme; they must not be read as modifying in any way the elaborations. In this sub-section, the separation of different materials, e.g. of different matter, size, or state, is predominantly found in the following subclasses: Fulltext... Hierarchy... Expanded...B01D Fulltext... Hierarchy... Expanded...B03B, Fulltext... Hierarchy... Expanded...B03C, Fulltext... Hierarchy... Expanded...B03D Fulltext... Hierarchy... Expanded...B04B, Fulltext... Hierarchy... Expanded...B04C, Fulltext... Hierarchy... Expanded...B07B, Fulltext... Hierarchy... Expanded...B07C. The classifying characteristics of these subclasses are: the physical state of the matter to be separated; the principle of the process used; particular kinds of apparatus. The first of these characteristics involves six different aspects, assembled in three groups: liquid/liquid or liquid/gas and gas/gas; solid/liquid or solid/gas; solid/solid. These subclasses are to be used according to the following general rules: Fulltext... Hierarchy... Expanded...B01D is the most general class as far as separation other than solids from solids is concerned. Apparatus for separating solids from solids are covered by Fulltext... Hierarchy... Expanded...B03B when the process concerned is regarded as the equivalent of "washing" in the sense of the mining art, even if such apparatus is a pneumatic one, especially pneumatic tables or jigs. Screens per se are not covered by this subclass but are classified in Fulltext... Hierarchy... Expanded...B07B, even if they are being used in a wet process. All other apparatus for the separation of solids from solids according to dry methods are classified in Fulltext... Hierarchy... Expanded...B07B. If the separation takes place as a result of the detection or measurement of some feature of the material or articles to be sorted it is classified in Fulltext... Hierarchy... Expanded...B07C. It should also be noted that the separation of isotopes of the same chemical element is covered by Fulltext... Hierarchy... Expanded...B01D 59/00, whatever process or apparatus is employed. The following scheme illustrates the classification according to these rules.

|  | B04 |
CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES

|  | B04 |
Note(s) Attention is drawn to the Notes following the subsection title "SEPARATING; MIXING" [pages 10 and 11]

|  | B04C |
APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES (jet mills Fulltext... Hierarchy... Expanded...B02C 19/06; cyclonic type combustion apparatus Fulltext... Hierarchy... Expanded...F23)

|  | B04C |
Note(s) This subclass covers apparatus for separating, mixing or like treating in which centrifugal effects are generated by free vortex flow, otherwise than by rotary bowls, rotors or curved passages.

|  | B04C 1/00 |
Apparatus in which the main direction of flow follows a flat spiral

|  | B04C 3/00 |
Apparatus in which the axial direction of the vortex remains unchanged

|  | B04C 3/02 |
· | with heating or cooling, e.g. quenching, means

|  | B04C 3/04 |
· | Multiple arrangement thereof

|  | B04C 3/06 |
· | Construction of inlets or outlets to the vortex chamber

|  | B04C 5/00 |
Apparatus in which the axial direction of the vortex is reversed

|  | B04C 5/02 |
· | Construction of inlets by which the vortex flow is generated (fluid dynamics in general Fulltext... Hierarchy... Expanded...F15D)

|  | B04C 5/04 |
· · | Tangential inlets

|  | B04C 5/06 |
· · | Axial inlets

|  | B04C 5/08 |
· | Vortex chamber constructions

|  | B04C 5/081 |
· · | Shapes or dimensions

|  | B04C 5/085 |
· · | with wear-resisting arrangements

|  | B04C 5/087 |
· · | with flexible gas-tight walls

|  | B04C 5/10 |
· · | with perforated walls

|  | B04C 5/103 |
· · | Bodies or members, e.g. bulkheads, guides, in the vortex chamber (cores Fulltext... Hierarchy... Expanded...B04C 5/107)

|  | B04C 5/107 |
· · | Cores; Devices for inducing an air-core in hydrocyclones (forming part of the outlet pipe Fulltext... Hierarchy... Expanded...B04C 5/13)

|  | B04C 5/12 |
· | Construction of the overflow ducting, e.g. diffusing or spiral exits

|  | B04C 5/13 |
· · | formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow

|  | B04C 5/14 |
· | Construction of the underflow ducting; Apex constructions; Discharge arrangements

|  | B04C 5/15 |
· · | with swinging flaps or revolving sluices; Sluices; Check-valves

|  | B04C 5/16 |
· · | with variable-size outlets from the underflow ducting

|  | B04C 5/18 |
· · | with auxiliary fluid assisting discharge

|  | B04C 5/181 |
· · | Bulkheads or central bodies in the discharge opening

|  | B04C 5/185 |
· · | Dust collectors

|  | B04C 5/187 |
· · · | forming an integral part of the vortex chamber

|  | B04C 5/20 |
· | with heating or cooling, e.g. quenching, means

|  | B04C 5/22 |
· | with cleaning means

|  | B04C 5/23 |
· · | using liquids

|  | B04C 5/24 |
· | Multiple arrangement thereof

|  | B04C 5/26 |
· · | for series flow

|  | B04C 5/28 |
· · | for parallel flow

|  | B04C 5/30 |
· · | Recirculation constructions in or with cyclones which accomplish a partial recirculation of the medium, e.g. by means of conduits

|  | B04C 7/00 |
Apparatus not provided for in group Fulltext... Hierarchy... Expanded...B04C 1/00, Fulltext... Hierarchy... Expanded...B04C 3/00 or Fulltext... Hierarchy... Expanded...B04C 5/00; Multiple arrangements not provided for in one of the groups Fulltext... Hierarchy... Expanded...B04C 1/00, Fulltext... Hierarchy... Expanded...B04C 3/00, or Fulltext... Hierarchy... Expanded...B04C 5/00; Combinations of apparatus covered by two or more of the groups Fulltext... Hierarchy... Expanded...B04C 1/00, Fulltext... Hierarchy... Expanded...B04C 3/00, or Fulltext... Hierarchy... Expanded...B04C 5/00

|  | B04C 9/00 |
Combinations with other devices, e.g. fans (with filters Fulltext... Hierarchy... Expanded...B01D 50/00)

|  | B04C 11/00 |
Accessories, e.g. safety or control devices, not otherwise provided for (with electrostatic precipitating arrangements Fulltext... Hierarchy... Expanded...B03C 3/14)