Method for producing ammonium sulphate with phosphogypsum as raw material

A technology of phosphogypsum and ammonium sulfate, applied in chemical instruments and methods, calcium carbonate/strontium/barium, ammonia compounds, etc., can solve the problems of phosphogypsum waste residue accumulation and pollution, achieve low raw material cost, save sulfur resources, Effect of reducing environmental pollution

Active Publication Date: 2008-09-24
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a phosphogypsum waste slag storage and pollution problem that restricts the development of phosphorus chemical industry, realize the resource utilization of phosphogypsum, and produce sulfuric acid with phosphogypsum as raw material with low production cost and industrial production ammonium method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 1750g of crude phosphogypsum containing 20% ​​free water, add 35g of quicklime as an activator, mature for 8 days, and then put into a reaction tank and ammonium carbonate solution for conversion reaction. The concentration of the ammonium carbonate solution in the metathesis reaction process is 40%, the degree of carbonation CO 2 / 2NH 3 =1.34, the mass is 2000g. The reaction process consists of four reaction tanks, phosphogypsum is added from the first three tanks, and the fourth is a buffer tank. NH in the first three tanks of the reaction 3 Content control is 10g NH 3 / L, NH in the fourth reaction 3 Content control is 3g NH 3 / L. The reaction temperature was controlled to be 55° C., the stirring speed was 240 rpm, and the reaction time was 1.5 hours. After filtering, ammonium sulfate solution is obtained (the conversion rate of phosphogypsum is 98%, and the calcium carbonate obtained can be used for producing light calcium carbonate), and the ammonium sul...

Embodiment 2

[0021] Take 1750g of crude phosphogypsum containing 20% ​​free water, add 52.5g of activator slaked lime, and the aging time is 4 days. Then add the reaction tank and ammonium carbonate solution for conversion reaction. During the metathesis reaction, the concentration of the ammonium carbonate solution is 41%, and the carbonation degree CO 2 / 2NH 3 =1.36, the mass is 1920g. The reaction process consists of four reaction tanks, phosphogypsum is added from the first three tanks, and the fourth is a buffer tank. NH in the first three tanks of the reaction 3 Content control is 15g NH 3 / L, NH in the fourth reaction 3 Content control is 5g NH 3 / L. Control the reaction temperature to 65° C., the stirring speed to 220 rpm, and the reaction time to 2.0 hours. After filtering, ammonium sulfate solution is obtained (the conversion rate of phosphogypsum is 99%, and the calcium carbonate obtained can be used for producing light calcium carbonate), and the ammonium sulfate soluti...

Embodiment 3

[0023] Take 1750g of crude phosphogypsum containing 20% ​​of free water, add 70g of quicklime as an activator, and the aging time is 3 days. Then add the reaction tank and ammonium carbonate solution for conversion reaction. During the metathesis reaction, the concentration of the ammonium carbonate solution is 41.5%, and the degree of carbonization CO 2 / 2NH 3 =1.37, the mass is 1880g. The reaction process consists of four reaction tanks, phosphogypsum is added from the first three tanks, and the fourth is a buffer tank. NH in the first three tanks of the reaction 3 Content control is 20g NH 3 / L, NH in the fourth reaction 3 Content control is 7gNH 3 / L. The reaction temperature was controlled to be 65° C., the stirring speed was 230 rpm, and the reaction time was 2.0 hours. After filtering, ammonium sulfate solution is obtained (the conversion rate of phosphogypsum is 99.2%, and the calcium carbonate obtained can be used to produce light calcium carbonate), and the a...

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Abstract

The invention discloses a method using phosphogypsum as the raw material to produce ammonium sulfate, and the method comprises steps as follows: 1750 shares of crude phospho gypsum which contains 20 percent of free water is taken, and 2 to 5 percent of the amount of the crude phospho gypsum of activator is added the aging for 2 to 8 days; then, a reaction tank and an ammonium carbonate solution are added to carry out the conversion reaction, in the reaction process, the concentration of the ammonium carbonate solution is 40 to 42 percent, the carbonized ratio CO2/2NH3 is 1.34 to 1.37, the quality is 1840 to 2000g, the reaction temperature ranges from 55 to 70 DEG C, the stirring speed ranges from 200 to 240 turns per minute, and the reaction time ranges from 1.5 to 2.5 hours; after filtration, the ammonium sulfate solution is obtained, the ammonium sulfate solution is neutralized by sulfate to obtain a PH value ranging from 6.9 to 7.02, and then, an ammonium sulfate excellent grade product is obtained through multi-effect evaporation crystallization and drying. The method can solve problems of waste piling and pollution of phosphogypsum, which restrict the development of the phosphate chemical industry, and realize the resource utilization of the phosphogypsum.The production cost is low, and the industrial production can be realized.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing ammonium sulfate. Background technique [0002] Ammonium sulfate is widely used in agriculture, metallurgy, medicine, leather, wood preservation, textile, electroplating and other industries, and can also be used as a fermentation medium in biopharmaceuticals. It is used as an acidic fertilizer in agriculture, used for general crops, and can be used as top dressing, base fertilizer, and seed fertilizer. Although ammonium sulfate has a low nitrogen content (21% nitrogen content), it has great advantages in agriculture due to its high nitrogen utilization rate and the medium nutrient sulfur required for crop growth. At present, from the world In terms of scope, in addition to the necessary nitrogen, phosphorus, and potassium for plant growth, sulfur is also very important. In my country's soil, the lack of sulfur has caused the nutrient degradation of many cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/244C01F11/18
Inventor 杨三可胡宏解田王景峰张群杨丽萍柳玉松陈立平
Owner WENGFU (GRP) CO LTD
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