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Method for direct production of high-grade zinc oxide from zinc material containing high chlorine and fluorine

A direct method, zinc oxide technology, applied in the direction of improving process efficiency, etc., can solve the problems of high production cost, failure to meet the standard of high-grade zinc oxide, and zinc oxide product quality can not meet the standard, so as to achieve low production cost and high manufacturing efficiency. Good performance of slag and good physical performance of agglomerates

Active Publication Date: 2014-06-04
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses zinc-containing dust to recover zinc oxide, but the zinc oxide content of the prepared zinc oxide product is about 70%, which cannot reach the standard of high-grade zinc oxide
[0009] The existing direct method of producing high-grade zinc oxide has the following problems: the selection of zinc slag, zinc ash and other high-chlorine and fluorine-containing zinc materials as raw materials is limited or it is necessary to add a dechlorination treatment process for raw materials, or the production cost of the product High, or the quality of zinc oxide products cannot meet the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The steps of this embodiment are as follows:

[0034] 1) The raw material composed of high chlorine and fluorine-containing zinc material and furnace ash is mixed with fuel anthracite pulverized coal at a weight ratio of 100:34:75, crushed, added with binder, mixed and rolled to form balls Group; Make the zinc content of the pellets be 32%, and the carbon content be 35%;

[0035] 2) After the bottom charcoal in the zinc-oxygen furnace is red hot, put the pellets in step 1) which has been naturally air-dried for two days into the zinc-oxygen furnace, blow air and release exhaust gas for 10 minutes, and the air volume is controlled at 20% of the total air volume , so that harmful metals such as lead and cadmium and low melting point substances enter the exhaust gas powder;

[0036] 3) After closing the gate, the blast air volume entering the zinc-oxygen furnace increases from small to large. Within half an hour, the furnace temperature of the zinc-oxygen furnace is raise...

Embodiment 2

[0040] The steps of this embodiment are as follows:

[0041] 1) The raw material composed of high chlorine and fluorine-containing zinc material and furnace ash is mixed with fuel anthracite pulverized coal at a weight ratio of 100:27:81, crushed, added with binder, mixed and rolled to form balls Group; Make the zinc content of the pellets be 33.5%, and the carbon content be 34%;

[0042]2) After the bottom charcoal in the zinc-oxygen furnace is red hot, put the pellets in step 1) which has been naturally air-dried for two days into the zinc-oxygen furnace, blow air and release exhaust gas for 12 minutes, and the air volume is controlled at 20% of the total air volume , so that harmful metals such as lead and cadmium and low melting point substances enter the exhaust gas powder;

[0043] 3) After closing the gate, the blast air volume entering the zinc-oxygen furnace increases from small to large, and the furnace temperature of the zinc-oxygen furnace is raised to 1200±20°C w...

Embodiment 3

[0047] The steps of this embodiment are as follows:

[0048] 1) The raw material composed of high chlorine and fluorine-containing zinc material and furnace ash is mixed with fuel anthracite pulverized coal at a weight ratio of 100:18:95, crushed, added with binder, mixed and rolled to form balls Group; Make the zinc content of the pellets be 38%, and the carbon content be 30%;

[0049] 2) After the bottom charcoal in the zinc-oxygen furnace is red hot, put the pellets in step 1) that have been air-dried for two days into the zinc-oxygen furnace, blow air, and release exhaust gas for 15 minutes, and the air volume is controlled at 25% of the total air volume. , so that harmful metals such as lead and cadmium and low melting point substances enter the exhaust gas powder;

[0050] 3) After closing the gate, the blast air volume entering the zinc-oxygen furnace increases from small to large, and the furnace temperature of the zinc-oxygen furnace is raised to 1300±20°C within hal...

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Abstract

The invention discloses a method for direct production of high-grade zinc oxide from a zinc material containing high chlorine and fluorine. The method comprises the following steps of 1, mixing the zinc material containing high chlorine and fluorine, furnace surface ash and smokeless pulverized coal according to a certain ratio, carrying out crushing, adding a binder into the crushed materials, carrying out mixing, and carrying out rolling to obtain balls, 2, after bed coke in a zinc oxidation furnace is red and hot, putting the balls naturally air-dried for two days into the zinc oxidation furnace, carrying out blasting, and discharging waste gas for 10-15min, wherein a blast volume is controlled in 20-30% the total air volume, and 3, after switching out, increasing a blast volume into the zinc oxidation furnace, heating the zinc oxidation furnace to a temperature above 1050 DEG C in 0.5h, controlling an exhaust volume so that an aluminum pipe section furnace gas temperature is in a range of 450-550 DEG C and a bag chamber section furnace gas temperature is in a range of 180-250 DEG C, and carrying out smelting for 1.5-2.5h. The method has wide raw material selection approach and range, a low production cost and a high metal recovery rate and realizes zinc oxide content of 98-99%.

Description

Technical field [0001] The present invention involves a zinc oxide production method, especially a method for producing rated zinc oxide in the direct method of chlorine -containing zinc materials. Background technique [0002] Direct zinc oxide (ZNO) process: Generally refers to zinc concentrate as raw materials, and after baking and dehydration, cadmium, arsenic, sulfur, etc., after the zinc sulfide is transformed into zinc oxide, or zinc residue, zinc ash, etc.Zinc wastes are pressed with appropriate smoke -free coal and adhesives, reducing evaporation in the zinc oxygen furnace, and oxidized to generate pure zinc oxide.Direct method of zinc oxide is generally between 80-99.5%, of which Zno ≥98%is a high-grade zinc oxide. [0003] At present, the use of zinc oxygen furnaces to directly prepare high -grade zinc oxide (ZNO ≥98%) raw materials, mainly zinc roasting sand produced by high -quality zinc concentrates through boiling furnaces.Due to the tight high -quality zinc concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/34
CPCY02P10/20
Inventor 李斌罗明成李东旭凌晗李军辉张西平
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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