CN-117836045-B - Equipment for improving underflow solid-liquid ratio of thickener

CN117836045BCN 117836045 BCN117836045 BCN 117836045BCN-117836045-B

Abstract

The invention relates to equipment for improving the underflow solid-liquid ratio of a thickener, which comprises an outer cylinder, a centrifugal component and a backflow component, wherein the centrifugal component comprises an inner cylinder, a screen and a driving piece, the inner cylinder is arranged in the outer cylinder and is in rotary connection with the outer cylinder, the screen cloth is arranged at an opening formed on the outer wall of the inner cylinder, a feed inlet communicated with the underflow of an upper-stage thickener and the overflow of a lower-stage thickener is formed at the top of the inner cylinder, a discharge outlet is formed at the bottom of the inner cylinder, an overflow outlet is formed at the outer wall of the inner cylinder above the screen, the driving piece is arranged on the outer cylinder, the output end of the driving piece is connected with the inner cylinder, and the backflow component is communicated with a gap between the outer cylinder and the inner cylinder.

Inventors

XU KAIHUA
OuYang Chongming
ZHANG KUN
PENG YAGUANG
JIN GUOQUAN
LIU WENZE
XU PENGYUN

Assignees

青美邦新能源材料有限公司
格林美股份有限公司
格林美(印尼)新能源材料有限公司

Dates

Publication Date: 20260512
Application Date: 20231129

Claims (10)

1. The equipment for improving the underflow solid-liquid ratio of the thickener is characterized by comprising an outer barrel, a centrifugal assembly and a reflux assembly; The centrifugal component comprises an inner cylinder, a screen and a driving piece, wherein the inner cylinder is arranged in the outer cylinder and is rotationally connected with the outer cylinder, the screen cloth is arranged at an opening formed on the outer wall of the inner cylinder, a feeding hole communicated with the underflow of an upper-level thickener and the overflow of a lower-level thickener is formed at the top of the inner cylinder, a discharging hole is formed at the bottom of the inner cylinder, an overflow hole is formed in the outer wall of the inner cylinder above the screen, the driving piece is mounted on the outer cylinder, and the output end of the driving piece is connected with the inner cylinder and is used for driving the inner cylinder to rotate; The backflow component is communicated with the gap between the outer cylinder and the inner cylinder and is used for sucking fluid in the gap between the outer cylinder and the inner cylinder into the upper-level thickener.
2. The apparatus for increasing the underflow solid to liquid ratio of a thickener according to claim 1, wherein the number of openings at the side wall of the inner cylinder is plural, the plural openings are uniformly arranged in the circumferential direction of the inner cylinder, the number of the screens is plural, and the plural screens are respectively arranged in the plural openings of the inner cylinder.
3. The apparatus for increasing the underflow solid to liquid ratio of a thickener according to claim 1, further comprising an annular slider, wherein the bottom of the annular slider is fixedly connected to the inner cylinder, wherein the top of the annular slider extends to the outside of the outer cylinder and is connected to the output end of the driving member, and wherein the annular slider is rotatably and sealingly connected to the outer cylinder.
4. The apparatus for increasing the solids to liquid ratio of a thickener underflow according to claim 1 further comprising a feed pipe and a discharge pipe, wherein one end of the feed pipe is connected to the upper thickener underflow and the lower thickener overflow, the other end of the feed pipe is connected to the inlet of the inner cylinder, and a valve is mounted on the discharge pipe.
5. The apparatus for increasing the solids to liquid ratio of a thickener underflow of claim 4 further comprising an upper underflow pipe and a lower overflow pipe, said feed pipe having a top end closed, a bottom end of said feed pipe communicating with a feed inlet of said inner drum, one side of said feed pipe communicating with an upper thickener underflow through said upper underflow pipe, and the other side of said feed pipe communicating with a lower thickener overflow through said lower overflow pipe.
6. The apparatus for increasing the underflow solid-to-liquid ratio of a thickener according to claim 1, wherein said driving member comprises a motor, a shaft, a gear and an annular rack, said motor is mounted on the top of said outer cylinder, the output end of said motor is connected with said shaft, said rack is provided on said shaft, said annular rack is fixedly connected with said inner cylinder, and said gear is engaged with said annular rack.
7. The apparatus for increasing the underflow solid to liquid ratio of a thickener of claim 4 further comprising a baffle disposed within said inner barrel at a location between said screen and said overflow port, said feed pipe extending into said inner barrel, said baffle being fixedly connected to said feed pipe, said baffle defining an overflow gap with the inner wall of said inner barrel.
8. The apparatus for increasing the solids to liquid ratio of a thickener underflow of claim 7 wherein a plurality of through holes are formed in said partition wall.
9. The apparatus for increasing underflow solid-to-liquid ratio of a thickener according to claim 4, further comprising a plurality of layered plates provided at positions facing said screen and sequentially arranged on said feed pipe in a direction of extension of said feed pipe, a flow guiding gap being formed between a plurality of said layered plates and said screen, a plurality of inclined hole groups facing a plurality of said layered plates being provided at a side wall of said feed pipe, said plurality of inclined hole groups being in one-to-one correspondence with a plurality of said layered plates, said inclined hole groups being provided at upper positions of said layered plates, said inclined hole groups comprising a plurality of inclined holes uniformly arranged along a circumferential direction of said feed pipe and pointing downward in an inclination direction of said corresponding layered plates.
10. The apparatus for increasing the underflow solid to liquid ratio of a thickener according to claim 1, wherein said return assembly comprises a return pipe and a return pump, one end of said return pipe being in communication with the gap between said outer cylinder and said inner cylinder, the other end of said return pipe being in communication with the upper thickener via said return pump.

Description

Equipment for improving underflow solid-liquid ratio of thickener Technical Field The invention relates to the technical field of thickeners, in particular to equipment for improving the underflow solid-liquid ratio of a thickener. Background With the gradual exhaustion of the current nickel sulfide ore resources, people gradually transfer the eyes to the nickel oxide ore, and the method for exploiting the nickel oxide ore mainly comprises reduction roasting, normal pressure ammonia leaching, sulfuric acid high pressure leaching and the like. The sulfuric acid high-pressure leaching has the advantages of high recovery rate, low energy consumption and environmental friendliness, and has become a mainstream process for treating laterite-nickel ores. The sulfuric acid high-pressure leaching process mainly comprises raw ore washing, pressure leaching, ore pulp neutralization, countercurrent washing, leaching liquid impurity removal, nickel cobalt precipitation and the like. Since valuable metals are very likely to be lost in the CCD countercurrent washing step, and the direct yield of valuable metals is lowered, it is an important study task to improve the CCD countercurrent washing efficiency in the sulfuric acid high-pressure leaching process. In order to ensure the direct yield of valuable metals, methods of increasing the stage number of a thickener, increasing the washing water ratio, improving a flocculating agent and the like are generally adopted. These methods can all improve the efficiency of countercurrent washing, but each has certain limitations. Specifically, increasing the thickener stage number can occupy a large amount of land and increase initial investment cost, increasing the washing water ratio can cause the metal content of the autoclave leaching liquid to be reduced, which is unfavorable for the sedimentation of the rear-end working procedure, and improving the flocculant can increase auxiliary material cost. Therefore, further research and development of an efficient solid-liquid separation method is required to improve the settling efficiency of a thickener, reduce the production cost, simplify the operation steps, and improve the solid-liquid separation effect. The method has important influence on the working efficiency of the back-end nickel-cobalt deposition process, the control of the auxiliary material cost and the product quality. Disclosure of Invention In view of the above, it is desirable to provide an apparatus for increasing the solids to liquid ratio of a thickener underflow to solve the problem of how to increase the solids to liquid ratio of the thickener underflow. The invention provides equipment for improving the underflow solid-liquid ratio of a thickener, which comprises an outer cylinder, a centrifugal component and a backflow component, wherein the centrifugal component comprises an inner cylinder, a screen and a driving piece, the inner cylinder is arranged in the outer cylinder and is in rotary connection with the outer cylinder, the screen is arranged at an opening formed on the outer wall of the inner cylinder, a feed inlet communicated with overflow of an upper-stage thickener underflow and a lower-stage thickener is formed at the top of the inner cylinder, a discharge outlet is formed at the bottom of the inner cylinder, an overflow outlet is formed at the outer wall of the inner cylinder above the screen, the driving piece is arranged on the outer cylinder, the output end of the driving piece is connected with the inner cylinder and is used for driving the inner cylinder to rotate, and the backflow component is communicated with a gap between the outer cylinder and the inner cylinder and is used for sucking fluid in the gap between the outer cylinder and the inner cylinder into the upper-stage thickener. Further, the number of the openings at the side wall of the inner cylinder is a plurality, the openings are uniformly distributed along the circumferential direction of the inner cylinder, the number of the screens is a plurality, and the screens are respectively distributed in the openings of the inner cylinder. Further, the device also comprises an annular sliding block, wherein the bottom of the annular sliding block is fixedly connected with the inner cylinder, the top of the annular sliding block extends to the outside of the outer cylinder and is connected with the output end of the driving piece, and the annular sliding block is rotationally and hermetically connected with the outer cylinder. Further, the device also comprises a feeding pipe and a discharging pipe, wherein one end of the feeding pipe is communicated with the bottom flow of the upper-stage thickener and the overflow of the lower-stage thickener, the other end of the feeding pipe is communicated with the feeding hole of the inner cylinder, and a valve is arranged on the discharging pipe. Further, the device also comprises an upper-stage underflow pipe and a lower-stage overflow pipe, th