阅读说明：本技术 一种硼酸的制作工艺 (Preparation process of boric acid ) 是由 郝波 郝俊芳 范红月 于 2021-09-29 设计创作，主要内容包括：本发明涉及化工技术领域,且公开了一种硼酸的制作工艺,包括以下步骤,S1,硼渣洗涤,在粗硼渣中加入饱和硼酸母液,使部分氯化镁、硫酸镁等杂质进入液相,分离部分杂质；S2,热溶过滤,在洗涤后的粗硼渣中加入淡水以及部分饱和硼酸母液并加热,使硼酸全部进入液相；S3,冷却结晶,通过真空结晶器将热硼酸母液冷却至常温,使硼酸从母液中析出固相,分离得到粗硼酸；S4,硼酸洗涤,在粗硼酸中加入纯净水,使粗硼酸中夹带的少量的氯化镁、硫酸镁等杂质进入液相,得到湿的硼酸；S5,干燥包装,通过蒸汽加热,将湿硼酸脱水后包装得硼酸产品。该一种硼酸的制作工艺,制作工艺简单,制作成本低,副产品少,产出率高,而且制得的硼酸纯度高。(The invention relates to the technical field of chemical industry, and discloses a preparation process of boric acid, which comprises the following steps of S1, washing boron slag, adding saturated boric acid mother liquor into crude boron slag, enabling partial impurities such as magnesium chloride, magnesium sulfate and the like to enter a liquid phase, and separating partial impurities; s2, hot-melt filtering, adding fresh water and partial saturated boric acid mother liquor into the washed crude boron slag, and heating to ensure that all boric acid enters a liquid phase; s3, cooling and crystallizing, cooling the hot boric acid mother liquor to normal temperature through a vacuum crystallizer, separating the boric acid from the mother liquor to obtain a solid phase, and separating to obtain crude boric acid; s4, washing with boric acid, adding purified water into the crude boric acid to make impurities such as magnesium chloride, magnesium sulfate and the like carried in the crude boric acid enter a liquid phase to obtain wet boric acid; s5, drying and packaging, and dehydrating the wet boric acid by steam heating and packaging to obtain the boric acid product. The preparation process of the boric acid has the advantages of simple preparation process, low preparation cost, less byproducts, high yield and high purity of the prepared boric acid.)

1. A manufacturing process of boric acid is characterized in that: comprises the following steps of (a) carrying out,

firstly, washing boron slag, adding saturated boric acid mother liquor into crude boron slag in a workshop, enabling partial impurities such as magnesium chloride, magnesium sulfate and the like to enter a liquid phase, and separating partial impurities;

secondly, hot-melt filtration, namely adding fresh water and partially saturated boric acid mother liquor into the washed crude boron slag and heating to ensure that all boric acid enters a liquid phase to separate water-insoluble impurities;

step three, cooling crystallization, namely cooling the hot boric acid mother liquor to normal temperature through a vacuum crystallizer to separate boric acid out of a solid phase from the mother liquor, and separating to obtain crude boric acid;

fourthly, washing boric acid, namely adding purified water into the crude boric acid to ensure that a small amount of impurities such as magnesium chloride, magnesium sulfate and the like carried in the crude boric acid enter a liquid phase to achieve the aim of purifying the boric acid and obtain wet boric acid;

and fifthly, drying and packaging, dehydrating the wet boric acid through steam heating, and packaging to obtain a boric acid product.

2. The process for preparing boric acid according to the first step of claim 1, wherein: the saturated boric acid mother liquor is generally the cold mother liquor of the cooling crystallization section.

3. The process according to the second step of claim 1, wherein: and heating to a boiling point of 95-100 ℃.

4. The process for preparing boric acid according to the third step of claim 1, wherein: 5 percent of fly ash and 0.1 percent of hydrogen peroxide are added in the process of hot-melt pulp preparation to decolor the boric acid.

5. The process for preparing boric acid according to the fifth step of claim 1, wherein: the steam heating is to control the heating temperature below 90 ℃.

Technical Field

The invention relates to the technical field of chemical industry, in particular to a manufacturing process of boric acid.

Background

Boric acid is a hydrate of boron oxide (B)₂O₃.3H₂O), boric acid is white powdery crystal or triclinic scaly gloss crystal, has greasy feeling and no odor, is weakly acidic when dissolved in water, alcohol, glycerol, ethers and essential oil, and is widely used for glass (optical glass, acid-resistant glass, heat-resistant glass and glass for insulating materialsFiber) industry, can improve the heat resistance and the transparency of glass products, improve the mechanical strength and shorten the melting time.

The prior art has the following defects and shortcomings:

at present, boric acid is produced by a multi-purpose petrochemical method, the cost is higher, byproducts are excessive, the yield is low, and the purity is low.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a preparation process of boric acid, which can solve the problems of high cost, excessive byproducts, low yield and low purity of the boric acid produced by the existing multipurpose petrochemical method; the invention has the advantages of low manufacturing cost, few byproducts, high yield and high finished product purity by arranging the manufacturing process of the boric acid, and effectively solves the problems in the prior art.

In order to achieve the purpose of the manufacturing process of the boric acid, the invention provides the following technical scheme: a process for preparing boric acid includes such steps as providing a substrate,

firstly, washing boron slag, adding saturated boric acid mother liquor into crude boron slag in a workshop, enabling partial impurities such as magnesium chloride, magnesium sulfate and the like to enter a liquid phase, and separating partial impurities;

secondly, hot-melt filtration, namely adding fresh water and partially saturated boric acid mother liquor into the washed crude boron slag and heating to ensure that all boric acid enters a liquid phase to separate water-insoluble impurities;

step three, cooling crystallization, namely cooling the hot boric acid mother liquor to normal temperature through a vacuum crystallizer to separate boric acid out of a solid phase from the mother liquor, and separating to obtain crude boric acid;

fourthly, washing boric acid, namely adding purified water into the crude boric acid to ensure that a small amount of impurities such as magnesium chloride, magnesium sulfate and the like carried in the crude boric acid enter a liquid phase to achieve the aim of purifying the boric acid and obtain wet boric acid;

and fifthly, drying and packaging, dehydrating the wet boric acid through steam heating, and packaging to obtain a boric acid product.

Preferably, the saturated boric acid mother liquor added in the first step is generally cold mother liquor of a cooling crystallization section.

Preferably, the heating in the second step is carried out until the boiling point is 95-100 ℃.

Preferably, in the third step, 5% of fly ash and 0.1% of hydrogen peroxide are added in the process of hot-melt pulp preparation to decolor the boric acid.

Preferably, the steam heating in the fifth step is to control the heating temperature below 90 ℃.

Compared with the prior art, the invention provides a preparation process of boric acid, which has the following beneficial effects:

the preparation process of the boric acid has the advantages of simple preparation process, low preparation cost, less byproducts, high yield and high purity of the prepared boric acid.

Drawings

FIG. 1 is a schematic view of the flow structure of the present invention;

FIG. 2 is a schematic view of the overall flow structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the 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.

Referring to fig. 1-2, a process for preparing boric acid includes the following steps of S1, washing boron slag, adding saturated boric acid mother liquor (generally, cold mother liquor in a cooling crystallization section) into crude boron slag in a workshop, allowing part of impurities such as magnesium chloride and magnesium sulfate to enter a liquid phase, and separating part of impurities; s2, hot-melt filtering, adding fresh water and a part of saturated boric acid mother liquor into the washed crude boron slag, heating (to a boiling point of 95-100 ℃) to enable all boric acid to enter a liquid phase, and separating water-insoluble impurities; s3, cooling and crystallizing, cooling the hot boric acid mother liquor to normal temperature through a vacuum crystallizer, separating the boric acid from the mother liquor to obtain a solid phase, and separating to obtain crude boric acid; 5 percent of fly ash and 0.1 percent of hydrogen peroxide are added in the process of hot-melt pulp preparation, so as to achieve the aim of decoloring the boric acid; s4, washing boric acid, adding purified water into the crude boric acid to enable a small amount of impurities such as magnesium chloride, magnesium sulfate and the like carried in the crude boric acid to enter a liquid phase, so as to achieve the aim of purifying the boric acid and obtain wet boric acid; s5, drying and packaging, dehydrating the wet boric acid by steam heating (the heating temperature is controlled below 90 ℃) and packaging to obtain the boric acid product.

The working use flow and the installation method of the invention are that when the manufacturing process of the boric acid is used, the manufacturing process is simple, the manufacturing cost is low, the byproducts are few, the yield is high, and the purity of the prepared boric acid is high.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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.