Method for treating cold-state lead-rich slag with hot slag side-blowing reduction furnace

A technology of enriching lead slag and reducing furnace, which is applied in the field of pyrometallurgy, can solve the problems of waste of resources, poor comprehensive utilization of heat energy, weak continuity of production process, etc., and achieve the effect of stable operation, low cost and low energy consumption

Active Publication Date: 2015-07-29
YUNNAN CHIHONG ZINC & GERMANIUM
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Problems solved by technology

Cold lead-rich slag is often used as raw material for blast furnaces. The disadvantages are that lead-rich slag is produced by oxidative smelting, the continuity of the production process is weak, and the comprehensive utilization of heat energy is poor, which is not conducive to energy saving and emission reduction. With increasing attention, the blast furnace lead smelting process has been banned as a phase-out process
In the lead smelting process of oxygen-enriched top-blown or side-blown reduction furnace and oxygen-enriched bottom-blown reduction furnace for lead smelting, due to production failures, maintenance operations and other reasons, there will always be a part of cold lead-rich slag. Heat is absorbed during the melting process, which affects the stability of the reduction furnace, thereby limiting the treatment of cold lead-rich slag. On the one hand, long-term storage causes waste of resources, affects the comprehensive recovery of valuable metals, and increases the burden of on-site warehouse storage. There is no introduction to the process of treating cold lead-rich slag with lead smelting reduction furnace at home and abroad

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  • Method for treating cold-state lead-rich slag with hot slag side-blowing reduction furnace

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Embodiment 1

[0020] A method for processing cold lead-rich slag with a hot slag side-blown reduction furnace, comprising the following steps:

[0021] 1) Put 70t of hot lead-rich slag into the reduction furnace, and at the same time, add cold lead-rich slag at 3t / h, limestone at 1.5t / h, iron calcine at 3t / h, coke 2t / h, and crushed coal at 0.8t / h h, through the DCS control system into the hot slag side-blown reduction furnace;

[0022] 2) During the process of adding the hot lead-rich slag, the level of the lead liquid at the siphon mouth is continuously rising, and after reaching the flow height of the lead liquid at the siphon mouth, put lead from the siphon mouth, and put the lead liquid into the rough lead ingot casting machine to cast ingots ;

[0023] 3) The total amount of cold lead-rich slag added to each furnace is 3t, limestone 2.2t, iron calcine 3t, coke 2t, crushed coal 2.5t; gas flow control 3200-3600Nm 3 / h, the oxygen flow rate is controlled at 950~1200Nm 3 / h, the molten ...

Embodiment 2

[0027] A method for processing cold lead-rich slag with a hot slag side-blown reduction furnace, comprising the following steps:

[0028] 1) Put 80t of hot lead-rich slag into the reduction furnace, and at the same time add 4.5t / h of cold lead-rich slag, 2t / h of limestone, 3.5t / h of iron calcine, 2.5t / h of coke, and 1.2 tons of crushed coal t / h, cold state lead-rich slag, limestone, iron calcined sand, and coke must be added within 0.5 to 1.5 hours after the hot state lead-rich slag is fed, and crushed coal should be added continuously from the time the hot slag is fed to the slag is discharged , into the hot slag side-blown reduction furnace through the DCS control system; the carbon content of the crushed coal is between 50-70%, and the calorific value is 18900-27300kJ·kg -1 between;

[0029] 2) During the process of adding the hot lead-rich slag, the level of the lead liquid at the siphon mouth is continuously rising, and after reaching the flow height of the lead liquid a...

Embodiment 3

[0034] 1) Add 90t of hot lead-rich slag into the reduction furnace, and at the same time, add cold lead-rich slag at 6t / h, limestone at 2.5t / h, iron calcine at 4t / h, coke 3t / h, and crushed coal at 1.6t / h h, cold state lead-rich slag, limestone, iron calcined sand, and coke must be added within 0.5 to 1.5 hours after the hot state lead-rich slag is fed, and the crushed coal should be added continuously from the time the hot slag is fed to the slagging period. Add hot slag side-blowing reduction furnace through DCS control system; the carbon content of crushed coal is between 50-70%, and the calorific value is 18900-27300kJ·kg -1 between;

[0035] 2) During the process of adding the hot lead-rich slag, the level of the lead liquid at the siphon mouth is continuously rising, and after reaching the flow height of the lead liquid at the siphon mouth, put lead from the siphon mouth, and put the lead liquid into the rough lead ingot casting machine to cast ingots ;

[0036] 3) The ...

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Abstract

The invention relates to a method for treating cold-state lead-rich slag with a hot slag side-blowing reduction furnace, and belongs to the technical field of thermometallurgy. The method comprises the following steps: (1) adding 70-90 t of hot-state lead-rich slag, 3-6 t/h of cold-state lead-rich slag, 1.5-2.5 t/h of limestone, 3-4 h/t of iron calcine, 2-3 t/h of coke nut and 0.8-1.6 t/h of crushed coal; (2) after a siphon mouth lead liquid level rises to the lead liquid flowing height in a lead-rich slag adding process, carrying out lead tapping and ingotting; (3) adding 3-10 t of zinc calcine, 2.2-3.5 t of limestone, 3-6 t of iron calcine, 2-3.5 t of coke nut, and 2.5-4 t of crushed coal into each furnace, and controlling the gas flux, oxygen flux, molten pool temperature and in-furnace negative pressure within 3200 to 3600 Nm<3>/h, 950 to 1200 Nm<3>/h, 1100 to 1300 DEG C and -20 to -40 pa respectively; (4) after the lead-rich slag adding process is finished, continuously adding crushed coal at 1000-1250 DEG C for 1-2 hours' smelting, observing the lead content of molten slag with a slag detection bar till the lead content is lower than or equal to 2.2%, and then carrying out 0.5 hour's heating for slag tapping; (5) conducting waste heat recovery and dust collection on flue gas in a smelting process, and then sending the treated flue gas into a desulphuration system. The method is simple in technology and has the advantages that the conventional technology is sufficiently utilized, the defect in stockpiling of the cold-state lead-rich slag is effectively overcome, the recovery rate of valuable metal is improved, and the like.

Description

technical field [0001] The invention relates to a method for treating cold lead-rich slag with a hot slag side-blown reduction furnace, belonging to the technical field of pyrometallurgy. Background technique [0002] Cold lead-rich slag is the cold slag obtained by cooling the high-lead hot slag produced during the smelting and oxidation process of lead sulfide concentrate, generally containing 40-55% lead, mainly produced by oxygen-enriched top-blown furnace or oxygen-enriched bottom furnace. Furnace output. Cold lead-rich slag is often used as raw material for blast furnaces. The disadvantages are that lead-rich slag is produced by oxidation smelting, the continuity of the production process is weak, and the comprehensive utilization of heat energy is poor, which is not conducive to energy saving and emission reduction. With increasing attention, the blast furnace lead smelting process has been banned as an eliminated process. In the lead smelting process of oxygen-enri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/02
Inventor 保自坤蒋荣生俞兵杨伟张云良张成江孙祖禄肖毕高赵常青彭云红赵华勇邓志敏李红权耿力
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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