Vacuum rotary kiln and application process thereof

A rotary kiln and vacuum technology, applied in the field of vacuum rotary kiln and its application technology, can solve the problems of flying dust, short residence time of ore materials affecting roasting quality, etc., and achieve the effect of expanding heat transfer area, ensuring strength and good effect

Inactive Publication Date: 2012-12-12
伍耀明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vacuum rotary kiln and its application process, using oxygen-enriched temperature-controlled hot air for indirect heating and roasting, and installing spiral deflectors, lifting plates and fins in the rotary kiln to solve the problem of using hot air in the prior art. Heating in direct contact with the mineral material causes dust to fly, and the residence time of the mineral material in the rotary kiln is short, which affects the roasting quality

Method used

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  • Vacuum rotary kiln and application process thereof
  • Vacuum rotary kiln and application process thereof

Examples

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Effect test

Embodiment 1

[0040] It is used for vacuum dehydration of coexisting minerals of pyrite and pyrite.

[0041] Maintain a stable temperature of 300°C during dehydration to avoid decomposition of pyrite and pyrite due to occasional overheating. Due to the vacuum, the dehydration speed is faster than normal pressure at the same temperature; due to the rapid tumbling and dispersion of the material, the moisture inside the material escapes quickly; the temperature of 300 ° C is much higher than the boiling point of water, and the surface of the material It is easier for water to leave the material; the forward and reverse operation is adopted to make the material turn over more thoroughly, so the moisture content of the material after dehydration is less than 0.5%. The equipment is equipped with three water vapor cyclone condensers, blowing cold air through the coil pipes, expanding the cooling area, and making the evaporated water vapor leave the surface of the material faster, so the vacuum deh...

Embodiment 2

[0043] The vacuum rotary kiln described in Example 1 is used for roasting desulfurization and arsenic removal of refractory gold ores containing arsenic and sulfur.

[0044] Refractory gold ores are mostly flotation ores with a high water content, and they are also minerals where pyrite and pyrarsenite coexist. The method described in Example 1 needs to be used for vacuum dehydration.

[0045] The arsenic-bearing gold ore in a certain place contains Au80g / t, As20%, S20%, and the minerals are mainly pyrite and pyrite. For this kind of gold ore, after the first step is vacuum dehydration at 300°C, enter the second step of 500°C vacuum thermal decomposition pyrite desulfurization, use wind condensation drum to recover elemental sulfur, and the third step enters 750°C vacuum thermal decomposition of sulfur arsenic Arsenic removal from iron ore uses an air-cooled drum to condense and collect metallic arsenic at a temperature of 400°C. The volatile recovery rate of arsenic reaches ...

Embodiment 3

[0048] The vacuum rotary kiln described in Example 1 is used for roasting, desulfurization, arsenic and decarburization of extremely refractory gold ores containing arsenic, sulfur and carbon

[0049] The first step is vacuum dehydration, the second step is vacuum desulfurization, and the third step is vacuum arsenic removal. Since the first three steps are all carried out under vacuum, the C in the gold mine has not been burned, and the remaining FeS has not been decomposed. Then go to the fourth step to add a proper amount of pyrite for sulfuric acid production at 850 ° C. Under normal pressure, carry out airtight desulfurization and decarburization with oxygen-enriched roasting, and the produced SO 2 sulfuric acid. The calcined sand produced is conveyed and cooled by an air-cooled screw machine. The cooled calcined sand is used for wet gold extraction, and the hot air generated by the cooled calcined sand is returned for controlled vacuum dehydration at 300°C.

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Abstract

The invention provides a vacuum rotary kiln. A hot air pipe, spiral guide plates and T-shaped lifting boards are mounted in the vacuum rotary kiln; one T-shaped lifting board is mounted between each two spiral guide plates; the hot air pipe comprises a kiln head center main air pipe, a kiln tail center main air pipe and branch air pipes; the branch air pipes are annularly distributed between the kiln head center main air pipe and the kiln tail center main air pipe; the branch air pipe located at the center is communicated with the kiln head center main air pipe and the kiln tail center main air pipe; the both ends of the other branch air pipes are gathered with the kiln head center main air pipe and the kiln tail center main air pipe; and 4-8 fins are respectively welded on the outer wall of the branch air pipe at the center uniformly. A process of roasting refractory gold comprises the steps of preparing sulfuric acid by using SO2 after vacuum dehydration, desulfuration and dearsenification. The vacuum rotary kiln is used for roasting in a metallurgy process, so that heat of mineral itself can be sufficiently used. Thus, the vacuum rotary kiln has the advantages of uniform material heating, less powder dust and high capability.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal pyrometallurgy, in particular to a vacuum rotary kiln and an application process thereof. Background technique [0002] At present, with the rapid development of my country's iron and steel industry, high-grade and easy-to-select iron ore resources are on the verge of exhaustion, and with the sustained and rapid economic development, the demand for molybdenum, nickel and other metals is also increasing year by year, resulting in the above metals Rich ore resources are gradually exhausted. In my country, low-grade and low-sulfur sulfide ores, extremely difficult-to-treat gold ores containing sulfur, arsenic and carbon, and molybdenum-nickel ore, molybdenite and gold-antimonite that are easy to sinter and require strict control of temperature roasting are widely distributed in China, but because there is no More scientific equipment and process methods, these metal minerals can not be effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/10F27B7/16F27B7/34F27B7/42
Inventor 伍耀明
Owner 伍耀明
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