Calcination production line and calcination method for industrial by-product gypsum

Abstract

The invention discloses a calcination production line and a calcination method for industrial by-product gypsum. The calcination production line comprises a feeding mechanism, a metering mechanism, an inclined conveyer belt, a scattering mechanism, a drying pipeline, a gas-solid separation tower, a negative pressure fan, a screw feeder, a horizontal-type rotational calcining kiln, a burning furnace, a finished-product conveying mechanism, a material storage tower, a temperature measurement display system and a PLC (Programmable Logic Controller) control system, wherein the drying pipeline is arranged vertically, the middle lower part of the drying pipeline is connected to a discharge port of the scattering mechanism, the upper end of the drying pipeline is connected to a gas inlet of the gas-solid separation tower, a gas outlet of the gas-solid separation tower is connected to a gas inlet of the negative pressure fan, a discharge port of the gas-solid separation tower is connected to the screw feeder, a discharge port of the screw feeder is arranged in the rotational calcining kiln, the burning furnace comprises a primary burning furnace and an auxiliary burning furnace, and multiple U-shaped heat exchange pipes are fixed in the rotational calcining kiln. The calcination method comprises the following steps of: charging, metering, scattering, drying, gas-solid separating, calcining, discharging, finished-product conveying, storing and cooling; and the calcination production line has the advantages of high automation degree, stable finished-product quality and lower energy consumption.

Description

technical field [0001] The invention relates to gypsum calcination equipment, in particular to a calcination production line for industrial by-product gypsum, and also relates to a method for using the above-mentioned calcination production line to calcine industrial by-product gypsum. Background technique [0002] In my country, the main industrial by-product gypsum is desulfurization gypsum and phosphogypsum. In 2010, my country’s annual industrial by-product gypsum reached 137 million tons, but the actual comprehensive utilization rate was only 40%. Rates are above 90%. At present, the main reason for the low utilization rate of industrial by-product gypsum in my country is that the gypsum calcination technology is immature, and the by-product gypsum can only be used as a cement retarder. Moreover, the product quality is uneven, and the backwardness of calcination technology has seriously affected the comprehensive utilization of industrial by-product gypsum, restricting t...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the large fluctuations in the moisture content of the by-product gypsum, ordinary calcination equipment cannot adjust parameters in time, resulting in unstable quality of the calcined finished product;

[0005] 2. The utilization of waste heat is not fully considered, and the production energy consumption is high;

[0006] 3. The degree of automation of the equipment is low, the production efficiency is low, the calcination cost of the product is high and the quality fluctuates greatly;

[0007] 4. The dust in production is not treated, which has a great impact on the surrounding environment

Images