阅读说明：本技术 一种渣酸生产饲料添加剂的方法 (Method for producing feed additive by using acid residue ) 是由 孙天桥 于 2020-06-24 设计创作，主要内容包括：本发明提供一种渣酸生产饲料添加剂的方法,其特征在于：将渣酸采用板框式过滤机进行过滤后自然沉淀,在沉淀过程中加入2%的聚丙烯酸酰胺作为沉淀剂使用,对沉淀后的上清液清酸可用来生产饲料磷酸氢钙,然后在清酸中加入4%的脱氟剂,脱氟剂为正常市售脱氟剂,过滤得到脱氟酸,将脱重剂加入到脱氟酸中进行脱重,得到净化酸用于生产饲料添加剂。(The invention provides a method for producing a feed additive by using acid residue, which is characterized by comprising the following steps: filtering the slag acid by a plate and frame filter, naturally precipitating, adding 2% of polyacrylamide as a precipitator in the precipitation process, adding 4% of defluorination agent into the supernatant clear acid after precipitation, wherein the defluorination agent is a normal commercial defluorination agent, filtering to obtain defluorination acid, and adding the defluorination agent into the defluorination acid for removing weight to obtain purified acid for producing the feed additive.)

1. A method for producing a feed additive by using slag acid is characterized by comprising the following steps: the method comprises the following steps:

A. preparing raw materials, namely collecting slag acid generated in the production of phosphoric acid, filtering by using a plate and frame filter, and naturally precipitating after filtering to obtain a solid phase substance and clear acid;

B. preparing defluorinated acid, namely adding a defluorinating agent into clear acid for defluorination, and filtering after defluorination to obtain a solid phase substance and the defluorinated acid;

C. preparing purified acid, namely adding a weight removing agent into the defluorinated acid for weight removal, and filtering after weight removal to obtain a solid phase substance and the purified acid;

D. production of the feed additive, namely adding the purified acid into the production of the feed additive according to a normal production flow for production;

E. and (3) treating the solid phase, namely putting the solid phase obtained in the step into the production process of the fertilizer to produce the fertilizer.

2. The method for producing the feed additive by using the slag acid as claimed in claim 1, wherein the method comprises the following steps: and in the step A, a precipitator is added during precipitation, and the precipitator is one or a mixture of two of polyacrylamide and diatomite.

3. The method for producing the feed additive by using the slag acid as claimed in claim 2, wherein the method comprises the following steps: the addition of the precipitant is 2-5%.

4. The method for producing the feed additive by using the slag acid as claimed in claim 3, wherein the method comprises the following steps: the addition of the precipitant was 3%.

5. The method for producing the feed additive by using the slag acid as claimed in claim 1, wherein the method comprises the following steps: and the addition amount of the defluorinating agent in the step B is 1-5%.

6. The method for producing the feed additive by using the slag acid as claimed in claim 5, wherein the method comprises the following steps: the addition amount of the defluorinating agent in the step B is 3 percent.

7. The method for producing the feed additive by using the slag acid as claimed in claim 5, wherein the method comprises the following steps: and C, the weight removing agent in the step C is one or a mixture of more of sodium sulfide, white carbon black and anhydrous sodium sulphate, and the addition amount of the weight removing agent is 0.1-0.8%.

8. The method for producing the feed additive by using the slag acid as claimed in claim 7, wherein the method comprises the following steps: the addition amount of the weight removing agent is 0.3 percent.

9. The method for producing the feed additive by using the slag acid as claimed in claim 7, wherein the method comprises the following steps: the white carbon black, the copper sulfide and the anhydrous sodium sulphate in the weight removing agent are 1:1: 1.

Technical Field

The invention relates to the technical field of phosphorus chemical production, in particular to a method for producing a feed additive by using acid residue.

Background

The slag acid is a product formed in the production process of wet-process phosphoric acid, the wet-process phosphoric acid is prepared by decomposing phosphate ore by using sulfuric acid, filtering and concentrating, the phosphate ore contains a large amount of metal impurities, the solubility of impurity ions is reduced along with the increase of the concentration of the phosphoric acid in the concentration process, the supersaturation degree is increased, crystals are precipitated to form slag acid, the proportion of the slag acid to the actual amount of the phosphoric acid is up to 6%, the slag acid precipitate is almost composed of crystalline compounds, and Fe, Ca, Mg, Al, Na, K, F, Si, SO 42-and other impurities in the compounds play an important role in the generation of the slag acid, common compounds in the phosphoric acid slag acid comprise CaSO 4.2H2O, NaKSiF6 and the like, and when the concentration of the phosphoric acid in the wet-process phosphoric acid is different, the chemical composition for forming the slag acid is also different. The fluoride and fluorosilicate levels in settled sludge are generally low. Among the acidic phosphates of iron, the most common are various compounds of the FeKH2(PO4)2 isomorphous series.

At present, the utilization of wet-process phosphoric acid slag acid in China mostly stays in the experimental research stage, the production investment is very little, and many companies in China do not filter-press and separate the slag acid but directly produce phosphate fertilizers and phosphorus compound fertilizer products with medium and low concentrations.

Disclosure of Invention

The invention aims to provide a method for producing feed additives by using slag acid, which is used for producing the feed additives by using purified acid obtained after filtration, precipitation, defluorination and weight removal.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method for producing a feed additive by using slag acid is characterized by comprising the following steps: the method comprises the following steps:

A. preparing raw materials, namely collecting slag acid generated in the production of phosphoric acid, filtering by using a plate and frame filter, and naturally precipitating after filtering to obtain a solid phase substance and clear acid;

B. preparing defluorinated acid, namely adding a defluorinating agent into clear acid for defluorination, and filtering after defluorination to obtain a solid phase substance and the defluorinated acid;

C. preparing purified acid, namely adding a weight removing agent into the defluorinated acid for weight removal, and filtering after weight removal to obtain a solid phase substance and the purified acid;

D. production of the feed additive, namely adding the purified acid into the production of the feed additive according to a normal production flow for production;

E. and (3) treating the solid phase, namely putting the solid phase obtained in the step into the production process of the fertilizer to produce the fertilizer.

In a further preferred embodiment of the present invention, a precipitating agent is added in the step a during precipitation, and the precipitating agent is one or a mixture of two of polyacrylamide and diatomite.

As a further preferred embodiment of the present invention, the addition of the precipitant is 2 to 5%.

As a further preferred embodiment of the present invention, the addition of the precipitant is 3%.

As a further preferable scheme of the invention, the addition amount of the defluorinating agent in the step B is 1-5 percent

In a further preferred embodiment of the present invention, the amount of the defluorinating agent added in step B is 3%.

As a further preferable scheme of the invention, the weight removing agent in the step C is one or a mixture of more of sodium sulfide, white carbon black and anhydrous sodium sulphate, and the adding amount of the weight removing agent is 0.1-0.8%.

In a further preferred embodiment of the present invention, the amount of the weight loss agent added is 0.3%.

In a further preferable embodiment of the present invention, the white carbon black, the copper sulfide and the anhydrous sodium sulphate in the weight reducing agent are 1:1: 1.

The invention has the beneficial effects that the slag acid is treated by the production processes of filtering, defluorination and heavy component removal, the harmful components in the slag acid are removed, the production of feed additives is met, the slag acid is utilized in a grading way, and the utilization efficiency of raw materials is improved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Filtering the slag acid by a plate and frame filter, naturally precipitating, adding 2% of polyacrylamide as a precipitator in the precipitation process, adding 4% of defluorination agent into the supernatant clear acid after precipitation, wherein the defluorination agent is a normal commercial defluorination agent, filtering to obtain defluorination acid, and adding the defluorination agent into the defluorination acid for removing weight to obtain purified acid for producing the feed additive.

It is summarized from the above table that the total phosphorus content is maintained at substantially the same level after the slag acid is filtered in the continuous filtering and treating process, which indicates that the total phosphorus content is not reduced in the whole process flow; the content of hydrogen ions is not substantially reduced in the whole process, the acidity of the whole material can be maintained, and new phosphoric acid is not required to be added to compensate the hydrogen ions; after the defluorinating agent is added, the content of fluoride ions in the material can be obviously reduced; and finally, after the weight removing agent is added, metal ions in the material can be effectively removed, the activity of the material is improved, and the production requirement is met.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.