Carbide slag drying method for vertical mill

Abstract

The invention discloses a method of using a vertical mill for drying calcium carbide. Wet-discharged calcium carbide slag with a pre-drying water content of 12 percent and 18 percent is used as a raw material and is mixed with auxiliary raw materials, such as sandstone, sulfate slag and the like after calculation to be sent into a vertical mill. After entering the vertical mill and being rolled by mill rollers, the materials are rolled and splashed to the part of an air ring on the edge of a millstone and is carried up by the currents of the air ring of kiln tail waste gas, and the air ring has a high speed of 70 mm to 90 mm per second. Wet materials and the kiln tail waste gas have heat exchange, the powdery material after the heat exchange rises together with the currents to pass through the upper shell of the mill to enter the stage separation area of a separator, wherein the coarse powder falls back to the millstone and is milled again with the new-fed material, and the qualified fine powder after stage separation is together discharged out from the vertical mill with the currents to be collected as a finished product by a collector. The method provided by the invention can integrate the homogenization, the drying, the milling and the stage separation of the material into a whole, reinforces the homogenizing and drying functions, solves the problems that the calcium carbide has a high water content and fine granularity and can not be easily dried and milled, and has simple and compact technical procedures, high heat efficiency and low electric consumption.

Description

technical field [0001] The invention relates to a method for drying carbide slag by a vertical mill. Background technique [0002] The invention patent with the patent number CN200410072311.5 provides a method for drying calcium carbide, in which the calcium carbide slag after the initial dehydration is sent to the pulverizer through the raw material conveyor belt for crushing, and the crushed calcium carbide slag is sent to the raw material hoist; Dry in the drying equipment, generally control the moisture content of 0.1 to 10% and put it into storage for use. This method has the following disadvantages: (1), the whole process is complicated, there are many equipments, the failure rate is high, and the operating rate is low; (2), the use of a drying furnace is easy to stick and block, the thermal efficiency is low, and the output is low; (3), after The calcium carbide slag after the initial dehydration is sent to the pulverizer through the raw material conveyor belt for cr...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for drying calcium carbide slag by vertical grinding in the dry cement production process, which integrates the uniformity, drying, grinding and grading of materials, strengthens the functions of uniformity and drying, and solves the problem of Carbide slag has high water content, fine particle size, and is not easy to dry and grind

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