Preparation method and application of lime nitrogen

Abstract

The invention provides a preparation method and application of lime nitrogen. The preparation method comprises the following steps: after crushing calcium carbide in a crushing machine, grinding calcium carbide into fine powder, and crushing fine-powdery calcium carbide, fluorite and circulated lime nitrogen into powder smaller than 100mm, and lifting the powder to a magnet separator by virtue of a lifting machine, so as to remove iron impurities; then crushing the powder to be smaller than 20mm by virtue of a hammer crusher, and lifting to the powder into a calcium carbide storage hopper by virtue of a lifting machine; feeding the powder into a ball mill, milling the powder to be capable of passing a 80mesh sieve, and feeding the powder into a furnace material storage hopper; when the temperature of a settling furnace is higher than 800 DEG C, feeding furnace materials into the settling furnace, supplying pure nitrogen into the settling furnace, heating the furnace materials to be 500-600 DEG C, and carrying out nitridation, wherein the nitridation temperature is maintained at 1000-1100 DEG C, and the nitrogen pressure is 0.6kPa-0.8kPa; when the temperature of the settling furnace is lower than 800 DEG C, stopping feeding, and feeding after the temperature rises. According to the preparation method, the product quality can be improved, the production cost can be lowered, and wasting of resources can be reduced.

Description

technical field [0001] The invention relates to a preparation method of lime nitrogen and its application. Background technique [0002] Lime nitrogen, also known as calcium cyanamide, is the raw material for the production of cyanamide, dicyandiamide, sulfur gland and carbendazim. It can be used as metal heat treatment agent and desulfurizer in iron and steel operations, and can be used as base fertilizer in agriculture. At present, the consumption of lime nitrogen for the production of cyanamide and dicyandiamide in my country accounts for 60% of the total consumption of lime nitrogen, and the consumption for the production of thiourea and carbendazim accounts for about 35% of the total consumption of lime nitrogen. The consumption used in the agricultural field only accounts for about 5% of the total consumption of lime nitrogen. [0003] In recent years, with the rising raw material prices of lime nitrogen production and the increase of other expenses, the production cos...

AI Technical Summary

Problems solved by technology

[0003] In recent years, with the rising raw material prices of lime nitrogen production and the increase of other expenses, the production cost of lime nitrogen has increased, while the development and application of downstream products of lime nitrogen has shown a weak trend. The development prospect of lime nitrogen for industrial use is not optimistic, but the development of lime nitrogen for agricultural Nitrogen market is in the stage of warming up, and the market prospect is promising