GB/T Translated English of Chinese Standard: GB/T NATIONAL STANDARD OF THE

Transcription

1 Translated English of Chinese Standard: GB/T GB NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA ICS Q 69 GB/T Replacing GB Diatomite filter aid for industrial 工业用硅藻土助滤剂 Issued on: June 24, 2014 Implemented on: February 1, 2015 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Page 1 of 13

2 Table of Contents Foreword Scope Normative references Terms and definitions Classification and marking Requirements Test methods Inspection rules Marks Package, transport and storage Appendix A Page 2 of 13

3 Foreword This Standard was drafted in accordance with the rules given in GB/T This Standard replaces GB Diatomite filter aids. Compared with GB , the main technical changes are as follows: - Modified the property of standard from mandatory to recommendatory, the name from Diatomite filter aids to Diatomite filter aid for industrial ; - Modified baked diatomite to calcined diatomite ; representation symbol was modified from BS to DS as well (refer to 3.2, 3.3 of this Edition; 3.2 and 3.3 of 2009 Edition); - Models were merged and modified from 15 to 3 (refer to of this Edition; of 2009 Edition); - Modified marking mode (refer to 4.2 of this Edition; 4.2 of 2009 Edition); - Deleted quality requirements for diatomite filter for food and medicine as well as corresponding test methods (refer to 5.1 of 2009 Edition); - Deleted provisions on appearance color; made appropriate modification on requirements for microstructure (refer to Table 2 and Table 3 of 2009 Edition); - Modified requirements for moisture indicator from 0.5% to 3.0% (refer to Table 2 and Table 3 of 2009 Edition); - Modified requirements for water soluble indicator from 0.5% to 0.8% (refer to Table 2 and Table 3 of 2009 Edition); - Modified requirements for silicon oxide from 85% 82% 80% to 85% 80% 75% respectively (refer to Table 2 and Table 3 of 2009 Edition); - Deleted indicator requirements for ferric oxide, aluminum oxide, calcium oxide, and magnesium oxide; it was modified as Other chemical components shall be determined by the seller and the buyer after negotiation (refer to Table 2 and Table 3 of 2009 Edition); - Made appropriate modification on inspection method for microstructure (refer to 6.1 of this Edition; 6.1 of 2009 Edition); - Refined requirements for permeability measuring device (refer to of this Edition; of 2009 Edition); Page 3 of 13

4 Diatomite filter aid for industrial 1 Scope This Standard specifies terms and definitions, classification and marking, requirements, test methods, inspection rules, marks, package, transport and storage of diatomite filter aid for industrial. This Standard is applicable to diatomite filter aid for industrial of which the main raw material is diatomite and is made by calcination or flux calcination. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. JC/T 414 Diatomite 3 Terms and definitions The following terms and definitions apply to this Standard. 3.1 Permeability The volume of filtrate per filter cake thickness of per filter area at per unit time when filtrate viscosity is 1 cp and filtration layer pressure is Pa. 3.2 Calcined diatomite The product that is made of diatomite by calcination at 650 C ~ 1000 C, grinding and classification. 3.3 Flux calcined diatomite The product that is made of diatomite by adding appropriate amount of flux after calcination at 650 C ~ 1000 C, grinding and classification. Page 5 of 13

5 Moisture / % 3.0 Water soluble / % 0.8 ph value (10% water slurry value) 5.5~11.0 Tap density /(g/cm 3 ) 0.53 SiO2 / % Other chemical Determined by the seller and the buyer after negotiation 6 Test methods 6.1 Inspection of microstructure Apparatus Microscope: 20 (Objective lens) 10 (Eye lens) Test procedures Drop a drop of distilled water on a microscope slide. Add microscale of sample. Cover the cover slide. Place it under microscope to observe. Conduct image processing when necessary. 6.2 Determination of permeability Apparatus Requirements are as follows: a) Pressure measuring equipment: U type pressure gauge (measuring range is 1000 Pa) or vacuum gauge (measuring range is 0~0.01 MPa). b) Vacuum pump: measuring range is (0~0.01) MPa. c) Regulator bottle: volume is about 10 L. d) Test bottle: the fine neck diameter of #1 and #2 test bottles shall be 20 mm; fine neck height of #1 test bottle shall not be less than 50 mm. There shall be graduation from the bottom and division value shall not be greater than 1 mm. Fine neck outlet under the flange shall be (30~50) mm lower than horizontal branch pipe, so as to prevent filtrate from being pumped into regulator bottle. e) Balance: inductance is 0.1 g. f) Stopwatch: accuracy is 0.1 s. Page 7 of 13

6 distilled water along the sidewall of #1 test bottle (do not directly pour the distilled water on filter cake). Filter it under a vacuum of 7600Pa ± 100Pa and the filtrate volume shall be approximately 40 ml. Accurately record the corresponding filter time t and filtrate volume V Repeat and take the average of 3 times to calculate filtrate flow Q (Q = V/t) Accurately determine the thickness of filter cake Determine the temperature of distilled water during the test, and read corresponding viscosity value by referring to Appendix A Results calculation Calculate permeability according to equation (1): Where, k - Permeability, in darcy; A - Filter area, in square centimeter (cm 2 ); Q - Filtrate flow (average of three test results), Q=V/t, in milliliter per second (ml/s); t - Filtration time, in second (s); V - Filtrate volume in filtration time t, in milliliter (ml); η - Coefficient of viscosity, in centipoise (cp); h - Filter cake thickness, in centimeter (cm); P - Degree of vacuum, in pascal (Pa). 6.3 Determination of moisture Conduct according to JC/T Determination of water soluble Weigh about 5 g (make it accurate to 0.01 g) of sample and place it into a dried 150 ml conical flask. Accurately add ml distilled or deionized water (ph value is 5.5 ~ 7.2). Mix well. Heat and boil it for 30 min. Stir it Page 9 of 13

7 7 Inspection rules 7.1 Inspection classification Factory inspection Factory inspection items are permeability, moisture and tap density Type inspection Type inspection items include all requirements in Clause 5. Type inspection shall be conducted for one of the following situations: a) When new products are put into production or identification of stereotype; b) When great changes in raw material or technique that that may affect product quality; c) When factory inspection results are quite different from the ones of last type inspection; d) When production is resumed after it is stopped for more than 3 months; e) Conduct once every 6 months during normal production. 7.2 Batching principle Every 500 t of diatomite filter aid for industrial of same category, same grade and in continuous production shall be one batch. If it were less than 500 t, it shall be regarded as one batch. 7.3 Sampling method Regard bag as sampling unit. Use equidistant sampling: take one bag from every n-1 bag (n=n/20; N is the total number of bags of this batch of products, n takes integer). Use closable sampling probe to take about 100 g of sample in this bag. Mix it to mixed sample. When batch quantity is less than 200 bags, appropriately increase sample amount of each bag, so as to make the total sample amount not less than 1 kg. 7.4 Sample storage After completely mixing, the collected sample shall be divided into two portions by coning and quartering. Respectively place them into clean and dry wildmouth jars. Cover the caps and label them (date of sampling, sampling person, manufacturer s name, factory lot and batch number and batch shall be indicated Page 11 of 13

8 Appendix A (Informative) The relationship between water temperature and viscosity coefficient The relationship between water temperature and viscosity coefficient is shown in Table A.1. Temperature / C Table A.1 Unit: cp END Page 13 of 13