Patent ID: 7560093

Claim:
A process for preparing Zeolite-A from Kimberlite tailings, the process comprising: (i) treating sieved Kimberlite tailings fraction with a mineral acid to remove acid soluble impurities as filtrate and obtain an acid treated Kimbertlite tailings residue; (ii) washing the acid treated Kimberlite tailings residue with demineralized water until the residue is free from acid; (iii) digesting the acid treated Kimberlite tailing residue with an alkali to obtain sodium silicate; (iv) adding a caustic soda solution to the sodium silicate; (v) preparing a sodium aluminate solution by dissolving alumina trihydrate in a sodium hydroxide solution; (vi) removing insoluble impurities present in the sodium aluminate solution; (vii) dosing the sodium aluminate solution to the sodium silicate solution to form an amorphous aluminosilicate gel; (viii) heating the amorphous aluminosilicate gel to convert the amorphous aluminosilicate gel to crystalline Zeolite-A in a product slurry; (ix) cooling the product slurry and separating Zeolite-A as a wet cake from a filtrate; (x) washing the wet cake with demineralized water; (xi) drying the washed wet cake of the product; (xii) pulverizing the dried wet cake.