Preparation method for producing monocalcium phosphate slurry by using wet phosphoric acid slurry process

A technology of calcium dihydrogen phosphate and wet-process phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as unfavorable packaging, storage and transportation, incomplete reaction, reheating and agglomeration, and achieve good economic benefits. and environmental benefits, saving production costs and reducing consumption

Pending Publication Date: 2020-03-06
WENGFU (GRP) CO LTD
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Problems solved by technology

[0002] In the pulping process of calcium dihydrogen phosphate produced by the wet phosphoric acid slurry method, in order to reduce the drying cost as much as possible, the direct mixing reaction method of phosphoric acid and calcium carbonate powder is usually used for pulping. Incomplete reaction leads to high free acidity of the product, causing adverse effects such as reheating and agglomeration, which is not conducive to packaging, storage and transportation, and reducing calcium carbonate powder packaging in the pulping process of calcium dihydrogen phosphate can improve product quality and prevent condensation in packaging, storage and transportation It can also greatly reduce the consumption of phosphoric acid in the production process of calcium dihydrogen phosphate. The preparation method of calcium dihydrogen phosphate slurry produced by wet phosphoric acid slurry method is very critical

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  • Preparation method for producing monocalcium phosphate slurry by using wet phosphoric acid slurry process

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Embodiment 1

[0014] A preparation method for producing calcium dihydrogen phosphate slurry by a wet-process phosphoric acid slurry method, comprising the steps of:

[0015] (1) Calcium carbonate powder with a purity of more than 98% and a fineness of more than 200 meshes and tail gas cleaning solution (the solute is mainly calcium dihydrogen phosphate) and calcium carbonate powder / tail gas cleaning solution of 0.9 are mixed evenly to prepare calcium carbonate powder slurry;

[0016] (2) Prepare pretreated phosphoric acid by adding defluorinating agent at 5% to 10% of concentrated phosphoric acid with phosphorus pentoxide content of 48% or more, and adding arsenic agent at 0.1% to 0.3% for impurity purification;

[0017] (3) Calcium carbonate powder slurry and pretreated phosphoric acid were mixed at a phosphorus-to-calcium ratio of 1.70, thoroughly mixed in a multi-stage series reaction system, and reacted for 4 hours to prepare calcium dihydrogen phosphate slurry.

[0018] Reduce the amou...

Embodiment 2

[0020] A preparation method for producing calcium dihydrogen phosphate slurry by a wet-process phosphoric acid slurry method, comprising the steps of:

[0021] (1) Calcium carbonate powder with a purity of more than 98% and a fineness of more than 200 meshes and tail gas washing liquid (the solute is mainly calcium dihydrogen phosphate) and calcium carbonate powder / tail gas washing liquid of 0.8 are mixed evenly to prepare calcium carbonate powder slurry;

[0022] (2) Prepare pretreated phosphoric acid by adding defluorinating agent at 5% to 10% of concentrated phosphoric acid with phosphorus pentoxide content of 48% or more, and adding arsenic agent at 0.1% to 0.3% for impurity purification;

[0023] (3) Calcium carbonate powder slurry and pretreated phosphoric acid are mixed at a phosphorus-to-calcium ratio of 1.65, fully mixed in a multi-stage series reaction system, and reacted for 4 hours to prepare calcium dihydrogen phosphate slurry.

[0024] Reduce the amount of calciu...

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Abstract

The invention discloses a preparation method for producing monocalcium phosphate slurry by using a wet phosphoric acid slurry process. The method comprises the following steps: (1) uniformly mixing calcium carbonate powder having a purity of 98% or above and fineness of 200 meshes or above with a tail gas washing solution according to a certain ratio to prepare calcium carbonate powder slurry forlater use; (2) adding a defluorinating agent and an arsenic removing agent into strong phosphoric acid with a phosphorus pentoxide content of 48% or above according to a certain ratio, and carrying out impurity purification to prepare pretreated phosphoric acid for later use; and (3) fully mixing the calcium carbonate powder slurry with the pretreated phosphoric acid according to a certain ratio through a multi-stage cascade reaction system, and carrying out a reaction for 4 hours to complete the preparation of the monocalcium phosphate slurry. According to the invention, calcium powder coating in the reaction process can be remarkably reduced, the free acid content of the product is reduced, and product quality is improved; the consumption of main materials for production is reduced, andproduction cost is saved; in addition, tail washing water is recycled, and good economic benefits and environmental protection benefits are achieved.

Description

technical field [0001] The invention relates to the field of production methods of chemical products, in particular to a method for preparing calcium dihydrogen phosphate slurry produced by a wet-process phosphoric acid slurry method. Background technique [0002] In the pulping process of calcium dihydrogen phosphate produced by the wet phosphoric acid slurry method, in order to reduce the drying cost as much as possible, the direct mixing reaction method of phosphoric acid and calcium carbonate powder is usually used for pulping. Incomplete reaction leads to high free acidity of the product, causing adverse effects such as reheating and agglomeration, which is not conducive to packaging, storage and transportation, and reducing calcium carbonate powder packaging in the pulping process of calcium dihydrogen phosphate can improve product quality and prevent condensation in packaging, storage and transportation It can also greatly reduce the consumption of phosphoric acid in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
CPCC01B25/325
Inventor 缪钊董文斌王权顶
Owner WENGFU (GRP) CO LTD
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