阅读说明：本技术 一种陶瓷原料除铁增白方法 (Ceramic raw material iron-removing whitening method ) 是由 吴世斌 杨君之 何林耗 张家华 黄晓玲 于 2020-04-01 设计创作，主要内容包括：本发明涉及一种陶瓷原料除铁增白方法,所述方法包括以下步骤：(1)将陶瓷原料粉碎球磨,过筛并加水配制成浆料；(2)采用物理除铁法对浆料进行初步除铁；(3)加入解离药剂并用酸调节pH值,搅拌均匀,使得浆料中包裹的铁溶出,然后采用物理除铁法对浆料再次除铁；(4)加入除铁药剂,搅拌均匀,水洗数次,最后固液分离,固体压榨晾干,即得除铁增白后的陶瓷。本发明通过化学解离的作用,能将包裹磁性铁和非磁性铁打开,提高了后续物理除铁和化学除铁的效率；通过物理除铁、化学解离和化学除铁三者协同作用,能将陶瓷原料中的大部分铁去除,铁去除率高,原料增白效果明显。(The invention relates to a method for removing iron and whitening ceramic raw materials, which comprises the following steps: (1) grinding and ball-milling the ceramic raw materials, sieving and adding water to prepare slurry; (2) carrying out preliminary iron removal on the slurry by adopting a physical iron removal method; (3) adding a dissociation agent, adjusting the pH value with acid, uniformly stirring to dissolve out iron wrapped in the slurry, and then removing iron again from the slurry by adopting a physical iron removal method; (4) adding an iron removal agent, stirring uniformly, washing for a plurality of times, finally carrying out solid-liquid separation, squeezing and airing the solid to obtain the iron-removed and whitened ceramic. According to the invention, the coated magnetic iron and non-magnetic iron can be opened under the action of chemical dissociation, so that the subsequent physical iron removal efficiency and chemical iron removal efficiency are improved; through the synergistic effect of physical iron removal, chemical dissociation and chemical iron removal, most of iron in the ceramic raw material can be removed, the iron removal rate is high, and the whitening effect of the raw material is obvious.)

1. A ceramic raw material iron-removing and whitening method is characterized by comprising the following steps:

(1) grinding and ball-milling the ceramic raw materials, sieving and adding water to prepare slurry;

(2) carrying out preliminary iron removal on the slurry by adopting a physical iron removal method;

(3) adding a dissociation agent, adjusting the pH value with acid, uniformly stirring to dissolve out iron wrapped in the slurry, and then removing iron again from the slurry by adopting a physical iron removal method;

(4) adding an iron removal agent, stirring uniformly, washing for a plurality of times, finally carrying out solid-liquid separation, squeezing and airing the solid to obtain the iron-removed and whitened ceramic.

2. The method according to claim 1, wherein in the step (1), the mass fraction of the ceramic raw material in the slurry is 10% to 30%.

3. The method as claimed in claim 1, wherein in the step (2), the physical iron removal method is to remove iron by using a permanent magnet, an electromagnetic machine or other magnetic devices, and the iron is removed initially until the substances cannot be sucked out.

4. The method of claim 1, wherein in step (3), the dissociating agent is at least one of sodium hyposulfite and hydrogen peroxide.

5. The method according to claim 1, wherein in the step (3), the dissociating agent is used in an amount of 1-5% by mass of the slurry.

6. The method according to claim 1, wherein in the step (3), the pH is adjusted to 3-6, and the acid is at least one of dilute nitric acid, dilute hydrochloric acid and dilute sulfuric acid.

7. The method as claimed in claim 1, wherein in the step (3), the physical iron removal method is to remove iron by using a permanent magnet, an electromagnetic machine or other magnetic devices, and the iron is removed initially until the substances cannot be sucked out.

8. The method of claim 1, wherein in the step (4), the iron removing agent is at least one of oxalic acid, an iron complexing agent and citric acid.

9. The method of claim 1, wherein in the step (4), the iron removing agent is used in an amount of 0.5-2% by mass of the slurry.

10. The method as claimed in claim 1, wherein in the step (4), the water washing operation is: naturally settling, removing supernatant, washing the solid with water, and repeating for several times until the supernatant is iron-free.

Technical Field

The invention relates to a method for removing iron and whitening ceramic raw materials, belonging to the technical field of ceramics.

Background

The raw materials are the foundation of the ceramic industry, and due to the rapid development of the ceramic industry in the last two decades, a large amount of high-quality raw materials are developed and utilized, and the non-renewable characteristic of the raw materials, the shortage of the high-quality raw materials is increasingly prominent in the ceramic industry.

The research on the availability of the inferior raw materials is carried out, and some research progresses are carried out at present. The method is mainly used for removing iron from poor raw materials, but in practical application, the raw materials are mainly removed by physical methods such as large-scale strong magnetic equipment, and the like, so that only the part of iron which is exposed and has magnetism in the raw materials can be removed, and non-magnetic iron and coated iron cannot be removed.

Aiming at the research background, the invention provides a method combining physical removal, chemical dissociation and chemical removal for ceramic raw materials to comprehensively remove iron, so as to achieve higher removal rate.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the method for removing iron and whitening the ceramic raw material, which can achieve higher removal rate.

In order to achieve the purpose, the invention adopts the technical scheme that: a method for removing iron and whitening ceramic raw materials comprises the following steps:

(1) grinding and ball-milling the ceramic raw materials, sieving and adding water to prepare slurry;

(2) carrying out preliminary iron removal on the slurry by adopting a physical iron removal method;

(3) adding a dissociation agent, adjusting the pH value with acid, uniformly stirring to dissolve out iron wrapped in the slurry, and then removing iron again from the slurry by adopting a physical iron removal method;

(4) adding an iron removal agent, stirring uniformly, washing for a plurality of times, finally carrying out solid-liquid separation, squeezing and airing the solid to obtain the iron-removed and whitened ceramic.

In the method, the alkali is added into the liquid subjected to solid-liquid separation to recover the iron source, and the iron obtained by physical iron removal in the previous process can be recovered, so that the comprehensive utilization of resources is realized.

In a preferred embodiment of the method of the present invention, in the step (1), the mass fraction of the ceramic starting material in the slurry is 10% to 30%.

As a preferred embodiment of the method of the present invention, in the step (2), the physical deferrization method is to utilize a permanent magnet, an electromagnetic machine or other magnetic equipment to remove iron, and the iron is primarily removed until the substances cannot be sucked out.

In a preferred embodiment of the method of the present invention, in the step (3), the dissociation reagent is at least one of sodium hyposulfite and hydrogen peroxide.

In a preferred embodiment of the method of the present invention, in the step (3), the amount of the dissociation agent is 1% to 5% by mass of the slurry.

In a preferred embodiment of the method of the present invention, in the step (3), the pH is adjusted to 3 to 6, and the acid is at least one of dilute nitric acid, dilute hydrochloric acid, and dilute sulfuric acid.

As a preferred embodiment of the method of the present invention, in the step (3), the physical deferrization method is to utilize a permanent magnet, an electromagnetic machine or other magnetic equipment to remove iron, and the iron is primarily removed until the substances cannot be sucked out.

In a preferred embodiment of the method of the present invention, in the step (4), the iron removing agent is at least one of oxalic acid, an iron complexing agent, and citric acid.

In a preferred embodiment of the method of the present invention, in the step (4), the amount of the iron removing agent is 0.5% to 2% by mass of the slurry.

As a preferred embodiment of the method of the present invention, in the step (4), the water washing operation is: naturally settling, removing supernatant, washing the solid with water, and repeating for several times until the supernatant is iron-free.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the coated magnetic iron and non-magnetic iron can be opened under the action of chemical dissociation, so that the subsequent physical iron removal efficiency and chemical iron removal efficiency are improved; through the synergistic effect of physical iron removal, chemical dissociation and chemical iron removal, most of iron in the ceramic raw material can be removed, the iron removal rate is high, and the whitening effect of the raw material is obvious. The invention realizes changing waste into valuable, can collect and recycle iron serving as impurities in the ceramic raw materials, and is applied to the application occasions of the iron source with high added value.

Drawings

FIG. 1 is a technical scheme of the iron-removing and whitening method of the ceramic raw material.

FIG. 2 is a graph showing a comparison of whiteness of the ceramic starting material before and after iron removal in example 1, wherein the left side shows the ceramic starting material before iron removal, and the right side shows the ceramic starting material after iron removal.

FIG. 3 is a graph showing the comparison of whiteness of the ceramic starting material before and after iron removal in example 2, wherein the left side is the ceramic starting material before iron removal and the right side is the ceramic starting material after iron removal.

FIG. 4 is a graph showing a comparison of whiteness of the ceramic starting material before and after iron removal in example 3, wherein the left side shows the ceramic starting material before iron removal, and the right side shows the ceramic starting material after iron removal.

Fig. 5 is a graph showing a comparison of whiteness before and after iron removal of the ceramic raw material in comparative example 1, in which the left side is the ceramic raw material before iron removal and the right side is the ceramic raw material after iron removal.

Fig. 6 is a graph showing a comparison of whiteness before and after iron removal of the ceramic raw material in comparative example 2, in which the left side is the ceramic raw material before iron removal and the right side is the ceramic raw material after iron removal.

Fig. 7 is a graph showing a comparison of whiteness before and after iron removal of the ceramic raw material in comparative example 3, wherein the left side is the ceramic raw material before iron removal, and the right side is the ceramic raw material after iron removal.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.

The technical scheme of the iron removal and whitening method of the ceramic raw material is shown in figure 1.