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Comprehensive recycling technology for iron removal slag and blast furnace soot produced in zinc smelting process adopting high acid leaching wet method

A technology for blast furnace soot and hydrometallurgy zinc smelting, which is applied in the fields of process efficiency improvement, chemical instruments and methods, solid separation, etc., can solve the problems of loss of valuable metal resources, hidden dangers of environmental impact, and increased storage costs, and achieves pollution reduction. hidden dangers, comprehensive utilization, and the effect of saving carbon distribution

Inactive Publication Date: 2014-03-12
马永涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term storage of iron removal slag and blast furnace soot not only causes the loss of valuable metal resources, increases storage costs, but also poses hidden dangers to the environment

Method used

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  • Comprehensive recycling technology for iron removal slag and blast furnace soot produced in zinc smelting process adopting high acid leaching wet method
  • Comprehensive recycling technology for iron removal slag and blast furnace soot produced in zinc smelting process adopting high acid leaching wet method

Examples

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Effect test

Embodiment 1

[0028] Embodiment 1: see figure 1 , a high-acid leaching process for the comprehensive recycling of iron slag and blast furnace soot from wet zinc smelting, which includes the following steps:

[0029] (1) Preparation of raw materials: prepare mixed raw materials in proportions by weight of 20 parts of iron slag, 8 parts of sulfur concentrate, and 40 parts of blast furnace soot;

[0030] (2) Magnetization roasting: Send the mixed raw materials into the hopper of the magnetized roasting fluidized furnace through the conveyor belt and roast to obtain slag; control the feeding speed to add the mixed raw materials into the magnetized roasted fluidized furnace at a uniform speed, and the roasting temperature is about 800-900 ° C. The wind linear velocity is 0.3-0.6m / s, the air excess coefficient is -2-5%, and the sulfur dioxide concentration in the roasting flue gas is 8-10%. The roasting flue gas is sent to the acid system for acid production after the waste heat recovery of the w...

Embodiment 2

[0032] Example 2: see figure 1 , a high-acid leaching process for the comprehensive recycling of iron slag and blast furnace soot from wet zinc smelting, which includes the following steps:

[0033] (1) Preparation of raw materials: prepare mixed raw materials in proportions by weight of 23 parts of goethite slag, 11 parts of sulfur concentrate, 23 parts of blast furnace soot, 1 part of coke, and 1.5 parts of coal;

[0034] (2) Magnetization roasting: Send the mixed raw materials into the hopper of the magnetized roasting fluidized furnace through the conveyor belt and roast to obtain slag; control the feeding speed to add the mixed raw materials into the magnetized roasted fluidized furnace at a uniform speed, and the roasting temperature is about 800-900 ° C. The wind linear velocity is 0.3-0.6m / s, the air excess coefficient is -2-5%, and the sulfur dioxide concentration in the roasting flue gas is 8-10%. The roasting flue gas is sent to the acid system for acid production a...

Embodiment 3

[0036] Embodiment 3: see figure 2 , a high-acid leaching process for the comprehensive recycling of iron slag and blast furnace soot from wet zinc smelting, which includes the following steps:

[0037] (1) Preparation of raw materials: prepare mixed raw materials in proportions by weight of 26 parts of hematite slag, 10 parts of sulfur concentrate, and 33 parts of blast furnace soot;

[0038] (2) Magnetization roasting: Send the mixed raw materials into the hopper of the magnetized roasting fluidized furnace through the conveyor belt and roast to obtain slag; control the feeding speed to add the mixed raw materials into the magnetized roasted fluidized furnace at a uniform speed, and the roasting temperature is about 800-900 ° C. The wind linear velocity is 0.3-0.6m / s, the air excess coefficient is -2-5%, and the sulfur dioxide concentration in the roasting flue gas is 8-10%. The roasting flue gas is sent to the acid system for acid production after the waste heat recovery of...

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Abstract

The invention discloses a comprehensive recycling technology for iron removal slag and blast furnace soot produced in the zinc smelting process adopting the high acid leaching wet method. The comprehensive recycling technology mainly comprises the processing steps of raw material preparation, magnetic roasting and magnetic separation of cinder; specifically, the iron removal slag, sulfur ore concentrate, blast furnace soot and solid fuel are mixed according to proportion to realize the step of mixed raw material preparation; the mixed raw material is fed into a magnetic roasting fluidized bed roaster for magnetic roasting so as to obtain cinder, smoke dust is recovered through waste heat of a waste heat boiler, and the smoke dust is delivered to an acid making system for acid making after being recovered, so that the step of the acid making is realized; the cinder is mixed with the smoke dust for magnetic separation after being levigated to obtain iron ore concentrate and magnetic separation tailings, and the magnetic separation tailings are used as the raw material from which the valuable metals, such as zinc and indium, are extracted, so that the step of magnetic separation of cinder is realized. The technology has the advantages that the problems influencing heat balance and oxygen balance of iron removal slag boiling-bed roasting, and the availability of roasting smoke are skillfully solved, the domestic and foreign common problems about pile-up of iron removal slag and blast furnace soot are solved, the pollution hazards are reduced, and the valuable element in the iron removal slag and blast furnace soot can be comprehensively utilized.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and in particular relates to a comprehensive recovery and utilization process of high-acid leaching wet zinc smelting iron slag and blast furnace soot. Background technique [0002] At present, most zinc smelting enterprises adopt roasting-high acid leaching-purification-electrowinning zinc smelting process. In this method, the leaching rate of zinc is low due to the formation of zinc ferrite which is insoluble in sulfuric acid and remains in the leaching slag, and leads to a decrease in the total recovery rate of zinc. At the same time, a large amount of iron dissolved in the leaching solution is not conducive to zinc electrodeposition. Therefore, the zinc hydrometallurgy process includes iron removal process steps. The iron removal methods mainly include jarosite iron removal, goethite iron removal and hematite iron removal. The slag produced by the three iron removal proces...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/10B03C1/015
CPCY02P10/20
Inventor 马永涛
Owner 马永涛
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