CN1318649A

CN1318649A - Stirring lixiviation and backflash process of ionic rare earth

Info

Publication number: CN1318649A
Application number: CN00126904A
Authority: CN
Inventors: 陈景河; 黄毓咸; 曾宪辉; 邹来昌; 张岳
Original assignee: Fujian Zijin Mining Industry Co Ltd
Current assignee: Zijin Mining Group Co Ltd
Priority date: 2000-08-31
Filing date: 2000-08-31
Publication date: 2001-10-24

Abstract

The present invention relates to the extraction process of rare earth mineral. Ore pulp after stirring lixiviation is backflashed to separate mother liquor and bottom stream, and mother liquor stream to liquid pond for impurity eliminating precipitation, the bottom stream is solidified in tail ore bank before backfilling to soil, the leachate after impurity eliminating precipitation returns to lixiviation for reuse, and the precipitate is roasted to obtain rare earth oxide. The present invention has high yield, low cost, short lixiviation period and zero discharge, and is especially suitable for ore incapable of being in-situ lixiviated.

Description

Stirring lixiviation and backflash process of ionic rare earth

The present invention relates to a kind of extraction process of rare-earth mineral, particularly a kind of stirring lixiviation and backflash process of ionic rare earth.

Traditional rare-earth mineral extraction process be adopt the original place soak the ore deposit or the pond soak → sedimentation → removal of impurities → precipitation → roasting gets rare earth oxide.The original place deposit impregnating technology can't adapt to the extraction of composing the ion adsorption type re of depositing in the middle particulate granite of high loam mould, perviousness extreme difference, its yield and the rate of recovery are low, the production cycle is long and cost is high, easily cause ore body distortion or subside, problems such as landslide, acidification; Though soak in the pond can improve yield and the rate of recovery, shorten the production cycle, but still not ideal enough, also there are problems such as production cost height, severe water and soil erosion, environmental pollution are big simultaneously.

For addressing these problems, common way is to seek the best ore deposit agent of soaking to take different fluid injections and receive the liquid measure with precipitation agent or according to different technology types, as " in-situ ionic rare earth deposit impregnating technologies " of " ion type rareearth ore soaks impurity-removing precipitating process " of Chinese patent application 1110328 bulletin and 1208080 bulletins all is not change change additive kind and proportioning under the prerequisite of conventional process flow or adopting the different ore deposit technical schemes of soaking, failing to tackle the problem at its root.

Task of the present invention provide a kind of with short production cycle, cost is low, pollution-free, yield and the high stirring lixiviation and backflash process of ionic rare earth of the rate of recovery.

For finishing this task, the present invention carries out in the following way:

Pouring the screening ore deposit into leach the pond agitation leach ore pulp flows into the dense unit with washing and depositing effect and carries out countercurrent washing step by step, the mother liquor of its overflow oppositely carries out impurity-removing precipitating from flowing to liquid storage tank, underflow then positive flow to mine tailing storehouse after fixing backfill fertile soil, and the leach liquor that impurity-removing precipitating is separated out returns that to leach the pond multiplexing, the rare earth oxide product that throw out waters qualifiedly through roasting.

Dense unit is combined by two to four thickeners, the ore pulp forward washs step by step through the 1st thickener to the most last 1 thickener, settled underflow is from flowing to the mine tailing storehouse, and the mother liquor of overflow then oppositely flow to overflow liquid storage tank behind the 1st thickener from the last thickener by platform.

The mother liquor of overflow adds flocculation agent acceleration purification and impurity removal and carries out precipitation process again after a removal of impurities in liquid storage tank.

The present invention comes the ore pulp of agitation leach is carried out countercurrent washing because of the dense unit of employing, thus promptly shortened the production cycle, and the utmost point adapts to the ore body that can't adopt the original place deposit impregnating technology; Because leaching of the present invention, washing, removal of impurities, precipitation operation are gravity flow, leach liquor is reusable edible also again, so ore dressing yield and rate of recovery height, production cost are low; In addition because building the mine tailing storehouse by laying bricks or stones carries out recycling water utilization and uses in the solidifying agent and solidify underflow and give and building up fields, so can realize the requirement of the closed circuit flow process of cleaner production of zero release.

Detail of the present invention is provided by following embodiment and accompanying drawing thereof.

Fig. 1 adopts various processes to select the correlation parameter contrast table of smelting.

Fig. 2 is the stirring lixiviation and backflash process of ionic rare earth schema that proposes according to the present invention.

Fig. 3 is the synoptic diagram that dense unit carries out countercurrent washing in the technical process shown in Figure 2.

Below in conjunction with accompanying drawing the present invention is done to explain in detail further:

In the example table of circle 1, experimental example one is the original place deposit impregnating technology, and experimental example two is a leaching process, and experimental example three all is a stirring lixiviation and backflash process with experimental example four.During experiment, adopting grade is 0.88 ‰ ion adsorption type raw ore and the conventional ore deposit agent ammoniumsulphate soln that soaks, impurity-removing precipitating agent bicarbonate of ammonia, and be adjusted to identical P H value with conditioning agent sulfuric acid and carry out respectively.With each correlation parameter that experiment draws, experimental example three, four except that each additive amount a little more than the experimental example one, two, its leaching yield, washing rate and selecting and smelting recovery rate all improve significantly, especially the time of Jin Chuing foreshortens to 1/12 hour.Referring to Fig. 2, ion type rareearth raw ore [1] is transported to crude ore bin through the round sieve screening [2] of shaking, waste residue on the sieve [3] discards, undersized screening ore deposit [4] adds ammoniumsulphate soln and carries out agitation leach [5] after entering leaching vat, the ore pulp [6] that leaches flow to the thickener group certainly and carries out countercurrent washing [7], sedimentary underflow [8] flows to the mine tailing storehouse and neutralizes to solidify and build up fields, the mother liquor of discharge [9] is then when flowing to liquid storage tank and carry out impurity-removing precipitating [10], after the flocculation agent of adding 5% bicarbonate of ammonia removal of impurities earlier and interpolation trace quickens purification and impurity removal, add 10% bicarbonate of ammonia again and precipitate, throw out [11] is through centrifuge dewatering, carry out roasting [12] after the oven dry and obtain qualified rare earth oxide product [13].The available sulfuric acid of the leach liquor [14] that impurity-removing precipitating [10] is separated out is regulated pH value and is back to the recycling of leaching pond.It is definite that the number of leaching pond and liquid storage tank is looked the turnout size, in order to recycling continuously.As shown in Figure 3, one-level ore pulp [16] the inflow thickener B that ore pulp [6] flows into thickener A washing and depositing carries out the secondary washing and depositing, the underflow [8] that carries out according to this behind what washing and depositing flows to the mine tailing storehouse, and the washings [15] that overflows from last thickener step by step reverse direction flow flow into liquid storage tank to the mother liquor [9] that forms overflow to thickener A and carry out removal of impurities sedimentation [10].Dense unit is made up of two to four thickeners, and clearly distributing mother liquor [9] with washing and depositing is best platform number with underflow [8]

Claims

1, stirring lixiviation and backflash process of ionic rare earth, it comprises that screening ore deposit [4] are poured into the leaching pond gets rare earth oxide product [13] through agitation leach [5], impurity-removing precipitating [10], roasting [12] operation, the dense unit of ore pulp [6] inflow that it is characterized in that agitation leach [5] carries out countercurrent washing [7], the mother liquor of its overflow [9] flows automatically to liquid storage tank impurity-removing precipitating [10], and underflow [8] then flow to the mine tailing storehouse; Leaching the pond through leach liquor [14] backflow of impurity-removing precipitating [10] recycles.

2, stirring lixiviation and backflash process of ionic rare earth according to claim 1, the dense unit that it is characterized in that countercurrent washing [7] is made up of two to four thickeners, ore pulp [6] flow to the mine tailing storehouse through the underflow [8] of the 1st thickener to the most last 1 thickener washing and depositing, and mother liquor [9] then flows into liquid storage tank behind 1 overflow machine of overflow to the step by step from the most last 1 thickener.

3, stirring lixiviation and backflash process of ionic rare earth according to claim 1 and 2 is characterized in that mother liquor [9] in the liquid storage tank adds flocculation agent and carries out the secondary-cleaned removal of impurities and carry out precipitation process again after a removal of impurities.