The results of Tl adsorption by iron showed that the absorption of Tl by ferrous hydrate could be affected by pH of solution and the concentration of iron, especially the valence state of Tl. T1(I) can be absorbed by ferrous hydrate, especially in the Cl" solution, and the absorption rate is about 50%, but less than 20% in the SO42" solution.
Based on analysis of fundamental chemical principle of the separation and enrichment of silver from base metal,gold,matals of platium family,this paper made a review of the technique of reducing silver chloride by using hydrazine hydrate as well as formaldehyde ,zinc dust,iron powder and by smelting with sodium carbonate added. Besides,the comparisons among various reducing methods are made in this paper.
The surface modification product was tested and analyzed by SEM,TEM,XRD. The results show that hydrate titanium dioxide film on the ultra fine calcined coal kaolin is well distributed and compact,the thickness of film is about 150nm,the surface modification product is anatase crytal structure,which is very poor crystalline.
In an unlimited quantity of water, hydrate Ca(OH)_2+Fe_2O_3.aq+Al_2O_3.aq + SiO_2.aq of silicate cement can reduce greatly the flotability of pyrite. Among them, Ca(OH)_2 is a main component for depressing nickel-pyrite mineral.
Experimental results show that hydrate product of high water content material is mainly composed of ettringite and sodium nitrite plays a positive role in accelerating sulpholuminate cement hydration and in improving the pole structure of hardenite of high water content material, especially at 5 ℃.
Hydration mechanism of coal gangue grouting agent was analyzed in this paper,the results shown that the agent is composed of CSH gel,CH crystal,calcium aluminate hydrate and calcium aluminate sulfate hydrate. Meanwhile the grout also contained unhydrated activated mineral crystal,thus it can ensure the calculus strength had a tendency which continues to increase.
2,5-Bihydrazino-1,3,4-thiadiazole (2) was synthesized by condensation of 2,5-bimercapto-1,3,4-thiadiazole (1) with hydrazine hydrate, and compound 2 reacted with acyl chloride to give 2,5-biacylhydrazino-1,3,4-thiadiazole derivatives (3a-3e).
Gas hydrate is a recently-found new source of energy that mostly exists in marine sediments.
In recent years, we have conducted gas hydrate exploration in the South China Sea.
The Xisha trough, one of the promising target areas for gas hydrate, is located in the northern margin of the South China Sea, adjacent to several large oil and gas fields.
These geochemical anomalies are quite similar to those found in gas hydrate locations in the world such as the Blake Ridge and may be related to the formation and dissociation of gas hydrates.