A method for direct production of high-grade zinc oxide from zinc materials 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 not reaching the standard of high-grade zinc oxide, the quality of zinc oxide products cannot meet the standards, and the high production cost of products, so as to achieve good slagging performance and solid mass production. The effect of good mineral physical properties and low production cost

Active Publication Date: 2016-04-27
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

A method for directly producing high-grade zinc oxide from zinc materials containing high chlorine and fluorine, the steps are as follows: mixing and crushing zinc materials containing high chlorine and fluorine, furnace dust, and anthracite pulverized coal in a certain proportion, adding viscose Binder, mixed and rolled to form pellets; after the bottom carbon in the zinc-oxygen furnace is red hot, put the pellets that have been naturally air-dried for two days into the zinc-oxygen furnace, blow air, and release exhaust gas for 10 to 15 minutes. The air volume is controlled at 20%~30% of the total air volume; after closing the gate, increase the blast air volume entering the zinc-oxygen furnace, within half an hour, raise the furnace temperature of the zinc-oxygen furnace to above 1050°C, control the air volume, and make the aluminum pipe section furnace The gas temperature is 450-550°C, and the furnace gas temperature in the bag chamber section is 180-250°C; the smelting time is 1.5-2.5 hours. In the method of the invention, the method and scope of raw material selection are wider, the production cost is low, the metal recovery rate is high, and the obtained zinc oxide content reaches 98-99%.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a method for directly producing grade zinc oxide from zinc materials containing high chlorine and fluorine. Background technique [0002] Direct Zinc Oxide (ZnO) process: generally refers to using zinc concentrate as raw material, after roasting to remove lead, cadmium, arsenic, sulfur, etc., after converting zinc sulfide into zinc oxide, or directly using zinc slag, zinc ash, etc. Zinc waste is combined with appropriate anthracite and binder to form a ball, then reduced and evaporated in a zinc-oxygen furnace, and oxidized to produce pure zinc oxide. The main grade of zinc oxide in the direct method is generally between 80-99.5%, among which ZnO≥98% is high-grade zinc oxide. [0003] At present, the raw material for the preparation of high-grade zinc oxide (ZnO≥98%) by the direct method of zinc-oxygen furnace is mainly zinc calcine produced by high-quality zinc concentrate r...

Claims

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Application Information

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Patent Type & Authority Patents(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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