Application example of iron ore anion collector floating silicon process

The anionic collector floating silicon process is required to be carried out in a strongly alkaline medium (pH=11.5 or so), adding an inhibitor of iron minerals (starch or lignosulfonate, etc.) and an activator of siliceous minerals (Ca++, etc.) to Fatty acids are used as collectors. Since the process is less sensitive to slime, it is possible to sort the iron ore without deliming. In the United States, Canada, the former Soviet Union and other countries from the 1960s on the low-grade iron oxide ore or semi-iron oxide ore for direct anion to the collector reverse flotation process test, the United States and Canada using starch as an inhibitor The former Soviet Union used lignin because of food shortages. Although the results of the United States and Canada have proved that the anti-flotation of anionic collector can also achieve the selection index of cationic collector reverse flotation, it is not due to the high cost of the former and the influence of concentrate filtration. Industrial application. The former Soviet Union study believes that the anion collector reverse flotation process directly treats low-grade iron ore, its cost of chemicals is high, lignin degradation is polluted by water quality, and iron concentrate is difficult to filter, so there has been no industry. Application report. According to reports, the former Soviet Union built an industrial test series in the Krivo Rouge Oxidation Mining and Production Company in accordance with the strong magnetic separation-anion reverse flotation process.

Since the 1970s, China has carried out research on the anion collector reverse flotation process for the poor red iron ore in Anshan. Due to the tight food supply at that time, the inhibitor used lignin sulfonate and in order to reduce the pharmacy. Cost, tends to reverse flotation of weakly magnetic and strong magnetic mixed coarse concentrates. During the "Seventh Five-Year Plan" period, China passed the technical research on the rational beneficiation process of Qidashan iron ore in Anshan Iron and Steel Co., Ltd., especially solved the problem of starch source. Finally, it was determined that the newly-built Tuanjuntai Concentrator used mixed-mine concentrate anion reverse flotation. Process, and built the first large-scale concentrator (9 million t/a ore) using anion reverse flotation process during the National Ninth Five-Year Plan. After several years of research, the iron concentrate grade of the Tuanjuntai Concentrator has reached more than 66%. The success of this process at the Tuanjuntai Concentrator has laid the foundation for the advancement of high-quality iron concentrate ore dressing technology in China. Subsequently, the Flotation Workshop of Qishanshan Concentrator of Anshan Iron and Steel Co., Ltd. was changed from acid positive flotation process to this process in 2001, and the original roasting-magnetic separation workshop was also transformed into the same process as the flotation plant in early 2002. Currently iron concentrate The grade has reached more than 67%. At the same time, the Maanshan Mine Research Institute has also achieved good test results for the use of this process in magnetite concentrates. For example, the iron concentrate of Taishan Jianshan Iron Mine can be increased from 65% to over 68.5%, and SiO ₂ from 8 % is reduced to below 4%, and the operating yield is over 98%; the iron concentrate of Laigang Hanwang Iron Mine can be increased from 63% to more than 67%, and the SiO ₂ content is reduced from 11% to less than 6%. The rate of 97%, the reverse flotation plant of the above two mines was completed and put into operation at the end of 2002. Subsequently, the anionic collector floating silicon process has been widely applied in concentrating plants such as Anshan-type lean iron ore, such as the Anshan Iron and Steel Mine in Anshan Iron and Steel and the Sijiaying Iron Mine in Tangshan Iron and Steel.

China is the first country in the world to promote the use of anion reverse flotation silicon removal process. It is suitable for the treatment of coarse concentrates. The commonly used processes are one rough selection, one selection, three sweeps, and medium mines. China's research and practice have proved that the use of Ca++ to selectively activate siliceous minerals and selectively inhibit iron minerals in strong alkaline media makes the difference in floatability between iron minerals and siliceous minerals larger. The flotation selectivity makes it possible to obtain both high-quality iron concentrates and low-grade tailings, and has good adaptability to changes in the properties of human floating materials, especially for iron-containing silicates. The sorting of materials with more minerals is obviously superior to the cationic collector floating silicon process. The shortcomings are that there are many varieties of chemicals, and the cost is slightly higher. Because the higher pH of the pulp has an effect on the filtration of the concentrate (can be solved by acid neutralization).

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