| 摘要 |
<p>Process (1) for making iron sulphate comprising a first reactor (30) in which a starting solution containing sulphuric acid is supplied (11, 12) in a measured concentration. The starting solution is caused to react with iron scale put into the first reactor (30). At the end of the reaction an intermediate solution is obtained comprising iron sulphate and ferric sulphate that is supplied (12) in a second reactor (31) where it reacts with scrap iron in it present. Here, ferric sulphate developed in the intermediate solution reacts with the scrap iron and turns into iron sulphate whereby in the solution resulting the iron sulphate is the only iron based compound. From the reactor (31) the intermediate solution is then transferred (13, 41, 14) to a crystallizer (35) having a stirrer and connected (23) to a vacuum system (60). Once achieved the predetermined temperature, the final solution is given (15, 42, 16) to a centrifugal machine (36) in which the separation is obtained of the mother water from crystals of iron sulphate heptahydrate. The mother water is then sent (18) to a reservoir (37) and then cycled (20, 43, 21) upstream of the process (1) by a pump (43) [Figure 1].</p> |
