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Process for preparation of tuff filter aid

A filter aid and tuff technology, applied in the field of preparation of tuff filter aid, can solve the problems of lack of raw materials, poor filtering and clarifying effect, high price and the like

Inactive Publication Date: 2003-03-05
中国科学院长沙大地构造研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of tuff filter aid, which uses light porous tuff as raw material, the production process is simple, and the cost is low, so as to solve the shortage of raw materials, complex production process and high price of diatomite filter aid. , chemical stability is not ideal enough, and at the same time solve the problems of perlite filter aids such as lack of intragranular pores, poor compression resistance, poor filtration and clarification effect, single product variety, and narrow application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Use light tuff as raw material to prepare tuff filter aid products. The raw material used is hydrated rhyolitic vitreous tuff. The basic features are: (1) Appearance and basic physical properties: white, light off-white, light in weight and low in strength. It can be kneaded into powder by hand, with an average water content of 67.57%, and a loose bulk density of 0.54g / cm 3 , specific gravity 2.35g / cm 3 , The porosity is about 58%. (2) The chemical composition list is as follows:

[0040] Sample serial number

[0041] As shown in the table, due to the influence of later hydration, the loss on ignition increased significantly, while SiO 2 The content is reduced, and other components are similar to tuff and perlite. In addition, it has been determined that the content of harmful trace elements lead and arsenic is lower than the requirements for filter aids for food industry stipulated by the state. (3) Mineral composition: According to various methods such ...

Embodiment 4

[0052] Different types of tuff-perlite composite filter aid series products are prepared by using light tuff and expanded perlite as raw materials. The characteristics of the light tuff used and the preparation method of the tuff filter aid are the same as in Example 1, and the rest of the process features are the same as in Example 2. The formula adopted in this embodiment is: tuff filter aid 30-40wt%, perlite filter aid 70-60wt%. The tuff-perlite composite filter aid is obtained after fully mixing the weighed materials in this formula.

Embodiment 5

[0054] Different types of tuff-perlite composite filter aid series products are prepared by using light tuff and expanded perlite as raw materials. The characteristics of the light tuff used and the preparation method of the tuff filter aid are the same as in Example 1, and the rest of the process features are the same as in Example 2.

[0055] The formula adopted in this embodiment is: tuff filter aid 40-50wt%, perlite filter aid 60-50wt%. The tuff-perlite composite filter aid is obtained after fully mixing the weighed materials in this formula.

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PUM

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Abstract

The preparation method of tuff filter aid by using light porous tuff as raw material includes the following steps: crushing raw material whose water content is less than 30% and grain size of 95% of raw material is less than 74 micrometers (200 meshes), adopting hot air furnace or low-temp, drying rotary kiln to dry material for 50-70 min. at 290-310 deg.C; cleaning to remove grass root, sand and superfine clay, and the grain size of 90% of cleaned and separated material is less than 43 micrometers (325 meshes), roasting for 1-2 h. at 700-1000 deg.C, and pulverizing, the grain size of 90% of material is less than 43 micrometers; pneumatic separation to remove superlarge granules (greater than 74 micrometers) and superfine granules (less than 2 micrometers), blending and mixing so as to obtain the invented product with low-cost. stable quality and good filtering effect.

Description

technical field [0001] The invention relates to a preparation method of a tuff filter aid used to help the liquid to be filtered increase the filtration rate and improve the clarity, and is widely used in industrial sectors such as wine, food, chemical industry, oil refining, medicine, environmental protection, and sewage treatment. Background technique [0002] Many substances can be used as filter aids after processing, such as diatomaceous earth, perlite, cellulose, asbestos fiber, carbon powder, activated carbon, filter cotton, fine silica gel, fine sand and powdered ion exchange resin, etc. Among them, diatomite and perlite filter aids are the most widely used and used in the largest amount, and are common general-purpose filter aids; cellulose, asbestos, activated carbon, etc. also have their special properties, and are common auxiliary filter aids. [0003] In recent years, the consumption of diatomite filter aid has always accounted for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30
Inventor 汪灵木士春
Owner 中国科学院长沙大地构造研究所
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