Process for dry type ore grinding employing vertical roller mill

A vertical roller mill and vertical roller mill technology, which is applied in the raw ore boiling roasting process, can solve the problems of complex process, large investment in equipment, site, environmental protection, etc., and uneven combustion of pulverized coal, so as to increase the specific surface area , save space and investment, improve the effect of leaching rate

Active Publication Date: 2007-12-12
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a dry grinding process using a vertical roller mill, which solves the problems of complicated flow in the current grinding process and large investment in infrastructure such as equipment, sites, and environmental protection; During the grinding process, the lump coal and the ore are dry-ground together, which effectively solves the problem of uneven combustion of coal powder during the roasting process

Method used

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  • Process for dry type ore grinding employing vertical roller mill

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Effect test

Embodiment 1

[0021] As shown in accompanying drawing 1, processing step of the present invention is as follows:

[0022] Step 1: Crushing

[0023] The ore extracted from the underground is crushed to a particle size of -70mm after a stage of coarse crushing and a stage of intermediate crushing. The lump coal 3 and the crushed ore 2 are fed into the high-pressure vertical roller mill through the belt conveyor 1 under automatic measurement and control conditions. Carry out dry grinding in machine 4;

[0024] Step 2: Dry Grinding

[0025] The crushed ore 2 and coal block 3 entering the high-pressure vertical roller mill 4 are firstly supplied with hot air 9 by a circulating induced draft fan 6, and the hot air 9 enters the air mixing chamber 8 and is formed by a fuel burner to form a hot air temperature of 250°C for direct drying Ore 2 and coal block 3, the circulating air volume of the circulating induced draft fan 6 is 135000m 3 / h; vertical roller mill 4 air inlet negative pressure -400...

Embodiment 2

[0029] As shown in accompanying drawing 1, processing step of the present invention is as follows:

[0030] Step 1: Crushing

[0031] The ore extracted from the underground is crushed to a particle size of -70mm after a stage of coarse crushing and a stage of intermediate crushing. The lump coal 3 and the crushed ore 2 are fed into the high-pressure vertical roller mill through the belt conveyor 1 under automatic measurement and control conditions. Carry out dry grinding in machine 4;

[0032] Step 2: Dry Grinding

[0033] The crushed ore 2 and coal block 3 entering the high-pressure vertical roller mill 4 are firstly supplied with hot air 9 by a circulating induced draft fan 6, and the hot air 9 enters the air mixing chamber 8 and is formed by a fuel burner to form a hot air temperature of 250°C for direct drying Ore 2 and coal block 3, the circulating air volume of the circulating induced draft fan 6 is 153000m 3 / h; vertical roller mill 4 air inlet negative pressure -450...

Embodiment 3

[0037] As shown in accompanying drawing 1, processing step of the present invention is as follows:

[0038] Step 1: Crushing

[0039] The ore extracted from the underground is crushed to a particle size of -70mm after a stage of coarse crushing and a stage of intermediate crushing. The lump coal 3 and the crushed ore 2 are fed into the high-pressure vertical roller mill through the belt conveyor 1 under the condition of automatic measurement and control. Carry out dry grinding in machine 4;

[0040] Step 2: Dry Grinding

[0041]The crushed ore 2 and coal block 3 entering the high-pressure vertical roller mill 4 are firstly supplied with hot air 9 by a circulating induced draft fan 6, and the hot air 9 enters the air mixing chamber 8 and is formed by a fuel burner to form a hot air temperature of 250°C for direct drying Ore 2 and coal block 3, the circulating air volume of the circulating induced draft fan 6 is 162000m 3 / h; vertical roller mill 4 air inlet negative pressure...

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Abstract

The invention relates to a process of drying-grinding by using vertical roller mill, belonging to fluidizing roasting technique. It comprises following steps: coarse crushing, middle crushing coal and ore exploited from well, conveying crushed coal and ore to high-pressure vertical grinding roller through belt conveyer for drying grinding; the high-pressure vertical grinding roller drying coal and ore by using hot wind got from cyclic induced draft fan, the water content of dried ore is less than 2%; dried grinding coal and core in vertical grinding roller, classifying grinded material, discharging qualified material, feeding it into cyclone dust collector; returning unqualified material into roller for grinding; discharging cyanide leached hot calcine from discharge port of boiling calcining furnace. The invention is characterized by simplified process, saved area and investment, good coal distribution, homogenous burning, good baking effect in equilibrium temperature furnace, increased leaching ratio for goal materials and adequate utilization of excess heat resources.

Description

technical field [0001] The invention relates to a raw ore boiling roasting process, in particular to a dry grinding process using a vertical roller mill. Background technique [0002] As we all know, with the development of the gold industry, the proportion of refractory gold ore resources is increasing. For Carlin type refractory gold ore, the more suitable pretreatment process is raw ore boiling roasting, which can effectively solve the problem of fine sulfide The problem of encapsulating gold in particles can also be eliminated, and at the same time, the gold-robbing property of carbonaceous materials can be eliminated; one of the more important processes in the raw ore roasting pretreatment process is the preparation of roasted materials, which must be dried and ground. , the dry grinding process is essential and very important; at present, autogenous mills, ball mills or autogenous mills and ball mills are commonly used in foreign countries for grinding, such as Carlin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/14C22B11/08
Inventor 张清波汪丹鲁玉春谷志君
Owner CHANGCHUN GOLD RES INST
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