CN101830709A - Process method for roasting vanadium pentoxide - Google Patents

Abstract

The invention discloses a process method for roasting vanadium pentoxide. The method comprises the following steps of: a, smashing raw ore soil and coal, mixing and uniformly stirring the raw ore soil and the coal and briquetting mixed powder into hollow bricks by using a brick making machine; and b, roasting: piling the hollow bricks on a kiln car, delivering the kiln car into a tunnel kiln one section after another for roasting and circularly feeding one section of raw material after discharging one section of clinker, wherein the tunnel kiln consists of a preheating section, a burning section and a cooling section; air flows directionally from the cooling section to the preheating section through the burning section; and a wet material in the preheating section can be dried by hot air stream passing through the burning section, so that successful burning of the raw material after entering the combustion section is ensured without affecting the temperature of the burning section. The bricks are made by using the brick making machine, so that energy consumption is lowered. The tunnel kiln is enclosed and heat insulated, has centralized heat energy, roasts at a constant temperature and has small temperature fluctuation, so that the dosage of the coal is reduced by over 8 percent compared with a semi-open flat kiln. Simple operation and high yield are achieved. Calculated based on the annual output of 600 tons of vanadium pentoxide, about 6,100 tons of the coal serving as the raw material can be saved every year.

Description

A kind of process method for roasting of Vanadium Pentoxide in FLAKES

Technical field

The present invention relates to a kind of process method for roasting of Vanadium Pentoxide in FLAKES.

Background technology

At present, the technological process of production of Vanadium Pentoxide in FLAKES is: with original ore soil, coal dust broken → prepare burden and stir → add the pellet immersion → extraction finished product after water is made pellet → pellet roasting → roasting.

What the pellet roasting was adopted is the flat kiln of semi-open-type, has following shortcoming:

1, temperature is wayward.Because the product maturing temperature must be between 800 ℃-850 ℃, when temperature was higher than 850 ℃, pellet can sinter bulk into because temperature is too high in the stove, included vanadium and was difficult for leaching, and stop up burner hearth easily.When temperature was lower than 800 ℃, various raw material chemical reactions were abundant inadequately in the pellet, and the Vanadium Pentoxide in FLAKES of generation will obviously reduce.Extremes of temperature all can influence ultimate capacity.Semi-open-type kiln characteristics have determined the existing ratio defective product instability of enterprise.So temperature control has just become an of paramount importance job in the whole production link.

2, heat-insulating property is poor, because flat kiln opening for feed of semi-open-type and blast inlet are many, the heat that coal combustion produces runs off very fast, and the proportion relation of original ore soil and coal (mass percent) is: original ore soil is 85～87%, and coal is 13～15%.

3, energy consumption is big.Because it is very fast that the coal-fired heat that produces runs off, for guaranteeing the required temperature of roasting, when batching, must strengthen the consumption of coal, finished product per ton consumes 38 tons in raw coal.When sensible temperature was hanged down, the mode of spreading coal dust with hand increased fuel and improves temperature, and the hand of product consumption per ton spreads the coal dust amount and is about 6.16 tons.Live the mode of duration and degree of heating and reduce temperature to reduce oxygen-supplying amount and addition material spherical cap when the semi-open-type kiln temperature is high.In whole roasting process, also need the workman often to stir pellet in the stove, so that pellet thermally equivalent and burning.

4, system ball current consumption, water loss are big.

Summary of the invention

In order to solve the existing big shortcoming of energy consumption that adopts the flat kiln roasting of semi-open-type to exist, the present invention proposes a kind of process method for roasting of Vanadium Pentoxide in FLAKES.

For this reason, technical scheme of the present invention is as follows: a kind of process method for roasting of Vanadium Pentoxide in FLAKES, and concrete steps are: a, original ore soil, coal dust is broken, prepare burden and stir, with brick press the powder for preparing is pressed into hollow brick;

B, roasting: hollow brick is piled up on kiln car, and kiln car one saves into tunnel furnace roasting, goes out a joint grog, advances joint raw material, so a circulation; Described tunnel furnace is made of preheating section, burning zone, cooling section, air by cooling section through burning zone to the preheating section directed flow, can utilize hot gas flow to come the wet feed of drying and forewarm section, guarantee to burn smoothly after raw material enter burning zone, and do not influence the burning zone temperature through burning zone.

Beneficial effect:

1, adopts brick press brickmaking, reduced energy consumption.

2, adopt tunnel furnace to reduce the proportioning of feed coal, because kiln body closed heat insulation, centralized heat energy keeps the fire coal of the temperature required consumption of roasting to descend, constant temperature calcining, and temperature fluctuation is little, and the amount ratio of coal adopts the flat kiln of semi-open-type to reduce more than 8%.3, simple to operate, the yield rate height.4, calculate by producing 600 tons of Vanadium Pentoxide in FLAKESs per year, can save about 6100 tons in coal in 1 year.

Embodiment

The process method for roasting of Vanadium Pentoxide in FLAKES, concrete steps are: a, original ore soil, coal dust is broken, prepare burden and stir, with brick press the powder for preparing is pressed into hollow brick; The proportion relation of original ore soil and coal (mass percent) is: original ore soil is 93～95%, and coal is 8～5%.

B, roasting: hollow brick is piled up on kiln car, and one saves into tunnel furnace roasting, goes out a joint grog, advances joint raw material, so a circulation; Described tunnel furnace is made of preheating section, burning zone, cooling section, air by cooling section through burning zone to the preheating section directed flow, can utilize hot gas flow to come the wet feed of drying and forewarm section, guarantee to burn smoothly after raw material enter burning zone, and do not influence the burning zone temperature through burning zone.The maturing temperature of burning zone is generally between 800 ℃-850 ℃.

Claims (1)

1. the process method for roasting of a Vanadium Pentoxide in FLAKES, concrete steps are:

A, original ore soil, coal dust is broken prepares burden and stirs, and with brick press the powder for preparing is pressed into hollow brick;

B, roasting: hollow brick is piled up on kiln car, and kiln car one saves into tunnel furnace roasting, goes out a joint grog, advances joint raw material, so a circulation; Described tunnel furnace is made of preheating section, burning zone, cooling section, air by cooling section through burning zone to the preheating section directed flow, can utilize hot gas flow to come the wet feed of drying and forewarm section, guarantee to burn smoothly after raw material enter burning zone, and do not influence the burning zone temperature through burning zone.