Method for joint production of strontium nitrate and barium nitrate from high-calcium strontianite and witherite

Abstract

The invention discloses a method for joint production of strontium nitrate and barium nitrate from high-calcium strontianite and witherite. The method comprises the following steps: respectively crushing high-calcium strontianite and witherite, mixing with water to obtain strontianite pulp and witherite pulp, subsequently adding nitric acid into the strontianite pulp, reacting, filtering to obtain a nitrate solution and strontium sulfate filter residue, adding hydrogen peroxide and activated carbon into the nitrate solution to react and decontaminate, subsequently evaporating to crystallize the decontaminated nitrate solution, centrifuging to obtain strontium nitrate and a mother liquid containing calcium nitrate, adding the witherite pulp into the mother liquid, reacting and filtering to obtain a solution with barium nitrate and calcium carbonate filter residue, removing the nitrate solution from the solution with barium nitrate, adding hydrogen peroxide and activated carbon for reaction and decontamination, and subsequently evaporating to crystallize the decontaminated barium nitrate solution to obtain barium nitrate and a mother liquid which mainly contains strontium nitrate. The method adopts high-calcium strontianite and witherite for joint production of strontium nitrate and barium nitrate, the raw materials are low in cost, the materials can be recycled, and thus environment pollution is avoided.

Description

technical field

[0001] The invention belongs to the field of strontium-barium salt synthesis, relates to a method for producing strontium nitrate and barium nitrate, in particular to a method for jointly producing strontium nitrate and barium nitrate by using high-calcium strontite and witherite. Background technique

[0002] Strontium nitrate and barium nitrate are widely used in analytical reagents, electronic component materials, fireworks and medicine. At present, the production of strontium nitrate and barium nitrate mainly has the following two processes:

[0003] (1) Carbonate method: After mixing industrial strontium carbonate or industrial barium carbonate, add concentrated nitric acid to react to obtain the corresponding nitrate raw material solution, and obtain strontium nitrate and barium nitrate after impurity removal, filtration, evaporation and crystallization, and drying Product: The quality of strontium nitrate and barium nitrate obtained by this method is b...

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