Method and apparatus for calcining mineral materials difficult to be treated

Abstract

The invention opened a roasting method of the intractable mineral. The mineral is put into the roasting pipe of the roasting furnace to roast for 1.0-5.0h, and then heated by the coal, the gas or the residual heat. The temperature of the pipe is 400-1150 DEG C. It mixes the mineral by turning the pipe continuously or intermittently. The roasting furnace includes the dispenser, the petticoat pipe collector, the flue, the rectangular parallelepiped furnace body, bag-type dust collector, the eluting gas wash tower, the receiver bin, the fueling equipment, the fuel discharge device and the draught fan. The ratio of the long to the diameter of the roasting pipe is 2-15:1. the method has the low cost and high production.

Description

1. Technical field [0001] The invention relates to a mineral material dressing and smelting method and equipment, in particular to a mineral material roasting method and equipment. 2. Background technology [0002] With the decrease of mineral resources, the decline of primary ore grade and the continuous enhancement of people's awareness of environmental protection, the development and utilization of refractory ores and the comprehensive recovery of valuable metals from beneficiation and metallurgical production by-products and refractory accumulated materials have been paid more and more attention. . At present, the method of recovering metals and useful minerals in refractory ores and refractory materials mostly adopts the method of roasting first and then smelting. The existing roasting methods generally use the method of direct contact between mineral materials and fuels. The main equipment includes multi-hearth furnaces and fluidized fluidized furnaces. , circulating ...

AI Technical Summary

Problems solved by technology

At present, the method of recovering metals and useful minerals in refractory ores and refractory materials mostly adopts the method of roasting first and then smelting. The existing roasting methods generally use the method of direct contact between mineral materials and fuels. The main equipment includes multi-hearth furnaces and fluidized fluidized furnaces. , circulating fluidized fluidized furnace, flash roasting furnace, etc., due to the short residence time of the material in the roasting process, the removal of impurities is not complete, which affects the subsequent smelting process, and if the residence time in the furnace is prolonged to make the roasting continue, it is necessary to add special Fuel heat preservation and combustion support greatly increase the production cost, so it is difficult to be used for low-sulfur, high-carbon minerals, high-arsenic, high-antimony, high-carbon minerals, and carbon slag, sulfur slag, smelting slag and other minerals produced during the refining process Roasting of materials; although the rotary kiln can fix sulfur and arsenic when roasting refractory ore and carbon slag, sulfur slag, smelting slag and other mineral materials produced in the refining process, it can remove sulfur, arsenic, antimony, carbon and other impurities, However, the production capacity per unit volume of the equipment is low. Due to the mixture of fuel and materials, the amount of smoke and gas is large, and the effect of dust collection and waste gas treatment is poor. There are defects of high production cost and large pollution.

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