A method for treating lead oxide concentrate with an oxygen-enriched top-blown furnace
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A lead oxide concentrate and oxygen-enriched top-blowing technology is applied in the field of pyrometallurgy, which can solve the problems of large hidden dangers in environmental protection and high energy consumption, and achieve the effects of promoting development, low energy consumption, and alleviating the shortage of raw materials.
Active Publication Date: 2015-10-07
YUNNAN CHIHONG ZINC & GERMANIUM
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The traditional blast furnace is mainly used for reduction smelting in the pyrotechnics of lead oxide concentrate, which is characterized by high energy consumption and great environmental protection hazards, and has been listed as a backward and eliminated process
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Embodiment 1
[0020] Example 1 : Taking the processing of 50 tons of lead oxide concentrate raw materials as an example, its composition is shown in Table 1.
[0021] Table 1 Composition of lead oxide concentrate (%)
[0022] name Pb SiO 2 S Zn Ag (g / t) Cd As Lead Oxide Concentrate 65 14 1.5 0.12 50 0.03 0.04
[0023] 1) Set 5t / h of lead oxide concentrate, 8t / h of lead sulfide concentrate, 18t / h of soot and lead concentrate mixture, and 1.2t / h of raw coal on the DCS, and continuously add oxygen-enriched top blowing after mixing and granulating Melting in the furnace.
[0024] 2) Strictly control the air volume at 2.5-4.5 Nm during the smelting process 3 / s, the enriched oxygen concentration is controlled within the range of 25-35%.
[0025] 3) Smelting at 700-850°C for 2 hours to decompose lead carbonate, lead oxide and lead sulfide to interact with each other, then raise the temperature to 900-1050°C for 3 hours, and adjust the amount of materia...
Embodiment 2
[0033] Example 2 : Taking the processing of 80 tons of lead oxide concentrate raw materials as an example, its composition is shown in Table 3.
[0034] Table 3 Composition of lead oxide concentrate (%)
[0035] name Pb SiO 2 S Zn Ag (g / t) Cd As Lead Oxide Concentrate 68 16 2.3 0.08 30 0.02 0.05
[0036] 1) Set 6t / h of lead oxide concentrate, 10t / h of lead sulfide concentrate, 16 t / h of soot and lead sulfide concentrate mixture, and 1.5t / h of raw coal on the DCS, and add oxygen-enriched top continuously after mixing and granulating Melting in a blowing furnace.
[0037] 2) Strictly control the air volume at 2.5-4.5 Nm during the smelting process 3 / s, the enriched oxygen concentration is controlled within the range of 25-35%.
[0038] 3) Smelting at a temperature of 700-850°C for 2 hours to decompose lead carbonate, lead oxide and lead sulfide to interact with each other, then raise the temperature to 900-1050°C for another 2.5 ho...
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Abstract
The invention relates to a method for processing lead oxide ore concentrate by using a rich oxygen top-blowing furnace, and belongs to the technical field of thermometallurgy. The method comprises the following steps: 1) burdening lead oxide ore concentrate, lead sulfide ore concentrate, smoke dust and raw coal according to a certain ratio, and continuously adding to the inside of a rich oxygen top-blowing furnace to smelt; 2) controlling the furnace atmosphere and the temperature of a molten bath by adjusting the oxygen-enriched air, the enriched oxygen concentration and the coal supply amount, and continuously smelting the lead oxide ore concentrate; 3) smelting at the temperature of 700-850 DEG C for 1-2 hours, finishing lead carbonate decomposition and interaction of lead oxide and lead sulfide, heating to 900-1050 DEG C and then smelting for 2-3 hours, so as to obtain metal lead; 4) reducing the coal quantity to 0.5-0.8t / h, carrying out clarifying treatment for 0.5-1 hour, stopping coal feeding, discharging the lead-enriched slag from a slag hole, continuing to smelt for 0.5-1.5 hours and then discharging crude lead from a lead outlet, and feeding the smoke to prepare an aid after waste heat recovery and dust collection. The method has the characteristics of being simple in process, low in production cost, good in environment-friendly effect, and the like, and continuously treatment can be carried out.
Description
technical field [0001] The invention relates to a method for treating lead oxide concentrate with an oxygen-enriched top-blown furnace, belonging to the technical field of pyrometallurgy. Background technique [0002] The main raw material of the domestic direct lead smelting process is lead sulfide concentrate. In recent years, facing the severe situation of shortage of lead sulfide concentrate raw materials and difficulty in procurement, the development of direct lead smelting process is in a passive situation. It is particularly important to broaden the types of raw materials and purchase channels. [0003] The main phase of lead oxide concentrate is PbCO 3 , containing 55%-70% lead, 0.05-2% zinc, 10-100g / t silver, 10%-18% silicon, 1%-3% sulfur, 0.02%-0.05% cadmium, and 0.04%-0.08% arsenic. Lead oxide concentrate contains high lead grade, low content of impurity elements such as cadmium and arsenic, and low purchase price, which is of great economic value. The tradition...
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