Kaolin for preparing heavy-oil catalytic cracking catalyst

Abstract

The invention discloses kaolin for preparing a heavy-oil catalytic cracking catalyst. Preparation comprises the steps: firstly, digging a Songhua kaolin mineral aggregate, and initially separating out clay and impurities, to obtain a kaolin base material, mixing the base material and a dispersant, slurrying, then removing sand, and thus obtaining a kaolin mineral slurry initial material; transporting the kaolin mineral slurry initial material to a slurry storage tank, stirring, adding an oxidant and a sodium hyposulfite solution, and carrying out chemical bleaching, to obtain a kaolin mineral slurry concentrate; washing the kaolin mineral slurry concentrate obtained through chemical bleaching, carrying out press filtration and dewatering, and thus obtaining a filter cake; and after the filter cake is dried, crushing, and thus obtaining the finished product. The kaolin has good dispersibility and stability, can meet requirements of a catalytic cracking device on catalyst physicochemical properties, and has lower production cost; and in a gelation process, the colloid gelation time is short, the product wear index is low, and the finally-obtained catalyst has better heavy oil conversion ability and heavy metal pollution resistant ability.

Description

technical field [0001] The invention relates to a kind of kaolin, in particular to a kind of kaolin used for preparing heavy oil catalytic cracking catalyst. Background technique [0002] Kaolin is one of the raw materials used in the petrochemical industry to prepare catalysts for catalytic cracking of heavy oil. Kaolin is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Its mineral composition is mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals. Pure kaolin is white and delicate, soft and soft, and has good physical and chemical properties such as plasticity and fire resistance. There are five major kaolin mines in my country: (1) Maoming kaolin (2) Longyan kaolin (3) Suzhou Yangshan kaolin (4) Hepu kaolin (5) North coal-measure kaolin. The chemical composition of Suzhou kaolin is very close to the theoretical composition of kaolinite, Al 2 o 3 The content can be as high as 39.0%...

AI Technical Summary

Problems solved by technology

The object of the present invention is to address above-mentioned deficiencies, provide a kind of kaolin that is used for catalytic cracking catalyst, this kind of kaolin is prepared according to the characteristics of existing Maoming kaolin mine, can solve the high viscosity of kaolin existing in the prior art, fluidity, Insufficient gel wear resistance