Method for preparing phosphoric acid and byproduct fertilizer by using nitrophosphate fertilizer freezing process

A nitrophosphate fertilizer and process technology, applied in chemical instruments and methods, calcium/strontium/barium nitrate, phosphorus compounds, etc., can solve the problem of high cost, achieve the effect of increasing mineral components and facilitating absorption

Pending Publication Date: 2022-06-03
GUIZHOU BATIAN ECOTYPIC ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Battery-grade iron phosphate has less impurity content and stable quality. The synthesized lithium iron phosphate battery has stable performance and high capacity. The skeleton effect of battery-grade iron phosphate on the performance of lithium iron phosphate is more obvious; currently high-purity phosphoric acid is usually used Or phosphate and iron salt reaction, but the cost of these high-purity raw materials is very high

Method used

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  • Method for preparing phosphoric acid and byproduct fertilizer by using nitrophosphate fertilizer freezing process
  • Method for preparing phosphoric acid and byproduct fertilizer by using nitrophosphate fertilizer freezing process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] S2: The solution decomposed in S1 for refrigeration and crystallization. After the frozen crystals, low -temperature filtration is performed to remove the calcium nitrate crystals to prepare ammonium nitrate fertilizers. Obtaining the first solution, the amount of sulfuric acid is calculated according to the amount of Moore of the sulfuric acid root. The amount of Moore of the sulfuric acid root is 97%of the calcium ions in the filter liquid; The rate of ℃ / min is heated to 3 ° C and kept for 5min, then cooled at a rate of 1 ° C / min to -10 ° C, and keep it for 5 minutes.

[0023] S5: It is recycled to the second solution in S3 for preparation of phosphoric acid phosphoric fertilizer.

Embodiment 2

[0025] S3: In the case of stirring, add iron to the solution of the regulating pH obtained by S2, the nitrate iron is calculated by the molar amount, and the amount of molar amount of the nitrate iron is the amount of Moore in the solution in the solution in the solution of the pH 85%, and the stirring is filtered after the reaction is completed, the generated iron phosphate is removed, and the second solution is obtained;

[0026] In S3, before joining the iron source, first of all

[0027]After washing, the pure water was poured into the second solution and mixed in the second solution, and then nitrate fertilizer was prepared through the second solution.

Embodiment 3

Reference Figure 1-2 It is shown that the method of preparing phosphoric acid and by -yield fertilizer for phosphate fertilizer technology is used as the following steps:

S1: The phosphorus or phosphorus ore is decomposed through nitric acid to filter and remove acid insoluble objects;

S2: The decomposed solution in S1 is frozen and crystals, and then low-temperature filtration is performed after freezing crystals. Keep it for 5 minutes at 10 ° C, then heat up at a rate of 1 ° C / min to 3 ° C and keep it for 5min, then cool down at a rate of 1 ℃ / min to -10 ° C, keep it for 5 minutes, so that the circulation is 40min.

[0029] S3: In the case of stirring, add iron oxide (or tritenuxial two iron) to the first solution in S2. After adding tritenuxial dioxide, if the pH value of the solution is lower than 1, the pH value of the ammonia regulating solution is 1.5, and then the stirring will be filtered after the reaction is completed, the generated iron phosphate is removed, and the se...

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Abstract

The invention relates to the technical field of phosphoric acid preparation, and discloses a method for preparing phosphoric acid and by-producing a fertilizer by using a nitrophosphate fertilizer freezing process, and the method specifically comprises the following steps: S1, decomposing phosphorite or phosphate concentrate by using an acidolysis solution; s2, freezing and crystallizing the solution decomposed in the step S1, filtering at low temperature after freezing and crystallizing, filtering to remove solid calcium nitrate crystals for preparing the calcium ammonium nitrate fertilizer, and obtaining a first solution; s3, adding an iron source into the first solution in the S2, stirring, filtering after the reaction is completed, and removing generated iron phosphate to obtain a second solution; and S4, dissolving and extracting iron phosphate to obtain a high-purity phosphoric acid solution. According to the method, the phosphate concentrate is subjected to acidolysis through the acidolysis solution, then decalcification and denitration are conducted through a freezing method, then decalcification is conducted through sulfuric acid or sulfate, then denitration is conducted to prepare high-purity phosphoric acid, and due to reduction of solution phosphate radicals and increase of the calcium ion content, mineral components of filtrate are increased, and absorption by crops is facilitated.

Description

Technical field [0001] The patent of the invention involves the technical field of phosphate preparation. Specifically, it involves the application of phosphate fertilizer and ghost fertilizer fertilizer. Background technique [0002] As the front -wheel drive body of lithium iron phosphate, the quality of iron phosphate will directly affect the performance of lithium iron phosphate battery. Battery -grade iron phosphate impurities have little impurities, stable quality, synthetic iron phosphate battery has stable performance, high capacity, and the skeleton effect of battery -grade iron phosphate is more obvious on the performance of lithium iron phosphate. Or phosphate and iron salt reaction, but the cost of these high -purity raw materials is very high. At present, a preparation method that can greatly reduce the cost of iron phosphate, Wet phosphate is phosphate mines from strong acids such as sulfuric acid or hydrochloric acid. After the liquid isolation is separated, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01F11/38C05B11/06
CPCC01B25/375C01F11/38C05B11/06C01P2006/80Y02A40/20
Inventor 黄德明赵国军刘法安方进黄仕英程静张凌云冯军强华建青
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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