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Method for preparing secondary zinc oxide from oxygen pressure leached zinc smelting solid waste residues

An oxygen pressure leaching and secondary zinc oxide technology is applied in the field of oxygen pressure leaching zinc smelting solid waste treatment and oxygen pressure leaching zinc smelting solid waste comprehensive recovery, which can solve the problem that the furnace temperature is difficult to maintain, energy consumption is high, and valuable metals are difficult to recover. Use and other problems to achieve the effect of avoiding serious corrosion of furnace bricks, reducing service life and long service life

Inactive Publication Date: 2020-05-08
WESTERN MINING CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent CN102321806A discloses a smelting method for treating zinc leaching slag with an oxygen-enriched side-blown furnace. This method uses an oxygen-enriched side-blown furnace to realize the solid waste treatment produced by conventional wet zinc smelting, but due to the The content of elemental sulfur in solid waste is high, and it is difficult to realize the treatment of solid waste residue of zinc smelting by oxygen pressure leaching and the comprehensive recovery of valuable metals by this method
Moreover, there are problems in the treatment of zinc smelting solid waste slag by oxygen pressure leaching by conventional wet zinc smelting methods: it is difficult to maintain the temperature of the furnace body, it is difficult to enrich valuable metals in solid waste slag, etc.
In addition, the use of rotary kiln to process oxygen pressure leaching zinc smelting solid waste has disadvantages such as high energy consumption, difficulty in recycling valuable metals, low concentration of sulfur dioxide in the generated flue gas and cannot produce acid, and it is difficult to meet environmental protection requirements if a desulfurization device is used.

Method used

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  • Method for preparing secondary zinc oxide from oxygen pressure leached zinc smelting solid waste residues
  • Method for preparing secondary zinc oxide from oxygen pressure leached zinc smelting solid waste residues
  • Method for preparing secondary zinc oxide from oxygen pressure leached zinc smelting solid waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, 287t of zinc smelting solid waste tailings slag was put into oxygen pressure leaching, and its content was: 4% for Zn, 13% for Cu0., 26% for Fe, 0.8% for Pb, and 14% for S. Add 17t of quartz stone, 17t of limestone, and 57t of reduced coal. Follow the steps below,

[0020] 1) Drying the zinc smelting solid waste leached by oxygen pressure leaching to a moisture content of less than 15% by weight, and then using a granulator to granulate, with a particle size of 10-15mm;

[0021] 2), the solid waste residue completed in step 1) is mixed with quartz stone, limestone, reduced coal, etc., wherein the amount of solid waste residue: the amount of quartz stone: the amount of limestone: the amount of reduced coal is 1:0.059:0.059:0.2;

[0022] 3) Transport the prepared materials in step 2) to the oxygen-enriched side-blowing furnace. The smoke generated during the smelting process enters the bag for dust collection, and returns this part of the smoke to the oxygen-e...

Embodiment 2

[0025] Example 2, 310t of molten sulfur filter residue from zinc smelting smelting by oxygen pressure leaching was put in, the content of which was: 8% Zn, 0.13% Cu, 6% Fe, 0.6% Pb, and 53% S. Add 17.9t of quartz stone, 12.4t of limestone, and 42t of reduced coal. Follow the steps below,

[0026] 1) Drying the zinc smelting solid waste leached by oxygen pressure leaching to a moisture content of less than 15% by weight, and then using a granulator to granulate, with a particle size of 10-15mm;

[0027] 2), the solid waste residue completed in step 1) is mixed with quartz stone, limestone, reduced coal, etc., wherein the amount of solid waste residue: the amount of quartz stone: the amount of limestone: the amount of reduced coal is 1:0.057:0.04:0.135;

[0028] 3) Transport the prepared materials in step 2) to the oxygen-enriched side-blowing furnace. The smoke generated during the smelting process enters the bag for dust collection, and returns this part of the smoke to the o...

Embodiment 3

[0031] Embodiment 3, input oxygen pressure leaching zinc smelting solid waste purification copper cadmium slag 320t, its content is: Zn is 16.2%, Cu is 9.3%, Fe is 0.56%, Pb is 1.2%, S is 0.54%. Because the copper cadmium slag contains less Fe and S, it is necessary to add pyrite to ensure the slag type of the smelting furnace. Add 24t of quartz stone, 20.8t of limestone, 49.6t of reduced coal, and 100t of pyrite, and proceed as follows,

[0032] 1) Drying the zinc smelting solid waste leached by oxygen pressure leaching to a moisture content of less than 15% by weight, and then using a granulator to granulate, with a particle size of 10-15mm;

[0033]2), the solid waste residue completed in step 1) is mixed with quartz stone, limestone, reduced coal, etc., wherein the amount of solid waste residue: the amount of quartz stone: the amount of limestone: the amount of reduced coal is 1:0.075:0.065:0.155;

[0034] 3) Transport the prepared materials in step 2) to the oxygen-enric...

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Abstract

The invention discloses a method for preparing secondary zinc oxide from oxygen pressure leached zinc smelting solid waste residues. The method comprises the following steps that oxygen pressure leached zinc smelting solid waste residues are dried until the water content is 15% or below, and the solid waste residues are granulated by using a granulator; the solid waste residues are mixed with limestone, quartz stone and reducing coal, and are sent to an oxygen-enriched side-blown furnace; oxygen-enriched air is blown into a furnace during smelting, and chemical reactions such as sulfur makingand slagging are completed; sulfur in the slag generates SO2, and the SO2 enters an acid making system through a flue gas pipeline to produce industrial sulfuric acid; the molten slag is blown by a fuming furnace, secondary zinc oxide products are produced from smoke dust, and the fuming furnace slag is subjected to innocent treatment. According to the method, the problems that the smelting solidwaste produced in the zinc-oxygen pressure leaching process is difficult to stack and transport, valuable metal in the leaching residues cannot be recycled and the like are solved, and harmless treatment of the zinc-oxygen pressure leaching smelting solid waste is achieved. The method has the advantages that valuable metals such as lead, zinc, indium, germanium and silver can be recovered, industrial-grade secondary zinc oxide products can be prepared, the technological process is simple, the recovery rate of the valuable metals is high, and the energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery of zinc smelting solid waste by oxygen pressure leaching, in particular to a method for preparing secondary zinc oxide from zinc smelting solid waste by oxygen pressure leaching, and belongs to the technical field of oxygen pressure leaching zinc smelting solid waste treatment. Background technique [0002] A large amount of solid waste is produced during the oxygen pressure leaching zinc smelting process, mainly including purification slag, sulfur flotation tailings slag, and molten sulfur filter slag. This kind of slag belongs to the national hazardous waste, and the waste category is HW48 non-ferrous metal smelting waste. The amount of smelting solid waste generated by oxygen pressure leaching zinc smelting is about 62%-75% of the output of zinc ingots. The amount of smelting solid waste generated is very large. Such slag storage warehouses need to be treated with "three defenses"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/34C22B7/00
CPCC22B7/001C22B19/34Y02P10/20
Inventor 秦海斌李耀山张春发刘远杨文栋王训青孔德鸿李金琼马元虎张志明
Owner WESTERN MINING CO LTD
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