Method for recovering silicon and iron from iron tailings

Abstract

The invention provides a method for recovering silicon and iron from iron tailings, and the iron tailings comprise silicon and iron. The recovery method comprises the following steps: carrying out pre-grading, first-stage ore grinding, primary grading, second-stage ore grinding grading operation, third-stage ore grinding grading operation, first-stage weak magnetic operation, first-stage strong magnetic operation, second-stage weak magnetic operation, second-stage strong magnetic operation, third-stage weak magnetic operation, third-stage strong magnetic operation, fourth-stage strong magnetic operation, roughing spiral chute and concentration spiral chute on the iron tailings; flotation concentrate, a high-purity silicon dioxide micro powder product and a coarse-grain silicon dioxide product are obtained through a scavenging spiral chute, a coarse-grain flotation operation device, a coarse-grain leaching device, an iron extraction flotation operation device, a fine-grain flotation operation device and a fine-grain leaching device. According to the method, high-added-value recycling of the iron tailings can be achieved, the coarse-grain silicon dioxide product, the iron ore concentrate and the high-purity silicon dioxide micro powder product are recycled according to market requirements, efficient development and utilization of resources are fully achieved, and the method has important practical significance and strategic significance.

Description

technical field [0001] The invention relates to the technical field of materials recovered from iron tailings, in particular to a method for recovering silicon and iron from iron tailings. Background technique [0002] The main components in iron tailings in Anshan area are silicon and iron. The existing technology for extracting silicon and iron from iron tailings generally only considers the purity of silicon dioxide (purity below 99.7%), and does not consider the purity of silicon dioxide. Particle size, the obtained silica product is mixed with coarse-grained and fine-grained grades, and a wide particle size grade is not conducive to the subsequent utilization of high added value. Such as patent a kind of method (CN108636591A) that reclaims quartz from iron tailings, only considered the purity, but did not consider particle size; Such as patented a kind of iron tailings preparation high-purity silicon dioxide system (CN208308443A) obtains purity lower than 99.7% such as...

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Problems solved by technology

[0002] The main components in iron tailings in Anshan area are silicon and iron. The existing technology for extracting silicon and iron from iron tailings generally only considers the purity of silicon dioxide (purity below 99.7%), and does not consider the purity of silicon dioxide. Particle size, the obtained silica product is mixed with coarse-grained and fine-grained grades, and the wide particle size grade is not conducive to the subsequent utilization of high added value

Such as patent a kind of method (CN108636591A) that reclaims quartz from iron tailings, only considered the purity, but did not consider particle size; Such as patented a kind of iron tailings preparation high-purity silicon dioxide system (CN208308443A) obtains purity lower than 99.7% such as a method for recovering quartz in iron tailings in the patent and the purity of silica obtained in the quartz ore (CN104190533 A) prepared by this method is lower than 99.7%, and the purity of the above-mentioned patents is lower than 99.7% % without considering the particle size of silica

The silica products demanded by the market are mainly coarse-grained silica (silica purity≧99%, particle size≧44) and high-purity silica powder (silicon dioxide purity≧99.9%, particle size≤10). The market demand for high-purity silica powder (silicon dioxide purity above 99.9%, particle size below 10 microns) is increasing year by year, especially in the field of chip manufacturing, but the current recycling technology can only obtain the highest purity of 99.7%. Silica, unable to better meet the needs of the market

[0003] The existing technology for recovering silicon and iron from iron tailings has a low recovery rate of silicon and high production costs. For example, a patented system for preparing high-purity silica from iron tailings (CN208308443) has a silicon recovery rate of only 20%.

Such as a patented method for recovering quartz from iron tailings (CN108636591A), the iron tailings are subjected to strong magnetic roughing to obtain iron rough concentrate and quartz rough concentrate, and the quartz rough concentrate is classified, ore ground, floated Quartz products with a grade greater than 99.7% can be obtained through separation, roughing and multiple sweeping, strong magnetic separation, and leaching. Iron coarse concentrate is used to extract iron concentrate, which grinds all particle sizes, which increases the cost of grinding

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