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A moving bed roasting process for low-grade molybdenum concentrate

A moving bed, low-grade technology, applied in the field of molybdenum metallurgy, can solve the problems of inability to process low-grade molybdenum concentrates, achieve the effects of inhibiting the formation of insoluble molybdate, increasing the concentration of SO2, and improving efficiency

Active Publication Date: 2016-06-15
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This application solves the problem that the traditional roasting process cannot process low-grade molybdenum concentrates by developing a process for efficiently roasting low-grade molybdenum concentrates in a moving bed

Method used

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  • A moving bed roasting process for low-grade molybdenum concentrate
  • A moving bed roasting process for low-grade molybdenum concentrate
  • A moving bed roasting process for low-grade molybdenum concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For the molybdenum concentrate with a molybdenum grade of 39.27wt% and a sulfur content of 29.73wt% (see Table 1 for the chemical composition of the raw materials), a chain grate treatment process is used to obtain molybdenum calcined sand after drying, oxidation roasting, and cooling; the chain grate drying section The lengths of , roasting section I, roasting section II, and cooling section account for 5%, 45%, 25%, and 25% of the effective total length (working area) of the grate respectively; 70% of the hot exhaust gas in the cooling section is introduced into the drying section, and the roasting The hot exhaust gas produced in the second section and 30% of the hot exhaust gas in the cooling section are introduced into the roasting section I, the gas is burned to heat the air to provide the hot gas required for the roasting section II, and the air is blown into the cooling section for cooling, and the gas in the hood of the drying section is controlled The temperatur...

Embodiment 2

[0035]For the molybdenum concentrate with a molybdenum grade of 44.13wt% and a sulfur content of 33.70wt% (see Table 1 for the chemical composition of the raw material), a chain grate treatment process is used to obtain molybdenum calcined sand after drying, oxidation roasting, and cooling; the chain grate drying section , The lengths of roasting section I, roasting section II, and cooling section account for 10%, 50%, 30%, and 10% of the effective total length (working area) of the grate respectively; the hot exhaust gas from the cooling section is introduced into the drying section, and the roasting section II The hot exhaust gas produced is introduced into the roasting section I, and part of the air is mixed in the smoke hood of the roasting section I, and the gas is burned to heat the air to provide the hot gas required for the roasting section II, and the air is blown into the cooling section for cooling. Control the gas temperature in the hood of the drying section to 270...

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Abstract

The invention discloses a process for roasting low-grade molybdenum concentrate in a moving bed. The process is to continuously transport the low-grade molybdenum concentrate material to a horizontally running moving bed, and four smoke hoods are arranged side by side on the upper part of the moving bed. The four fume hoods divide the working section of the moving bed into drying section, roasting section I, roasting section II and cooling section in turn in the horizontal direction. The materials described in this paper pass through the lower part of the four fume hoods to complete drying, two roasting and cooling in sequence. process to obtain molybdenum oxide calcined sand, and at the same time, desulfurize the flue gas obtained in the first stage of roasting to produce acid. This process can effectively improve the oxidation roasting efficiency of low-grade molybdenum concentrate, reduce the formation of insoluble molybdate, and comprehensively recover sulfur dioxide roasting tail gas; The process is simple, the production cost is low, and it can be widely used.

Description

technical field [0001] The invention relates to a process for roasting low-grade molybdenum concentrate in a moving bed, which belongs to the molybdenum metallurgy industry in the field of nonferrous metallurgy. Background technique [0002] my country is rich in molybdenum reserves, and the reserves of molybdenum metal rank second in the world after the United States, accounting for about 25% of the global molybdenum resources. At present, there are more than 20 kinds of molybdenum-containing minerals identified, of which 99% of molybdenum exists in the form of molybdenite, which has the highest industrial value. The types of molybdenum deposits are complex, and the molybdenum reserves of a single ore only account for 29.7% of the total reserves in the country, while the rest are copper-molybdenum, molybdenum-tungsten, and molybdenum-iron deposits. Because molybdenum deposits in my country are mainly of low grade, and most of them are refractory paragenetic ores, the grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/26C22B34/34
Inventor 甘敏范晓慧张麟姜涛邱冠周王勇邓琼陈许玲李光辉曾祥龙程志华李伟王海波曾金林袁礼顺
Owner CENT SOUTH UNIV
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