Process and device for preparing fumed silica and recovering metal with nickel tailings as raw material

Abstract

The invention provides a process for preparing fumed silica and recovering metal with nickel tailings as a raw material. In the process, the nickel tailings and other kinds of waste are used as the raw material and react with fluorine-containing acid liquor, hydrochloric acid and nitric acid to prepare high-value-added products fumed silica and recover metal such as gold, silver, copper and iron, the content of SiO2 in the prepared product is larger than 99.9%, the specific area measured through a multi-point BET method is 350 m<2> / g or more, and the effect of turning waste into wealth is achieved. Acidic gas generated in the preparation process is absorbed through a negative pressure water absorbing tank to prepare corresponding acidic liquid, and when concentrated to certain concentration, the acidic liquid can be used circularly. The invention further provides a production device used in the process, parts used in the production device are common tools used in a chemical plant and low in cost, and large-scale industrial production can be achieved.

Description

technical field [0001] The invention relates to a process method and a device for preparing gas-phase white carbon black from nickel tailings and recovering metal, and belongs to the technical field of chemical purification and environmental protection. Background technique [0002] According to relevant literature and information: my country is rich in nickel resources, with reserves of about 6.7 million tons, of which copper-nickel sulfide ore accounts for about 91% of the total reserves, nickel oxide ore accounts for 9%; 80% of nickel sulfide ore is distributed in Jinchuan, Gansu Copper-nickel deposits, the rest are distributed in Xinjiang, Yunnan, Sichuan, Jilin, Heilongjiang, Guangxi, Inner Mongolia, Shaanxi and Qinghai; nickel oxide deposits are mainly distributed in Panzhihua area in southwest Sichuan and Yuanjiang area in Yunnan, due to its low nickel grade , is currently only mined on a small scale. With the reduction of nickel resources and the continuous growth of ...

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Problems solved by technology

[0005] The invention provides a process and device for preparing gas phase white carbon black and recovering gold, silver, copper, iron and other metals using nickel tailings as raw material; The process of hydrogen, oxygen and high-temperature hydrolysis also solves the problem that the current nickel tailings cannot be efficiently utilized. The present invention also provides a new process technology and production device that can produce gas-phase silica products under normal temperature and pressure.

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