Process for dry type ore grinding employing vertical roller mill

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 ...

Images