Patent for Enriching Bismuth from plant ash

Extracting iodine from laver in laboratory: baking laver into ash, soaking and dissolving to obtain laver ash suspension containing iodine ions. Adding acid and oxidant, enough dilute sulfuric acid and hydrogen peroxide to oxidize iodine ions into iodine, and filtering through operation ① to obtain insoluble residue, and the filtrate is iodine solution. Iodine is extracted by using organic solvent carbon tetrachloride, and then iodine is extracted by distillation.

(1) When roasting laver, put laver in the crucible, put the clay triangle on the iron shelf with iron ring, put the crucible on the clay triangle, and heat it with alcohol lamp. Therefore, the experimental instruments needed for roasting laver are crucible, iron shelf with iron ring, alcohol lamp and mud triangle.

Therefore: cdef；;

(2) filtering to separate solid and liquid; (3) extracting iodine from iodine water, and selecting a suitable extractant.

So, the answer is: filtering; Extract;

(3) Basic principle of extraction: The two solvents are immiscible with each other, and the solubility of solute in one solvent is much greater than that in the other, so carbon tetrachloride or benzene can be used.

So, the answer is: b; Iodine is much more soluble in benzene than in water, and benzene and water are immiscible.

(4) The conversion of iodine ions in algae ash into iodine organic solution requires liquid separation, and liquid separation requires a separating funnel and a conical flask.

So the answer is: separatory funnel; Conical bottle;

(5) Condensed water should flow in from bottom to top, the beaker should be heated by asbestos net, and the mercury ball of the thermometer should be flush with the mouth of the flask branch.

So, the answer is: mat asbestos net; The mercury ball of thermometer should be at the branch nozzle; The cooling water in the condenser pipe should enter the lower mouth and leave the upper mouth;

(6) The boiling point of carbon tetrachloride is 76.8℃, and the boiling point of iodine is 184℃, so the crystalline iodine finally gathers in the distillation bottle, so the answer is: distillation bottle.