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A method for producing fire-fighting special map by utilizing dihydrate wet-process dilute phosphoric acid

A technology of dilute phosphoric acid and dihydrate method, which is applied in the direction of phosphate, phosphorus oxyacid, etc., which can solve the problems of high material requirements for concentration devices, easy-to-corrosion equipment, and inability to produce, so as to ensure the moisture content of products and the utilization rate of raw materials High, bright white effect

Active Publication Date: 2020-05-22
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] P in dilute phosphoric acid produced by our dihydrate wet method 2 o 5 The content is generally 20-23%. In the past, dilute phosphoric acid with this concentration was directly put into production, and only 55-57% MAP could be produced, and it was impossible to produce 60-68% MAP for fire protection.
How to effectively increase the water-soluble P in the product 2 o 5 Content, reducing the water content of finished products, has become a key factor restricting the successful implementation of new technologies. The traditional method is to concentrate dilute phosphoric acid to P 2 o 5 The concentration is more than 45%. Impurities in dilute phosphoric acid are removed by concentration, and then the concentrated phosphoric acid is neutralized with ammonia gas to produce MAP for fire protection. However, this method not only requires high concentration device materials, but also consumes a lot of energy. A large amount of fluosilicic acid by-products will be produced during the concentration process. Fluosilicic acid is corrosive and easy to corrode equipment, and the traditional technology contains more soluble P 2 o 5 , the part P in the fire special MAP 2 o 5 is useless phosphorus, P 2 o 5 more losses

Method used

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  • A method for producing fire-fighting special map by utilizing dihydrate wet-process dilute phosphoric acid
  • A method for producing fire-fighting special map by utilizing dihydrate wet-process dilute phosphoric acid

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 Shown, a kind of method that utilizes dihydric wet process dilute phosphoric acid to produce fire-fighting special-purpose MAP, carry out according to the following steps:

[0027] Step 1: Mix the dilute phosphoric acid produced by the dihydric wet method with ammonia gas to perform a primary neutralization reaction to prepare a primary slurry, and control the neutralization degree of the primary slurry to 1.2;

[0028] Step 2: Separating the primary slurry from liquid to solid, adding 98% concentrated sulfuric acid to the clear liquid separated from the primary slurry, performing secondary neutralization reaction to prepare secondary slurry, and controlling the neutralization of the secondary slurry degree is 1.0;

[0029] Add dilute phosphoric acid first to the filter residue separated from the first-stage slurry, then add potassium sulfate, ammonium sulfate and other raw materials, and finally pass through ammonia gas to carry out by-product neutral...

Embodiment 2

[0034] Such as figure 1 , a kind of method that utilizes dihydric wet method dilute phosphoric acid to produce fire-fighting special-purpose MAP, carry out according to the following steps:

[0035] Step 1: Mix the dilute phosphoric acid produced by the dihydric wet method with ammonia gas to perform a primary neutralization reaction to prepare a primary slurry, and control the neutralization degree of the primary slurry to 1.4;

[0036] Step 2: Separating the primary slurry from liquid to solid, adding 98% concentrated sulfuric acid to the clear liquid separated from the primary slurry, performing secondary neutralization reaction to prepare secondary slurry, and controlling the neutralization of the secondary slurry degree is 1.1;

[0037] Add dilute phosphoric acid first to the filter residue separated from the first-stage slurry, then add potassium sulfate, ammonium sulfate and other raw materials, and finally pass through ammonia gas to carry out by-product neutralizatio...

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Abstract

The invention discloses a producing method for special MAP for fire protection by using dehydrate wet-process phosphoric acid. The production method comprises the following steps that 1, phosphoric acid produced through the dehydrate wet-process and ammonia gas are mixed and are subjected to the first-order neutral reaction to produce a first-order sizing agent, and the neutralization degree of the first-order sizing agent is controlled to be 1.2-1.4; 2, liquid-solid separation is carried out on the first-order sizing agent, 98% of concentrated sulfuric acid is added into clear liquid separated from the first-order sizing agent, second-order neutral reaction is carried out to produce a second-order sizing agent, the neutralization degree of the second-order sizing agent is controlled to be1.0-1.1; 3, concentration treatment is carried out on the second-order sizing agent, redundant moisture is evaporated from the second-order sizing agent, and the mass percentage content of final moisture in the second-order sizing agent is controlled to be 19wt%-23wt%; 4, the second-order sizing agent after concentration is dried, and the special MAP with the concentration of 60%-68% for the fireprotection is obtained after subsequent treatment. All the raw materials involved in the method can be made into products, the raw material utilization is high, and no pollutants are produced; in addition, compared with the traditional production method for the special MAP for the fire protection, the method in low in energy consumption, the qualification rate of water content in the product is high, the color is bright white, and the agglomeration phenomenon cannot occur.

Description

technical field [0001] The invention relates to the technical field of deep processing of phosphoric acid, in particular to a method for producing MAP special for fire protection by using dihydric wet-process dilute phosphoric acid. Background technique [0002] At present, due to the serious excess of international fertilizer production capacity, the "zero growth" plan for fertilizer use issued by the state, and the strong requirements of the state on safety and environmental protection, the production and sales of many chemical products have become very severe. How to adjust product structure and develop new products? Products and increase the added value of products have become urgent problems for most chemical plants. 55%MAP(P 2 o 5 The abbreviation of MAP with the concentration of N being 55%, the following expressions are all referred to as MAP, as one of our main products, has faced a very severe production and sales situation, 60%, 62%, 64%, and 68% for fire protec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C09K21/04
CPCC01B25/28C09K21/04
Inventor 冯永刚王建秋李兵黄玉华杨军谭襄渝倪世平潘登山
Owner 中化重庆涪陵化工有限公司