Pelletizing and calcination method for vanadium-containing stone coal ash

Abstract

The invention relates to a pelletizing and calcination method for vanadium-containing stone coal ash. The equipment adopted by the method includes a moving-bed calcinator, which comprises a vertical furnace body, a chimney, a clinker discharger and a fan. The method includes the following steps that: NaCl, CaF2 and CaCO3 are prepared into complex additive, vanadium-containing stone coal, the complex additive and anthracite or stone coal as fuel needed by calcination are mixed into mixture material, the mixture material is uniformly mixed, fine-ground and pelletized into raw pellets, the raw pellets are fed into the furnace body via a feeder on the top of the furnace body, meanwhile, the fan blows the air into the furnace body via the clinker discharger on the bottom of the furnace body, the raw pellets and the air are calcined and reversely flow under the internal temperature condition of 800 DEG C to 900 DEG C, the calcined material enters the clinker discharger and is discharged out of the furnace body via the clinker discharger, and after cooling, clinker for the leaching of V2O5 is produced; and after calcination, the air is exhausted out via the chimney on the top of the furnace body. The technique and the equipment adopted by the method are relatively simple, the heat utilization rate is high, the product quality is stable, and the production cost is low.

Description

(1) Technical field [0001] The invention relates to a ball-forming and roasting method of vanadium-containing stone coal ash (2) Background technology [0002] Vanadium is an important strategic material. Humans have discovered vanadium 160 years ago, but it was not until the beginning of the 20th century that it was applied to industrial production. The pure metal vanadium is silver-gray, has good ductility and corrosion resistance. There are many kinds of vanadium products, including metallurgical products such as high-purity metal vanadium, vanadium iron, vanadium aluminum alloy, vanadium carbide and vanadium carbonitride, as well as vanadium pentoxide, ammonium metavanadate, potassium vanadate, sodium vanadate , vanadium hydroxide and vanadium chloride and other chemical products. Because vanadium has the characteristics of high melting point and easy deformation and processing, it is widely used in the fields of iron and steel industry, cutting-edge defense technolog...

AI Technical Summary

Problems solved by technology

This is not conducive to large-scale continuous mechanized cloth and discharge

2. The wet raw meal has irregular shape and uneven size

Causes clinker vanadium conversion rate to fluctuate and quality unstable

3. Raw meal powder has no calorific value

Rotary kiln has the advantages of large production scale and high degree of mechanization, but there are still many disadvantages

First of all, the temperature of the exhaust gas at the tail of the rotary kiln is generally above 600°C, and the exhaust gas contains a lot of acidic corrosive gases. If the exhaust gas is directly treated and discharged, the energy utilization efficiency will be greatly reduced; if the waste heat of the waste gas is used, the waste heat must be solved The problem of corrosion of heating surface in use

Secondly, the temperature of the clinker at the kiln head of the rotary kiln is generally around 500°C. If it is necessary to cool and recover heat energy, it is bound to increase the heat exchange equipment in front of the kiln head, which increases the complexity of the equipment system

Images