阅读说明：本技术 一种云母纸废料的回收利用方法 (Recycling method of mica paper waste ) 是由 董丁炉 于 2020-05-06 设计创作，主要内容包括：本发明公开了一种云母纸废料的回收利用方法,其利用云母纸生产线上获得的边角余料、废弃料或者残损料作为原料,依次进行除杂和加强碱浸泡预开解操作,并在后浸泡预开解后利用超声辅助进行打浆并调浆,然后在浆液中再次加强碱以及分散剂进行二次浸泡开解,然后利用铝盐絮凝,并将絮凝物洗涤并烘干后进行强磁磁选,将磁选后的富集料利用捕收剂在起泡剂的辅助下进行扫选捕收,其捕收物冲洗并烘干后得到回收云母粉,回收云母粉和新制云母粉比例混合后即可进行云母纸的抄造。本发明的方法可有效提高云母纸废料的利用率,并保证抄造后再生云母纸新纸的性能接近于传统工艺下制得的新浆云母纸。(The invention discloses a recycling method of mica paper waste, which uses leftover materials, waste materials or residual materials obtained on a mica paper production line as raw materials, sequentially carries out impurity removal and alkali-enhanced soaking pre-decomposition operations, uses ultrasonic assistance to carry out pulping and size mixing after the post-soaking pre-decomposition, then uses alkali and a dispersing agent to carry out secondary soaking decomposition again in a slurry, then uses aluminum salt to flocculate, washes and dries the flocculate, carries out strong magnetic separation, carries out scavenging and collecting on the enriched materials after the magnetic separation with the aid of a foaming agent, washes and dries the collected materials to obtain recycled mica powder, and carries out papermaking of the mica paper after the recycled mica powder is mixed with new mica powder in proportion. The method can effectively improve the utilization rate of the mica paper waste and ensure that the performance of the new recycled mica paper after papermaking is close to that of the new pulp mica paper prepared by the traditional process.)

1. The recycling method of the mica paper waste is characterized by comprising the following operation steps:

1) collecting mica paper waste serving as a recovery raw material, removing impurities on the surface of the mica paper waste, shearing the mica paper waste, adding water, and soaking for pre-cracking by using strong base as a cracking agent for 35-50 h;

2) taking out the material subjected to soaking and pre-digestion, pulping, adding the material into another clean container after pulping, adding water for size mixing, controlling the concentration of the pulp to be 20-25%, adding strong base and a dispersing agent together for secondary soaking and digestion, wherein the soaking time is 15-20 h;

3) adding aluminum salt into the material slurry after the secondary soaking and decomposing, and aerating from the bottom of the slurry by utilizing an aeration device to continuously generate flocculate in the container;

4) when the flocculate is not generated any more in the step 3), taking out the flocculate, repeatedly washing and drying the flocculate, then carrying out strong magnetic separation on the dried material by using a magnetic separator, wherein the magnetic separation strength is 1-1.5T, so as to obtain mica enriched material and non-enriched material, adding water and resin acid into the enriched material, adjusting the pH value to 2.7-3.0, adding dodecylamine or a mixture of octadecylamine and oleic acid in a mass ratio of 1:1 as a collecting agent, carrying out scavenging in a flotation tank with the aid of a foaming agent, returning the scavenged foam product and non-enriched material to the step 2) for continuous circulation, taking out the content in the flotation tank, filtering, washing with running water, and drying the surface to obtain recovered mica powder;

5) and (4) mixing the corresponding recycled mica powder treated in the step (S4) with new mica powder with the same particle size range value according to the proportion of 1: 2-1: 3, pulping, and feeding into a mica paper sorting machine to make mica paper.

2. The method for recycling mica paper waste as set forth in claim 1, wherein the mica paper waste as the recycling raw material is cut into a size of 1.5cm in the cutting process in step S1²The following fragments.

3. The method of claim 1, wherein the strong base is NaOH or KOH.

4. The recycling method of mica paper waste according to claim 1, wherein the addition amount of the strong base in the soaking pre-opening process is 10-12 kg/t.

5. The recycling method of mica paper waste according to claim 1, characterized in that the amount of the strong base added in the secondary soaking and splitting process is 6-8 kg/t.

6. The recycling method of mica paper waste material as claimed in claim 1, wherein ultrasonic-assisted beating is adopted during beating treatment in step 2), and ultrasonic frequency is controlled to be 30 KHz-40 KHz, power is controlled to be 35-40 w, rotating speed of a beater is controlled to be 2000-3000 r/min, and beating time is 10-15 min.

7. The recycling method of mica paper waste according to claim 1, characterized in that the dispersant is sodium hexametaphosphate and the addition amount is 500-550 g/t.

8. The method of claim 1, wherein the aluminum salt is KAl (SO)₄)₂·12H₂O, the dosage is 150-300 g/t.

9. The recycling method of mica paper waste according to claim 1, characterized in that the addition amount of the collector is 70-80 g/t.

10. The method of claim 1, wherein the foaming agent is a terpineol oil or an etherol oil.

Technical Field

The invention relates to the technical field of recycling of mica paper products, in particular to a recycling method of mica paper waste.

Background

Mica paper products are one of the most extensive application approaches of the current mica, the mica paper products are prepared by pulping and papermaking by using crushed mica sheets crushed in a thermodynamic, chemical or hydraulic way and the like as raw materials, the mica paper often has most of the performances of the corresponding products of the sheet mica, and has uniform thickness, small dielectric strength fluctuation range and high and stable corona initial voltage, and the mica paper is widely used as insulating materials in cables and large-scale electromechanical equipment in industry. With the development of the electrical industry, the demand for mica is increasing. However, the mica resource is less and less, and especially the large-diameter flaky mica is less and less. An effective way to solve the contradiction is to improve the utilization rate of mica, such as the relative utilization rate of residual mica paper and waste materials.

There are two main types of production routes as mica paper waste:

in the process of manufacturing mica paper, a certain amount of unqualified waste materials or defective materials are usually inevitably generated due to processes, raw materials, equipment and the like, and even qualified mica paper products have a large amount of leftover materials in the cutting and forming process.

In the using process of the mica paper and the mica paper product, the mica paper and the mica paper product are consumed as consumables, and the mica paper product are also used as wastes along with the damage and the abandonment of related equipment.

Generally, the conventional treatment method of mica paper waste is to perform landfill treatment as industrial waste, which not only pollutes the environment, but also wastes mica resources, and direct recycling is also technically hindered, mainly because the two types of mica paper waste generally include mica paper products which are processed twice in a relatively high proportion, and because the mechanical strength of the mica paper made directly from mica is relatively low, the mica paper products can not be directly used, and adhesives and reinforcing materials are required to be used as auxiliary materials to make various mica paper products, so that the mica paper product waste generally contains resin materials (generally, epoxy resin or organic silicon resin compositions taking epoxy resin as a main component) and reinforcing fibers (generally, aramid fibers); because of the existence of the components, the mica paper product prepared by utilizing the recycled raw materials has poor quality and performance stability, and thus, mica production enterprises are not willing to recycle related product wastes.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a recycling method of mica paper waste to solve the above-mentioned defects in the technical background.

The technical problem solved by the invention is realized by adopting the following technical scheme:

a recycling method of mica paper waste specifically comprises the following operation steps:

1) collecting mica paper waste serving as a recovery raw material, removing impurities on the surface of the mica paper waste, shearing the mica paper waste, adding water, and soaking for pre-cracking by using strong base as a cracking agent for 35-50 h;

2) taking out the material subjected to soaking and pre-digestion, pulping, adding the material into another clean container after pulping, adding water for size mixing, controlling the concentration of the pulp to be 20-25%, adding strong base and a dispersing agent together for secondary soaking and digestion, wherein the soaking time is 15-20 h;

3) adding aluminum salt into the material slurry after the secondary soaking and decomposing, and aerating from the bottom of the slurry by utilizing an aeration device to continuously generate flocculate in the container;

4) when the flocculate is not generated any more in the step 3), taking out the flocculate, repeatedly washing and drying the flocculate, then carrying out strong magnetic separation on the dried material by using a magnetic separator, wherein the magnetic separation strength is 1-1.5T, so as to obtain mica enriched material and non-enriched material, adding water and resin acid into the enriched material, adjusting the pH value to 2.7-3.0, adding dodecylamine or a mixture of octadecylamine and oleic acid in a mass ratio of 1:1 as a collecting agent, carrying out scavenging in a flotation tank with the aid of a foaming agent, returning the scavenged foam product and non-enriched material to the step 2) for continuous circulation, taking out the content in the flotation tank, filtering, washing with running water, and drying the surface to obtain recovered mica powder;

5) and (4) mixing the corresponding recycled mica powder treated in the step (S4) with new mica powder with the same particle size range value according to the proportion of 1: 2-1: 3, pulping, and feeding into a mica paper sorting machine to make mica paper.

Further, in step S1, when the raw material is cut into pieces, the collected leftover, waste or damaged mica paper is cut into pieces with an area of 1.5cm²The following fragments are used to improve the opening speed and the opening rate of the mica paper waste.

The strong base is further limited to be NaOH or KOH, wherein the adding amount of the strong base in the soaking pre-digestion process is 10-12 kg/t, and the adding amount of the strong base in the secondary soaking digestion process is 6-8 kg/t.

As a further limitation, ultrasonic-assisted beating is adopted during beating in the step 2), the ultrasonic frequency is controlled to be 30 KHz-40 KHz, the power is controlled to be 35-40 w, the rotating speed of the beater is 2000-3000 r/min, and the beating time is 10-15 min.

The further limitation is that the dispersing agent is sodium hexametaphosphate, and the adding amount is 500-550 g/t.

As a further limitation, the aluminum salt is KAl (SO)₄)₂·12H₂O, the dosage is 150-300 g/t.

As a further limitation, the adding amount of the collecting agent is 70-80 g/t.

By way of further limitation, the frother is a terpineol oil or an etherol oil.

The method effectively utilizes the flocculation effect of aluminum salt and the magnetic separation effect of strong magnetism, firstly utilizes the cracking agent to crack the waste raw material, the dissolution rate and dissolution effect of the raw materials are improved by two times of dissolution, and the mica powder in the dispersed slurry system has small mass and is flaky, so that the mica micro powder is extremely easy to disperse in the slurry system to form suspended matters and is difficult to settle, and a large amount of aluminum hydroxide colloid can be formed in the slurry system by adding aluminum salt and matching with a large amount of bottom aeration, the aluminum hydroxide colloid is adsorbed on the surface of the mica sheet after the decomposition and continuously generates flocculate, the flocculate has good settleability and is convenient for centralized treatment to obtain mica powder separated from the resin material, however, the reinforcing fibers in the mica powder can be adsorbed with the aluminum hydroxide colloid, so that the separated mica powder still contains part of aluminum compounds, reinforcing fibers and a small amount of resin materials.

The mica mineral has weak magnetism, so that the mica mineral can be considered to be primarily enriched and recovered by adopting a strong magnetic separation process, then the enriched rough concentrate is reselected and concentrated, part of impurities are sieved out again to obtain the enriched aggregate, the proportion of mica in the enriched aggregate is further improved, but because a plurality of mica fine powders are charged in the preorder processing process, and because the mica fine powders with the same particle size have the same charge, under the general condition, the mica fine powders are mutually repelled and are not easy to aggregate and collect, and the addition of the resin hyaluronic acid can be used as a pH value indicator to ensure the working environment of the collecting agent on one hand, and can also react with hydroxyl on the surface of the mica to form a compatible structure on the surface of the mica powder on the other hand, so that good fluidity is maintained in the flotation process, and the mica mineral is more beneficial to being collected by the.

Has the advantages that: the method improves the opening rate of the mica paper by opening the sizing mica paper twice through the opening agent, effectively separates the reinforced fiber and the resin material by combining the flocculation process and the strong magnetic separation process, and improves the removal rate of the resin material and the reinforced fiber in the mica paper waste material to more than 90 percent;

by reasonably setting the collecting agent and controlling the collecting condition, the recovery rate of the cloud master batch is improved, the physical and chemical properties of the cloud master batch are not changed, the mica paper prepared by mixing with the fresh mica pulp has excellent tensile strength, tearing strength and dielectric breakdown strength, secondary processing can be carried out by matching with an adhesive and a reinforcing material, and the stability of the service performance of the mica paper is ensured.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the following examples, it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.