CN102538404A - Microwave drying method for wet monohydrate zinc sulfate product - Google Patents

Abstract

The invention relates to a microwave drying method for a wet monohydrate zinc sulfate product. The microwave drying method comprises the following steps of: (1) tiling the wet monohydrate zinc sulfate product on a heating disc or heating band of a microwave drying oven with the input power of 30-50 kw, wherein the thickness of the wet material is controlled at 20-40 mm; and (2) starting up a power source, and controlling the drying temperature at 100-150 DEG C, wherein the drying time is 8-15 min. Compared with the traditional air flow drying method which takes fuel coal as a heat source, according to the microwave drying method, the time for drying per ton of dry product is shortened to 8-15 min from 30-45 min in the prior art, the energy consumption for per ton of dry product is lowered to be only no more than 100 kwh of power consumption from the power consumption of 70-75 kwh and the coal consumption of 60-70 kg in the prior art, no environmental pollution is caused, and no dust raises and no smoke and no dust re generated by the coal firing is during drying, so that the clean production is achieved.

Description

A kind of method for microwave drying of wet sulfuric acid monohydrate zinc product

Technical field

The present invention relates to a kind of drying means when producing the sulfuric acid monohydrate zinc product.

Background technology

At present, the drying means of the domestic production sulfuric acid monohydrate zinc product overwhelming majority adopts fire coal to do thermal source.Do thermal source with fire coal three weak points are arranged: (1) energy consumption is big: the energy consumption index that fire coal is done the air-flow drying method oven dry monohydrate zinc sulphate of thermal source is: power consumption 70-75kwh/ ton dry product, coal consumption 60-70kg/ ton dry product; (2) the heat energy utilization rate is not high, and the hot air temperature that generally gets into drying equipment is: 250-450 ℃, the temperature of hot-air is 80-150 ℃ when leaving drying plant, causes a large amount of heat energy not make full use of; (3) produce a large amount of flue gas, dust in the coal-fired process, cause environmental pollution serious, must increase exhaust treatment system in addition, increased production cost like this, and some small-sized manufacturers are extremely serious to the pollution of environment according to without exhaust treatment system; (4) to use powerful air blast or air exhauster in the dry run, both produce noise, increase power consumption and production cost again.Also have manufacturer to heat with resistance wire, energy consumption is also very big, and its power consumption is a 310-350kwh/ ton dry product.

Summary of the invention

The objective of the invention is to overcome the shortcoming of prior art, a kind of method of utilizing the microwave drying monohydrate zinc sulphate is provided, realization can cut down the consumption of energy, shorten drying time, and is free from environmental pollution.

Technical scheme provided by the invention may further comprise the steps:

(1) getting wet sulfuric acid monohydrate zinc product is tiled on the heating plate or heating tape of microwave drier that input power is 30～50kw; Control wet feed thickness is 20～40mm;

(2) start power supply, the control baking temperature is 100～150 ℃; Be 8～15 minutes drying time.

The control of said drying time is to accomplish when material principal component Zn >=35.50% is promptly dry.

The present invention compares with the air-flow drying method that existing existing fire coal is done thermal source, and shorten to 8～15 minute by former 30～45 minutes/ton dry products its drying time; Energy consumption is that 70-75kwh/ ton dry product, coal consumption are that 60-70kg/ ton dry product is reduced to and has only power consumption≤100kwh/ ton dry product by former power consumption; And do not have environmental pollution: dry run is airborne dust not, does not also have coal-fired flue gas, the dust that produces, and realizes cleaner production.

The specific embodiment

Below in conjunction with embodiment the present invention is done further explain.

Embodiment 1:

Get wet zinc sulfate 105kg, put into the microwave drier that input power is 33.75kw, wet feed thickness 30mm, controlling drying time is 10 minutes, baking temperature is 150 ℃; Take out material after 10 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 100.5kg, and sample analysis Zn=35.61% is qualified, power consumption estimation 0.075kwh/kg dry product.

Embodiment 2:

Get wet zinc sulfate 110kg, put into the microwave drier that input power is 30kw, wet feed thickness 30mm, controlling drying time is 13 minutes, starts heating power supply and carries out drying, the temperature that records in the dry run is 140 ℃, takes out material after dry 13 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 104.9kg, and sample analysis Zn=35.82% is qualified, consumption estimation 0.083kwh/kg dry product.

Embodiment 3:

Wet zinc sulfate 110kg puts into the microwave drier that input power is 45kw, wet feed thickness 25mm, and controlling drying time is 8 minutes, starts heating power supply and carries out drying, the temperature that records in the dry run is 130 ℃, takes out material after dry 8 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 103.5kg, and sample analysis Zn=35.82% is qualified, consumption estimation 0.077kwh/kg dry product.

Embodiment 4:

Wet zinc sulfate 108kg puts into the microwave drier that input power is 45kw, wet feed thickness 25mm, and controlling drying time is 12 minutes, starts heating power supply and carries out drying, the temperature that records in the dry run is 100 ℃, takes out material after dry 12 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 102.0kg, and sample analysis Zn=35.82% is qualified, consumption estimation 0.098kwh/kg dry product.

Embodiment 5:

Get wet zinc sulfate 89kg, put into the microwave drier that input power is 45kw, wet feed thickness 20mm, controlling drying time is 8 minutes, starts heating power supply and carries out drying, the temperature that records in the dry run is 110 ℃, takes out material after dry 8 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 100.9kg, and sample analysis Zn=35.87% is qualified, consumption estimation 0.099kwh/kg dry product.

Embodiment 6:

Get wet zinc sulfate 105.6kg, put into the microwave drier that input power is 45kw, wet feed thickness 20mm, controlling drying time is 10 minutes, starts heating power supply and carries out drying, the temperature that records in the dry run is 120 ℃, takes out material after dry 10 minutes; Has no dust raising phenomenon in the dry run.Dry product heavily is 109.6kg, and sample analysis Zn=35.88% is qualified, consumption estimation 0.096kwh/kg dry product.

Claims (2)

1. the method for microwave drying of a wet sulfuric acid monohydrate zinc product is characterized in that, may further comprise the steps:

(1) getting wet sulfuric acid monohydrate zinc product is tiled on the heating plate or heating tape of microwave drier that input power is 30～50kw; Control wet feed thickness is 20～40mm;

(2) start power supply, the control baking temperature is 100～150 ℃; Be 8～15 minutes drying time.

2. the method for microwave drying of wet sulfuric acid monohydrate zinc product according to claim 1 is characterized in that, the control of said drying time is dry completion the when material becomes loose shape, its Zn of sample analysis >=35.50%.