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Process to reduce the amount of cr (vi) in a cement-containing composition and a composition comprising cement and coated metallic sulphate particles

一种金属硫酸盐、水泥组合物的技术，应用在金属硫酸盐领域，能够解决硫酸亚铁不稳定等问题，达到经济有利、成本低、高溶解性的效果

Inactive Publication Date: 2010-01-13
LAFARGE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the problem encountered with this technique is the instability of ferrous sulfate under the storage conditions of cement

Method used

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  • Process to reduce the amount of cr (vi) in a cement-containing composition and a composition comprising cement and coated metallic sulphate particles
  • Process to reduce the amount of cr (vi) in a cement-containing composition and a composition comprising cement and coated metallic sulphate particles
  • Process to reduce the amount of cr (vi) in a cement-containing composition and a composition comprising cement and coated metallic sulphate particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Example 1. Reduction of the amount of soluble chromium(VI) in cement using 2% gelatin coated particles

[0092] 2% gelatin coated ferrous sulphate particles were obtained using the method described above with the following measured particle sizes.

[0093] The coated particles had the following measured particle sizes:

[0094] Particle size:

Mass% undersize

500 microns

98

200 microns

90

[0095] 100 microns

73

[0096] The reduction of chromium (VI) in each cement was measured by mixing the various cements with virgin ferrous sulfate powder, or with the coated particles. The particular cement used in the examples was identified by reference to the well known standards BS EN 197-1:2000 and BS 4027:1996. Thus, "CEM I" refers to Standard Portland Cement, and code 52.5N refers to the strength classification.

[0097] Experimental results

[0098] The expression "control" as used hereinafter refers...

Embodiment 2

[0109] Example 2. Reduction of Soluble Chromium(VI) Amount in Cement Using 1% Gelatin Coated Particles

[0110] 1% gelatin-coated ferrous sulfate particles were obtained using the method described above.

[0111] In this example, the amount of ferrous sulfate introduced into the cement in order to reduce soluble chromium (VI) was varied.

[0112] Different amounts of coated particles of the invention were added to cement and the retention of potency in the portion of the coated particles in terms of reduction of soluble chromium (VI) was measured after accelerated aging.

[0113] Experimental results

[0114] Table 4

[0115] CEM I 52.5N cement containing 13.3 ppm soluble chromium (VI) treated with coated particles with 1% gelatin was used.

[0116]

[0117] Observed at 40ppm Fe 2+ Particles coated with 1% gelatin added at a ratio of Cr(VI) / ppm remained effective in terms of reduction of soluble chromium(VI) after the aging test, while uncoated ferrous sulfate powde...

Embodiment 3

[0118] Example 3. Use of different types of coatings around ferrous sulfate on standardized sand Influence of the amount of soluble Cr(VI) in slurry

[0119] Cement 1 was CEM I 52.5N with 12 ppm soluble Cr(VI).

[0120] Prepare standardized mortars according to standard NF EN 196-1.

[0121] The measurement of entrained air is carried out according to standard NF EN 413-2.

[0122] A coating protocol using a different gelatin (oleate, oleic acid, styrene-acrylic, and alginate) involves the following steps:

[0123] - dehydration of ferrous sulfate as described in step 1 above;

[0124] - preparation of the coating solution by dissolving 1% by weight or 2% by weight of the coating material of dehydrated ferrous sulphate in an amount of water sufficient to rehydrate the dehydrated ferrous sulphate and obtain ferrous sulphate heptahydrate;

[0125] - rapid introduction of about 200 g of dehydrated ferrous sulfate in the coating solution at 90°C;

[0126] - mixing in a Ray...

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Abstract

A method for producing a cement-containing material, in particular a cement-containing material having a low content of soluble Cr (Vl) which comprises the step of providing a cement-containing material with metallic sulphate particles coated with at least one product of the hydrolysis of a collagen material such as gelatine. It is also provided a method for reducing the content of Cr (Vl) in a cement-containing material and a cement-containing composition which comprises a cement and a metallic sulphate particles coated with at least one product of the hydrolysis of a collagen material. It is further provided the use of metallic sulphate particles coated with a collagen derived material as an additive in a cement-containing composition.

Description

technical field [0001] The present invention relates to coated particles of at least one metal sulphate, in particular ferrous sulphate, which are suitable for the production of cement, especially cement with a low soluble chromium (VI) content. According to a particular feature of the invention, these particles are coated with a collagen derivative such as gelatin or glue. Background technique [0002] In the most general sense, cement is a binder, a substance that sets and hardens independently and is capable of binding other materials together. Cement used in construction can be characterized as hydraulic or non-hydraulic. The most important use of cement is in the preparation of mortar and concrete - combining natural or man-made aggregates to form a strong building material that is durable in the face of usual environmental action. Hydraulic cement is a material that sets and hardens when combined with water as a result of a chemical reaction with mixed water, and aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B22/14C04B28/02
CPCC04B28/02C04B22/142C04B2111/1081C04B20/1029C04B22/149
Inventor H·德贝格纳克
Owner LAFARGE SA
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