Method for microwave drying of sodium chloride

Abstract

The invention relates to a method for microwave drying of sodium chloride, which comprises the following steps: using the sodium chloride of which the water content is between 0.8 and 4 weight percent as a raw material; adopting a continuous microwave drying device; according to relatively fixed microwave power, changing the ventilation volumes of different microwave cavities, further adjusting parameters such as the transporting rate of materials in the microwave cavities, the thickness of the material and the like; and mounting a stirrer and cavity clapboards in the microwave drying device. The ventilation volumes of ventilation devices in the microwave cavities are controlled to be between 1,247 and 2,250 m<3> / h, the speed rate of a conveying belt is between 0.5 and 2 meters per minute, the thickness of material layers is controlled to be between 1 and 5 centimeters, the stirrer and the cavity clapboards are arranged on the microwave drying device, a roll-type breaking plant is arranged in front of a discharge port, and the particle size of the sodium chloride is controlled to be less than 3 millimeters, thus the method achieves the effect that the mass water content of high-titanium slag is dried to be less than 0.5 percent from 0.8 to 4 percent at drying temperature of between 65 and 70 DEG C.

Description

1. Technical field [0001] The invention relates to a microwave drying method for sodium chloride, which belongs to the technical field of microwave heating applications. 2. Background technology [0002] Almost all industrial fields have thermal drying, involving tens of thousands of materials. Material drying is a high-energy-consuming industry. According to incomplete statistics, 10-25% of the world's energy is used for industrial thermal drying. In my country, the energy used for drying accounts for about 12% of the total energy consumption of the national economy. On the other hand, the drying industry generally has low thermal efficiency. At the same time, the pollution generated during the drying process is also the main source of environmental pollution in my country, especially the steam drying workshop. The harmful substances produced: smoke, CO 2 , SO 2 and a small amount of NO 2 , These substances are the main factors that cause the atmospheric greenhouse effec...

AI Technical Summary

Problems solved by technology

These drying methods are to send hot dry air or steam into the drying chamber, absorb the moisture of the material to be dried and discharge it directly into the atmosphere. The main disadvantages are: (1) low energy utilization efficiency

Because the discharged hot and humid air contains a large amount of sensible heat and latent heat, the energy utilization efficiency of conventional drying equipment is generally very low, and the highest is only about 35%; (2) The drying cycle is long

The heating method of the conventional drying process is external heating, the heat can only be transferred from the outside to the inside, the heating is slow, and the drying time is long; (3) the product uniformity is poor; (4) the drying equipment technology is backward, maintenance is difficult, and some processes are easy to cause material damage Loss and decline in quality not only increase production costs, reduce recovery rates, but also pollute the environment

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