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Roasting method for laterite-nickel ore pellets

A laterite nickel ore roasting technology, which is applied in the field of metallurgy, can solve the problem that the chlorination segregation process fails to realize large-scale treatment of laterite nickel ore industrial applications, reduce the partial pressure of the decomposition components of the chlorination agent, and incomplete chlorination segregation reactions, etc. problem, to achieve the effect of increasing production capacity, reducing production cost and increasing furnace temperature

Inactive Publication Date: 2019-08-02
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the roasting method using direct heating of materials has not been able to achieve the desired effect, resulting in the industrial application of large-scale treatment of laterite nickel ore in the chlorination separation process.
The chlorination separation process needs to be completed in a weak reducing atmosphere and a certain hydrogen chloride atmosphere. However, when the gas is used to directly heat the material, the components of the gas and its products will affect the roasting atmosphere, especially reducing the composition of the decomposition components of the chlorinating agent in the system. Pressure, resulting in incomplete chlorination segregation reaction

Method used

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  • Roasting method for laterite-nickel ore pellets
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  • Roasting method for laterite-nickel ore pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 Shown, a kind of roasting method of laterite nickel ore pellet, comprises the steps:

[0034] 1) Feed the pellets obtained by the pellet preparation system 01 into the grate machine 02 for preheating, the temperature is controlled to be less than 400°C, and the preheated pellets are sent into the pellets by the bucket elevator 03 and the chain conveyor 04 Retort furnace 05.

[0035] 2) Feed the preheated pellets into the indirect heating tank furnace 05 for composite roasting. The calcination temperature is controlled at 900-1100° C., and the calcination reaction time is 30-90 minutes.

[0036] 3) The calcined sand balls roasted by the pot furnace enter the water jacket cooling box 06 to cool down to less than 200°C, and then are discharged by the discharge machine 07, and are supplied to the subsequent beneficiation operation to select nickel concentrate.

[0037] Such as Figure 3 to Figure 6 As shown, the structure of the retort furnace 05 used i...

Embodiment 2

[0044] Such as figure 2 Shown, a kind of roasting method of laterite nickel ore pellet, comprises the steps:

[0045] 1) Feed the pellets obtained by the pellet preparation system 01 into the grate machine 02 for preheating, the temperature is controlled to be less than 400°C, and the preheated pellets are sent into the pellets by the bucket elevator 03 and the chain conveyor 04 Retort furnace 05.

[0046] 2) Feed the preheated pellets into the indirect heating tank furnace 05 for composite roasting, the roasting temperature is controlled at 950-1050°C, and the roasting reaction time is 30-60 minutes.

[0047] 3) The calcined sand balls roasted by the pot furnace enter the water jacket cooling box 06 to cool down to less than 200°C, and then are discharged by the discharge machine 07, and are supplied to the subsequent beneficiation operation to select nickel concentrate.

[0048] The structure of the retort furnace 05 used in this embodiment is the same as that of the reto...

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Abstract

The invention discloses a roasting method for laterite-nickel ore pellets. The method comprises the steps that (1) during pellet preheating, the pellets are fed into preheating equipment for preheating, wherein the temperature of the pellets is lower than 400 DEG C after preheating; (2) during composite roasting with an indirect heating tank-type furnace, the preheated pellets are fed into the indirect heating tank-type furnace for composite roasting, wherein the roasting temperature is 900-1100 DEG C, and the roasting reaction time is 30-90min; and (3) during material discharge, high-temperature roasted pellets obtained through the tank-type furnace roasting are fed into a cooling tank with a water jacket under the tank-type furnace, then cooled till the temperature is lower than 200 DEGC and finally discharged from a discharging machine. The method disclosed by the invention has the beneficial effects that a pellet preheating-indirect heating roasting furnace composite roasting system is used, so a reaction atmosphere needed by composite roasting of laterite-nickel ore can be controlled effectively, residual heat is fully used, and a chlorinating agent is recycled. In this way,production cost can be reduced and the application prospect is broad.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for roasting laterite nickel ore pellets. Background technique [0002] At present, among many lateritic nickel ore treatment processes, the pyrotechnic process is dominant, and the rotary kiln pre-reduction-electric furnace smelting method (RKEF) has been successfully used in industrial production. Although there are cases of building factories using wet process, they face the dual pressure of cost and environmental protection due to various reasons. [0003] In recent years, with the deepening of research, the chlorination and segregation process has shown that it can effectively enrich nickel and cobalt in laterite nickel ore. This process is considered to be the most economical method for processing laterite nickel ore and has broad prospects. However, the roasting method using direct heating of materials has not been able to achieve the desired effect, resulting in the in...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B1/22
CPCC22B1/22C22B23/005Y02P10/20
Inventor 程建国解振朝赵欢李淮湘董英择廖乾
Owner CHANGSHA RES INST OF MINING & METALLURGY