CN117819562A

CN117819562A - A process for extracting boric acid from wastewater

Info

Publication number: CN117819562A
Application number: CN202410015154.1A
Authority: CN
Inventors: 刘鸿; 胡庆华; 朱炜烽
Original assignee: Guizhou Jinghe Chemical Industry Co ltd
Current assignee: Guizhou Jinghe Chemical Industry Co ltd
Priority date: 2024-01-05
Filing date: 2024-01-05
Publication date: 2024-04-05

Abstract

本发明属于废水净化循环利用技术领域，具体涉及一种废水中硼酸的提取工艺，所述工艺包括通过物理方法提取硼酸步骤。本发明利用物理方法将硼酸从废水中提取出来，回用于生产中，将大大的节省原辅材料的消耗，降低成本，同时废水经过提取掉硼酸，废水中的杂质少，更容易进行处理，缩短环保处理的时间，操作步骤简单，绿色环保，经济效益显著。The invention belongs to the technical field of wastewater purification and recycling, and specifically relates to a process for extracting boric acid from wastewater, wherein the process comprises a step of extracting boric acid by a physical method. The invention utilizes a physical method to extract boric acid from wastewater, and reuses the boric acid in production, which greatly saves the consumption of raw and auxiliary materials and reduces costs. Meanwhile, after the boric acid is extracted from the wastewater, the impurities in the wastewater are less, and the wastewater is easier to process, shortening the time of environmental protection treatment, and having simple operation steps, green environmental protection, and significant economic benefits.

Description

Extraction process of boric acid in wastewater

Technical Field

The invention relates to the technical field of wastewater purification and recycling, in particular to an extraction process of boric acid in wastewater.

Background

Boron is an important industrial raw material, has wide application in the fields of glass, ceramics, medicines, fertilizers, textiles and the like, and 15% of domestic boron in China is extracted from salt lakes. Currently, the main methods for extracting boron from salt lakes are extraction and acidification precipitation. Wherein, the extraction method relies on an organic extractant to extract boron from salt lakes on a large scale, has higher cost and is easy to cause secondary pollution. The acidification precipitation method is to add inorganic acid such as hydrochloric acid, sulfuric acid and the like into salt lake brine to convert boron into indissolvable boric acid or borate for precipitation to obtain a primary product, and then dissolve the primary product by the inorganic acid, and cool and crystallize the primary product to obtain the boric acid product.

Energy conservation and environmental protection are two important concerns in the world today, and therefore, efficient, new, green, environmental protection products have become one of the key directions of research by scientists in various countries. The waste water in dye industry is widely accepted industrial waste water which is difficult to treat because the catalyst in the dye waste water does not participate in the reaction, the catalyst is all in the waste water after the reaction is finished, the ratio of the catalyst in the waste water reaches 50000 PPM, and the waste water contains excessive raw materials which are easy to sublimate. Therefore, the waste water has a plurality of impurities and is difficult to treat. And the catalyst such as boric acid is extracted from seawater or boron ore, so that the extraction technology is complex, pollution is large, and the catalyst is not renewable.

The existing dye wastewater treatment method has the defects that boric acid is simply adsorbed by active carbon and then is used as hazardous waste to be treated, and wastewater is subjected to biochemical treatment, so that the environmental protection treatment difficulty is high, the raw material consumption is high, and the like. For the related art problems, no solution has been proposed yet.

Disclosure of Invention

Aiming at the problems in the related art, the invention provides the extraction process of the boric acid in the wastewater, which aims to solve the technical problems in the prior art, and the invention aims to extract the boric acid from the wastewater by using a physical method, recycle the boric acid in production, greatly save the consumption of raw and auxiliary materials, and simultaneously, the wastewater is subjected to catalyst and raw and auxiliary materials extraction, so that the impurities in the wastewater are less and the wastewater is easier to treat.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the invention provides an extraction process of boric acid in wastewater, which comprises the following steps:

step one: adsorbing impurities in the wastewater containing sulfuric acid after filter pressing by using activated carbon;

step two: filtering and pressing the activated carbon after adsorbing impurities by using a filter press;

step three: concentrating the wastewater solution containing 19% sulfuric acid after the adsorption of the activated carbon to wastewater containing 30% sulfuric acid;

step four: cooling 30% sulfuric acid wastewater in the third step to 20 ℃, and entering a centrifugal machine for centrifugal washing;

step five: the solid after centrifugal washing in the step four enters a drying bed for drying, and then is packaged for recycling;

step six: and (3) the water containing 30% sulfuric acid after centrifugal washing is neutralized and centrifuged, and the water can be recycled in a production workshop.

Preferably, in the fifth step, the drying temperature is 112-116 ℃.

Preferably, in the first step, the content of the sulfuric acid is 19%.

Compared with the prior art, the invention has the beneficial effects that:

the invention is an extraction process of catalyst in waste water, the invention only needs the physical method, the operation steps are simple and safe, no other chemicals are added, no new pollutants are added, and the extracted raw materials and auxiliary materials are all recycled, therefore, the invention has the advantages of simple industry, less energy consumption, low cost, high purity of boric acid prepared by the method, reduced hazardous waste amount and all extracted hazardous waste for production.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

step one: adsorbing impurities in the wastewater containing sulfuric acid after filter pressing by using activated carbon; the content of the sulfuric acid is 19%;

step five: the solid after centrifugal washing in the step four enters a drying bed for drying, and then is packaged for recycling; the drying temperature is 116 ℃;

Example 2

step five: the solid after centrifugal washing in the step four enters a drying bed for drying, and then is packaged for recycling; the drying temperature is 114 ℃;

Example 3

step five: the solid after centrifugal washing in the step four enters a drying bed for drying, and then is packaged for recycling; the drying temperature is 115 ℃;

Example 4

Example 5

step five: the solid after centrifugal washing in the step four enters a drying bed for drying, and then is packaged for recycling; the drying temperature is 112 ℃;

Example 6

The boric acid extraction amount and the hazardous waste reduction amount of examples 1 to 6 are shown in table 1.

TABLE 1

The invention only needs a physical method, has simple and safe operation, does not increase other chemicals or new pollutants, and fully recycles the extracted raw materials and auxiliary materials, so the invention has simple industry, less energy consumption and low cost, the prepared boric acid has high purity, the dangerous waste amount is reduced, and the reduced dangerous waste is fully extracted for production.

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

Claims

1. A process for extracting boric acid from wastewater, characterized in that it comprises the following steps:

Step 1: Use activated carbon to absorb impurities in the wastewater containing sulfuric acid after pressure filtration;

Step 2: Use a filter press to filter out the activated carbon after adsorbing impurities;

Step 3: Concentrate the 19% sulfuric acid wastewater solution after activated carbon adsorption to 30% sulfuric acid wastewater;

Step 4: Cool the 30% sulfuric acid wastewater in step 3 to 20°C and centrifuge it for washing;

Step 5: The solids after centrifugal washing in step 4 are placed in a drying bed for drying, and then packaged for reuse;

Step 6: The water containing 20% sulfuric acid after centrifugal washing will be reused in the production workshop after neutralization and centrifugation.

2. The process for extracting boric acid from wastewater according to claim 1, characterized in that in step 5, the drying temperature is 112-116°C.

3. The process for extracting boric acid from wastewater according to claim 1, characterized in that in step 1, the content of sulfuric acid is 19%.