Pelletizing and calcination method for vanadium-containing stone coal ash

A coal ash slag and pelletizing technology, which is applied in the field of pelletized roasting of vanadium-containing coal ash slag, can solve problems that are not conducive to large-scale continuous mechanized material distribution and discharge, increase the complexity of equipment systems, and irregular shapes of wet raw materials and other problems, to achieve the effects of easy mechanized unloading, easy control of roasting time and temperature, and high utilization rate of heat energy.

Inactive Publication Date: 2010-10-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Pelletizing and calcination method for vanadium-containing stone coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 15kg of lime ash after burning and decarburizing at 890-910°C in the 1MW large-scale circulating fluidized bed test bench of Zhejiang University Thermal Engineering Institute (its chemical composition is: V 2 o 5 1.39%, SiO 2 67.04%, Fe 2 o 3 7.65%, Al 2 o 3 17.84%, CaO 1.64%, MgO 1.94%), adding composite additives, including 0.3kg of NaCl, 0.75kg of CaF 2 and 2.1 kg of CaCO 3 , plus 1.05kg of anthracite, the calorific value of the mixed material is 1898kJ / kg, mix evenly and grind to a size below 80 mesh to obtain raw meal powder, then add water to form a ball, the ball contains 17% moisture, and the ball diameter is 5-8mm. Fill the ball into the top of the laboratory moving bed roasting test furnace with an inner diameter of 120mm and a height of 1000mm, roast at 830-850°C for 2 hours, and discharge the clinker after cooling at the lower part of the roaster. Mass (kg) to liquid volume (L) ratio of 1: 2.5 dilute sulfuric acid solution at room temperature...

Embodiment 2

[0040] Take 15kg of lime ash after burning and decarburizing at 890-910°C in the 1MW large-scale circulating fluidized bed test bench of Zhejiang University Thermal Engineering Institute (its chemical composition is: V 2 o 5 1.39%, SiO 2 67.04%, Fe 2 o 3 7.65%, Al 2 o 3 17.84%, CaO 1.64%, MgO 1.94%), adding composite additives, including 0.3kg of NaCl, 0.75kg of CaF 2 and 2.1 kg of CaCO 3 , plus 0.9kg of anthracite, the calorific value of the mixed material is 1626kJ / kg, mix evenly and grind to below 80 mesh to obtain raw meal powder, then add water to form a ball, the ball contains 14.5% moisture, and the ball diameter is 5-8mm. Fill the top of the laboratory moving bed roasting test furnace with an inner diameter of 120mm and a height of 1000mm, roast at 820-840°C for 2.5 hours, and discharge the clinker after cooling at the lower part of the roaster. After the clinker is ground, the volume concentration is 2%, The ratio of solid mass (kg) to liquid volume (L) is ...

Embodiment 3

[0042] Take 15kg of lime ash after burning and decarburizing at 890-910°C in the 1MW large-scale circulating fluidized bed test bench of Zhejiang University Thermal Engineering Institute (its chemical composition is: V 2 o 5 1.39%, SiO 2 67.04%, Fe 2 o 3 7.65%, Al 2 o 3 17.84%, CaO 1.64%, MgO 1.94%), adding composite additives, including 0.3kg of NaCl, 0.75kg of CaF 2 and 2.1 kg of CaCO3 , plus 3.575kg of stone coal before decarburization, the calorific value of the mixed material is 1643kJ / kg, mix evenly and grind it to below 80 mesh to get raw meal powder, then add water to form a ball, the ball contains 16.5% moisture, and the ball diameter is 5-8mm . The balls are added to the top of the laboratory moving bed roasting test furnace with an inner diameter of 120mm and a height of 1000mm, roasted at 825-845°C for 2.5 hours, and discharged the clinker after cooling at the lower part of the roaster. After the clinker is ground, the volume concentration is 2%, The rat...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/22
Inventor 骆仲泱施正伦岑可法方梦祥高翔王勤辉程乐鸣周劲松余春江王树荣倪明江
Owner ZHEJIANG UNIV
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