Method for combined processing of phosphogypsum and phosphate reverse flotation tailings

A combined processing and reverse flotation technology, applied in the field of flotation, can solve problems such as restricting the promotion of projects, and achieve the effect of increasing enterprise resource reserves, high rationality, and alleviating environmental protection and resource difficulties.

Active Publication Date: 2013-06-12
WENGFU (GRP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many plans for the utilization of phosphate rock reverse flotation tailings, such as road cushion, road subbase and drainage pipe trench backfill, production of glass-ceramics, cement production, production of phosphorus and magnesium fertilizers and magnesium salts, etc. Among them, the reverse flotation tailings of phosphate rock to produce magnesium salt is a relatively promising method, but there are certain economic problems at present, which limit the promotion of the project
[0005] Although there are many applications and researches on phosphogypsum and phosphate rock reverse flotation tailings in phosphate rock enterprises, the technical scheme of combining the two solid wastes for processing has not been reported yet

Method used

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  • Method for combined processing of phosphogypsum and phosphate reverse flotation tailings

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Embodiment 1

[0021] First, thermally decompose the phosphate rock reverse flotation tailings at 750°C until the decomposition rate of dolomite contained in the phosphorus rock reverse flotation tailings is 80%, collect the carbon dioxide in the gas phase, and then hydrate the obtained powder to powder The hydration rate of magnesium oxide in the material is 70%, and then the hydrated slurry is classified. The material with a large specific gravity is a phosphorus mineral raw material, and the material with a small specific gravity is collected in a carbonization tower at 65 ° C. Carry out carbonization in the material until the extraction rate of magnesium hydroxide in the material is 50%, then clarification, solid-liquid separation, the solid material is calcium carbonate, the liquid material is heavy magnesium water, and the phosphogypsum is pretreated and added to heavy magnesium water for metathesis reaction , the molar ratio of sulfate radicals in phosphogypsum to magnesium ions in hea...

Embodiment 2

[0025] First, thermally decompose the phosphate rock reverse flotation tailings at 950°C until the decomposition rate of dolomite contained in the phosphate rock reverse flotation tailings is 99%, collect carbon dioxide in the gas phase, and then hydrate the obtained powder to powder The hydration rate of magnesium oxide in the material is 99%, and then the hydrated slurry is classified, and the material with a large specific gravity is a phosphorus mineral raw material, and the material with a small specific gravity is collected in a carbonization tower at 10 ° C. Carry out carbonization in the material until the extraction rate of magnesium hydroxide in the material is 99%, then clarification, solid-liquid separation, the solid material is calcium carbonate, the liquid material is heavy magnesium water, and the phosphogypsum is pretreated and added to the heavy magnesium water for metathesis reaction , the molar ratio of sulfate radicals in phosphogypsum to magnesium ions in ...

Embodiment 3

[0029] First, thermally decompose the phosphate rock reverse flotation tailings at 850°C until the decomposition rate of dolomite contained in the phosphorus rock reverse flotation tailings is 80%, collect the carbon dioxide in the gas phase, and then hydrate the obtained powder to powder The hydration rate of magnesium oxide in the material is 70%, and then the hydrated slurry is classified, and the material with a large specific gravity is a phosphorus mineral raw material, and the material with a small specific gravity is collected in a carbonization tower at 55 ° C. Carry out carbonization in the material until the extraction rate of magnesium hydroxide in the material is 50%, then clarification, solid-liquid separation, the solid material is calcium carbonate, the liquid material is heavy magnesium water, and the phosphogypsum is pretreated and added to heavy magnesium water for metathesis reaction , the molar ratio of sulfate radicals in phosphogypsum to magnesium ions in...

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Abstract

The invention discloses a method for combined processing of phosphogypsum and phosphate reverse flotation tailings. The method comprises the following steps: phosphate reverse flotation tailings are thermally decomposed, and carbon dioxide in gas phase is collected; obtained powder is hydrated, and slurry obtained after hydration is graded, wherein material with large specific gravity is raw phosphate, and material with low specific gravity is carbonized with the carbon dioxide and then is clarified and subjected to solid-liquid separation to obtain solid material which is calcium carbonate and liquid material which is heavy-magnesium water; phosphogypsum is pretreated and then added to the heavy-magnesium water to be subjected to replacement reaction, generated carbon dioxide returns to a carbonizer, solid-liquid mixture is subjected to solid-liquid separation to obtain solid material which is calcium carbonate and liquid material which is magnesium sulphate solution; and the magnesium sulphate solution circularly enters the carbonizer to be circularly carbonized until the magnesium sulphate solution is saturated, and then magnesium sulfate heptahydrate crystals are obtained through crystallization. Through the method, the two industrial wastes are linked together for recycling, elements with high added values in the tailings and phosphogypsum are fully utilized, and autonomous cyclic utilization of resources is realized.

Description

technical field [0001] The invention relates to flotation, in particular to a combined processing method for reverse flotation tailings of phosphogypsum and phosphate rock. Background technique [0002] Phosphogypsum is a kind of solid waste produced in the production process of wet-process phosphoric acid. At present, the annual discharge of phosphogypsum in the world is more than 150 million tons, and the domestic annual discharge of phosphogypsum is close to 50 million tons. The stockpiling of phosphogypsum not only occupies a large amount of land, but also pollutes the surface (underground) water body, soil, vegetation, and atmospheric environment. With the increase in the output of high-concentration phosphorus compound fertilizers, the discharge of phosphogypsum in my country has increased significantly, and the pressure on environmental protection has increased. For this reason, domestic and foreign research institutes and phosphate compound fertilizer enterprises h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
Inventor 王景峰张勇胡宏
Owner WENGFU (GRP) CO LTD
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