Method for leaching gallium from fly ash acid by microwave heating

Abstract

The invention discloses a production process for gallium flotation in fly ash, which comprises the following steps: a. Take a certain amount of fly ash from Qinghai West Mining Tanghu Power Plant and add it to the flotation machine, and the powder Gallium content is 25 grams per ton in the coal ash; b. add a certain amount of flotation adjustment agent such as water glass, octadecylamine flotation agent and foaming agent such as No. 2 oil etc. in the flotation machine; c. adopt a coarse Flotation is carried out at room temperature in the one-sweep flotation process; d. Gain a gallium concentrate with a gallium grade of 40 g / t, and the recovery rate is 90%. The invention solves the problem that the gallium content in the fly ash that exists in the existing process of directly leaching gallium from the fly ash is relatively low, the processing capacity of the direct acid leaching or alkali leaching process is large, and the amount of leachate required is also large, resulting in High recovery cost, large consumption of raw materials, and serious environmental pollution. By using the fly ash flotation gallium process, the amount of ore to be processed can be reduced by 50% without reducing the recovery rate much, which greatly saves the cost of leaching. .

Description

technical field [0001] The patent of the present invention is a method for microwave acid leaching of gallium in fly ash to increase the gallium leaching rate and shorten the leaching time. Background technique [0002] In the earth's crust, gallium has no independent mineral deposits, and is mainly associated with other mineral deposits in a scattered form, such as lead-zinc ore, tin ore, aluminum ore, etc. The study found that the fly ash of the power plant is also rich in gallium, the content of gallium in the fly ash ranges from 12 to 230g / t, and the potential economic value is very considerable. According to statistics, the output of fly ash in my country reached 150 million tons in 2000, and 1,800 to 34,500 tons of gallium could be extracted. Based on the price of 4,300 yuan / kg, the output could be 7.74 billion to 148.35 billion yuan. It can be seen from this that the extraction of rare metals such as gallium from fly ash can become an important economic growth point....

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems of long leaching time, low leaching rate or high energy consumption and high equipment requirements when gallium is extracted from fly ash by conventional acid leaching or alkali leaching, the present invention proposes an acid leaching process using microwaves, thereby shortening the leaching time , a method to increase the leaching rate