The Density of Liquids and Solids
Density data may be used for obtaining relationships between density, chemical composition, thermal and mechanical treatments of materials, etc. This circular defines density and specific gravity, describes 11 methods (hydrostatic weighing, pycnometer, flotation, hydrometer, falling drop, balanced column, Boyle’s law. electromagnetic, elastic helix, ice calorimeter, and volumetric) for determinations of the densities of solids and […]
Laboratory Sieve Shaker
The Laboratory Sieve Shaker will quickly and efficiently size laboratory products, thus allowing the determination of various important treatment factors. Results of sizing tests and analyses of sized products will determine such important factors as the following: Size at which valuable mineral is freed from the gangue. Whether tailing losses occur in coarser or finer […]
Laboratory Disk Pulverizer – Bico
DISK PULVERIZER MODEL: Type UA, Braun (now BICO)- The Braun BICO Type UA Disk Pulverizer, while particularly adapted for metallurgical samples, is also rendering excellent service in industrial laboratories. Bearings: UA 55 and UA 56 babbitted bushings are removable and replaceable and can be rebabbitted in any convenient shop or new bearings may be obtained. The bearings are […]
Particle Size Analyze Sampling -Estimating Errors
The full story on uncertainties in particle size analysis is somewhat complex. Gy dealt with the stats issue in terms of particle numbers and the correlation between terms on the cumulative size distribution. However, when sampling in an unbiased from a lot, there are what can be called ‘coarse’ particles and ‘fines’. The split between […]
Gravity Borax Method GBM Mercury Free Gold Recovery
The Gravity-Borax Method GBM is still unknown to most Artisanal and small-scale gold miners (ASGMs) worldwide as most still use mercury to extract gold. “Whole-ore amalgamation” is a technique that requires the use of 10–25 g of mercury to produce 1 g of gold. Within the last eight years, it has become evident that this technique is more […]
Selecting or Choosing a Lab Flotation Machine Model
The model’s choice of a laboratory flotation machine depends on three things; What work you want to do with the machine Who you have to operate the machine How much you have to spend If its just for some ‘hot’ plant floats and some basic metallurgical testing onsite then my personal favorite is the old […]
Recovering Silver from Photographic Materials
The Dangers Of Nitric Acid Nitric acid can kill if swallowed! Nitric acid can be absorbed through the skin, causing nitric acid poisoning. WEAR RUBBER GLOVES! Always use nitric acid in a well-ventilated area. Do not breathe the fumes! Nitric acid can ruin your clothes and shoes. Always add nitric acid to water. Never add […]
Arsenic Determination/Assaying
An assay method to measure arsenic using a MHS-10 and AA200 and Mercury Hydride System. Sample Preparation -Sample Weights to be used: Heads…………….. 0.3 g Cu Con……………..0.1 g Zn Con……………..0.2 g Knelson…………….0.3 g Core…………………0.1 g STANDARD MP-1a ……………0.1 g Cu Con Check Sample………..0.1 g Weigh the samples into 250 ml low form beakers. Add 10 mL Acid […]
Sodium Borohydride Make-up
Sodium Borohydride Solution Make-up Weigh 5 g of Sodium Borohydride and 2.5 g of KOH into a glass funnel inserted into 250 mL volumetric flask. Add distilled water to rinse the Sodium Borohydride / KOH into the flask. (If you are making a 10 g batch, dissolve the reagents in a beaker prior to transferring […]
Gravimetric Factors
The factors used to convert metal assays to mineral assays in this MVT Mississippi Valley Type Deposits review is summarized below. The conversion factors are based on standard metal to mineral gravimetric factors with some minor adjustments to compensate for the interstitial iron contained in the sphalerite lattice. The measured value for interstitial or submicroscopic […]