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Process for treating a gas contaminated by metals or organics compounds using a calcium-phosphate reactant comprising apatite

A calcium phosphate and reactant technology, applied in the field of gas contaminated by heavy metals or organic compounds, can solve the problems of expensive use and cost, and achieve the effect of improving fluidity and dispersion

Inactive Publication Date: 2018-03-27
SOLVAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads especially to the use of expensive ATEX equipment suitable for explosive atmospheres
Furthermore, the burning of activated carbon on the surface of the filter cloth is a problem when using bag filter technology, especially when fusible materials are included (such as PTFE, polyamide, etc...), since such bag replacements are expensive

Method used

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  • Process for treating a gas contaminated by metals or organics compounds using a calcium-phosphate reactant comprising apatite
  • Process for treating a gas contaminated by metals or organics compounds using a calcium-phosphate reactant comprising apatite
  • Process for treating a gas contaminated by metals or organics compounds using a calcium-phosphate reactant comprising apatite

Examples

Experimental program
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Effect test

example 1

[0213] In this example, a calcium phosphate comprising 5% water and the remainder mainly comprising hydroxyapatite Ca5(PO4)3(OH), will be produced according to Example 8 of the WO2015 / 173437 patent application (according to the conditions of Example 1.b) The (Ca / P) reactants were tested in the laboratory and then in a small pilot plant using a portion of the industrial gas stream from the crematorium.

[0214] 1.a Preliminary laboratory tests

[0215] condition:

[0216] - Generates polluted gases from air

[0217] - Contaminants tested: Cd, Pb, Zn (introduced as chloride salts)

[0218] - in an oven at a temperature of 600°C to 700°C

[0219] - Use air flow at 150NL / h

[0220] All 3 contaminants (Cd2+, Pb2+ and Zn2+) were unambiguously captured in one pass and showed excellent adsorption capacity when the gas stream was contacted with this calcium phosphate reactant (see Table 1).

[0221]

[0222] Table 1 Adsorption capacities of apatite-based calcium phosphate reactan...

example 2

[0255] Example 2 - Industrial Testing

[0256] For industrial testing at the Uitzicht crematorium, according to figure 1 An industrial testing protocol using concomitant injection of sodium bicarbonate and apatite

[0257] The flue gas temperature when injecting apatite and sodium bicarbonate was 180°C.

[0258] Mercury and other metals are analyzed before the cyclone and in the chimney.

[0259] For industrial testing, regarding the location and arrangement of airflow sampling and metal analysis:

[0260] - Same as the first test, using glass fiber filter

[0261] -and then the chimney, with a glass fiber filter before bubbling the sampled airflow.

[0262] The results of the industrial tests are given in Table 3 and in the comments below:

[0263] - Regarding metal analysis in airflow:

[0264] no Hg in the Hg trap from the quench and chimney (dichromate solution = Hg trap),

[0265] Very low concentrations in the filtered gas solution,

[0266] levels in the flue ga...

example 3

[0271] Example 3 - Industrial Testing

[0272] Industrial tests are carried out in a domestic waste incinerator with a capacity of 11t / h. The airflow to be treated is 63000Nm3 / h. The treatment line is equipped with dry mitigation injection of alkaline compounds, capable of injecting sodium bicarbonate or slaked lime for acid gas mitigation (HCl, HF, SO2, SO3), as well as for heavy metals, dioxins and furans and aromatic organics Activated carbon sorbent injection (including benzo(a)pyrene). The average HCl concentration in the gas stream was about 1100 mg / Nm3 (at 11% O2) and the average SOx concentration was about 205 mg / Nm3. The temperature of the gas at the injection point was about 230°C. The average sodium bicarbonate injection flow reported per ton of waste was about 14.8 kg / t waste and the activated carbon injection flow was about 0.4 kg / t waste. The contact time of the basic compound and adsorbent (related to the length of the flue gas duct up to the downstream filt...

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Abstract

Process for treating a gas contaminated by at least one element selected from the group consisting of heavy metals, organic compounds, and combinations thereof, wherein a calcium-phosphate reactant (reagent) particle comprising apatite is brought into contact with the contaminated gas at a temperature of at least 30 DEG C and preferably at most 1100 DEG C. The metal(s) and / or organic compound(s) to be removed from the contaminated gas may be selected among the list of : Al, Ag, As, Ba, Be, Bi, Ce, Co, Cd, Cu, Cr, Fe, Hf, Hg, La, Li, Mg, Mn, Mo, Ni, Pb, Pd, Rb, Sb, Se, Sn, Sr, Th, Ti, U, V, Y,Zn, Zr, VOC, aromatic compounds, PAHs, dioxins, furans, or any mixture thereof. In such process, an alkaline compound particle comprising sodium bicarbonate, sodium carbonate, sodium sesquicarbonate (trona), quick lime, hydrated lime, lime stone or combinations thereof, may be further brought into contact with the contaminated gas.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to US Provisional Application No. 62 / 170680, filed June 3, 2015, the entire contents of which are incorporated herein by reference for all purposes. technical field [0003] The present invention relates to a method for treating gases contaminated with heavy metals or organic compounds using a calcium phosphate reactant comprising apatite. Background technique [0004] The problems caused by the effects of volatile metals, and especially heavy metals, in the environment are well known. Many industrial processes release liquid or gaseous effluents that are highly loaded with heavy metals, especially heavy metal soluble salts, such as salts in cationic or anionic form. According to the generally accepted definition (Heavy Metals in Wastewater and Sludge Treatment Processes, Vol. I, CRC Press, 1987, p. 2), the expression "heavy metals" should be understood as means its density is at least...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/34B01D53/44B01D53/64B01D53/80B01D53/83B01J20/04
CPCB01D53/346B01D53/44B01D53/64B01D53/80B01D53/83B01D2251/304B01D2251/404B01D2251/606B01D2251/61B01D2253/112B01D2253/306B01D2257/206B01D2257/60B01D2257/602B01D2257/7027B01D2257/708B01D2258/0283B01D2259/128B01J20/041B01J20/043B01J20/048B01D39/06B01D53/46B01D53/72B01D53/75B01D2239/0208B01D2251/512B01D2251/60B01D2253/102B01D2257/2045B01D2257/2047B01D2257/302B01D2258/0291
Inventor T.德普兰切O.博德森D.布鲁格尔曼斯P.佩兰J-P.巴兰德
Owner SOLVAY SA
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