Study on fertilizer efficiency and its mechanism of urea and ammonium bicarbonate treated with controlled-release technology;

The incremental effect of rare earth ammonium bicarbonate was investigated by 15 N trace technique.

Under the condition of four successive plantations of leafy vegetables with the same amount of phosphorus and potassium,Urea,ammonium bicarbonate and their combined application with organic fertilizer experiment indicated that growth and yields of leafy vegetables in the urea treatment was better than those in ammonium bicarbonate treatment,but the difference declined with temperature decreasing.

Made from ammonium carbonate,gypsym and potassium chl oride, the potassium sulfate and ammonium chloride are empl oyed in high concentration compound fertilizer manufacture as raw materials.

A new process for producing high purity SiO_2 from fluosilicic acid and ammonium hydrocarbonate;

Preparation of cryolite with high molecule ratio from fluosilicic acid and ammonium hydrocarbonate;

First,brine is reacted with ammonium hydrocarbonate to obtain the sodium hydrocarbonate and the ammonium chloride solution,and then filtrated.

Phosphogypsum reacts with ammonium hydrocarbonate at 5-30℃ to obtain ammonium sulfate solution,then the solution reacts with potassium chloride at 30℃ with adding an organic solvent to produce potassium sulfate.

Discussion on drying process for ammonium bicarbonate;

Study on preparation of high purity manganese carbonate from manganese sulfate and ammonium bicarbonate;

Nitrification inhibition effect of dicyandiamide on ammonium bicarbonate in red soils with different textures;

Investigation on preparation of tribasic lead sulphate from bismuth hydrometallurgy waste residue——the influence of ammonium hydrogen carbonate transformation process;

YAlO3 ultra-fine powder synthesized by precipitation,with the ammonium hydrogen carbonate as precipitator,the metal nitrate as reaction material.

It is found that the concentration of nitric acid has great effect on reclaiming rate of lead in the processing of nitric acid leaching-lead deposition after investigating the preparation of tribasic lead sulphate from bismuth waste residue by ammonium hydrogen carbonate transformation method.