The application of zinc sulfate monohydrate industry grade in lead-zinc ore flotation

"Flotation" is an effective mineral separation technique according to the different physical and chemical qualities of mineral particle surface. In lead-zinc flotation, zinc sulphate is used as inhibitor. 
The principle of Lead-zinc flotation: 
Zinc sulfate is an inhibitor of sphalerite. Only under alkaline ore pulp condition, it can play its inhibition role. The inhibition role shows more obvious under higher pH of pulp. The inhibition effect for zinc sulfate alone is very poorer, and it’s often applied with cyanide, sodium sulfide, sulfite, thiosulfate and sodium carbonate together. This compound method can strengthen the inhibited effectiveness in sphalerite. The common proportion for cyanide and zinc sulphate is usually 1:2 to 1: 5.The process of mixed flotation: first use CH3CH2OCSSNa to float lead and zinc mineral out at one time; then use zinc sulfate and cyanide to inhibit zinc content and float out zinc and lead ore as for bulk concentrate.

Nowadays, many dressing plants widely apply zinc sulphate industry grade and cyanide as inhibitor to flotation lead-zinc deposit.

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Zinc sulfate monohydrate used as retarder in cement production

Cement, stired into paste, can be better hardened in air or water and firmly cemented sand, stone together. But if cement is solidified too fast, it needs to add zinc sulfate monohydrate retarder and adjust the production process.

In cement production field, Rech Chemical’s customers purchase a variety of retarders, which roughly divided into two types: organic and inorganic, including zinc sulfate.

Organic retarder is characterized by tiny dosage that improper dosage can affect cement strength; The inorganic salt retarder is characterized by slightly more than organic retarder and its different retarding effect. Take zinc salt for an example, zinc salt includes zinc chloride, zinc sulfate, zinc carbonate, zinc nitrate and so on. Zinc salt retarder cannot work much when used alone, so zinc salt is usually compounded with organic retarder, which can reduce reduce bleeding without affecting concrete strength in the early period.

Considering the prices and its active ingredients, zinc sulfate monohydrate has become the common retarder in cement manufacturing industry.

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