Method for producing barium sulfate from combination-process industrial ammonium chloride solid waste

Abstract

The invention relates to a method for producing barium sulfate from combination-process industrial ammonium chloride solid waste. The method comprises the following steps: (1) stirring and washing the combination-process industrial ammonium chloride solid waste, namely barium sulfate mud and a dilute hydrochloric acid solution in a pickling tank, then filter-pressing, and feeding filtrate to an industrial ammonium chloride production system to prepare a barium chloride solution when filtrate is recycled to be neutral, wherein the hydrochloric acid concentration is smaller than or equal to 25%; (2) stirring and washing a filter cake in the step (1) and process water in a rinsing bath, then filter-pressing, and feeding filtrate to the pickling tank to wash the barium sulfate mud when the filtrate is recycled to weak acidity; (3) drying and crushing the filter cake in the step (2), so as to obtain a precipitated barium sulfate product. By adopting the method, barium resources can be fully utilized; precipitated barium sulfate is produced in an attached manner; the economic benefits of an enterprise are improved; meanwhile, the solid waste barium sulfate mud in combination-process industrial ammonium chloride production can be thoroughly removed; a hidden danger of environmental pollution is also removed.

Description

technical field [0001] The invention relates to the technical field of refined ammonium (industrial ammonium chloride) solid waste treatment, in particular to a method for producing barium sulfate by using combined refined ammonium solid waste. Background technique [0002] The new process of combined method of refined ammonium is to produce industrial ammonium chloride (refined ammonium) by two-stage washing method. The first stage is mixed washing, that is, the mixed washing of agricultural ammonium chloride and ammonia mother liquor Ⅰ in the production of combined alkali; the second stage is Circulation washing, that is, washing with circulating mother liquor, in order to reduce the sulfate radical (SO 4 2- ), constantly adding BaCl configured in the circulating mother liquor 2 The solution generates barium sulfate precipitation to remove the sulfate radical in the circulating mother liquor. Carbonate (CO 3 2- ), adding BaCl 2 After the solution, barium carbonate pr...

AI Technical Summary

Problems solved by technology

At present, there are two ways to deal with the combined refined ammonium solid waste - barium sulfate mud: one is to dig pits and bury them in remote places. Under acidic conditions such as acid rain, barium sulfate mud will produce a large amount of highly toxic heavy metal barium ions (Ba 2+ ), pollute the surface water, and pollute the environment; the second is to backfill the waste salt wells in the water mining area of ​​the company's salt factory, resulting in a waste of barium resources

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