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Method for smelting crude lead in oxygen-enriched side-blowing smelting furnace

A molten pool smelting and crude lead technology, which is applied in the field of lead smelting, can solve the problems of serious pollution, huge investment, and complicated operation, and achieve the effects of reducing pollution, less investment, and streamlining the process flow

Inactive Publication Date: 2012-11-14
杨龙安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned processes have the disadvantages of complex operation, huge investment, high energy consumption and serious pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Example 1: A method for smelting lead in an oxygen-enriched side-blown molten pool, comprising the following steps.

[0028] Lead concentrate smelting. According to the percentage by weight, 70% of lead mineral material (lead-containing concentrate), 8% of soot, 5% of limestone, 8% of quartz stone, and 9% of fine slag are fully mechanically stirred and mixed evenly, and directly from the The feed inlet is put into the furnace, the air pressure is controlled to be 0.5Mpa-0.8Mpa, and the air volume is 25-30m 3 / min, oxygen enrichment 25-45%, pulverized coal 4-6.8kg / m 2 Min, the melt is sprayed into the melt by the spray gun to vigorously stir the melt, the mass transfer and heat transfer quickly carry out chemical reactions, and lead matte is produced. The temperature is controlled at 900-1170°C, and the quartz sand accounts for 4% of the total weight of the lead matte and quartz stone. ~12%. Carry out continuous and uninterrupted operation of smelting, according to th...

example 2

[0031] Example 2: A method for smelting rough lead in an oxygen-enriched side-blown molten pool, comprising the following steps.

[0032] Lead concentrate smelting. According to the weight ratio, 75% of lead concentrate, 10% of fine slag, 6% of lead fume, 4% of limestone, and 5% of quartz stone are fully mechanically stirred, mixed evenly, and directly put into the furnace from the feed port through the material conveyor belt. cavity. The control wind pressure is 0.6~1Mpa, and the air volume is 30~35m 3 / min, 35-50% oxygen-enriched air, 4-5.2kg / m pulverized coal 3 h, Sprayed into the furnace melt by the spray gun, the melt is violently stirred and tumbling, quickly realizes mass and heat transfer, completes various chemical reactions, and forms a lead metal liquid in the smelting process, with a content of 65% to 85% or more , control the temperature at 1000-1250°C, carry out uninterrupted continuous smelting operation, timely monitor the lead matte and slag content accordi...

example 3

[0035] Example 3: A method for smelting rough lead in an oxygen-enriched side-blown molten pool, comprising the following steps.

[0036] Lead concentrate smelting. According to the weight percentage, mix 80% lead concentrate, 4% fine slag, 2% lead fume, 7% limestone, and 7% quartz stone, and fully mechanically mix them evenly, and put them into the furnace directly from the feed port through the material conveyor belt. Inside, the control wind pressure is 0.6~1.2MpQ, and the air volume is 30~40m 3 / h, 30-60% oxygen-enriched air, 5-5.5kg / m pulverized coal 2 h, the spray gun is input into the furnace, and the melt is violently stirred and tumbled, and the mass transfer, heat transfer and chemical reaction are carried out quickly to form a molten lead metal liquid with a content of more than 65%. For continuous smelting operation, timely monitor the content of lead matte and lead slag according to the operating procedures, and release the slag at an appropriate time (about 4 hou...

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PUM

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Abstract

The invention relates to a method for smelting crude lead in an oxygen-enriched side-blowing smelting furnace, belonging to the technical field of lead smelting. The method comprises the process steps of: 1) crude lead material preparation: proportioning lead-containing materials, quartz stones and limestone flux according to silicate degree being 0.9-1.3 percent, evenly mixing and crushing the lead-containing materials and the flux to grain size being less than or equal to 40mm; 2) crude lead smelting preparation: melting partial crude lead materials to a depth of 300-400mm in the oxygen-enriched side-blowing smelting furnace; and 3) crude lead smelting: continuously feeding the crude lead materials into a hearth and then controlling smelting air-coal ratio, temperature and high-pressure oxygen-enriched air supply, wherein molten lead sinks down and automatically flows into a furnace bed for heat preservation and storage through a siphon port, the molten lead automatically flows into a casting mold to form ingots when the depth of the stored molten lead reaches an overflow port, and the accumulated floating lean slag is discharged and is introduced into the crude lead material preparation process. The method for smelting crude lead in the oxygen-enriched side-blowing smelting furnace has the advantages that the investment is small, the smelting efficiency is high, the energy consumption is low, the arrangement is facilitated, the treatment capacity is high, the method is suitable for mass production, the materials are not required to be granulated, bricked, dried and stored, and the quantity of flue dust is small.

Description

technical field [0001] The invention relates to a crude lead smelting method in an oxygen-enriched side-blown molten pool, which belongs to the technical field of lead smelting. Background technique [0002] At present, the main processes of domestic crude lead production are: flash smelting plus converter blowing, top-blown bath smelting plus converter blowing; closed blast furnace smelting plus converter blowing or top-blown smelting or blast furnace smelting, etc. Some of the smelting methods are foreign patents, and some are referenced and improved domestically. They have been adopted by various types of domestic lead smelting enterprises for a long time, but they all have their own deficiencies. Collectively, the deficiencies can be divided into two categories: the first category is foreign The scale of the smelting process is huge, the process is complicated, the operation is difficult, and the investment is huge. The second category is the domestic introduction of imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02
CPCY02P10/20
Inventor 杨龙安
Owner 杨龙安
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