The method and device for treating the reaction residue of polyaluminum chloride, the reaction residue produced after the reaction of bauxite or calcium aluminate powder and hydrochloric acid to produce polyaluminum chloride, is added with water and then washed, and the water and the reaction residue form a suspension Turbid liquid; the suspension is sent to a filter press for filtration to obtain filter residue and filtrate, and the filtrate is combined into the finished product of polyaluminum chloride.The reaction residue treatment device has a slag washing pool (5) for receiving the reaction residue; a first mortar pump (6) connected to the slag washing pool (5) through a pipeline; at least one filter press (4); and The filter press (4) is connected to a filtrate tank (7) through a pipeline, and the slag washing tank (5) also has a flushing water pipe.After the reaction residue is washed and filtered again, the yield of polyaluminum chloride can be increased, and the amount of discharged residue can be reduced. The residue after treatment can be comprehensively utilized and harmlessly treated.
Method and device for treating reaction residue of polyaluminum chloride
technical field
The invention belongs to polyaluminum chloride production technical field, relate to a kind of polyaluminum chloride production waste processing method and device, especially relate to a kind of processing method and device of polyaluminum chloride reaction residue. Background technology
Background technique
After utilizing bauxite or utilizing calcium aluminate powder and acid solution to react to produce polyaluminum chloride, a large amount of residues produced are usually discarded or landfilled.Contain undissolved aluminum ion in the residue, acidity is stronger, and the pH value of waste residue raffinate is about 1, if directly discarded or landfill can cause the loss and the waste of polyaluminum chloride, and pollute the environment.
CN101905898A discloses a kind of processing utilization method of polyaluminum chloride reaction residue, and concrete steps are as follows:
(1) 4%～20% (in terms of HCl mass fraction) inorganic mixed acid and reaction residue are dropped into reaction equipment in mass ratio 1: 6～1: 2 and mix uniformly, and stirring reaction at 50～110 DEG C. .5～2 hours; (2) the reaction solution is squeezed into the sedimentation tank for 0.5～2 hours or directly carry out solid-liquid separation by pressure filter equipment, and the clear liquid obtained is the aluminum-containing acid solution, which can be returned to Used in the production of polyaluminum chloride.
CN101671047A discloses a kind of method that polyaluminum chloride residue is regenerated, comprises the following steps: A, bauxite or calcium aluminate powder and acid solution reaction produce the aluminum-containing residue produced after polyaluminum chloride, prepare 500 parts by weight of aluminum-containing residue and 10%-32% lye; B, stirring the 500 parts by weight of aluminum-containing residue, slowly adding the lye while stirring, so that the aluminum-containing residue is completely Soluble in lye, when the pH value reaches 9-10, stop adding and stop stirring to obtain an intermediate solution; C, pour the intermediate solution into the reaction tank, add aluminum-containing hydrochloric acid in the intermediate solution, and stir evenly to make When the pH value reaches 4-5, the liquid polyaluminum chloride can be obtained after standing still for 7-8 hours, and the reproduction is completed.
In the prior art, the utilization of polyaluminum chloride reaction residue mostly is to add acid or lye to carry out chemical reaction and comprehensive utilization, still has many waste residues to discharge, also makes production process complicated, and the cost of comprehensive utilization is relatively high high.
Contents of the invention
In order to overcome the defective of prior art, on the one hand, the technical problem to be solved in the present invention is: provide a kind of processing method of polyaluminum chloride reaction residue, can significantly reduce the discharge of waste residue, improve polyaluminum chloride harvest Rate.
In order to solve the problems of the technologies described above, the processing method of polyaluminum chloride reaction residue provided by the invention comprises the following steps: the reaction residue produced after bauxite or calcium aluminate powder and hydrochloric acid reaction produces polyaluminum chloride, Washing is carried out after adding water, and the water and the reaction residue form a suspension; the suspension is sent to a filter press for filtration to obtain a filter residue and a filtrate, and the filtrate is combined into a finished product of polyaluminum chloride.
Further, the processing method of described polyaluminum chloride reaction residue, after described suspension liquid and the material that reacted in polyaluminum chloride reactor mix, send to filter press to filter.
On the other hand, the present invention also provides a kind of device that polyaluminum chloride reaction residue is processed, makes residue can realize the comprehensive utilization of resource by physical treatment, reduces the discharge of waste residue, improves polyaluminum chloride harvest Rate.
In order to solve the problems of the technologies described above, the treatment device of polyaluminum chloride reaction residue provided by the invention, the basic technical scheme that takes is: a kind of treatment device of polyaluminum chloride reaction residue, to produce polyaluminum chloride through pressure The reaction residue filtered by the filter is processed, and there is a slag washing tank for receiving the reaction residue; a first mortar pump connected to the slag washing tank through a pipeline; at least one filter press; and the filter press through a pipeline The connected filtrate tank, the slag washing tank also has a flushing water pipe.
Further, the outlet of the first mortar pump of the treatment device of polyaluminum chloride reaction residue also has the return pipe flowing to the slag washing tank.
Further, the processing device of polyaluminum chloride reaction residue also has the intermediate pool that receives polyaluminum chloride reactor and described first mortar pump outlet pipeline outflow material; By the bottom of pipeline and described intermediate pool and the The feed port of the filter press is connected, and the material in the intermediate tank is pumped to the second mortar pump of the filter press.The suspension formed by the reacted material in the polyaluminum chloride reactor and the reaction residue and water can be pumped to the filter press by the second mortar pump alone or after being mixed in the intermediate tank.
Further, the outlet of the second mortar pump of the processing unit of polyaluminum chloride reaction residue also has the return pipe flowing to the intermediate tank.
Further, the inlet of the first mortar pump of the treatment device of polyaluminum chloride reaction residue is also connected with the bottom of described filtrate tank by pipeline, the residue that settles in filtrate tank is pumped to described intermediate pond or washing slag pool.
Further, the outlet of the first mortar pump of the processing unit of polyaluminum chloride reaction residue is also connected with the feed inlet of described filter press by pipeline.
Further, the bottom of the pool of the slag-washing pond of the treatment device of polyaluminum chloride reaction residue is slope, and the slope is towards the liquid inlet nozzle of the first mortar pump.
[0017] In the absence of conflict, the aforementioned improvements or preferred solutions can be implemented individually or in combination.
The beneficial effect that the present invention brings: through the polyaluminum chloride reaction residue after filter press filter, after washing and filtering again, can improve polyaluminum chloride harvest rate about 10%, reduce efflux residue amount, through The aluminum and acidic substances in the treated residue are greatly reduced, the waste residue is close to neutral, and its pH value is increased to above 6, which can meet the raw material requirements for the production of ceramics, and achieve comprehensive utilization and harmless treatment of the residue.Lower cost during production
