Flotation method for waste residue of phosphate gypsum

A phosphogypsum and waste residue technology is applied in the field of positive flotation of calcium sulfate dihydrate to achieve the effects of reducing impurity content, reducing pollution and facilitating large-scale industrial production

Inactive Publication Date: 2012-01-18
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of flotation to treat phosphogypsum residue has not been reported yet

Method used

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  • Flotation method for waste residue of phosphate gypsum
  • Flotation method for waste residue of phosphate gypsum
  • Flotation method for waste residue of phosphate gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1, a flotation method of phosphogypsum waste residue, the steps are as follows: add water to the phosphogypsum waste residue, control the mass concentration of the pulp at 15%, and perform flotation in a flotation machine; flotation adopts 2 times of roughing and 1 beneficiation operation; add inhibitor 1.5kg / t phosphogypsum waste residue, collector 100g / t phosphogypsum waste residue for rough separation Ⅰ operation, and then carry out another roughing operation, and add collector 50g / t phosphogypsum waste residue in each roughing operation; the roughing tank is tailings; after merging roughing foam products, add inhibitor 0.1kg / t The phosphogypsum waste slag is selected for one time; the selected foam is high-quality phosphogypsum for flotation concentrate, and the product in the selected tank is returned to roughing as middle ore Ⅰ operation; the inhibitor is water glass; the collector is acetate or hydrochloride of alkyl fatty amine with 8 to 18 carbon ato...

Embodiment 2

[0014] Embodiment 2, a flotation method of phosphogypsum waste residue, the steps are as follows: add water to the phosphogypsum waste residue, control the mass concentration of the pulp at 30%, and perform flotation in a flotation machine; flotation adopts 5 times of roughing and 2 beneficiation operations; add inhibitor 3.5kg / t phosphogypsum waste residue, collector 300g / t phosphogypsum waste residue for rough separation Ⅰ operation, and then 4 times of roughing operations, and each roughing operation is added with collector 150g / t phosphogypsum waste residue; the roughing tank is tailings; after merging roughing foam products, add inhibitor 1kg / t phosphorus The gypsum waste residue is selected twice; the selected foam is flotation concentrate high-quality phosphogypsum, and the product in the selected tank is returned to roughing as middle ore Ⅰ operation; the inhibitor is water glass; the collector is acetate or hydrochloride of alkyl fatty amine with 8 to 18 carbon atoms....

Embodiment 3

[0015] Embodiment 3, a flotation method of phosphogypsum waste residue, the steps are as follows: add water to the phosphogypsum waste residue, control the mass concentration of the pulp at 22%, and perform flotation in a flotation machine; flotation adopts 3 times of roughing and one beneficiation operation; add inhibitor 2.5kg / t phosphogypsum waste residue, collector 200g / t phosphogypsum waste residue for rough separation Ⅰ operation, and then carry out 2 roughing operations, and add collector 100g / t phosphogypsum waste residue in each roughing operation; the roughing tank is tailings; after merging roughing foam products, add inhibitor 0.5kg / t The phosphogypsum waste slag is selected for one time; the selected foam is high-quality phosphogypsum for flotation concentrate, and the product in the selected tank is returned to roughing as middle ore Ⅰ operation; the inhibitor is water glass; the collector is acetate or hydrochloride of alkyl fatty amine with 8 to 18 carbon atoms...

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Abstract

The invention relates to a flotation method for waste residue of phosphate gypsum. The method is characterized by comprising the following steps of: adding water into the waste residue of the phosphate gypsum; controlling the mass concentration of ore pulp and performing flotation in a flotation machine, wherein flotation adopts 2 to 5 times of rough flotation and 1 to 2 times of fine flotation; adding a retardant and a collecting agent to perform first time rough flotation; performing 1 to 4 times of rough flotation, wherein the collecting agent is added during each time of rough flotation; and combining a rough flotation foam product, and adding the retardant to perform 1 to 2 times of fine flotation, wherein fine flotation foam is high-quality phosphate gypsum of flotation concentrate, a product in a fine flotation groove is used as middling ore to be returned for the first time of rough flotation, the retardant is water glass, and the collecting agent is acetate or hydrochloride of alkyl fatty amine with carbon atomic number of between 8 and 18. By the flotation method, any treatment on the waste residue of the phosphate gypsum is not required, and the water is only required to be added for size mixing; and by soluble P2O5 impurity (residual phosphorus) in the phosphate gypsum and an appropriate flotation agent, the impurity content of the phosphate gypsum can be obviously reduced, and the recycling of the waste residue of the phosphate gypsum is realized.

Description

technical field [0001] The invention relates to a method for positive flotation of calcium sulfate dihydrate from phosphogypsum waste residue. Background technique [0002] Phosphogypsum refers to the solid waste generated when sulfuric acid is used to treat phosphate rock in the production of phosphoric acid, and its main component is calcium sulfate dihydrate. In the production process of phosphoric acid, some phosphate rocks are not decomposed, the washing and filtering process of phosphogypsum is not complete, and the additives in the production process are the reasons why phosphogypsum contains various impurities such as phosphorus and fluorine. It is these impurities that affect the performance of phosphogypsum , so that it cannot be directly applied to the production of gypsum building materials, which restricts the use of phosphogypsum. [0003] Phosphogypsum impurities are divided into two categories: insoluble impurities: such as quartz, undecomposed apatite, inso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/08
Inventor 杨勇朱孔金单连勇
Owner BLUESTAR LEHIGH ENG INST CO LTD
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