Method for directly producing sodium stannate from flue dust and tin containing chemical engineering sludge

Abstract

The invention discloses a method for directly producing sodium stannate from flue dust and tin containing chemical engineering sludge. The method comprises the following steps that: (1) the flue dust is processed into a lumpy form block; (2) the form block and coke is smelted in a high-temperature furnace to prepare crude alloy; (3) the crude alloy is heated to a temperature of between 300 and 450 DEG C for separation in a high-temperature heating container so as to obtain high-temperature alloy and low-temperature alloy, the tin containing low-temperature alloy can flow out of the crude alloy at the temperature, and the high-temperature alloy cannot flow out because the melting point of the high-temperature alloy is not reached, so that the high-temperature alloy and the low-temperature alloy are separated; (4) the separated low-temperature alloy is reacted with sodium hydroxide and an oxidant in a reaction kettle at a temperature of between 300 and 550 DEG C to obtain crude sodium stannate; and (5) the crude sodium stannate is dissolved in water, and the obtained dissolving solution is refined and purified to obtain the finished product of the sodium stannate. The method is used for preparing sodium stannate product by abstracting tin from the flue dust and the tin containing chemical engineering sludge, thereby avoiding waste of resources and reducing environmental pollution.

Description

technical field [0001] The invention relates to a method for producing inorganic salts, in particular to a method for directly producing sodium stannate by utilizing flue dust and tin-containing chemical sludge. technical background [0002] At present, the production of sodium stannate at home and abroad is based on refined tin as raw material to produce tin salt, which is a kind of reverse processing. It must use tin concentrate to go through the processes of reduction refining and electrolytic refining, and then use the resulting refined tin to react with alkali in the presence of an oxidant to convert it into crude sodium stannate, and then go through processes such as leaching, impurity removal, concentration, and crystallization. To obtain sodium stannate, this production process makes energy and chemical materials waste due to the existence of reverse processing. At the same time, when using refined tin as a raw material to produce sodium stannate, because the melting...

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Problems solved by technology

Flue dust and tin-containing chemical sludge with a tin content of about 10% are still unusable. my country is a large producer and user of non-ferrous metals, and a large amount of tin-containing smoke is produced every year in production and use. If road ash and chemical sludge such as silver slag cannot be effectively utilized, it will not only waste a lot of precious resources but also cause environmental pollution

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