How to Calculate pH without a pH meter
Without a meter, acidity or alkalinity determinations of water for and solutions used in plants treating gold and silver ores are of importance. Methods range from simple tests with litmus papers or phenolphthale in solutions to pH determinations. pH Determination The pH value indicates with a high degree of accuracy the amount of active acidity […]
How to Sample Gold Ore
The value of any series of experiments depends entirely upon the kind of sample of ore provided for the test. It must represent, wholly and completely, the character of the material that will be treated in the plant to be designed and constructed. If it does not, the tests will be useless or, worse, misleading. In […]
Sampling Conveyor Belt for Crusher Circuit Survey
Let’s review the steps to collect a sample of coarse rocks such as primary Crusher product. The procedure requires that Process Equipment be shut down and so it is important to organize the work to minimize lost time. First the particular conveyor where the sample is to be collected is identified, next, one to two […]
Assaying for Cyanide
Methods for the analysis of cyanide silver-plating solutions were studied, including the determination of free cyanide, total cyanide, carbonate, chloride, ammonia, silver, iron, copper, and mercury. Electrometric titrations showed that the Liebig method for alkali cyanide is correct to better than 0.2 per cent. Addition of iodide makes the method still more accurate and overcomes […]
FREE Cyanide Assay Method
A simple example of the application of a complexation reaction to a titration procedure is the titration of cyanides with silver nitrate solution. When a solution of silver nitrate is added to a solution containing cyanide ions (e.g. an alkali cyanide) a white precipitate is formed when the two liquids first come into contact with […]
How to Collect a Sample for Cyanide Analysis
It is important to make use of composite sampling and to take at least five samples. Grab samples may be representative of flow during a short period and any other sample shown to be representative of waters being sampled may be applicable. The collection of samples for cyanide determination will require treatment to preserve the […]
Cyanide Assay Methods
Summary of CN Analysis Methods Description Name Method Description Potential Interferences Measurement Free Cyanide ASTM D 4282 Passive Diffusion at pH 6 and room temperature • Storage • Measurement • Manual chlorination of cyanide with chloramine-T and subsequent reaction with pyridine-barbituric acid. • Maximum absorbance is determined by manual colorimetry. ASTM D 7237 Flow Injection […]
Laboratory Flotation Cells
The 500, 1000, and 2000 gram Laboratory Flotation Cells have been proved by mining, chemical and government laboratories and schools all over the world, to produce reliable results which can be duplicated in actual milling installations because they incorporate all of the basic principles of the commercial size machines. The 50-gram unit is designed to complete this line of Batch Laboratory […]
Mineral Processing Pilot Plant Equipment
The testing of tonnage lots of ores and industrial materials by continuous Mineral Processing Pilot Plant operation is in many instances advisable before a full scale milling plant is installed. The treatment of complex ores by new processes or by the use of new or unusual reagents in flotation may involve problems the effect of […]
Metallurgical Laboratory Equipment & Test Methods
The Mineral Industries have for many years recognized the importance of small-scale ore dressing tests for determining the amenability of ores to various methods of concentration. The successful development of the flotation process, which was accomplished with the aid of small-scale laboratory machines, gave a decided impetus to the laboratory testing of ores. Today the […]