Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of method utilizing wet-process phosphoric acid to produce industrial phosphate

A wet-process phosphoric acid and phosphate technology, applied in chemical instruments and methods, applications, animal husbandry, etc., can solve the problems of high production cost, low yield of phosphorus pentoxide, high loss of phosphorus, etc., and achieve the effect of great cost advantage

Active Publication Date: 2016-06-29
KUNMING CHUAN JINNUO CHEM IND
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of industrial grade sodium phosphate or industrial grade potassium phosphate by wet-process phosphoric acid, the by-product phosphoric acid slag in the process of neutralization and purification can only be sold or used as fertilizer grade phosphate, the loss of phosphorus is high, and the yield of phosphorus pentoxide input Low, high production cost, poor quality of industrial grade phosphate produced

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of method utilizing wet-process phosphoric acid to produce industrial phosphate
  • A kind of method utilizing wet-process phosphoric acid to produce industrial phosphate
  • A kind of method utilizing wet-process phosphoric acid to produce industrial phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: the specific production process of producing industrial grade disodium hydrogen phosphate dodecahydrate with wet-process phosphoric acid is as follows:

[0044] Add quantitative phosphate rock powder into wet-process phosphoric acid, control the reaction temperature to 65°C, and the reaction time to 1.5 hours for continuous continuous operation. Neutralize the desulfurized clear liquid with sodium carbonate (ie one-step neutralization), and control the end point pH value to 3.2 to obtain dibasic disodium phosphate solution. After neutralization, the first-stage cleaning process enters the next process, and the filter residue with high impurity content obtained after filtering the neutralized slurry is used or sold as fertilizer-grade calcium hydrogen phosphate. Calcium hydroxide feed solution (milk of lime) is used to neutralize one stage of clear liquid (that is, two stage neutralization), the reaction temperature is controlled to 46°C, and the final pH v...

Embodiment 2

[0048] Embodiment 2: the specific production process of producing industrial grade disodium hydrogen phosphate dodecahydrate with wet-process phosphoric acid is as follows:

[0049] Add quantitative phosphate rock powder into wet-process phosphoric acid, control the reaction temperature at 67°C, and conduct intermittent operation for 2 hours. Neutralize the desulfurized clear liquid with sodium carbonate (that is, one-step neutralization), and control the end point pH value to 3.4 to obtain a dilute disodium hydrogen phosphate solution. After neutralization, the first-stage cleaning process enters the next process, and the filter residue with high impurity content obtained after filtering the neutralized slurry is used or sold as fertilizer-grade calcium hydrogen phosphate. Calcium hydroxide feed solution (milk of lime) is used to neutralize one stage of clear liquid (that is, two stage neutralization), and the reaction temperature is controlled to 47° C., and the final pH val...

Embodiment 3

[0054] Embodiment 3: the production process of producing industrial grade dipotassium hydrogen phosphate trihydrate with wet-process phosphoric acid is as follows:

[0055] Add quantitative phosphate rock powder into wet-process phosphoric acid, control the reaction temperature at 66°C, and the reaction time is 2.0 hours, and take discontinuous operation. The clear liquid after desulfurization is neutralized with potassium hydroxide (that is, one-step neutralization), and the pH value at the end point is controlled to be 3.5 to obtain a dilute potassium dihydrogen phosphate solution. After neutralization, the first-stage cleaning process enters the next process, and the filter residue with high impurity content obtained after filtering the neutralized slurry is used or sold as fertilizer-grade calcium hydrogen phosphate. Calcium hydroxide feed solution (milk of lime) is used to neutralize one stage of clear liquid (that is, two stage neutralization), and the reaction temperatu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for producing industrial phosphate by using wet-process phosphoric acid sequentially comprises the following process steps: (1), ground phosphate rock desulfuration, that is, the quantitative ground phosphate rock is added into the wet-process phosphoric acid, the reaction temperature is controlled within 60-70 DEG C, the reaction time is within 1.5-2.0 hours, and the end pH value is controlled within 3.2-3.6; (2), soda or potassa is used to neutralize the wet-process phosphoric acid, the reaction temperature is controlled within 60-70 DEG C, the end pH value is 7.5-8.8, and disodium hydrogen phosphate or dipotassium hydrogen phosphate slurry is obtained. By adopting the process technique, the yield of phosphorus pentoxide can be improved by 15 percent, the quality of the industrial phosphate product is fully guaranteed, and the process technique can be popularized in large-scale feed-grade calcium phosphate salt production enterprises.

Description

technical field [0001] The invention relates to a production process of industrial-grade phosphate, in particular to a process technology for producing industrial-grade phosphate with wet-process phosphoric acid. Background technique [0002] The production methods of industrial grade sodium phosphate or industrial grade potassium phosphate mainly include thermal phosphoric acid method and wet phosphoric acid method using yellow phosphorus as raw material. The thermal phosphoric acid method needs yellow phosphorus or thermal phosphoric acid as raw material, the production process is mature, and the product quality is stable, but the production cost is relatively high, and the product lacks competitiveness in the market. The production of industrial grade sodium phosphate or industrial grade potassium phosphate by wet-process phosphoric acid, the by-product phosphoric acid slag in the process of neutralization and purification can only be sold or used as fertilizer grade phos...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C01B25/32A23K20/26A23K20/24
Inventor 曾润国刘甍魏家贵刘泽祥杨兴冯发钧周永祥
Owner KUNMING CHUAN JINNUO CHEM IND