Disclosed are a calcining technology and a calcining device for producing high-brightness and low-
hardness talc by utilizing black
talc. The calcining technology comprises the following steps: smashing and milling to enable grain
fineness of a black
talc raw material to be 150 to 8000 meshes; feeding the milled black talc
raw material into the calcining device for calcining, wherein calcining temperature is 200 to 850 DEG C, and calcining time is 2 to 8h; and introducing high-concentration and high-pressure
oxygen in a calcining process to form an oxidizing
atmosphere, wherein
oxygen concentration is 30 to 80 percent, and
oxygen pressure is 0.05 to 0.7 MPa. The calcining device comprises a feeding mechanism, a
rotary kiln and a discharging mechanism; a rotary cylinder of the
rotary kiln is horizontally arranged rotatably, and comprises a feeding section, a heating section and a discharging section; the feeding section and the feeding mechanism are connected, and the discharging section and the discharging mechanism are connected; the
rotary kiln comprises a
combustor and also comprises an oxygen support ring, wherein the
combustor is used for heating to calcine the powdery black talc
raw material in the heating section, and the
oxygen supply ring sheathes the feeding section, and is provided with an oxygen inlet and an oxygen chamber; a plurality of
oxygen supply hoods are arranged in the rotary cylinder; and an oxygen hole is formed in each
oxygen supply hood, and is in gas communication with the oxygen supply ring. According to the calcining technology and the calcining device disclosed by the invention, lower temperature
calcination is performed under the oxidizing
atmosphere, so that the talc does not produce
phase change and is high in brightness.