Preparation method of zinc oxidizing pressure leaching raw material and two-section vertical stirring grinder series-connection open-circuit ore grinding system

Abstract

The invention discloses a preparation method of a zinc oxidizing pressure leaching raw material and a two-section vertical stirring grinder series-connection open-circuit ore grinding system. The method comprises the steps that a to-be-ground zinc concentrate material is firstly pulpified to obtain ore pulp with a certain concentration; the ore pulp obtained after pulpifying enters a primary-section vertical stirring grinder to be roughly ground; a material with the high ore grinding fineness and with the ore pulp concentration keeping unchanged is obtained after rough grinding; the material obtained after rough grinding enters a secondary-section vertical stirring grinder again to be finely ground; and a material with the higher ore grinding fineness and with the ore pulp concentration keeping unchanged is obtained after fine grinding, that is, the stable zinc oxidizing pressure leaching raw material is obtained. The system comprises a pulpifying device, the primary-section vertical stirring grinder and the secondary-section vertical stirring grinder. An output opening of the pulpifying device is connected with a feeding opening of the primary-section vertical stirring grinder, and a discharging opening of the primary-section vertical stirring grinder is connected with a feeding opening of the secondary-section vertical stirring grinder. The method and the system have the beneficial effects of being low in investment, low in cost, short in process, low in operating cost, stable and reliable in work and good in fine grinding effect.

Description

technical field [0001] The invention relates to the field of non-ferrous metallurgy technology and grinding equipment, in particular to a method for preparing raw materials for zinc-oxygen pressure leaching and a two-stage vertical stirring mill connected in series open circuit grinding system. Background technique [0002] The traditional zinc oxygen pressure leaching raw material preparation method is to adopt the ball mill grinding process, such as image 3 As shown, the grinding system used in the ball grinding process is composed of a traditional ball mill, a classifier and a thickener. It is a closed-circuit grinding system. The particle size of the zinc concentrate can reach D95=45µm through ball mill and classifier grinding. The thickener concentrates the solid content of the pulp overflowed from the cyclone from 30% to 40% to 65% to 70%. The disadvantages of this closed-circuit grinding system are: the product particle size is unstable; ball milling efficiency is low...

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Problems solved by technology

[0002] The traditional zinc oxygen pressure leaching raw material preparation method is to adopt the ball mill grinding process, such as image 3 As shown, the grinding system used in the ball grinding process is composed of a traditional ball mill, a classifier and a thickener. It is a closed-circuit grinding system. The particle size of the zinc concentrate can reach D95=45µm through ball mill and classifier grinding. The thickener concentrates the solid content of the pulp overflowed from the cyclone from 30% to 40% to 65% to 70%. The disadvantages of this closed-circuit grinding system are: the product particle size is unstable; ball milling efficiency is low, energy consumption is large, and the process is long ;Large area; High investment cost; Difficult management; Unstable bottom flow of thickener and high system operating cost

[0003] At present, sand mills are used to prepare zinc-oxygen pressure leaching raw materials, but sand mills are expensive; the service life of their wearing parts (such as grinding discs and cylinders) is short; the consumption of grinding media is large and the price is expensive ;The installed power of the motor is large; the operating cost is high; the cylinder volume is small and the grinding effect is poor, and the product particle size only reaches D85=45µm, which affects the subsequent leaching operation indicators

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