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Oxidizing roasting method of high-impurity copper-containing molybdenum concentrate rotary kiln

A technology of oxidation roasting and rotary kiln, which is applied in the field of metal smelting technology, can solve the problems of difficult operation, incomplete oxidation, sintering and wrapping, etc., and achieve the effect of unique process conditions

Inactive Publication Date: 2017-12-08
JIANGXI COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Rotary kiln oxidation roasting of molybdenum concentrate is a traditional process method with mature technology and stable process, but this process method has certain restrictions on copper impurities in molybdenum concentrate. Generally, the copper grade is required to be less than 0.5%, which is more suitable For the molybdenum concentrate produced from a single molybdenum ore, for the high copper-containing molybdenum concentrate produced from associated metal ores, the increase in copper grade will bring disadvantages to the oxidation and roasting process of the molybdenum concentrate , due to the fusibility of copper, it is easy to sinter and wrap during the roasting process, and the generated copper, iron molybdate and MoO 3 It is easy to form low-melting eutectics, which will harden the calcined sand, resulting in difficulties in operation and unqualified calcined sand quality
Before the present invention, when the traditional rotary kiln oxidation roasting process was used to process high-impurity copper-molybdenum concentrates, the oxidation was often incomplete, the calcine was easily sintered, and the calcine molybdenum ammonia leaching rate was low, only about 85%. A large number of experiments, technological conditions and equipment parameters were explored, and a method of oxidation roasting in a rotary kiln for high-impurity copper-molybdenum concentrates was found.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A rotary kiln oxidation roasting method for high-impurity copper-containing molybdenum concentrate, the rotary kiln specification Ф1200×24000, the production capacity of molybdenum concentrate: 185kg / h, the process steps are as follows: a) The installation slope of the rotary kiln cylinder is set at 1.2% , the cylinder speed is controlled to 0.24r / min, b) turn on the blower and diesel pump, turn on the fuel injectors in each temperature zone and ignite and heat, turn on the induced draft fan, control the air supply speed to 1.45 m / s, c) turn on the temperature The temperature control of the zone is: the temperature of the preheating zone is 360-420°C, the temperature of the heat-proof zone is 430-480°C, the temperature of the sintering zone is 480-520°C, and the temperature of the deep oxidation zone is 650-690°C. d) The high-impurity copper-containing molybdenum concentrate is evenly fed into the rotary kiln through the screw conveyor, the oxidation roasting starts, and...

Embodiment 2

[0033] A rotary kiln oxidation roasting method for high-impurity copper-containing molybdenum concentrate, the rotary kiln specification Ф1200×24000, the production capacity of molybdenum concentrate: 200kg / h, the process steps are as follows: a) The installation slope of the rotary kiln cylinder is set at 1.2% , the cylinder speed is controlled to 0.32r / min, b) turn on the blower and diesel pump, turn on the fuel injectors in each temperature zone and ignite and heat, turn on the induced draft fan, and control the air supply speed to 1.2 m / s, c) turn on the temperature zone The temperature control of the zone is: the temperature of the preheating zone is 360-420°C, the temperature of the heat-proof zone is 430-480°C, the temperature of the sintering zone is 480-520°C, and the temperature of the deep oxidation zone is 650-690°C. d) The high-impurity copper-containing molybdenum concentrate is evenly fed into the rotary kiln through the screw conveyor, the oxidation roasting sta...

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PUM

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Abstract

The invention discloses a rotary kiln oxidation roasting method for a high-impurity copper-molybdenum concentrate, which relates to the technical field of metal smelting. The kiln adopts external heating, the rotating speed of the cylinder is controlled at 0.24-0.32r / min, the installation slope of the cylinder is set at 1.2%, the air supply speed is controlled at 1.2-1.5 m / s, and the oxidation and roasting in each working temperature zone Controlled at an appropriate temperature, the high-impurity copper-molybdenum concentrate can be oxidized into molybdenum calcine that meets the quality requirements, which solves the problem of easy sintering in the oxidation process of high-impurity copper-molybdenum concentrate. The ammonia leaching rate of molybdenum calcine reaches 98.5% %above.

Description

technical field [0001] The invention relates to the technical field of metal smelting technology, and aims at a process method of oxidizing and roasting a high-impurity copper-molybdenum concentrate using a rotary kiln. Background technique [0002] Rotary kiln oxidation roasting of molybdenum concentrate is a traditional process method with mature technology and stable process, but this process method has certain restrictions on copper impurities in molybdenum concentrate. Generally, the copper grade is required to be less than 0.5%, which is more suitable For the molybdenum concentrate produced from a single molybdenum ore, for the high copper-containing molybdenum concentrate produced from associated metal ores, the increase in copper grade will bring disadvantages to the oxidation and roasting process of the molybdenum concentrate , due to the fusibility of copper, it is easy to sinter and wrap during the roasting process, and the generated copper, iron molybdate and MoO...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B34/34
CPCC22B1/02C22B34/34
Inventor 郭株辉汪饶荣
Owner JIANGXI COPPER
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