A microalgal flour comprising at least 10% by dry weight of lipids, the size of the flour particles being between 30 and 150 μm in diameter and said flour having a compressibility, measured on a HOSOKAWA powder tester, of between 45% and 55%, characterized in that it has: - a flow value, determined according to test A mentioned in the description, of between 55% and 60% by weight for the oversize at 2000 μm, - a dispersibility and a wettability, expressed, according to test B mentioned in the description, by: ▪ the height of the product decanted in a beaker, having a value of between 0 and 2 mm; ▪ a degree of wetting having a value of more than 70%, preferably more than 80% of the total powder, and in that it is prepared according to a process comprising the steps consisting of: 1) preparing an emulsion of lipid-rich microalgal flour in water with a solids content of between 15% and 50% by dry weight, the lipid-rich microalgal flour comprising at least 10% by dry weight of lipids, 2) introducing this emulsion into a high-pressure homogenizer, 3) spraying this emulsion in a flat-bottom spray dryer equipped with an air broom for sweeping the spray drying chamber with low-pressure air in its lower portion, while making adjustments to ensure that: a) the temperature of the main drying air is between 160 and 240°C, b) the temperature of the air in the air broom portion is at most 70°C, preferably at most 65°C, more preferably between 50 and 60°C, c) the ratio of the flow rate of the air from the air broom to the flow rate of the main drying air has a value greater than 1/3, preferably between 1/3 and 1/2, d) the temperature of the cooling air is between 25 and 35°C, such that the flour leaving the spray dryer has a temperature of between 60°C and 90°C, 4) collecting the microalgal flour thus obtained. - a flow value, determined according to test A mentioned in the description, of between 55% and 60% by weight for the oversize at 2000 μm, - a dispersibility and a wettability, expressed, according to test B mentioned in the description, by: ▪ the height of the product decanted in a beaker, having a value of between 0 and 2 mm; ▪ a degree of wetting having a value of more than 70%, preferably more than 80% of the total powder, and in that it is prepared according to a process comprising the steps consisting of: 1) preparing an emulsion of lipid-rich microalgal flour in water with a solids content of between 15% and 50% by dry weight, the lipid-rich microalgal flour comprising at least 10% by dry weight of lipids, 2) introducing this emulsion into a high-pressure homogenizer, 3) spraying this emulsion in a flat-bottom spray dryer equipped with an air broom for sweeping the spray drying chamber with low-pressure air in its lower portion, while making adjustments to ensure that: a) the temperature of the main drying air is between 160 and 240°C, b) the temperature of the air in the air broom portion is at most 70°C, preferably at most 65°C, more preferably between 50 and 60°C, c) the ratio of the flow rate of the air from the air broom to the flow rate of the main drying air has a value greater than 1/3, preferably between 1/3 and 1/2, d) the temperature of the cooling air is between 25 and 35°C, such that the flour leaving the spray dryer has a temperature of between 60°C and 90°C, 4) collecting the microalgal flour thus obtained. ▪ the height of the product decanted in a beaker, having a value of between 0 and 2 mm; ▪ a degree of wetting having a value of more than 70%, preferably more than 80% of the total powder, 1) preparing an emulsion of lipid-rich microalgal flour in water with a solids content of between 15% and 50% by dry weight, the lipid-rich microalgal flour comprising at least 10% by dry weight of lipids, 2) introducing this emulsion into a high-pressure homogenizer, 3) spraying this emulsion in a flat-bottom spray dryer equipped with an air broom for sweeping the spray drying chamber with low-pressure air in its lower portion, while making adjustments to ensure that: a) the temperature of the main drying air is between 160 and 240°C, b) the temperature of the air in the air broom portion is at most 70°C, preferably at most 65°C, more preferably between 50 and 60°C, c) the ratio of the flow rate of the air from the air broom to the flow rate of the main drying air has a value greater than 1/3, preferably between 1/3 and 1/2, d) the temperature of the cooling air is between 25 and 35°C, such that the flour leaving the spray dryer has a temperature of between 60°C and 90°C, a) the temperature of the main drying air is between 160 and 240°C, b) the temperature of the air in the air broom portion is at most 70°C, preferably at most 65°C, more preferably between 50 and 60°C, c) the ratio of the flow rate of the air from the air broom to the flow rate of the main drying air has a value greater than 1/3, preferably between 1/3 and 1/2, d) the temperature of the cooling air is between 25 and 35°C, such that the flour leaving the spray dryer has a temperature of between 60°C and 90°C, 4) collecting the microalgal flour thus obtained.