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GB/T 31852-2015 English PDF

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GB/T 31852-2015: Treatment and disposal specification for chromite processing residue
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PDF similar to GB/T 31852-2015


Standard similar to GB/T 31852-2015

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Basic data

Standard ID GB/T 31852-2015 (GB/T31852-2015)
Description (Translated English) Treatment and disposal specification for chromite processing residue
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Z05
Classification of International Standard 13.030.10
Word Count Estimation 11,112
Date of Issue 2015-07-03
Date of Implementation 2016-02-01
Quoted Standard GB 5085.3-2007; HJ/T 299
Regulation (derived from) National Standard Announcement 2015 No.22
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard specifies the terms and definitions of chromium slag disposal method, chromium slag disposal method, after the chromium slag treatment and wastewater treatment requirements. This Standard applies to chromium slag disposal process.

GB/T 31852-2015: Treatment and disposal specification for chromite processing residue

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Treatment and disposal specification for chromite processing residue ICS 13.030.10 Z05 National Standards of People's Republic of China Chromium slag disposal norms Issued on. 2015-07-03 2016-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the national waste chemicals disposal Standardization Technical Committee (SAC/TC294) centralized. This standard was drafted. Sichuan Galaxy Chemical Co., Ltd., CNOOC Tianjin Chemical Research & Design Institute, Hubei Zhenhua Chemical Co. Ltd., Gansu Jin Shi Chemical Co., Ltd., Shandong CIQ. The main drafters of this standard. Mashun You, Li Xia, Chen Xiaohong, Zhang Yuan, Zhaozu Liang, Xie You-cai, Mao Xueqin, Liu Jingwen, Brighton too. Chromium slag disposal norms

1 Scope

This standard specifies the terms and definitions of chromium slag disposal method, chromium slag disposal method, after the chromium residue and waste water treatment requirements deal with. This standard applies to chromium slag disposal process.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB 5085.3-2007 standard differential hazardous waste leaching toxic identification HJ/T 299 methods for leaching toxicity of solid waste sulfuric acid nitric acid method

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Chromium chromiteprocessingresidue Chromite chromium compounds as raw materials in the process, after roasting, leaching residue produced after the chromium slag. Among them, chromite mining Sludge with calcium roasting process (no added calcium roasting any substance) produced called calcium-free chromium slag.

4 chromium slag disposal method

4.1 calcium chromium slag produced chromium alloy 4.1.1 The principle of the method Calcium chromium slag, reducing agents (coke, semi-coke or coal), flux (silica, lime or fluorite) and other high-temperature smelting in an electric furnace. High temperature C is the slag oxide partial oxidation of CO, CO and C will restore the slag hexavalent chromium to trivalent chromium, and then the residue Cr2O3, Fe2O3 also Original elemental Cr, Fe, Cr carbide is part of the iron carbide. Elemental Cr, Fe and carbides mutual melting molten metals (chromium phase), no Low calcium chromium slag other constituents SiO2, MgO, Al2O3, or the like at a lower melting point eutectic mixture of flux action (slag phase). Ferrochrome Molten slag phase and phase each other, and the relative density is greater than ferrochromium slag phase density, resulting in a two-phase stratified. Flux in the slag other components to generate a eutectic mixture Compound while reducing the melting point and viscosity of the slag phase, easy and ferrochromium slag phase separation layered sequentially released. The main chemical reaction formula as follows. 2C O2 → 2CO ↑ 2Na2CrO4 3CO → 2NaCrO2 Na2CO3 2CO2 ↑ 4Na2CrO4 3C → 4NaCrO2 2Na2CO3 2CO2 ↑ Fe2O3 3C → 2Fe 3CO ↑ 2/3Cr2O3 2C → 4/3Cr 2CO ↑

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