Blast furnace zinc ash recovery and purification process for preparing zinc carbonate

A zinc carbonate and blast furnace technology, applied in zinc compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of waste of resources, low recovery efficiency of zinc oxide, low processing efficiency of zinc carbonate, etc. The effect of cleaner production requirements and low cost of raw materials

Pending Publication Date: 2021-10-19
常州市武进康佳化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Blast furnace zinc soot will be produced during the processing and production of zinc carbonate. Blast furnace zinc soot contains more zinc oxide and a small amount of silicon, manganese, arsenic, lead and other elements, while the processing efficiency of zinc carbonate is low, and the zinc in blast furnace zinc soot Oxide recovery efficiency is low, which is easy to cause waste of resources

Method used

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  • Blast furnace zinc ash recovery and purification process for preparing zinc carbonate
  • Blast furnace zinc ash recovery and purification process for preparing zinc carbonate

Examples

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Effect test

Embodiment 1

[0032] The invention provides a process for recovering and purifying blast furnace zinc soot for preparing zinc carbonate, comprising the following steps:

[0033] Step 1: Primary Leaching

[0034] Lead the blast furnace zinc soot in the zinc carbonate preparation furnace into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for leaching, keep the temperature of the leaching solution at 40°C during the leaching process, control the pH value at the end point to 5.0, and filter after the leaching is completed to obtain Primary leachate and primary leach residue;

[0035] Step 2: Secondary Leaching

[0036] Put the primary leaching residue in step 1 into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for the second stirring leaching, keep the temperature of the leaching solution at 55°C during the leaching process, control the end point pH value to 3.8, and leaching After completion, filter to...

Embodiment 2

[0053] A process for recovering and purifying blast furnace zinc soot for preparing zinc carbonate, comprising the following steps:

[0054] Step 1: Primary Leaching

[0055] Lead the blast furnace zinc soot in the zinc carbonate preparation furnace into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for leaching, keep the temperature of the leaching solution at 45°C during the leaching process, control the pH value at the end point to 5.3, and filter after the leaching is completed to obtain Primary leachate and primary leach residue;

[0056] Step 2: Secondary Leaching

[0057] Put the primary leaching residue in step 1 into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for the second stirring leaching, keep the temperature of the leaching solution at 55°C during the leaching process, control the end point pH value to 4.2, and leaching After completion, filter to obtain secondary leach...

Embodiment 3

[0074] A process for recovering and purifying blast furnace zinc soot for preparing zinc carbonate, comprising the following steps:

[0075] Step 1: Primary Leaching

[0076] Lead the blast furnace zinc soot in the zinc carbonate preparation furnace into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for leaching, keep the temperature of the leaching solution at 50°C during the leaching process, control the pH value at the end point to 5.6, and filter after the leaching is completed to obtain Primary leachate and primary leach residue;

[0077] Step 2: Secondary Leaching

[0078] Put the primary leaching residue in step 1 into the leaching tank, add dilute sulfuric acid leaching agent into the leaching tank and stir for the second stirring leaching, keep the temperature of the leaching solution at 60°C during the leaching process, control the end point pH value to 4.5, and leaching After completion, filter to obtain secondary leach...

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Abstract

The invention discloses a blast furnace zinc ash recovery and purification process for preparing zinc carbonate. The process comprises the following steps: 1, first-stage leaching; 2, second-stage leaching; 3, third-stage leaching; 4, oxidative hydrolysis; and 5, zinc carbonate preparation. According to the invention, blast furnace zinc ash is leached in a three-stage leaching mode, wherein neutral leaching is adopted during first-stage leaching, acid leaching is adopted during second-stage leaching, concentrated sulfuric acid high-temperature leaching is adopted during third-stage leaching, and the blast furnace zinc ash is leached through the third-stage leaching, so that the leaching rate of zinc oxide reaches up to 98%, and the recovery efficiency of the zinc oxide can be effectively improved; by using three leaching modes including neutral leaching, acid leaching and concentrated sulfuric acid high-temperature leaching, the zinc oxide is oxidized, hydrolyzed and processed into basic zinc carbonate after leaching, so that the zinc oxide in the blast furnace zinc ash can be recycled, and the extraction efficiency of the zinc carbonate can be improved.

Description

technical field [0001] The invention relates to the technical field of recovery of blast furnace zinc soot, in particular to a recovery and purification process of blast furnace zinc soot for preparing zinc carbonate. Background technique [0002] Zinc carbonate is an inorganic salt, white fine amorphous powder, odorless and tasteless. Zinc carbonate is soluble in dilute acid and sodium hydroxide, slightly soluble in ammonia, insoluble in water and alcohol, and can be used as skin protectant, zinc supplement in feed, light astringent, etc. [0003] Blast furnace zinc soot will be produced during the processing and production of zinc carbonate. Blast furnace zinc soot contains more zinc oxide and a small amount of silicon, manganese, arsenic, lead and other elements, while the processing efficiency of zinc carbonate is low, and the zinc in blast furnace zinc soot Oxygen recovery efficiency is low, which is easy to cause waste of resources. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/00
CPCC01G9/00
Inventor 王明刚俞如英
Owner 常州市武进康佳化工有限公司
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