There are two types of lime, high calcium and dolomitic lime. Typical analyses of these materials are shown in Table 1. This discussion is concerned only with high calcium lime. Lime is produced from naturally occurring limestone by subjecting the limestone to a temperature in the range of 2200°F for sufficient time to drive off … Read more
A horizontal ball mill can be used as in a lime slaking circuit just as well as a vertimill. Some operations apply the raw quicklime directly to the ore on the belt moving toward further crushing or grinding. In this application, it is necessary only to have a suitable lime storage tank with a live … Read more
Manufacture and mixing of flotation reagents at the mill site provides an economic and convenient method of maintaining a continuous and fresh supply of reagents for concentrator operations. Kennecott Copper Corporation has designed and built a Reagent Mixing Facility which incorporates new ideas in construction and fail-safe operation at its Nevada Mines Division concentrator. Reagents … Read more
In order to maximise the benefits obtained from flocculating agents when used as settling aids in high rate and conventional thickeners, it is often necessary to dilute the thickener feed prior to flocculant addition. In some cases, no flocculation at all is possible unless dilution water is used. The most common method of diluting thickener … Read more
Copper Activation Sphalerite & Xanthate: Unlike most other sulfide minerals, sphalerite responds poorly to short-chain thiol collectors. The problem is attributed to the high solubility of zinc-thiol compounds in water. Also, due to its large band gap (3.7 eV), sphalerite is a poor catalyst for mixed potential reactions between xanthate and oxygen. The reactivity of … Read more
It is common industrial practice to add polymeric flocculants directly into slurry streams during flow through pipes. However, very little information is available on the specific requirements for such polymer addition systems and their design and operation appear to be largely intuitive. In-Line Pipe Flocculant Mixer Test The flocculation tests were performed in a Kenics … Read more
Cyanide Training Proper care and handling of Sodium Cyanide Why the need for training? To help ensure that Team Members are not exposed to harmful concentrations of cyanide through proper handling procedures. To assist all Team Members in understanding how cyanide is used safely and the environment is protected. To ensure all Team Members are … Read more
Tests to study the effect of collectors and pH were randomly conducted on the phosphate matrix, using a 2k full factorial design for collector screening and process optimization. Star points needed to estimate non-linear factor responses were included in the optimization test series and in some reagent screening tests. For the fatty acids, the two … Read more
Some factors adversely affect the efficiency of anionic flotation of phosphate in the absence of sodium silicate, thereby decreasing the concentrate grade. Impurities originally present on the quartz surface might be responsible for this adverse effect, but the precipitates heterocoagulated onto the surface of quartz also appeared to play a role. Dissolved ions, especially Ca++, … Read more
The pilot mill used was 44 cm i.d. and 60 cm i.l. with a volume of 91,250 cm and was fitted with six one-half inch lifter bars. The ball charge was made up of 2,200 one-inch balls for a bulk volume of 36,500 cm³ (40% loading and a void volume of approximately 13,700 cm³ (38%). … Read more
