Dehydration and drying method and device of metallurgical slurry with no pollution

Abstract

The invention provides a dehydration and drying method of metallurgical slurry with no pollution, which is characterized by comprising the following steps: conveying the metallurgical slurry into a sedimentation tank until the solid content is 5%-15%; then conveying to a concentration tank through the pipeline in an airtight manner and concentrating until the solid concentration is 20%-40%; pumping into a stirring pot for stirring and pumping into a dehydrator for dehydrating into sludge paste with the solid concentration being 75%-80%; pumping into a dryer and drying into sludge powder with the water content being less than or equal to 6%; and pneumatically conveying to a feed bin. The invention also provides a device for realizing the dehydration and drying method of metallurgical slurry with no pollution, and in the device, the sedimentation tank, the concentration tank, the stirring pot, the dehydrator, the dryer and the feed bin are connected by the pipeline in sequence; the slurry is conveyed to the concentration tank, the stirring pot, the dehydrator and the dryer in sequence from the sedimentation tank by taking a slurry pump as motive power, and the dried sludge powder is pneumatically conveyed to the feed bin. The invention can avoid the secondary pollution of the solid wastes, the dried sludge powder does not agglomerate and the granularity has good dispersity.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of metallurgical sludge, in particular to a dehydration and drying method and device for metallurgical sludge. Background technique [0002] In the process of blast furnace ironmaking and converter steelmaking in iron and steel enterprises, wet washing is used to purify gas, and "blast furnace gas washing mud" and "converter gas washing mud" are produced respectively. At this time, the solid concentration in the mud is less than 5%. After settlement, it can reach 5% to 15%. Steel plants generally concentrate and dehydrate sludge before transporting or utilizing it. Blast furnace gas washing mud and converter gas washing mud belong to the category of metallurgical waste, but the sludge contains high-grade iron, carbon, calcium, magnesium and other beneficial elements. If it is landfilled, it will not only cost landfill fees, but also Waste precious iron-containing and carbon-containing re...

AI Technical Summary

Problems solved by technology

Blast furnace gas washing mud and converter gas washing mud belong to the category of metallurgical waste, but the sludge contains high-grade iron, carbon, calcium, magnesium and other beneficial elements. If it is landfilled, it will not only cost landfill fees, but also Waste precious iron and carbon resources

Therefore, general iron and steel plants have carried out recycling and recycling, but the sludge slurry has extremely fine particle size and high viscosity, and it is easy to produce secondary pollution during transportation and utilization.

In recent years, as ironworkers have paid more attention to the enrichment of harmful elements in blast furnaces caused by the recycling of metallurgical sludge, many enterprises have adopted wet beneficiation to separate harmful elements. The disadvantage is that the treatment effect is insufficient. Good, the throwing tail is relatively large, and there is still a large pollution to the environment

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