Method for producing compound fertilizer by using phosphorite tailings

A technology for phosphate rock tailings and compound fertilizers, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of high cost of sulfuric acid acid hydrolysis, precipitation hindering reaction, etc., and achieve the effect of low cost and improving reaction speed.

Pending Publication Date: 2022-07-12
湖北艾迪普生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for producing compound fertilizer using phosphate rock tailings, which solves the problems in the prior art that the cost of using sulfuric acid for acid hydrolysis is high, and the generated precipitates hinder Response to further questions

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Embodiment 1

[0023] In the present embodiment, a method for producing compound fertilizer using phosphate rock tailings is proposed, comprising the following steps:

[0024] S1. Grind 2t phosphate rock tailings raw material to a fineness of 200 mesh and put it into the reaction vessel, then add a buffer of 5% wt of the raw material, in this embodiment, the buffer is EDTMPS, and then add industrial waste phosphoric acid to pH≤4.5 , stirred at 65°C for 3h;

[0025] S2. The mixed solution is separated from solid and liquid by centrifugation. After the solid sinks to the bottom and aggregates, the upper layer solution is discharged to separate out the insoluble solid, the insoluble solid is washed with water, and the washed liquid is incorporated into the remaining solution; then the remaining solution is Slowly evaporate and crystallize at 50°C until all the products in the solution are precipitated;

[0026] S3. Use vacuum filtration for solid-liquid separation to remove the remaining acidi...

Embodiment 2

[0028] In the present embodiment, a method for producing compound fertilizer using phosphate rock tailings is proposed, comprising the following steps:

[0029] S1. Grind the 2t phosphate rock tailings raw material to a fineness of 180 mesh and put it into the reaction vessel, then add a buffer with a raw material quality of 7% wt. In this embodiment, the buffer is EDTMPS, and then add industrial waste phosphoric acid to pH≤4.5 , and stirred at 75°C for 2.5h;

[0030] S2. The mixed solution is separated from solid and liquid by centrifugation. After the solid sinks to the bottom and aggregates, the upper layer solution is discharged to separate out the insoluble solid, the insoluble solid is washed with water, and the washed liquid is incorporated into the remaining solution; then the remaining solution is Slowly evaporate and crystallize at 55°C until all the products in the solution are precipitated;

[0031] S3. Use vacuum filtration for solid-liquid separation, remove the...

Embodiment 3

[0033] In the present embodiment, a method for producing compound fertilizer using phosphate rock tailings is proposed, comprising the following steps:

[0034] S1. Grind the raw material of 2t phosphate rock tailings to a fineness of 160 mesh and put it into a reaction vessel, then add a buffer of 8% wt of the raw material, in this embodiment, the buffer is EDTMPS, and then add industrial waste phosphoric acid to pH≤4.5 , and stirred at 85°C for 2h;

[0035] S2. The mixed solution is centrifuged for solid-liquid separation, the solid is collected at the bottom and the upper layer solution is discharged to separate out the insoluble solid, the insoluble solid is washed with water, and the washed liquid is incorporated into the remaining solution; then the remaining solution is Slowly evaporate and crystallize at 60 °C until all the products in the solution are precipitated;

[0036] S3. Use vacuum filtration for solid-liquid separation to remove the remaining acidic solution,...

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Abstract

The invention provides a method for producing a compound fertilizer by using phosphorite tailings, which comprises the following steps: grinding phosphorite tailings raw materials into powder, putting the powder into a reaction container, adding a buffering agent, adding industrial waste phosphoric acid until the pH value is less than or equal to 4.5, and stirring for 2-3 hours at 65-85 DEG C; carrying out solid-liquid separation to remove insoluble solids, and slowly evaporating and crystallizing the residual solution at 50-60 DEG C; and carrying out solid-liquid separation again, washing the solid material with water, and then drying the solid material to obtain the compound fertilizer product. Industrial waste phosphoric acid is used as an acidolysis raw material, so that the method is low in cost and environment-friendly; according to the invention, EDTMPS, DTPMPA or EDDHA is used as a buffering agent, a stable chelate is formed through a chelation reaction between the chelating agent and calcium and magnesium ions, and the metal chelate is generally of a flocculent structure and can flow in a solution, so that further reaction between acid and internal raw materials cannot be blocked, and the reaction speed and the final reaction degree are improved.

Description

technical field [0001] The invention relates to the technical field of production of phosphorus-containing compound fertilizers, in particular to a method for producing compound fertilizers by using phosphate rock tailings. Background technique [0002] Phosphate rock is an important chemical mineral raw material. It can be used to produce phosphate fertilizers, and can also be used to produce yellow phosphorus, phosphoric acid, phosphide and other phosphates, which can be used in medicine, food, matches, dyes, sugar, ceramics, national defense and other industrial sectors. The industrial application of phosphate rock has a history of more than 100 years. There are about 120 kinds of phosphorus-containing minerals known in nature, which are widely distributed. However, there are only a few phosphorus-containing minerals that can be exploited and utilized according to their quality and quantity. In industry, the main phosphorus-containing minerals for phosphorus extraction ...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B17/00C05G3/00Y02A40/20
Inventor 郑海峰
Owner 湖北艾迪普生物科技有限公司
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