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Method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings

A technology of gypsum whisker and magnesium ammonium phosphate is applied in the field of magnesium ammonium phosphate and magnesium chloride, the resource utilization of phosphorus tailings, magnesium chloride, and the preparation of gypsum whiskers, which can solve the problem that the poor quality of phosphogypsum cannot be utilized and the utilization of phosphorus tailings is difficult. and other problems, to achieve the effect of high added value, good product quality and convenient recycling

Active Publication Date: 2020-02-21
三峡公共检验检测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of difficult utilization of phosphorus tailings and poor quality of phosphogypsum, the present invention provides a technology for producing gypsum whiskers, magnesium chloride, magnesium ammonium phosphate and ammonium chloride from phosphorus tailings

Method used

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  • Method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings
  • Method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings
  • Method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] XRF elemental analysis results of flotation phosphorous tailings of a company in Hubei

[0024]

[0025] Turn on the agitator, add 100g of tailings in batches to 255mL of acidizing solution (2.50mol / L HCl) at a rotating speed of 250r / min, raise the temperature to 60°C, and add 245mL of industrial hydrochloric acid (9.65 mol / LHCl), after the dropwise addition, react at this temperature for 30 minutes, and filter while hot to obtain 7.40g of silicon slag and acidolysis solution, wash with 50mL gypsum washing water for 3 times, and the first washing liquid is incorporated into the acidolysis solution 500 mL of acid solution was obtained. The second wash was used for the first wash of the next experiment, and the third wash was used for the second wash of the next experiment. The acidolysis solution was cooled, and 1.7g of calcium chlorophosphate was precipitated, and the acidolysis solution was used to produce gypsum whiskers.

[0026] Carefully add 25.5mL of concentr...

Embodiment 2

[0032] XRF elemental analysis results of flotation phosphorous tailings of a company in Hubei

[0033]

[0034]Turn on the agitator, add 200g of tailings in batches to 510mL of acidizing solution (2.50mol / L HCl) at a speed of 300r / min, raise the temperature to 60°C, and add 490mL of industrial hydrochloric acid (9.65 mol / L HCl), after the dropwise addition, react at this temperature for 30 minutes, and filter while hot to obtain 15.0 g of silicon slag and acid hydrolysis solution, wash 3 times with 100 mL of gypsum washing water, and add the acid solution to the first washing The solution was acid solution 1000mL. The second wash was used for the first wash of the next experiment, and the third wash was used for the second wash of the next experiment. The acid hydrolysis solution was cooled, and 3.6g of calcium chlorophosphate was precipitated, and the acid hydrolysis solution was used to produce gypsum whiskers.

[0035] Carefully add 51mL concentrated sulfuric acid (98%...

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Abstract

The invention provides a method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings. The method comprises the following steps:adding an acidizing fluid into phosphate tailings in batches, dropwise adding hydrochloric acid to react, separating silicon slag and an acidolysis solution, and cooling and crystallizing the acidolysis solution to obtain calcium chlorophosphate and acidolysis solution; adding concentrated sulfuric acid into the acidizing fluid, dropwise adding the acidolysis fluid for reaction, and performing centrifugal separation after reaction to obtain gypsum whiskers and the acidizing fluid; heating and concentrating the acidizing fluid, crystallizing to obtain a magnesium chloride solution, and centrifugally separating the magnesium chloride solution to obtain magnesium chloride hexahydrate and a magnesium chloride mother liquor; adding ammonium sulfate and calcium chlorophosphate into the magnesium chloride mother liquor for reaction, filtering to obtain gypsum and a filtrate after the reaction is finished, dropwise adding ammonia water into the filtrate, cooling and filtering to obtain ammonium magnesium phosphate and an ammonium chloride solution; heating, concentrating, and cooling the ammonium chloride solution to obtain ammonium chloride crystals and a crystallization mother liquor, and after centrifugal separation, preparing a 5 to 20% ammonia water solution from the crystallization mother liquor and ammonia water. According to the technical scheme, the recovery rate of phosphorus reaches 99%, and the recovery rate of calcium reaches 95%.

Description

technical field [0001] The invention relates to resource utilization of phosphorous tailings, in particular to a process for coordinating processes and formulas, and preparing gypsum whiskers, magnesium chloride, magnesium ammonium phosphate and magnesium chloride from phosphorous tailings, and belongs to the technical field of chemical industry. Background technique [0002] Phosphorus tailings refer to the tailings slag left after the phosphorous concentrate is obtained from low- and medium-grade collophosphine through flotation. Due to the poor endowment of phosphate rock resources in my country and high impurity content, only through ore dressing and enrichment can the production needs of phosphoric acid and high-concentration phosphorus compound fertilizer be met. However, a large amount of phosphorus tailings are produced in the process of flotation enrichment of phosphorus concentrate. At present, collophosite, which can be processed and utilized by flotation in my c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C01B25/45C01C1/16C22B7/00C22B26/20C30B7/14C30B29/46C30B29/62
CPCC01B25/451C01C1/164C01F5/30C22B7/006C22B26/20C30B7/14C30B29/46C30B29/62Y02P10/20
Inventor 潘志权余学军潘洁张华丽周红史大军
Owner 三峡公共检验检测中心
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