Method for acid-leaching gallium from coal ash through microwave heating

Abstract

The invention discloses a production process for floating gallium from coal ash. The production process comprises the following steps: a, adding a certain amount of coal ash of Qinghai Western Mining Industry Tanghu Power Plant into a floatation machine, wherein the gallium content of the coal ash is 25 g / ton; b, adding a certain amount of floatation regulator such as sodium silicate, octadecylamine floatation agent and foaming agent such as 2# oil into the floatation machine; c, performing floatation at room temperature by a rough sweeping floatation process; and d, obtaining the gallium concentrate, wherein the gallium grade is 40 g / ton and the recovery rate is 90 percent. By the production process, the problems of high recovering cost, high consumption of raw materials and serious environmental pollution caused by relatively low gallium content of the coal ash, large treatment quantity of direct acid-leaching and alkali-leaching process and large quantity of required leaching liquid in the conventional process for directly leaching the gallium from the coal ahs are solved; and by the process for floating the gallium from the coal ash, the quantity of mine to be treated is reduced by 50 percent under the condition of slightly reducing the recovery rate, and the leaching cost is greatly saved.

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 230 g / t, and the potential economic value is very considerable. According to statistics, my country's output of fly ash in 2000 reached 150 million tons, and gallium could be extracted from 1,800 to 34,500 tons. According to 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 poin...

AI Technical Summary

Problems solved by technology

[0009] 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