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- Production Line
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INTRODUCTION:
With the iron raw material market competition more and more intense, people pay more attention to hematite. Moreover, pharmaceutical processing, development of mineral processing technology and equipment, making hematite beneficiation process has also been improved. Hematite beneficiation methods from the original re-election becomes magnetic separation, flotation, and then improved to a joint process.
Mainly hematite beneficiation methods include gravity separation and flotation or re-election - flotation beneficiation method. Gravity separation is the use of spiral chute shaker and enrichment of ore, smelting in order to achieve the desired taste. Hematite flotation generally use reverse flotation, the hematite gangue as a collector was to obtain high-grade hematite powder. The advantage is that the agent is simple, low cost; but its drawback is only suitable for treating relatively simple structure of gangue ore, concentrate sometimes also require multiple selection to get qualified concentrate powder, foam concentrate and sticky and difficult to concentrate filtration, resulting concentrate contained higher moisture. When using fatty acids flotation collector iron ore, pulp temperature because they have a significant impact, in order to improve the flotation can be improved pulp temperature before flotation, its benefits are greatly selective agent improved selection when coupled without fatty acid, after regrinding do not need to take off the mud.
Here we briefly describe two common anti-flotation process.
One, Anionic collector reverse flotation
For the gangue of quartz-based mineral with a calcium-activated quartz, followed by fatty acids collector anti-flotation foam product thus obtained quartz, and stay in the groove product is iron ore. When iron ore reverse flotation inhibitors available starch (tapioca starch, acorn starch), sulfonated lignin and dextrin. With sodium hydroxide or sodium hydroxide mixed with sodium carbonate, to adjust the slurry pH to 11 or more. Quartz Only after activation of polyvalent metal cations to collector with fatty acids. Common ion activation is Ca2 +, with most of the calcium salt is calcium chloride, followed by calcium hydroxide. Must be noted that this method is suitable for high-grade iron and gangue and ore flotation easier to float, but the application of the Act to pay attention to water treatment or recycling of tailings, the tailings water because the pH value up to 11, if the direct emissions, would seriously polluted water bodies.
Two, Cationic collector reverse flotation
Flotation reagents used are amines collector, use it to flotation gangue of quartz, amine collector agent ether amine is best, followed by fatty amines. Iron inhibitor using water glass, tannin and sulfonated lignin at a pH of 8-9, the best inhibitory effect. Also various types of starch can also be used to inhibit iron minerals. The advantage is :
1. Need for finely ground ore hematite selected anionic collector flotation iron when, and as long as the cation reverse flotation ore ground to monomer dissociation, amine collector can be a good way to quartz veins stone float.
2. High recovery rate, especially when the iron ore containing magnetite, with anionic collector flotation magnetite is easily lost in the tailings, and when cationic reverse flotation, magnetite can be be recovered.
3. May improve the quality of concentrate: anionic flotation, will be poured into the iron-containing silicate foam cation reverse flotation of iron silicate and quartz together into the tailings, so the higher concentrate products.
4. To simplify the job, cationic reverse flotation can be removed from the mud off the job, it can also reduce the loss of iron minerals. Containing iron ore flotation This method is suitable for high-grade iron, and more complex components.