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Method for preparing soil conditioner for passivating soil heavy metals by taking phosphogypsum as raw material

A technology of soil conditioner and phosphogypsum, which is applied in the direction of soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of low resource utilization rate of phosphogypsum, heavy burden of solid waste treatment, etc., and achieve the passivation performance of heavy metals , reduce production burden, improve the effect of conditioning performance

Pending Publication Date: 2021-12-31
GUIZHOU RES INST OF CHEM IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen that when phosphogypsum is used as a raw material in the prior art to prepare a soil conditioner for passivating heavy metals, the resource utilization rate of phosphogypsum is low, resulting in a heavy burden of solid waste treatment for phosphorus chemical enterprises, making it difficult for phosphogypsum to passivate heavy metals. Heavy metal soil conditioners have been promoted and used in resource industrialization

Method used

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  • Method for preparing soil conditioner for passivating soil heavy metals by taking phosphogypsum as raw material
  • Method for preparing soil conditioner for passivating soil heavy metals by taking phosphogypsum as raw material

Examples

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Effect test

Embodiment 1

[0025] Such as figure 2 Shown, the soil conditioner preparation process of passivating soil heavy metals, the preparation steps are as follows:

[0026] Preparation of modifier: Calcining phosphogypsum at a temperature of 300°C for 30 minutes under a nitrogen atmosphere, then spraying water while stirring at a stirring speed of 200r / min, the amount of water sprayed accounted for 5% of the mass of phosphogypsum, and sent it into a ball mill Ball milling and passing through a 100-mesh sieve;

[0027] Soil conditioner preparation: take phosphogypsum, grind it with water according to the liquid-solid mass ratio of 5:1, filter it with a 300-mesh screen, return the sieve material (filter residue) and mix it with phosphogypsum to obtain the filtrate (serum); Add nanometer calcium sulfate as crystallization agent and modifying agent, the liquid-solid mass ratio between filtrate and crystallization agent, modifying agent is 100:0.1:5, with 1000r / min stirring speed stirring treatment ...

Embodiment 2

[0029] When preparing the soil conditioner, phosphogypsum and water are mixed and ground according to the liquid-solid mass ratio of 3:1; the liquid-solid mass ratio between the filtrate and the crystallization agent and modifier is mixed at 100:0.4:8, and other treatments refer to the examples 1 for processing and preparation.

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Abstract

The invention relates to the technical field of solid waste resource utilization, and in particular, relates to a method for preparing a soil conditioner for passivating soil heavy metals by taking phosphogypsum as a raw material, wherein the method comprises the steps: adding water into phosphogypsum, grinding and filtering to prepare filtrate (slurry), adding a crystallizing agent and a modifier, stirring and mixing, standing and filtering, returning waste liquid to grind phosphogypsum, and drying solid to constant weight, to obtain the soil conditioner. Waste liquid discharge is avoided, meanwhile, the utilization rate of the phosphogypsum is increased, absorption of the phosphogypsum is accelerated favourably, the production burden of phosphorus chemical enterprises is reduced, and the obtained soil conditioner has the performance of passivating heavy metal in soil and reduces the risk of heavy metal remigration.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a method for preparing a soil conditioner for passivating soil heavy metals by using phosphogypsum as a raw material. Background technique [0002] Phosphogypsum is the industrial waste discharged from the wet-process phosphoric acid process. Generally, every ton of wet-process phosphoric acid (in P 2 o 5 In total), 4 to 4.5 tons of phosphogypsum will be produced. The stockpiling of a large amount of phosphogypsum not only easily leads to environmental pollution and waste of land resources, but also makes it difficult for phosphogypsum to be utilized as a resource, resulting in a heavy burden on phosphorus chemical enterprises and poor economic benefits. [0003] At present, the comprehensive utilization of phosphogypsum resources has been preliminarily studied, and corresponding results have been achieved, making phosphogypsum widely used in buildin...

Claims

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Application Information

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IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 王瑶陈思帆司孝刚王文章彭星运田光雨丁蕾
Owner GUIZHOU RES INST OF CHEM IND
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