Method and apparatus for preparing calcium carbide by oxygen-fuel blowing of high furnace

Abstract

The invention relates to field of preparing calcium carbide with oxygen jetting in tower furnace. The calcium carbonate is heat decomposed into calcium oxide and reduced to calcium carbide by carbon material by jetting with preheating oxygen or oxygen-enriched air. The device comprises: tower furnace and systems of feeding, charging, oxygen producing, heating air, blasting air, oxygen enriching, jetting, cooling, cleaning and recoverying coal gas and recovering calcium carbide and ferrosilicon. The ration between said furnace height and furnace hearth diameter is less than or equal to 3.5, and diameter ratio between furnace hearth and furnace hearth is 0.8-1.1. The invention is to produce calcium carbide of 80%, the proportioning of raw material is lime carbonate: coke: fluorite =(1.2-2.0): (1.5-4.0): (0.039-0.046); jetting material is coal powder, light oil or natural gas; relative oxygen-enriched air amount, the xygen-enriched rate is 9-39%, and prepares side products of calcium carbide of more than 65%, ferrosilicon more than or equal to 54% and carbon monoxide of more than or equal to 54% at high temperature. The invention is characterized by energy saving, high quality and environmental protection.

Description

technical field [0001] The present invention is that shaft furnace method produces calcium carbide (CaC 2 ) technical field. It mainly adopts oxygen or oxygen-enriched injection technology, forms a high-temperature reduction zone in the shaft furnace, and produces calcium carbide through thermal decomposition of calcium carbonate and reduction of calcium oxide with carbon materials. Background technique [0002] Calcium carbide is an important chemical raw material, known as the "mother of the organic chemical synthesis industry". The ability to synthesize thousands of organic products has the same significance as petroleum. It is widely used as a raw material for synthetic plastics, rubber, fibers, medicines, pesticides, dyes, resins, and solvent organic compounds. It can also be directly used as a desulfurizer in the iron and steel industry to produce high-quality steel and for metal welding and cutting. In addition, refer to accompanying drawing 1 for the synthetic prod...

AI Technical Summary

Problems solved by technology

The disadvantages of the Japanese shaft furnace full-coke oxythermal method and the German shaft furnace production of calcium carbide method are mainly the consumption of a large amount of pure oxygen and coke, of which the coke consumption is 4 times that of the electric furnace electrothermal method, resulting in a higher production cost than the electric furnace Electrothermal method

Therefore, it is difficult to obtain industrial application

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