YB/T 4494-2015 English PDF (YBT4494-2015)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click YB/T 4494-2015
Historical versions: YB/T 4494-2015
Preview True-PDF (Reload/Scroll if blank)

YB/T 4494-2015: Technical specification of mechanical sample preparation for measuring coke reactivity index and coke strength after reaction
YB/T 4494-2015
FERROUS METALLURGY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.10
H 32
Technical specification of mechanical sample preparation for
measuring coke reactivity index and coke strength after
reaction
ISSUED ON: JULY 14, 2015
IMPLEMENTED ON: JANUARY 01, 2016
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 4 
4 Instruments and equipment ... 5 
5 Preparation of specimens ... 8 
6 Equipment installation and maintenance ... 9 
7 Safety and environmental protection requirements ... 10 
Technical specification of mechanical sample preparation for
measuring coke reactivity index and coke strength after
reaction
1 Scope
This standard specifies the mechanical preparation instruments and equipment of
specimen, specimen preparation methods, equipment installation and maintenance
requirements, for the measuring the coke reactivity index and coke strength after
reaction.
This standard applies to the preparation of specimens for measuring the coke reactivity
index and coke strength after reaction.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1997 Coke - Sampling and preparation of samples
GB/T 4000 Coke - Determination of reactivity and strength after reaction
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Crushing and screening machine for coke particles
A device, which uses the principle of impact crushing, where the hammer head of
the crusher rotates at a certain speed, so that the coke is continuously impacted,
rubbed, ground, broken by the hammer head in the crusher cavity, thereby producing
the spherical-similar coke particles, which meet requirements.
3.2
Chamfering machine of coke particles
A device, which uses the principle of rolling shear, to grind and cut the coke surface,
thereby obtaining the spherical coke particles of standard size.
4 Instruments and equipment
4.1 Crushing and screening machine for coke particles
4.1.1 Crushing and screening machine for coke particles is composed of a hammer head,
a motor, a reducer, a reciprocating sieve, etc. Figure 1 is a schematic diagram of a typical
crushing and screening machine for coke particles.
4.1.2 Hammer head components: a total of 4 pieces, which are made of 45 steel (surface
quenching: HRC50 ~ HRC55). The schematic diagram of the hammer head assembly
is as shown in Figure 2.
4.1.3 The material of the shaping sieve is 65Mn; the thickness is ≥ 10 mm. The aperture
is Φ26 mm ~ Φ29 mm. The schematic diagram of the unfolding of the shaping sieve is
as shown in Figure 3.
4.1.4 The mesh size of the reciprocating sieve: Φ20 mm ~ Φ23 mm.
4.1.5 Loading particle size: < 100 mm.
4.1.6 Discharge particle size: ≥ 23 mm.
4.1.7 Rated power: 5.5 kW.
4.2 Chamfering machine of coke particles
4.2.1 The chamfering machine of coke particle is composed of a trommel sieve, a motor,
a reducer, etc. Figure 4 is a schematic diagram of a typical chamfering machine of coke
particle.
4.2.2 The trommel sieve is made of 45 steel. The schematic diagram of the trommel
sieve is as shown in Figure 5.
4.2.3 Grinding wheel: The particle size is 24#; the size is as shown in Figure 6.
4.2.4 Loading mass: < 5000 g.
4.2.5 Loading particle size: ≥ 23 mm.
4.2.6 Discharge particle size: Φ23 mm ~ Φ25 mm, spherical.
5.2.3 The crushing and screening machine for coke particles crushes and sieves the coke;
takes out the coke, which is larger than 23 mm; loads it into the trommel sieve of the
chamfering machine of coke particle, for the purposes of chamfering.
5.2.4 Turn on the chamfering machine of coke particle. The spherical coke and coke
powder of Φ23 mm ~ Φ25 mm are automatically discharged from the trommel sieve.
Pick out the obvious oval coke, from the coke particles.
5.2.5 For spherical coke of Φ23 mm ~ Φ25 mm, use a divider to separate 500 g of coke,
which is sent to the laboratory; the rest can be kept as a reserved sample.
5.3 Granularity requirements
The particle size of coke samples shall meet the requirements of GB/T 4000. The test
sieve and spherical coke particle treatment, which are used in this standard, shall meet
the requirements of the specified standard for the specimen.
Note: Other mechanical specimen preparation methods are allowed; the particle size shall meet
the requirements of GB/T 4000. In case of disputes, the mechanical specimen preparation
method of this standard shall prevail.
5.4 Deviation of specimen particle size
The particle size deviation of the specimen is ≤ 0.5 mm.
6 Equipment installation and maintenance
6.1 Crushing and screening machine for coke particles
6.1.1 Install the machine on the level ground; find the level; fix the feet.
6.1.2 The bearing seat and reducer shall be filled with oil in time AND checked regularly.
6.1.3 Regularly check whether the bolts of the motor, reducer, bearing seat are loose; if
it is loose, tighten it.
6.1.4 Regularly check the oil cup. Fill in oil in time, when the oil level reaches the lower
limit.
6.1.5 Regularly check the sieve and hammer head. If the diameter of the hammer head
is less than Φ113 mm, replace the hammer head in time. Any hole, which has a diameter
exceeding 29.5 mm, is deemed as a waste hole. When the waste hole rate of the sieve
exceeds 10% OR the thickness of the bottom of the sieve is less than 5 mm, it is
necessary to replace the sieve in time.
6.1.6 The equipment shall be equipped with dust removal facilities.