company name: gansu lixinyuan microsilica co. ltd
contact person: manager sun
telephone: 0931-8516622
phone: 18919161001
email address: microsilica@gslxy.cn
fax: 0931-8507755
website: www.gslxy.cn
address: no. 2599, yanbei road, chengguan district, lanzhou city, gansu province
industrial standard for microsilica gbt21236-2007
range of 1.
this standard specifies the product's brand, technical requirements, test methods, inspection specifications, packaging, marking, storage, transportation and quality certificate.
this standard is applicable to the microsilica collected through the smoke hood of the electric furnace and other production of silicon and industrial silicon. the product is called "microsilica recovered by electric furnace" (referred to as "silicon ash").
2. normative reference documents
the terms in the following documents become the terms of this standard by reference. all subsequent amendments (not including errata) or amendments to a referenced document with a date indicated do not apply to this standard, however, parties agreed upon in accordance with this standard are encouraged to study whether the latest version of these documents is available. for undated reference documents, the latest version applies to this standard.
test method for water content of refractories in gb/t 3007
method for chemical analysis of siliceous refractory
gb/t 6901.2 determination of silica content by gravimetric molybdenum blue light method
gb/t 6901.3 determination of silica content by hydrofluoric acid gravimetric method
gb/t 6091.5 determination of alumina by chromium-rhodium s spectrophotometric method
gb/t 6901.6 determination of alumina by edta capacity method
methods for chemical analysis of siliceous refractory calcium oxide and magnesium oxide by flame atomic absorption spectrometry
general principle for ph value determination of gb/t 9274 chemical reagent
gb/t 14506.5-1993 determination of ferric oxide by chemical analysis of silicate rocks
gb/t 14506.11-1993 determination of potassium oxide and sodium oxide by chemical analysis of silicate rocks
gb/t 16555.1-1996 chemical analysis of silicon carbide refractories by absorption gravimetry
gb/t 16555.2-1996 chemical analysis of silicon carbide refractories - determination of silicon carbide content by volumetric method
gb/t 18736-2002 mineral admixture for high strength and high performance concrete
the specific surface area of solid substance was determined by the bet method of gas adsorption gb/t 19587
yb/t 5142 packing, marking, transportation, storage and quality certificate of metallurgical mineral products
test method for yb/t 5164 refractory mud screen analysis
chemical analysis of chlorine in jc/t 420 cement
3. brand
the microsilica is divided into five grades: sf96,sf93,sf90,sf88 and sf85.
sf is an acronym for silica fume. the number is the silica mass fraction.
4. technical requirements
the technical requirements of various brands are shown in table 1. if there are special requirements, they shall be determined through negotiation between the supply and demand parties.
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5. test method
5.1 the determination of silica is conducted in accordance with gb/t 6901.2 or gb/t 6901.3.
5.2 determination of alumina shall be conducted in accordance with the provisions of gb/t 6901.5 or gb/t 6901.6.
5.3 the determination of ferric oxide shall be conducted in accordance with the provisions of chapter iii "determination of ferric oxide content by o-diazylafil photometry" of gb/t 14506.11-1993.
5.4 the determination of calcium oxide and magnesium oxide was carried out according to gb/t 6901.8.
5.5 the determination of potassium oxide and sodium oxide was conducted in accordance with the provisions in the second chapter "determination of potassium oxide and sodium oxide by flame atomic absorption spectrophotometry" of gb/t 14506.11-1993.
5.6 the determination of carbon content shall be conducted in accordance with the provisions of 7.4.2 in gb/t 16555.1-1996 or 7.3.2 in gb/t 16555.2-1996.
5.7 determination of chloride ions was conducted in accordance with jc/t 420.
measurement of 5.8 ph value: the silica powder was weighed at 5.00g and placed in a 150ml beaker. 50ml distilled water that had been boiled and cooled to room temperature was added and continuously stirred for 5min to form a uniform slurry.
5.9 determination of burning reduction was conducted in accordance with gb/t 6901.1.
5.10 moisture determination shall be conducted in accordance with gb/t 3007.
5.11 determination of specific surface area shall be conducted in accordance with gb/t 19587.
5.12 45? the determination of m sieve residue was conducted according to yb/t 5164.
5.13 water requirement ratio and volcanic ash activity index are determined according to the method specified in appendix c of gb/t 18736-2002.
6. inspection rules
6.1 group batch and sampling
6.1.1 the batch of batch is 20t for continuous production of silicon powder, and the batch is deemed as less than 20t.
6.1.2 sampling: 10 bags of microsilicon powder were randomly selected from the bag. then, one sample was taken from each bag, and each sample weighed 200g-500g to form a large sample. after the mixture was evenly mixed, the sample was shrunk into the required amount according to the four-point method.
6.1.3 the inspection items of this standard are: sio2, burning reduction, moisture, 45? m sieve residue, ph value; if the production process or raw materials are changed, the inspection results of all inspection items in table 1 should be provided. if there are special requirements, the two parties negotiate to determine.
6.2 decision rule
the technical indexes of the sample drawn shall conform to the provisions in table 1. if the sample has been consistently unqualified, double quantity of sample shall be extracted from the same batch of materials for the reinspection of the project. if the sample is still unqualified, it shall be judged as unqualified.
7. export packing, marking, transportation, storage and quality certificate of silicon powder
packing, marking, transportation, storage and quality certificate of the product shall be carried out in accordance with yb/t 5142.
worldwide standards for the chemical composition of microsilica
物理和化学性能 | 美 国 | 欧洲 | 加拿大 | 日本 | 中国 | 巴西 | 韩国 | 意大利 |
sio2(%) | >85.0 | >85.0 | >85.0 | >85.0 | >85.0 | >85.0 | >85.0 | >85.0 |
so3(%) | <2.0 | <1.0 | <3.0 | <3.0 | ||||
cl(%) | <0.3 | <0.1 | <0.2 | <0.3 | ||||
free cao(%) | <1.0 | <1.0 | ||||||
mgo(%) | <5.0 | <5.0 | ||||||
free si(%) | <0.4 | |||||||
碱含量(%) | <1.5 | <1.5 | ||||||
湿度(%) | <3.0 | <3.0 | <3.0 | <3.0 | <3.0 | |||
烧失量(%) | <6.0 | <4.0 | <6.0 | <5.0 | <6.0 | <6.0 | <5.0 | <4.0 |
比表面积(m2/g) | >15 | 15-35 | >15 | >15 | >15 | >15 | ||
活性指标(%) | >105@7d | >95@7d | >85@28d | >95@7 | >85@7d | |||
粒度(45um筛余%) | <10 | <10 | <10 | <5.0 | <10 | |||
平均粒度(%) | <5 | <5 | ||||||
需水比（%） | <125 |
consulting
