GB/T 6645-2008Granulated electric furnace phosphorous slag used for cement (English PDF)

Foreword

This Standard replaces GB/T 6645-1986 Granulated Electric Furnace Phosphorous Slag Used for Cement Production.

In comparison with GB/T 6645-1986, this Standard has the following main changes.

---NOTE is added to the definition of granulated electric furnace phosphorous slag (Chapter 2 in Version 1986; Chapter 3 in this version);

---Radioactive indexes and corresponding inspection methods of phosphorous slag are added (4.6 in this version; 5.7 in this version);

---Inspection rules specifically stipulate the determination rules of exit-factory inspection and type inspection of phosphorous slag (Chapter 4 in Version 1986; 6.5 in this version);

---Appendix A in the previous standard is modified into determination method of bulk weight of granulated electric furnace phosphorous slag; Appendix B in the previous standard is deleted.

Appendix A in this Standard is normative.

1 Scope

This Standard specifies the terms, definitions, technical requirements, test methods and inspection rules of granulated electric furnace phosphorous slag used for cement.

This Standard is applicable to granulated electric furnace phosphorous slag used for cement mixture.

2 Normative References

Through the quotation in this Standard, clauses in the following documents become clauses in this Standard. In terms of references with a specific date, all the subsequent modification sheets (excluding corrected content) or revised versions are not applicable to this Standard. However, all parties that reach an agreement in accordance with this Standard are encouraged to explore the possibility of adopting the latest versions of these documents. In terms of references without a specific date, the latest versions are applicable to this Standard.

GB 175 Common Portland Cement

GB/T 6003.2 Test Sieves of Perforated Metal Plate

3 Terms and Definitions

The following terms and definitions are applicable to this Standard.

Granulated Electric Furnace Phosphorous Slag When electric furnace method is adopted to prepare yellow phosphorus, molten material, whose primary element is calcium silicate, is obtained. Through quenching granulation, it becomes granulated electric furnace phosphorous slag (phosphorous slag, for short).

4 Technical Requirements

4.1 Mass coefficient K of raw phosphorous slag shall be not less than 1.1.

4.2 In phosphorous slag, mass fraction of phosphorous pentoxide shall be not more than 3.5%.

4.5 Any foreign substances, for example, phosphorus mud, shall not be mixed into it.

4.6 Conduct the inspection in accordance with 5.6, the radioactivity of phosphorous slag shall satisfy relevant requirements in GB 6566.

5 Test Methods

5.1 Calcium Oxide, Magnesium Oxide, Silicon Dioxide, Aluminum oxide, Fluorine Content and Phosphorus Pentoxide Content

Conduct the test in accordance with the method in JC/T 1088.

6 Inspection Rules

7 Transportation and Storage

In bulk transportation, phosphorus slag shall not be mixed with other materials. Wagon or compartment must be cleaned up, so as to avoid the mixture with foreign substances.

In terms of storage, foreign substances shall not be mixed with phosphorus slag.

8 Requirements of Usage

When a cement enterprise starts using phosphorous slag provided by the supply side, it shall conduct acceptance inspection in accordance with all the requirements in Chapter 4.

Appendix A (Normative) Determination Method of Bulk Weight of Granulated Electric Furnace Phosphorous Slag