A method for full utilization of blast furnace bag dust removal ash resources

A bag dust removal and recycling technology, which is applied in the field of waste resource utilization, can solve the problems such as being unsuitable for blast furnace bag dust removal and ash treatment, and achieve the effects of improving the recovery rate, improving the reduction rate, and increasing the contact area.

Active Publication Date: 2021-07-30
唐山顺浩环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes are not suitable for the current situation of the treatment of blast furnace bag dust in my country's iron and steel plants.

Method used

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  • A method for full utilization of blast furnace bag dust removal ash resources
  • A method for full utilization of blast furnace bag dust removal ash resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for the full utilization of blast furnace bag dust removal ash resources:

[0041] Step 1. Mix the collected blast furnace bag dust and reducing agent according to the mass ratio of 14:1, add to a ball mill and grind to a fineness of 180-220 μm to obtain a mixed powder;

[0042] Step 2. Mix the mixed powder, reducing agent and polyethylene powder according to the mass ratio of 14:1:0.3, stir for 30 minutes under the condition of 80r / min, add to the submerged arc furnace, heat and reduce at 1150°C, collect Volatilized smoke and slag, the collected smoke is used as crude zinc product; wherein, gas is introduced into the submerged arc furnace as reducing atmosphere, and the flow of gas is controlled to be 30m 3 / h;

[0043] Step 3: Grind the crude zinc product to a fineness of 90-110 μm, add it to a zinc sulfate solution with a concentration of 300 g / L, mix well, heat to 80° C., add dilute sulfuric acid to adjust the pH to 1.8, Stir for 50 minutes under the cond...

Embodiment 2

[0055] A method for the full utilization of blast furnace bag dust removal ash resources:

[0056] Step 1. Mix the collected blast furnace bag dust and reducing agent according to the mass ratio of 16:1, add to a ball mill and grind to a fineness of 180-220 μm to obtain a mixed powder;

[0057] Step 2. Mix the mixed powder, reducing agent and polyethylene powder according to the mass ratio of 15:1:0.2, stir for 60 minutes under the condition of 50r / min, add to the submerged arc furnace, heat and reduce at 1180°C, collect Volatilized smoke and slag, the collected smoke is used as crude zinc product; wherein, gas is introduced into the submerged arc furnace as a reducing atmosphere, and the flow of gas is controlled to be 50m 3 / h;

[0058] Step 3: Grind the crude zinc product to a fineness of 90-110 μm, add it to a zinc sulfate solution with a concentration of 310 g / L, mix well, heat to 70° C., add dilute sulfuric acid to adjust the pH to 1.5, Stir for 40 minutes under the co...

Embodiment 3

[0065] A method for the full utilization of blast furnace bag dust removal ash resources:

[0066] Step 1. Mix the collected blast furnace bag dust and reducing agent according to the mass ratio of 15:1, add to a ball mill and grind to a fineness of 180-220 μm to obtain a mixed powder;

[0067] Step 2. Mix the mixed powder, reducing agent and polyethylene powder according to the mass ratio of 16:1:0.5, stir for 45 minutes under the condition of 65r / min, add to the submerged arc furnace, heat and reduce at 1200°C, collect Volatile smoke and slag, the collected smoke is used as crude zinc product; wherein, gas is introduced into the submerged arc furnace as a reducing atmosphere, and the flow of gas is controlled to be 40m 3 / h;

[0068] Step 3: Grind the crude zinc product to a fineness of 90-110 μm, add it to a zinc sulfate solution with a concentration of 330 g / L, mix well, heat to 50° C., add dilute sulfuric acid to adjust the pH to 2, and set the temperature at 50 r Stir ...

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Abstract

The invention provides a method for full utilization of blast furnace bag dust removal ashes, which includes a process of heating and reducing volatilized crude zinc and a process of wet recovery of zinc. The recovery method recovers zinc and lead in crude zinc products, and finally makes the recovery rate of zinc reach 99.7%, and the recovery rate of lead reaches 99.2%. Separate the upper layer of slag from the remaining molten slag water after zinc volatilization, add gypsum powder and ceramic fiber to prepare calcium silicate board; the lower layer of molten slag water is molten iron, and the molten iron is purified to obtain iron products. The recovery rate of iron reaches 99.5%. The method for full utilization of blast furnace bag dust removal ash resources can maximize the reuse of blast furnace bag dust removal ash, realize full utilization of blast furnace bag dust removal ash resources, reduce environmental pollution caused by heavy metals, and produce no secondary in the whole process Secondary solid waste discharge.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for resource utilization of blast furnace bag dust removal ash. Background technique [0002] Blast furnace bag dust is dust collected from dry bag processing of blast furnace gas, and it is a high-temperature mixture of iron ore powder, coke, lime and other ironmaking furnace materials. Blast furnace bag dust contains a large amount of TFe, accounting for about 40-60%, and is rich in Zn, which is an important secondary resource containing a variety of metals. In order to effectively utilize its valuable elements, the current common practice is to directly use blast furnace bag dust as the raw material for sintering pellets, and directly enter the process of blast furnace ironmaking through simple pelletizing, and directly enter blast furnace smelting for secondary circulation without treatment Utilization, these elements, especially zinc and lead ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B5/10C22B5/16C22B19/04C22B19/20C22B19/30
CPCC22B5/10C22B5/16C22B7/001C22B7/006C22B7/02C22B19/04C22B19/20C22B19/30Y02P10/20
Inventor 王宝祥沈毅范囡柳
Owner 唐山顺浩环保科技有限公司
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