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A method for demagnesification of phosphate rock and co-production of sodium fluorosilicate and magnesium sulfate

A technology of sodium fluorosilicate and magnesium sulfate, applied in magnesium sulfate, fluorosilicic acid, chemical instruments and methods, etc., can solve problems such as eutrophication of phosphorus water, soil acidification, and environmental pollution

Active Publication Date: 2020-12-22
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research and application of the process of magnesium removal by chemical extraction has become the key research content of the reasonable application of medium and low-grade phosphate rocks. In addition, in the process of magnesium removal by chemical extraction of phosphate rock slurry, there will be a large amount of magnesium and a small amount of calcium, iron, Aluminum and other metal cations, phosphorus, and sulfur acidic waste liquids have complex components. If they are discharged directly without treatment, they will cause serious pollution to the environment. Phosphorus will cause eutrophication of water bodies, and acidic waste liquids will change the pH value of water bodies and inhibit microorganisms. Growth, impeding self-purification of water bodies, causing soil acidification

Method used

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  • A method for demagnesification of phosphate rock and co-production of sodium fluorosilicate and magnesium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A method for magnesium removal from phosphate rock and co-production of sodium fluorosilicate and magnesium sulfate, comprising the following steps:

[0064] (1) Magnesium removal: Add water to the phosphate rock to make a phosphate rock slurry with a content of 40%, pump it into the reaction tank, heat it to 45°C and keep it constant, and drop dilute fluosilicic acid with a concentration of 1 to 15mol / L at a constant speed Add it to the phosphate rock slurry, keep the pH constant at 1.0, react for 2 hours, separate the solid and liquid to obtain the filter cake and filtrate, wash the filter cake 2-3 times with water, and dry to obtain the phosphate concentrate; the washing liquid and the filtrate are mixed , sent to wet-process phosphoric acid production tail gas scrubbing and absorption system to prepare fluosilicic acid solution;

[0065] (2) Synthesis of sodium fluorosilicate: the content of 5% fluorosilicate solution in step (1) is sent to the sodium fluorosilicate...

Embodiment 2

[0068] A method for magnesium removal from phosphate rock and co-production of sodium fluorosilicate and magnesium sulfate, comprising the following steps:

[0069] (1) Magnesium removal: Add water to the phosphate rock to make a phosphate rock slurry with a content of 50%, pump it into the reaction tank, heat it to 65°C, and then add dilute fluosilicic acid with a concentration of 15mol / L dropwise at a constant speed to In the phosphate rock slurry, the pH is constant at 4.0, react for 5 hours, and separate the solid and liquid to obtain the filter cake and filtrate, and wash the filter cake 2-3 times with water, and dry to obtain phosphorus concentrate; the washing liquid and the filtrate are mixed and sent to Fluorosilicic acid solution is prepared in the tail gas scrubbing and absorption system of wet-process phosphoric acid production;

[0070] (2) Synthesis of sodium fluorosilicate: the content of 15% fluorosilicate solution in step (1) is sent to the sodium fluorosilica...

Embodiment 3

[0073] A method for magnesium removal from phosphate rock and co-production of sodium fluorosilicate and magnesium sulfate, comprising the following steps:

[0074] (1) Magnesium removal: Add water to the phosphate rock to make a phosphate rock slurry with a content of 45%, pump it into the reaction tank, heat it to 50°C and keep it constant, and drop dilute fluosilicic acid with a concentration of 1 to 15mol / L at a constant speed Add it to the phosphate rock slurry, keep the pH constant at 2.5, react for 3 hours, separate the solid and liquid to obtain the filter cake and filtrate, wash the filter cake 2-3 times with water, and dry to obtain the phosphate concentrate; the washing liquid and the filtrate are mixed , sent to wet-process phosphoric acid production tail gas scrubbing and absorption system to prepare fluosilicic acid solution;

[0075] (2) Synthesis of sodium fluorosilicate: the content of 10% fluorosilicate solution in step (1) is sent to the sodium fluorosilicat...

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Abstract

The invention belongs to the technical field of quality improvement of phosphate rocks, and particularly relates to a method for removal of magnesium from phosphate rocks and co-production of sodium fluorosilicate and magnesium sulfate. The method comprises the following steps of: (1) removal of magnesium; (2) synthesis of sodium fluorosilicate; and (3) synthesis of magnesium ammonium phosphate. According to the method for removal of magnesium from the phosphate rocks and co-production of sodium fluorosilicate and magnesium sulfate, general coupling of magnesium removal of the phosphate rocks,production of sodium fluorosilicate, production of magnesium ammonium phosphate and wet extraction production of phosphoric acid is achieved, sewage closed loop circulation during the production of sodium fluorosilicate and secondary use of a fluorosilicic acid intermediate product are achieved, and the consumption of sulfuric acid during the wet extraction production of phosphoric acid is reduced; a two-step chemical precipitation method is utilized to synthesize sodium fluorosilicate and magnesium ammonium phosphate sequentially by using magnesium removing liquid of the phosphate rocks, multiple shortcomings of a traditional treatment process of the magnesium removing liquid of the phosphate rocks are overcome, and co-production of sodium fluorosilicate and magnesium ammonium phosphateis achieved.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock quality improvement, in particular to a method for demagnesizing phosphate rock and co-producing sodium fluorosilicate and magnesium sulfate. Background technique [0002] my country's phosphate rock resources are in the status quo of "more but not rich, more in the south and less in the north, difficult to choose and distinguish". The Ministry of Land and Resources has listed phosphate rock as one of the 20 mineral resources that cannot meet the needs of national production. With the increasing demand for phosphate rock resources in the phosphorus chemical industry and the continuous consumption of rich ore, how to rationally and effectively use low-grade phosphorus Mine, especially high-magnesium phosphate rock, is a difficult problem faced by my country's phosphorus chemical industry at this stage. In low- and medium-grade phosphate rock, the main impurities are dolomite, quartz, clay, ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/01C01B25/22C01B25/45C01B33/10C01F5/40
CPCC01B25/01C01B25/2208C01B25/451C01B33/103C01F5/40
Inventor 项双龙吴有丽陈彬廖吉星张诚张伟蒋学华张文唐丽君韩朝应何花王采艳
Owner GUIYANG KAILIN FERTILIZER CO LTD
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