6 results about "Laterite" patented technology

The invention discloses sticky-rice mortar and a preparation method thereof. The sticky-rice mortar comprises, by weight, 15-30 parts of sticky-rice flour, 100-180 parts of calcium hydroxide powder, 200-300 parts of calcium carbonate granules, 20-30 parts of sand, 1-5 parts of cellulose, 15-25 parts of fine aggregate, 3-12 parts of pre-gelatinized sticky-rice flour, 0.8-1.6 parts of a water reducer, 75-150 parts of water, 5-12 parts of red soil, 10-15 parts of coal ash, 10-20 parts of modified metakaolin and 10-15 parts of modified clay. The sticky-rice mortar has the advantages of fast curingspeed, small shrinkage and high strength.

Methods of enhancing the segregation roast through the use of microwave radiation and chloride ions are disclosed. The processes provide means of recovering metals trapped in ores and slags by reaction of these materials with carbon, chloride and water using microwave radiation as the primary energy source. The metals may be present in starting materials such as metallic sulfides, slags, metallic oxides such as laterites, magnetites, iron oxides, silicates and carbonates. The metals are reduced and can be recovered by separation from the gangue. Water, carbon and chloride can be recycled to the reaction to reduce costs.

The invention discloses a roasting method for laterite-nickel ore pellets. The method comprises the steps that (1) during pellet preheating, the pellets are fed into preheating equipment for preheating, wherein the temperature of the pellets is lower than 400 DEG C after preheating; (2) during composite roasting with an indirect heating tank-type furnace, the preheated pellets are fed into the indirect heating tank-type furnace for composite roasting, wherein the roasting temperature is 900-1100 DEG C, and the roasting reaction time is 30-90min; and (3) during material discharge, high-temperature roasted pellets obtained through the tank-type furnace roasting are fed into a cooling tank with a water jacket under the tank-type furnace, then cooled till the temperature is lower than 200 DEGC and finally discharged from a discharging machine. The method disclosed by the invention has the beneficial effects that a pellet preheating-indirect heating roasting furnace composite roasting system is used, so a reaction atmosphere needed by composite roasting of laterite-nickel ore can be controlled effectively, residual heat is fully used, and a chlorinating agent is recycled. In this way,production cost can be reduced and the application prospect is broad.

The invention relates to a method for extracting iron from high-iron low-silicon type laterite ore. The method is characterized in that the laterite ore with the TFe content ranging from 40% to 50%, the SiO2 content being 0%-3% and the Al2O3 content being 8%-12% is placed into aqueous alkali, alkaline leaching reacting is carried out at 120 DEG C to 210 DEG C for 0.3 h to 6 h, reactants are filtered to obtain filter liquor and an alkaline leaching filter cake A, and the alkaline leaching filter cake A is iron ore concentrate with the TFe content ranging from 62% to 68%. The filter liquor B is fed into a recovery treatment system, and NaAlO2 in the alkaline leaching filter liquor is hydrolyzed to produce a by-product, namely Al(OH)3. By means of the method, effective separation of silicon, aluminum and iron is achieved, the grade of the iron ore concentrate is improved from 40%-50% to 62%-68%, meanwhile, the S content in the iron ore concentrate is smaller than 0.1%, and the SiO2 content and the Al2O3 content are both smaller than 1%, the content of impurities such as S, Si and Al entering a blast furnace is reduced, and the iron-making cost is reduced.

The invention provides a laterite-nickel-ore reduction and cooling method. The laterite-nickel-ore reduction and cooling method comprises the following steps that reduced products of laterite nickel ore pass through a vertical cooling furnace and conduct heat exchanging with nitrogen, and the reduced products are cooled; and the reduced products after being cooled are crushed, ore-grinded and magnetic-separated, and high-nickel concentrate is obtained. According to the laterite-nickel-ore reduction and cooling method, when reduction ore of the laterite nickel ore is taken out from a kiln, waste heat can be sufficiently utilized and recycled, water resources are saved, and the environment is protected; and iron grains are promoted to grow up in the cooling process, the ore-grinding cost is reduced, and the nickel recovery rate is improved.