阅读说明：本技术 一种用于制备重油催化裂化催化剂高岭土及其制备方法 (Kaolin for preparing heavy oil catalytic cracking catalyst and preparation method thereof ) 是由 杨龙和 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种用于制备重油催化裂化催化剂高岭土及其制备方法,属于高岭土制备技术领域。其技术要点包括如下步骤：S1、采掘松化高岭土矿料,初步分离出粘土、杂物后,获得高岭土基料,对高岭土基料除砂后制浆,获得高岭土矿浆初料；S2、取100-120份高岭土矿浆初料,向高岭土矿浆初料内加入0.5-0.8份分散剂,然后调节浆液的pH值至6-7；S3、向储浆罐内加入0.65-0.9份连二亚硫酸钠,反应25-40min后,向储浆罐内加入1.2-1.5份无机酸,搅拌均匀,制得高岭土矿浆精料；S4、将高岭土矿浆精料通入剥片机内进行剥片,再经过压滤脱水,得到滤饼；S5、滤饼在干燥后,进行破碎,即得成品,具有提高高岭土的比表面积与孔径的优点。(The invention discloses kaolin for preparing a heavy oil catalytic cracking catalyst and a preparation method thereof, belonging to the technical field of kaolin preparation. The technical key points comprise the following steps: s1, excavating and loosening kaolin mineral aggregate, primarily separating clay and impurities to obtain a kaolin base material, degritting the kaolin base material, and pulping to obtain a kaolin ore pulp primary material; s2, taking 100-120 parts of kaolin ore pulp primary material, adding 0.5-0.8 part of dispersing agent into the kaolin ore pulp primary material, and then adjusting the pH value of the slurry to 6-7; s3, adding 0.65-0.9 part of sodium hydrosulfite into a slurry storage tank, reacting for 25-40min, adding 1.2-1.5 parts of inorganic acid into the slurry storage tank, and uniformly stirring to obtain kaolin ore pulp concentrate; s4, introducing the kaolin ore pulp concentrate into a stripping machine for stripping, and performing filter pressing and dehydration to obtain a filter cake; and S5, drying the filter cake, and crushing to obtain the finished product, wherein the finished product has the advantages of improving the specific surface area and the pore diameter of the kaolin.)

1. The preparation method of the kaolin used for preparing the heavy oil catalytic cracking catalyst is characterized by comprising the following steps:

s1, excavating and loosening kaolin mineral aggregate, primarily separating clay and impurities to obtain a kaolin base material, degritting the kaolin base material, and pulping to obtain a kaolin ore pulp primary material;

s2, taking 100-120 parts of kaolin ore pulp primary material, adding 0.5-0.8 part of dispersing agent into the kaolin ore pulp primary material, and then adjusting the pH value of the slurry to 6-7;

s3, adding 0.65-0.9 part of sodium hydrosulfite into the slurry, reacting for 25-40min, adding 1.2-1.5 parts of inorganic acid into the slurry, and uniformly stirring to obtain kaolin ore pulp concentrate;

s4, introducing the kaolin ore pulp concentrate into a stripping machine for stripping, and performing filter pressing and dehydration to obtain a filter cake;

and S5, drying the filter cake, and crushing to obtain the finished product.

2. The method for preparing kaolin as a catalyst for catalytic cracking of heavy oil according to claim 1, wherein the dispersant is a mixed solution of sodium hexametaphosphate solution and sodium silicate, and the weight ratio of the sodium hexametaphosphate solution to the sodium silicate is 1: 2.5-4.

3. The method for preparing kaolin, a catalyst for catalytic cracking of heavy oil, as claimed in claim 1, wherein the inorganic acid is one or more of hydrochloric acid, nitric acid, sulfuric acid and phosphoric acid.

4. The method for preparing kaolin as a catalyst for catalytic cracking of heavy oil according to claim 1, wherein the inorganic acid in S3 is replaced by an organic acid in equal parts by weight, and the organic acid is one or more of lactic acid, malic acid, oxalic acid or citric acid.

5. The method for preparing kaolin, which is a catalyst for catalytic cracking of heavy oil, according to claim 1, wherein the pH of the slurry in S2 is adjusted by adding magnesium chloride.

6. The method for preparing kaolin, which is a catalyst for catalytic cracking of heavy oil, according to claim 1, wherein 0.2 to 0.3 parts of sodium chloride is further added to the S2.

7. The method for preparing kaolin, which is a catalyst for catalytic cracking of heavy oil, according to claim 1, wherein the filter cake in S4 is made into a brick.

8. A kaolin clay for preparing a heavy oil catalytic cracking catalyst, which is prepared by the method for preparing the kaolin clay for preparing the heavy oil catalytic cracking catalyst according to any one of claims 1 to 7.

Technical Field

The invention belongs to the technical field of kaolin preparation, and particularly relates to kaolin for preparing a heavy oil catalytic cracking catalyst and a preparation method thereof.

Background

Kaolin is one of the production raw materials used in the petrochemical industry to prepare catalysts for catalytic cracking of heavy oil. The kaolin is clay and claystone with kaolinite group clay mineral as main component, and its mineral components mainly include kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals.

The Chinese patent with the publication number of CN101798096B discloses a method for preparing kaolin, which comprises the following steps: mining to remove impurities, excavating kaolin mineral aggregate, and primarily separating clay and impurities to obtain a base material; pulping and desanding, namely pulping the base material and desanding to obtain an ore pulp primary material; chemical bleaching, conveying the primary ore pulp material into a high-speed stirring tank for pulp storage, adding a sulfuric acid solution and a sodium dithionite solution, wherein the mass ratio of the sulfuric acid solution to the primary ore pulp material is 0.3: 100-0.8: 100, the mass ratio of the sodium dithionite solution to the primary kaolin ore pulp material is 0.6: 100-1.0: 100, adjusting the pH value of the mixed solution to be 2.0-3.0, and stirring at the speed of 140-180 r/min for 40-45 min to obtain a refined ore pulp material; washing and dehydrating, namely circularly washing and dehydrating the concentrated ore pulp to obtain final ore pulp; drying and pulverizing, namely performing filter pressing and dehydration on the ore pulp final material to obtain a kaolin filter cake, drying the kaolin filter cake, crushing and collecting to obtain a kaolin finished product. In the prior art, the preparation of kaolin is generally carried out by adopting the technical scheme.

However, the above-described solutions produce kaolin having a small specific surface area and pores, resulting in a low number of active centers, which has a limited ability to crack petroleum molecules.

Therefore, a new solution is needed to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide kaolin for preparing a heavy oil catalytic cracking catalyst, which has the advantages of improving the specific surface area and the pore diameter of the kaolin.

The second objective of the present invention is to provide a method for preparing kaolin used for preparing a heavy oil catalytic cracking catalyst, which is used for preparing the kaolin used for preparing the heavy oil catalytic cracking catalyst.

In order to achieve the first purpose, the invention provides the following technical scheme:

the preparation method of the kaolin used for preparing the heavy oil catalytic cracking catalyst is characterized by comprising the following steps:

s1, excavating and loosening kaolin mineral aggregate, primarily separating clay and impurities to obtain a kaolin base material, degritting the kaolin base material, and pulping to obtain a kaolin ore pulp primary material;

s2, taking 100-120 parts of kaolin ore pulp primary material, adding 0.5-0.8 part of dispersing agent into the kaolin ore pulp primary material, and then adjusting the pH value of the slurry to 6-7;

s3, adding 0.65-0.9 part of sodium hydrosulfite into the slurry, reacting for 25-40min, adding 1.2-1.5 parts of inorganic acid into the slurry, and uniformly stirring to obtain kaolin ore pulp concentrate;

s4, introducing the kaolin ore pulp concentrate into a stripping machine for stripping, and performing filter pressing and dehydration to obtain a filter cake;

and S5, drying the filter cake, and crushing to obtain the finished product.

By adopting the technical scheme, the kaolin mineral aggregate is subjected to desanding and then is subjected to pulping, then the dispersant is added into the slurry, the pH value of the slurry is adjusted to 6-7, the sodium hydrosulfite is added to achieve a bleaching effect, then the organic acid is added, and the organic acid can be added into micropores of the kaolin to corrode the micropores, so that the pores on the kaolin are enlarged, the purpose of enlarging the pore diameter of the kaolin is achieved, and the specific surface area of the kaolin is improved.

More preferably, the dispersing agent is a mixed solution of a sodium hexametaphosphate solution and sodium silicate, and the weight part ratio of the sodium hexametaphosphate solution to the sodium silicate is 1: 2.5-4.

By adopting the technical scheme, the dispersing agent is added into the slurry, so that the dispersing agent is adsorbed on the surface of the particles, and the property of the surface of the particles is changed, thereby changing the interaction force between the particles and water, and between the particles, so that the particles have stronger repulsive force, and the flocculation time of the slurry is prolonged.

Further preferably, the inorganic acid is one or more of hydrochloric acid, nitric acid, sulfuric acid and phosphoric acid.

More preferably, the inorganic acid is sulfuric acid.

By adopting the technical scheme, when the inorganic acid is sulfuric acid, high-valence iron can be prevented from being mixed in the slurry, the whiteness of the kaolin is improved, and the pores of the kaolin can be enlarged under the corrosion action of the sulfuric acid.

More preferably, the inorganic acid in the S3 is replaced by organic acid with equal weight parts, and the organic acid is one or more of lactic acid, malic acid, oxalic acid or citric acid.

By adopting the technical scheme, the organic acid is dissolved in the slurry, can release protons, and reacts with aluminum in the kaolin to form exchanged aluminum, so that the kaolin is corroded, and the pores are enlarged.

More preferably, oxalic acid is used as the organic acid.

More preferably, in S2, the pH of the slurry is adjusted by adding magnesium chloride.

By adopting the technical scheme, the addition of the magnesium chloride can not only adjust the pH value of the slurry, but also introduce Cl into the slurry^－Due to Cl^－The radius is small, the penetrating power is strong, the corrosion of acid to the kaolin can be accelerated, and the production efficiency of the product is improved.

More preferably, 0.2 to 0.3 part of sodium chloride is further added to the S2.

By adopting the technical scheme, a small amount of solid sodium chloride powder is added in the reaction process of the slurry and the sulfuric acid, because Cl^－The radius is small, the penetrating power is strong, so the small pore is easy to penetrate, the pore reaches the surface of the kaolin, the inner wall of the pore is corroded, the reaction rate is accelerated, and the production efficiency of the product is improved.

More preferably, the filter cake in S4 is made into a brick.

By adopting the technical scheme, when the yield of the kaolin is high, the filter cakes are piled together for air drying, and the filter cake in the central part needs longer air drying time; after making the filter cake into the brick body, can be convenient for the staff to carry, stack the filter cake, can avoid the filter cake to pile up together and influence the air-dry speed of filter cake simultaneously.

In order to achieve the second purpose, the invention provides the following technical scheme:

the kaolin for preparing the heavy oil catalytic cracking catalyst is prepared by the preparation method for preparing the kaolin for preparing the heavy oil catalytic cracking catalyst.

By adopting the technical scheme, the kaolin used for preparing the heavy oil catalytic cracking catalyst has larger aperture and specific surface area, and can be suitable for the catalytic cracking of heavy oil.

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) firstly, desanding kaolin mineral aggregate, pulping, then adding a dispersant into the slurry, adjusting the pH value of the slurry to 6-7, adding sodium hydrosulfite to play a bleaching effect, then adding an organic acid, wherein the organic acid can be added into micropores of the kaolin to corrode the micropores on the kaolin, so that pores on the kaolin are enlarged, the purpose of enlarging the pore diameter of the kaolin is achieved, and the specific surface area of the kaolin is improved;

(2) by adding the magnesium chloride, the pH value of the slurry can be adjusted, and Cl can be introduced into the slurry^－Due to Cl^－The radius is small, the penetrating power is strong, the corrosion of acid to the kaolin can be accelerated, and the production efficiency of the product is improved;

(3) when the yield of the kaolin is larger, the filter cakes are piled together for air drying, and the filter cake in the central part needs longer air drying time; after making the filter cake into the brick body, can be convenient for the staff to carry, stack the filter cake, can avoid the filter cake to pile up together and influence the air-dry speed of filter cake simultaneously.

Detailed Description

The present invention will be described in further detail with reference to examples.

In the following examples and comparative examples:

the sodium hexametaphosphate is sodium hexametaphosphate produced by eastern Bai chemical Co., Ltd, Suzhou;

the sodium silicate is produced by Shijiazhuang Hengruid science and technology limited;

the magnesium chloride is produced by Weifang Yuding chemical Limited company;

the sodium hydrosulfite is produced by Hunan province silver bridge science and technology limited company;

hydrochloric acid, nitric acid, sulfuric acid and phosphoric acid commercially available sulfuric acid, hydrochloric acid and nitric acid are used.