GB/T 6288-2021 in English

VALID

Determination of particle size for granular molecular sieve

Issued on:2021-08-20
Implemented on:2022-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	GB/T 6288-2021
Document status:	VALID
Title in English:	Determination of particle size for granular molecular sieve
Title in Chinese:	粒状分子筛粒度测定方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-08-20
Implemented on:	2022-03-01
Superseding:	GB/T 6288-1986 Determination of particle size for granular molecular sieve
ICS Classification:	71.100.99-Other products of the chemical industry
Chinese Classification:	G85-Other chemical products in general
Professional Classification:	GB-National Standard
Related Keywords:	molecular sieve determination innovation molecular sieve industry standard test sieve granular molecular sieve introduction core changes test sieve
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《GB/T 6288-2021粒状分子筛粒度测定方法》由TC105（全国肥料和土壤调理剂标准化技术委员会）归口，TC105SC6（全国肥料和土壤调理剂标准化技术委员会分子筛分会）执行，主管部门为中国石油和化学工业联合会。

Introduction

Core changes in the standard revision

Technical elements	1986 edition	2021 edition	Significance of improvement
Definition of terms	Not clearly defined	Five new terms	Uniform industry expressions
Instrument requirements	Brief description	Refine the parameters of vibrating screen and test sieve	Improve test consistency
Precision	Not specified	Spherical 15%, strip 2%	Quantitative quality control

Analysis of key technical points

1. Determination of spherical molecular sieves

Core formula: The average particle size is calculated by weighted average method, which is calculated by the mass fraction after classification of the standard test sieve and the corresponding sieve hole diameter, to ensure the accuracy of D_avg = ∑(G_i×(r_i+r_i+1))/2.

2. Strip molecular sieve determination

Innovation: It is required to use a vernier caliper to directly measure the strip diameter, and the average calculation of 25 samples requires a measurement accuracy of 0.02mm, which is one order of magnitude higher than the old standard.

Implementation suggestions

Laboratory configuration: It is recommended to equip a standard sieve shaker with horizontal/vertical dual-mode vibration, and regularly verify the aperture accuracy of the test sieve with standard samples.

Quality control: It is recommended to pre-screen spherical samples to avoid oversized particles affecting the sieve effect; when measuring strip samples, attention should be paid to the correction of the cross-section ellipticity.

Technology Evolution Analysis

This standard introduces the concept of mass percentage of particle size distribution for the first time, replacing the original simple expression of the proportion of the sieve oversize. The 20-level test sieve aperture sequence (5.6mm-0.4mm) provided in Appendix A has established a unified particle size analysis benchmark for the molecular sieve industry.

More samples: YD/T 3934-2021 JJG 21-2008 GB 50021-2001(2009)

Sample only — not a preview of GB/T 6288-2021

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