Three-stage, one-closed-circuit, two-stage pre-selection crushing new process

Abstract

The invention relates to a new three-stage, one-closed-circuit, two-stage pre-selection crushing process. The steps are as follows: Send the raw ore to a coarse crusher for crushing, and its discharge enters a section of vibrating screen for classification, and the products on the screen enter a section of magnetic pulley, and a section of magnetic pulley for separation The output concentrate enters the intermediate crusher for crushing, and the sorted waste rock enters the waste rock bin. The product of the intermediate crusher enters the second-stage vibrating screen together with the under-screen product of the first-stage vibrating screen, and the over-screen product of the second-stage vibrating screen enters the second-stage vibrating screen. The second-stage magnetic pulley, the waste rock separated by the second-stage magnetic pulley enters the waste rock bin, the concentrate separated by the second-stage magnetic pulley enters the fine crusher for crushing, and the crushed product of the fine crusher and the product of the intermediate crusher are combined into the The second-stage vibrating screen is classified, and the under-screen product of the second-stage vibrating screen enters the dry magnetic separator, and the concentrate of the dry magnetic separator is sent to the final product for grinding, and the separated waste rock enters the waste rock bin. By adopting the new process of the present invention, waste rocks can be removed to the greatest extent before grinding, the amount of ore input can be reduced, and the purpose of saving energy and reducing consumption can be achieved.

Description

Technical field [0001] The invention relates to the technical field of beneficiation pre-selection and crushing, in particular to a new three-stage, one-closed circuit and two-stage pre-selection and crushing process. Background technique [0002] In recent years, as mines have been exploited in depth, mining conditions for ore bodies have gradually deteriorated, rock interlayers have increased, and ore output grades have declined. Because a large amount of rock is mixed into the ore, the process of crushing, sorting, and tailing has caused the increase in the cost of beneficiation, and the rock is easy to silt during the grinding process, which restricts the improvement of the iron concentrate grade. Abandoning low-grade and large-mixed ores will result in low recovery rate, high stripping ratio, increased cost, waste of resources, and the ore supply capacity cannot meet the demand for ore from the concentrator. Use it. In the process of utilization, "consumption reduction" is...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the dry magnetic pulley is that the fine particles mixed in the coarse particles cannot be separated

This kind of crushing process still cannot meet the grinding and selection grade for magnetic ore with relatively low raw ore grade.

As a result, the qualified gangue in the crushed ore will enter the grinding process, which will increase the cost of beneficiation

Images