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Method for phosphogypsum harmless treatment and conversion into regeneration gypsum resource

A technology of harmless treatment and phosphogypsum, applied in the field of phosphogypsum treatment, can solve the problems of increasing production cost and one-time investment of production enterprises, high secondary pollution and pretreatment cost, affecting discharge and utilization, etc., and achieves low treatment cost. , the effect of protecting the environment and less investment

Active Publication Date: 2014-06-25
云南吉麟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main methods of pretreatment are: purification and washing, flash burning, lime neutralization and modification, etc., but due to the existence of many problems such as secondary pollution and high pretreatment costs, it seriously affects the system's non-toxic phosphogypsum. The discharge after hazardous treatment and the process of large-scale transformation into recycled gypsum resources and the process of full utilization
However, if the phosphogypsum discharged in the production process is completely harmless treated and recycled according to the existing technology and equipment, the production cost and one-time investment of the production enterprise will be greatly increased.
At present, there is no ammonium phosphate production enterprise in China that has achieved complete harmless treatment and discharge.

Method used

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  • Method for phosphogypsum harmless treatment and conversion into regeneration gypsum resource
  • Method for phosphogypsum harmless treatment and conversion into regeneration gypsum resource
  • Method for phosphogypsum harmless treatment and conversion into regeneration gypsum resource

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Configure phosphogypsum modifier, including a specific surface area of ​​500m 2 / kg of superfine cement clinker powder, the specific surface area is 500m 2 The calcium carbonate micropowder of / kg and the alum solution of 50% concentration; The quality of described alum solution accounts for 3% of phosphogypsum modifier; The mass ratio of described superfine cement clinker micropowder, calcium carbonate micropowder is 3: 7.

[0022] Install a special homogenizing mixer at the phosphogypsum discharge outlet. The special homogenizing agitator includes a cylinder body provided with a material inlet and a material outlet, a vibrating sleeve arranged in the cylinder body, a mixing mechanism arranged in the sleeve, and a mixing mechanism corresponding to the mixing mechanism. The connected drive mechanism, the electronic control device connected to this drive mechanism.

[0023] The phosphogypsum modifier and the freshly discharged original phosphogypsum are mixed in a mass...

Embodiment 2

[0040] Configure phosphogypsum modifier, including a specific surface area of ​​300m 2 / kg ultra-fine cement clinker powder, the specific surface area is 300m 2 The calcium carbonate micropowder of / kg and the alum solution of 50% concentration; The quality of described alum solution accounts for 5% of phosphogypsum modifier; The mass ratio of described ultrafine cement clinker micropowder, calcium carbonate micropowder is 1.

[0041] Install a special homogenizing mixer at the phosphogypsum discharge outlet. The special homogenizing agitator includes a cylinder body provided with a material inlet and a material outlet, a vibrating sleeve arranged in the cylinder body, a mixing mechanism arranged in the sleeve, and a mixing mechanism corresponding to the mixing mechanism. The connected drive mechanism, the electronic control device connected to this drive mechanism.

[0042] The phosphogypsum modifier and the freshly discharged original phosphogypsum are mixed in a mass rati...

Embodiment 3

[0045] Install a special homogenizing mixer at the phosphogypsum discharge outlet. The special homogenizing agitator includes a cylinder body provided with a material inlet and a material outlet, a vibrating sleeve arranged in the cylinder body, a mixing mechanism arranged in the sleeve, and a mixing mechanism corresponding to the mixing mechanism. The connected drive mechanism, the electronic control device connected to this drive mechanism.

[0046] Set the specific surface area to 400m 2 / kg ultra-fine cement clinker powder and freshly discharged original phosphogypsum are mixed in a mass ratio of 2:8, sent to a special homogenizer for homogenization and mixing, and then sent to a phosphogypsum slag yard for stacking after compression molding.

[0047] The performance indexes of the modified phosphogypsum are better than those of the original phosphogypsum, and it has reached the emission standard stipulated by the state.

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Abstract

The present invention discloses a method for a phosphogypsum harmless treatment and conversion into a regeneration gypsum resource, and belongs to phosphorus chemical industry solid waste treatments and inorganic non-metallic material industry. The method comprises the following steps: preparing a phosphogypsum modifier, wherein the phosphogypsum modifier is superfine cement clinker micro-powder with a specific surface area of more than or equal to 300 m<2> / kg; and mixing the phosphogypsum modifier and the justly-discharged phosphogypsum according to a mass ratio of 1:9-2:8, and carrying out homogenizing stirring through a special homogenizing stirrer, wherein the special homogenizing stirrer comprises a cylinder provided with a material inlet and a material outlet, a vibratable bush arranged inside the cylinder, a material mixing mechanism arranged inside the bush, and a drive mechanism connected with the material mixing mechanism.

Description

technical field [0001] The invention relates to a method for treating phosphogypsum, in particular to a method for harmless treatment and conversion of phosphogypsum into recycled gypsum resources. Background technique [0002] Phosphogypsum is a powdery solid industrial waste that is discharged in large quantities during the production of phosphate fertilizers and phosphoric acid in the phosphorus chemical industry. For every ton of phosphoric acid produced, 3 to 5 tons of phosphogypsum are produced. By 2007, my country's phosphate fertilizer production had ranked first in the world. At present, the total annual output of phosphate fertilizer in my country is about 15 million tons, and the annual discharge of phosphogypsum is as high as more than 60 million tons. [0003] The chemical composition of phosphogypsum is mainly calcium sulfate dihydrate. The impurities contained in it are mainly undecomposed phosphate rock, fluorine compounds, acid insoluble matter, carbonized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
Inventor 尚红彦杨林张高原
Owner 云南吉麟环保科技有限公司
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