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A kind of phosphogypsum utilization method

A technology of phosphogypsum and sodium phosphate, applied in the application, fertilization device, agriculture, etc., can solve the problems of secondary pollution and poor reliability, and achieve the effect of short production cycle, good environmental protection, and ensuring no secondary pollution.

Inactive Publication Date: 2016-06-15
DEYANG SANHUI SOLAR ENERGY POWER GENERATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods for extracting rare earth elements from phosphogypsum have effectively and rationally utilized phosphogypsum resources and avoided the waste of rare earth resources contained in phosphogypsum, these methods have secondary pollution to the environment in the extraction process of rare earth elements, and are reliable. poor sex

Method used

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  • A kind of phosphogypsum utilization method

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Comparison scheme
Effect test

Embodiment 1

[0024] see figure 1 , the present invention is a method for comprehensive utilization of rare earth-containing phosphogypsum. The facilities that need to be prepared are mainly: leaching tank, agitator (stirring rod or vibration stirring mechanism, etc.), solid-liquid separator (such as filter press, etc.), Liquid collection tank, storage tank, dehydrator, dryer, etc. The present invention specifically comprises the following steps:

[0025] 1). Put 1000L ammonium-containing solution in the leaching tank. The ammonium-containing solution is ammonium bicarbonate solution with an ammonium content of 2.5% (of course, in continuous operation, the ammonium-containing solution is preferably new ammonium bicarbonate solution and For the mixed solution of the supernatant recovered as follows, the ammonium content of the mixed solution is required to be 2.5%); add a little sodium silicate to the aforementioned ammonium-containing solution, and the amount added is 1:0.002 liquid-solid ...

Embodiment 2

[0031] see figure 1 , the present invention is a method for comprehensive utilization of rare earth-containing phosphogypsum. The facilities that need to be prepared are mainly: leaching tank, agitator (stirring rod or vibration stirring mechanism, etc.), solid-liquid separator (such as filter press, etc.), Liquid collection tank, storage tank, dehydrator, dryer, etc. The present invention specifically comprises the following steps:

[0032] 1). Put 1000L ammonium-containing solution in the leaching tank. The ammonium-containing solution is ammonium bicarbonate solution with an ammonium content of 3.5% (of course, in continuous operation, the ammonium-containing solution is preferably new ammonium bicarbonate solution and For the mixed solution of recovered supernatant as follows, the ammonium content of the mixed solution is required to be 3.5%); a little sodium silicate is added to the aforementioned ammonium-containing solution, and the amount added is a liquid-solid ratio...

Embodiment 3

[0038] see figure 1 , the present invention is a method for comprehensive utilization of rare earth-containing phosphogypsum. The facilities that need to be prepared are mainly: leaching tank, agitator (stirring rod or vibration stirring mechanism, etc.), solid-liquid separator (such as filter press, etc.), Liquid collection tank, storage tank, dehydrator, dryer, etc. The present invention specifically comprises the following steps:

[0039] 1). Put 1000L ammonium-containing solution in the leaching tank. The ammonium-containing solution is ammonium bicarbonate solution with an ammonium content of 4.5% (of course, in continuous operation, the ammonium-containing solution is preferably new ammonium bicarbonate solution and The mixed solution of the recovered supernatant mentioned below requires the ammonium content of the mixed solution to be 4.5%); a little sodium silicate is added to the aforementioned ammonium-containing solution, and the amount added is a liquid-solid rati...

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Abstract

A method for utilizing phosphogypsum, comprising: 1). Adding a little sodium silicate to the ammonium-containing solution, adjusting the pH value of the solution to 8-10 with sodium hydroxide; Add sodium phosphate; 2). Add phosphogypsum to the solution according to the liquid-solid ratio of 1:1-3; adjust the slurry; use dilute hydrochloric acid to adjust the pH value of the slurry to 3.5-5.5, and extract the rare earth elements; 3) .Separate the slurry from liquid to solid; use the residue for other purposes; add oxalic acid solution to the feed solution to make the pH of the feed solution 2 to 3.5, and let it stand to remove impurities; 4). Filter the feed liquid; use the filter residue for other purposes; Add ammonium bicarbonate solution to the filtrate to make the pH of the filtrate 7 to 7.5, and let it stand still; pour off the supernatant, and the precipitate enters the desalination process; 5). The precipitate is desalted and dried to obtain rare earth carbonate rich Collection. It is conducive to the realization of large-scale production, and the economic benefit is remarkable; it makes the phosphogypsum turn waste into wealth, make the best use of it, has no secondary pollution, and is environmentally friendly and reliable.

Description

technical field [0001] The invention relates to a utilization method of industrial waste residue phosphogypsum. Background technique [0002] Phosphogypsum is an industrial waste discharged from the phosphoric acid or phosphate fertilizer industry and some synthetic detergent industries. Usually, 1 ton of phosphoric acid will produce 4.8-5.0 tons of phosphogypsum. Therefore, with the rapid development of phosphoric acid and phosphate fertilizer industries, the output of phosphogypsum is astonishing. These mountains of phosphogypsum have seriously troubled the living environment of the surrounding residents, which is mainly reflected in the serious pollution of the surrounding atmosphere, water system, soil and other ecological environments by phosphogypsum, and prolonged exposure to phosphogypsum may cause human body to produce lesion. [0003] For a long time, people have wanted to use phosphogypsum rationally to turn waste into treasure and protect the ecological environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C05G1/00
CPCY02P10/20
Inventor 雷建
Owner DEYANG SANHUI SOLAR ENERGY POWER GENERATION EQUIP