Central South University

Qingwei Wang

Liyuan Chai

Qingzhu Li

Xiaobo Min

Hui Liu

Zhang Lin

Meiqing Shi

Fangfang Zhu

Kaisong Xiang

Guomin Jiang

Zhihui Yang

Fenghua Shen

Weichun Yang

Xudong Liu

Weirong Gao

Lin Wu

Chengyun Zhou

Huimin Yi

Haiying Wang

A method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction includes electrochemically reducing sulfur dioxide absorbed in an aqueous solution into gaseous hydrogen sulfide with a membrane electrode, resulting in efficient and selective conversion of the sulfur dioxide absorbed in the aqueous solution into the hydrogen sulfide to avoid a deactivation of a cathode due to colloidal sulfur produced on the cathode and adhesion onto a surface of the cathode, wherein the method is carried out at ambient temperature and normal pressure without addition of a reducing agent, having no waste salts produced, and is simple in operation, and is convenient for large-scale application.

Method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction

The invention provides a complete set of treatment system and method for deep utilization of dolomite resources. The system includes a primary calcination device, a carbon dioxide capture device, a digestion device, a carbonization separation device, a pyrolysis device and a secondary calcination device; the primary calcination device includes a dolomite calciner, a plurality of hoardings and an exhaust pipe, and an exhaust chamber is formed between the hoardings, the top of the dolomite calciner and the outer wall of the blanking bin; the exhaust chamber is in communication with the carbon dioxide capture device through the exhaust pipe; the carbonization separation device includes a carbonization reaction tank whose gas inlet is in communication with the gas outlet of the carbon dioxide capture device; and the pyrolysis device includes a pyrolysis kettle and a vacuum pump which maintains a negative pressure state in the pyrolysis kettle.

Treatment system and method for deep utilization of dolomite resources

A method and an apparatus for recovery and deep treatment of a polluted acid. The method comprises the following main steps: (1) selectively adsorbing rare and noble metals, such as rhenium, selenium and the like; (2) separating copper from arsenic to recover the copper; (3) carrying out efficient vulcanization to perform deep arsenic removal; (4) carrying out electrodialysis to pre-concentrate acid; (5) evaporating and concentrating the acid; (6) carrying out an air-stripping method to remove fluorine and chlorine. The polluted acid treatment apparatus mainly comprises a precision filtering tank, a special adsorbing tank, a copper-arsenic separation device, a vulcanization device, an electrodialysis device, an evaporative concentration device, and an air-stripping device. The method and the apparatus can implement efficient recovery of valuable elements in polluted acid wastewater and separate treatment harmful elements, has obvious economical, social and environmental benefits, and has wide application prospects.

Method and apparatus for the recovery and deep treatment of polluted acid

Growing community of inventors

Hunan, China

Qingwei Wang