1. The gold recovery of calcine cyanidation reached 90 percent.

2. Experimental study on the process cyanidation adding CaO_2 was carried based on the characteristics of gold oxide ore of Huangshilao Gold Mine.

3. Experimental study on cyanidation for recovering gold and silver from a bearing - copper gold concentrate is conducted.

4. The second was that cyanidation after alkali leaching was followed by flotation of cyanide residue.

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5. The polysulfide solution is one of non cyanidation systems of gold leaching in which polysulfide ions are the main effective components.

6. This paper dominantly made a description on the experimental study of gold extraction from gold-bearing roasted ores after mercury-smelting by all- sliming cyanidation CIP process.

7. Leaching of gold is a nwe method for non - cyanidation leaching gold.

8. It is found that the dispersing, impurity removal and chelating effect of acid help gold cyanidation.

9. The gold concentrates are pretreated by alkaline hot press oxidation followed by flash cyanidation in autoclave.

10. Two groups of hydraulic cyclones in series were successfully applied to the classing after grinding and thickening pulp before cyanidation in Yu' erya CIP plant.

11. A new technology applied to gold concentrates containing arsenic and sulphur fixing of roasting - cyanidation was studied.

12. Method 1,3,5-trimethylbenzene was selected as the start material. The final product was obtained in five steps, including two steps bromination, cyanidation, methylation and N-alkylation.

13. A new method of handling cyanide wastewater produced in roasting - cyanidation process was proposed in the paper.

14. The preparation of dimethyl malonate was studied acid , methanol and sodium cyanide by cyanidation and esterification.