A METHOD OF DECOMPOSING GYPSUM TO SULFUR DIOXIDE AND THE APPARATUS THEREOF

WIPO Patent Application WO/2002/018270

A1

The present invention relates to a method of decomposing gypsum to sulfur dioxide, and the apparatus thereof. The apparatus comprises a set of four-stage cyclone preheater and a rotary kiln for decomposing and calcining. In the four-stage cyclone preheater, the off-gas of the kiln conducts heat-exchange with materials. By such processing, the exchange efficiency is high, and gypsum which contain 10-25 % water can be directly used for preparing crude materials. The entrance temperature of the preheated materials can be up to 600-720 °C, while the temperature of the off-gas can be decreased to 260-400 °C, so that heat utilization ratio is high, and the cost of the apparatus can be cut down. The concentration of SO¿2? in the off-gas may be up to 11-14 %, so that two-conversion two-adsorption process can be employed for preparing sulfuric acid.

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FENG YISHENG (CN)
FENG JIUTIAN (CN)
LIU XIGANG (CN)
WANG YURUI (CN)
LU TIANBAO (CN)

PCT/CN2001/000811

March 07, 2002

May 18, 2001

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SHANDONG LUBEI ENTPR GROUP COM (CN)
FENG YISHENG (CN)
FENG JIUTIAN (CN)
LIU XIGANG (CN)
WANG YURUI (CN)
LU TIANBAO (CN)

C01B17/50; C01F11/08; F27B7/02; F27B7/20; F27D17/00; (IPC1-7): C01B17/52; C04B7/04; C04B11/26; F27B7/00

WO1993010884A1

1993-06-10

CN1079724A	1993-12-22
CN1040009A	1990-02-28
CN1161943A	1997-10-15

LUNG TIN INT'L PATENT & TRADEMARK AGENT LTD. (Tower B. Grand place No. 5 Huizhong Roa, Chaoyang District Beijing 1, CN)

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