2020年5月1日星期五

Talking About Past and Present -- Flotation

Flotation, also known as flotation separation, is a method of separating useful minerals from ores according to the physical and chemical properties of mineral particles.

In the 18th century, it was known that the gas adhered solid particles rose to the surface of the water; In the 19th century, people used gasification (boiled pulp) or acid and carbonate minerals generated by the reaction of flotation graphite flotation. In the late nineteenth Century, due to the increasing demand for metals, the resources of coarse lead, zinc and copper sulfide ores were reduced gradually, in Australia, the United States and some European countries, flotation has been used to fine grained ores to provide concentrates for smelting.

At the beginning of the industrial age, the most widely used flotation method is the total oil flotation, it is based on the oily and hydrophilic nature of the mineral and is stirred by adding a large amount of oil to the pulp, the lipophilic mineral sticking to the oil layer is scraped out and separated from the hydrophilic gangue minerals. This method began in 1898 for the treatment of lead and zinc sulfide industrial production, but because of small production capacity, poor sorting, fuel consumption costs, and soon be eliminated.

flotation image

In 1902, the Americans proposed a method of pellet flotation, in a small amount of oil and soap agents under the conditions of the slurry in the sulfide ore selective flocculation into pellets, thus, the dispersed gangue can be washed away and separated from the aggregate minerals. This method once replaced the whole oil flotation, but it seems that the time is not long.

The froth flotation process, which we have been using since 1924, is derived from the popularity of flotation reagents. It is the selective separation of solid gas from the suspension of water (pulp) into the solid mineral, and is the selective separation process of the gas liquid solid three-phase interface, foam flotation has been called "miraculous invention" in the history of mineral smelting science and technology, and opened a new era of modern flotation methods.

Now, with the progress of industry, our tungsten ore flotation technology is changing with each passing day, but it is still the category of foam flotation. With the flawless beneficiation of chemicals used, flotation of new methods and new concepts are also constantly invented and created, in the accumulation of a large number of technology, China's tungsten flotation field developing, accumulate steadily, industry technology has been in the international leading position. Even some of the western countries, which have been proud of themselves, have turned their back on copy the flotation method of our country.

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