A high-efficiency and low-consumption ultra-fine crushing-grinding process

An ultra-fine crushing and process technology, which is applied in agricultural machinery and equipment, grain processing, energy saving measures, etc., can solve the problems of reducing concentrate grade and recovery rate, increasing power consumption and steel consumption, and increasing beneficiation cost, so as to reduce the beneficiation cost. , the effect of reducing the amount of ore and improving the processing capacity

Inactive Publication Date: 2015-12-02
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the current high-pressure roller mill ultra-fine crushing-grinding process, there are the following defects. No matter whether the high-pressure roller mill adopts open-circuit crushing, edge material circulation closed-circuit crushing or full-closed circuit crushing, the dissociated products often appear "over-crushing" and The phenomenon of "mudification" and "over crushing" and "mudification" will not only deteriorate the mineral processing index, reduce the grade and recovery rate of the concentrate, but also increase the power consumption and steel consumption in the grinding process, significantly Increase the cost of beneficiation

Method used

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  • A high-efficiency and low-consumption ultra-fine crushing-grinding process
  • A high-efficiency and low-consumption ultra-fine crushing-grinding process

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Effect test

Embodiment 1

[0019] The crushed ore is an Anshan type lean hematite, with a water content of 3%, a TFe grade of 24.48%, SiO 2 The content is 65.08%. The content of harmful elements S and P is relatively small, and the high-pressure roller mill is used for full-closed ultra-fine crushing. The size of the sieve hole is controlled to 3.2mm, the roller surface pressure is 6MPa during work, the roller speed is 1.6m / min, and the roller gap is 30mm.

[0020] After the lean hematite is ultra-finely crushed by the high-pressure roller mill, it first enters the high-frequency vibrating screen for classification. The graded products with a particle size of +1.0mm directly enter the first stage of grinding, and the classified products with a particle size of -1.0mm enter the hydrocyclone. Classification is carried out by hydrocyclones, and the graded products with a particle size of +0.5mm enter the first stage of grinding after hydrocyclone classification. After hydrocyclone classification -0.5mm pa...

Embodiment 2

[0030] The crushed ore is a molybdenum ore, the ore molybdenum grade is 0.097%, and the molybdenum oxidation rate is 3.4%. The metal minerals are mainly pyrite, molybdenite, chalcopyrite, etc. The gangue minerals are mainly quartz, biotite and feldspar. The high-pressure roller mill performs full-closed ultra-fine crushing, the size of the control screen hole is 3.2mm, the pressure of the roller surface is 5MPa during operation, the roller speed is 1.8m / min, and the roller gap is 25.5mm.

[0031] The molybdenum ore is subjected to full-closed ultra-fine crushing through a high-pressure roller mill. The ultra-fine crushed products first enter the high-frequency vibrating screen for classification, and the classified products with a particle size of +1.0mm directly enter the first stage of grinding, and the classified products with a particle size of -1.0mm are then Enter the hydrocyclone for classification. After classification by the hydrocyclone, the graded products with a par...

Embodiment 3

[0037]The crushed ore is a copper-molybdenum ore in Mongolia. The copper grade of the raw ore is 0.0739%, and the copper oxidation rate is 6.88%; the molybdenum grade is 0.0407%, and the molybdenum oxidation rate is 4.91%. Stone minerals are mainly quartz, potassium feldspar, plagioclase, mica, etc., using a high-pressure roller mill for full-closed ultra-fine crushing, controlling the size of the sieve hole to 3.2mm, the pressure on the roller surface during work is 4MPa, and the roller speed is 1.8m / min, the roll gap is 25mm.

[0038] The copper-molybdenum ore is subjected to full-closed ultra-fine crushing through a high-pressure roller mill. The ultra-fine crushed products first enter the high-frequency vibrating screen for classification, and the classified products with a particle size of +1.0mm directly enter the first stage of grinding, and the classified products with a particle size of -1.0mm Then enter the hydrocyclone for grading. After grading by the hydrocyclone...

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Abstract

The invention relates to an efficient low-consumption ultrafine crushing-ore grinding process. The process is characterized in that a high-pressure grinding roller mill is utilized for carrying out ultrafine crushing, wherein the particle sizes of products subjected to the ultrafine crushing are -3.2mm; the products are pre-graded, the pre-graded fine-fraction products directly enter a sorting step without needing a primary grinding step, the pre-graded coarse-fraction products enter the sorting step after being subjected to ore grinding in the primary grinding step. According to the process, by carrying out pre-grading, the over-crushing of the dissociated fine-fraction products in the primary grinding step is avoided, the quantity of ores entering the primary grinding step is remarkably reduced, the processing capability of an ore grinding system is improved, the sorting index of ore concentrate products is improved, and meanwhile, the energy consumption is saved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to an ultrafine crushing-grinding process with high efficiency and low consumption. Background technique [0002] About 5% of all energy consumption in the world is used for material crushing. High-pressure roller mill is a new type of ore crushing equipment designed based on the principle of material bed crushing. It has the characteristics of low energy consumption per unit of crushing, uniform particle size of crushed products, small footprint, and high equipment operating rate. The mainstream of the development of crushing and less grinding technology. The use of high-pressure roller mills for ore crushing can significantly reduce crushing-grinding energy consumption. In the traditional three-stage and one-closed circuit crushing process of the concentrator, if the third stage of crushing uses high-pressure roller mills instead of cone crushers, crushing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B02C23/08
CPCY02P60/15
Inventor 刘磊曹进成冯安生谭琦郭珍旭岳铁兵吕良
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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