Method for preparing technical grade phosphoric acid, foodstuff grade phosphoric acid and phosphate using wet method and thin phosphoric acid

A technology of dilute phosphoric acid and phosphoric acid, applied in phosphates, chemical instruments and methods, phosphorus oxyacids, etc., can solve the problems of high concentration energy consumption and increase the difficulty of concentration, achieve good purification effect, reduce density and viscosity , the effect of reducing steam consumption
CN1313363CInactive Publication Date: 2007-05-02SICHUAN JINGCUI CHEM TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN JINGCUI CHEM TECH
Publication Date
2007-05-02
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a method for preparation of technical grade phosphoric acid with wet- process diluted phosphoric acid, which sequentially contains pretreation, secondary desulfurizion and defluorination, filteration and separation, extraction, deeply desulfurization, washing, retrograde extraction and concentration. Different from method for preparation of food-grade phosphoric acid with wet-process diluted phosphoric acid, the pretreating contains not only desulfurization, defluorination, decoloring, but also de-arsenic, de-heavy metal, and defluorination and deep concentration proceeds parallelly after retrograde extraction. The process of preparation of technical grade phosphoric acid with wet- process diluted phosphoric acid sequentially contains pretreation, secondary desulfurization and defluorination, filteration and separation, extraction, deeply desulfurization, washing, retrograde extraction, concentration, spray drying or shotcrete granulation, the extractant using in the process of retrograde extraction being KOH saturated solution or NH4OH saturated solution. With said process, it can decrease the energy consumption and the production cost; and it can produce and purify phosphoric acid, and also directly produce plural of phosphonate with the same device.
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Description

[0001] Methods for technical-grade phosphoric acid, food-grade phosphoric acid, and phosphate salts technical field

[0002] The invention belongs to a preparation method for purifying phosphoric acid and phosphate, in particular to a method for preparing industrial-grade phosphoric acid, food-grade phosphoric acid and phosphate by using wet-process dilute phosphoric acid as a raw material and adopting a solvent extraction method. Background technique

[0003] Various phosphate products produced with thermal phosphoric acid as raw materials play an important role in various fields of the national economy, and are one of the main products for exporting foreign exchange in my country. However, thermal phosphoric acid is a "four high" product with high energy consumption, high pollution, high investment and high cost. With the emergence of the energy crisis and the improvement of people's awareness of environmental prot...

Claims

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