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Method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid

A technology of hydroxylamine nitrate and hydrazine nitrate, applied in chemical instruments and methods, water/sludge/sewage treatment, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of violent reaction, safety risk, leakage, etc. , to achieve the effect of mild reaction conditions, no safety hazards, and excellent economy.

Active Publication Date: 2021-04-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for removing hydrazine nitrate and hydroxylammonium nitrate mainly include adding oxidants such as sodium nitrite or introducing dinitrogen tetroxide gas, etc., which can oxidize hydrazine nitrate and hydroxylamine nitrate into nitrogen, water, nitrogen oxides and other products. , the shortcomings are: large consumption of oxidant, high cost; violent reaction, there are certain safety risks in engineering application; when sodium nitrite is used as oxidant, new solid waste sodium nitrate that is not easy to handle is produced; the primary utilization rate of nitrogen dioxide is low and there is a risk of leakage

Method used

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  • Method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid
  • Method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid
  • Method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Get 95g through pre-abrasion treatment and dry granular coconut shell activated carbon carrier (4-8 mesh), add 82g mass fraction and be 18% new ammonium chloride solution, soak overnight, filter, the activated carbon particles after filtering are put into vacuum oven Dry at 80°C for 4 hours to obtain 104.6 g of activated carbon carrier pre-impregnated with ammonium chloride salt. Put the pre-soaked ammonium chloride activated carbon carrier dry particles into the pot of the medical sugar coating machine, and spray 40g of ruthenium trichloride solution in the rotating state, which contains 3.0g of metallic ruthenium; Silica gel solution, the mass fraction of silicon dioxide in the silica gel solution is 24%. The material was dried in a drying oven at 120°C for 12 hours, then transferred to a tube furnace, heated to 400°C for 80 minutes under nitrogen protection, and roasted at a constant temperature for 5 hours, with a nitrogen flow rate of 40L / h; changed to hydrogen and...

Embodiment 2

[0034] Get 95g through pre-abrasion treatment and dried granular coconut shell activated carbon carrier (4-8 order), add 90g mass fraction and be 12% new ammonium chloride solution, soak overnight, filter, and the activated carbon particles after filtering are put into vacuum oven Dry at 80°C for 4 hours to obtain 101.8 g of activated carbon carrier pre-impregnated with ammonium chloride salt. Put the pre-soaked ammonium chloride activated carbon carrier dry particles into the pot of the medical sugar coating machine, and spray 40g of ruthenium trichloride and chloroplatinic acid mixed solution under the rotating state. The solution contains 3.0g of metal ruthenium and 1.0g of metal platinum; continue to rotate Spray 9.5g of alkaline silica gel solution with pH 10.0, and the mass fraction of silicon dioxide in the silica gel solution is 18%. The material was dried in a drying oven at 120°C for 12 hours, then transferred to a tube furnace, heated to 400°C for 80 minutes under n...

Embodiment 3

[0037] The catalyst preparation operation is the same as in Example 1, except that the particle size of the carrier is 20 to 40 mesh, the pH of the silica gel solution is 9.0, and 4.5 g of ruthenium is contained in 40 g of ruthenium trichloride solution to obtain 196.2 g of 3# catalyst, and the catalyst moisture content is 48.5 %, the moisture content of the catalyst is 48.7%.

[0038] Take 100mL of prepared reaction feed liquid (the feed liquid composition is an aqueous solution of 1.0mol / L nitric acid, 0.1mol / L hydrazine nitrate and 0.3mol / L hydroxylamine nitrate, saturated with tributyl phosphate n-dodecane at a volume ratio of 1:100 Equilibrium) into a 250mL three-neck flask, turn on the constant temperature magnetic stirring water bath and preheat it to 95°C, add 5.23g of 3# catalyst (dry product) at a stirring speed of 400rpm, and time the reaction until there are no more bubbles in the reaction system. Reaction, record the reaction time, and recover the catalyst by vacu...

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Abstract

The invention discloses a method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid, which comprises the following steps of: contacting feed liquid to be treated with a catalyst under a heating condition to catalyze and decompose hydrazine nitrate and hydroxylamine nitrate into nitrogen, hydrogen, water, trace nitric oxide, ammonium ions and the like, wherein the carrier of the catalyst is coconut shell active carbon-silicon oxide, the active component is ruthenium or a compound of ruthenium and platinum, and the mass fraction of the active component in the catalyst is 1-5%. The invention also discloses a preparation method of the catalyst. The prepared catalyst is high in decomposition activity of hydrazine nitrate and hydroxylamine nitrate, high in nitric acid corrosion resistance and long in service life, and the waste liquid treatment method is efficient, safe, economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of nuclear power waste treatment and environmental protection, and in particular relates to a method for removing hydrazine nitrate and hydroxylamine nitrate in nitric acid. Background technique [0002] Nuclear power is a green, low-carbon and clean energy with mature technology, and it is one of the most practical and feasible technical ways for human beings to solve energy problems. However, nuclear power produces a large amount of highly radioactive waste—spent fuel, and its safety is one of the main factors restricting the large-scale promotion and application of nuclear power. As we all know, the nuclear fuel utilization rate of nuclear power reactors is not high at present, and spent fuel contains a large amount of unconverted uranium and value-added nuclides, which are important nuclear element resource pools. Major nuclear power countries, including China, mostly adopt nuclear fuel closed cycle routes. Physi...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/72G21F9/20G21F9/06B01J23/46B01J33/00C02F101/16
Inventor 赵许群史海侯宝林周秀楠张旭邹展张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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