Method for pretreating phosphogypsum by using steel slag

A phosphogypsum and pretreatment technology, which is applied in the field of industrial waste resource treatment, can solve the problems of incomplete industrial production, environmental pollution, and increased costs, and achieves good impurity removal and whitening effects, less environmental and human damage, and easy operation. low cost effect

Inactive Publication Date: 2021-01-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Phosphogypsum is the solid waste produced in the production process of wet phosphoric acid. In the traditional pretreatment stage of phosphogypsum, there are water washing method, lime neutralization method, ball milling method, flotation, calcination and other pretreatment processes. These pretreatment stages do not need to add a large amount of The water that needs to be manually operated will cause problems such as environmental pollution, inability to complete industrial production, and increased costs.

Method used

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  • Method for pretreating phosphogypsum by using steel slag
  • Method for pretreating phosphogypsum by using steel slag
  • Method for pretreating phosphogypsum by using steel slag

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: a kind of method utilizing steel slag pretreatment phosphogypsum, comprises the following steps:

[0021] Step 1: Mix steel slag and water, stir evenly, collect steel slag leaching solution after filtration for use; wherein water and steel slag are mixed in a mass ratio of 1:2.2;

[0022] Step 2: Take the phosphogypsum raw material, sieve it with a sieve with a filter hole of 0.20 mm, collect the sieved phosphogypsum, and age it for 24 hours for use;

[0023] Step 3: washing the phosphogypsum obtained in step 2 with a sulfuric acid solution with a mass fraction of 30%, and collecting the phosphogypsum filter residue after filtering;

[0024] Step 4: Fully mix the phosphogypsum filter residue obtained in Step 3 and the steel slag filtrate collected in Step 1 at a mass ratio of 1:0.429;

[0025] Step 5: fully stir the mixed material obtained in step 4, and measure the pH until the pH value of the material is in the range of 7-9;

[0026] Step 6: wash the m...

Embodiment 2

[0032] Embodiment 2: a kind of method utilizing steel slag pretreatment phosphogypsum, comprises the following steps:

[0033] Step 1: Mix steel slag and water, stir evenly, collect steel slag leaching solution after filtration for use; wherein water and steel slag are mixed in a mass ratio of 1:2.2;

[0034] Step 2: Take the phosphogypsum raw material, sieve it with a sieve with a filter hole of 0.20 mm, collect the sieved phosphogypsum, and age it for 24 hours for use;

[0035] Step 3: washing the phosphogypsum obtained in step 2 with a sulfuric acid solution with a mass fraction of 28%, and collecting the phosphogypsum filter residue after filtering;

[0036] Step 4: Fully mix the phosphogypsum filter residue obtained in Step 3 and the steel slag filtrate collected in Step 1 at a mass ratio of 1:0.429;

[0037] Step 5: fully stir the mixed material obtained in step 4, and measure the pH until the pH value of the material is in the range of 7-9;

[0038] Step 6: Wash the m...

Embodiment 3

[0044] Embodiment 3: a kind of method utilizing steel slag pretreatment phosphogypsum, comprises the following steps:

[0045] Step 1: Mix the steel slag and water, stir evenly, collect the steel slag leach solution after filtration for use; wherein water and steel slag are mixed in a mass ratio of 1:2;

[0046] Step 2: Take the phosphogypsum raw material, sieve it through a sieve with a filter hole of 0.20 mm, collect the sieved phosphogypsum, and age it for 30 hours for use;

[0047] Step 3: washing the phosphogypsum obtained in step 2 with a sulfuric acid solution with a mass fraction of 28%, and collecting the phosphogypsum filter residue after filtering;

[0048] Step 4: Fully mix the phosphogypsum filter residue obtained in Step 3 and the steel slag filtrate collected in Step 1 according to the mass ratio of 1:0.428;

[0049] Step 5: fully stir the mixed material obtained in step 4, and measure the pH until the pH value of the material is in the range of 7-9;

[0050] ...

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Abstract

The invention discloses a method for pretreating phosphogypsum by using steel slag. According to the invention, the method opens up a new way for comprehensive utilization of ardealite waste residuesand steel slag waste materials, and is simple in operation process, low in operation cost and good in impurity removal and whitening effect; less water is used, and less harm is caused to the environment and human bodies; the steel slag waste is fully utilized, and the purpose of solid waste utilization is achieved. Specifically, active lime in steel slag is used for neutralizing the acidity of phosphogypsum to reduce the content of compounds such as P, F and the like in the phosphogypsum, sulfuric acid pickling is conducted to remove compounds of impurities such as soluble silicon, aluminum,iron, fluorine, potassium and the like contained in the phosphogypsum, the two components are mixed according to a set proportion to completely sink the phosphogypsum filter residues into steel slag filtrate, and further drying and dehydrating are performed in an oven to remove a small amount of organic impurities in the phosphogypsum so as to obtain the semi-hydrated phosphogypsum which is relatively pure and relatively high in whiteness.

Description

technical field [0001] The invention relates to a method for pretreating phosphogypsum with steel slag, and belongs to the technical field of industrial waste resource treatment. Background technique [0002] Phosphogypsum is the solid waste produced in the production process of wet phosphoric acid. In the traditional pretreatment stage of phosphogypsum, there are water washing method, lime neutralization method, ball milling method, flotation, calcination and other pretreatment processes. These pretreatment stages do not need to add a large amount of The lack of water requires manual operation, resulting in environmental pollution, inability to complete industrial production, and increased costs. The present invention reduces the amount of water used in the process of pretreating phosphogypsum with steel slag, and reduces the harm to the environment and human body caused by waste water treated with phosphogypsum; the use of steel slag waste reduces the labor cost of manual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
CPCC04B11/26
Inventor 王存赵志曼全思臣吴磊刘卓李丹
Owner KUNMING UNIV OF SCI & TECH
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