Comprehensive Utilization Method of Ammonium Chloride Wastewater
A technology for ammonium chloride and waste water, which is applied in the direction of chemical instruments and methods, metallurgical waste water treatment, water pollutants, etc., can solve the problems of high energy consumption and high treatment cost, and achieve the effect of reducing the cost of waste water treatment and shortening the time of waste water treatment
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[0024]
[0025] The ammonium chloride wastewater produced in the rare earth smelting process is formed into a mixed solution of hydrochloric acid and ammonium chloride. For example, ammonium chloride waste water, hydrochloric acid solution and optional water are mixed to obtain a mixed solution of hydrochloric acid-ammonium chloride. In the ammonium chloride wastewater produced in the rare earth smelting process, the concentration of ammonium chloride is generally 0.5 to 3.5 mol / L. The concentration of the hydrochloric acid solution is not particularly limited, for example, the concentration of HCl can be 15-37 wt %, including 37 wt % of concentrated hydrochloric acid. In certain embodiments, the ammonium chloride wastewater, the hydrochloric acid solution and the water are uniformly mixed to obtain a mixed solution of hydrochloric acid-ammonium chloride. In other embodiments, the ammonium chloride wastewater and the hydrochloric acid solution are mixed uniformly to obtain ...
Embodiment 1
[0066] The 3 mol / L ammonium chloride wastewater produced in the rare earth smelting process is mixed with concentrated hydrochloric acid and condensed water to obtain a mixed solution I of hydrochloric acid-ammonium chloride (HCl concentration is 0.75 mol / L, ammonium chloride concentration is 1.7 mol / L).
[0067] Mix 20 g of hydrochloric acid-ammonium chloride mixed solution I with 100 g of NdFeB magnet waste (particle size less than 120 μm) to obtain a solid-liquid mixture. 2 g of hydrogen peroxide was added to the solid-liquid mixture, and the reaction was carried out at 25° C. in an air atmosphere to form the first reactant. When the water content of the first reactant was 2.7 wt %, 40 g of condensed water was added to the first reactant, and the reaction was continued to form the second reactant. When the water content in the second reaction material was 3.2 wt %, 40 g of condensed water was added to the second reaction material to continue the reaction. By analogy, the...
Embodiment 2
[0071] The 3.5mol / L ammonium chloride wastewater produced in the rare earth smelting process is mixed with concentrated hydrochloric acid and condensed water to obtain a mixed solution I of hydrochloric acid-ammonium chloride (HCl concentration is 0.55mol / L, ammonium chloride concentration is 0.5 mol / L).
[0072] 25g of hydrochloric acid-ammonium chloride mixed solution I and 100g of NdFeB magnet waste (particle size less than 120 μm) were mixed uniformly to obtain a solid-liquid mixture. 3 g of hydrogen peroxide was added to the solid-liquid mixture, and an oxidation reaction was carried out at 40° C. in an air atmosphere to form a first reactant. When the water content of the first reactant is 3.5 wt %, 50 g of condensed water is added to the first reactant, and the reaction is continued to form the second reactant. When the water content in the second reactant was 2.8 wt %, 50 g of condensed water was added to the second reactant to continue the reaction. By analogy, the ...
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