Introduction to ore flotation development
Large-scale industrialization of flotation in the late 19th century was gradually developed in ancient silver and gold panning process, it has been recognized or different natural hydrophobic (lipophilic) use of fossil hydrophilic purified mineral raw material.
(1) Full oil flotation method. According to the different lipophilicity and hydrophilicity of various minerals, a large amount of oil is mixed with the slurry, and then the oleophilic minerals which are attached to the oil layer are scraped off, and the hydrophilic mineral remains in the slurry to achieve separation. The purpose of the mineral. Such a party
France in 1898 for the industrial production of lead-zinc sulphide ore.
(2) Surface flotation method. Using the principle of surface tension, the grinding dry powder is gently removed on the surface of the flowing water stream, and the hydrophobic mineral is not easily wetted and floats on the water, and is integrated into a thin layer to become a concentrate and a hydrophilic gangue which is easily wetted by water. mineral the sink, so as to achieve separation, because it is so called skin was divided mineral flotation on water and air interface. This method was industrially applied in copper sulfide floatation in 1907.
The above two methods have not been widely applied due to their small production capacity, poor sorting effect, and large oil and drug consumption.
(3) Foam flotation method. The use of bubbles to dry up useful minerals, floating to form a mineralized foam, to achieve separation from the gangue, so called foam flotation. This method was first used in Australia to treat 20% zinc-containing re-selected tailings. At that time, the dry tailings were added to the dilute sulfuric acid solution. Since the tailings contained carbonate-like gangue, calcium carbonate reacted with sulfuric acid to emit carbon dioxide. bubble, sphalerite to bubbles adhering to the surface of the float, floating foams scraped off, resulting in 42% of zinc concentrate.
Foam flotation has now become the main flotation method.
(4) The role of flotation reagents. Due to the discovery and application of flotation agents, many minerals that were thought to be difficult to float have been adjusted by flotation agents to become floatable or easy to float minerals. In the development of flotation, the application and development of pharmaceuticals has played a huge role in promoting.
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