Upgrading and silicon-reduction direct flotation method for silicate type hematite and limonite rough flotation concentrate

Abstract

The invention discloses an upgrading and silicon-reduction direct flotation method for silicate type hematite and limonite rough flotation concentrate. The method comprises the steps of conducting rough flotation, wherein water is added to the silicate type hematite and limonite rough flotation concentrate, so that pulp is obtained, the pulp is put into rough flotation equipment, a collecting agent, an inhibiting agent, an auxiliary collecting agent, a PH adjusting agent and H2SO4 with the concentration being 5% are sequentially added, and stirring for direct flotation is conducted, so that rough flotation concentrate foam and rough flotation tailings are obtained; conducting cleaner floatation, wherein the rough flotation concentrate foam is put into cleaner flotation equipment, an inhibiting agent is added, and stirring for direct flotation is conducted, so that cleaner flotation concentrate and cleaner floatation tailings are obtained; and conducting scavenging, wherein the cleaner floatation tailings are put into scavenging equipment, a collecting agent and / or an inhibiting agent, an auxiliary collecting agent, a PH adjusting agent and H2SO4 with the concentration being 5% are added, and stirring for scavenging is conducted, so that scavenging concentrate and scavenging tailings are obtained. The upgrading and silicon-reduction direct flotation method has the beneficial effects of being mature in process, stable in indicator, easy to operate, obvious in upgrading and silicon reduction effect and high in yield and recovery rate.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, and specifically relates to the extraction of silicate-type red limonite roughing concentrate with mature technology, stable index, simple operation, obvious effect of quality improvement and silicon reduction, and high yield and recovery rate. Quality reduced silicon positive flotation method. Background technique [0002] The Dahongshan Iron Mine is the most advanced underground mining iron mine with the largest scale in my country. The Dahongshan Iron Mine, which accounts for about 18% of my country's iron ore resources, is a typical representative of volcanic rock-type deposits. The ratio is large, the content of silicate and iron silicate minerals is high, the content of fine particles is high, the content of silicon in iron concentrate is high, and the content of iron in tailings is high. In particular, it has the unique "234" physical properties and other characteristic...

AI Technical Summary

Problems solved by technology

For fine-grained and weakly magnetic hematite, hematite and magnetite-hematite mixed ore, the gravity separation process was generally used in the early stage. Due to its small beneficiation capacity, low beneficiation grade and low yield, it was gradually adopted. Elimination; Later, flotation process and strong magnetic separation process were developed, but the technical indicators for the separation of weakly magnetic hematite did not achieve satisfactory results; mining and selection of low-grade, fine-grained hematite And red limonite, in order to achieve the purpose of saving energy, reducing consumption and improving the quality of concentrate, the grinding and separation process generally adopts the principle of multi-stage grinding and stage separation. If it is necessary to further improve the quality of magnetic separation concentrate , can use weak magnetic separation - reverse flotation combined process

However, for red limonite with finer particle size, it needs multi-stage grinding to dissociate the gangue as much as possible, which not only consumes a lot of energy and investment, but also The beneficiation efficiency and recovery rate are low, the cost is high, and it is difficult to realize the economic separation of silicate hematite

In order to reduce costs and improve beneficiation efficiency, only to reduce grinding, but lead to SiO 2 It mainly exists in coarse-grained ore, and because of the high content of silicate minerals in this part of coarse-grained ore, it is difficult to obtain better results by reverse flotation, so it is currently a difficult problem in the beneficiation of silicate-type hematite where the

For the beneficiation of red limonite, roasting-magnetic separation was mainly used in China. Due to poor production technical indicators, the roasting-magnetic separation process was gradually discontinued as early as the 1990s due to high costs; for magnetic iron ore , there is also a strong magnetic separation-positive flotation combined process for beneficiation to avoid the disadvantage of poor strong magnetic selectivity, but there is also the problem that the iron grade of the flotation tailings is too high, resulting in a low recovery rate of iron concentrate

Up to now, although there have been many technologies that can promote the beneficiation effect of hematite ore, the beneficiation process involving ultra-fine silicate hematite is still a big problem

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