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Device and technology for oxygen-enriched roasting of molybdenum sulfide concentrate

An oxygen-enriched roasting and molybdenum sulfide technology is applied in the field of roasting equipment and processes for molybdenum sulfide concentrate to achieve the effects of reducing operation difficulty, easy control and stabilizing product quality

Inactive Publication Date: 2012-11-28
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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  • Application Information

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Problems solved by technology

However, since the oxidant for the reaction is oxygen in the air, and the air used as the oxidant contains a large amount of nitrogen and other gases, these gases must be heated to about 500°C, and the tail gas will take away a large amount of heat. Therefore, auxiliary heating is still required in the reaction process.

Method used

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  • Device and technology for oxygen-enriched roasting of molybdenum sulfide concentrate
  • Device and technology for oxygen-enriched roasting of molybdenum sulfide concentrate

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Embodiment Construction

[0022] Oxygen-enriched air is used instead of ordinary air as the oxidant for oxidation roasting to produce industrial molybdenum oxide. Oxygen-enriched air can be produced with industrial oxygen or with an oxygen generator.

[0023] A small industrial roasting rotary kiln (Φ1000mm×20000mm) exhaust gas (mainly composed of nitrogen, oxygen, and sulfur dioxide) emission per hour is 11000m 3 Around, the temperature of the exhaust gas is about 350°C~400°C (623k~673k).

[0024] Heat taken away (kJ / h) Q=Cp×m×Δk=Cp×ρ×V×(k 2 -k 1 )

[0025] Cp—constant pressure hot melt, 1.009kJ / kg k

[0026] m-quantity, kg

[0027] Δk-temperature difference, k

[0028] ρ—density, 1.293kg / m 3

[0029] V—volume, m 3

[0030] Therefore, the heat taken away by an industrial rotary kiln per hour (the specific heat capacity of the exhaust gas is approximately calculated according to the specific heat capacity of the air):

[0031] Q 1 =1.009kJ / kg·k×1.293kg / m 3 ×11000m 3 ×(623k-293k)=4.74×10 ...

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Abstract

The invention discloses a device for oxygen-enriched roasting of a molybdenum sulfide concentrate, characterized in that the device at least comprises a kiln body made of refractory bricks and thermal insulation materials, support rollers for supporting the kiln body, and transmission gears for driving the kiln body to rotate, wherein the upstream of the kiln body is provided with a feeding machine for promote raw materials to be fed to the downstream and an induced draft fan for absorbing oxygen-enriched air from the downstream, the feed inlet of raw material molybdenum concentrate is arranged at the upstream of the kiln body, the discharge hole of molybdenum concentrate is arranged at the downstream of the kiln body; the inlet of oxygen-enriched air is arranged at the downstream of the kiln body, the outlet of sulfur dioxide is arranged at the upstream of the kiln body, a tail gas flue is arranged at the upstream of the kiln body, and an auxiliary heating device for keeping the temperature of the kiln body is arranged on the side wall of the kiln body. According to the invention, energy saving and consumption reduction are benefited, the centralized processing and utilization of tail gas is convenient, the operation is convenient, and the recovery rate of metal molybdenum is raised.

Description

technical field [0001] The invention relates to a molybdenum sulfide concentrate roasting equipment and process, in particular to a molybdenum sulfide concentrate oxygen-enriched roasting equipment and process. Background technique [0002] The first step in the smelting process of molybdenum concentrate produced from molybdenum mines is oxidation roasting, which converts molybdenum sulfide into industrial molybdenum oxide. [0003] At present, the general equipment for roasting process mainly includes reverberatory furnace, rotary kiln and multi-hearth furnace. The energy-saving and environmental protection performance of the reverberatory furnace is poor, and the investment of the multi-hearth furnace is particularly large. The energy-saving and environmental protection performance of the rotary kiln is good, and the investment is low. Therefore, the rotary kiln will be the main production equipment for the oxidation and roasting of molybdenum concentrate. [0004] Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/34
Inventor 徐双刘剑冷怀恩段福林
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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