Chromium reducing agent and cement-based mixture using same
A dispersant, methylamino technology, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problem of weakened chromium reduction effect, achieve effective chromium reduction effect, good efficiency, improve chromium reduction agent effect of smell
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Embodiment 1
[0055] A chromium reducing agent, which includes the following raw materials in parts by mass:
[0056] Chromium-reducing composition, including 17 parts of 3-methylamino-1,2-propanediol, 5 parts of 10-undecenal, 3 parts of zinc sulfoxylate and formaldehyde, and 7 parts of sodium nitrite;
[0057] The dispersant is 8 parts of modified shell powder. The modified shell powder is obtained by soaking shell powder in 1mol / L sodium hydroxide solution for 4 hours, draining, washing with water, and drying at room temperature. The particle size of the modified shell powder is 400 ± 20nm;
[0058] Thinner, the thinner is water, and its consumption is 5 times of the composition quality of chromium reduction.
[0059] The preparation method of above-mentioned chromium reducing agent is as follows:
[0060] S1: Mix 8 kg of dispersant with 5 kg of 10-undecenal, and let stand for 4 hours after mixing to obtain a mixture. Add the mixture to the preparation water of mixed liquid A whose mass...
Embodiment 6～7
[0091] A chromium reducing agent, which is based on the preparation method of Example 4, the difference is that the amount of raw materials is different. The specific raw material consumption of Examples 6-7 is shown in Table 3 below.
[0092] Table 3. Experimental test results of the air oxidation effect of the chromium reducing agent of Examples 1 to 5 and Comparative Example 1
[0093] Chromium reducer raw material Comparative example 2 Comparative example 3 Example 6 Example 7 Dispersant / kg 6.5 6.5 6.5 0 10-undecenal / kg 5 5 5 0 Zinc sulfoxylate combined with formaldehyde / kg 3 3 0 3 Sodium nitrite / kg 0 30 6 6 3-methylamino-1,2-propanediol / kg 30 0 24 24 Mixture A preparation water / kg 57.5 57.5 57.5 0 Mixture B preparation water / kg 132.5 132.5 117.5 165 Total water / kg 190 190 175 165 The proportion of chromium-reducing composition in chromium-reducing agent 16.2 16.2 16.2 16.7 ...
Embodiment 8
[0095] A chromium-reducing agent, which differs from Example 4 in that an equal mass of 3-diethylamino-1,2-propanediol is used instead of 3-methylamino-1,2-propanediol.
[0096] The chromium-reducing agents of Comparative Examples 2-3 and Examples 6-8 were subjected to the experimental test of the influence of air oxidation, and the test results are shown in Table 4 below.
[0097] Table 4. Experimental test results on the influence of air oxidation of the chromium reducing agent of Comparative Examples 2 to 3 and Examples 6 to 8
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[0099]
[0100] *The sample of Comparative Example 3 separated and formed an obvious oil film above the liquid surface between 19 and 20 hours, so no follow-up test was carried out.
[0101] From Example 4, Comparative Example 2 and Comparative Example 3, in conjunction with Table 4, it can be known that the combined use of 3-methylamino-1,2-propanediol and nitrous acid in the chromium-reducing component of the present application can...
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