Internal pre-reduction desulfurization device for rotary kiln during ferronickel smelting by virtue of RKEF process

A rotary kiln, ferronickel technology, applied in the field of gas purification equipment, can solve the problems of poor purification effect, cumbersome and troublesome purification treatment in the later stage, etc., and achieve the effect of reducing load, solving cumbersome and troublesome purification treatment, and novel design

Pending Publication Date: 2018-03-06
临沂鑫海新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of cumbersome and troublesome post-stage purification treatment and poor purification effect in the prior art, and provide a pre-reduction desulfurization device in the rotary kiln for smelting ferronickel by RKEF method to overcome the deficiencies of the prior art

Method used

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  • Internal pre-reduction desulfurization device for rotary kiln during ferronickel smelting by virtue of RKEF process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] refer to figure 1 , the present invention includes a block silo 3 with a gate valve at the bottom; a quantitative feeding conveyor belt 4 corresponding to the gate valve is provided below the block silo 3; the tail end of the quantitative feeding conveyor belt 4 is connected to the vertical mill The feed ports of the machine 8 correspond to each other; the discharge port of the vertical mill 8 communicates with the feed port on the top of the powder collector 6 through the material pipe 5; the bottom of the powder collector 6 is connected to the feed pipe 10 through the gate valve They are connected to each other, and the feeding pipe 10 is provided with a screw push rod connected to the motor 11; one side of the powder collector 6 is connected to the fan 7;

[0023] The feeding port 9 at the tail end of the feeding pipe 10 corresponds to the feeding port at the top of the finished product bin 12; the finished product bin 12 communicates with the feeding port of the qua...

Embodiment 2

[0027] A desulfurizer, which is prepared according to the following process:

[0028] 1) Crush wheat straw with a pulverizer, then add it to 2M sodium carbonate aqueous solution, soak for 10 hours, filter and air-dry to obtain component A;

[0029] 2) Add activated carbon, manganese acetate and ferric chloride to water at a mass ratio of 50:2:1, heat and stir in a magnetic stirrer until dry, then put it in a drying oven and dry at 80°C for 30 minutes to obtain Component B;

[0030] 3) Mix dolomite and kaolin at a mass ratio of 1:1, and then place them in a calcination furnace for 3 hours at a calcination temperature of 700°C, take them out, pulverize them, and cool to room temperature to obtain component C;

[0031] 4) Add calcium oxide, calcium fluoride and dicalcium silicate to the mixing mixer at a mass ratio of 3:2:2, stir at 600 rpm for 3 minutes, and spray polycarbonate accounting for one-tenth of the weight of silicon oxide while stirring. Methylsiloxane, after the st...

Embodiment 3

[0034] The effect test of the desulfurizer prepared by the embodiment of the present invention 2:

[0035] Take 10g of desulfurizer, place it in the reactor for experiment, simulate and detect sulfur-containing gas, the conditions are as follows: SO 2 And sulfur-containing gas composed of NOx is blown into the reaction system to control SO 2 The concentration is 18mg / m 3 , NOx concentration is 12mg / m 3 , the reaction space velocity (GHSV) is 80,000h -1 , The reaction time is 60min.

[0036] Set up four groups respectively: Example 2; Control group 1: No component A added; Control group 2: No component B added; Control group 3: No component C added.

[0037] The adsorption capacity of the adsorbent to harmful gases was detected (harmful gases / adsorbent=mg / g), and the results are shown in Table 1.

[0038] Table 1

[0039] group

[0040] Conclusion: As shown in the above Table 1, the desulfurization agent of the present invention has a good desulfurization effect, ...

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PUM

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Abstract

The invention discloses a pre-reduction desulfurization device in a rotary kiln for smelting ferronickel by the RKEF method, which comprises a block-shaped bin with a quantitative feeding conveyor belt below; The outlet of the vertical mill is connected with the inlet of the upper part of the powder collector; the bottom of the powder collector is connected with the feeding pipe; the outlet at the end of the feeding pipe corresponds to the inlet of the top of the finished product warehouse; It is connected with the feed port of the quantitative feeder; one end of the quantitative feeder is connected with the Roots blower, and the other end is connected with the material nozzle; the material nozzle is connected with the rotary kiln. The desulfurizer and reducing agent are ground and transported together and finally blown to the inside of the rotary kiln. They react while the burner sprays flames into the rotary kiln. Pre-reduction desulfurization is carried out in the environment of high temperature and water vapor, and desulfurization can be carried out in the kiln. treatment, which reduces the load of subsequent purification, and at the same time can significantly improve the purification effect, and the emission indicators have been qualitatively improved.

Description

technical field [0001] The invention belongs to the technical field of gas purification devices, and in particular relates to a pre-reduction desulfurization device in a rotary kiln for ferronickel smelting by using the RKEF method. Background technique [0002] At present, there are only two smelting processes for laterite nickel ore at home and abroad: pyrotechnics and wet smelting processes, of which there are mainly four pyrotechnic processes: sintering-blast furnace process (BF method), rotary kiln-electric furnace melting process (RKEF method) ; Dominican Eagle Bridge Shaft Furnace - Electric Furnace Technology; Japanese Oeyama Rotary Kiln Direct Reduction Method. Among them, the RKEF method is an advanced and mature technology for pyroprocessing laterite nickel ore, and is widely used. [0003] In the process of producing ferronickel by RKEF method, the sulfur content of the gas after the reaction of the material in the rotary kiln is high, and the post-stage purif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B1/11
CPCC22B23/023C22B23/005
Inventor 张书维刘晨刘洪松孙凤飞
Owner 临沂鑫海新型材料有限公司
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